Vitamin E -- Main Page
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Vitamin E --- How Much Is
Enough
There is 705 International Units of Vitamin E in the Life Glow formula.
There is a similar quantity when you take the full 30 capsule dose of Super Life
Glow.
There have been claims that much more than this can be toxic. I
disagree with those who say that. There is plenty of evidence that doses
up to 100,000 IU per day have been very effective in preventing heart disease.
Claims of toxicity often trace back to liquid Vitamin E injections -- often
in babies.
I've listed, below, a series of 20 scientific studies on this general
subject. These studies were the first 20 out of several hundred when I used the
search phrase: "vitamin E toxicity." So, I was NOT looking
for articles that were likely to be favorable to Vitamin E. See how much
criticism you can find here of large doses of Vitamin E! In fact,
most of the studies which mention Vitamin E are very favorable as to its
treatment to prevent cancer. There are even studies which comment on the
low toxicity of Vitamin E. The two studies which follow the party line
claim that you can get all the Vitamins you need from food. If you believe
that you are on the wrong web site!
Here is a good explanation of
Vitamin E, on a different page.
Below, still on this page are various articles and studies
concerning Vitamin E.
Let me know what YOU think.
Top Of Menu
| Click
On The Number/Link To Read The Study |
| Number |
Title |
Comment |
| ...1... |
- Safety of antioxidant vitamins and beta-carotene.
|
The toxicity of vitamin E is
low; no mutagenic, teratogenic, or carcinogenic effects are known and in
double-blind studies in which large amounts of vitamin E were used in humans, no
side effects occurred. |
| ...2... |
- Chemoprevention of oral cancer: beta-carotene and vitamin E in leukoplakia.
|
Beta-carotene and vitamin E, unlike the
retinoids, fulfill the criteria for a suitable chemopreventive agent and several
lines of evidence point to a preventive role for them against oral cancer. |
| ...3... |
- Vitamin E in the genesis and prevention of cancer. A review.
|
The findings of different groups
suggest that this vitamin may be helpful as a cancer chemopreventive agent. |
| ...4... |
- Antioxidants in oral cancer prevention.
|
I present evidence in support of a chemopreventive role for the so-called
antioxidant nutrients, beta-carotene and vitamin E, against oral cavity cancer. |
| ...5... |
- Small bowel intussusception and brown bowel syndrome in association with
severe malnutrition.
|
|
| ...6... |
- Vitamin supplementation therapy in the elderly.
|
"An adequate
intake of vitamins should be ensured by adherence to a well balanced diet.
" |
| ...7... |
- Mechanistic considerations in chemopreventive drug development.
|
Chemopreventive antioxidant
activities include scavenging reactive electrophiles (GSH-enhancing agents),
scavenging oxygen radicals (polyphenols, vitamin E), and inhibiting arachidonic
acid metabolism (glycyrrhetinic acid, NAC, NSAIDs, polyphenols, tamoxifen). |
| ...8... |
- Susceptibility to alcohol-related liver injury.
|
|
| ...9... |
- Deciphering the cause of Friedreich ataxia.
|
This finding suggests that FA patients suffer from a
mitochondrial dysfunction that causes free-radical toxicity, reminiscent of the
clinically similar ataxia caused by inherited isolated vitamin E deficiency. |
| ...10... |
- Magnesium and therapeutics.
|
|
| Menu
Position #10 |
| ...11... |
- The toxicity of air pollution in experimental animals and humans: the role
of oxidative stress.
|
My hypothesis is that NO2 and O3 initiate or exacerbate chronic lung
disease through an inflammatory mechanism which can be reduced by
supplementation with greater amounts than those required to alleviate vitamin
deficiency symptoms of vitamins C (ascorbic acid) and E (alpha-tocopherol). |
| ...12... |
- Tretinoin tocoferil as a possible differentiation-inducing agent against
myelomonocytic leukemia.
|
|
| ...13... |
- Hepatic side-effects of antibiotics.
|
|
| ...14... |
- Cancer of the prostate: a nutritional disease?
|
In summary, epidemiologic and laboratory evidence increasingly demonstrate
that nutritional factors, especially reduced fat intake, soy proteins, vitamin E
derivatives, and selenium, may have a protective effect against prostate cancer. |
| ...15... |
- Effect of calcium channel blockers on intracellular calcium accumulation.
|
|
| ...16... |
- Effectiveness of beta-carotene in cancer chemoprevention.
|
In vivo animal studies partially confirm the
results obtained in vitro showing that beta-carotene is able to reduce the
induce cancer development; moreover, the association of the carotenoid with
other microelements, such as vitamins E, C and glutathione often appears to be
more effective than each agent used alone. |
| ...17... |
- Treatment of refractory cutaneous lupus erythematosus.
|
|
| ...18... |
- P-glycoprotein functions and substrates: possible roles of MDR1 gene in the
kidney.
|
|
| ...19... |
- Bioactivities of N-(4-hydroxyphenyl) retinamide and retinoyl
beta-glucuronide.
|
|
| ...20... |
- Safety of megavitamin therapy.
|
This is pure hogwash: "A
well-balanced diet that includes a wide variety of foods from each of the four
food groups is adequate for the supply of vitamins, as well as other nutrients,
in healthy people." |
| Menu
Position #20 |
HealthGate Documents
Record 1 from database: MEDLINE
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- Title
- Safety of antioxidant vitamins and beta-carotene.
- Author
- Diplock AT
- Address
- Division of Biochemistry and Molecular Biology, United Medical School, Guy's
Hospital, University of London, United Kingdom.
- Source
- Am J Clin Nutr, 1995 Dec, 62:6 Suppl, 1510S-1516S
- Abstract
- Epidemiologic evidence links high antioxidant status with low risk of
degenerative disease. Optimal intakes of antioxidants may not be achievable by
diet alone; supplements may be taken, particularly in subgroups of the
population at high risk. It is thus necessary to ensure that antioxidant
supplements are safe and free from side effects. The toxicity of vitamin E is
low; no mutagenic, teratogenic, or carcinogenic effects are known and in
double-blind studies in which large amounts of vitamin E were used in humans, no
side effects occurred. High concentrations are contraindicated in subjects with
vitamin K-associated blood coagulation disorders, and the toxicity in normal
subjects ingesting large amounts of vitamin E over long periods requires
additional investigation. Toxicity of beta-carotene also is low. Evidence from
human toxicity trials is not available but there is much circumstantial evidence
that 15-50 mg/d is without side effects except for hypercarotenemia in some
subjects at high intakes. The findings of more lung cancer in subjects who
smoked and who were given 20 mg beta-carotene/d than in those given a placebo
could be influenced by the cancer being well advanced before beta-carotene
administration. Massive anecdotal evidence exists that vitamin C (at > or = 1
g/d) is safe. Exhaustive literature searches have failed to reveal a controlled
study of vitamin C toxicity in human subjects. Anxiety exists about oxalate
stone formation, uricosuria, vitamin B-12 destruction, mutagenicity, and iron
overload, but the consensus is that adverse effects do not occur in healthy
subjects ingesting large amounts of vitamin C.
