摘要
目的:研究p38 MAPK信号通路参与6-羟多巴胺(6-OHDA)诱导的帕金森病(PD)模型大鼠痛敏反应的调节机制.方法:将40只雄性Sprague Dawley(SD)大鼠随机分为4组:假手术组(Sham)、模型组(6-OH-DA)、p38 MAPK 抑制剂 SB203580 处理组(6-OHDA+SB203580)、p38 MAPK 激动剂茴香霉素(ANS)处理组(6-OHDA+ANS).采用脑内右侧纹状体立体定向注射6-OHDA的方法建立大鼠PD模型.6-OHDA+SB203580组与6-OHDA+ANS组大鼠注射6-OHDA构建PD模型后分别注射SB203580与ANS进行处理.von Frey纤维丝测痛仪测定大鼠机械缩足阈值(PWT);酶联免疫吸附测定(ELISA)法检测大鼠背根神经节(DRG)中 IL-6、IL-1β、TNF-α 的含量;real time RT-PCR 检测大鼠 DRG 中 IL-6、IL-1β、TNF-α 及 p38 MAPK 的 mRNA 水平.结果:在6-OHDA诱导的PD模型大鼠DRG中,IL-6、IL-1β、TNF-α和p38 MAPK的表达水平显著升高(P＜0.05),大鼠PWT显著下降(P＜0.05);而应用激动剂ANS会更进一步地导致大鼠DRG中IL-6、IL-1β、TNF-α和p38 MAPK的表达水平升高,并使大鼠PWT降低;应用抑制剂SB203580后大鼠DRG中IL-6、IL-1β、TNF-α和p38 MAPK的表达水平均显著降低(P＜0.05),大鼠PWT显著升高(P＜0.05).结论:6-OHDA可诱导大鼠产生机械性痛敏反应,其分子机制与p38 MAPK信号通路激活有关.
Abstract
Objective:To study the regulatory mechanism of p38 MAPK signaling pathway participate in hyperalge-sia reaction in Parkinson's disease(PD)rats model induced by 6-hydroxy dopamine(6-OHDA).Methods:Forty male Sprague Dawley(SD)rats were randomly divided into four groups:Sham group(Sham),model group(6-OHDA),p38 MAPK inhibitor SB203580 treatment group(6-OHDA+SB203580)and p38 MAPK activator anisomycin(ANS)treatment group(6-OHDA+ANS).PD model was established by intra-striatal injection of 6-OHDA stereotactically.6-OHDA+SB203580 and 6-OHDA+ANS groups was injected with 6-OHDA to establish PD model,and treated with inhibitor SB203580 or activator ANS respectively.The von Frey hairs were applied to measure the mechanical paw with-draw threshold(PWT)of rats.Enzyme linked immunosorbent assay(ELISA)was used to detect the content of IL-6,IL-1β,and TNF-α in rat dorsal root ganglion(DRG).The mRNA levels of genes IL-6,IL-1β,TNF-α,and p38 MAPK in rat DRG was detected by real time RT-PCR.Results:In the DRG of 6-OHDA included PD rats,the expres-sion levels of IL-6,IL-1β,TNF-α,and p38 MAPK were significantly increased(P＜0.05),and the PWT of rats were significantly decreased(P＜0.05).The application of activator ANS further increased the expression levels of IL-6,IL-1β,TNF-α,and p38 MAPK,and the PWT of rats were decreased.After application of inhibitor SB203580,the ex-pression levels of IL-6,IL-1β,TNF-α and p38 MAPK were significantly decreased in the DRG of rats(P＜0.05),and the PWT were significantly increased in rats(P＜0.05).Conclusion:6-OHDA induces mechanical hyperalgesia reaction in rats,and the molecular mechanism is related to activation of the p38 MAPK signalling pathway.
基金项目
陕西省重点研发计划农业领域一般项目(2019NY-099)
NETL
NSTL
万方数据