Publication: Differential effects of hydroxyacetophenone analogues on the transcytotic vesicular pathway in rat liver
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Issued Date
2006-10-10
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00142999
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2-s2.0-33748532502
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Mahidol University
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SCOPUS
Bibliographic Citation
European Journal of Pharmacology. Vol.547, No.1-3 (2006), 152-159
Suggested Citation
Lukmanee Tradtrantip, James L. Boyer, Apichart Suksamrarn, Pawinee Piyachaturawat Differential effects of hydroxyacetophenone analogues on the transcytotic vesicular pathway in rat liver. European Journal of Pharmacology. Vol.547, No.1-3 (2006), 152-159. doi:10.1016/j.ejphar.2006.07.018 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/23880
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Title
Differential effects of hydroxyacetophenone analogues on the transcytotic vesicular pathway in rat liver
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Abstract
Insertion of transporter proteins into the apical canalicular membrane via vesicular transport is one of several choleretic mechanisms. Based on different choleretic activities of hydroxyacetophenone analogues including 4-mono; 2,6-di and 2,4,6-trihydroxy-acetophenone (MHA, DHA and THA), the present study aims to determine if these compounds stimulated vesicular transport in hepatocytes. Hydroxyacetophenone was continuously infused into the duodenum of the bile fistula rat. Bile flow rate was allowed to stabilize and then followed by an intraportal injection of horseradish peroxidase, a marker of the transcytotic vesicle pathway. MHA which stimulates bile acid independent flow, showed a dose-dependent increase in both the early (paracellular) and late (transcellular) peak of horseradish peroxidase excretion in bile. THA, which stimulates both bile acid dependent flow and bile acid independent flow, did not alter the pattern of horseradish peroxidase excretion into bile. However, DHA, which is more hydrophobic and increases only bile acid dependent flow, decreased the late peak. The stimulating effects of MHA on bile flow and horseradish peroxidase excretion were markedly inhibited by colchicine, suggesting that its choleretic action involves stimulation of exocytosis, as well as increase in paracellular permeability. In contrast, the lack of a stimulatory effect of THA and DHA on biliary horseradish peroxidase excretion suggested that their choleretic action is not associated with vesicular exocytosis. These results demonstrate a variable effect of hydroxyacetophenones on the transcytotic vesicular pathway reflecting different choleretic mechanisms and therapeutic potential. © 2006 Elsevier B.V. All rights reserved.