- Language of Publication
- English
- Unique Identifier
- 96094709
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- MeSH Heading (Major)
- Antioxidants|*AE; Ascorbic Acid|*AE; Carotene|*AE; Vitamin E|*AE
- MeSH Heading
- Human
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0002-9165
- Country of Publication
- UNITED STATES
Record 2 from database: MEDLINE
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- Title
- Chemoprevention of oral cancer: beta-carotene and vitamin E in leukoplakia.
- Author
- Garewal H
- Address
- Section of Hematology-Oncology, University of Arizona, Tucson.
- Source
- Eur J Cancer Prev, 1994 Mar, 3:2, 101-7
- Abstract
- The most definitive and direct way to show that a putative chemoprevention
agent actually prevents cancer would be to demonstrate a reduction in cancer
incidence in a clinical trial. From a practical standpoint this approach is not
feasible for most cancers. Therefore, it becomes necessary to draw conclusions
on chemopreventive activity through consideration of indirect lines of evidence,
one of which is activity in premalignant lesions such as leukoplakia. As a
corollary, it must be emphasized that the goal of undertaking chemoprevention
trials in oral leukoplakia is to develop approaches for the prevention of oral
cancer. Because the risk of cancer in the usual leukoplakia lesion is low, only
non-toxic agents should be tested in this setting and they should be suited for
eventual use in a prevention setting. Beta-carotene and vitamin E, unlike the
retinoids, fulfill the criteria for a suitable chemopreventive agent and several
lines of evidence point to a preventive role for them against oral cancer. These
include laboratory in vitro and animal model findings, but the strongest
evidence comes from epidemiologic studies which uniformly suggest protection by
beta-carotene against head and neck cancer. Much like the retinoids, but without
toxicity, beta-carotene and vitamin E can produce regression of oral
leukoplakia, a premalignant lesion for oral cancer, as has now been shown in
eight clinical trials, five with beta-carotene alone, one with vitamin E alone
and two that used these agents as part of combinations.(ABSTRACT TRUNCATED AT
250 WORDS)
- Language of Publication
- English
- Unique Identifier
- 94290282
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- MeSH Heading (Major)
- Carotene|AD/*TU; Leukoplakia, Oral|*PC; Mouth Neoplasms|*PC; Vitamin
E|AD/*TU
- MeSH Heading
- Animal; Clinical Trials; Drug Combinations; Human; Support, U.S. Gov't,
P.H.S.
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0959-8278
- Country of Publication
- ENGLAND
Record 3 from database: MEDLINE
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- Title
- Vitamin E in the genesis and prevention of cancer. A review.
- Author
- Das S
- Address
- Department of Experimental Leukaemia, Chittaranjan National Cancer
Institute, Calcutta, India.
- Source
- Acta Oncol, 1994, 33:6, 615-9
- Abstract
- A review of current literature reveals that the relationships between
vitamin E and cancer is not yet fully understood though many experimental and
clinical studies have shown that vitamin E can protect against carcinogenesis
and tumour growth. This vitamin also appears to reduce toxicity of several
anticancer therapies. Such effects are probably due to the antioxidant property
and immunomodulatory function of vitamin E. The findings of different groups
suggest that this vitamin may be helpful as a cancer chemopreventive agent.
- Language of Publication
- English
- Unique Identifier
- 95033327
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- MeSH Heading (Major)
- Anticarcinogenic Agents|*PD; Neoplasms|*PC; Vitamin E|*PD
- MeSH Heading
- Animal; Antioxidants; Human; Immunity|DE
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0284-186X
- Country of Publication
- NORWAY
Record 4 from database: MEDLINE
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- Title
- Antioxidants in oral cancer prevention.
- Author
- Garewal H
- Address
- University of Arizona Medical Center, Tucson, USA.
- Source
- Am J Clin Nutr, 1995 Dec, 62:6 Suppl, 1410S-1416S
- Abstract
- I present evidence in support of a chemopreventive role for the so-called
antioxidant nutrients, beta-carotene and vitamin E, against oral cavity cancer.
This evidence is from laboratory studies, animal model systems, epidemiologic
surveys, intervention trials involving reversal of premalignant changes, and
prevention of malignancies in particularly high-risk subjects. Because agents
proposed for disease prevention are meant to be used widely without close
medical supervision, almost any toxicity is unacceptable. beta-Carotene and
vitamin E fulfill this criterion for a suitable chemopreventive agent. In
several epidemiologic studies, low intakes of vitamin E, carotenoids, or both
have been associated with a higher cancer risk. Smoking, a major risk factor,
results in lower beta-carotene concentrations in plasma and oral mucosal cells.
In several laboratory and animal model systems, beta-carotene and other
antioxidant nutrients are inhibitors of oral cavity carcinogenesis.
beta-Carotene and vitamin E can produce clinical regression of oral leukoplakia,
a premalignant lesion for oral cancer. The design and limitations of such
studies in oral leukoplakia are discussed. Cancer incidence reduction trials in
high-risk groups have targeted prevention of second malignancies in patients
cured of a primary oral cancer. These trials are in progress. The data thus far
are supportive of a significant preventive role for these nutrients in oral
cancer.
- Language of Publication
- English
- Unique Identifier
- 96094696
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- MeSH Heading (Major)
- Antioxidants|*AD; Carotene|*AD; Mouth Neoplasms|*PC; Vitamin E|*AD
- MeSH Heading
- Animal; Human; Leukoplakia, Oral|PC
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0002-9165
- Country of Publication
- UNITED STATES
Record 5 from database: MEDLINE
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- Title
- Small bowel intussusception and brown bowel syndrome in association with
severe malnutrition.
- Author
- Drake WM; Winter TA; Price SK; OKeefe SJ
- Address
- Department of Gasiroenterology, Groote Schuur Hospital, University of Cape
Town, Observatory, South Africa.
