TGFB1 and fibrosis: We simultaneously measured five urinary exosomal MiRNAs, previously associated with fibrosis: miR-21 and miR-200a, which directly regulate multiple collagen isoforms and extracellular matrix components via TGFβ pathway [23]; and miR-410, miR-29c, and miR-150, which have been reported in renal fibrosis in LN [24,25,26].