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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/28766
Title: A plant-derived hydrolysable tannin inhibits CFTR chloride channel: A potential treatment of diarrhea
Authors: Nisa Wongsamitkul
Lalida Sirianant
Chatchai Muanprasat
Varanuj Chatsudthipong
Mahidol University
Keywords: Biochemistry, Genetics and Molecular Biology;Chemistry;Medicine;Pharmacology, Toxicology and Pharmaceutics
Issue Date: 1-Mar-2010
Citation: Pharmaceutical Research. Vol.27, No.3 (2010), 490-497
Abstract: Purpose: The present study examined the effects and mechanisms of actions of penta-m-digalloyl-glucose (PDG), a hydrolysable tannin extracted from Chinese gallnut, on cystic fibrosis transmembrane conductance regulator protein (CFTR). Materials and Methods: Fisher rat thyroid cells stably expressing human CFTR (FRT cells) and human intestinal T84 cells were used as cell models to investigate the effects of PDG on chloride secretion using short-circuit current analysis. The mechanisms by which PDG affected chloride secretion were also examined. Finally, in vivo antidiarrheal efficacy and effects of PDG on intestinal fluid absorption were evaluated in mouse closed-loop models. Results: In FRT cells, apical chloride current induced by forskolin, CPT-cAMP and apigenin were reversibly inhibited by PDG (IC50 ∼ 10μM) without effects on intracellular cAMP content and cell viability. Similarly, in T84 cells, PDG effectively inhibited chloride secretion induced by forskolin and cholera toxin. However, it had no effect on calcium-induced chloride secretion. In mice, a single intraluminal injection of PDG (0.6 mg/kg) reduced cholera toxin-induced intestinal fluid secretion by 75% with no effect on intestinal fluid absorption. Conclusions: PDG represents a new class of CFTR inhibitors. Further development of this class of compounds may provide a new therapeutic intervention for diarrhea. © 2009 Springer Science+Business Media, LLC.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=77949268932&origin=inward
http://repository.li.mahidol.ac.th/dspace/handle/123456789/28766
ISSN: 1573904X
07248741
Appears in Collections:Scopus 2006-2010

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