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[Effect of polyene antibiotics on the isolated kidney mitochondria of dogs]
Abstract:
The effect of amphotericin B and nystatin on mitochondria isolated from the dog kidneys was studied. It was shown that incubation of the isolated kidney mitocondria with amphotericin B or nystatin at a wide range of their concentrations, i.e. from 0.1 to 100 gamma per 0.5 mg of the mitochondrial protein did not affect the activity of succinate dehydrogenase of these cell microstructures. The absence of changes in the succinate dehydrogenase activity of the mitochondria under the effect of the polyenic antibiotics is significant from the viewpoint of elucidating their molecular mechanisms of the nephrotoxic effect.
Insights
Amphotericin B and nystatin do not impact kidney mitochondria enzyme activity. This finding offers insights into the molecular basis of these polyenic antibiotics' nephrotoxic effects.
Area of Science:
- Biochemistry
- Pharmacology
- Nephrology
Context:
- Mitochondria are vital organelles susceptible to drug-induced damage.
- Polyenic antibiotics like amphotericin B and nystatin are used to treat fungal infections but can cause kidney toxicity.
- Understanding the molecular mechanisms of drug-induced organ damage is crucial for developing safer therapeutics.
Purpose:
- To investigate the direct effect of amphotericin B and nystatin on mitochondrial function in dog kidneys.
- To determine if these antibiotics alter the activity of succinate dehydrogenase, a key enzyme in mitochondrial respiration.
- To explore the relationship between mitochondrial enzyme activity and the nephrotoxic potential of polyenic antibiotics.
Summary:
- Isolated mitochondria from dog kidneys were incubated with varying concentrations of amphotericin B and nystatin.
- Succinate dehydrogenase activity in these mitochondria remained unchanged despite exposure to the antibiotics.
- The study demonstrates that these polyenic antibiotics do not directly inhibit a critical mitochondrial enzyme.
Impact:
- Provides evidence that the nephrotoxicity of amphotericin B and nystatin may not stem from direct inhibition of succinate dehydrogenase.
- Suggests alternative molecular targets or mechanisms are responsible for the observed kidney damage.
- Contributes to a better understanding of antifungal drug toxicity and informs the development of nephroprotective strategies.