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• W2019011770 abstract "Gap junction proteins, connexins, provide intercellular channels that allow ions and small signaling molecules to be transmitted to adjacent coupled cells. Besides this function, it is becoming apparent that connexins also exert channel-independent effects, which are likely mediated by processes involving protein–protein interactions. Although a number of connexin interacting proteins have been identified, only little is known about the functional consequences of such interactions. We have previously shown that deletion of the astrocytic gap junction protein, connexin43 (Cx43) causes a right-ward shift in the dose-response curve to P2Y1R agonists and decreased P2Y1R expression levels. To evaluate whether these changes were due to reduced gap junctional communication or to protein–protein interactions, Cx43-null astrocytes were transfected with full-length Cx43 and Cx43 domains, and P2Y1R function and expression levels evaluated. Results indicate that restoration of P2Y1R function is independent of gap junctional communication and that the Cx43 carboxyl terminus spanning the SH3 binding domain (260–280) participates in the rescue of P2Y1R pharmacological behavior (shifting to the left the P2Y1R dose-response curve) without affecting its expression levels. These results suggest that the Cx43 carboxyl-terminus domain provides a binding site for an intracellular molecule, most likely a member of the c-Src tyrosine kinase family, which affects P2Y1R-induced calcium mobilization. It is here proposed that a nonchannel function of Cx43 is to serve as a decoy for such kinases. Such modulation of P2Y1R is expected to influence several neural cell functions, especially under inflammation and neurodegenerative disorders where expression levels of Cx43 are decreased. © 2007 Wiley-Liss, Inc." @default.
• W2019011770 created "2016-06-24" @default.
• W2019011770 creator A5033898851 @default.
• W2019011770 date "2008-01-15" @default.
• W2019011770 modified "2023-09-24" @default.
• W2019011770 title "Modulation of astrocyte P2Y₁receptors by the carboxyl terminal domain of the gap junction protein Cx43" @default.
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• W2019011770 doi "https://doi.org/10.1002/glia.20598" @default.
• W2019011770 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2636557" @default.
• W2019011770 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17990308" @default.
• W2019011770 hasPublicationYear "2008" @default.
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