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<html>
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<head><title>Vitamin E: Estrogen antagonist, energy promoter, and anti-inflammatory</title></head>
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<body>
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<h1>
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Vitamin E: Estrogen antagonist, energy promoter, and anti-inflammatory
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</h1>
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<em><p>
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Vitamin E, like progesterone and aspirin, acts within the cellular regulatory systems, to prevent
|
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inflammation and inappropriate excitation. Since uncontrolled excitation causes destructive oxidations,
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these substances prevent those forms of oxidation.
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</p>
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<p>
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Molecules that can easily be oxidized and reduced can function as antioxidants, and vitamin E does
|
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function as that kind of antioxidant in many chemical environments. But it is highly misleading to
|
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consider that as the explanation for its many beneficial biological effects. That kind of reasoning
|
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contributed to the use of the antioxidant carcinogens BHT and BHA as food additives and "antiaging"
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supplements, and many other chemicals are being promoted on the basis of their abstract antioxidant
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function.
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</p>
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<p>
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Becoming aware of the real value of vitamin E will have far reaching implications in nutrition and
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medicine.
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</p>
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<p>
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In determining criminal or civil legal responsibility, the concept "should have known" is recognized and
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used. In science, which is all about knowing, there is certainly a responsibility to be informed when
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the subject involves the life and health of millions of people. The science establishment of government
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and industry should be held responsible for the information it hides, destroys, or ignores for its own
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benefit. The US government has an agency for prosecuting research fraud, but the concept is applied so
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narrowly as to be meaningless, when deception has become the rule. And since it controls the court
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system, govenment agencies and their functionaries won't be prosecuted, even when their crimes become
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well known.
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</p>
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<p>
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"Vitamin E was advocated as an effective treatment for heart disease by Dr. Ev<em>an Shute of London,
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Ontario more than 50 years ago.</em>
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<em> </em>
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<em>His pioneering claims, which were unacceptable to the medical community at large, have been
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confirmed by recent findings from epidemiologic studies and clinical trials.</em>
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<em>" </em>
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</p></em>
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<hr />
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<p>
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Political scientists have recognized the process in which big corporations "capture" the governmental
|
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agencies that were created to regulate them. The editorial boards of professional journals can be captured
|
||||
even more cheaply than the agencies of government, and their influence can be even more valuable to
|
||||
industry.
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</p>
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<p>
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If science impinges upon the plans of an industry, it can be managed into compliance, when the industry
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controls the journals and the agencies that fund research.
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</p>
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<p>
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In the 1940s, it had already become clear to the estrogen industry that vitamin E research was impinging on
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its vital interests.
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</p>
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<p>
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The Manhattan Project, that created the atomic bomb, also created a generation of scientific and
|
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bureaucratic zealots who ignored public health and safety to advance their projects and their careers, and
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changed the way science was done. At exactly the same time, the pharmaceutical industry was using its
|
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financial and political power to change the way medicine was practiced and taught, and the consequences for
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world health rivalled those of the nuclear industry.
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</p>
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<p>
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In 1933 the physician R.J. Shute was aware of the problems associated with toxemia of pregnancy or
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preeclampsia. Especially among poorly nourished women, many pregnancies were complicated by circulatory
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problems, including cyclic bleeding, thrombosis, stroke, and hypertension, and these difficult pregnancies
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often ended in miscarriage or premature delivery, resulting in many serious health problems among the babies
|
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that survived.
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</p>
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<p>
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At that time, both estrogen and vitamin E were being widely studied, though the exact structure of the
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tocopherol molecule wasn't defined until 1936-37. Vitamin E had been found to improve fertility of both male
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and female animals, and to prevent intrauterine death of the embryo or fetus, so it was called the
|
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"antisterility vitamin." Using it to prevent women from having miscarriages must have occurred to many
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people.
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</p>
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<p>
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Animal research in the 1930s was also showing that estrogen had many toxic effects, including causing
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infertility or intrauterine death, connective tissue abnormalities, and excessive blood clotting. Dr. Shute
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and his sons, Wilfred and Evan, were among those who considered vitamin E to be an antiestrogen. They found
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that it was very effective in preventing the clotting diseases of pregnancy.
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</p>
|
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<p>
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Other researchers, who knew that progesterone protected against the toxic effects of estrogen, described
|
||||
vitamin E as the "progesterone-sparing agent," since so many of its antiestrogenic effects resembled those
|
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of progesterone.
|
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</p>
|
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<p>
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The Shute brothers began using vitamin E to treat circulatory diseases in general, rather than just in
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pregnant women--blood clots, phlebitis, hypertension, heart disease, and diabetes all responded well to
|
||||
treatment with large doses.
|
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</p>
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<p>
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Vitamin E, as its name indicates, was the fifth type of "vitamin" factor to be identified, and it received
|
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its name in 1922, even though its chemical structure hadn't been identified. The public quickly understood
|
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and accepted that certain substances in food were essential for life and health, so by 1940 practically all
|
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physicians were recommending the use of nutritional supplements.
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</p>
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<p>
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If vitamin E was essential for human health, and achieved at least some of its amazing effects by opposing
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estrogen, then the synthetic estrogen industry had a problem.
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</p>
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<p>
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Edward L. Bernays had already been in business for decades, teaching corporations and governments how to
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"engineer consent." After his work for the government to engineer support for entering the first world war,
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Bernays' next big job was for the tobacco industry. To convince women to smoke cigarettes, to achieve
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equality with men, he organized an Easter parade, Torches of Freedom, in which thousands of women marched
|
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smoking their freedom torches. In association with the American Medical Association (the editor of JAMA
|
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actually helped the tobacco industry design its campaigns), Bernays ran a campaign to convince Americans
|
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that smoking was good for the health.
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</p>
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<p>
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The drug industry began using his techniques in sometimes crude but always effective ways. Estrogen was
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named "the female hormone;" natural hormones, including estrogen and progesterone, were claimed, without any
|
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research, to be inactive when taken orally. Physician-shills were created to claim wonderful effects for
|
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estrogen. The vitamin status of the tocopherols was denied; as recently as the 1970s (and maybe later),
|
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university professors of dietetics were flatly saying "no one needs vitamin E."
|
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</p>
|
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|
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<p>
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Very little research showing the curative effects of vitamin E in human diseases was allowed to be
|
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published, so it was only occasionally necessary to openly denounce vitamin E as worthless or dangerous. In
|
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1981, the journal of the AMA published an article reviewing the "toxic" effects of vitamin E. Since I had
|
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read all of the articles cited, I realized that the author was claiming that whenever vitamin E changed
|
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something, the change was harmful, even though the original publication had described the effect as
|
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beneficial.
