Evaluation of Phenolic Ethers as Hypolipidaemic Agents: Effects of CIBA 13,437-SU. In: Holmes WL, Carlson LA, Paoletti R, editors. Drugs Affecting Lipid Metabolism. Boston: Springer US; 1995. pp. 483-9. [DOI: 10.1007/978-1-4615-6866-7_39]

Prevention of CeCl3-induced hepatotoxicity by hypolipidemic compounds

Pretreatment of rats with nafenopin, a hypolipidemic compound, prevents the lethality and hepatotoxicity induced by cerium chloride (CeCl3), a rare earth metal. The increase in hepatic triglycerides and the morphologic changes observed after 48 h of the CeCl3 injection (10 mg/kg) are completely abolished by nafenopin given for 4 days in doses of 250 mg/kg. However, an increase in the frequency of peroxisomes is noted in rats receiving nafenopin and CeCl3, attributable to the hypolipidemic drug pretreatment. In comparing the protective effect of nafenopin with that of CPIB (a structurally related compound) and lentysine (a structurally unrelated agent), it can be seen that nafenopin is about five times more active in decreasing liver triglycerides. The hepatic ultrastructure of rats pretreated with CPIB or lentysine is similar to that of CeCl3-treated controls.

Effect of nafenopin (SU-13,437) on liver function: influence on the hepatic transport of organic anions

Rats treated with hypolipidemic agent, nafenopin (SU-13, 437) exhibit a higher plasma retention and a markedly reduced biliary excretion of organic anions, such as sulfobromophthalein (BSP) and its dibromo analog (DPSP), indocyaninegreen (ICG), succinylsulfathiazole (SST) and polar metabolites of bilirubin and the carcinogens 7, 12-dimethylbenzanthracene (DMBA) and 3,4 benzpyrene (BP), despite an increase in liver mass and a profound choleresis. However, taurocholate is not affected in this manner, which supports the idea of a transport mechanism for taurocholate that differs from that of other organic anions. A pharmacokinetic study was made for DBSP in vivo. After nafenopin treatment, primary hepatic uptake (k12) and transport from liver into bile (k23) are reduced in vivo. Infusion studies indicate that biliary transport maximum (Tm) for DBSP is also decreased although the calculated hepatic storage (S) is only moderately affected. In the isolated perfused liver, hepatic clearance and biliary excretion of BSP are reduced by two-thirds. The time course of anion transport inhibition and the hepato-biliary disposition of 14C-nafenopin suggest a direct effect of the drug. The extra liver mass induced by nafenopin appears to be hypo- or nonfunctional with respect to hepatic transport of organic anions.