lncDNM3OS promotes pulmonary fibrosis in trans by producing three miRNAs, namely miR‐199a‐5p, miR‐199a‐3p and miR‐214‐3p, which affect the major components Smad and non‐Smad in the TGFβ signal pathway. This evidence concerns the gene TGFB1 and pulmonary fibrosis.