Modulation of calcium signalling by dominant negative splice variant of ryanodine receptor subtype 3 in native smooth muscle cells

被引:32
|
作者
Dabertrand, Fabrice
Morel, Jean-Luc
Sorrentino, Vincenzo
Mironneau, Jean
Mironneau, Chantal
Macrez, Nathalle
机构
[1] Univ Bordeaux 2, Lab Signalisat & Interact Cellulaires, CNRS, UMR5017, F-33076 Bordeaux, France
[2] Univ Hosp Sienna, Mol Med Unit, Dept Neurosci, I-53100 Siena, Italy
关键词
D O I
10.1016/j.ceca.2006.03.008
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
The ryanodine receptor Subtype 3 (RYR3) is expressed ubiquitously but its physiological function varies from cell to cell. Here, we investigated the role of a dominant negative RYR3 isoforni in Ca2+ signalling in native smooth muscle cells. We used intranuclear injection of antisense oligonucleotides to specifically inhibit endogenous RYR3 isoform expression. In mouse duodenum myocytes expressing RYR2 subtype and both spliced and non-spliced RYR3 isoforms, RYR2 and non-spliced RYR3 were activated by caffeine whereas the spliced RYR3 was not. Only RYR2 was responsible for the Ca2+-induced Ca2+ release mechanism that amplified Ca2+ influx- or inositol 1,4,5-trisphosphate-induced Ca2+ signals. However, the spliced RYR3 negatively regulated RYR2 leading to the decrease of amplitude and upstroke velocity of Ca2+ signals. Immunostaining in injected cells showed that the spliced RYR3 was principally expressed near the plasma membrane whilst the non-spliced isoform was revealed around the nucleus. This study shows for the first time that the short isoform of RYR3 controls Ca2+ release through RYR2 in native smooth muscle cells. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:11 / 21
页数:11
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