Roles of protein kinases in neurotransmitter responses in Xenopus oocytes injected with rat brain mRNA

I. Ito, C. Hirono, S. Yamagishi, Y. Nomura, S. Kaneko, H. Sugiyama

研究成果: ジャーナルへの寄稿学術誌査読

29 被引用数 (Scopus)


Microinjection of rat brain mRNA in Xenopus oocytes induced acetylcholine, neuroteisin, serotonin, and glutamate receptors in the cells. These receptors stimulate an intracellular reaction pathway, including G‐protein activation, inositol trisphosphate (IP3) formation, and Ca2+‐dependent CI channels. In the present study, we examined the roles of several protein kinases in these responses by means of inhibitors and activators of these kinases. Isoquinolinesulfonamides, inhibitors of protein kinases, caused no current responses and affected no receptor‐mediated responses when injected into the oocytes at low doses (30–50 pmol), which inhibit cyclic nucleotide‐dependent kinases or kinase C specifically, but abolished the receptor‐mediated responses at a higher dose (300 pmol), which inhibit most protein kinases nonspecifically. Calmodulin inhibitors blocked the receptor‐mediated responses strongly. Activation of cyclic nucleotide‐dependent kinases or kinase C by injection of cAMP (or cGMP) or perfusion with phorbol esters caused no direct current responses but suppressed receptor‐mediated responses. Current responses triggered by IP3 injection were not suppressed by these treatments. These results suggest that cAMP‐ (or cGMP‐)dependent kinases or kinase C may not be involved in the pathway directly but may modulate it by inhibiting the initial part of the pathway (receptors, G‐proteins, and/or phospholipase C), and they suggest that calmodulin may most likely be involved in the activation of Ca2+‐dependent CI channels.

ジャーナルJournal of cellular physiology
出版ステータス出版済み - 1月 1988

!!!All Science Journal Classification (ASJC) codes

  • 生理学
  • 臨床生化学
  • 細胞生物学


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