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</p>
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<p>
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Although JAMA was eventually forced to give up its revenue from cigarette advertising, it didn't suffer at
|
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all, because of the vast advertising campaigns of the estrogen industry. JAMA obviously wouldn't want to
|
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publish anything suggesting that vitamin E, or progesterone, or thyroid, might be beneficial because of its
|
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antagonism of the harmful effects of estrogen.
|
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</p>
|
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<p>
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Estrogen causes changes in the uterus that prevent implantation of the embryo, and that impair support for
|
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its development if it has already implanted. It decreases the availability of oxygen to the embryo, while
|
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vitamin E increases it.
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</p>
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<p>
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My dissertation adviser, A.L. Soderwall, did a series of experiments in which he showed that providing
|
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hamsters with extra vitamin E postponed the onset of infertility in middle age. In my experiments, vitamin E
|
||||
increased the amount of oxygen in the uterus, correcting an oxygen deficiency produced either by
|
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supplemental estrogen or by old age. Progesterone has similar effects on the delivery of oxygen to the
|
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uterus.
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</p>
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<p>
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In the 1940s, the official definition of vitamin E's activity was changed. Instead of its effectiveness in
|
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preventing the death and resorption of embryos, or the degeneration of the testicles or brain or muscles, it
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was redefined as an antioxidant, preventing the oxidation of unsaturated oils.
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</p>
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<p>
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Although some people continued to think of it as a protective factor against thrombosis, heart attacks,
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diabetes, and infertility, the medical establishment claimed that the prevention or cure of diseases in
|
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animals wasn't relevant to humans, and that a mere antioxidant couldn't prevent or cure any human disease.
|
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</p>
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<p>
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The experiments that led to the identification of vitamin E involved feeding rats a diet containing rancid
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lard and, as a vitamin A supplement, cod liver oil. Both of these contained large amounts of polyunsaturated
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oils.
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</p>
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<p>
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From 1929 to the early 1930s, other researchers were claiming to have demonstrated that the polyunsaturated
|
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fatty acids were nutritionally essential. These experiments, like the vitamin E experiments, were done on
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rats, but the medical establishment was satisfied that rat experiments proved that humans need linoleic or
|
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linolenic acid, while they refused to accept that vitamin E was essential for humans. When, in the 1940s, a
|
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group of vitamin B6 researchers showed that the supposed "essential fatty acid deficiency" could be cured by
|
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a supplement of vitamin B6, it became apparent that the polyunsaturated fatty acids slowed metabolism, and
|
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reduced all nutritional needs. The thyroid hormone was powerfully suppressed by the "essential" fatty acids.
|
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</p>
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<p>
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When we consider the two sets of experiments together, their outstanding feature is the toxicity of the
|
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polyunsaturated oils, which in one kind of experiment suppressed metabolism, and in the other kind of
|
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experiment created a variety of degenerative conditions.
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</p>
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<p>
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By the late 1940s and early 1950s, estrogens of various sorts had been synthesized from hydrocarbons, and
|
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were being recommended to prevent miscarriages, because "estrogen is the female hormone." The meat industry
|
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had found that the polyunsaturated oils were valuable in animal feed, since they suppressed metabolism and
|
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made it cheaper to fatten the animals, and these antithyroid oils were next marketed as "heart protective"
|
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human foods, though by suppressing the thyroid and destroying vitamin E, they actually contributed to both
|
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heart disease and cancer. (Giving estrogen to livestock to improve their feed efficiency, and to people "to
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prevent heart attacks," was an interesting parallel to the oil promotional campaigns.)
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</p>
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<p>
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The influence of the food oil industry kept researchers away from the idea that these oils were not safe for
|
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food use, and instead tended to support the idea that vitamin E is just an antioxidant, and that the seed
|
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oils were the best way to get vitamin E in the diet.
|
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</p>
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<p>
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The antifertility effects of the polyunsaturated oils, demonstrated in the vitamin E experiments, weren't at
|
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the time understood to have anything to do with estrogen's antifertility effects. But to understand vitamin
|
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E, I think we have to consider the close interactions between estrogen and the polyunsatured fatty acids
|
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(PUFA). Their actions are closely intertwined, and are antagonized by a variety of energizing and
|
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stabiliizing substances, including saturated fats, progesterone, thyroid, vitamin E, and aspirin.
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</p>
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<p>
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Generally, chemicals that inhibit enzymes are toxic, producing some sort of symptom or deterioration. But a
|
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group of enzymes related to estrogen and PUFA are inhibited by these protective substances. Although under
|
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our present diet, these enzymes metabolize the PUFA, in the fetus and newborn they act on our endogenous
|
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fats, the series related to the Mead acids. The Mead acid is antiinflammatory, and broadly protective. The
|
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dietary PUFA interfere with these natural protective substances,
|
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</p>
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<p>
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The enzymes that, if we didn"t eat PUFA, would be regulating the Mead series, being activated in response to
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stress, would be producing antistress substances, which would limit the stress reaction. But as we become
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increasingly saturated with the anti-vitamin E fats, these enzymes, instead of stopping inflammation,
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promote it and cause tissue injury. The remaining stress limiting factors, such as progesterone, by
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correcting the distortions caused by stress, tend to eliminate the conditions which activated the
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enzymes--in a very indirect form of inhibition.
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</p>
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<p>
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Many of the events involved in inflammation are increased by estrogen, and decreased by vitamin E. Estrogen
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causes capillaries to become leaky; vitamin E does the opposite. Estrogen increases platelet aggregation,
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and decreases a factor that inhibits platelet aggregation; vitamin E does the opposite.
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</p>
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<p>
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Excess clotting is known to be caused by too much estrogen, and also by a vitamin E deficiency.
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</p>
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<p>
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Clotting leads to fibrosis, and there is clear evidence that vitamin E prevents and cures fibrotic diseases,
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but this still isn't generally accepted by the powerful medical institutions. Estrogen and polyunsaturated
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fats increase fibrosis.
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</p>
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<p>
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Estrogen increases progstaglandin synthesis, vitamin E decreases their synthesis; estrogen increases the
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activity of the enzymes COX and LOX, vitamin E decreases their activitiy. (Jiang, et al., 2000; Ali, et al.,
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1980; Parkhomets, et al., 2001.) Estrogen releases enzymes from lysosomes, vitamin E inhibits their release.
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Beta-glucuronidase, one of these enzymes, can release estrogen at the site of an inflammation.
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</p>
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<p>
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Estrogen often increases intracellular calcium and protein kinase C, vitamin E has generally opposite
|
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effects.
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</p>
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<p>
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The polyunsaturated fatty acids and their derivatives, the prostaglandins, act as effectors, or amplifiers,
|
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of estrogen's actions.
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</p>
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<p>
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If vitamin E is acting as a protectant against the polyunsaturated fatty acids, that in itself would account
|
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for at least some of its antiestrogenic effects.