- Source
- Am J Gastroenterol, 1996 Jul, 91:7, 1450-2
- Abstract
- Brown bowel syndrome is a rare condition characterized by deposition of
lipofuscin in the smooth muscle cells of the gastrointestinal tract. The number
of reported cases is small, but all are associated with malabsorptive states.
Despite these small numbers, there is considerable evidence that vitamin E
deficiency is important etiologically. We report here the case of a severely
malnourished [body mass index 11.7 kg/m (2): normal range 20-25 kg/m (2)]
31-yr-old black male with a longstanding history of alcohol abuse, who was on
anti-tuberculosis therapy. The patient presented with an acute abdomen and was
found, at operation, to have a mid-ileal intussusception. Histological
examination of the resected specimen demonstrated lipofuscin accumulation
consistent with brown bowel syndrome, but no tumor. Subsequent investigations
revealed no significant quantities of vitamin E in the blood and pancreatic
steatorrhea. However, deficiency of other fat-soluble (vitamin A and D) and
water-soluble vitamins (vitamin C and thiamine) also were detected. This report
supports the association of brown bowel syndrome with vitamin E deficiency but
cannot exclude the compounding effects of protein calorie malnutrition, multiple
vitamin deficiencies, and chronic alcohol toxicity.
- Language of Publication
- English
- Unique Identifier
- 96280524
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- MeSH Heading (Major)
- Ileal Diseases|DI/*ET/SU; Intussusception|DI/*ET/SU; Lipofuscin|*ME;
Malabsorption Syndromes|*CO/DI; Nutrition Disorders|*CO/DI
- MeSH Heading
- Abdomen, Acute|DI/ET/SU; Adult; Alcoholism|CO; Case Report; Human; Male;
Vitamin E Deficiency|CO/DI
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW OF REPORTED CASES
- ISSN
- 0002-9270
- Country of Publication
- UNITED STATES
Record 6 from database: MEDLINE
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- Title
- Vitamin supplementation therapy in the elderly.
- Author
- Thurman JE; Mooradian AD
- Address
- Department of Internal Medicine, St Louis University Medical School,
Missouri, USA.
- Source
- Drugs Aging, 1997 Dec, 11:6, 433-49
- Abstract
- Vitamin supplementation in large dosages is increasingly common in the older
population. Often, such supplementation is used in an attempt to improve an
individual's health status. There have been claims that the effects of vitamins
halt the normal aging process or prevent and cure disease. However, several
recent studies have failed to demonstrate the efficacy of vitamin
supplementation in preventing several types of cancer. In moderate dosages,
supplementation with vitamin E (tocopherols) shows promise as a lipid
antioxidant, and may reduce the risk of coronary heart disease. However, before
vitamin E becomes an accepted medical therapy, further long term studies must be
undertaken to examine the safety and efficacy of such therapy. An adequate
intake of vitamins should be ensured by adherence to a well balanced diet.
However, the elderly are prone to circumstances that may prevent them from
eating a balanced diet. In addition, there are several age-related medical
conditions that may predispose individuals to dietary and vitamin deficiencies.
To prevent vitamin deficiency diseases and their associated morbidity, modest
vitamin supplementation may be necessary. However, supplementation should be
reserved for individuals with documented deficiency or who are at risk of
developing such deficiencies, especially those who are homebound or
institutionalised. Vitamins taken in large dosages should be considered as
drugs. These medicines, which are obtainable over-the-counter, should be
carefully regulated to prevent toxicity.
- Language of Publication
- English
- Unique Identifier
- 98075622
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- MeSH Heading (Major)
- Dietary Supplements|*; Vitamins|AE/*TU
- MeSH Heading
- Adult; Aged; Aged, 80 and over; Aging|DE; Antioxidants|TU; Ascorbic Acid|TU;
Avitaminosis|DT; Carotenoids|TU; Drug Interactions; Human; Middle Age;
Retinoids|TU; Vitamin B Complex|TU; Vitamin D|TU; Vitamin E|TU; Vitamin K|TU
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 1170-229X
- Country of Publication
- NEW ZEALAND
Record 7 from database: MEDLINE
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- Title
- Mechanistic considerations in chemopreventive drug development.
- Author
- Kelloff GJ; Boone CW; Steele VE; Fay JR; Lubet RA; Crowell JA; Sigman CC
- Address
- Chemoprevention Branch, Division of Cancer Prevention and Control (DCPC),
National Cancer Institute (NCI), Bethesda, MD 20892, USA.
- Source
- J Cell Biochem Suppl, 1994, 20:, 1-24
- Abstract
- This overview of the potential mechanisms of chemopreventive activity will
provide the conceptual groundwork for chemopreventive drug discovery, leading to
structure-activity and mechanistic studies that identify and evaluate new
agents. Possible mechanisms of chemopreventive activity with examples of
promising agents include carcinogen blocking activities such as inhibition of
carcinogen uptake (calcium), inhibition of formation or activation of carcinogen
(arylalkyl isothiocyanates, DHEA, NSAIDs, polyphenols), deactivation or
detoxification of carcinogen (oltipraz, other GSH-enhancing agents), preventing
carcinogen binding to DNA (oltipraz, polyphenols), and enhancing the level or
fidelity of DNA repair (NAC, protease inhibitors). Chemopreventive antioxidant
activities include scavenging reactive electrophiles (GSH-enhancing agents),
scavenging oxygen radicals (polyphenols, vitamin E), and inhibiting arachidonic
acid metabolism (glycyrrhetinic acid, NAC, NSAIDs, polyphenols, tamoxifen).
Antiproliferation/antiprogression activities include modulation of signal
transduction (glycyrrhetinic acid, NSAIDs, polyphenols, retinoids, tamoxifen),
modulation of hormonal and growth factor activity (NSAIDs, retinoids,
tamoxifen), inhibition of aberrant oncogene activity (genistein, NSAIDs,
monoterpenes), inhibition of polyamine metabolism (DFMO, retinoids, tamoxifen),
induction of terminal differentiation (calcium, retinoids, vitamin D3),
restoration of immune response (NSAIDs, selenium, vitamin E), enhancing
intercellular communication (carotenoids, retinoids), restoration of tumor
suppressor function, induction of programmed cell death (apoptosis) (butyric
acid, genistein, retinoids, tamoxifen), correction of DNA methylation imbalances
(folic acid), inhibition of angiogenesis (genistein, retinoids, tamoxifen),
inhibition of basement membrane degradation (protease inhibitors), and
activation of antimetastasis genes. A systematic drug development program for
chemopreventive agents is only possible with continuing research into mechanisms
of action and thoughtful application of the mechanisms to new drug design and
discovery. One approach is to construct pharmacological activity profiles for
promising agents. These profiles are compared among the promising agents and
with untested compounds to identify similarities. Classical structure-activity
studies are used to find optimal agents (high efficacy with low toxicity) based
on good lead agents. Studies evaluating tissue-specific and pharmacokinetic
parameters are very important. A final approach is design of mechanism-based
assays and identification of mechanism-based intermediate biomarkers for
evaluation of chemopreventive efficacy.
