Biological effects of diesel exhaust particles (DEP). II. Acute toxicity of DEP introduced into lung by intratracheal instillation

Toxicology
T IchinoseM Sagai

Abstract

Histopathological examination and cytological analyses in bronchial alveolar lavage fluids (BALF) were performed to clarify the acute toxicity of diesel exhaust particles (DEP) introduced into the lung of ICR mice by intratracheal instillation. Activated charcoal (Norit) was intratracheally administered as a control for non-oedemagenic carbon particles. After administration of two doses (0.4 mg or 0.8 mg per mouse) of DEP, lung water contents increased with instillation dose and with time and increased 1.9 and 2.7-fold, respectively, compared to control animals 24 h after the administration of DEP. In contrast, the instillation of Norit had no effect on the increase in water contents. An inflammatory response in lungs was observed by an increase of inflammatory cells in BALF from mice instilled with DEP. The degree of increase in neutrophils of BALF from mice treated with DEP was much greater than in mice treated with Norit. An intense color of MB-pigment, which showed the extent and degree of endothelial cell injury, was found up to 4 h after administration of DEP. Histopathologically, the disruption of capillary endothelial cells, the detachment from their basement membrane and necrosis, disruption and desquamation of type I ...Continue Reading

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