Ozone-induced lung inflammation and hyperreactivity are mediated via tumor necrosis factor-alpha receptors.

This study was designed to investigate the mechanisms through which tumor necrosis factor (Tnf) modulates ozone (O(3))-induced pulmonary injury in susceptible C57BL/6J (B6) mice. B6 [wild-type (wt)] mice and B6 mice with targeted disruption (knockout) of the genes for the p55 TNF receptor [TNFR1(-/-)], the p75 TNF receptor [TNFR2(-/-)], or both receptors [TNFR1/TNFR2(-/-)] were exposed to 0.3 parts/million O(3) for 48 h (subacute), and lung responses were determined by bronchoalveolar lavage. All TNFR(-/-) mice had significantly less O(3)-induced inflammation and epithelial damage but not lung hyperpermeability than wt mice. Compared with air-exposed control mice, O(3) elicited upregulation of lung TNFR1 and TNFR2 mRNAs in wt mice and downregulated TNFR1 and TNFR2 mRNAs in TNFR2(-/-) and TNFR1(-/-) mice, respectively. Airway hyperreactivity induced by acute O(3) exposure (2 parts/million for 3 h) was diminished in knockout mice compared with that in wt mice, although lung inflammation and permeability remained elevated. Results suggested a critical role for TNFR signaling in subacute O(3)-induced pulmonary epithelial injury and inflammation and in acute O(3)-induced airway hyperreactivity.

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