- Language of Publication
- English
- Unique Identifier
- 95341856
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- MeSH Heading (Major)
- Anticarcinogenic Agents|ME/*PD/*TU; Neoplasms|ME/*PC; Neoplasms,
Experimental|ME/*PC
- MeSH Heading
- Animal; Human; Mice; Rats
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0733-1959
- Country of Publication
- UNITED STATES
Record 8 from database: MEDLINE
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- Title
- Susceptibility to alcohol-related liver injury.
- Author
- Lieber CS
- Address
- Alcohol Research and Treatment Center, Bronx Veterans Affairs Medical
Center, New York, USA.
- Source
- Alcohol Alcohol Suppl, 1994, 2:, 315-26
- Abstract
- Alcohol affects the liver through metabolic disturbances associated with its
oxidation. Redox changes produced by the hepatic alcohol dehydrogenase pathway
affect lipid, carbohydrate and protein metabolism. Ethanol is also oxidized in
liver microsomes by the ethanol-inducible cytochrome P4502E1, resulting in
ethanol tolerance and selective hepatic perivenular damage. Furthermore, P4502E1
activates various xenobiotics, explaining the increased susceptibility of the
heavy drinker to the toxicity of anesthetics, commonly used medications (i.e.
isoniazid), analgesics (i.e. acetaminophen), and chemical carcinogens. Induction
of microsomal enzymes also contributes to vitamin A depletion, enhances its
hepatotoxicity and results in increased acetaldehyde generation from ethanol,
with formation of protein adducts, glutathione depletion, free-radical-mediated
toxicity, and lipid peroxidation. Chronic ethanol consumption strikingly
enhances the number of hepatic collagen-producing activated lipocytes. Both in
vivo (in our baboon model of alcoholic cirrhosis) and in vitro (in cultured
myofibroblasts and activated lipocytes) ethanol and/or its metabolite
acetaldehyde increase collagen accumulation and mRNA for collagen. Gender
differences are related, in part, to lower gastric ADH activity (with consequent
reduction of first pass ethanol metabolism) in young women, decreased hepatic
fatty acid binding protein and increased free-fatty acid levels as well as
lesser omega-hydroxylation, all of which result in increased vulnerability to
ethanol. Elucidation of the biochemical effects of ethanol are now resulting in
improved therapy: in baboons, S-adenosyl-L-methionine attenuates the
ethanol-induced glutathione depletion and associated mitochondrial lesions, and
polyenylphosphatidylcholine opposes the ethanol-induced hepatic phospholipid
depletion, the decrease in phosphatidylethanolamine methyltransferase activity
and the activation of hepatic lipocytes, with full prevention of ethanol-induced
septal fibrosis and cirrhosis; its dilinoleoyl species also increases
collagenase activity in lipocytes. The efficacy of this compound in man is now
being studied in randomized multicenter clinical trials.
- Language of Publication
- English
- Unique Identifier
- 97129894
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- MeSH Heading (Major)
- Ethanol|ME/*TO; Liver|*DE/*IN/ME
- MeSH Heading
- Acetaldehyde|ME; Age Factors; Alcohol Dehydrogenase|ME; Aldehyde
Dehydrogenase|ME; Animal; Catalase|ME; Cytokines|PH; Female; Hepatitis, Viral,
Human|CO; Human; In Vitro; Liver Diseases, Alcoholic|ET/GE/ME; Male; Microsomes,
Liver|ME; Nutrition; Oxidation-Reduction; Papio; Sex Factors; Support, U.S.
Gov't, Non-P.H.S.; Support, U.S. Gov't, P.H.S.
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, ACADEMIC
- ISSN
- 1358-6173
- Country of Publication
- ENGLAND
Record 9 from database: MEDLINE
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- Title
- Deciphering the cause of Friedreich ataxia.
- Author
- Koenig M; Mandel JL
- Address
- Institut de GÆenÆetique et Biologie MolÆeculaire et Cellulaire (IGBMC),
INSERM, CNRS, UniversitÆe Louis Pasteur, Strasbourg, France.
mkoenig@igbmc.u-strasbg.fr
- Source
- Curr Opin Neurobiol, 1997 Oct, 7:5, 689-94
- Abstract
- Friedreich ataxia (FA), the most frequent cause of recessive ataxia, is
attributable, in most cases, to a large expansion of an intronic GAA repeat,
resulting in decreased expression of the target frataxin gene. This gene encodes
a novel mitochondrial protein that has homologues of unknown function in yeast
and even in gram-negative bacteria. Yeast deficient in the frataxin homologue
accumulate iron in their mitochondria and show increased sensitivity to
oxidative stress. This finding suggests that FA patients suffer from a
mitochondrial dysfunction that causes free-radical toxicity, reminiscent of the
clinically similar ataxia caused by inherited isolated vitamin E deficiency.
- Language of Publication
- English
- Unique Identifier
- 98045996
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- MeSH Heading (Major)
- Friedreich's Ataxia|*GE/ME/PP
- MeSH Heading
- Animal; Human; Phosphotransferases (Alcohol Group Acceptor)|GE/ME/PH;
Support, Non-U.S. Gov't; Vitamin E Deficiency|PP
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0959-4388
- Country of Publication
- ENGLAND
Record 10 from database: MEDLINE
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Menu Position #10
- Title
- Magnesium and therapeutics.
- Author
- Durlach J; Durlach V; Bac P; Bara M; Guiet Bara A
- Address
- SDRM, HÈopital St. Vincent-de-Paul, Paris, France.
