Medical Forum / Diseases and Disorders / Alzheimer's / September 2008
Antioxidant Depletion In Cognitive Impairment
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ironjustice - 12 Sep 2008 19:58 GMT Peripheral oxidative damage in mild cognitive impairment and mild Alzheimer's disease. Baldeiras I, Santana I, Proença MT, Garrucho MH, Pascoal R, Rodrigues A, Duro D, Oliveira CR J Alzheimers Dis 2008 Sep; 15(1):117-28.
Oxidative stress has been shown to be a triggering event in the pathogenesis of Alzheimer's disease (AD). However, little evidence exists on the role of oxidative imbalance in Mild Cognitive Impairment (MCI), a group with a high risk of progression to AD. We therefore assessed the peripheral blood levels of a broad spectrum of non-enzymatic and enzymatic antioxidant defenses, as well as lipid and protein oxidation markers and nitrogen oxidative species in 85 MCI patients, 42 mild AD patients and 37 age-matched controls. In mild AD patients, the plasma levels of vitamin E were significantly decreased, while the plasma concentration of oxidized glutathione was increased in both MCI and mild AD patients. An increase in plasmatic and erythrocytes oxidative markers was also observed in MCI and mild AD patients as compared to controls. In both patients groups, increased levels of plasma antioxidants were found in females, whereas apolipoprotein E epsilon4 allele carriers showed higher indices of intracellular oxidative markers. Moreover, in MCI patients, cognitive function positively correlates with antioxidant levels. This study shows that most of the oxidative changes found in mild AD patients are already present in the MCI group, and that progression to AD might be accompanied by antioxidant depletion.
Journal of Alzheimer's disease : JAD [J Alzheimers Dis]
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California Poppy - 12 Sep 2008 23:54 GMT > Peripheral oxidative damage in mild cognitive impairment and mild > Alzheimer's disease. [quoted text clipped - 37 lines] > > DEAD PEOPLE WALKINGhttp://tinyurl.com/zk9fk Interesting study. Now if they will just follow up and tell us how to correct it....Something we take like a vitamin? Something we eat?
ironjustice - 13 Sep 2008 00:33 GMT Interesting study. Now if they will just follow up and tell us how to correct it....Something we take like a vitamin? Something we eat? <<
This study came out about the increased absorption of curcumin when taken with olive oil or vegetable oil would be a good place to start. They have shown positive effects with curcumin and that was without the addition of this enhancing absorption with oil.
"Only curcumin was effective in reducing amyloid plaque burden, insoluble beta-amyloid peptide (Abeta), and carbonyls"
"In our studies, increasing curcumin solubility with phosphatidyl choline, olive oil, or stearic acid increases plasma and brain levels compared with administering unformulated curcumin powder. Lipidated curcumin formulation resulted in 11-fold higher levels of curcumin in plasma and 4-fold higher levels in brain compared to equal doses of curcumin powder or curcumin- piperine extracts."
Whether this 'lipidated curcumin' is simply curcumin stirred in oil ?
Comparison of systemic availability of curcumin with that of curcumin formulated with phosphatidylcholine MARCZYLO Timothy H. (1) ; VERSCHOYLE Richard D. (1) ; COOKE Darren N. (1) ; MORAZZONI Paolo (2) ; STEWARD William P. (1) ; GESCHER Andreas J. (1) ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s) (1) Cancer Biomarkers and Prevention Group, Department of Cancer Studies and Molecular Medicine, University of Leicester, Robert Kilpatrick Clinical Sciences Building, Leicester Royal Infirmary, Leicester, LE2 7LX, ROYAUME-UNI (2) Indena SpA, Viale Ortles 12, 20139 Milan, ITALIE
Abstract Purpose Curcumin, a major constituent of the spice turmeric, suppresses expression of the enzyme cyclooxygenase 2 (Cox-2) and has cancer chemopreventive properties in rodents. It possesses poor systemic availability. We explored whether formulation with phosphatidylcholine increases the oral bioavailability or affects the metabolite profile of curcumin. Methods Male Wistar rats received 340 mg/kg of either unformulated curcumin or curcumin formulated with phosphatidylcholine (Meriva) by oral gavage. Rats were killed at 15, 30, 60 and 120 min post administration. Plasma, intestinal mucosa and liver were analysed for the presence of curcumin and metabolites using HPLC with UV detection. Identity of curcumin and metabolites was verified by negative ion electrospray liquid chromatography/tandem mass spectrometry. Results Curcumin, the accompanying curcuminoids desmethoxycurcumin and bisdesmethoxycurcumin, and the metabolites tetrahydrocurcumin, hexahydrocurcumin, curcumin glucuronide and curcumin sulfate were identified in plasma, intestinal mucosa and liver of rats which had received Meriva. Peak plasma levels and area under the plasma concentration time curve (AUC) values for parent curcumin after administration of Meriva were fivefold higher than the equivalent values seen after unformulated curcumin. Similarly, liver levels of curcumin were higher after administration of Meriva as compared to unformulated curcumin. In contrast, curcumin concentrations in the gastrointestinal mucosa after ingestion of Meriva were somewhat lower than those observed after administration of unformulated curcumin. Similar observations were made for curcumin metabolites as for parent compound. Conclusion The results suggest that curcumin formulated with phosphatidylcholine furnishes higher systemic levels of parent agent than unformulated curcumin. Revue / Journal Title Cancer chemotherapy and pharmacology ISSN 0344-5704 CODEN CCPHDZ Source / Source 2007, vol. 60, no2, pp. 171-177 [7 page(s) (article)] (25 ref.)
