Abstract
1. When injected into a 6-day-old mouse air-pouch, human recombinant interleukin-8 (IL-8; 0.03-3 micrograms) induced, in a dose-dependent fashion, an accumulation of neutrophils which could be reliably assessed 4 h after the injection. No protein extravasation was measured above the values obtained with the vehicle alone (carboxymethylcellulose, CMC, 0.5% w/v in phosphate-buffered solution, PBS). 2. The IL-8 effect (routinely evaluated at 1 microgram dose) was inhibited neither by local administration of actinomycin D (1 microgram) nor by systemic treatment with indomethacin (1 mg kg-1, i.v.), BWA4C (5 mg kg-1, p.o.), methysergide (6 mg kg-1, i.p.) and RP67580 (2 mg kg-1, i.p.). 3. Treatment of mice with the H1 antagonist, mepyramine (1-10 mg kg-1, i.p.) resulted in a dose-dependent inhibition of the cell accumulation elicited by the chemokine, with a maximal reduction of approximately 50-60%. The mepyramine effect was not due to a non specific reduction of neutrophil function, since treatment with this drug (6 mg kg-1, i.p.) did not modify the cell infiltration measured in response to a challenge with interleukin-1 beta (20 ng) or with the vehicle CMC to any extent. Moreover, treatment of mice with mepyramine did not modify cell counts in a peripheral blood film with respect to controls. Two other H1 antagonists, chemically unrelated to mepyramine, diphenhydramine (9 mg kg-1, i.p.) and triprolidine (0.5 mg kg-1, i.p.), inhibited IL-8-induced migration to a similar extent (approximately 50-60%), whereas the H2 antagonist, ranitidine (5 mg kg-1, i.p.) was without effect.(ABSTRACT TRUNCATED AT 250 WORDS)
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