QUANTAL CA2+ MOBILIZATION STIMULATED BY INOSITOL 1,4,5-TRISPHOSPHATE IN PERMEABILIZED HEPATOCYTES

被引:91
作者
OLDERSHAW, KA [1 ]
NUNN, DL [1 ]
TAYLOR, CW [1 ]
机构
[1] UNIV CAMBRIDGE,DEPT PHARMACOL,TENNIS COURT RD,CAMBRIDGE CB2 1QJ,ENGLAND
关键词
D O I
10.1042/bj2780705
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
In several cell types, including hepatocytes, submaximal concentrations of Ins(1,4,5)P3 stimulate an initial rapid mobilization of intracellular Ca2+ stores that is followed by either no further Ca2+ release or very much slower release. Further additions of Ins(1,4,5)P3 then evoke further Ca2+ mobilization. Such 'incremental' responses [Meyer & Stryer (1990) Proc. Natl. Acad. Sci. U.S.A. 87, 3841-3845] could result from all-or-nothing emptying of stores that differ in their sensitivities to Ins(1,4,5)P3 or from partial emptying of stores that are more uniformly sensitive, but unable to release all of their Ca2+ because the response to Ins(1,4,5)P3 rapidly attenuates. By measuring unidirectional Ca-45(2+) efflux from intracellular stores stimulated with Ins(1,4,5)P3 under conditions where they continue to sequester Ca-40(2+), we provide evidence suggesting that Ins(1,4,5)P3 stimulates all-or-nothing emptying of stores that differ in their sensitivities to Ins(1,4,5)P3, a quantal response pattern.
引用
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页码:705 / 708
页数:4
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