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Curcumin structure-function, bioavailability, and efficacy in models of neuroinflammation and Alzheimer's disease. Begum AN, Jones MR, Lim GP, Morihara T, Kim P, Heath DD, Rock CL, Pruitt MA, Yang F, Hudspeth B, Hu S, Faull KF, Teter B, Cole GM, Frautschy SA. Department of Medicine, University of California, Los Angeles, California, USA.
Curcumin can reduce inflammation and neurodegeneration, but its chemical instability and metabolism raise concerns, including whether the more stable metabolite tetrahydrocurcumin (TC) may mediate efficacy. We examined the antioxidant, anti-inflammatory, or anti-amyloidogenic effects of dietary curcumin and TC, either administered chronically to aged Tg2576 APPsw mice or acutely to lipopolysaccharide (LPS)-injected wild-type mice. Despite dramatically higher drug plasma levels after TC compared with curcumin gavage, resulting brain levels of parent compounds were similar, correlating with reduction in LPS-stimulated inducible nitric- oxide synthase, nitrotyrosine, F2 isoprostanes, and carbonyls. In both the acute (LPS) and chronic inflammation (Tg2576), TC and curcumin similarly reduced interleukin-1beta. Despite these similarities, only curcumin was effective in reducing amyloid plaque burden, insoluble beta-amyloid peptide (Abeta), and carbonyls. TC had no impact on plaques or insoluble Abeta, but both reduced Tris-buffered saline-soluble Abeta and phospho-c-Jun NH(2)- terminal kinase (JNK). Curcumin but not TC prevented Abeta aggregation. The TC metabolite was detected in brain and plasma from mice chronically fed the parent compound. These data indicate that the dienone bridge present in curcumin, but not in TC, is necessary to reduce plaque deposition and protein oxidation in an Alzheimer's model. Nevertheless, TC did reduce neuroinflammation and soluble Abeta, effects that may be attributable to limiting JNK-mediated transcription. Because of its favorable safety profile and the involvement of misfolded proteins, oxidative damage, and inflammation in multiple chronic degenerative diseases, these data relating curcumin dosing to the blood and tissue levels required for efficacy should help translation efforts from multiple successful preclinical models.
PMID: 18417733 PMCID: PMC2527621
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“However, in humans high oral dosing fails to achieve detectable plasma levels. The reported failure to achieve these modest target levels in humans with oral supplements predicts limited success in translating to the clinic. In our studies, increasing curcumin solubility with phosphatidyl choline, olive oil, or stearic acid increases plasma and brain levels compared with administering unformulated curcumin powder. For example, oral gavage of an optimized lipidated curcumin formulation (Verdure Sciences, Noblesville, Indiana) resulted in 11-fold higher levels of curcumin in plasma and 4- fold higher levels in brain compared to equal doses of curcumin powder or curcumin-piperine extracts. A 5 mg curcumin dose delivered by acute gavage in this lipid rich formulation (n=5) resulted in 2.15 ± 0.744 µM mouse brain curcumin levels after 3 hrs. After 2 weeks lipidated formulation at 500 ppm curcumin in chow (n=5) we observed 5.79 ± 1.22 µM mouse brain curcumin, well above the 1-2 µM range of EC50’s for the inhibition of iNOS, IL-1ß, PGE2 and isoprostanes. This suggests oral delivery can achieve our target tissue levels.”
