Female WT mice were unexposed (naïve), exposed to PBS, or oxPAPC via oropharyngeal (o.p.) aspiration and then euthanized 2, 4, or 6 h post- exposure. Lung tissue was collected to assess SR-BI (A) mRNA gene expression by qPCR, and (B) protein via western blot, which was quantified by densitometry and normalized to β-actin. *p<0.05, **p<0.01, ****p<0.0001; n=3-5 per group.