- Source
- Magnes Res, 1994 Dec, 7:3-4, 313-28
- Abstract
- Two different types of therapy with magnesium are used: physiological oral
magnesium supplementation which is totally atoxic since it palliates magnesium
deficiencies by simply normalizing the magnesium intake and pharmacological
magnesium therapy which may induce toxicity since it creates iatrogenic
magnesium overload. Primary and secondary magnesium deficiencies constitute the
sole indication of physiological oral magnesium therapy. It is therefore
necessary to be well acquainted with the clinical and paraclinical pattern of
magnesium deficit and to discriminate between magnesium deficiency due to an
insufficient magnesium intake which only requires oral physiological
supplementation and magnesium depletion related to a dysregulation of the
control mechanisms of magnesium status which requires more or less specific
regulation of its causal dysregulation. Physiological oral magnesium load
constitutes the best tool for diagnosis of magnesium deficiency and the first
step of its treatment. Physiological oral magnesium supplementation (5
mg/kg/day) is easy and can be carried out in the diet or with magnesium salts,
with practically only one contra-indication: overt renal failure. Specific and
aspecific treatments of magnesium depletion are tricky using for example
magnesium sparing diuretics, pharmacological doses of vitamin B6, physiological
doses of vitamin D and of selenium. In order to use the pharmacological
properties of induced therapeutic hypermagnesaemia, high oral doses of magnesium
(> 10 mg/kg/day) are advisable for chronic indications and the parenteral
route is suitable for acute indications. There are 3 types of indications:
specific (for the treatment of some forms of magnesium deficit i.e. acute),
pharmacological (i.e. without alterations of magnesium status) and
mixed--pharmacological and aetiopathogenic--(for example complications of
chronic alcoholism). Today pharmacological magnesium therapy mainly concerns the
obstetrical, cardiological and anaesthesiological fields. The main indications
are eclampsia, some dysrhythmias (torsades de pointe particularly) and
myocardial ischaemias. But it is now difficult to situate the exact place of the
pharmacological indications of magnesium. Magnesium infusions can only be
envisaged in intensive care units with careful monitoring of pulse, arterial
pressure, deep tendon reflexes, hourly diuresis, electrocardiogram and
respiratory recordings. High oral magnesium doses besides their laxative action
may bring latent complications which may reduce lifespan. There may remain some
indications of the laxative and antacid properties of non soluble magnesium,
particularly during intermittent haemodialysis. Lastly local use of the
mucocutaneous and cytoprotective properties of magnesium is still valid, in
cardioplegic solutions and for preservation of transplants particularly.
- Language of Publication
- English
- Unique Identifier
- 95306269
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Menu Position #10
- MeSH Heading (Major)
- Magnesium|AD/AE/CT/*TU
- MeSH Heading
- Administration, Oral; Clinical Trials; Diagnosis, Differential; Diet; Drug
Interactions; Female; Gastrointestinal Diseases|DT; Human; Kidney Failure;
Magnesium Deficiency|DI/DT; Pregnancy; Pregnancy Complications|DT
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, ACADEMIC
- ISSN
- 0953-1424
- Country of Publication
- ENGLAND
Record 11 from database: MEDLINE
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- Title
- The toxicity of air pollution in experimental animals and humans: the role
of oxidative stress.
- Author
- Menzel DB
- Address
- Department of Community and Environmental Medicine, University of
California, Irvine 92717.
- Source
- Toxicol Lett, 1994 Jun, 72:1-3, 269-77
- Abstract
- Nitrogen dioxide (NO2) and ozone (O3) occur throughout the world as the
primary pollutants of urban air. NO2 and O3 oxidize cell membrane lipids and
proteins. Inflammatory agents are elaborated from the lung either as a direct
result of oxidation or as a consequence of leukocytes recruited into the lung by
injury. My hypothesis is that NO2 and O3 initiate or exacerbate chronic lung
disease through an inflammatory mechanism which can be reduced by
supplementation with greater amounts than those required to alleviate vitamin
deficiency symptoms of vitamins C (ascorbic acid) and E (alpha-tocopherol).
Children, whose lungs are developing, are the most likely group to benefit from
supplementation with vitamins C and E because the adverse effects of
inflammation on the developing lung are likely to be greater and the time of
exposure is longer than in adults. This hypothesis is in accord with current
human and experimental animal data and the chemistry of O3 and NO2 toxicity, and
is supported by recent ecological epidemiological studies of persons
supplementing their intake of vitamins C and E.
- Language of Publication
- English
- Unique Identifier
- 94262080
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- MeSH Heading (Major)
- Air Pollutants, Environmental|AE/*TO; Lung Diseases|*CI/ME; Nitrogen
Dioxide|AE/*TO; Ozone|AE/*TO; Stress|*CI/ME/*PP
- MeSH Heading
- Animal; Chronic Disease; Human; Oxidation-Reduction
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0378-4274
- Country of Publication
- NETHERLANDS
Record 12 from database: MEDLINE
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- Title
- Tretinoin tocoferil as a possible differentiation-inducing agent against
myelomonocytic leukemia.
- Author
- Makishima M; Honma Y
- Address
- Department of Chemotherapy, Saitama Cancer Center Research Institute,
Ina-machi, Japan.
- Source
- Leuk Lymphoma, 1997 Jun, 26:1-2, 43-8
- Abstract
- Tretinoin tocoferil is an alpha-tocopherol ester of all-trans retinoic acid
(ATRA) and safely used to treat skin ulcers. Tretinoin tocoferil stimulates the
formation of granulation tissue in the ulcer, and enhances the migration of
guinea pig macrophages and stimulates the proliferation of human skin
fibroblasts. These effects are different from those of either ATRA or
alpha-tocopherol. Tretinoin tocoferil induces the granulocytic differentiation
of human promyelocytic leukemia HL-60 cells, and more than additively enhances
cellular differentiation induced by sub-optimal concentrations of ATRA.
Tretinoin tocoferil and ATRA synergistically inhibit the proliferation of HL-60
cells, suggesting that tretinoin tocoferil acts differently than ATRA on
leukemia cells. Tretinoin tocoferil also enhances the differentiation of HL-60
cells induced by dimethyl sulfoxide, phorbol ester and
1alpha,25-dihydroxyvitamin D3(VD3). Tretinoin tocoferil and VD3 synergistically
inhibit the proliferation and induce the differentiation of other myelomonocytic
leukemia cells. Toxicity tests in animal models have shown that tretinoin
tocoferil is at least 150 times less toxic than ATRA and does not induce
teratogenesis. Therefore, the combination of tretinoin tocoferil and VD3 may be
useful for treating myelomonocytic leukemia.
