Renal fibrosis is a common pathologic pathway for the progression of chronic kidney disease (CKD) to end-stage renal disease (ESRD). Its mechanisms are unclear and it lacks effective therapy. Thrombospondin 1 (TSP1) mediated transforming growth factor-β1 (TGF-β1) activation was confirmed to promote renal fibrosis. Recently, a disintegrin and metalloprotease with thrombospondin type 1 repeats, member 13 (ADAMTS13), was reported to inhibit Thrombospondin 1 (TSP1) mediated Ca