Source: JPET 326:196-208, 2008. Curcumin Structure-Function, Bioavailability, and Efficacy in Models of Neuroinflammation and Alzheimer's Disease. Aynun N. Begum, Mychica R. Jones, Giselle P. Lim, Takashi Morihara, Peter Kim, Dennis D. Heath, Cheryl L. Rock, Mila A. Pruitt, Fusheng Yang, Beverly Hudspeth, Shuxin Hu, Kym F. Faull, Bruce Teter, Greg M. Cole, and Sally A. Frautschy. Departments of Medicine (A.N.B., M.R.J., G.P.L., P.K., F.Y., B.H., S.H., B.T., G.M.C., S.A.F.) and Neurology (G.M.C., S.A.F.) and Psychiatry and Biobehavioral Sciences and The Semel Institute (K.F.F.), University of California, Los Angeles, California; Greater Los Angeles Healthcare System, Geriatric Research Education Clinical Center, Sepulveda, California (A.N.B., M.R.J., G.P.L., P.K., F.Y., B.H., S.H., B.T., G.M.C., S.A.F.); Cancer Prevention and Control Program, Moores UCSD Cancer Center, University of California San Diego, La Jolla, California (D.D.H., C.L.R., M.A.P.); and Department of Post-Genomics and Diseases, Division of Psychiatry and Behavioral Proteomics, Osaka University Graduate School of Medicine D3, Osaka, Japan (T.M.)
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ironjustice@aol.com - 13 Sep 2008 16:49 GMT Something we eat ? <<
I wonder what would happen if you added a little .. oil ..
"Luteolin exposure resulted in 90 percent drop in IL-6 production"
(NaturalNews) Researchers at the University of Illinois report that a plant compound found in abundance in celery and green peppers can disrupt a key component of the inflammatory response in the brain. The findings have implications for research on aging and diseases such as Alzheimer's and multiple sclerosis.
Inflammation can be a blessing or a blight. It is a critical part of the body's immune response that in normal circumstances reduces injury and promotes healing. When it goes awry, however, the inflammatory response can lead to serious physical and mental problems.
Inflammation plays a key role in many neurodegenerative diseases and also is implicated in the cognitive and behavioral impairments seen in aging.
The new study looked at luteolin (LOO-tee-OH-lin), a plant flavonoid known to impede the inflammatory response in several types of cells outside the central nervous system. The purpose of the study was to determine if luteolin could also reduce inflammation in the brain, said animal sciences professor and principal investigator Rodney Johnson.
"One of the questions we were interested in is whether something like luteolin, or other bioactive food components, can be used to mitigate age-associated inflammation and therefore improve cognitive function and avoid some of the cognitive deficits that occur in aging," Johnson said.
The researchers first studied the effect of luteolin on microglia. These brain cells are a key component of the immune defense. When infection occurs anywhere in the body, microglia respond by producing inflammatory cytokines, chemical messengers that act in the brain to orchestrate a whole-body response that helps fight the invading microorganism.
This response is associated with many of the most obvious symptoms of illness: sleepiness, loss of appetite, fever and lethargy, and sometimes a temporary diminishment of learning and memory. Neuro- inflammation can also lead some neurons to self-destruct, with potentially disastrous consequences if it goes too far.
Graduate research assistant Saebyeol Jang studied the inflammatory response in microglial cells. She spurred inflammation by exposing the cells to lipopolysaccharide (LPS), a component of the cell wall of many common bacteria.
Those cells that were also exposed to luteolin showed a significantly diminished inflammatory response. Jang showed that luteolin was shutting down production of a key cytokine in the inflammatory pathway, interleukin-6 (IL-6). The effects of luteolin exposure were dramatic, resulting in as much as a 90 percent drop in IL-6 production in the LPS-treated cells.
"This was just about as potent an inhibition as anything we had seen previously," Johnson said.
But how was luteolin inhibiting production of IL-6?
Jang began by looking at a class of proteins involved in intracellular signaling, called transcription factors, which bind to specific "promoter" regions on DNA and increase their transcription into RNA and translation into proteins.