- Language of Publication
- English
- Unique Identifier
- 97392572
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- MeSH Heading (Major)
- Antineoplastic Agents|*TU; Leukemia, Myelomonocytic, Acute|*DT;
Tretinoin|*AA/TU; Vitamin E|*AA/TU
- MeSH Heading
- Cell Differentiation|DE; Drug Combinations; Human; Support, Non-U.S. Gov't
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 1042-8194
- Country of Publication
- SWITZERLAND
Record 13 from database: MEDLINE
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- Title
- Hepatic side-effects of antibiotics.
- Author
- Westphal JF; Vetter D; Brogard JM
- Address
- Internal Medicine Service, Medical B Clinic, 1 place de l'HÈopital, CHRU,
Strasbourg, France.
- Source
- J Antimicrob Chemother, 1994 Mar, 33:3, 387-401
- Abstract
- Although the liver is particularly exposed to drugs and their metabolites,
hepatic side-effects of antibiotics are far less frequent than other adverse
effects such as gastrointestinal disorders or cutaneous reactions. However, the
potential severity of hepatic side-effects for some drugs is stressed.
Antibiotic related liver injuries cover most of the clinical and pathological
expressions of hepatic dysfunction, including cytotoxic hepatitis (isoniazid),
intrahepatic cholestasis (macrolides, penicillins, clavulanic acid), mixed
hepatitis (sulphonamides), chronic active hepatitis (nitrofurantoin), or
microvesicular steatosis (tetracycline). In most cases, toxicity is
idiosyncratic, reactions occurring only in some susceptible individuals. The
mechanisms underlying toxicity may be primarily metabolite-dependent
(isoniazid), hypersensitivity-mediated (beta-lactams), or result from both
processes (sulphonamides, erythromycin derivatives). In some cases, the liver is
not the primary target organ for toxicity but appears to mediate the clinical
expression of some adverse effects induced by antibiotics. The most significant
example of this is hypoprothrombinaemia due to the inhibition of hepatic
gamma-carboxylation of vitamin K-dependent clotting factors by sulphydryl
group-containing cephalosporins. Inhibition of bilirubin conjugation or
transport by rifampicin or fusidic acid may also be viewed as hepatic
side-effects of antibiotics. Ascertaining the casual relationship of a given
drug to an hepatic adverse effect may prove particularly difficult, because of
the potential contribution of host status and concurrent medications. Diagnosis
is based mainly on circumstantial evidence, i.e. the temporal relationship
between drug administration (or withdrawal) and the time-course of liver
dysfunction. Improving morbidity related to drug hepatotoxicity relies on a free
flow of information between manufacturers and practitioners in order to optimize
detection of potentially serious liver damage, and advances in pharmacogenetics
toward a better identification of those at particular risk for developing
drug-related liver toxicity.
- Language of Publication
- English
- Unique Identifier
- 94314687
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- MeSH Heading (Major)
- Antibiotics|*AE/TO; Liver|*DE
- MeSH Heading
- Animal; Antibiotics, Lactam|AE; Antitubercular Agents|AE; Human;
Sulfonamides|AE
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0305-7453
- Country of Publication
- ENGLAND
Record 14 from database: MEDLINE
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- Title
- Cancer of the prostate: a nutritional disease?
- Author
- Fair WR; Fleshner NE; Heston W
- Address
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY
10021, USA.
- Source
- Urology, 1997 Dec, 50:6, 840-8
- Abstract
- In summary, epidemiologic and laboratory evidence increasingly demonstrate
that nutritional factors, especially reduced fat intake, soy proteins, vitamin E
derivatives, and selenium, may have a protective effect against prostate cancer.
The experimental observation that low-fat diets and soy protein extracts may
influence the progression of established tumors, rather than inhibiting
etiologic factors, is particularly intriguing because it may serve to help
explain the paradox whereby the incidence of clinical prostate cancer shows wide
geographic variation, yet the evidence persists that the incidence of microfocal
tumors is essentially the same worldwide. These observations, plus the
likelihood that nutrition trials are likely to have little in the way of
toxicity that would preclude their completion, argue that such trials should be
performed. It is estimated that 30% to 50% of human malignancies may be related
to dietary factors, and although the feasibility of trials involving low-fat
diets has been proved in ongoing trials for colon and breast cancer, no similar
study exists for prostate malignancy. Critics of epidemiologic research argue
that data derived from case-control studies are subject to recall bias and are
thus artifactual. Indeed, many researchers now believe that the breast
cancer-dietary fat hypothesis has been discredited. The major difference between
the prostate cancer and breast cancer literature is the remarkable consistency
of the cohort studies. In these studies, exposure is determined prospectively
and is therefore free from recall bias. In this sense they more closely resemble
a clinical trial. The majority of cohort studies involving dietary fat and
breast cancer have been negative. We believe that these data justify large-scale
trials in the area of prevention of prostate cancer. One such proposed study
already submitted for National Institutes of Health funding from a consortium of
centers is the Prostate Interventional Nutrition Study (PINS), modeled after the
Women's Interventional Nutrition Study, which investigates the effect of low-fat
diets in women receiving therapy for node-positive breast cancer. The PINS study
will be limited to men who have detectable serum PSA levels but no other
clinical evidence of disease after radical prostatectomy. All subjects will
receive nutritional guidance, with randomization between a control arm receiving
the currently recommended 30% fat diet and an interventional arm in which a 15%
fat diet is supplemented with soy protein, vitamin E, and selenium. The end
points for evaluation will be compared with progression based on changes in PSA
and the time of onset of clinical, as opposed to biochemical, disease.
Single-institution trials involving groups thought to be at high risk of
developing clinical cancer--including men with persistently elevated PSA levels,
two negative prostate biopsies, high-grade prostatic intraepithelial neoplasia
on biopsy, and a strong family history of prostate cancer--are being initiated
at MSKCC and other institutions. CONCLUSIONS: We have reviewed the evidence that
nutritional factors play a role in the progression rate of prostate cancer and
may help to explain the geographic variation in the incidence observed. However,
without well-controlled prospective trials, the attractive hypothesis that
nutrition plays a role in tumor progression remains simply an attractive
hypothesis. To date, no definite proof of a preventive effect has been shown in
a study that will withstand rigid scientific scrutiny. The opportunity exists,
however, for the urologic community, working together with experts in the area
of nutrition, not only to advance our understanding of prostate tumorigenesis,
but to rebut those critics of modern medical technology who claim that we have
ignored the total or holistic approach to healing. (ABSTRACT TRUNCATED)
- Language of Publication
- English
- Unique Identifier
- 98088117
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- MeSH Heading (Major)
- Carcinoma|ET/*ME; Nutrition Disorders|CO/*ME; Prostatic Neoplasms|ET/*ME
- MeSH Heading
- Animal; Animal Nutrition; Comparative Study; Diet|AE; Human; Male; Nutrition
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0090-4295
- Country of Publication
- UNITED STATES
Record 15 from database: MEDLINE
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- Title
- Effect of calcium channel blockers on intracellular calcium accumulation.
