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© 1985 Oxford University Press

research-article

Acute Nephrotoxicity of Isomeric N-(Dichlorophenyl)succinimides in Sprague-Dawley and Fischer 344 Rats1,2

DAVID J. YANG*, E. PATRICIA LAHODA*, PATRICK I. BROWNE{dagger} and GARY O. RANKIN*,3

*Departments of Pharmacology, Marshall University School of Medicine Huntington, West Virginia 25704-2901 {dagger}Departments of Anatomy, Marshall University School of Medicine, Huntington West Virginia 25704-2901

Previous studies have shown that reducing the chlorine content of the experimental agricultural fungicide N-(3,5-dichlorophenyl)succinimide (3,5-NDPS) produces compounds with reduced nephrotoxic potential. The purpose of this study was to determine the importance of the ring position of the two chlorine atoms for the nephrotoxic potential of 3,5-NDPS in rats. Male Sprague-Dawley or Fischer 344 rats were administered a single intra-peritoneal injection of a N-(dichlorophenyl)succinimide (0.4 or 1.0 mmol/kg) or vehicle (2.5 ml/kg), and renal function was monitored at 24 and 48 hr. The most nephrotoxic NDPS isomer in both rat strains was 3,5-NDPS. In Sprague-Dawley rats 2,4-, 2,5- and 3,4-NDPS were weakly nephrotoxic. In Fischer 344 rats, 2,4-NDPS (1.0 mmol/kg) and 3,5-NDPS (0.4 mmol/kg) produced similar nephrotoxicity. Weak renal effects were produced by 3,4-NDPS in Fischer 344 rats. The order of increasing nephrotoxicity did not correlate well with the increasing partition coefficients or fungicidal activities of the compounds. These results indicate that 3,5-NDPS is the most nephrotoxic NDPS isomer in rats, and that partition coefficients alone are not good predictors of nephrotoxic potential in this series. In addition, these results do not support a correlation between the fungicidal and nephrotoxic mechanisms of action of these compounds.


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