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</p>
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<p>
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Besides antagonizing some of the end effects of the toxic fatty acids, vitamin E inhibits lipolysis,
|
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lowering the concentration of free fatty acids (the opposite of estrogen"s effect), and it also binds to,
|
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and inactivates, free fatty acids. The long saturated carbon chain is very important for its full
|
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functioning, and this saturated chain might allow it to serve as a substitute for the omega -9 fats, from
|
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which the Mead acid is formed. The unsaturated tocotrienols have hardly been tested for the spectrum of true
|
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vitamin E activity, and animal studies have suggested that it may be toxic, since it caused liver
|
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enlargement.
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</p>
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<p>
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One possibly crucial protective effect of vitamin E against the polyunsaturated fatty acids that hasn't been
|
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explored is the direct destruction of linolenic and linoleic acid. It is known that <strong>bacterial
|
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vitamin E is involved in the saturation of unsaturated fatty acids, and it is also known that intestinal
|
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bacteria turn linoleic and linolenic acids into the fully saturated stearic acid.</strong>
|
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</p>
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<p>
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<strong>"No metabolic function is known for alpha-tocopherolquinol or its quinone other than as a cofactor
|
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in the biohydrogenation of unsaturated fatty acids that can be carried out by only a few
|
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organisms."</strong>
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</p>
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<p>
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<strong>
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<em>P.E. Hughes and S.B. Tove, 1982.</em></strong>
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</p>
|
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<p>
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<strong><em>"Linoleic acid was significantly decreased (P < 0.001) and there was a significant rise (P
|
||||
< 0.05) in its hydrogenation product, stearic acid. Linolenic acid was also significantly
|
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decreased. . . ." "The study provides evidence that bacteria from the human colon can hydrogenate
|
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C18 essential polyunsaturated fatty acids."</em></strong>
|
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</p>
|
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<p>
|
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<em>
|
||||
F.A. Howard & C.
|
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</em>
|
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<em>Henderson, 1999</em>
|
||||
</p>
|
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|
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<p>
|
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Because of the way in which the decision to call vitamin E a simple antioxidant was conditioned by the
|
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historical setting, there has been a reluctance, until recently, to give much weight to the pathogenicity of
|
||||
lipid peroxidation and free radicals, partly because lipid peroxidation is only a minor part of the toxicity
|
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of the polyunsaturated oils, and there was little support for the investigation of the real nature of their
|
||||
toxicity. This environment has even distorted the actual antioxidant value of the various forms of vitamin
|
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E. (For example, see Chen, et al., 2002.)
|
||||
</p>
|
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<p>
|
||||
The people who say that vitamin E is nothing but an antioxidant sometimes take other antioxidants, with, or
|
||||
instead of, vitamin E. BHT, BHA, and many natural compounds (derived from industrial and agricultural
|
||||
wastes) are often said to be "better than vitamin E" as antioxidants. Anything that can be oxidized and
|
||||
reduced (melatonin, estrogen, tryptophan, carotene, etc.) will function as an antioxidant in some system,
|
||||
but in other circumstances, it can be a pro-oxidant.
|
||||
</p>
|
||||
<p>
|
||||
The people who think there is benefit in the abstract "antioxidant" function seem to be thinking in terms of
|
||||
something that will, like a ubiquitous fire department, put out every little fire as soon as it starts. I
|
||||
think it's more appropriate to think of the biological antioxidant systems as programs for controlling the
|
||||
arsonists before they can set the fires.
|
||||
</p>
|
||||
<p>
|
||||
Since the requirement for vitamin E decreases as the consumption of unsaturated fats decreases, the
|
||||
requirement, if any, would be very small if we didn't eat significant quantities of those fats.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
In the years since the tocopherols were identified as vitamin E, the material sold for research and for use
|
||||
as a nutritional supplement has changed drastically several times, even when it has been given a specific
|
||||
chemical identity, such as mixed tocopherols or d-alpha tocopherol. Variations in viscosity and color,
|
||||
caused by changes in the impurities, have undoubtedly influenced its biological effects, but the ideology
|
||||
about its antioxidant value has kept researchers from finding out what a particular batch of it really is
|
||||
and what it really does.
|
||||
</p>
|
||||
<p>
|
||||
<strong>"We compared the effect of a mixed tocopherol preparation with that of alpha-tocopherol alone on
|
||||
superoxide dismutase (SOD) activity and iNOS expression in cultured myocytes exposed to
|
||||
</strong>
|
||||
<strong>H-R." "Both tocopherol preparations attenuated cell injury. . . ." "However, mixed-tocopherol
|
||||
preparation was much superior to alpha-tocopherol in terms of myocyte protection. . . ." "Lack of
|
||||
efficacy of commercial tocopherol preparations in clinical trials may reflect absence of gamma- and
|
||||
delta-tocopherols."</strong>
|
||||
</p>
|
||||
<p>
|
||||
<strong>Chen<em>
|
||||
H, Li D, Saldeen T, Romeo F, Mehta JL,Biochem Biophys Res Commun 2002 "Mixed tocopherol preparation
|
||||
is superior to alpha-tocopherol alone against hypoxia-reoxygenation injury."</em></strong>
|
||||
</p>
|
||||
<p>
|
||||
Keeping our diet as free as possible of the polyunsaturated fats, to create something like the "deficiency"
|
||||
state that is so protective (against cancer, trauma, poison, shock, inflammation, infection, etc.) in the
|
||||
animal experiments, seems preferable to trying to saturate ourselves with antioxidants, considering the
|
||||
imperfectly defined nature of the vitamin E products, and the known toxicity of many of the other
|
||||
antioxidants on the market.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The carcinogenic properties of the polyunsaturated fats have been known for more than 50 years, as has the
|
||||
principle of extending the life span by restricted feeding. More recently several studies have demonstrated
|
||||
that the long lived species contain fewer highly unsaturated fats than the short lived species. <strong
|
||||
>Restriction of calories prevents the lipids in the brain, heart, and liver from becoming more unsaturated
|
||||
with aging.</strong>
|
||||
(Lee, et al., 1999; Laganiere, et al., 1993; Tacconi, et al., 1991; R. Patzelt-Wenczler, 1981.)
|
||||
</p>
|
||||
<p>
|
||||
When cells are grown in tissue culture without the "essential fatty acids," they become "deficient," and in
|
||||
that state are very resistant to chemical injury, and can be grown indefinitely. Besides being a simple
|
||||
demonstration of the way in which the polyunsaturated fats sensitize cells to injury (Wey, et al., 1993),
|
||||
these experiments must be an embarrassment to the people who base their argument for the oils" essentiality
|
||||
on a supposed requirement for "making cell membranes." Since the cells can multiply nicely in their
|
||||
deficient state, we have to conclude that the oils aren"t needed for "membranes," or maybe that cells resist
|
||||
injury better "without membranes."
