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Toxic effects on rabbit kidney cell cultures of a new aminoglycoside
I Viano1, A A Bertelli, C Dianzani
1Institute of Pharmacology and Experimental Therapy, University of Turin, Italy.
Abstract:
In this study the cellular toxicity of two aminoglycosides (gentamicin and dactimicin) have been evaluated using rabbit kidney cell cultures. The correlation between toxic effect and antibiotic concentration, and between toxic effect and the period of contact have been evaluated. The toxic effect was measured in rabbit kidney cell cultures by means of the release of N-acetyl-beta-glucosaminidase. This enzyme was chosen in order to establish a correlation between in vitro and in vivo results. Gentamicin clearly shows in both tests a non-linear correlation between cellular toxicity and concentration or period of contact. Dactimicin, a new aminoglycoside probably less toxic than others, also shows in both tests a non-linear correlation between cellular toxicity and concentration or period of contact, but the release of enzyme was significantly reduced during the treatment of the cell cultures with this aminoglycoside.
Insights
This study evaluated cellular toxicity of gentamicin and dactimicin using rabbit kidney cells. Dactimicin showed significantly reduced enzyme release, indicating potentially lower toxicity compared to gentamicin.
Area of Science:
- Nephrology
- Pharmacology
- Toxicology
Background:
- Aminoglycosides are crucial antibiotics but can cause kidney damage.
- Evaluating the cellular toxicity of gentamicin and dactimicin is essential for understanding their nephrotoxic potential.
Purpose of the Study:
- To assess the cellular toxicity of gentamicin and dactimicin in rabbit kidney cell cultures.
- To correlate antibiotic concentration and contact period with toxic effects.
- To compare the nephrotoxicity profiles of gentamicin and dactimicin.
Main Methods:
- Utilized rabbit kidney cell cultures to evaluate cellular toxicity.
- Measured the release of N-acetyl-beta-glucosaminidase as an indicator of cell damage.
- Assessed the relationship between antibiotic concentration, contact time, and enzyme release.
Main Results:
- Both gentamicin and dactimicin exhibited a non-linear correlation between cellular toxicity and concentration or contact period.
- Dactimicin demonstrated significantly reduced N-acetyl-beta-glucosaminidase release compared to gentamicin.
- The chosen enzyme assay allowed for correlation between in vitro findings and potential in vivo outcomes.
Conclusions:
- Dactimicin appears to be less nephrotoxic than gentamicin based on in vitro cellular toxicity assays.
- The non-linear dose- and time-dependent toxicity observed highlights the complexity of aminoglycoside nephrotoxicity.
- N-acetyl-beta-glucosaminidase release serves as a valuable biomarker for predicting aminoglycoside-induced kidney injury.