Amelioration by cAMP of Cephaloridine-Induced Injury in the Porcine Kidney Cell Line LLC-PK1

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Abstract
We investigated the effects of a phosphodiesterase inhibitor and dibutyryl cAMP (dBcAMP) on the cell injury induced by cephaloridine (CER) in an established renal epithelial cell LLC-PK1. CER increased the leakage of lactate dehydrogenase (LDH) from LLC-PK1 cells to the medium and the level of lipid peroxidation in the cells. 3-Isobutyl-1-methylxanthine, a phosphodiesterase inhibitor, increased cAMP content in LLC-PK1 cells and ameliorated the increase in LDH leakage induced by CER, dBcAMP reduced the cell injury induced by CER. Our results suggest that a signalling pathway of cAMP protects against CER-induced renal cell injury, which is probably due to generation of oxygen radicals.