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JWH133对MPP+诱导的原代星形胶质细胞COX-2和iNOS表达的影响

2020-06-08贾翼邓晗马泽刚

青岛大学学报(医学版) 2020年2期

贾翼 邓晗 马泽刚

[摘要] 目的 探讨大麻素Ⅱ型受体(CB2受体)激活对1-甲基-4-苯基-吡啶离子(MPP+)诱导原代星形胶质细胞炎症反应的影响。方法 培养原代星形胶质细胞,生长状态良好时将其分为Control组、MPP+组、JWH133(CB2受体激动剂)+MPP+组、AM630(CB2受体抑制剂)+JWH133+MPP+组。应用免疫印迹法(Western Blot)检测Control组和MPP+组细胞CB2受体蛋白的表达。应用实时荧光定量PCR(RT-PCR)检测各组环氧化酶2(COX-2)和诱导型一氧化氮合酶(iNOS)基因的表达。结果 与Control组相比,MPP+组的CB2受体蛋白表达上升(F=29.78,P<0.01)。与Control组比较,MPP+组COX-2和iNOS基因的表达明显上调(F=22.59、11.27,q=10.13、5.57,P<0.01);JWH133预处理抑制MPP+诱导的COX-2和iNOS基因表达的上调(q=6.26、4.16,P<0.05);此抑制作用可被AM630所阻断(q=5.34、5.67,P<0.01)。结论 激活CB2受体可抑制MPP+诱导的原代星形胶质细胞炎症反应。

[关键词] 受体,大麻酚,CB2;大麻素受体激动剂;1-甲基-4-苯基吡啶;星形细胞;环氧化酶2;一氧化氮合酶Ⅱ型

[中图分类号] R338.2  [文献标志码] A  [文章编号] 2096-5532(2020)02-0156-05

doi:10.11712/jms.2096-5532.2020.56.071 [开放科学(资源服务)标识码(OSID)]

[网络出版] http://kns.cnki.net/kcms/detail/37.1517.R.20200417.0907.003.html;2020-04-18 15:26

[ABSTRACT] Objective To investigate the effect of cannabinoid 2 receptor (CB2 receptor) on 1-methyl-4-phenylpyridinium (MPP+)-induced inflammatory response in primary cultured astrocytes.  Methods Primary cultured astrocytes were cultured and divided into Control group, MPP+ group, JWH133 (CB2 receptor agonist)+MPP+ group, and AM630 (CB2 receptor antagonist)+JWH133+MPP+ group when growing well. Western blotting was used to determine the protein expression of CB2 receptor in Control group and MPP+ group. Quantitative real-time PCR was performed to measure the mRNA expression of cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS).  Results Compared with Control group, the MPP+ group had significantly up-regulated CB2 receptor protein expression (F=29.78,P<0.01) and significantly up-regulated COX-2 and iNOS mRNA expression (F=22.59,11.27;q=10.13,5.57;P<0.01). JWH133 pre-treatment significantly inhibited the up-regulated mRNA expression of COX-2 and iNOS induced by MPP+ (q=6.26,4.16;P<0.01), while this was blocked by CB2 receptor antagonist AM630 (q=5.34,5.67;P<0.01).  Conclusion Activation of CB2 receptor can inhibit MPP+-induced inflammatory response in primary cultured astrocytes.

[KEY WORDS] receptor, cannabinoid, CB2; cannabinoid receptor agonists; 1-methyl-4-phenylpyridinium; astrocytes; cyclooxygenase 2; nitric oxide synthase type Ⅱ

星形膠质细胞是中枢神经系统中数量最多的一类神经胶质细胞,它们在维持细胞外液动力学、调节神经递质代谢、促进神经再生和修复中起重要的作用[1],在帕金森病(PD)的发生发展中也具有重要作用[2]。PD是一种常见的神经变性疾病,其病理特征为黑质致密部多巴胺(DA)能神经元的选择性缺失[3]。神经炎症则是PD神经变性的主要因素之一[4]。在病理情况下,过度活化的星形胶质细胞释放一系列炎性递质,如肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)、环氧化酶2(COX-2)[5]和诱导型一氧化氮合酶(iNOS)等,可以引起神经炎症[6],并激活小胶质细胞继续释放炎性递质加重神经炎症,从而诱导神经元死亡[7-8]。因此,有效抑制星形胶质细胞的活化和炎性因子的释放对于PD的治疗有重要意义。大麻素Ⅱ型受体(CB2受体)是一种G蛋白耦联受体[9],大量研究表明CB2受体在中枢神经系统疾病的发病中起重要作用[10-11]。……

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