|
||||
</p>
|
||||
<p>
|
||||
In the opposite direction, an excess of insulin or prolactin, or a deficiency of vitamin E, increases the
|
||||
activity of the enzymes that convert linoleic acid into the more highly unsaturated fatty acids. Excess
|
||||
insulin and prolactin are crucially involved in many degenerative diseases.
|
||||
</p>
|
||||
<p>
|
||||
The highly unsaturated fats suppress respiration in many ways, and these trends toward increased
|
||||
unsaturation with aging, endocrine stress, and vitamin E deficiency parallel the life-long trend toward
|
||||
lower energy production from respiration. Many studies show that vitamin E can protect and improve
|
||||
mitochondrial energy production. (Kikuchi, et al., 1991; Donchenko, et al., 1990, 1983; Guarnieri, et al.,
|
||||
1981, 1982.) But the state of so-called essential fatty acid deficiency not only makes mitochondria very
|
||||
resistant to injury, it greatly intensifies their energy production. Vitamin E supplementation is seldom as
|
||||
effective as the absence of the toxic oils.
|
||||
</p>
|
||||
<p>
|
||||
Many nutrition charts no longer list liver as a good source of vitamin E, but a large portion of an animal"s
|
||||
vitamin E is in its liver. This bias in the dietetic literature can be traced to various sources, but a
|
||||
major influence was the campaign in the 1970s by the drug companies that had patented new forms of synthetic
|
||||
"vitamin A." They had physicians and professors fabricate stories about the great toxicity of natural
|
||||
vitamin A, and placed the stories in national magazines, to clear the field for their supposedly non-toxic
|
||||
products, which have turned out to be disastrously toxic. The result is that many people have fearfully
|
||||
stopped eating liver, because of its vitamin A. The other vitamins in liver, including vitamin K, function
|
||||
very closely with vitamin E, and the stably stored forms of vitamin E are likely to be a good approximation
|
||||
for our needs.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
There is still a strong division between what people can say in their professional publications, and what
|
||||
they believe. A man who was influential in designating vitamin E as an antioxidant, M.K. Horwitt, complained
|
||||
when the government raised its recommended vitamin E intake by 50%, because it wasn"t supported by new data,
|
||||
and because millions of people get only ten milligrams per day and "are healthy." But he has been taking 200
|
||||
mg daily (plus aspirin) for many years. He apparently doesn't have very much confidence in the ideas he
|
||||
advocates publicly.
|
||||
</p>
|
||||
<p><h3>REFERENCES</h3></p>
|
||||
<p>
|
||||
Prostaglandins Med 1980 Feb;4(2):79-85. <strong>Inhibition of human platelet cyclooxygenase by
|
||||
alpha-tocopherol.</strong> Ali M, Gudbranson CG, McDonald JW. Alpha-tocopherol, an inhibitor of platelet
|
||||
aggregation, was evaluated for its<strong>
|
||||
effects on the synthesis of thromboxane and prostaglandins. A dose-dependent reduction in thromboxane B2
|
||||
and prostaglandin D2 synthesis was observed with</strong>
|
||||
|
||||
approximately 60% inhibition at 5.0 IU or alpha-tocopherol. Alpha-tocopherol produced a time-dependent,
|
||||
irreversible inhibition.
|
||||
</p>
|
||||
<p>
|
||||
Int J Vitam Nutr Res 2001 Jan;71(1):18-24. <strong>Vitamin E and the prevention of atherosclerosis.</strong>
|
||||
Bron D, Asmis R. "Recent new findings have shed new light<strong>
|
||||
on the physiological role of vitamin E and suggest that it has a much broader array of biological
|
||||
activities than originally expected. In addition to its well described role as an antioxidant, it is
|
||||
becoming evident that vitamin E also can modulate the immune system, suppress local and chronic
|
||||
inflammation, reduce blood coagulation and thrombus formation, and enhance cell function and
|
||||
survival."</strong>
|
||||
</p>
|
||||
<p>
|
||||
Plast Reconstr Surg 1981 Nov;68(5):696-9. <strong>The effectiveness of alpha-tocopherol (vitamin E) in
|
||||
reducing the incidence of spherical contracture around breast implants.</strong> Baker JL Jr. Vitamin E
|
||||
appears to be a safe, simple, and inexpensive means of reducing the number of postoperative capsular
|
||||
contractures following breast augmentation. The synthetic form of vitamin E (alpha-tocopherol) is
|
||||
recommended to avoid nausea or skin eruptions in patients with oily skin, which are frequently encountered
|
||||
when the natural form is taken. No harmful side effects have been noted in any of the patients to date.
|
||||
Vitamin E has no effect on coagulation systems and does not cause excessive bleeding either during or after
|
||||
surgery. The recommended dosage of synthetic vitamin E is 1000 IU, b.i.d., for 2 years beginning 1 week
|
||||
before surgery. If no contracture exists at that time, the dosage may be reduced to 1000 IU daily
|
||||
thereafter.
|
||||
</p>
|
||||
<p>
|
||||
Carcinogenesis 1999 Jun;20(6):1019-24. <strong>Decrease in linoleic acid metabolites as a potential
|
||||
mechanism in cancer risk reduction by conjugated linoleic acid.</strong> Banni S, Angioni E, Casu V,
|
||||
Melis MP, Carta G, Corongiu FP, Thompson H, Ip C.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Mech Ageing Dev 1978 Nov;8(5):311-28. <strong>Anomalous vitamin E effects in mitochondrial oxidative
|
||||
metabolism.</strong> Baumgartner WA, Hill VA, Wright ET. Three different vitamin E effects, suggestive
|
||||
of specific antioxidant effects, were discovered in the protective action of vitamin E against respiratory
|
||||
decline (a decrease in mitochondrial respiration attributed to a "leakage" of electron transport radicals).
|
||||
<strong>
|
||||
No correlation was found between respiraotry decline and random lipid peroxidation.</strong> The
|
||||
mechanisms behind two of the three atypical vitamin E effects were defined. Both involve an artifact in the
|
||||
TBA assay for lipid peroxidation. This artifact occurs when TBA assays are carried<strong>
|
||||
out in the presence of sucrose and acetaldehyde; the latter is produced from ethanol, the solvent used
|
||||
to add vitamin E to preparations. The artifact in the TBA assay for peroxidations appears also to be
|
||||
responsible for differing interpretations of the hepatotoxic effect of ethanol.</strong>
|
||||
</p>
|
||||
<p>
|
||||
Eur J Biochem 1990 Mar 10;188(2):327-32. <strong>Polychlorinated biphenyls increase fatty acid desaturation
|
||||
in the proliferating endoplasmic reticulum of pigeon and rat livers.</strong> Borlakoglu JT,
|
||||
Edwards-Webb JD, Dils RR.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Nutr Cancer 2000;38(1):87-97. <strong>Effects of topical and oral vitamin E on pigmentation and skin cancer
|
||||
induced by ultraviolet irradiation in Skh:2 hairless mice.</strong> Burke KE, Clive J, Combs GF Jr,
|
||||
Commisso J, Keen CL, Nakamura RM. <strong>"Results showed that the skin concentrations of Eol, as well as
|
||||
levels in the adipose tissue, were increased after topical application. Mice treated with each form of
|
||||
vitamin E showed no signs of toxicity and had significantly less acute and chronic skin damage induced
|
||||
by UV irradiation, as indicated by reduced inflammation and pigmentation and by later onset and lesser
|
||||
incidence of skin cancer."</strong>
|
||||
</p>
|
||||
<p>
|
||||
Am J Physiol 1991 Jun;260(6 Pt 2):R1235-40. <strong>Acute phase response in exercise. II. Associations
|
||||
between vitamin E, cytokines, and muscle proteolysis.</strong> Cannon JG, Meydani SN, Fielding RA,
|
||||
Fiatarone MA, Meydani M, Farhangmehr M, Orencole SF, Blumberg JB, Evans WJ.
