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    Hydroxylase inhibition attenuates colonic epithelial secretory function and ameliorates experimental diarrhea.

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    Authors
    Ward, Joseph B J
    Lawler, Karen
    Amu, Sylvie
    Taylor, Cormac T
    Fallon, Padraic G
    Keely, Stephen J
    Affiliation
    Molecular Medicine Laboratories, Royal College of Surgeons in Ireland, Beaumont Hospital, Dublin, Ireland.
    Issue Date
    2011-02
    
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    Citation
    Hydroxylase inhibition attenuates colonic epithelial secretory function and ameliorates experimental diarrhea. 2011, 25 (2):535-43 FASEB J.
    Journal
    The FASEB journal : official publication of the Federation of American Societies for Experimental Biology
    URI
    http://hdl.handle.net/10147/126120
    DOI
    10.1096/fj.10-166983
    PubMed ID
    20944011
    Abstract
    Hydroxylases are oxygen-sensing enzymes that regulate cellular responses to hypoxia. Transepithelial Cl(-) secretion, the driving force for fluid secretion, is dependent on O(2) availability for generation of cellular energy. Here, we investigated the role of hydroxylases in regulating epithelial secretion and the potential for targeting these enzymes in treatment of diarrheal disorders. Ion transport was measured as short-circuit current changes across voltage-clamped monolayers of T(84) cells and mouse colon. The antidiarrheal efficacy of dimethyloxallyl glycine (DMOG) was tested in a mouse model of allergic disease. Hydroxylase inhibition with DMOG attenuated Ca(2+)- and cAMP-dependent secretory responses in voltage-clamped T(84) cells to 20.2 ± 2.6 and 38.8 ± 6.7% (n=16; P≤0.001) of those in control cells, respectively. Antisecretory actions of DMOG were time and concentration dependent, being maximal after 18 h of DMOG (1 mM) treatment. DMOG specifically inhibited Na(+)/K(+)-ATPase pump activity without altering its expression or membrane localization. In mice, DMOG inhibited agonist-induced secretory responses ex vivo and prevented allergic diarrhea in vivo. In conclusion, hydroxylases are important regulators of epithelial Cl(-) and fluid secretion and present a promising target for development of new drugs to treat transport disorders.
    Item Type
    Article
    Language
    en
    ISSN
    1530-6860
    ae974a485f413a2113503eed53cd6c53
    10.1096/fj.10-166983
    Scopus Count
    Collections
    Beaumont Hospital

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