不同剂量天麻素对甲基苯丙胺依赖大鼠条件位置偏爱及海马小胶质细胞激活的影响

Effects of Different Doses of Gastrodin on Conditioned Place Preference and Microglia Activation in Hippocampus of Methamphetamine Dependent Rats

目的研究不同剂量天麻素(gastrodin,Gas)对甲基苯丙胺(methamphetamine,Meth)依赖大鼠条件性位置偏爱(conditioned place preference,CPP)的影响及海马小胶质细胞激活状态的改变。方法腹腔注射Meth(10 mg/kg,qd,14 d)建立Meth依赖大鼠CPP模型,然后采用10 mg/kg、30 mg/kg、100 mg/kg不同剂量的天麻素治疗14 d,测定不同剂量天麻素对Meth依赖大鼠CPP效应的影响;用免疫荧光技术检测不同剂量天麻素对海马小胶质细胞激活的影响。结果Meth依赖大鼠CPP模型建立成功。与生理盐水组相比,Meth组的CPP效应明显增强,差异有统计学意义(P<0.05);天麻素治疗可使大鼠在伴药箱停留时间明显缩短;与Meth组相比,10 mg/kg、30 mg/kg、100 mg/kg的天麻素治疗后,可呈剂量依赖性地降低Meth诱导的CPP效应,且100 mg/kg的天麻素可基本消除Meth诱导的CPP效应。免疫荧光检测结果显示,与生理盐水组相比,Meth组大鼠海马小胶质细胞明显被激活;经10 mg/kg、30 mg/kg、100 mg/kg的天麻素治疗后,小胶质细胞激活被明显抑制,且30 mg/kg、100 mg/kg两组剂量的天麻素治疗后抑制效果更明显。结论天麻素可呈剂量依赖性降低Meth依赖大鼠的CPP效应,天麻素对Meth成瘾具有改善作用。不同剂量的天麻素可抑制Meth依赖CPP大鼠海马组织小胶质细胞的激活状态。

Objective To study the effects of different dosages of gastrodin on conditioned place preference and hippocampal microglia activation in methamphetamine(Meth)-dependent rats.Methods Meth dependent CPP model was established by intraperitoneal injection of meth(10 mg/kg,QD,14 d)and then gastrodin(10 mg/kg,30 mg/kg,100 mg/kg)was used for 14 d to determine the effect of gastrodin on CPP in meth dependent rats.After that,the immunofluorescence technique was used to detect the effect of different doses of gastrodin on the activation of microglia in hippocampus.Results The Meth-dependent rat CPP model was successfully established.Gastrodin treatment could shorten the time of the rats stayed in the drug-paired chamber.Compared with the saline group,the CPP effect of the Meth group was significantly enhanced,and the difference was statistically significant(P<0.05).Compared with Meth group,10 mg/kg,30 mg/kg,and 100 mg/kg gastrodin treated groups showed a dosedependent reduction of Meth-induced CPP effect,and 100 mg/kg of gastrodin could basically eliminate the CPP effect induced by Meth.The results of immunofluorescence showed that,compared with the normal saline group,the hippocampal microglia of the Meth group was significantly activated.After the treatment with 10 mg/kg,30 mg/kg,or 100 mg/kg gastrodin,the microglia cell activation was inhibited by gastrodin,and the performance was more obvious after the treatment with 30 mg/kg and 100 mg/kg gastrodin.Conclusion Gastrodin can reduce the CPP effect of Meth-dependent rat in a dose-dependent manner;gastrodin has a potential effect on methamphetamine dependence.Gastrodin can inhibit the activation of hippocampal microglia in hippocampus region of Meth-dependent rat.