|
||||
</p>
|
||||
<p>
|
||||
Vrach Delo 1990 Dec;(12):6-8. <strong>[The effect of tocopherol and nicotinic acid on the microcirculation
|
||||
and blood coagulability in patients with ischemic heart disease]</strong> Chernomorets NN, Kotlubei GV,
|
||||
Vatutin NT, Zhivotovskaia IA, Gnilitskaia VB, Alifanova RE, Lobach EIa, Mal'tseva NV, Mitrofanov AN.
|
||||
"Complex treatment using tocopherol acetate produced a positive effect on the coagulation properties of the
|
||||
blood and did essentially influence the fibrinolytic activity and microcirculation. Tocopherol plus
|
||||
nicotinic acid resulted in normalization of the blood coagulation process,<strong>
|
||||
favoured activation of fibrinolysis and improvement of the microcirculatory bed."</strong>
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Free Radic Biol Med 1991;10(5):325-38. <strong>Oxidative status and oral contraceptive. Its relevance to
|
||||
platelet abnormalities and cardiovascular risk.</strong> Ciavatti M, Renaud S. INSERM Unit 63, Bron,
|
||||
France. <strong>"Oral contraceptive (OC) use is a risk for thrombogenic events."</strong> "From these data
|
||||
we conclude that: <strong>
|
||||
1. OC use modifies slightly but significantly the oxidative status in women and in animals by decreasing
|
||||
in plasma and blood cells the antioxidant defenses</strong> (vitamins and enzymes). 2. The changes in
|
||||
the oxidative status are related to an increase in plasma lipid peroxides apparently responsible for the
|
||||
hyperaggregability and possibly the imbalance in clotting factors associated with the OC-induced
|
||||
prethrombotic state. <strong>
|
||||
3. These effects of OC appear to be increased by a high intake of polyunsaturated fat and counteracted
|
||||
by supplements of vitamin E.</strong> 4. The risk factors acting synergistically with OC, have all been
|
||||
shown to increase platelet reactivity."
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Bol Med Hosp Infant Mex 1980 May-Jun;37(3):457-67. <strong>[Jaundice caused by microangiopathic hemolysis
|
||||
associated to septicemia in the newborn]</strong>
|
||||
Covarrubias Espinoza G, Lepe Zuniga JL. "These infants with over 3% fragmented cells<strong>
|
||||
were found to have a significant association with: sepsis, jaundice, crenated RBC's, low levels of
|
||||
hemoglobin, increased reticulocyte count, and low vitamin E levels."</strong>
|
||||
</p>
|
||||
<p>
|
||||
Endocrinology 1992 Nov;131(5):2482-4. <strong>Vitamin E protects hypothalamic beta-endorphin neurons from
|
||||
estradiol neurotoxicity.</strong> Desjardins GC, Beaudet A, Schipper HM, Brawer JR.<strong>
|
||||
"Estradiol valerate (EV) treatment has been shown to result in the destruction of 60% of beta-endorphin
|
||||
neurons in the hypothalamic arcuate nucleus. Evidence suggests that the mechanism of EV-induced
|
||||
neurotoxicity involves the conversion of estradiol to catechol estrogen and subsequent oxidation to free
|
||||
radicals in local peroxidase-positive astrocytes.</strong> In this study, we examined whether treatment
|
||||
with the antioxidant, vitamin E, protects beta-endorphin neurons from the neurotoxic action of estradiol.
|
||||
<strong>Our results demonstrate that chronic vitamin E treatment prevents the decrement in hypothalamic
|
||||
beta-endorphin concentrations resulting from arcuate beta-endorphin cell loss, suggesting that the
|
||||
latter is mediated by free radicals.</strong>
|
||||
<strong>Vitamin E treatment also prevented the onset of persistent vaginal cornification and polycystic
|
||||
ovarian condition which have been shown to result from the EV-induced hypothalamic pathology."</strong>
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Free Radic Biol Med 2000 Dec 15;29(12):1302-6. <strong>Hyperinsulinemia: the missing link among oxidative
|
||||
stress and age-related diseases?</strong>
|
||||
Facchini FS, Hua NW, Reaven GM, Stoohs RA. <strong>"Other proaging effects of insulin involve the inhibition
|
||||
of proteasome and the stimulation of polyunsaturated fatty acid (PUFA) synthesis and of nitric oxide
|
||||
(NO). The hypothesis that hyperinsulinemia accelerates aging also offers a</strong>
|
||||
<strong>metabolic explanation for the life-prolonging effect of calorie restriction</strong> and of
|
||||
mutations decreasing the overall activity of insulin-like receptors in the nematode Caenorhabditis elegans."
|
||||
</p>
|
||||
<p>
|
||||
J Bacteriol 1982 Sep;151(3):1397-402. <strong>Occurrence of alpha-tocopherolquinone and
|
||||
alpha-tocopherolquinol in microorganisms.</strong>
|
||||
Hughes PE, Tove SB. "Both alpha-tocopherolquinol and alpha-tocopherolquinone were found in 56 of 93 strains
|
||||
of microorganisms examined." "Those microorganisms that did not contain alpha-tocopherolquinol or
|
||||
alpha-tocopherolquinone tended to fall into two groups. One group consisted of gram-positive, anaerobic or
|
||||
facultative bacteria with a low content of guanine and cytosine, and the second group encompassed all of the
|
||||
filamentous microorganisms studied<strong>." "No metabolic function is known for alpha-tocopherolquinol or
|
||||
its quinone other than as a cofactor in the biohydrogenation of unsaturated fatty acids that can be
|
||||
carried out by only a few organisms."</strong>
|
||||
</p>
|
||||
|
||||
<p>
|
||||
J Biol Chem 1980 Dec 25;255(24):11802-6. <strong>Identification of deoxy-alpha-tocopherolquinol as another
|
||||
endogenous electron donor for biohydrogenation.</strong> Hughes PE, Tove SB.
