1998年3月
Differential regulation of N- and Q-type Ca2+ channels by cyclic nucleotides and G-proteins
LIFE SCIENCES
- ,
- ,
- 巻
- 62
- 号
- 17-18
- 開始ページ
- 1543
- 終了ページ
- 1547
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/S0024-3205(98)00104-0
- 出版者・発行元
- PERGAMON-ELSEVIER SCIENCE LTD
Voltage-dependent Ca2+ channels play a central role in controlling neurotransmitter release at the synapse. They can be inhibited by certain G-protein-coupled receptors, acting by a pathway delimited to the membrane. In addition, modulation of Ca2+ channel activity by protein kinases also contributes to the dynamic regulation of neuronal physiology. Recently, differences in these modulations between Ca2+ channel subtypes have been shown in several neuronal preparations. Here we show that two types of presynaptic Ca2+ channel (N-type and Q-type) are differentially regulated by cAMP and G-proteins using a Xenopus oocyte expression system. Treatment to increase cytosolic cAMP concentration with forskolin and 3-isobutyl-1-methylxanthine (IBMX) markedly potentiated Q-type channel current, and the enhancement was reversed by protein kinase A inhibitors. Much smaller enhancement was observed in N-type channel current after the cAMP elevation. When large depolarizing prepulse was applied to the oocytes for evaluation of the tonic inhibition of Ca2+ channels by intrinsic G-protein activity, N-type channel current elicited a large prepulse facilitation but Q-type channels did not. The tonic inhibition of N-type channels was abolished by an intracellular perfusion with a 'cut-open' recording configuration, or by co-expression with G(alpha o). When kappa opioid receptors were co-expressed and stimulated with agonists, depolarization-resistant inhibition was more apparent in Q-type channels than in N-type channels. These results suggest that Q-type channels are more susceptible to the protein kinase A-mediated facilitation than N-type channels, and that activity of N-type channels can be more highly regulated in a voltage-dependent manner by G(beta gamma) than that of Q-type channels. These differences may account for the selective regulation of neurotransmitter release by these Ca2+ channels.
- リンク情報
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- DOI
- https://doi.org/10.1016/S0024-3205(98)00104-0
- J-GLOBAL
- https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200902108319781762
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/9585133
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000072850800019&DestApp=WOS_CPL
- URL
- http://www.scopus.com/inward/record.url?eid=2-s2.0-0032571342&partnerID=MN8TOARS
- URL
- http://orcid.org/0000-0001-5152-5809
- ID情報
-
- DOI : 10.1016/S0024-3205(98)00104-0
- ISSN : 0024-3205
- J-Global ID : 200902108319781762
- ORCIDのPut Code : 25904682
- PubMed ID : 9585133
- SCOPUS ID : 0032571342
- Web of Science ID : WOS:000072850800019