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TRIC-A shapes oscillatory Ca2+ signals by interaction with STIM1/Orai1 complexes.
PLOS Biology ( IF 7.8 ) Pub Date : 2020-04-24 , DOI: 10.1371/journal.pbio.3000700
Niroj Shrestha 1 , Bernadett Bacsa 1 , Hwei Ling Ong 2 , Susanne Scheruebel 1 , Helmut Bischof 3 , Roland Malli 3 , Indu Suresh Ambudkar 2 , Klaus Groschner 1
Affiliation  

Trimeric intracellular cation (TRIC) channels have been proposed to modulate Ca2+ release from the endoplasmic reticulum (ER) and determine oscillatory Ca2+ signals. Here, we report that TRIC-A-mediated amplitude and frequency modulation of ryanodine receptor 2 (RyR2)-mediated Ca2+ oscillations and inositol 1,4,5-triphosphate receptor (IP3R)-induced cytosolic signals is based on attenuating store-operated Ca2+ entry (SOCE). Further, TRIC-A-dependent delay in ER Ca2+ store refilling contributes to shaping the pattern of Ca2+ oscillations. Upon ER Ca2+ depletion, TRIC-A clusters with stromal interaction molecule 1 (STIM1) and Ca2+-release-activated Ca2+ channel 1 (Orai1) within ER-plasma membrane (PM) junctions and impairs assembly of the STIM1/Orai1 complex, causing a decrease in Orai1-mediated Ca2+ current and SOCE. Together, our findings demonstrate that TRIC-A is a negative regulator of STIM1/Orai1 function. Thus, aberrant SOCE could contribute to muscle disorders associated with loss of TRIC-A.

中文翻译:


TRIC-A 通过与 STIM1/Orai1 复合物相互作用形成振荡 Ca2+ 信号。



三聚体细胞内阳离子 (TRIC) 通道已被提议调节内质网 (ER) 的 Ca2+ 释放并确定振荡 Ca2+ 信号。在这里,我们报道 TRIC-A 介导的兰尼碱受体 2 (RyR2) 介导的 Ca2+ 振荡和肌醇 1,4,5-三磷酸受体 (IP3R) 诱导的胞质信号的幅度和频率调节是基于减弱钙池操作的 Ca2+条目(SOCE)。此外,ER Ca2+ 储存再填充中 TRIC-A 依赖性延迟有助于塑造 Ca2+ 振荡模式。内质网 Ca2+ 耗尽后,TRIC-A 与内质网质膜 (PM) 连接内的基质相互作用分子 1 (STIM1) 和 Ca2+ 释放激活的 Ca2+ 通道 1 (Orai1) 聚集,并损害 STIM1/Orai1 复合物的组装,从而导致Orai1 介导的 Ca2+ 电流和 SOCE 降低。总之,我们的研究结果表明 TRIC-A 是 STIM1/Orai1 功能的负调节因子。因此,异常的 SOCE 可能导致与 TRIC-A 缺失相关的肌肉疾病。
更新日期:2020-04-24
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