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The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
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TRPC1-5-5-5 heteromer as a sodium sensor.

Hana Kang1, Jinhyeong Kim1, Insuk So1

  • 1Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea.

Biochemical and Biophysical Research Communications
|July 5, 2025
PubMed
Summary

Researchers identified how TRPC1 and TRPC5 channels combine and activate. Increased internal sodium selectively activates TRPC1/5 channels, revealing crucial molecular mechanisms for TRPC channel function.

Keywords:
ConcatemerEnglerin AG proteinInternal calciumInternal sodiumTRPC1/5 heteromerTRPC5

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Area of Science:

  • Molecular biology
  • Cell physiology
  • Ion channel research

Background:

  • Transient Receptor Potential Canonical (TRPC) channels are crucial for calcium (Ca²⁺) permeability in mammalian cells.
  • TRPC5, a non-selective cation channel, is involved in membrane depolarization and calcium influx.
  • TRPC5 forms homotetramers and heterotetramers with TRPC1, suggesting complex channel assembly and function.

Purpose of the Study:

  • To investigate the subunit composition and activation mechanisms of TRPC1/5 channels.
  • To confirm optimal co-expression of TRPC1-5 and TRPC5-5 concatemers.
  • To elucidate the role of Gi2QL, internal calcium, and sodium in TRPC1/5 channel activity.

Main Methods:

  • Optimal co-expression of TRPC1-5 and TRPC5-5 concatemers.
  • Gi2QL activation experiments to assess concatemeric current.
  • Manipulation of internal calcium and sodium concentrations to study channel activation.
  • Structural modeling to identify potential Na⁺-binding sites.

Main Results:

  • Gi2QL activation leads to ideal concatemeric current for both TRPC1-5 and TRPC5-5.
  • Increased internal calcium exclusively activates the TRPC5-5 homomeric concatemer.
  • Increased internal sodium selectively activates the TRPC1-5-5-5 concatemer.
  • Structural modeling suggests a Na⁺-binding site at the TRPC1-5 interface.

Conclusions:

  • The study clarifies the subunit composition of TRPC1/5 channels.
  • Molecular mechanisms for TRPC1/5 channel activation by ions have been elucidated.
  • Identified sodium sensitivity provides insights into channel gating and regulation.