The overexpression of miR-101 in LL29 IPF fibroblasts inhibited TGF-β-induced protein and mRNA expression of α-SMA and collagens, alpha-1 type I collagen (COL1A1) and alpha-1 type III collagen (COL3A1). The gene discussed is COL3A1; the disease is idiopathic pulmonary fibrosis.