Using electro-mobility shift assays, which measure the binding of transcription factors to DNA promoters, Jang eventually determined that luteolin inhibited IL-6 production by preventing activator protein-1 (AP-1) from binding the IL-6 promoter.
AP-1 is in turn activated by JNK, an upstream protein kinase. Jang found that luteolin inhibited JNK phosphorylation in microglial cell cultures. The failure of the JNK to activate the AP-1 transcription factor prevented it from binding to the promoter region on the IL-6 gene and transcription came to a halt.
To see if luteolin might have a similar effect in vivo, the researchers gave mice luteolin-laced drinking water for 21 days before injecting the mice with LPS.
Those mice that were fed luteolin had significantly lower levels of IL-6 in their blood plasma four hours after injection with the LPS. Luteolin also decreased LPS-induced transcription of IL-6 in the hippocampus, a brain region that is critical to spatial learning and memory.
The findings indicate a possible role for luteolin or other bioactive compounds in treating neuro-inflammation, Johnson said.
"It might be possible to use flavonoids to inhibit JNK and mitigate inflammatory reactions in the brain," he said. "Inflammatory cytokines such as interleukin-6 are very well known to inhibit certain types of learning and memory that are under the control of the hippocampus, and the hippocampus is also very vulnerable to the insults of aging," he said. "If you had the potential to decrease the production of inflammatory cytokines in the brain you could potentially limit the cognitive deficits that result."
The study appeared recently in Proceedings of the National Academy of Sciences.
Herbalists have known about the cooling properties of celery for decades and prescribe it for arthritis, hot flashes, and for cooling down the body on hot summer days.
News Source:
University of Illinois at Urbana-Champaign (2008, May 23). Plant Flavonoid In Celery And Green Peppers Found To Reduce Inflammatory Response in the Brain (http://www.uiuc.edu/)
About the author Leslee Dru Browning is a 6th generation Medical Herbalist & Nutritionist from the ancestral line of Patty Bartlett Sessions; Pioneer Mid-Wife & Herbalist. Leslee practiced Medical Herbalism and Nutritional Healing for over 25 years and specialized in Cancer Wellness along with Chronic Illness. She now devotes her career to teaching people, through her writing, about Natural Healing from An Herbal Perspective.
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Source: Johns Hopkins Medical Institutions Released: Fri 23-Sep-2005, 08:45 ET Key Protein Linked to Transverse Myelitis and Multiple Sclerosis Libraries Medical News Keywords JOHNS HOPKINS IL-6 TRANSVERSE MYELITIS MULTIPLE SCLEROSIS
Hopkins researchers have discovered a single molecule that is a cause of an autoimmune disease in the central nervous system, called transverse myelitis (TM), that is related to multiple sclerosis.
Newswise - Hopkins researchers have discovered a single molecule that is a cause of an autoimmune disease in the central nervous system, called transverse myelitis (TM), that is related to multiple sclerosis.
In a study published in the October issue of The Journal of Clinical Investigation, psychiatrist Adam Kaplin, M.D., Ph.D., an assistant professor at The Johns Hopkins University School of Medicine, and neurologist Douglas Kerr, M.D., Ph.D., also an assistant professor at Hopkins, showed that the levels of the protein, IL-6, are dramatically elevated in the spinal fluid of transverse myelitis (TM) patients.
Although the majority of TM patients suffer a single attack, 15 percent to 30 percent of patients go on to develop full-blown MS. TM evolves rapidly and without warning and usually results in permanent impairment, including weakness of the legs and arms, bowel and bladder dysfunction, pain and paralysis.
IL-6 is a chemical messenger that cells of the immune system use to communicate with one another. One of the cell types injured by high levels of IL-6 includes oligodendrocytes, which help produce the protective myelin sheath coating around nerve cells. The findings offer one possible mechanism responsible for demyelinating disorders, such as TM and MS, and may aid in the development of effective therapies against these disorders, the researchers say.
"This is the first time a single culprit has been identified as causing a CNS autoimmune disease," said Kaplin.
The researchers began investigating the protein IL-6 when they became aware that TM patients suffered from memory impairment and depression. IL-6 has been implicated in mood and concentration disorders.
"This discovery is a success story that begins with listening carefully to what patients are telling us about their suffering and then collaborating across disciplines to open up new avenues of investigation," said Kaplin.
