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STIM1 long and STIM1 gate differently TRPC1 during store-operated calcium entry.
Cell Calcium ( IF 4.3 ) Pub Date : 2019-12-03 , DOI: 10.1016/j.ceca.2019.102134
Agnieszka Dyrda 1 , Stéphane Koenig 1 , Maud Frieden 2
Affiliation  

During myogenesis, a long splice variant of STIM1, called STIM1L is getting expressed, while the level of STIM1 remains constant. Previous work demonstrated that STIM1L is more efficient in eliciting store-operated Ca2+ entry (SOCE), but no current analysis of the channel(s) activated by this new STIM1L isoform was performed until now. In this study, we investigate the ionic channel(s) activated by STIM1L and whether differences exist between the two STIM1 isoforms, using HEK-293 T cells as a model system. Our data show that STIM1 and STIM1L activate Orai1 channel but also the endogenously expressed TRPC1. The channel activation occurs in two steps, with first Orai1 activation followed, in a subset of cells, by TRPC1 opening. Remarkably, STIM1L more frequently activates TRPC1 and preferentially interacts with TRPC1. In low intracellular Ca2+ buffering condition, the frequency of TRPC1 opening increases significantly, strongly suggesting a Ca2+-dependent channel activation. The ability of STIM1L to open Orai1 appears decreased compared to STIM1, which might be explained by its stronger propensity towards TRPC1. Indeed, increasing the amount of STIM1L results in an enhanced Orai1 current. The role of endogenous TRPC1 in STIM1- and STIM1L-induced SOCE was confirmed by Ca2+ imaging experiments. Overall, our findings provide a detailed analysis of the channels activated by both STIM1 isoforms, revealing that STIM1L is more prone to open TRPC1, which might explain the larger SOCE elicited by this isoform.

中文翻译:

存储操作的钙进入过程中,STIM1长和STIM1门的TRPC1不同。

在肌发生过程中,表达了称为STIM1L的STIM1的长剪接变体,而STIM1的水平保持恒定。先前的工作表明,STIM1L在引发存储操作的Ca2 +条目(SOCE)方面更为有效,但是到目前为止,尚未对该新的STIM1L同工型激活的通道进行当前分析。在这项研究中,我们使用HEK-293 T细胞作为模型系统,研究了STIM1L激活的离子通道以及两种STIM1同工型之间是否存在差异。我们的数据表明,STIM1和STIM1L激活了Orai1通道,但也激活了内源表达的TRPC1。通道激活分为两个步骤,首先是Orai1激活,其次是在子集的单元格中打开TRPC1。值得注意的是,STIM1L更频繁地激活TRPC1,并优先与TRPC1交互。在低细胞内Ca2 +缓冲条件下,TRPC1开放的频率显着增加,强烈暗示了Ca2 +依赖性通道的激活。与STIM1相比,STIM1L打开Orai1的能力似乎降低了,这可能是由于其更倾向于TRPC1的缘故。确实,增加STIM1L的量会导致Orai1电流增加。Ca2 +成像实验证实了内源性TRPC1在STIM1和STIM1L诱导的SOCE中的作用。总体而言,我们的发现对两种STIM1亚型激活的通道进行了详细分析,表明STIM1L更倾向于打开TRPC1,这可能解释了这种亚型引起的更大的SOCE。与STIM1相比,STIM1L打开Orai1的能力似乎降低了,这可能是由于其更倾向于TRPC1的缘故。确实,增加STIM1L的量会导致Orai1电流增加。Ca2 +成像实验证实了内源性TRPC1在STIM1和STIM1L诱导的SOCE中的作用。总体而言,我们的发现对两种STIM1亚型激活的通道进行了详细分析,表明STIM1L更倾向于打开TRPC1,这可能解释了这种亚型引起的更大的SOCE。与STIM1相比,STIM1L打开Orai1的能力似乎降低了,这可能是由于其更倾向于TRPC1的缘故。确实,增加STIM1L的量会导致Orai1电流增加。Ca2 +成像实验证实了内源性TRPC1在STIM1和STIM1L诱导的SOCE中的作用。总体而言,我们的发现对两种STIM1亚型激活的通道进行了详细分析,表明STIM1L更倾向于打开TRPC1,这可能解释了这种亚型引起的更大的SOCE。
更新日期:2019-12-04
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