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Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels
11:34

Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels

Published on: December 24, 2013

Distribution of TRPC channels in a visceral sensory pathway

Maria Buniel1, Brian Wisnoskey, Patricia A Glazebrook

  • 1Rammelkamp Center for Education and Research, MetroHealth Campus of Case Western Reserve University, 2500 MetroHealth Drive, Cleveland, OH 44109-1998, USA.

Novartis Foundation Symposium
|April 24, 2004
PubMed

Insights

Transient Receptor Potential Canonical (TRPC) channels are vital for carotid body function. This study maps TRPC protein distribution in rat carotid chemosensory pathways, revealing specific channel roles in sensory neurons and their terminals.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Physiology

Background:

  • Studies on Transient Receptor Potential Canonical (TRPC) channel activation primarily used heterologous systems.
  • Lack of specific TRPC channel antagonists hindered functional studies of endogenous channels.

Purpose of the Study:

  • To investigate the role of TRPC channels in native tissues by examining their distribution in the rat carotid chemosensory pathway.
  • To understand the differential localization of TRPC proteins in sensory neurons projecting to the carotid body and the nucleus of the solitary tract.

Main Methods:

  • Immunohistochemical analysis of TRPC channel protein distribution in rat petrosal ganglion, carotid body, and nucleus of the solitary tract.
  • Correlation of TRPC expression with neuronal fiber diameter and projection targets.

Main Results:

  • TRPC3/4/5/6 and TRPC7 were found in petrosal ganglion neurons; TRPC1 was in a subpopulation projecting to the carotid body.
  • TRPC1/3/4/5 or TRPC6 were in small unmyelinated fibers to the carotid body; TRPC1 and TRPC3 were in larger fibers.
  • TRPC1 and TRPC4 were localized to terminal endings in carotid body glomus cell clusters; TRPC4 and TRPC5 were in central axons projecting to the nucleus of the solitary tract.

Conclusions:

  • TRPC channels exhibit differential distribution within the carotid chemosensory pathway.
  • Specific TRPC channels (TRPC1, TRPC4) are present at the sensory terminals in the carotid body, suggesting roles in chemoreception.
  • TRPC4 and TRPC5 are implicated in central processing within the nucleus of the solitary tract.

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