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Myocardial adaptive changes and damage in ischemic heart disease
1Department of Internal Medicine, Aoto Hospital, Jikei University School of Medicine, Tokyo, Japan.
Annals of the New York Academy of Sciences
|September 30, 1996
Summary
Ischemic heart disease alters cardiac energetics by changing ventricular myosin isozymes and causing mitochondrial DNA deletions. These molecular changes in the heart may be adaptive responses to energy metabolism dysfunction.
Area of Science:
- Cardiovascular Biology
- Molecular Cardiology
- Mitochondrial Genetics
Background:
- Cardiac energetics are crucial for heart function.
- Myocardial subcellular organelles play key roles in energy metabolism.
- Ischemic heart disease (IHD) affects cardiac energy production.
Purpose of the Study:
- To investigate changes in ventricular myosin isozymes and mitochondrial DNA mutations in patients with IHD.
- To explore the relationship between these molecular alterations and cardiac energetics in IHD.
Main Methods:
- Analysis of left ventricular tissue samples from autopsy.
- Separation and quantification of myosin isozymes using pyrophosphate and SDS polyacrylamide gel electrophoresis.
- Detection of mitochondrial DNA mutations, specifically a 7.4-kb deletion, using polymerase chain reaction.
Main Results:
- Ventricular myosin isozyme VM-A concentrations were higher in IHD patients compared to controls.
- A 7.4-kb deletion in mitochondrial DNA was detected in 60% of patients with myocardial infarction.
- Changes in myosin isozyme ratios were observed, though their functional significance remains unclear.
Conclusions:
- Ischemic heart disease is associated with alterations in ventricular myosin isozymes and mitochondrial DNA.
- These molecular changes may represent adaptive responses to impaired cardiac energy metabolism.
- Mitochondrial DNA deletions are likely a consequence of ischemic damage in myocardial infarction.