"TM is related to other autoimmune disorders of the nervous system, including Guillain-Barré syndrome, MS and acute disseminated encephalomyelitis. This study may give us a foothold in understanding all of these disorders and how they are linked together. The benefit is, therefore, not only to those who are paralyzed by TM, but to those who have disabilities due to a variety of autoimmune disorders. We are actively using these findings to aid in developing future diagnostic, prognostic and therapeutic advancements," said Kerr, director of the Johns Hopkins Transverse Myelitis Center, the only center devoted to TM in the world.
Researchers analyzed 42 inflammatory proteins in the cerebrospinal fluid of both TM and healthy patients. They found that IL-6 was consistently elevated in TM patients' spinal fluid. Further, the level of IL-6 directly correlated with the severity of paralysis.
Using cell culture and animal studies, the researchers confirmed that elevated IL-6 levels were directly injurious to the spinal cord. They showed that spinal fluid from TM patients induced death of spinal cord cells when cultured in a dish and that IL-6, when infused in adult rats, induced paralysis. Under the microscope, tissue from IL-6- infused rats showed demyelination and injury of axons, pathology that was nearly identical to that seen in human patients with TM.
Kerr and Kaplin also deduced that the reason IL-6 elevations injure only the spinal cord and not other regions of the nervous system was because distinct regions of the nervous system have different responses to IL-6. They concluded that these different types of responses might be a part of why different autoimmune disorders of the nervous system affect distinct regions and cause distinct symptoms.
"When we started, we knew nothing about the bad players in this drama in the spinal cord of CNS autoimmune diseases - it was a classic murder mystery and we set out together to find out 'who done it'," said Kaplin. "We've answered who could have done it, and how, and where."
Funding for this study was provided by the National Institutes of Health. Other investigators involved in this study, conducted solely at Hopkins, were Deepa M. Deshpande, M.S.; Erick Scott, B.S.; Chitra Krishnan, M.S.; Jessica S. Carmen, B.S.; Irina Shats, M.S.; Tara Martinez, B.S.; Jennifer Drummond, B.S.; Sonny Dike, M.D.; Mickail Pletnikov, M.D., Ph.D.; Sanjay C. Keswani, M.B.; Timothy H. Moran, Ph.D.; Carlos A. Pardo, M.D., and Peter A. Calabresi, M.D.
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© 2005 Newswise. All Rights Reserved.
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ironjustice@aol.com - 14 Sep 2008 06:05 GMT On Sep 13, 8:49 am, "ironjust...@aol.com" <ironjust...@aol.com> wrote:The effects of luteolin exposure were dramatic, resulting in as much as a 90 percent drop in IL-6 production <<
This study shows a CLEAR effect of vegetable lecithin in these rodents. With a **cumulative** dose of oil resulting in what seems to be enhanced ability to suppress this Il-6 / "pretreatment exerts cumulative effects".
In the human an 'oil change' in the body seems to take about three months.
Intensive Care Med. 2004 Mar 26 Effects of polyenylphosphatidylcholine on cytokines, nitrite/nitrate levels, antioxidant activity and lipid peroxidation in rats with sepsis.
Demirbilek S, Ersoy MO, Demirbilek S, Karaman A, Akin M, Bayraktar M, Bayraktar N.
Department of Anesthesiology and Reanimation, Medical School of Inonu University, 44315, Malatya, Turkey.
