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Hyperhomocysteinaemia, Helicobacter pylori, and coronary heart disease
1Department of Medicine, Chinese University of Hong Kong, Shatin.
Insights
Helicobacter pylori infection may contribute to coronary artery disease by causing vitamin and folate deficiency. This deficiency can lead to homocysteine accumulation, a toxin harmful to blood vessels.
Area of Science:
- Cardiovascular Science
- Gastroenterology
- Nutritional Science
Background:
- Hyperhomocysteinemia and Helicobacter pylori infection are emerging risk factors for coronary artery disease (CAD).
- The link between these factors and CAD pathogenesis is not fully understood.
- Chronic gastritis from H. pylori infection may affect nutrient absorption.
Purpose of the Study:
- To investigate the potential link between H. pylori infection, vitamin/folate deficiency, and hyperhomocysteinemia in CAD.
- To explore the role of impaired methylation in homocysteine accumulation.
- To understand the contribution of these factors to endothelial dysfunction and CAD.
Main Methods:
- Review of existing literature on H. pylori, homocysteine, and CAD.
- Analysis of proposed biochemical pathways involving folate metabolism and methylation.
- Examination of the toxic effects of homocysteine on endothelial cells.
Main Results:
- H. pylori infection can cause chronic gastritis, leading to deficiencies in vitamins and folate.
- Reduced folate availability impairs the methylation cycle, specifically the role of 5-methyl-tetrahydrofolic acid.
- This impairment results in elevated homocysteine levels, a known risk factor for CAD.
Conclusions:
- H. pylori infection-induced nutritional deficiencies may be a significant, previously unrecognized pathway to hyperhomocysteinemia and CAD.
- Targeting H. pylori and addressing associated vitamin deficiencies could be a novel strategy for CAD prevention.
- Homocysteine's endothelial toxicity is a key mechanism linking these factors to cardiovascular disease.
Abstract:
Hyperhomocysteinaemia and Helicobacter pylori infection have recently been implicated in the pathogenesis of coronary artery disease. These two risk factors, though they seem unrelated, could be linked by a deficiency of vitamins and folate caused by chronic gastritis in H pylori infection. This nutritional defect could lead to failure of methylation by 5-methyl-tetrahydrofolic acid and thus exacerbate the accumulation of homocysteine in susceptible patients. Homocysteine is toxic to endothelial cells and results in coronary artery disease.