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Updated: Oct 3, 2026

Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
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Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy

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TRPC6 is a candidate channel involved in receptor-stimulated cation currents in A7r5 smooth muscle cells

Silke Jung1, Rainer Strotmann, Günter Schultz

  • 1Institut für Pharmakologie, Freie Universität Berlin, 14195 Berlin, Germany.

American Journal of Physiology. Cell Physiology
|January 15, 2002
PubMed

Insights

This study identifies Transient Receptor Potential Canonical 6 (TRPC6) channels as key players in [Arg(8)]-vasopressin-induced calcium entry in aortic smooth muscle cells, crucial for vasoconstriction.

Area of Science:

  • Physiology
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Mammalian transient receptor potential (TRP) channels are implicated in cellular signaling.
  • Calcium (Ca2+) influx is vital for vascular smooth muscle cell function, including vasoconstriction.

Purpose of the Study:

  • To investigate the role of TRP channels in [Arg(8)]-vasopressin (AVP)-induced Ca2+ entry in A7r5 aortic smooth muscle cells.
  • To identify specific TRPC isoforms involved in receptor-stimulated cation currents.

Main Methods:

  • Whole-cell patch-clamp recordings to analyze ion channel activity.
  • Stimulation of cells with AVP, G protein activators, and growth factors.
  • Northern hybridization to detect TRPC mRNA expression.

Main Results:

  • AVP induced Ca2+ release and influx in A7r5 cells.
  • A nonselective cation current, activated by AVP and G proteins, was identified.
  • This current was stimulated by 1-oleoyl-2-acetyl-sn-glycerol independently of protein kinase C.
  • Flufenamate enhanced the cation currents, similar to TRPC6.
  • TRPC1 and TRPC6 mRNA were detected in A7r5 cells.

Conclusions:

  • TRPC6 is suggested to be a molecular component of the receptor-stimulated Ca2+-permeable cation channels in vascular smooth muscle cells.
  • These findings contribute to understanding the molecular mechanisms of vasoconstriction.

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