TRPA1-mediated responses in trigeminal sensory neurons: Interaction between TRPA1 and TRPV1

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162 Scopus citations


The transient receptor potential (TRP)A1 channel is involved in the transduction of inflammation-induced noxious stimuli from the periphery. Previous studies have characterized the properties of TRPA1 in heterologous expression systems. However, there is little information on the properties of TRPA1-mediated currents in sensory neurons. A capsaicin-sensitive subset of rat and mouse trigeminal ganglion sensory neurons was activated with TRPA1-specific agonists, mustard oil and the cannabinoid WIN55,212. Mustard oil- and WIN55,212-gated currents exhibited marked variability in their kinetics of activation and acute desensitization. TRPA1-mediated responses in neurons also possess a characteristic voltage dependency with profound outward rectification that is influenced by extracellular Ca2+ and the type and concentration of TRPA1-specific agonists. Examination of TRPA1-mediated responses in TRPA1-containing cells indicated that the features of neuronal TRPA1 are not duplicated in cells expressing only TRPA1 and, instead, can be restored only when TRPA1 and TRPV1 channels are coexpressed. In summary, our results suggest that TRPA1-mediated responses in sensory neurons have distinct characteristics that can be accounted for by the coexpression of the TRPV1 and TRPA1 channels.

Original languageEnglish (US)
Pages (from-to)1568-1578
Number of pages11
JournalEuropean Journal of Neuroscience
Issue number8
StatePublished - Apr 2009
Externally publishedYes


  • Interaction
  • Mouse nociceptors
  • Rat trigeminal ganglia
  • TRPA1
  • TRPV1

ASJC Scopus subject areas

  • General Neuroscience


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