Using IL-10 in a therapeutic context, when bleomycin-induced pulmonary fibrosis model mice were given IL-10 gene delivery treatment through intravenous injection of Ringer’s solution containing IL-10 plasmid, the pathological findings were significantly reduced along with TGF-β1 in bronchoalveolar lavage fluid (BALF) [97]. Here, IL10 is linked to pulmonary fibrosis.