Linked Life Data

3005271

Source:http://linkedlifedata.com/resource/pubmed/id/3005271

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pubmed-article:3005271pubmed:abstractTextNumerous hormones are known to rapidly activate polyphosphoinositide turnover in target cells by promoting phosphodiesteratic cleavage of the phospholipids; however, little is known about the enzymology of receptor-mediated phosphoinositide breakdown. In the present study, thyrotropin-releasing hormone (TRH) stimulation of polyphosphoinositide turnover has been characterized in electrically permeabilized, [3H]myoinositol-labeled GH3 cells. The permeable cells allow the influence of small molecular weight (Mr less than or equal to 1000) cofactors to be determined. We present evidence for the following: 1) TRH stimulates inositol phosphate generation in permeable cells; 2) optimal hormone-stimulated inositol phosphate generation requires Mg2+, ATP, and Ca2+; 3) Mg2+ and ATP requirements reflect polyphosphoinositide kinase reactions; 4) in the absence of MgATP, TRH stimulates the phosphodiesteratic breakdown of pre-existing polyphosphoinositides in a reaction which requires only low Ca2+ (10(-7) M); 5) hormone activation is potentiated in the presence of the stable guanine nucleotide, GTP gamma S; neither TRH-stimulated nor GTP gamma S-potentiated hydrolysis is inhibited by cholera or pertussis toxin treatment. These results demonstrate that hormone-induced phospholipid hydrolysis involves activation of a phosphoinositide phosphodiesterase; activation results in lowering the Ca2+ requirement of the phosphodiesterase such that maximal activity is observed at Ca2+ levels characteristic of a resting cell (10(-7) M). Furthermore, TRH regulation of polyphosphoinositide hydrolysis is modulated by guanine nucleotides; however, nucleotide regulation appears to involve a GTP-binding factor (Np) other than Ns or Ni.lld:pubmed
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pubmed-article:3005271pubmed:articleTitleThyrotropin-releasing hormone activates a Ca2+-dependent polyphosphoinositide phosphodiesterase in permeable GH3 cells. GTP gamma S potentiation by a cholera and pertussis toxin-insensitive mechanism.lld:pubmed
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pubmed-article:3005271pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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