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- W2000228412 abstract "In the present work we have studied the occurrence of different tachykinins (substance P (SP), neurokinin A (NKA) and neuropeptide K (NPK)) in human distal bronchi and pulmonary arteries by means of radioimmunoassay (RIA) and high performance liquid chromatography (HPLC). We have also compared the biological effects of different tachykinins on isolated human bronchi and pulmonary arteries in vitro. The concentration of immunoreactive SP using antiserum SP2 in the pulmonary arteries was higher (1.34 +/- 0.15 pmol/g) than in the bronchi (0.56 +/- 0.05 pmol/g). The contents of other tachykinins than SP measured using antiserum K12 was on the other hand considerably higher in the bronchi (0.33 +/- 0.14 pmol/g) than in pulmonary arteries (0.13 +/- 0.02 pmol/g). Immunoreactive materials corresponding to SP, NKA and NPK were identified in bronchial extracts by RIA combined with HPLC, which also indicated the presence of an eledoisin (ELE)-like component. In vitro studies showed that NKA was the most potent of the tachykinins as a bronchoconstrictor agent, being several hundred-fold more active than SP, acetylcholine and histamine. NPK had an intermediate potency. The bronchoconstrictor effect of NKA was unaffected by atropine, mepyramine and cimetidine. The tachykinins SP and NKA had on the other hand, a rather equal potency in inducing relaxation of serotonin precontracted pulmonary arteries. In conclusion, multiple tachykinins are present in lower airways of man. These peptides exert different biological activities whereby NKA is a very active bronchoconstrictor agent compared to SP while both NKA and SP have rather similar relaxatory activities of vascular smooth muscle." @default.
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- W2000228412 date "1987-04-01" @default.
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- W2000228412 title "Occurrence and effects of multiple tachykinins; Sustance P, neurokinin A and neuropeptide K in human lower airways" @default.
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- W2000228412 doi "https://doi.org/10.1016/0024-3205(87)90130-5" @default.
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