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Related Experiment Videos

Homocysteine and B vitamins.

S Cook1, O M Hess

  • 1Swiss Cardiovascular Center, University Hospital, Bern, Switzerland.

Handbook of Experimental Pharmacology
|April 7, 2006
PubMed
Summary

High homocysteine (tHcy) levels increase cardiovascular and neurodegenerative disease risk. B-vitamin supplementation effectively lowers tHcy, reducing these risks and preventing birth defects.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Cardiovascular Medicine
  • Nutritional Science
  • Genetics

Background:

  • Homocysteine (tHcy) is a sulfur-containing amino acid crucial for methionine metabolism.
  • Elevated serum tHcy (hyperhomocysteinemia) is linked to increased cardiovascular risk, atherothrombosis, and endothelial dysfunction.
  • Genetic factors (e.g., MTHFR gene polymorphisms) and B-vitamin deficiencies contribute to hyperhomocysteinemia, particularly in Western populations.

Purpose of the Study:

  • To explore the association between homocysteine levels and cardiovascular and neurodegenerative diseases.
  • To evaluate the therapeutic potential of interventions aimed at lowering homocysteine.
  • To assess the efficacy and safety of B-vitamin supplementation for managing hyperhomocysteinemia and related conditions.

Main Methods:

  • Review of existing literature associating homocysteine levels with various health conditions.
  • Analysis of studies investigating the impact of B-vitamin supplementation (folic acid, B6, B12) on homocysteine levels.
  • Examination of data on the effects of homocysteine reduction on cardiovascular morbidity, mortality, birth defects, and anemia.

Main Results:

  • Hyperhomocysteinemia is associated with increased cardiovascular risk, atherothrombosis, and endothelial dysfunction via oxidative stress.
  • B-vitamin supplementation (folic acid, B6, B12) significantly reduces tHcy levels by 30%-50%.
  • Folic acid supplementation is effective in preventing neurotubular birth defects (spina bifida) and megaloblastic anemia.

Conclusions:

  • Therapeutic interventions to lower homocysteine, particularly B-vitamin supplementation, offer a promising strategy for preventing and treating atherosclerosis.
  • B-vitamin therapy is safe and effective in reducing cardiovascular morbidity and mortality.
  • Folic acid fortification is a public health measure that can prevent severe birth defects and hematological disorders.

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