雷公藤红素在实验性自身免疫性葡萄膜炎(EAU)小鼠眼组织中的抗炎作用及其对小胶质细胞极化的影响OACSTPCD
Anti-inflammatory effect of Celastrol in the ocular tissues of mice with exper-imental autoimmune uveitis and its impact on microglia polarization
目的 探讨雷公藤红素在实验性自身免疫性葡萄膜炎(EAU)小鼠眼组织中的抗炎作用及其对小胶质细胞极化的影响.方法 取健康6~8周龄B10.RⅢ小鼠36只,随机分为正常对照组、EAU溶剂对照组、雷公藤红素干预组,每组12只.将光感受器间维生素A类结合蛋白161-180和完全弗氏佐剂充分乳化混合后,注射于EAU溶剂对照组和雷公藤红素干预组小鼠双侧大腿和尾部皮下,总体积200 μL,每只小鼠注射光感受器间维生素A类结合蛋白161-180的量为50 μg.免疫后第7-14天,雷公藤红素干预组小鼠每天接受0.5 mg·kg-1雷公藤红素腹腔注射治疗,EAU溶剂对照组小鼠注射同等剂量的无菌PBS缓冲溶液.免疫后第14天,通过裂隙灯显微镜观察各组小鼠眼前节表现及行组织切片HE染色,并参照Caspi分级标准对各组小鼠进行临床评分及组织病理学评分;免疫荧光染色观察小鼠眼内小胶质细胞活化情况;Western blot检测小鼠视网膜中诱导型一氧化氮合酶(iNOS)、精氨酸酶-1(Arg1)蛋白表达水平;qRT-PCR检测小鼠视网膜中炎症因子肿瘤坏死因子(TNF)-α、白细胞介素(IL)-1β、IL-6 mRNA相对表达量.采用Graphpad Prism 9.0统计软件进行数据分析.结果 免疫后第14天,通过裂隙灯显微镜观察发现,EAU溶剂对照组小鼠眼前节可见虹膜血管扩张充血明显、角膜水肿、前房渗出;而雷公藤红素干预组小鼠眼前节炎症明显减轻,可见虹膜血管轻度充血.与正常对照组相比,EAU溶剂对照组与雷公藤红素干预组小鼠临床评分均升高,差异均有统计学意义(均为P<0.05).雷公藤红素干预组小鼠临床评分低于EAU溶剂对照组,差异有统计学意义(P<0.05).HE染色结果显示,免疫后第14天,EAU溶剂对照组小鼠出现严重的视网膜皱褶和脱离,炎症细胞弥漫浸润;而雷公藤红素干预组小鼠视网膜结构破坏轻微,可见少量炎症细胞浸润.与正常对照组相比,EAU溶剂对照组与雷公藤红素干预组小鼠组织病理学评分均升高,差异均有统计学意义(均为P<0.05).雷公藤红素干预组小鼠组织病理学评分低于EAU溶剂对照组,差异有统计学意义(P<0.05).正常对照组、EAU溶剂对照组、雷公藤红素干预组小鼠眼内Iba1+细胞密度分别为(1.00±0.12)%、(36.07±4.57)%、(1.83±0.36)%,与正常对照组相比,EAU溶剂对照组及雷公藤红素干预组小鼠眼内Iba1+细胞数增加,差异均有统计学意义(均为P<0.05);与EAU溶剂对照组相比,雷公藤红素干预组小鼠眼内Iba1+细胞数明显减少,差异有统计学意义(P<0.05).与正常对照组相比,EAU溶剂对照组小鼠视网膜中iNOS、Arg1蛋白表达水平均升高,差异均有统计学意义(均为P<0.01);与EAU溶剂对照组相比,雷公藤红素干预组小鼠视网膜中iNOS蛋白表达水平降低,差异有统计学意义(P<0.01).与正常对照组相比,EAU溶剂对照组小鼠视网膜中TNF-α、IL-1β、IL-6 mRNA相对表达量均升高,差异均有统计学意义(均为P<0.05);与EAU溶剂对照组相比,雷公藤红素干预组小鼠视网膜中TNF-α、IL-1β、IL-6 mRNA相对表达量均下降,差异均有统计学意义(均为P<0.05).结论 雷公藤红素可抑制M1型小胶质细胞活化,减少EAU小鼠视网膜炎症因子TNF-α、IL-1β、IL-6的产生,减轻炎症反应.