- Author
- Haag Weber M; Hörl WH
- Address
- Department of Medicine, University of Vienna, Austria.
- Source
- Nephrol Dial Transplant, 1994, 9 Suppl 3:, 24-7
- Abstract
- Protection against acute renal failure by calcium channel blockers include
radiocontrast agent, cyclosporin, aminoglycosides, amphotericin B, cisplatin
nephrotoxicity, and ischaemia-induced toxicity. Calcium overload occurs in
ischaemic cells. The type of calcium channel blocker influences the potential
effect on protection against nephrotoxicity. A number of growth factors and
hormones induce cellular activation by increasing calcium concentrations.
Calcium channel blockers interfere with activation of different cell types, e.g.
decrease platelet aggregation, macrophage activation, platelet-activating factor
release and also proliferative response of vascular smooth muscle and mesangial
cells. Uraemia is also a state of calcium accumulation. Increase of
intracellular calcium [Ca2+]i in PMNLs is associated with deactivation.
Treatment with calcium channel blockers normalizes elevated PMNL [Ca2+]i and
improves functional parameters of PMNLs. Normalization of enhanced [Ca2+]i of
PMNLs can also be achieved with effective 1,25(OH)2 vitamin D3 therapy by
lowering PTH. Uraemia is also a state of insulin resistance. Elevated levels of
[Ca2+]i in insulin target cells diminish sensitivity to insulin at the
postbinding site. Therapeutic manoeuvres preventing the increase of cytosolic
calcium may improve insulin resistance.
- Language of Publication
- English
- Unique Identifier
- 94352613
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- MeSH Heading (Major)
- Calcium|*ME/PO; Calcium Channel Blockers|*PD; Intracellular Membranes|DE/*ME
- MeSH Heading
- Animal; Human; Kidney Failure, Acute|PC; Uremia|ME
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0931-0509
- Country of Publication
- ENGLAND
Record 16 from database: MEDLINE
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- Title
- Effectiveness of beta-carotene in cancer chemoprevention.
- Author
- Toma S; Losardo PL; Vincent M; Palumbo R
- Address
- National Institute for Cancer Research-IST, Genova, Italy.
- Source
- Eur J Cancer Prev, 1995 Jun, 4:3, 213-24
- Abstract
- This article reviews the current knowledge on the cancer-preventive
potential of beta-carotene, a precursor of vitamin A, and plentiful in fruits
and vegetables, which has been studied widely as a promising chemopreventive
agent in reducing the risk of cancer in humans. Several retrospective and
prospective epidemiological investigations have demonstrated that a diet rich in
micronutrients such as vitamins, carotenoids and selenium, could prevent the
arising, in 'high-risk' patients, of precancerous and neoplastic lesions of
specific sites, particularly of the upper aerodigestive tract. Numerous in vitro
expressions have been performed in order to verify the true role played by this
agent on cell proliferation and differentiation; until now, findings have been
very encouraging, uniformly showing the beta-carotene can affect carcinogenesis,
particularly in early stages, through an antigenotoxic action. Antioxidant
functions, immunomodulatory effects and control of intercellular messages via
gap junctions are possible action mechanisms of the ability of beta-carotene to
block the carcinogenetic process. In vivo animal studies partially confirm the
results obtained in vitro showing that beta-carotene is able to reduce the
induce cancer development; moreover, the association of the carotenoid with
other microelements, such as vitamins E, C and glutathione often appears to be
more effective than each agent used alone. From a clinical point of view,
beta-carotene appears an 'ideal' agent to be used in chemoprevention trials in
humans, although optimal doses and intake methods need to be better defined; its
almost zero toxicity permits the long-term administration of the drug, a vital
condition for its anti-cancer activity, with good patient compliance. Human
intervention studies performed so far, both randomized and uncontrolled clinical
trials, have showed positive findings in specific cancer sites such as oral
cavity, head and neck and colon; less consistent or negative are results on
skin, lung and oesophagus cancer. The ongoing studies will provide more answer
on these issues. A definitive evaluation of the ability of beta-carotene to
prevent cancer in human requires further controlled trials; studies on a larger
spectrum of cancer sites and different stages of disease must be encouraged. In
addition, further investigation on biomarkers related to cancer risk and cancer
incidence are necessary, particularly focused on the measurements for genotoxic
damage, eg micronuclei, that may provide a valid and 'easy' marker for early
stage carcinogenesis.
- Language of Publication
- English
- Unique Identifier
- 95375669
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- MeSH Heading (Major)
- Antineoplastic Agents|*TU; Carotene|*TU; Neoplasms|ET/*PC
- MeSH Heading
- Animal; Diet; Human; Neoplasms, Experimental|PC; Risk Factors
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0959-8278
- Country of Publication
- ENGLAND
Record 17 from database: MEDLINE
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- Title
- Treatment of refractory cutaneous lupus erythematosus.
- Author
- Duna GF; Cash JM
- Address
- Cleveland Clinic Foundation, Ohio, USA.
- Source
- Rheum Dis Clin North Am, 1995 Feb, 21:1, 99-115
- Abstract
- Photoprotection, topical steroids, and hydroxychloroquine are the mainstays
of therapy of cutaneous LE. In severe and/or refractory disease, antimalarials
remain the drugs of choice, and multiple induction and combination strategies
can be employed to achieve optimal results with minimal toxicity. Retinoids,
dapsone, clofazimine, and thalidomide are effective but more toxic alternatives.
Their use dictates frequent and careful monitoring. Retinoids and thalidomide
are teratogenic, and thalidomide is not available in the United States. Results
with vitamin E are controversial. Gold and IFN-alpha have unacceptably high risk
to benefit ratios. Cytotoxic agents are generally restricted to the patients
with concomitant organ-threatening systemic disease.
- Language of Publication
- English
- Unique Identifier
- 95249764
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- MeSH Heading (Major)
- Lupus Erythematosus, Cutaneous|*TH
- MeSH Heading
- Human
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0889-857X
- Country of Publication
- UNITED STATES
Record 18 from database: MEDLINE
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- Title
- P-glycoprotein functions and substrates: possible roles of MDR1 gene in the
kidney.
