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Published on: December 31, 2013
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TRPCs as MS Channels
Owen P Hamill1, Rosario Maroto1
1Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, Texas 77555.
Current Topics in Membranes
|August 30, 2014
Summary
Canonical transient receptor potential (TRPC) channels are mechanosensitive (MS) and function as mechano-operated channels (MOCs). Evidence suggests TRPC channels are regulated by mechanical forces through various direct and indirect mechanisms.
Area of Science:
- Cellular Biology
- Molecular Physiology
- Ion Channel Function
Background:
- Canonical transient receptor potential (TRPC) channels are known for their roles as store-operated and receptor-operated channels (SOCs and ROCs).
- Emerging evidence suggests these TRPC channels possess mechanosensitive (MS) properties, indicating a broader functional repertoire.
- Understanding the mechanosensitivity of TRPC channels is crucial for elucidating their roles in cellular signaling and mechanotransduction.
Purpose of the Study:
- To review and synthesize recent evidence on the mechanosensitive (MS) functions of canonical transient receptor potential (TRPC) channels.
- To explore the potential mechanisms by which mechanical forces regulate TRPC channel activity.
- To discuss strategies for differentiating various MS gating mechanisms in TRPC channels.
Main Methods:
- Literature review of recent experimental evidence.
- Analysis of proposed molecular mechanisms for TRPC channel mechanosensitivity.
- Discussion of experimental approaches to dissect MS gating pathways.
Main Results:
- TRPC channels can be classified as mechano-operated channels (MOCs) due to direct or indirect mechanosensitivity.
- Mechanical forces may regulate TRPC channels via conformational coupling to internal Ca(2+) stores.
- TRPC channels are also modulated by lipidic second messengers generated by mechanosensitive enzymes.
Conclusions:
- Multiple non-exclusive mechanisms contribute to TRPC channel mechanosensitivity.
- These mechanisms include direct sensitivity to membrane mechanics, physical coupling to cellular structures, and lipid signaling.
- Further research is needed to elucidate the specific roles of different MS gating mechanisms in various TRPC channel subtypes.
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