目的探讨IL.34对RA患者成纤维样滑膜细胞(FLS)前列腺素E2(PGE2)/环氧化酶2(COX-2)表达的影响。方法分离培养6例RA患者FLS,分别用IL-34(50ng/m1)、IL-34受体拮抗剂(25ng/m1)加IL-34(50ng/m1)、信号通路抑制剂(10μmol/L)加IL.34(50ng/m1)刺激。采用反转录(RT)-PCR检测FLSCox2mRNA表达;用ELISA检测细胞培养上清中PGE,水平。2组间比较采用t检验。结果与未刺激组相比,IL-34刺激FLS后COX-2和PGE:水平增高,以48h最为明显[(139±24)pg/ml和(201±8)pg/ml,t=-6.177,P〈0.01];且加入IL-34受体拮抗剂刺激FLS24、48、74h,均可使IL-34刺激的RAFLS分泌PGE2水平降低[(250±58)pg/ml和(100±28)pg/ml,t=5.742,P〈0.01;(375±24)pg/ml和(97±23)pg/ml,t=20.564,P〈0.ol;(357+21)pg/ml和(94±18)pg/ml,拉22.353,P〈0.01];此外,细胞培养体系中加入NF-kB和P38MAPK抑制剂后,IL-34刺激RAFLS产生PGE2水平明显下降[(279±37)pg/ml和(63±17)pg/ml,t=12.806,P〈O.01;(279±37)pg/ml和(77±16)pg/ml,t=6.177,P〈0.0130结论IL-34与其受体结合可能通过NF-KB和P38MAPK信号通路促进RAFLS分泌PGE2,提示其可能参与RA的发病。
Objective To investigate the effects of interleukin-34 (IL-34) on prostaglandin E2 (PGE2)/ cyclo-oxygenase-2 (COX-2) expression on fibroblast-like synoviocytes (FLS) in patients with rheumatoid arthritis (RA). Methods FLS was isolated from 6 RA patients and stimulated with IL-34 (50 ng/ml), IL-34 receptor antagonist (25 ng/ml) and IL-34 (50 ng/ml), inhibitors of signaling pathway (10 μmol/L) and IL-34 (50 ng/ml) in vitro respectively. The expression of COX-2 mRNA was detected by reverse transcription polymerase chain reac-tion (RT-PCR). The level of PGE2 in the supematant of RA FLS culture was measured by Enzyme linked immunosorbent assay (ELISA). Statistical analysis between groups were performed by t test. Results Com- pared to unstimulated FLS, COX -2 and PGE2 expression was increased dramatically on IL-34-stimulated FLS, most evidently in 48 hours [(139±24) pg/ml vs (201±8) pg/ml, t=-6.177, P〈0.01]; Moreover, the level of PGE2 was decreased when anti-IL-34 antibody was added to the IL-34-stimulated RA FLS at 24 hours, 48 hours, 72 hours [(250±58) pg/ml vs (100±28) pg/ml, t=5.742, P〈0.01; (375±24) pg/ml vs (97±23) pg/ml, t=20.564, P〈0.001; (357±21) pg/ml vs (94±18) pg/ml, t=22.353, P〈0.01]; In the presence of SB203580 and IKK-16, PGE2 level produced by IL-34-stimulated FLS was obviously decreased [(279±37) pg/ml vs (63±17) pg/ml, t=12.806, P〈0.01; (279±37) pg/ml vs (77±16) pg/ml, t=6.177, P〈0.01]. Conclusion Binding of IL-34 with itsreceptor may promote the secretion of PGE2 via NF-KB and P38 MAPK signaling pathway in RA FLS, suggesting that it might be involved in the pathogenesis of RA.