Bronchial inflammation and hyperreactivity after anaphylactic shock in guinea pigs actively sensitized by systemic or...

Hyperreactivity and bronchial inflammation resulting from active anaphylactic shock induced by aerosol have been studied in guinea pigs after sensitization by intramuscular injection of large-dose ovalbumin or aerosol ovalbumin. When animals were sensitized by i.m. injection of 30 mg/kg ovalbumin, hyperreactivity to inhalation of histamine was obtained 1-3 h after shock. In bronchoalveolar lavage (BAL) fluid an increase in the number of eosinophils (6-48 h after shock) and neutrophils (6-24 h) was observed. When guinea pigs were sensitized by aerosol route, the hyperreactivity to histamine inhalation appeared 1-6 h after shock. In BAL fluid the number of mononuclear cells dropped (1-3 h) and then increased (24-48 h); the number of neutrophils (6-48 h) and eosinophils (24-48 h) increased. The results observed during these two types of sensitization were compared to those obtained after sensitization by injection of a large dose of ovalbumin mixed with Freund's complete adjuvant.