Caveolae Modulate the Activity of LRRC8-Mediated VRAC by the Structural Membrane Protein Caveolin-1

IF 3.3 3区 生物学 Q3 CELL BIOLOGY
Yan Liu, Xing Li, Cong Huo, Liming Hou, Xin Jia, Rong Xu, Jie Yang, Xiaoming Wang
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引用次数: 0

Abstract

The volume-regulated anion channel (VRAC) plays a critical role in cell volume regulation and other fundamental physiological processes. However, the mechanism of how VRAC is activated and modulated has not been completely clarified. Caveolin-1 (Cav-1), as an important ion channel binding protein, forms complexes with channel proteins and exchangers to regulate channel activity and function. The purpose of this study was to explore the importance and value of Cav-1 in cardiac VRAC activation and regulation. In the study, we proved that the membrane protein LRRC8A was detected in the same caveolae-enriched fractions, as the same as Caveolin-1 in ventricular myocytes. The intracellular Cl concentration increased and the cell volume decreased dramatically after caveolae being destroyed in cardiomyocytes. Moreover, we found that ICl,vol decreased not only in LRRC8A silencing cardiomyocytes but also in Cav-1 silencing cardiomyocytes, which indicated that caveolin-1 may affect the function of VRAC. Then we further explore the physical relationship between LRRC8A and Cav-1 in cell membrane. We observed that the fluorescence label of LRRC8A was overlapping with Cav-1 in the cell plasma membrane and caveolin-1 co-immunoprecipitated with LRRC8A, which demonstrated that Cav-1 is the basis of VRAC channel activation by acting on LRRC8A. The whole study provides further evidence of the relevance of Cav-1 on the activation and modulation of endothelial LRRC8A-mediated VRAC.

结构膜蛋白Caveolin-1调控lrrc8介导的VRAC活性
体积调节阴离子通道(VRAC)在细胞体积调节等基本生理过程中起着至关重要的作用。然而,VRAC如何被激活和调节的机制尚未完全阐明。Caveolin-1 (Cav-1)是一种重要的离子通道结合蛋白,与通道蛋白和交换物形成复合物,调节通道活性和功能。本研究旨在探讨Cav-1在心脏VRAC激活和调控中的重要性和价值。在本研究中,我们证明了膜蛋白LRRC8A与心室肌细胞中的Caveolin-1在相同的caveolae富集组分中被检测到。心肌细胞小泡破坏后,细胞内Cl-浓度显著升高,细胞体积显著减小。此外,我们发现不仅LRRC8A沉默心肌细胞,Cav-1沉默心肌细胞的ICl,vol也降低,提示caveolin-1可能影响VRAC的功能。然后我们进一步探讨LRRC8A与细胞膜中Cav-1的物理关系。我们观察到LRRC8A的荧光标记在细胞质膜上与Cav-1重叠,与LRRC8A共免疫沉淀,说明Cav-1是通过作用于LRRC8A激活VRAC通道的基础。整个研究进一步证明了Cav-1与内皮细胞lrrc8a介导的VRAC的激活和调节的相关性。
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来源期刊
Cell Biology International
Cell Biology International 生物-细胞生物学
CiteScore
7.60
自引率
0.00%
发文量
208
审稿时长
1 months
期刊介绍: Each month, the journal publishes easy-to-assimilate, up-to-the minute reports of experimental findings by researchers using a wide range of the latest techniques. Promoting the aims of cell biologists worldwide, papers reporting on structure and function - especially where they relate to the physiology of the whole cell - are strongly encouraged. Molecular biology is welcome, as long as articles report findings that are seen in the wider context of cell biology. In covering all areas of the cell, the journal is both appealing and accessible to a broad audience. Authors whose papers do not appeal to cell biologists in general because their topic is too specialized (e.g. infectious microbes, protozoology) are recommended to send them to more relevant journals. Papers reporting whole animal studies or work more suited to a medical journal, e.g. histopathological studies or clinical immunology, are unlikely to be accepted, unless they are fully focused on some important cellular aspect. These last remarks extend particularly to papers on cancer. Unless firmly based on some deeper cellular or molecular biological principle, papers that are highly specialized in this field, with limited appeal to cell biologists at large, should be directed towards journals devoted to cancer, there being very many from which to choose.
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