Comparison of lung damage in mice exposed to black carbon particles and ozone-oxidized black carbon particles.

Black carbon (BC) is a key component of atmospheric particles and has a significant effect on human health. Oxidation could change the characteristics of BC and increase its toxicity. The comparison of lung damage in mice exposed to BC and ozone-oxidized BC (oBC) particles is investigated in this study. Mice which were intratracheally instilled with particles have a higher expression of IL-1β, IL-6 and IL-33 in bronchoalveolar lavage fluid (BALF). Also, the IL-6, IL-33 mRNA expression in the lung tissue of mice instilled with oBC was higher than that of mice instilled with BC. The expression of CD3 in the lung tissue of mice intratracheally instilled with oBC was higher than the mice distilled with BC. The pathology results showed that the lung tissue of mice instilled with oBC particles have much more inflammatory cells infiltration than that of mice treated with BC. It is believed that the PI3K-AKT pathway might be involved in the oBC particles caused lung damage. Results indicated that oBC particles in the atmosphere may cause more damage to health. [ABSTRACT FROM AUTHOR]