European journal of pharmacology
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The present study characterized a murine model of immune complex-induced pneumonitis and investigated the role of platelet-activating factor (PAF) and eicosanoids as mediators of lung neutrophil infiltration and hemorrhagic lesions. Rabbit antibodies to bovine serum albumin were injected into the airways and bovine serum albumin was injected intravenously into C3H/HePas and BALB/c mice. After 24 h, a significant increase in neutrophil infiltration and hemoglobin concentration in the bronchoalveolar lavage fluid and lung parenchyma was observed in both strains despite the C3H/HePas strain being 10 times more sensitive to PAF. ⋯ Increased levels of leukotriene B4, leukotriene C4/D4, thromboxane B2 were found in bronchoalveolar lavage fluid 4 h after induction of the reaction. There is also a tendency to increased prostaglandins E2 levels. Neutrophil infiltration and vascular lesions in immune complex-induced pneumonitis in mice are mediated by leukotriene B4.