Objective To investigate the anti-inflammatory action of Celastrol in the ocular tissues of mice with ex-perimental autoimmune uveitis(EAU)and its effect on microglia polarization.Methods A total of 36 healthy B10.RⅢmice at 6-8 weeks of age were selected and randomly divided into the normal control group,EAU solvent control group and Celastrol intervention group,with 12 mice in each group.The interphotoreceptor retinoid-binding protein(IRBP)161-180 and Freund's complete adjuvant were mixed by thorough emulsification and injected subcutaneously into the bilateral thighs and tails of mice in the EAU solvent control group and the Celastrol intervention group with a total volume of 200 μL and 50 μg IRBP 161-180 in each mouse.On 7-14 days after immunization,mice in the Celastrol intervention group received a daily intraperitoneal injection of 0.5 mg·kg-1 Celastrol,and mice in the EAU solvent control group were injected with an equivalent dose of sterile Phosphate Buffered Saline solution.On the 14th day after immunization,the anterior segment of mice in each group was observed by slit-lamp microscope and Hematoxylin and Eosin(HE)staining of tissue sections was performed;the clinical and histopathological scores of mice in each group were obtained by reference to the Caspi grading standards;immunofluorescence staining was used to observe the activation of microglia in the eyes of mice;Western blot was used to detect the protein expression levels of inducible nitric oxide synthase(iNOS)and arginase-1(Argl)in the reti-na;quantitative real-time PCR was used to detect the relative mRNA expression of inflammatory factors in the retina,such as tumor necrosis factor(TNF)-α,interleukin(IL)-1β and IL-6.GraphPad Prism 9.0 was used for data analysis.Results On the 14th day after immunization,it was observed by the slit-lamp microscope that the anterior segment of mice in the EAU solvent control group was markedly congested with dilated iris blood vessels,corneal edema,and anterior chamber exudation;the inflammation in the anterior segment of mice in the Celastrol intervention group was markedly at-tenuated,and the iris blood vessels were seen to be mildly congested.Compared with the normal control group,the clini-cal scores of mice in the EAU solvent control group and the Celastrol intervention group were significantly elevated(both P<0.05);the clinical scores of mice in the Celastrol intervention group were lower than those in the EAU solvent control group(P<0.05).HE staining results showed that on the 14th day after immunization,mice in the EAU solvent control group showed severe retinal folds and detachment with diffuse infiltration of inflammatory cells,while mice in the Celastrol intervention group showed slight structural damage to the retina and a small amount of inflammatory cell infiltration.Com-pared with the normal control group,the histopathological scores of mice in the EAU solvent control group and the Celas-trol intervention group were significantly elevated(both P<0.05);the histopathological scores of mice in the Celastrol in-tervention group were lower than those in the EAU solvent control group(P<0.05).The intraocular Iba1+cell densities of mice in the normal control,EAU solvent control and Celastrol intervention groups were(1.00±0.12)%,(36.07± 4.57)%,and(1.83±0.36)%,respectively.Compared with the normal control group,the number of Iba1+cells in the eyes of mice in the EAU solvent control group and the Celastrol intervention group significantly increased(both P<0.05);compared with the EAU solvent control group,the number of Iba1+cells in the eyes of mice in the Celastrol intervention group was significantly reduced(P<0.05).Compared with the normal control group,the expression levels of iNOS and Arg1 proteins in the retinas of mice in the EAU solvent control group were significantly elevated(both P<0.01);compared with the EAU solvent control group,the expression of iNOS protein in the retinas of mice in the Celastrol intervention group was significantly reduced(P<0.01).Compared with the normal control group,the relative mRNA expressions of TNF-α.IL-1β,and IL-6 in the retinas of mice in the EAU solvent control group was significantly elevated(all P<0.05);compared with the EAU solvent control group,the relative mRNA expressions of TNF-α,IL-1 β,and IL-6 in the retinas of mice in the Celastrol intervention group significantly decreased(all P<0.05).Conclusion Celastrol inhibits Ml microglia activation and reduces the production of retinal inflammatory factors TNF-α,IL-1 β and IL-6 in EAU mice,thereby attenuating the in-flammatory reaction.
庞彬彬;夏沁韵;陈震;邢怡桥
430060 湖北省武汉市,武汉大学人民医院眼科中心
临床医学
雷公藤红素实验性自身免疫性葡萄膜炎小胶质细胞诱导型一氧化氮合酶精氨酸酶-1
Celastrolexperimental autoimmune uveitismicrogliainducible nitric oxide synthasearginase-1
《眼科新进展》 2024 (001)
30-34,38 / 6
湖北省卫生健康委员会面上项目(编号:WJ2021M156)
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