Abstract:
:Long-term (12 h) incubation of NCB-20 neuroblastoma x Chinese hamster brain cell hybrid cells with phorbol dibutylate caused a decrease in the enzyme activity of protein kinase C (PKC). Under these conditions, the formation of inositol 1,4,5-trisphosphate [Ins(1,4,5)P(3)] and the mobilization of intracellular Ca(2+) triggered by bradykinin (BK), were significantly increased. The alterations in BK-triggered membrane currents in the PKC down-regulated cells were also observed: enhancement of outward currents and decreased inward currents. These results strongly suggested that down-regulation of PKC enhanced BK-induced phosphoinositide metabolism by relieving from the negative feedback control operating between the receptor and phospholipase C, and that the increased Ca(2+) responses due to accumulated Ins(1,4,5)P(3) lead to enhanced outward currents.
journal_name
Neurochem Intjournal_title
Neurochemistry internationalauthors
Okano Y,Higashida H,Tao F,Sakai T,Nozawa Ydoi
10.1016/0197-0186(91)90175-dsubject
Has Abstractpub_date
1991-01-01 00:00:00pages
419-24issue
3eissn
0197-0186issn
1872-9754pii
0197-0186(91)90175-Djournal_volume
18pub_type
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