TGFB1 and idiopathic pulmonary fibrosis: This study recommended that miR-155 possibly modulates fibrosis via regulating Ag II type I receptor (AT1), which is amplified in IPF lungs (75), (3) by contrast, miR-200 family members have been found to prevent the epithelial-mesenchymal transition of AECs induced by TGF-β1.