TRPA1 is best known as a sensor for environmental irritants, pain, cold and stretch.

Chemical Name: 
Transient receptor potential cation channel, member A1
IUPHAR entry: 
Wikipedia entry: 
Distribution: 

Brain, heart, small intestine, lung, skeletal muscle, and pancreas.

Literature Discussion: 

Functional Gastro-Intestinal Disorders and pain

TRP receptors (TRPV1-4, TRPA1TRPM8) are classically known for their role in pain sensation but may also be involved in inflammation. TRPs bind to most plant cannabinoids and endocannabinoids with varying affinities (De Petrocellis et al., 2011, 2012), tentatively making TRPs excellent targets and plant cannabinoids excellent substrates for pain and inflammation management.

References

De Petrocellis, L., Ligresti, A., Moriello, A.S., Allarà, M., Bisogno, T., Petrosino, S., Stott, C.G., and Di Marzo, V. (2011). Effects of cannabinoids and cannabinoid-enriched Cannabis extracts on TRP channels and endocannabinoid metabolic enzymes. Br. J. Pharmacol. 163, 1479–1494.

De Petrocellis, L., Orlando, P., Moriello, A.S., Aviello, G., Stott, C., Izzo, A.A., and Di Marzo, V. (2012). cannabinoid actions at TRPV channels: effects on TRPV3 and TRPV4 and their potential relevance to gastrointestinal inflammation. Acta Physiol. Oxf. Engl. 204, 255–266.