期刊
BIOMEDICAL RESEARCH-TOKYO
卷 30, 期 3, 页码 149-156出版社
BIOMEDICAL RESEARCH PRESS LTD
DOI: 10.2220/biomedres.30.149
关键词
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资金
- Japan Society for the Promotion of Science [18590207]
- Smoking Research Foundation
- Salt Research Foundation
- Food Science Institute Foundation
Short-chain fatty acids (SCFAs), Including acetate, propionate and butyrate, are the most commonly found anions found in the monogastric mammalian large Intestine, and are known to have a variety of physiological and pathophysiological effects oil the gastrointestinal tract. We investigated the protein and mRNA expression levels of GPR41, a possible G protein Coupled receptor for SCFA, using Western blot analysis and reverse transcriptase-polymerase chain reaction. We found that GPR41 protein and mRNA are expressed in human Colonic mucosa. Immunohistochemistry for GPR41 showed that mucosal GPR41 protein is localized in cytoplasm of enterocytes and enteroendocrine cells. Moreover, GPR41-immunoreactive endocrine cells contained peptide YY but not serotonin or GPR43. The cellular population of GPR41 (0.01 +/- 0.01 cells/crypt) was much smaller than that of GPR43 (0.33 +/- 0.01 cells/crypt) in the human colon. However, the potency order of SCFA-induced phasic contraction Of Colonic Smooth muscle that we previously reported is consistent with GPR41 (propionate >= butyrate > acetate) but not GPR43 (proplonate butyrate = acetate). Therefore, the present study suggests that GPR41 expressed in human colonic mucosa may function as a sensor for luminal SCFAs.
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