|
||||
</p>
|
||||
<p>
|
||||
J Biol Chem 1980 May 25;255(10):4447-52. <strong>Identification of an endogenous electron donor for
|
||||
biohydrogenation as alpha-tocopherolquinol.</strong> Hughes PE, Tove SB. "The ratio of
|
||||
alpha-tocopherolquinone produced to fatty acid reduced was 2:1 when the tocopherol derivatives were
|
||||
extracted aerobically. When the extraction was carried out anaerobically, the ratio was 1. It is suggested
|
||||
that the oxidation of 2 molecules of alpha-tocopherolquinol, each to the semiquinone, provides the electrons
|
||||
required for the reduction of the cis-bond of the conjugated dienoic fatty acid."
|
||||
</p>
|
||||
<p>
|
||||
Lett Appl Microbiol 1999 Sep;29(3):193-6. <strong>Hydrogenation of polyunsaturated fatty acids by human
|
||||
colonic bacteria.</strong> Howard FA, Henderson C. Emulsions of the fatty acids linoleic (C18:2 n-6),
|
||||
alpha-linolenic (C18:3 n-3) and arachidonic acid (C20:4 n-6) were incubated for 4 h under anaerobic
|
||||
conditions with human faecal suspensions. <strong>Linoleic acid was significantly decreased (P < 0.001)
|
||||
and there was a significant rise (P < 0.05) in its hydrogenation product, stearic acid. Linolenic
|
||||
acid was also significantly decreased (P < 0.01), and significant increases in C18:3 cis-trans
|
||||
isomers (P < 0.01) and linoleic acid (P < 0.05) were seen. With each acid, there were
|
||||
non-significant increases in acids considered to be intermediates in biohydrogenation. The study
|
||||
provides evidence that bacteria from the human colon can hydrogenate C18 essential polyunsaturated fatty
|
||||
acids.</strong>
|
||||
|
||||
However, with arachidonic acid there was no evidence of hydrogenation.
|
||||
</p>
|
||||
<p>
|
||||
Prostaglandins Leukot Essent Fatty Acids 1998 Dec;59(6):395-400. <strong>Modulation of rat liver lipid
|
||||
metabolism by prolactin.</strong> Igal RA, de Gomez Dumm IN, Goya RG.
|
||||
</p>
|
||||
<p>
|
||||
Clin Chim Acta 1994 Mar;225(2):97-103. <strong>Vitamin E and the hypercoagulability of neonatal
|
||||
blood.</strong> Jain SK, McCoy B, Wise R. <strong><hr /></strong>"
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Proc Natl Acad Sci U S A 2000 Oct 10;97(21):11494-9. <strong>gamma-tocopherol and its major metabolite, in
|
||||
contrast to alpha-tocopherol, inhibit cyclooxygenase activity in macrophages and epithelial
|
||||
cells.</strong> Jiang Q, Elson-Schwab I, Courtemanche C, Ames BN<strong>. "Cyclooxygenase-2
|
||||
(COX-2)-catalyzed synthesis of prostaglandin E(2) (PGE(2)) plays a key role in inflammation and its
|
||||
associated diseases, such as cancer and vascular heart disease. Here we report that gamma-tocopherol
|
||||
(gammaT) reduced PGE(2) synthesis in both lipopolysaccharide (LPS)-stimulated RAW264.7 macrophages and
|
||||
IL-1beta-treated A549 human epithelial cells with an apparent IC(50) of 7.5 and 4 microM, respectively."
|
||||
"The inhibitory effects of gammaT and gamma-CEHC stemmed from their inhibition of COX-2 activity, rather
|
||||
than affecting protein expression or substrate availability, and appeared to be independent of
|
||||
antioxidant activity."</strong>
|
||||
"The inhibitory potency of gammaT and gamma-CEHC was diminished by an increase in AA concentration,
|
||||
suggesting that they might compete with AA at the active site of COX-2. We also observed a moderate
|
||||
reduction of nitrite accumulation and suppression of inducible nitric oxide synthase expression by gammaT in
|
||||
lipopolysaccharide-treated macrophages. These findings indicate that gammaT and its major metabolite possess
|
||||
anti-inflammatory activity and that gammaT at physiological concentrations may be important in human disease
|
||||
prevention."
|
||||
</p>
|
||||
<p>
|
||||
Biosci Biotechnol Biochem 1992 Sep;56(9):1420-3.<strong>
|
||||
Effects of alpha-tocopherol and tocotrienols on blood pressure and linoleic acid metabolism in the
|
||||
spontaneously hypertensive rat (SHR).</strong> Koba K, Abe K, Ikeda I, Sugano M. Both alpha-tocopherol
|
||||
and a 1:1.7 mixture of alpha-tocopherol and tocotrienols at a 0.2% dietary level significantly depressed the
|
||||
age-related increase in the systolic blood pressure of spontaneously hypertensive rats (SHRs) after 3 weeks
|
||||
of feeding. <strong>The aortic production of prostacyclin was increased 1.5 times both by alpha-tocopherol
|
||||
and a tocotrienol mixture, suggesting a possible relevance to their hypotensive</strong> effect. These
|
||||
vitamins did not influence the delta 6- and delta 5-desaturase activities of liver microsomes, <strong>but
|
||||
fatty acid profiles of the liver phospholipids predicted a reduction of linoleic acid
|
||||
desaturation.</strong> These effects were in general more clear with tocotrienols than with
|
||||
alpha-tocopherol. Platelet aggregation by 5 microM ADP remained uninfluenced. Thus, tocotrienols may have
|
||||
effects on various lipid parameters somewhat different from those of alpha-tocopherol.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Gerontology 1993;39(1):7-18. <strong>Modulation of membrane phospholipid fatty acid composition by age and
|
||||
food restriction.</strong>
|
||||
Laganiere S, Yu BP. H.M. "Phospholipids from liver mitochondrial and microsomal membrane preparations were
|
||||
analyzed to further assess the effects of age and lifelong calorie restriction on membrane lipid
|
||||
composition." <strong>"The data revealed characteristic patterns of age-related changes in ad libitum (AL)
|
||||
fed rats:</strong>
|
||||
<strong>membrane levels of long-chain polyunsaturated fatty acids, 22:4 and 22:5, increased progressively,
|
||||
while membrane linoleic acid (18:2) decreased steadily with age. Levels of 18:2 fell by approximately
|
||||
40%, and 22:5 content almost doubled making the peroxidizability index increase with age.</strong>"
|
||||
"<strong>We concluded that the membrane-stabilizing action of long-term calorie restriction relates to the
|
||||
selective modification of membrane long-chain polyunsaturated fatty acids during aging.</strong>"
|
||||
</p>
|
||||
<p>
|
||||
Free Radic Biol Med 1999 Feb;26(3-4):260-5. <strong>Modulation of cardiac mitochondrial membrane fluidity by
|
||||
age and calorie intake.</strong> Lee J, Yu BP, Herlihy JT. <strong>"The fatty acid composition of the
|
||||
mitochondrial membranes of the two ad lib fed groups differed: the long-chain polyunsaturated 22:4 fatty
|
||||
acid was higher in the older group, although linoleic acid (18:2) was lower. DR eliminated the
|
||||
differences."</strong>
|
||||
|
||||
"Considered together, these results suggest that DR <strong>maintains the integrity of the cardiac
|
||||
mitochondrial membrane fluidity by minimizing membrane damage through modulation of membrane fatty acid
|
||||
profile."</strong>
|
||||
</p>
|
||||
<p>
|
||||
Lipids 2001 Jun;36(6):589-93. <strong>Effect of dietary restriction on age-related increase of liver
|
||||
susceptibility to peroxidation in rats.</strong> Leon TI, Lim BO, Yu BP, Lim Y, Jeon EJ, Park DK.
