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Adriamycin and altered membrane functions in rat hearts
British Journal of Experimental Pathology
|October 1, 1986
Summary
Adriamycin exposure increases myocardial calcium levels and impairs sarcolemmal and mitochondrial functions. These membrane alterations, particularly lipid peroxidation effects, contribute to adriamycin cardiotoxicity.
Area of Science:
- Biochemistry
- Cardiology
- Toxicology
Background:
- Adriamycin (doxorubicin) is a widely used chemotherapy agent.
- Cardiotoxicity is a significant dose-limiting side effect of adriamycin therapy.
- The precise mechanisms underlying adriamycin-induced cardiotoxicity are not fully understood.
Purpose of the Study:
- To investigate the role of altered membrane functions and subsequent calcium overload in adriamycin cardiotoxicity.
- To assess the impact of adriamycin on sarcolemmal, sarcoplasmic reticular, and mitochondrial functions.
Main Methods:
- Isolated hearts were perfused using the Langendorff technique.
- Hearts were exposed to adriamycin (50 micrograms/ml).
- Sarcolemmal, sarcoplasmic reticular, and mitochondrial functions, along with myocardial calcium content, were measured.
Main Results:
- Adriamycin perfusion significantly increased myocardial tissue calcium content.
- Sarcolemmal ouabain-sensitive Na+,K+-ATPase activity was markedly decreased.
- Mitochondrial calcium uptake and respiratory activity were depressed, indicating inhibition of the NADH-dehydrogenase system.
Conclusions:
- Alterations in membrane functions, including enzyme inhibition susceptible to lipid peroxidation, play a crucial role in adriamycin-induced calcium overload.
- These membrane dysfunctions contribute significantly to the pathogenesis of acute adriamycin cardiotoxicity.