The effects of substance P and related tachykinins on short-circuit current were determined in submucosa-mucosa sheets of guinea pig distal colon. Substance P, neurokinin A, eledoisin and physalaemin evoked a concentration-dependent increase in short-circuit current with a rank order of potencies of substance P = physalaemin greater than eledoisin = neurokinin A. The substance P response was reduced in chloride-free solutions or after addition of furosemide. Tetrodotoxin, atropine, mecamylamine and pyrilamine reduced the response to substance P. The substance P antagonist, [D-Arg1,D-Phe5,Trp7,9,Leu11]-substance P, reduced the response to neural stimulation and to exogenous substance P. The results suggest that substance P evokes anion secretion by activating cholinergic and noncholinergic neurons and by releasing histamine.
Tachykinin-induced anion secretion in guinea pig distal colon: role of neural and inflammatory mediators.
Published 1990 in Journal of Pharmacology and Experimental Therapeutics
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PUBLICATION RECORD
- Publication year
1990
- Venue
Journal of Pharmacology and Experimental Therapeutics
- Publication date
1990-01-01
- Fields of study
Biology, Medicine, Chemistry
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- Source metadata
Semantic Scholar, PubMed
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