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The effect of gentamicin on calcium uptake by renal mitochondria
Abstract:
The effect of the nephrotoxic aminoglycoside antibiotic, gentamicin, on calcium uptake by renal cortical mitochondria was assessed in vitro. Gentamicin was found to be a competitive inhibitor of mitochondrial Ca++ uptake. This effect displayed a dose response with a Ki of 233 microM and occurred at gentamicin concentrations below those that inhibit mitochondrial electron transport. These results further demonstrate the potential for gentamicin to alter membrane function and thereby contribute to toxic cell injury via its interactions with divalent cations.
Insights
Gentamicin, an antibiotic, inhibits calcium uptake in kidney mitochondria. This competitive inhibition occurs at low concentrations, suggesting a role in gentamicin
Area of Science:
- Nephrology
- Biochemistry
- Pharmacology
Background:
- Aminoglycoside antibiotics like gentamicin are known for nephrotoxicity.
- Mitochondrial dysfunction is a key mechanism in drug-induced kidney injury.
Purpose of the Study:
- To investigate the in vitro effect of gentamicin on calcium uptake by renal cortical mitochondria.
- To elucidate the mechanism by which gentamicin may contribute to nephrotoxicity.
Main Methods:
- In vitro assessment of calcium uptake in isolated renal cortical mitochondria.
- Dose-response analysis to determine inhibition kinetics.
Main Results:
- Gentamicin acts as a competitive inhibitor of mitochondrial calcium (Ca++) uptake.
- The inhibition demonstrates a dose-response relationship with a Ki of 233 microM.
- This inhibitory effect occurs at gentamicin concentrations lower than those affecting mitochondrial electron transport.
Conclusions:
- Gentamicin interferes with mitochondrial calcium homeostasis.
- This interaction with divalent cations like calcium may alter mitochondrial membrane function.
- Gentamicin's inhibition of calcium uptake is a potential mechanism contributing to its nephrotoxic effects.