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Nutrition & Metabolism
Published in: Nutrition & Metabolism 1/2017

Open Access 01-12-2017 | Review

The metabolism and significance of homocysteine in nutrition and health

Authors: Avinash Kumar, Henry A. Palfrey, Rashmi Pathak, Philip J. Kadowitz, Thomas W. Gettys, Subramanyam N. Murthy

Published in: Nutrition & Metabolism | Issue 1/2017

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Abstract

An association between arteriosclerosis and homocysteine (Hcy) was first demonstrated in 1969. Hcy is a sulfur containing amino acid derived from the essential amino acid methionine (Met). Hyperhomocysteinemia (HHcy) was subsequently shown in several age-related pathologies such as osteoporosis, Alzheimer’s disease, Parkinson’s disease, stroke, and cardiovascular disease (CVD). Also, Hcy is associated with (but not limited to) cancer, aortic aneurysm, hypothyroidism and end renal stage disease to mention some. The circulating levels of Hcy can be increased by defects in enzymes of the metabolism of Met, deficiencies of vitamins B6, B12 and folate or by feeding Met enriched diets. Additionally, some of the pharmaceuticals currently in clinical practice such as lipid lowering, and anti-Parkinsonian drugs are known to elevate Hcy levels. Studies on supplementation with folate, vitamins B6 and B12 have shown reduction in Hcy levels but concomitant reduction in certain associated pathologies have not been definitive. The enormous importance of Hcy in health and disease is illustrated by its prevalence in the medical literature (e.g. > 22,000 publications). Although there are compelling data in favor of Hcy as a modifiable risk factor, the debate regarding the significance of Hcy mediated health effects is still ongoing. Despite associations between increased levels of Hcy with several pathologies being well documented, whether it is a causative factor, or an effect remains inconclusive. The present review though not exhaustive, is focused on several important aspects of Hcy metabolism and their relevance to health.
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Metadata
Title
The metabolism and significance of homocysteine in nutrition and health
Authors
Avinash Kumar
Henry A. Palfrey
Rashmi Pathak
Philip J. Kadowitz
Thomas W. Gettys
Subramanyam N. Murthy
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Nutrition & Metabolism / Issue 1/2017
Electronic ISSN: 1743-7075
DOI
https://doi.org/10.1186/s12986-017-0233-z

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