- Author
- Ernest S; Bello Reuss E
- Address
- Department of Internal Medicine, University of Texas Medical Branch,
Galveston, USA.
- Source
- Kidney Int Suppl, 1998 Apr, 65:, S11-7
- Abstract
- There is a renewed attention on the multidrug resistance genes and their
products, P-glycoproteins, since recent molecular and functional studies
revealed unexpected functions in normal tissues. There are two types of human
P-glycoprotein: Type I, encoded by the MDR1 gene, present in excretory organs
and in non-polarized cells; and Type II, encoded by MDR2, present in the
canalicular membrane of hepatocytes. MDR1 Pgp transports xenobiotics, peptides,
steroids, and phospholipids, and is also a regulator of swelling-activated
chloride channels. MDR2 Pgp is exclusively a phosphatidylcholine translocase. In
the kidney, the MDR1 gene and protein are expressed in mesangial, proximal
tubule, thick loop of Henle, and collecting duct cells. In mesangial and
proximal tubule cells Pgp transports xenobiotics. Concomitant exposure of kidney
cells to two Pgp substrates results in increased cell toxicity. Extracts from
supernatants of mesangial cell cultures inhibit Pgp-mediated transport,
suggesting that a mesangial-cell metabolite could be a substrate of Pgp. Active
vitamin D3 and platelet activating factor inhibit Pgp transport and are possible
endogenous substrates in proximal tubule and mesangial cells, respectively. Pgp
could be also a regulator of swelling-activated chloride channels present in the
kidney.
- Language of Publication
- English
- Unique Identifier
- 98212790
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- MeSH Heading (Major)
- Kidney|*ME; P-Glycoprotein|*GE/*PH
- MeSH Heading
- Animal; Biological Transport; Human; Interleukin-2|ME; Steroids|ME; Support,
Non-U.S. Gov't; Support, U.S. Gov't, P.H.S.; Xenobiotics|PK
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0098-6577
- Country of Publication
- UNITED STATES
Record 19 from database: MEDLINE
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- Title
- Bioactivities of N-(4-hydroxyphenyl) retinamide and retinoyl
beta-glucuronide.
- Author
- Formelli F; Barua AB; Olson JA
- Address
- Istituto Nazionale per lo Studio e la Cura dei Tumori, Division of
Experimental Oncology, Milan, Italy.
- Source
- FASEB J, 1996 Jul, 10:9, 1014-24
- Abstract
- N-(4-Hydroxyphenyl) retinamide (4HPR) and retinoyl beta-glucuronide (RAG)
are two derivatives of all-trans retinoic acid (RA) that show properties both
similar to as well as different from their parent compound, RA. Both retinoids
possess the important property of showing much-reduced toxicity relative to RA
while maintaining significant biological activity. 4HPR, a synthetic derivative,
is active in the prevention and treatment of a variety of neoplasms in animals,
and by inducing apoptosis, shows growth inhibitory activity against many human
tumor cell types in vitro. In humans, 4HPR reduces the incidence of new
occurrences of leukoplakia and is currently being tested as a preventive agent
for breast cancer. RAG, a naturally occurring metabolite of RA, effectively
stimulates the growth of vitamin A-deficient animals, induces the
differentiation of epithelial cells in vivo and in vitro, and is effective in
the topical treatment of acne in humans. Unlike RA, RAG is nontoxic when applied
to the skin and is nonteratogenic when given orally to rats. Possible mechanisms
of action of both compounds are discussed. These two derivatives of retinoids
show interesting physiologic effects and potentially beneficial pharmacologic
actions.
- Language of Publication
- English
- Unique Identifier
- 96388956
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- MeSH Heading (Major)
- Fenretinide|*PD; Tretinoin|*AA/PD
- MeSH Heading
- Animal; Antineoplastic Agents|PD; Cell Differentiation|DE; Human; Rats;
Support, Non-U.S. Gov't; Support, U.S. Gov't, Non-P.H.S.; Support, U.S. Gov't,
P.H.S.
- Publication Type
- JOURNAL ARTICLE; REVIEW; REVIEW, TUTORIAL
- ISSN
- 0892-6638
- Country of Publication
- UNITED STATES
Record 20 from database: MEDLINE
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- Title
- Safety of megavitamin therapy.
- Author
- Omaye ST
- Address
-
- Source
- Adv Exp Med Biol, 1984, 177:, 169-203
- Abstract
- Carbon compounds that are needed in small amounts in the diet because they
are not made in the body of vertebrates are defined as vitamins. Excluded from
this definition are vitamins D, K, and niacin which can be synthesized by the
organism or, as in the case of vitamin K, by the host's intestinal bacteria.
Lack of such vitamins can result in characteristic deficiency diseases. The
therapeutic use of such compounds (megavitamin intake) is based on the
spectacular effect of vitamins on deficiency diseases; however, evidence that
the ingestion of large amounts of vitamins beyond the "Recommended Daily
Allowances" (RDA) is beneficial is not within the basic concept of
nutrition. Vitamins, like many substances, may be toxic when taken in large
quantities, especially the fat-soluble vitamins, and the concept of "more
is better" is a common misconception. Vitamin supplements can be suggested
only in the unusual cases of patients having inadequate intake, disturbed
absorption (genetic or otherwise), or increased tissue requirements. A
well-balanced diet that includes a wide variety of foods from each of the four
food groups is adequate for the supply of vitamins, as well as other nutrients,
in healthy people. This paper will review some of the recent findings regarding
vitamin toxicity and the mechanisms of toxicity.
- Language of Publication
- English
- Unique Identifier
- 85043289
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- MeSH Heading (Major)
- Orthomolecular Therapy|AE/*ST
- MeSH Heading
- Ascorbic Acid|TO/TU; Drug Interactions; Human; Vitamin A|TO/TU; Vitamin B
Complex|TO/TU; Vitamin D|TO/TU; Vitamin E|TO/TU; Vitamin K|TO/TU
- Publication Type
- JOURNAL ARTICLE; REVIEW
- ISSN
- 0065-2598
- Country of Publication
- UNITED STATES
- CAS Registry/EC Number
- 11103-57-4 (Vitamin A); 12001-76-2 (Vitamin B Complex); 12001-79-5 (Vitamin
K); 1406-16-2 (Vitamin D); 1406-18-4 (Vitamin E); 50-81-7 (Ascorbic Acid)
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