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青藤碱对兔膝骨关节炎模型软骨Toll样受体2、4及髓样分化因子88表达的影响

2018-11-09郑洁赵莉平胡亚莉

中国中医药信息杂志 2018年9期
关键词:骨关节炎

郑洁 赵莉平 胡亚莉

摘要:目的 观察不同剂量青藤碱对兔膝骨关节炎模型关节软骨中Toll样受体(TLR)2、4和髓样分化因子88(MyD88)表达的影响,探讨其相关作用机制。方法 采用Hulth法建立膝骨关节炎模型。实验兔随机分为空白组、模型组和青藤碱低、中、高剂量组,空白组不予任何处理,模型组和青藤碱低、中、高剂量组膝关节腔分别注射生理盐水和0.2 mL(5 mg)、0.35 mL(8.75 mg)、0.5 mL(12.5 mg)青藤碱,共干预10次。实时荧光定量PCR和Western blot检测关节软骨TLR2、TLR4和MyD88的mRNA和蛋白表达。结果 模型组TLR2、TLR4、MyD88的mRNA和蛋白表达较空白组均显著升高(P<0.01);与模型组比较,青藤碱中、高剂量组TLR2、TLR4、MyD88的mRNA和蛋白表达均显著下调(P<0.05,P<0.01)。结论 青藤碱可通过下调TLR/MyD88通路中关键分子的表达抑制兔膝骨性关节炎软骨免疫反应。

关键词:青藤碱;骨关节炎;固有免疫;Toll样受体;髓样分化因子88;兔

DOI:10.3969/j.issn.1005-5304.2018.09.012

中图分类号:R285.5 文献标识码:A 文章編号:1005-5304(2018)09-0049-03

Abstract: Objective To observe the effects of different doses of sinomenine on toll-like receptor (TLR)2, TLR4 and myeloid differentiation factor 88 (Myd88) in cartilage of rabbit knee osteoarthritis model; To discuss its mechanism of action. Methods Knee osteoarthritis model was established by Hulth method. Experimental rabbits were randomly divided into control group, model group, sinomenine low-, medium- and high-dose groups. Blank group received no processing. Model group, sinomenine low-, medium- and high-dose groups received intra-articular injection of normal saline and sinomenine 0.2 mL (5 mg), 0.35 mL (8.75 mg) and 0.5 mL (12.5 mg) respectively, for 10 times. Real-time fluorescence quantitative PCR and Western blot were used to detect mRNA and protein expressions of TLR2, TLR4 and MyD88 in cartilage. Results mRNA and protein expressions of TLR2, TLR4 and MyD88 in model group significantly increased compared with control group (P<0.01); compared with model group, mRNA and protein expressions of TLR2, TLR4 and MyD88 in sinomenine medium- and high-dose groups decreased significantly (P<0.05, P<0.01). Conclusion Sinomenine can inhibit the cartilage immune response of rabbit knee osteoarthritis by down-regulating expressions of key molecules in the TLR/MyD88 pathway.

Keywords: sinomenine; osteoarthritis; innate immune; toll-like receptor; myeloid differentiation factor 88; rabbits

骨性关节炎(osteoarthritis,OA)是由增龄及生物力学机制改变等因素引起的以关节软骨损伤为中心,并累及病变关节周围多种组织的退行性关节病。近年研究发现,包括炎性反应及固有免疫反应在内的生物学因素在OA发病中发挥了重要作用,OA滑膜炎性反应很可能是软骨损伤激活机体固有免疫反应后出现的继发过程,与OA的发生与进展紧密联系在一起[1]。青藤碱是从防己科藤本植物青风藤中提取的生物碱单体,为青风藤的主要活性成分,具有镇痛、消炎及免疫抑制等作用。课题组前期研究发现,青藤碱可抑制OA滑膜炎性反应,对关节软骨具有保护作用[2]。本实验以“固有免疫参与OA”为切入点,观察不同剂量青藤碱对兔膝OA模型关节软骨中Toll样受体(Toll-like receptors,TLR)2、4和髓样分化因子88(myeloid differentiation factor 88,MyD88)等TLR/MyD88通路中关键分子表达的影响,从免疫学角度探讨青藤碱干预OA的相关机制。……

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