|
||||
</p>
|
||||
<p>
|
||||
Jpn J Pharmacol 1979 Apr;29(2):179-86. <strong>
|
||||
Effect of linoleic acid hydroperoxide on liver microsomal enzymes in vitro.</strong> Masuda Y, Murano T.
|
||||
"Rat liver microsomes incubated with linoleic acid hydroperoxide (LAHPO) lost cytochrome P-450 specifically
|
||||
among the enzymes of microsomal electron transport systems. The loss of cytochrome P-450 content and
|
||||
glucose-6-phosphatase activity by LAHPO was accompanied by an increase in malondialdehyde (MDA) production."
|
||||
"These results suggest the possibility that the loss of microsomal enzyme activities during lipid
|
||||
peroxidation may be attributed<strong>
|
||||
largely to a direct attack on enzyme proteins by lipid peroxides rather than</strong>
|
||||
|
||||
indirectly to a structural damage of microsomal membranes resulting from peroxidative breakdown of membrane
|
||||
lipids."
|
||||
</p>
|
||||
<p>
|
||||
Ukr Biokhim Zh 2001 Jan-Feb;73(1):43-7. <strong>[Effect of alpha-tocopherol, tocopheryl quinone and other
|
||||
complexes with tocopherol-binding proteins on the activity of enzymes metabolizing arachidonic
|
||||
acid]</strong> Parkhomets' VP, Silonov SB, Donchenko HV. Palladin Institute of Biochemistry, National
|
||||
Academy of Science of Ukraine, Kyiv. alpha-Tocopherol, tocopherylquinon jointly with the proteins tocopherol
|
||||
acceptors from cytosole <strong>were identified to inhibit the activity of 5-lipoxigenase and so the
|
||||
synthesis of leukotriene A4 at the early stages providing for A4 hydrolase activation and C4
|
||||
synthesase,</strong> as well as accelerate leukotrienes B4 and C4 synthesis at the further stages
|
||||
respectively changing the final spectrum of leukotriens in the organism tissues. Firstly, the leading role
|
||||
of proteins complexes capable to strengthen the effect of alpha-tocopherol and tocopherylquinon on
|
||||
arachidonic acid oxidative metabolism was determined.
|
||||
</p>
|
||||
<p>
|
||||
Int J Vitam Nutr Res 1981;51(1):26-33. <strong>[Effect of vitamin E on the synthesis of polyunsaturated
|
||||
fatty acids]</strong> Patzelt-Wenczler R. The formation of polyunsaturated fatty acids is influenced by
|
||||
vitamin E. The enzyme of the endoplasmic reticulum isolated from rat liver responsible for chain elongation
|
||||
and desaturation showed higher activity under vitamin E-deficiency. The activity was raised both per mg
|
||||
protein and per mg DNA. The application of alpha-Tocopherol to the vitamin E-deficient animals caused the
|
||||
normalization of the enzyme activity within 48 hours. This indicates a regulatory function of
|
||||
alpha-Tocopherol in the process of oxidation.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Lipids 2001 May;36(5):491-8. <strong>Correlation of fatty acid unsaturation of the major liver mitochondrial
|
||||
phospholipid classes in mammals to their maximum life span potential.</strong>
|
||||
Portero-Otin M, Bellmunt MJ, Ruiz MC, Barja G, Pamplona R.
|
||||
</p>
|
||||
<p>
|
||||
Free Radic Biol Med 1999 Oct;27(7-8):729-37. <strong>Age-dependent increase of collagenase expression can be
|
||||
reduced by alpha-tocopherol via protein kinase C inhibition.</strong> Ricciarelli R, Maroni P, Ozer N,
|
||||
Zingg JM, Azzi A. "Our in vitro experiments with skin fibroblasts suggest that alpha-tocopherol may protect
|
||||
against skin aging by decreasing the level of collagenase expression, which is induced by environmental
|
||||
insults and by aging."
