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G-protein and ion channels. Toshihide NUKADA 1 1Division of Neurochemistry, Institute of Brain Research, Faculty of Medicine, University of Tokyo pp.961-967
Published Date 1991/12/10
DOI https://doi.org/10.11477/mf.1431900196
  • Abstract
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Three distinct subtypes of Giα (the α-subunit of the G-protein linked to inhibition of adenylate cyclase, Gi) have recently been described. In order to study the physiological role of each of these subtypes, we have investigated changes in receptor-mediated signal transduction induced by the expres-sion of different Gia cDNAs in cultured cells. RNA blot hybridization analysis and immunoblot analysis showed that NG108-15 neuroblastoma-glioma hybrid cells contain endogenous Gi2α and Gi3α but no detectable amounts of Gi1α. NG108-15 cells were then transfected with expression vectors containing cDNA encoding Gi1α, Gi2α or Gi3α. Exogenously-derived Gi1α expressed in NG108-15 cells was found to suppress bradykinin-induced phospholipase C activity. Neither exogenously-expressed Gi2α nor Gi3α affected this activity. By contrast, only exogenous Gi3α mediated the inhibition of voltage-dependent high-threshold Ca2+ current via muscarinic acetylcholine receptors. These results suggest that each Giα transduces distinct signals generated by cell surface receptors.


Copyright © 1991, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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