Phosphoinositide-specific phospholipase C activation in brain cortical membranes

作者: Michael A. Wallace , Enrique Claro , Helen R. Carter , John N. Fain

DOI: 10.1016/0076-6879(91)97144-N

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摘要: Publisher Summary This chapter describes a recently developed assay for carbachol-activated, guanine nucleotide-dependent phospholipase C stimulation using crude membrane preparations from rat brain cortex. The procedure is generally applicable to most regions, and it has been successfully used with rabbit brain. results of this demonstrate that carbachol (PLC)-β seen only in the presence guanosine-5′-triphosphate (GTP) or nonhydrolyzable GTP analog such as GppNHp GTPγS. Other purine pyrimidine nucleotides do not substitute. responses mediated by GTPγS are effectively inhibited GDP GDPβS. Thus, apparently works through G protein activate PLC-β. proteins mediate inhibitory inputs into signaling system. Dopamine inhibits activation PLC-β cortical membranes pharmacological characterization reveals effect dopamine occurs D l -type receptor. A dual NaF found there PLC activity an inhibition PI kinase. Addition AICl 3 potentiates former but no influence on latter. therefore suggest controls kinase membranes.

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