HSP90B1 and pulmonary fibrosis: In the present study, we found that miR-148a-3p in hucMSC-EVs was associated with hucMSC-EVs in improving silica-induced pulmonary fibrosis and preliminarily identified that miR-148a-3p exerted an antifibrotic effect via inhibiting the collagen synthesis and secretion of fibroblasts by targeting Hsp90b1.