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15305863

Source:http://linkedlifedata.com/resource/pubmed/id/15305863

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pubmed-article:15305863pubmed:dateCreated2004-8-12lld:pubmed
pubmed-article:15305863pubmed:abstractTextmGluR1 and mGluR5 of the metabotropic glutamate receptor family are coupled to inositol trisphosphate-Ca2+ signal cascades and evoke distinct Ca2+ responses in neural cells and heterologously expressing cells. In heterologous cells, stimulation of recombinant mGluR1 evokes a single-peaked Ca2+ response whereas mGluR5 elicits an oscillatory Ca2+ response. The distinct Ca2+ responses are interchangeable by single amino substitution of aspartate for threonine at the corresponding position of the carboxy-terminal cytoplasmic regions of mGluR1 and mGluR5, respectively. In this investigation, we generated knock-in mice, termed mGluR1 D854T mice, in which aspartate of mGluR1 was replaced with threonine. We examined the effect of this D854T substitution on Ca2+ and current responses mediated by mGluR1 in cultured cerebellar Purkinje cells. Stimulation of mGluR1 D854T by a group 1 mGluR agonist, 3,5-dihydroxyphenylglycine (DHPG) evoked, as in wild-type mGluR1, only single-peaked Ca2+ responses as measured by Ca2+ fluorometric analysis. We then examined mGluR1-induced inward currents carried by nonselective cation channels during whole-cell recordings from cultured Purkinje cells. The mGluR1 D854T mutation abolished the responsiveness of mGluR1 to low concentrations of DHPG (0.5-500 nM) and reduced its desensitization during prolonged agonist application. mGluR1 D854T homozygous mutants showed no apparent behavioural abnormality as analysed by motor movement tests. These results indicate that, although additional modulatory mechanisms seem to be required to produce oscillatory Ca2+ responses of mGluR1, the single amino acid substitution at position 854 of mGluR1 is capable of influencing the kinetics of neuronal mGluR1 responses, most probably through PKC-mediated phosphorylation.lld:pubmed
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pubmed-article:15305863pubmed:authorpubmed-author:KatsukiMotoya...lld:pubmed
pubmed-article:15305863pubmed:authorpubmed-author:TabataToshihi...lld:pubmed
pubmed-article:15305863pubmed:authorpubmed-author:KanoMasanobuMlld:pubmed
pubmed-article:15305863pubmed:authorpubmed-author:NakamuraKenji...lld:pubmed
pubmed-article:15305863pubmed:authorpubmed-author:NakanishiShig...lld:pubmed
pubmed-article:15305863pubmed:authorpubmed-author:SatoMasaakiMlld:pubmed
pubmed-article:15305863pubmed:authorpubmed-author:KitanoJunJlld:pubmed
pubmed-article:15305863pubmed:authorpubmed-author:HashimotoKoui...lld:pubmed
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pubmed-article:15305863pubmed:authorpubmed-author:MoriyoshiKoki...lld:pubmed
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pubmed-article:15305863pubmed:dateRevised2007-11-15lld:pubmed
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pubmed-article:15305863pubmed:year2004lld:pubmed
pubmed-article:15305863pubmed:articleTitleAltered agonist sensitivity and desensitization of neuronal mGluR1 responses in knock-in mice by a single amino acid substitution at the PKC phosphorylation site.lld:pubmed
pubmed-article:15305863pubmed:affiliationDepartment of Molecular and System Biology, Graduate School of Biostudies, Kyoto University, Kyoto 606-8501, Japan.lld:pubmed
pubmed-article:15305863pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15305863pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:15305863pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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