The use of renal cortical slices from the Fischer 344 rat as an in vitro model to evaluate nephrotoxicity.

The toxicity of several classical acute nephrotoxicants was evaluated in an in vitro system using renal cortical slices prepared from adult male Fischer 344 rats. Gentamicin, cephaloridine, 4-ipomeanol, potassium dichromate (K2Cr2O7), mercuric chloride (HgCl2), carbon tetrachloride (CCl4), and hexachlorobutadiene (HCBD) were preincubated with slices for 2 hr at 37 degrees C at concentrations ranging from 1 x 10(-6) to 1 x 10(-1) M. Following preincubation, slices were removed, rinsed in medium lacking the nephrotoxicant, and subsequently incubated for 90 min at 25 degrees C for physiological assessment of proximal tubular functions. Using a single preparation, slices were monitored for organic ion accumulation, gluconeogenesis, lipid peroxidation, and total glutathione (reduced and oxidized) concentrations. In addition, preincubation and incubation media were assessed for the presence of renal enzymes originating from brush border, cytosol, and lysosomes. The relative degree of toxicity in this model was consistent with nephrotoxic potency in vivo where HgCl2, K2Cr2O7 greater than HCBD greater than CCl4, cephaloridine greater than gentamicin greater than 4-ipomeanol. Effects on organic ion accumulation, gluconeogenesis, and glutathione concentrations occurred simultaneously for each toxicant. Toxicants produced different effects on enzyme release and malondialdehyde formation. These results suggest that toxicity produced in vitro is representative of in vivo nephrotoxicity and support the further use of this model to evaluate mechanisms of nephrotoxicity.