HMOX1 and pulmonary fibrosis: A previous report has suggested that an HO-1 inhibitor (Zn-deuteroporphyrin-IX-2,4-bisethylene glycol, ZnBG) ameliorates bleomycin-induced pulmonary fibrosis [28], while another study suggested that overexpression of HO-1 by adenoviral vector reduces experimental lung fibrosis [29].