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Title: Activation of AMP-activated protein kinase by a plant-derived dihydroisosteviol in human intestinal epithelial cell
Authors: Chatchai Muanprasat
Lalida Sirianant
Sutthipong Sawasvirojwong
Sureeporn Homvisasevongsa
Apichart Suksamrarn
Varanuj Chatsudthipong
Mahidol University
Huachiew Chalermprakiet University
Ramkhamhaeng University
Keywords: Pharmacology, Toxicology and Pharmaceutics
Issue Date: 1-Apr-2013
Citation: Biological and Pharmaceutical Bulletin. Vol.36, No.4 (2013), 522-528
Abstract: Our previous study has shown that dihydroisosteviol (DHIS), a derivative of stevioside isolated from Stevia rebaudiana (Bertoni), inhibits cystic fibrosis transmembrane conductance regulator (CFTR)-mediated transepithelial chloride secretion across monolayers of human intestinal epithelial (T84) cells and prevents cholera toxin-induced intestinal fluid secretion in mouse closed loop models. In this study, we aimed to investigate a mechanism by which DHIS inhibits CFTR activity. Apical chloride current measurements in Fisher rat thyroid cells stably transfected with wild-type human CFTR (FRT-CFTR cells) and T84 cells were used to investigate mechanism of CFTR inhibition by DHIS. In addition, effect of DHIS on AMP-activated protein kinase (AMPK) activation was investigated using Western blot analysis. Surprisingly, it was found that DHIS failed to inhibit CFTR-mediated apical chloride current in FRT-CFTR cells. In contrast, DHIS effectively inhibited CFTR-mediated apical chloride current induced by a cell permeable cAMP analog CPT-cAMP and a direct CFTR activator genistein in T84 cell monolayers. Interestingly, this inhibitory effect of DHIS on CFTR was significantly (p<0.05) reduced by pretreatment with compound C, an AMPK inhibitor. AICAR, a known AMPK activator, was able to inhibit CFTR activity in both FRT-CFTR and T84 cells. Western blot analysis showed that DHIS induced AMPK activation in T84 cells, but not in FRT-CFTR cells. Our results indicate that DHIS inhibits CFTR-mediated chloride secretion in T84 cells, in part, by activation of AMPK activity. DHIS therefore represents a novel candidate of AMPK activators. © 2013 The Pharmaceutical Society of Japan.
ISSN: 13475215
Appears in Collections:Scopus 2011-2015

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