Effect of azelastine on platelet-activating factor and antigen-induced pleurisy in rats.

Abstract:

:The interference of azelastine with pleurisy induced by antigen was investigated in actively sensitized rats. The antigenic challenge (ovalbumin, 12 micrograms/cavity) caused early plasma leakage, which peaked within 4 h, accompanied by intense neutrophil infiltration. Pleural exudate decayed 24 h after antigen provocation, when a long-lasting increase in the number of resident eosinophils was observed. Oral pretreatment with azelastine (1-10 mg/kg) dose dependently inhibited the vasopermeation (ED50 = 4.2 mg/kg) and reduced the pleural exudate (ED50 = 6.8 mg/kg) induced by the antigen. In contrast, azelastine (10 mg/kg) failed to modify the neutrophil influx observed at 4 h and the eosinophil accumulation detected at 24 h. Azelastine was also effective against rat pleurisy induced by either platelet-activating factor (PAF-acether), histamine or serotonin. It reduced exudation and the increase in the number of mononuclear cells, neutrophils and eosinophils observed 6 h after PAF-acether. Nevertheless, antagonism of PAF-acether may not be relevant to the inhibition observed in the present model of allergic pleurisy, as the inhibition was refractory to three distinct PAF-acether receptor antagonists. In contrast, like azelastine, the histamine H1 receptor antagonist meclizine and the dual histamine and serotonin receptor antagonist cyproheptadine blocked antigen-induced exudation and failed to interfere with cell influx. We conclude that the anti-exudatory activity of oral azelastine on antigen-induced pleurisy is consistent with it exerting direct effects against vasoactive amines, but is not related to an effect against leucocyte infiltration nor to its ability to inhibit PAF-acether.

journal_name

Eur J Pharmacol

authors

Lima MC,Martins MA,Perez SA,Silva PM,Cordeiro RS,Vargaftig BB

doi

10.1016/0014-2999(91)90522-r

subject

Has Abstract

pub_date

1991-05-17 00:00:00

pages

201-7

issue

2-3

eissn

0014-2999

issn

1879-0712

pii

0014-2999(91)90522-R

journal_volume

197

pub_type

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