Abstract
Rat CINC induced a dose- and time-dependent accumulation of neurophils into murine air-pouches, a response which was inhibited by two selective H1-antagonists, mepyramine and triprolidine (∼60%). As pretreatment with fucoidin abolished CINC effect, the relative time-related contribution of selectins on this process was then investigated by using specific monoclonal antibodies (mAb). Anti-CD62L mAb gave a similar degree of inhibition of CINC-induced cell accumulation both at the 2h and 4h time-point (∼75%). Anti-CD62P mAb, but not the anti-CD62E mAb, inhibited PMN accumulation at 2h (65%), but only co-administration of these two mAbs inhibited the cell response to CINC at the 4h time-point (90%). Thus endogenous histamine, CD62L, CD62P, and CD62E, though to a different degree, are required for PMN extravasation observed in response to CINC administration.
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