Acetylcholine‐ and inositol 1,4,5‐trisphosphate‐induced calcium mobilization in Xenopus laevis oocytes

FEBS Letters

Gillo, Boaz¹  Nadler, Etta¹  Lass, Yoram¹  Oron, Yoram¹ 

[1] Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv 69978, Israel

关键词: Inositol trisphosphate;    Ca2+ mobilization;    Muscarinic response;    (Xenopus);    Oocyte;   

DOI  :  10.1016/0014-5793(86)80481-1

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Acetylcholine induces a complex electrical membrane response in Xenopus laevis oocytes. This response is mimicked, and probably mediated by injected inositol 1,4,5-trisphosphate. Oocytes prelabelled with ⁴⁵Ca released calcium in two phases, the second, slow phase exhibiting first order kinetics of release. Brief exposure of prelabelled oocytes to acetylcholine resulted in a significant increase in the rate of calcium release that returned to control values 2-3 min following the removal of the neurotransmitter. Intracellular injection of inositol 1,4,5-trisphosphate resulted in increased rate of calcium release similar to, but longer than that caused by acetylcholine. Experiments conducted on single oocytes permitted the investigation of the relationship between acetylcholine-induced and inositol 1,4,5-trisphosphate-induced calcium mobilization and the resulting electrical membrane response. Our data reinforce our previous suggestion that inositol 1,4,5-trisphosphate is the intracellular second messenger of the muscarinic membrane electrical response in Xenopus oocytes.

【 授权许可】

Unknown