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Ethanol induced cardiovascular disease
1Department of Clinical Biochemistry, King's College School of Medicine, London, UK.
Insights
Excessive alcohol consumption causes alcoholic heart muscle disease (AHMD), a form of dilated cardiomyopathy. Abstaining from alcohol may reverse AHMD, which involves metabolic and potential autoimmune factors.
Area of Science:
- Cardiology
- Toxicology
- Biochemistry
Background:
- Mild or moderate ethanol consumption may benefit coronary artery disease.
- Excessive ethanol consumption leads to alcoholic heart muscle disease (AHMD), characterized by dilated cardiomyopathy and ventricular dysfunction.
- AHMD is defined by alcohol consumption as the sole cause of observed abnormalities.
Purpose of the Study:
- To explore the metabolic basis of alcoholic heart muscle disease.
- To investigate the role of protein metabolism defects and acetaldehyde in AHMD pathogenesis.
- To examine potential autoimmune mechanisms in AHMD.
Main Methods:
- Review of evidence on myocardial biochemistry alterations in AHMD.
- Analysis of the impact of acetaldehyde on protein synthesis and contractile proteins.
- Investigation of free radical damage and acetaldehyde adducts in AHMD.
Main Results:
- AHMD pathogenesis is likely multifactorial, involving myocardial biochemical alterations.
- Central defects in protein metabolism, potentially due to free radicals or acetaldehyde adducts, are implicated.
- Acetaldehyde significantly disrupts protein synthesis and reduces contractile protein formation, suggesting an autoimmune basis via auto-antibodies.
Conclusions:
- Alcoholic heart muscle disease is a serious condition linked to excessive alcohol intake.
- Metabolic disturbances, particularly in protein synthesis disrupted by acetaldehyde, are key to AHMD.
- Abstinence from alcohol may lead to the reversal of AHMD, and autoimmune factors may contribute to its progression.
Abstract:
Although the beneficial effects of mild or moderate ethanol consumption have been implied with respect to coronary artery disease, excessive ethanol consumption can result in alcoholic heart muscle disease (AHMD). The latter is characterized by features consistent with dilated cardiomyopathy with concomitant ventricular dysfunction and histopathological abnormalities. By definition, no other cause for the abnormalities in AHMD is demonstrated, other than excessive alcohol consumption. The metabolic basis of AHMD is probably multi-factorial, and the alterations of myocardial biochemistry are contributing factors for the precipitation and progression of the disease. The latter may reverse with abstention. Evidence is provided to support the contention that the abnormalities include central defects in protein metabolism, which perhaps are engendered by free radicals and/or the formation of acetaldehyde adducts. The latter may initiate the formation of auto-antibodies, therefore providing an auto-immune basis for AHMD in chronic alcohol misuse. Evidence is also provided to show that acetaldehyde is a potent perturbant of protein synthesis, and reduces the formation of new contractile proteins.