Effect of chronic renal failure on the hepatic, intestinal and renal expression of bile acid transporters.

This study was designed to examine the effects of naturally progressing CRF of longer duration on the hepatic and renal mRNA and protein levels of the BA synthesizing enzyme, Cyp7a1 and the BA transporters, Ntcp, Bsep, Mrp3, Ost-α and Ost-β. Sprague Dawley rats were randomized to the CRF group (5/6 nephrectomy) or to the sham-operated control group and were analyzed 8 weeks after surgery. Results obtained in the CRF rats were compared to those obtained in rats that had undergone uninephrectomy (UNX). The CRF group exhibited significantly increased plasma cholesterol and BA concentrations. Hepatic Cyp7a1 mRNA and protein levels were almost identical in the two groups. Hepatic Mrp3, Ost-α and Ost-β expression was increased, suggesting increased basolateral efflux of bile acids into blood. However, no such changes in BA transporter expression were observed in the remnant kidney. In UNX rats similar changes in plasma BA levels and in the expression of BA transporters were found. We hypothesize that the increase in plasma bile acids is an early event in the progression of CRF and is caused by increased efflux across the basolateral hepatocyte membrane. PMID: 24197062 [PubMed - as supplied by publisher]
Source: Am J Physiol Renal P... - Category: Urology & Nephrology Authors: Tags: Am J Physiol Renal Physiol Source Type: research