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Interaction of aminoglycosides and cephaloridine in the rabbit kidney
Abstract:
Toxic doses of aminoglycosides augment organic anion transport in the rat kidney. Studies in rabbits and guinea pigs have shown that the nephrotoxicity of cephalosporins is closely related to their active transport by the organic anion carrier in the proximal renal tubule. We have examined the effects of the aminoglycosides neomycin and gentamicin on cephaloridine transport and cytotoxicity in the rabbit kidney. There was no effect of these aminoglycosides on renal cortical cephaloridine uptake. In several regimens of combined administration, there was also no additive nephrotoxicity of the aminoglycosides and cephaloridine, even though some degree of tubular necrosis was seen in the single drug control groups in each protocol. These results are in agreement with those of studies in the rat and provide evidence that the cellular mechanisms of nephrotoxicity of the cephalosporins and aminoglycosides are not closely related.
Insights
Aminoglycosides like neomycin and gentamicin do not affect cephaloridine uptake or cause additive kidney toxicity in rabbits. This suggests different cellular mechanisms for aminoglycoside and cephalosporin nephrotoxicity.
Area of Science:
- Nephrology
- Pharmacology
- Toxicology
Background:
- Nephrotoxicity of cephalosporins is linked to organic anion transport in renal proximal tubules.
- Aminoglycosides are known to cause kidney damage, potentially through different mechanisms.
Purpose of the Study:
- To investigate the interaction between aminoglycosides (neomycin, gentamicin) and cephaloridine in the rabbit kidney.
- To determine if aminoglycosides influence cephaloridine transport or exacerbate its nephrotoxicity.
Main Methods:
- Rabbits were administered single or combined doses of neomycin, gentamicin, and cephaloridine.
- Renal cortical uptake of cephaloridine was measured.
- Histopathological examination assessed tubular necrosis.
Main Results:
- Aminoglycosides did not alter renal cortical cephaloridine uptake.
- Combined administration of aminoglycosides and cephaloridine did not result in additive nephrotoxicity.
- Single drug controls showed some degree of tubular necrosis.
Conclusions:
- The cellular mechanisms underlying cephalosporin and aminoglycoside nephrotoxicity are likely distinct.
- Aminoglycosides do not appear to enhance cephalosporin-induced kidney injury via shared transport pathways.