Abstract
Bile acid transport in female DA (dark Aguti) rats, a model for debrisoquine hydroxylation deficiency in man, was investigated. Compared to hydroxylation competent male DA and Sprague-Dawley rats of either sex, the female DA rat had a significantly lower taurocholate maximal secretory rate in vivo. Studies in the perfused liver showed this to be due to a decreased extraction efficiency during exogenous taurocholate loading. To characterize further the defect, taurocholate uptake velocity into isolated hepatocytes was studied. This showed a decreased maximal uptake velocity in the female DA rat ( P < 0.02). Whether this defect in bile acid uptake is related to the defective debrisoquine hydroxylation, remains to be established.
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