TRPA1 channel activation induces cholecystokinin release via extracellular calcium.
TRPA1 channels are non-selective cation channels activated by plant derived pungent products including allyl isothiocyanate (AITC) from mustard. Therefore, possible intestinal secretory functions of these channels were investigated. We detected TRPA1 mRNA in mouse and human duodenal mucosa and in intestinal mouse neuroendocrine STC-1 cells. Stimulation of STC-1 cells with AITC increased intracellular calcium ([Ca(2+)](i)) and significantly stimulated cholecystokinin secretion by 6.7-fold. AITC induced cholecystokinin release was completely blocked by TRPA1 antagonist ruthenium red and depletion of extracellular calcium and reduced by 36% by nimodipine and nifedipine. This suggests that spices in our daily food might stimulate digestive functions.
Purhonen
A K
AK
Department of Biotechnology and Molecular Medicine, A.I. Virtanen Institute for Molecular Sciences, University of Kuopio, Kuopio, Finland.
Louhivuori
L M
LM
Kiehne
K
K
Kerman
K E O
KE
Herzig
K H
KH
D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002460:Cell Line; D002766:Cholecystokinin / Q000378:metabolism*; D006801:Humans; D008297:Male; D051379:Mice; D020133:Reverse Transcriptase Polymerase Chain Reaction; D000074025:TRPA1 Cation Channel; D050051:Transient Receptor Potential Channels / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*
D000074025:TRPA1 Cation Channel; D050051:Transient Receptor Potential Channels; C475685:Trpa1 protein, mouse; D002766:Cholecystokinin; D002118:Calcium