IL18 and colitis: In addition, overexpression of miR‐378a in UmC‐MSC‐EVs suppresses the secretion of IL‐18, IL‐1β and caspase‐1 cleavage target by reducing NLRP3 inflammasome activity, preventing pyroptosis, and thus increasing cell survival in dextran sulphate sodium (DSS)‐induced colitis mice.135