Abstract
The cytotoxicity profile of various chemical entities was evaluated using two in vitro hepatocyte models. Liverbeads is a cryopreserved model consisting of primary hepatocytes entrapped in alginate beads. WIF-B9 is a hybrid cell line obtained by fusion of rat hepatoma (Fao) and human fibroblasts (WI38). Various reference hepatotoxicants were tested and ranked according to their equivalent concentration 50 (EC50) for various biochemical endpoints (lactate dehydrogenase (LDH) release, 3-(4,5 dimethylthiazol 2yl)-2,5-diphenyl-2H tetrazolium bromure (MTT) activity, adenosine triphosphate (ATP) and glutathione (GSH) levels). The ranking obtained was comparable in both models and consistent with previously published results on hepatocyte monolayers. Ketoconazole, erythromycin estolate, retinoic acid, telithromycin and alpha-naphthyl-isothiocyanate were among the most toxic chemicals in both models, with an EC50 < 200 microM. Troleandomycin, spiramycin, erythromycin, diclofenac, taurodeoxycholate, warfarin, galactosamine, valproic acid and isoniazid were found to be less toxic. Few marked differences, potentially linked to metabolism pathways, were observed between EC50s in the two models for compounds such as cyclosporine A (10 and >...Continue Reading
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