|
||||
</p>
|
||||
<p>
|
||||
Prostaglandins Leukot Essent Fatty Acids 1991 Oct;44(2):89-92. <strong>Inhibition of PGE2 production in
|
||||
macrophages from vitamin E-treated rats.</strong> Sakamoto W, Fujie K, Nishihira J, Mino M, Morita I,
|
||||
Murota S.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Int J Vitam Nutr Res 1990;60(1):26-34. <strong>The influence of vitamin E on rheological parameters in high
|
||||
altitude mountaineers.</strong> Simon-Schnass I, Korniszewski L. <strong>"The erythrocyte filterability
|
||||
was unaltered in the vitamin E group in comparison with baseline but was significantly impaired in the
|
||||
control group."</strong>
|
||||
</p>
|
||||
<p>
|
||||
Neurobiol Aging 1991 Jan-Feb;12(1):55-9. <strong>Aging and food restriction: effect on lipids of cerebral
|
||||
cortex.</strong> Tacconi MT, Lligona L, Salmona M, Pitsikas N, Algeri S. In experimental animals dietary
|
||||
restriction reduces the body weight increase due to aging, increases longevity and delays the onset of
|
||||
age-related physiological deterioration, including age-related changes in serum lipids. Little is known
|
||||
about the influence of food restriction on brain lipids, whose concentration and composition have been shown
|
||||
to change with age. We studied whether some biochemical and biophysical parameters of rat brain membranes,
|
||||
known to be modified with age, were affected by a diet low in calories, in which 50% of lipids and 35% of
|
||||
carbohydrates have been replaced by fibers. The diet was started at weaning and maintained throughout the
|
||||
animal's entire life span. Animals fed the low calorie diet survived longer and gained less body weight than
|
||||
standard diet fed rats. Age-related increases in microviscosity, cholesterol/phospholipid and
|
||||
sphingomyelin/phosphatidylcholine ratios were <strong>reduced or restored to the levels of young animals in
|
||||
cortex membranes of 32 old rats fed the low calorie diet, while the age-related increase in mono- to
|
||||
polyunsaturated fatty acid ratios in phospholipids was further raised.</strong> In conclusion we have
|
||||
shown that a diet low in calories and high in fibers affects lipid composition in the rat brain, <strong>in
|
||||
a direction opposite to that normally believed to reduce age-related deterioration of brain
|
||||
functions</strong>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Toxicol Appl Pharmacol 1993 May;120(1):72-9. <strong>Essential fatty acid deficiency in cultured human
|
||||
keratinocytes attenuates toxicity due to lipid peroxidation.</strong> Wey HE, Pyron L,<strong>
|
||||
Human keratinocytes are commonly grown in culture with a serum-free medium. Under these conditions,
|
||||
keratinocytes become essential fatty acid deficient (EFAD), as determined by gas chromatographic
|
||||
analysis of cell phospholipid fatty acid composition. Exposure of EFAD keratinocytes for 2 hr to
|
||||
concentrations of t-butyl hydroperoxide (tBHP) up to 2 mM did not result in toxicity assessed by lactate
|
||||
dehydrogenase (LDH) release and only a small indication of lipid peroxidation assessed by the release of
|
||||
thiobarbituric acid-reactive substances</strong> (TBARS). Addition of 10 microM linoleic acid (LA) to
|
||||
serum-free medium alleviated the EFAD condition by increasing the phospholipid content of LA and its
|
||||
elongation and desaturation products, arachidonic acid and docosatetraenoic acid. Exposure of
|
||||
LA-supplemented keratinocytes to tBHP resulted in significant LDH (at 1 and 2 mM tBHP) and TBARS (tBHP
|
||||
concentration dependent) release. TBARS release was also significantly elevated in unexposed LA-supplemented
|
||||
keratinocytes (basal release). Co-supplementation with the antioxidant,<strong>
|
||||
alpha-tocopherol succinate (TS) prevented tBHP (1 mM)-induced LDH release in LA-supplemented cultures.
|
||||
TS supplementation also attenuated the effect of tBHP on TBARS release, but when compared to
|
||||
TS-supplemented EFAD cultures, LA</strong> supplementation still led to increased tBHP-induced TBARS
|
||||
release. Keratinocyte cultures are potentially useful as an alternative to animals in toxicology research
|
||||
and testing. It is important, however, that the cell model provide a response to toxic insult similar to
|
||||
that experienced in vivo. Our results suggest that fatty acid and antioxidant nutrition of cultured
|
||||
keratinocytes are important parameters in mediating the toxic effects of lipid peroxidation.
|
||||
</p>
|
||||
<p>
|
||||
Cancer Lett 1997 Jan 1;111(1-2):179-85. <strong>Subcutaneous, omentum and tumor fatty acid composition, and
|
||||
serum insulin status in patients with benign or cancerous ovarian or endometrial tumors. Do tumors
|
||||
preferentially utilize polyunsaturated fatty acids?</strong> Yam D, Ben-Hur H, Dgani R, Fink A, Shani A,
|
||||
Berry EM.
|
||||
</p>
|
||||
|
||||
<em>
|
||||
AC Chan, J. of Nutrition, 1998</em>
|
||||
|
||||
"The response-to-injury hypothesis explains atherosclerosis as a chronic inflammatory response to injury of the
|
||||
endothelium, which leads to complex cellular and molecular interactions among cells derived from the
|
||||
endothelium, smooth muscle and several blood cell components. Inflammatory and other stimuli trigger an
|
||||
overproduction of free radicals, which promote peroxidation of lipids in LDL trapped in the subendothelial
|
||||
space. Products of LDL oxidation are bioactive, and they induce endothelial expression and secretion of
|
||||
cytokines, growth factors and several cell surface adhesion molecules. The last-mentioned are capable of
|
||||
recruiting circulating monocytes and T lymphocytes into the intima where monocytes are differentiated into
|
||||
macrophages, the precursor of foam cells. In response to the growth factors and cytokines, smooth muscle cells
|
||||
proliferate in the intima, resulting in the narrowing of the lumen. Oxidized LDL can also inhibit endothelial
|
||||
production of prostacyclin and nitric oxide, two potent autacoids that are vasodilators and inhibitors of
|
||||
platelet aggregation. Evidence is presented that vitamin E is protective against the development of
|
||||
atherosclerosis. Vitamin E enrichment has been shown to retard LDL oxidation, inhibit the proliferation of
|
||||
smooth muscle cells, inhibit platelet adhesion and aggregation, inhibit the expression and function of adhesion
|
||||
molecules, attenuate the synthesis of leukotrienes and potentiate the release of prostacyclin through
|
||||
up-regulating the expression of cytosolic phospholipase A2 and cyclooxygenase. Collectively, these biological
|
||||
functions of vitamin E may account for its protection against the development of atherosclerosis."
|
||||
<p>
|
||||
6: Early Hum Dev 1994 Nov 18;39(3):177-88 Vitamin A and related essential nutrients in cord blood:
|
||||
relationships with anthropometric measurements at birth. Ghebremeskel K, Burns L, Burden TJ, Harbige L,
|
||||
Costeloe K, Powell JJ, Crawford M. Institute of Brain Chemistry and Human Nutrition, Queen Elizabeth
|
||||
Hospital for Children, London, UK. Following the advice given by the Department of Health to women who are,
|
||||
or may become pregnant, not to eat liver and liver products because of the risk of vitamin A toxicity, the
|
||||
concentrations of vitamins A and E, and copper, magnesium and zinc in cord blood were investigated. The
|
||||
study was conducted in Hackney, an inner city area of London. Esters of vitamin A were not detected in any
|
||||
of the samples, indicating that there was no biochemical evidence of a risk of toxicity. Indeed, vitamin A
|
||||
correlated significantly with birthweight, head circumference, length, and gestation period. There was also
|
||||
a significant positive relationship between zinc and birthweight. In contrast, copper showed a negative
|
||||
correlation with birthweight and head circumference. Vitamin E and magnesium were not associated with any of
|
||||
the anthropometric measurements, although magnesium showed an increasing trend with birthweight. The data
|
||||
suggest that most of the mothers of the subjects studied may have been marginal with respect to vitamins A
|
||||
and E and zinc. In those with low birthweight babies. a higher intake would have improved their nutritional
|
||||
status and possibly the outcome of their pregnancy. For these low-income mothers, liver and liver products
|
||||
are the cheapest and the best source of vitamins A and E, haem iron, B vitamins and several other essential
|
||||
nutrients; hence the advice of the Department of Health may have been misplaced.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
© Ray Peat 2006. All Rights Reserved. www.RayPeat.com
|
||||
</p>
|
||||
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