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Title: Substance P mediates atropine-sensitive response of guinea-pig ileum to serotonin. Author: Chahl LA. Journal: Eur J Pharmacol; 1983 Mar 04; 87(4):485-9. PubMed ID: 6189731. Abstract: The action of serotonin (5HT) was investigated on guinea-pig isolated ileum. Low concentrations of 5HT (10(-8) - 2.5 x 10(-7) mol x 1(-1)) produced contractile responses which were abolished by atropine and by methionine enkephalin but not by methysergide. Higher concentrations of 5HT (5 x 10(-7) - 5 x 10(-6) mol x 1(-1)) produced contractions which were inhibited by methysergide. The atropine-sensitive response was also abolished following desensitization of preparations to substance P and by the substance P antagonist [D-Pro2,D-Phe7,D-Trp9]SP. It was concluded that the atropine-sensitive response to 5HT is mediated by substance P.[Abstract] [Full Text] [Related] [New Search]