PROBLEM TO BE SOLVED: To provide stem cell and exosome compositions having therapeutic utility to treat a variety of diseases and disorders, e.g., cardiovascular disease, Duchenne muscular dystrophy, and fibrotic disease.SOLUTION: The invention provides an exosome or microvesicle selected from an iPSC cell, an embryonic stem cell, and a stem cell that has been contacted with an effective amount of an isoxazole compound, a derivative or equivalent thereof or Danazol, where the exosome or microvesicle overexpresses one or more of: a specific microRNA (miRNA); and/or one or more proteins selected from among Tsg101, CD9, Hsp70, Flotillin-1 and GAPDH.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】様々な疾患および障害、例えば心血管疾患、デュシェンヌ型筋ジストロフィ-、線維性疾患を治療するために、治療的有用な幹細胞やエキソソ-ム組成物の提供。【解決手段】iPSC細胞、胚性幹細胞、および有効量のイソキサゾ-ル化合物やその誘導体や等価物、ダナゾ-ルと接触させた幹細胞、のうちから選択されたエキソソ-ムと微小胞であって、特定のMicroRNA(miRNA)、および/またはTsg101、CD9、Hsp70、Flotillin-1およびGAPDHから選択した1つ以上のタンパク質を1つ以上過剰発現する、エキソソ-ムまたは微小胞。【選択図】なし