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TRPP2 modulates ryanodine- and inositol-1,4,5-trisphosphate receptors-dependent Ca2+ signals in opposite ways in cerebral arteries. Cell Calcium 2015; 58:467-75. [DOI: 10.1016/j.ceca.2015.07.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 07/17/2015] [Accepted: 07/27/2015] [Indexed: 12/12/2022]
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Li CB, Yang X, Tang WB, Liu CY, Xie DP. Arecoline excites the contraction of distal colonic smooth muscle strips in rats via the M3 receptor – extracellular Ca2+ influx – Ca2+ store release pathway. Can J Physiol Pharmacol 2010; 88:439-47. [PMID: 20555412 DOI: 10.1139/y10-024] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Areca is a Chinese herbal medicine that is widely used for constipation. However the mechanisms of its action are not clear. We investigated the effects of arecoline, the most active component of areca, on the motility of rat distal colonic smooth muscle strips. In longitudinal muscle of distal colon (LMDC) and circular muscle of distal colon (CMDC), arecoline increased the contraction in a dose-dependent manner. Tetrodotoxin (TTX) did not inhibit the effects of arecoline. The contractile response to arecoline was completely antagonized by atropine. 4-Diphenylacetoxy-N-methylpiperidine methiodide (4-DAMP) strongly depressed the response to arecoline, but gallamine and methoctramine did not. Nifedipine, 2-aminoethoxydiphenyl borate (2-APB), and Ca2+-free Krebs solution with EGTA partly inhibited the effects of arecoline. The sum of Ca2+-free Krebs solution, EGTA, and 2-APB completely inhibited the effects of arecoline. The results show that arecoline stimulates distal colonic contraction in rats via the muscarinic (M3) receptor – extracellular Ca2+ influx – Ca2+ store release pathway. It is likely that the action of areca in relieving constipation is due to its stimulation of muscle contraction.
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Affiliation(s)
- Chuan-Bao Li
- Institute of Physiology, School of Medicine, Shandong University, 44 West Wenhua Road, Jinan, Shandong 250012, P. R. China
- Department of Physiology, School of Medicine, Tongji University, 50 Chifeng Road, Shanghai 200092, P. R. China
| | - Xiao Yang
- Institute of Physiology, School of Medicine, Shandong University, 44 West Wenhua Road, Jinan, Shandong 250012, P. R. China
- Department of Physiology, School of Medicine, Tongji University, 50 Chifeng Road, Shanghai 200092, P. R. China
| | - Wen-Bo Tang
- Institute of Physiology, School of Medicine, Shandong University, 44 West Wenhua Road, Jinan, Shandong 250012, P. R. China
- Department of Physiology, School of Medicine, Tongji University, 50 Chifeng Road, Shanghai 200092, P. R. China
| | - Chuan-Yong Liu
- Institute of Physiology, School of Medicine, Shandong University, 44 West Wenhua Road, Jinan, Shandong 250012, P. R. China
- Department of Physiology, School of Medicine, Tongji University, 50 Chifeng Road, Shanghai 200092, P. R. China
| | - Dong-Ping Xie
- Institute of Physiology, School of Medicine, Shandong University, 44 West Wenhua Road, Jinan, Shandong 250012, P. R. China
- Department of Physiology, School of Medicine, Tongji University, 50 Chifeng Road, Shanghai 200092, P. R. China
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