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- W1984556901 abstract "Substance P (SP), a tachykinin with a wide range of biological activities including a priming effect on human eosinophil chemotaxis, was investigated for its influence on eosinophil cytotoxic function measured as degranulation of eosinophil-derived neurotoxin (EDN). Peripheral blood was obtained from healthy volunteers and the degranulation assays were performed using radioimmunoassay (RIA). SP and its C-terminal elicited EDN release in a time-dependent mode at a narrow range of doses with optimal activity of 10−6M. FK888 (NK-1 receptor antagonist) inhibited EDN release stimulated by SP in dose dependency, also a complete inhibition was observed when eosinophils were preincubated with 1000ng/ml pertussis toxin (PTX). Pre-exposure of eosinophils to staurosporine resulted in blockage of SP-induced EDN release in a dose-dependent mode. On the other hand, SP at 10−7M and 10−8M primed eosinophils to suboptimal dose (10−8M) of Platelet activating factor (PAF) resulting into significant enhancement of EDN release. SP(4–11) fragment showed a similar activity while SP(1–4) fragment was not active. SP priming of eosinophils was not affected by Ca2+ depletion, however, it caused a change in the pattern of the intracellular calcium influx against the suboptimal dose of PAF. These results suggest that SP i) may induce human eosinophil matrix protein degranulation through a receptor mediated mechanism coupled to PTX sensitive G protein(s) with the probability of linkage to phospholipase C activation, and, ii) primes human eosinophils for an exalted inflammatory response through a Ca2+ independent pathway." @default.
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- W1984556901 date "1997-01-01" @default.
- W1984556901 modified "2023-10-16" @default.
- W1984556901 title "Mechanisms Involved in Activation of Human Eosinophil Exocytosis by Substance P: An in Vitro Model of Sensory Neuroimmunomodulation" @default.
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- W1984556901 doi "https://doi.org/10.3109/08820139709088545" @default.
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