CXCR4 and autoimmune thrombocytopenic purpura: On the one hand, it can be explained that the ability of SDF-1α to promote the proliferation and survival of MSCs is achieved by regulating miRNA-133 expression; on the other hand, it also proves that SDF-1α enhances the expression of miRNA-133 by interacting with CXCR4, thus promoting the differentiation of Bregs in ITP.