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Published on: February 17, 2017

Isoform- and receptor-specific channel property of canonical transient receptor potential (TRPC)1/4 channels

Jinsung Kim1, Misun Kwak, Jae-Pyo Jeon

  • 1Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea.

Pflugers Archiv : European Journal of Physiology
|August 17, 2013
PubMed

Insights

Transient receptor potential canonical (TRPC) 1/4 channels exhibit dynamic gating. TRPC1α/4 currents are activated by Gq/11-coupled receptors, while TRPC1β/4 show mild activation, and Gi/o-coupled receptors activate TRPC4 homomers.

Area of Science:

  • Ion Channels
  • Molecular Physiology
  • Cell Signaling

Background:

  • Transient receptor potential canonical (TRPC) 1 is a widely expressed mammalian channel involved in numerous physiological processes.
  • TRPC1 functionality is complex, often depending on heteromeric assembly with other TRPC channels like TRPC4.
  • The TRPC1 gene has splicing variants, TRPC1α (long) and TRPC1β (short), potentially influencing channel function.

Purpose of the Study:

  • To investigate the functional differences between TRPC1α/4 and TRPC1β/4 channels.
  • To determine the role of TRPC1 isoforms in channel gating under different receptor stimulation conditions.
  • To elucidate the pore-forming versus ancillary subunit roles of TRPC1α when co-expressed with TRPC4.

Main Methods:

  • Co-expression of TRPC1 isoforms (TRPC1α, TRPC1β) with TRPC4 in mammalian cells.
  • Activation of Gq/11-coupled receptors (M1, M3) and Gi/o-coupled receptors (M2) to induce channel activity.
  • Electrophysiological recordings to measure ion currents and assess channel gating properties.

Main Results:

  • Gq/11-coupled receptor stimulation significantly increased TRPC1α/4 currents but only mildly activated TRPC1β/4 currents.
  • TRPC1α acted as a pore-constituting subunit in TRPC1α/4 channels, generating strong pore field strength.
  • Gi/o-coupled receptor stimulation failed to activate TRPC1/4 channels but selectively activated TRPC4 homomeric channels.

Conclusions:

  • TRPC1/4 channel gating is dynamically regulated by specific TRPC1 isoforms (α vs. β).
  • The type of upstream receptor stimulation (Gq/11 vs. Gi/o-coupled) critically influences TRPC1/4 channel activity.
  • Understanding TRPC1 isoform specificity and activation pathways is crucial for comprehending TRPC1 and TRPC1/4 channel physiology.

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