目的探讨罗格列酮对类风湿关节炎患者滑膜成纤维细胞(RA—FLS)核因子-κB受体激活配体(RANKL)和骨保护素表达的影响及信号传导通路。方法原代培养RA—FLS,不同浓度罗格列酮(0、5、10、15、20μmol/L)干预3d,检测罗格列酮对RA—FLS增殖及RANKL、骨保护素mRNA和蛋白表达的影响,并检测0、15、20μmol/L罗格列酮对RA—FLSp-ERK.p-p38、p-JNK蛋白表达的影响。多组间比较采用单因素方差分析,两两比较采用Bonferroni法。结果5、10、15、20μmol/l罗格列酮干预可抑制RANKLmRNA(0.503±0.005、0.438±0.031、0.161±0.042、0.050±0.018)和蛋白(1.72±0.09、1.58±0.05、1.46±0.11、1.22±0.14)表达(F=200.820,肚13.602,均P〈0.01),上调骨保护素mRNA(2.8±0.5、7.0±3.2、8.4±2.3、25.7±5.1)和蛋白(1.21±0.11、1.52±0.16、1.63±0.11、1.91±0.03)表达(F=26.531,F=24.872,均P〈0.01),RANKL/骨保护素mRNA和蛋白比率降低(F=453.425,P〈0.01;F=4.173,P〈0.05),且呈剂量依赖性;15、20μmol/L罗格列酮明显抑制p-ERK蛋白表达(0.55±0.06、0.45±0.06,F=6.991,P〈0.05)。结论罗格列酮可能通过p-ERK信号途径抑制RA—FLS表达RANKL并上调骨保护素的表达。
Objective To investigate the effect of rosiglitazone (RSG), a high-affinity synthetic ago- nist for PPAR-γ, on the expression of receptor activator of NF-KB ligand (RANKL) and osteoprotegerin (OPG) in rheumatoid arthritis fibroblast-like synoviocyte (RA-FLS) and the underlying mechanisms. Methods RA- FLS were incubated with different concentrations of RSG (0, 5, 10, 15, and 20 μmol/L) for 3 days, RA- FLS proliferation was detected by Cell Counting Kit-8 assay, and then the expression of RANKL and OPG was examined by real-time PCR and Western blot. The expression of phosphorylated ERK, p38 and JNK was also detected after RA-FLS was incubated with RSG (0, 15, and 20 μmol/L) for 3 days. One-way ANOVA and Bonferroni were used for statistical analysis. Results RSG (5, 10, 15, and 20 μmol/L) had significantly inhibited the expression of RANKL mRNA (0.503±0.005, 0.438±0.031, 0.151±0.042, 0.050±0.018) and protein (1.72±0.09, 1.58±0.05, 1.46±0.11, 1.22±0.14)in RA-FLS (F=200.820, F=13.602, P〈0.01), while the expression of OPG mRNA (2.8±0.5, 7.0±3.2, 8.4±2.3, 25.7±5.1) and protein (1.21±0.11, 1.52± 0.16, 1.63±0.11, 1.91 ±0.03) increased significantly (F=26.531, F=24.872, P〈0.01), both in a dose dependent manner. The ratio of RANKL/OPG mRNA and protein significantly reduced (F=453.425, P〈0.01 ; F=4.173, P〈0.05). RSG ( 15, 20 μmol/L) significantly inhibited the expression of p-ERK-1/2 protein (0.55_± 0.06, 0.45_±0.06, F=6.991, P〈0.05). Conclusion RSG can inhibit RANKL expression in RA-FLS through p-ERK pathway.