OBJECTIVES. To determine the effect of pretreatment with polyenylphosphatidylcholine (lecithin, PPC) on plasma levels of tumor necrosis factor (TNF)-alpha, interleukin (IL)-6, IL-10, total nitrite/ nitrate (NOx), and tissue levels of superoxide dismutase (SOD) and malondialdehyde (MDA) in septic rats. DESIGN. Prospective, randomized, controlled animal study. SETTING. University laboratory. SUBJECTS. Forty-five Spraque-Dawley rats were divided into three groups: group C, sham-operated; group S, sepsis; and group P, sepsis pretreated with PPC. INTERVENTIONS. Rats were made septic by cecal ligation and puncture (CLP). Group P rats were treated with PPC (100 mg/day orally) for 10 days before sepsis. Twenty-four hours later CLP, plasma concentrations of TNF- alpha, IL-6 and IL-10 and plasma levels of NOx were measured. SOD and MDA were determined in liver, lung and heart homogenates. MEASUREMENTS AND MAIN RESULTS. All rats in group P survived during the 24-h observation time after CLP, whereas survival rate in group S was 66.7% (10/15; P<0.05). PPC significantly reduced plasma levels of TNF-alpha ( P=0.006), IL-6 ( P=0.007), IL-10 ( P=0.016), NOx ( P<0.001), and tissue levels of MDA ( P<0.001) in group P with respect to in group S. Tissue levels of SOD significantly increased in group P when compared with group S ( P<0.001). CONCLUSIONS. These results show that PPC pretreatment exerts cumulative effects in decreasing the levels of cytokines, NOx, and tissue MDA concentrations, with a concomitant increase in survival in septic rats. Lecithin therapy may be a useful adjuvant therapy in controlling of the excessive production of the inflammatory cytokines in patients with severe sepsis. DESCRIPTOR. SIRS/sepsis, experimental studies
PMID: 15045164
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ironjustice@aol.com - 14 Sep 2008 18:14 GMT if they will just follow up and tell us how to correct it....Something we take like a vitamin? Something we eat?- <<
Something ALREADY eaten.
Age-related iron accumulation occurs when we eat meat.
"Lacto-ovo vegetarians had body Fe stores of 35 and 72 for meat-eaters "
Iron builds increasingly overwhelming finally the bodies ability to keep i 'in check' . Iron spills / body cannot bind up / store the iron causing oxidation and it destroys the antioxidants in the body.
Free radical / oxidation / rust theory of ageing.
This study was recently published.
They have found by keeping the iron levels at those levels found in a vegetarian leads to a 300% decrease in cancer recurrance.
This is the study below.
It gives credence to my contention the accumulated iron levels prove man to be a herbivore.
One cannot argue a food which kills an animal / us is a 'natural' food for that animal / you.
Iron stores tested in vegetarians versus meateaters found twice as much iron in a meat eater on average than a vegetarian. "35 versus 72" -----------------
"Overall, 75% of new cancers occurred in patients with mean ferritin levels > 57 ng/mL."
"These results almost seem to be too good to be true."
Reducing Iron Stores by Phlebotomy Lowers Cancer Risk in Older Men
Jul 08 - Cancer incidence and mortality in older men may be reduced by repeated phlebotomy to lower serum ferritin levels, according to findings published online on July 8 in the Journal of the National Cancer Institute.
Observational studies suggest that lower body iron stores may protect against malignancy by reducing iron-induced oxidative stress, Dr. Leo R. Zacharski and his associates note.
To test this possibility, Dr. Zacharski, at the White River Junction Veterans Affairs Medical Center, Vermont, and his group conducted an ad hoc analysis of data from a VA study in which patients with peripheral arterial disease were assigned to repeated blood collections (n = 636) or to a control group (n = 641), originally for prevention of atherosclerotic complications .
The population was 99% male, mean age 67 years, with mean ferritin levels at baseline of 122 ng/mL. Phlebotomy was scheduled every 6months to maintain ferritin levels between 25 and 60 ng/mL. During a mean follow-up of 4.5 years, there were 60 new visceral malignancies in the control patients and 38 in the iron-reduction patients (p = 0.023).
The risk of new malignancy (hazard ratio 0.65, p = 0.036) was significantly lower in the phlebotomy group. Among patients who did develop cancer, cancer-specific mortality (HR 0.39, p = 0.003) and all- cause mortality (HR 0.49, p = 0.009) were lower in the phlebotomy group.
Overall, 75% of new cancers occurred in patients with mean ferritin levels > 57 ng/mL.
These findings do not pertain to younger patients without vascular disease, women, or African Americans, whose ferritin levels are higher than those of Caucasians, the investigators say. Instead, "these observations provide incentive for future studies and insight into optimal clinical trial design."
Dr. Zacharski's team suggests "there may be a need to redefine the normal range for the serum ferritin level based on associated disease risk." They also call for re-evaluation of the policy of routinely administering iron to anemic cancer patients.
In a related editorial, Dr. Mads Melbye, at Statens Serum Institut in Copenhagen and colleagues suggest that "these results almost seem to be too good to be true."
While recommending that "all possibilities for bias must be carefully examined" and that "the results have to be interpreted with caution," the editorialists also support more research on this topic.
