Susceptibility of HEK293 and RPTEC Cell Lines to Nephrotoxic Effects of Cefuroxime and Cefepime: A Comparative Study

Abstract

Researchers need to identify the nephrotoxic properties of medicinal products both during preclinical development and when exploring options to optimise pharmacotherapy. The main challenge is to find an experimental model for assessing drug-induced nephrotoxicity that reflects in vivo conditions as closely as possible.The aim of the study was to compare the susceptibility of HEK293 and RPTEC cell lines used as experimental models for assessing the nephrotoxicity of cefuroxime and cefepime.Materials and methods. The study investigated HEK293 and RPTEC cell lines cultured on plates with 0.4 µm pore membrane inserts. The cell lines were incubated for 3 days with cefuroxime and cefepime (cephalosporins excreted primarily by the kidneys). The medicinal products were added to the basal part of the well at concentrations of 50 and 150 µg/mL (cefuroxime) or 30 and 120 µg/mL (cefepime) twice a day. After incubating the cells with cefuroxime and cefepime for 24, 48, and 72 hours, the authors determined the expression levels of the SLC22A6 and SLC22A8 genes encoding organic anion transporters by a reverse transcription polymerase chain reaction. The authors considered caspase 3 and caspase 7 activation indicative of the nephrotoxic effect of cephalosporins; they evaluated this indicator by a fluorometric assay after 24, 48, and 72 hours of incubation.Results. According to the study, the expression of the SLC22A6 and SLC22A8 genes decreased with cephalosporin transport in both cell lines. The decrease occurred in the RPTEC cell line earlier than in the HEK293 cell line. The authors observed caspase 3 and caspase 7 activation only in the RPTEC cell line after incubation with cefuroxime and cefepime at low concentrations (50 and 30 µg/mL, respectively) for 72 hours and at high concentrations (150 and 120 µg/mL, respectively) for 24 hours.Conclusions. The RPTEC cell line exhibits higher susceptibility to cefuroxime and cefepime toxic effects than the HEK293 cell line due to higher transporter gene expression. Higher cephalosporin concentrations accelerate caspase 3 and caspase 7 activation in the RPTEC cell line. The experimental model based on the RPTEC cell line is a promising tool for the analysis of the nephrotoxic properties of a wide range of medicinal products.