Comparative acute lung inflammation induced by atmospheric PM and size-fractionated tire particles

Toxicology Letters
Paride ManteccaMarina Camatini

Abstract

A comparison of the effects produced by size-fractionated tire particles (TP10 and TP2.5) and similar-sized urban particulate matter (PM10 and PM2.5), collected in Milan in 2007, on the lungs of mice has been performed. The focus is on early acute lung responses following intratracheal instillation of aerosolized particles at a 3-h recovery period. Together with bronchoalveolar lavage (BAL) conventional endpoints like total and differential cell counts, total protein, alkaline phosphatase, lactate dehydrogenase and pro-inflammatory cytokines (TNF-alpha, MIP-2), the expression of different stress protein markers (caspase8, Hsp70, H0-1, NF-kB) was evaluated 3h after particle instillation into Balb/c mice. The TP2.5 fraction reached the alveolar spaces and produced an acute inflammatory response as evidenced by increased LDH and AP activities, total protein and Hsp70 content. TNF-alpha and MIP-2 production was significantly increased and polymorphonuclear neutrophils (PMN) recruitment was apparent. The TP10 fraction distributed mainly in the bronchial district and the only modified BAL parameter was the expression of MIP-2. PM2.5 induced an inflammatory response lesser in magnitude than that produced by PM10 fraction. The TNF-alph...Continue Reading

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