Furthermore, they write, "a cautious standpoint toward iron supplementation where no proper indication exists is perhaps advisable."
J Natl Cancer Inst 2008;100.
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Decreased Cancer Risk After Iron Reduction in Patients With Peripheral Arterial Disease: Results From a Randomized Trial. Zacharski LR, Chow BK, Howes PS, Shamayeva G, Baron JA, Dalman RL, Malenka DJ, Ozaki CK, Lavori PW
J Natl Cancer Inst 2008 Jul 8.
Background Excess iron has been implicated in cancer risk through increased iron- catalyzed free radical-mediated oxidative stress. Methods A multicenter randomized, controlled, single-blinded clinical trial (VA Cooperative Study #410) tested the hypothesis that reducing iron stores by phlebotomy would influence vascular outcomes in patients with peripheral arterial disease. Patients without a visceral malignancy in the last 5 years (n = 1277) were randomly assigned to control (n = 641) or iron reduction (n = 636). Occurrence of new visceral malignancy and cause-specific mortality data were collected prospectively. Cancer and mortality outcomes in the two arms were compared using intent-to-treat analysis with a Cox proportional hazards regression model. Statistical tests were two-sided. Results Patients were followed up for an average of 4.5 years. Ferritin levels were similar in both groups at baseline but were lower in iron reduction patients than control patients across all 6- month visits (mean = 79.7 ng/mL, 95% confidence interval [CI] = 73.8 to 85.5 ng/mL vs 122.5 ng/mL, 95% CI = 115.5 to 129.5 ng/mL; P < . 001). Risk of new visceral malignancy was lower in the iron reduction group than in the control group (38 vs 60, hazard ratio [HR] = 0.65, 95% CI = 0.43 to 0.97; P = .036), and, among patients with new cancers, those in the iron reduction group had lower cancer-specific and all-cause mortality (HR = 0.39, 95% CI = 0.21 to 0.72; P = .003; and HR = 0.49, 95% CI = 0.29 to 0.83; P = .009, respectively) than those in the control group. Mean ferritin levels across all 6-monthly visits were similar in patients in the iron reduction and control groups who developed cancer but were lower among all patients who did not develop cancer than among those who did (76.4 ng/mL, 95% CI = 71.4 to 81.4 ng/mL, vs 127.1 ng/mL, 95% CI = 71.2 to 183.0 ng/mL; P = .017). Conclusions Iron reduction was associated with lower cancer risk and mortality. Further studies are needed to define the role of body iron in cancer risk. Journal of the National Cancer Institute [J Natl Cancer Inst]
-------------------------------------------------------------------------------- Br J Nutr 2001 Oct;86(4):515-9
Low iron status and enhanced insulin sensitivity in lacto-ovo vegetarians.
Hua NW, Stoohs RA, Facchini FS
Department of Medicine, Division of Nephrology, San Francisco General Hospital, San Francisco, CA, USA.
[Medline record in process]
The efficacy of insulin in stimulating whole-body glucose disposal (insulin sensitivity) was quantified using direct methodology in thirty lacto-ovo vegetarians and in thirty meat-eaters. All subjects were adult, lean (BMI <23 kg/m2), healthy and glucose tolerant. Lacto-ovo vegetarians were more insulin sensitive than meat- eaters, with a steady-state plasma glucose (mmol/l) of 4.1 (95 % CI 3.5, 5.0) v. 6.9 (95 % CI 5.2, 7.5; respectively. In addition, lacto-ovo vegetarians had lower body Fe stores, as indicated by a serum ferritin concentration (mg/l) of 35 (95 % CI 21, 49) compared with 72 (95 % CI 45, 100) for meat-eaters To test whether or not Fe status might modulate insulin sensitivity, body Fe was lowered by phlebotomy in six male meat-eaters to levels similar to that seen in vegetarians, with a resultant approximately 40 % enhancement of insulin-mediated glucose disposal Our results demonstrate that lacto-ovo vegetarians are more insulin sensitive and have lower Fe stores than meat-eaters. In addition, it seems that reduced insulin sensitivity in meat-eaters is amenable to improvement by reducing body Fe. The latter finding is in agreement with results from animal studies where, no matter how induced, Fe depletion consistently enhanced glucose disposal.
PMID: 11591239, UI: 21475355
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http://tinyurl.com/5cjd97
This study shows the effects of the different types of eating on the body.
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