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Role of transient receptor potential A1 in gastric nociception

Takashi Kondo1, Tadayuki Oshima, Koichi Obata

  • 1Division of Upper Gastroenterology, Hyogo College of Medicine, Hyogo 663-8501, Japan.

Digestion
|July 1, 2010
PubMed

Insights

Transient Receptor Potential Ankyrin 1 (TRPA1) channels in the stomach are crucial for detecting painful stimuli. Blocking TRPA1 reduces pain signals and associated responses, highlighting its role in visceral pain.

Area of Science:

  • Neuroscience
  • Gastroenterology
  • Pain Research

Background:

  • Gastrointestinal afferent fibers transmit pain signals, but the molecular mechanisms of upper GI mechanonociception are poorly understood.
  • Extracellular signal-regulated kinase 1/2 (ERK1/2) activation in primary afferent neurons is linked to acute visceral pain from gastric distention.

Purpose of the Study:

  • To investigate the role of Transient Receptor Potential Ankyrin 1 (TRPA1) channels in upper gastrointestinal mechanonociception.
  • To determine the relationship between TRPA1 activation, ERK1/2 signaling, and visceral pain responses in the stomach.

Main Methods:

  • Examined TRPA1 expression in dorsal root ganglion (DRG) and nodose ganglion (NG) neurons innervating the rat stomach.
  • Investigated co-expression of TRPA1 with ERK1/2, substance P (SP), and calcitonin gene-related peptide (CGRP) in primary afferent neurons.
  • Utilized antisense peptides and a specific TRPA1 blocker to assess the functional role of TRPA1 in gastric distention-induced responses.

Main Results:

  • TRPA1 channels are expressed in gastric primary afferent neurons and co-localized with ERK1/2, SP, and CGRP.
  • Attenuation of TRPA1 activation suppressed both ERK1/2 activation and visceromotor responses to gastric distention.
  • TRPA1 activation appears to trigger the release of SP and CGRP, contributing to neurogenic inflammation and visceral hyperalgesia.

Conclusions:

  • TRPA1 channels are key molecular players in upper gastrointestinal mechanonociception and visceral pain.
  • TRPA1 activation in primary afferent neurons modulates ERK1/2 signaling and neuropeptide release, promoting pain and inflammation.

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