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Abstract:
Gentamicin sulfate was tested for nephrotoxicity in B6D2F1 hybrid mice after s.c. and i.p. administration. By a series of experiments designed to study histological lesions (tubular epithelial desquamation, intracytoplasmatic coarse granulation of epithelial cells) the following procedure showed favourable results: withdrawal of drinking water 24 h before start of experiment--one daily s.c. administration during four days--post mortem examination after further 24 h. Within the epithelium of the proximal tubules two distinct lesions can be distinguished morphologically 1. an acute necrosis giving rise to acute cytolysis, 2. at a lower segment of the nephron, intracytoplasmatic storage of PAS-positive granules in cells, which are devoid of a brush border but have otherwise experienced only slight alterations. The morphology of these lesions is similar to that after administration of toxic doses of cephaloridine though the resorption of the compounds takes place in the case of gentamicin at the free cell border whereas after cephaloridine administration the compound enters the tubular epithelial cells via the basal membrane.
Insights
Gentamicin sulfate causes kidney damage in mice, characterized by distinct tubular lesions. The study outlines a specific experimental protocol to effectively observe these nephrotoxic effects.
Area of Science:
- Nephrology
- Toxicology
- Histopathology
Context:
- Gentamicin sulfate is a widely used antibiotic with known nephrotoxic potential.
- Understanding the precise mechanisms and histological manifestations of gentamicin-induced kidney damage is crucial for patient safety.
- Previous studies have indicated varying degrees of renal toxicity with different administration routes.
Purpose:
- To investigate the nephrotoxicity of gentamicin sulfate in B6D2F1 hybrid mice.
- To characterize the specific histological lesions induced by gentamicin sulfate in the proximal tubules.
- To establish an optimized experimental procedure for observing gentamicin-induced nephrotoxicity.
Summary:
- Gentamicin sulfate administration in mice resulted in observable histological lesions within the proximal tubules.
- Two distinct lesions were identified: acute necrosis with cytolysis and intracytoplasmic storage of PAS-positive granules in cells lacking a brush border.
- An effective experimental protocol involved water withdrawal, daily subcutaneous administration of gentamicin sulfate for four days, and post-mortem examination 24 hours later.
Impact:
- This research provides a detailed morphological description of gentamicin-induced nephrotoxicity.
- The established protocol can serve as a model for future studies investigating antibiotic nephrotoxicity.
- Findings contribute to a better understanding of drug-induced kidney injury and inform clinical practice regarding gentamicin use.