目的：探究白细胞介素（IL）－22对类风湿关节炎（RA）成纤维样滑膜细胞（FLSs）功能的影响及机制。方法：组织块法培养RA－FLSs。将不同浓度（0、1、10、100μg／L）的重组人源性IL－22（rhIL－22）与RA－FLSs共培养24 h、48 h、72 h，CCK－8法检测细胞活力的改变；利用10μg／L的rhIL－22作用于RA－FLSs 24 h，流式细胞术检测细胞周期改变。 rhIL－22和／或信号转导和转录因子3（ STAT3）特异性抑制剂STA－21以不同浓度作用RA－FLSs 24 h，Western blot法检测Bcl－2和p－STAT3蛋白水平的变化。结果：不同浓度的rhIL－22作用于RA－FLSs 24 h、48 h、72 h后，RA－FLSs细胞活力明显增高，均显著高于对照组（P＜0．05）。 rhIL－22刺激RA－FLSs后，S期和G2／M期细胞明显增多，G0／G1期细胞减少。 Western blot法检测结果提示rhIL－22可上调RA－FLSs中Bcl－2、p－STAT3的蛋白水平，而STA－21单用或联用rhIL－22均可抑制RA－FLSs中Bcl－2及p－STAT3的表达（ P＜0．05）。结论：IL－22在RA－FLSs细胞活力和周期调节中起重要作用，且STAT3在IL－22促RA－FLSs细胞Bcl－2表达的过程中起关键作用，提示IL－22可能对RA－FLSs凋亡有一定的影响。%AIM:To determine the effects and mechanisms of interleukin-22 (IL-22) on the fibroblast-like sy-noviocytes ( FLSs) from rheumatoid arthritis ( RA) patients.METHODS:RA-FLSs were cultured by tissue culture meth-od.RA-FLSs were incubated with different concentrations of IL-22 (0,1,10,100μg/L) for 24 h, 48 h and 72 h.The cell viability was examined by CCK-8 assay.IL-22 at concentration of 10 μg/L was used to stimulate RA-FLSs for 24 h, and the change of cell cycle distribution was identified by flow cytometry.The effects of IL-22 at concentrations of 0, 1, 10, 100μg/L and/or STA-21 (a STAT3 inhibitor at concentrations of 0, 25, 50μmol/L) on the protein levels of Bcl-2 and p-STAT3 in the RA-FLSs were determined by Western blot.RESULTS:Compared with control group, stimulation of rhIL-22 at different concentrations for 24 h, 48 h and 72 h, the cells viabilityof RA-FLSs were obviously increased ( P<0.05 ) . After co-cultured with 10 μg/L rhIL-22 for 24 h, the percentages of RA-FLSs were obviously increased in the G2/M+S phase and decreased in the G0/G1 phase.At the same time, rhIL-22 increased, but STA-21 decreased the protein levels of Bcl-2 but p-STAT3 in the RA-FLSs obviously (P<0.05).Treatment with STAT3 inhibitor STA-21 reversed the effect of IL-22-induced Bcl-2 upregulation in the RA-FLSs ( P<0.01 ) .CONCLUSION: STAT3 is critical in the process of IL-22-induced Bcl-2 upregulation in RA-FLSs, indicating that IL-22 may play a role in the apoptosis of RA-FLSs.
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