ABCA1 and idiopathic pulmonary fibrosis: Compared with normoxia, miR-155 expression was increased by hypoxia in both healthy and IPF fibroblasts (Fig E9, C); however, LXRα and ABCA1 expression was increased by hypoxia only in IPF fibroblasts (Fig E9, D), suggesting selective deregulation of LXRα function.