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dc.contributor.authorLukmanee Tradtrantipen_US
dc.contributor.authorJames L. Boyeren_US
dc.contributor.authorApichart Suksamrarnen_US
dc.contributor.authorPawinee Piyachaturawaten_US
dc.contributor.otherMahidol Universityen_US
dc.contributor.otherYale University School of Medicineen_US
dc.contributor.otherRamkhamhaeng Universityen_US
dc.identifier.citationEuropean Journal of Pharmacology. Vol.547, No.1-3 (2006), 152-159en_US
dc.description.abstractInsertion 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.en_US
dc.rightsMahidol Universityen_US
dc.subjectPharmacology, Toxicology and Pharmaceuticsen_US
dc.titleDifferential effects of hydroxyacetophenone analogues on the transcytotic vesicular pathway in rat liveren_US
Appears in Collections:Scopus 2006-2010

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