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Objective To investigate the effect of adipose mesenchymal stem cells(AMSCs) on the peripheral blood lymphocyte(PBL) in psoriasis vulgaris(PV) patients and the expression and secretion profiles of related inflammatory cytokines in the PBL.Methods AMSCs from three PV patients were co-cultured with PBL. Peripheral blood regulatory cells(Treg) and T helper cell 17(Th17)ratio was measured by flow cytometry. The anti- and pro-inflammatory cytokines expressed and secreted by PBL were detected by quantitative real-time polymerase chain reaction(qRT-PCR) and enzyme-linked immunosorbent assay(ELISA).Results The Treg/total lymphocyte ratio was significantly higher in the healthy people AMSCs+PBL co-culture group[(3.2±0.5)%;P=0.001],but AMSCs in patients had a tendency to promote the proliferation of Treg cells [(1.3±0.2)%],with no significant difference(P=0.485) when compared with the PBL culture alone group[(1.0±0.1)%]. qRT-PCR showed that the ability of PBL in expressing Treg transcription factor forkhead box p3 and