维生素E对实验性迟发性运动障碍的防治作用及可能机制

目的分析维生素E(vitamin E,Vit E)对迟发性运动障碍(tardive dyskinesia,TD)大鼠模型口周异常不自主运动(vacuous chewing movements,VCM)、血清脑源性营养因子(brain derived neurotrophic factor,BDNF)和总抗氧化能力(total antioxidant capacity,TAC)水平的影响,探索TD可能的防治机制。方法将32只雄性大鼠随机分为TD组[腹腔注射氟哌啶醇(haloperidol,Hal)2 mg/kg+第5周始灌胃5 m L/kg生理盐水(normal saline,NS)]、Vit E预防组(P-Vit E组,腹腔注射Hal 2 mg/kg+灌胃5 m L/kg Vit E溶液)、Vit E治疗组(T-Vit E组,腹腔注射Hal2 mg/kg+第5周始灌胃5 m L/kg Vit E溶液)、对照组(腹腔注射NS 2 m L/kg+第5周始灌胃5 m L/kg NS),每组8只,共观察10周,每周第7天进行VCM评分。第10周末,分别采用酶联免疫吸附法、分光光度法检测大鼠血清BDNF、TAC水平。结果第2周末TD组和T-Vit E组VCM评分较干预前VCM评分增加(P0.05),并在第5周末达峰值;第6周后T-Vit E组VCM评分逐步下降;第10周末T-Vit E组VCM评分(6.5±3.3)与TD组(27.9±5.8)差异有统计学意义(P0.01),与对照组(3.5±1.9)无统计学差异(P0.05)。P-Vit E组与对照组在10个评估点上VCM评分差异均无统计学意义(P0.05)。第10周末,TD组血清BDNF[(6.9±1.0)pg/m L]、TAC[(11.9±3.2)U/m L]水平低于对照组[BDNF(8.6±2.5)pg/m L,TAC(18.2±5.5)U/m L]和T-Vit E组[BDNF(8.7±2.0)pg/m L,TAC(18.6±5.9)U/m L](均P0.01),与P-Vit E组差异无统计学意义(P0.05)。结论Vit E可能通过缓解自由基损伤而对TD模型大鼠VCM症状具有防治作用。

The efficacy of treatment and prevention of vitamin E on haloperidol-induced tardive dyskinesia and its pos-sible mechanisms in rats

Objective To investigate the efficacy of treatment and prevention of VitE on vacuous chewing move-ments (VCMs) of haloperidol-induced tardive dyskinesia (TD) rats and serum levels of brain-derived neurotrophic fac-tor ( BDNF) and total antioxidant capacity ( TAC) , and to explore the possible mechanisms.Methods Thirty-two male Sprague-Dawley (SD) rats were randomly divided into TD, P-Vit E, T-Vit E and control group (n=8), receiving to-week treatment with Haloperidol (Hal)+NS, Hal+Vit E (medicated at the baseline), Hal+VitE (medicated at the fifth week) or normal saline (NS), respectively.VCM was evaluated at each week.ELISA and spectrophotometer were used to detect the serum levels of BDNF and TAC, respectively.Results The VCM score of both TD group and T-Vit E group increased at the 2nd weekend, reached the peak at the 5th weekend.VCM score of T-Vit E group declined gradually at the 6th weekend and was significantly lower than that in the TD group [(6.5 ±3.3) vs.(27.9 ±5.8), P<0.001] but was not significantly different from the control group (3.5 ±1.9) (P>0.05) at the 10th weekend.There was no significant difference in VCM score between P-Vit E group and control group for ten weeks(P>0.05).At the 10th weekend, serum BDNF [(6.9 ±1.0) pg/mL] and TAC [(11.9 ±3.2) U/mL] levels of TD group were significantly lower than those of the controls [BDNF (8.6 ±2.5) pg/mL, TAC (18.2 ±5.5) U/mL] and T-Vit E group [BDNF (8.7 ±2.0) pg/mL, (18.6 ±5.9) U/mL] (P<0.01).However, there was no significant difference in the BDNF and TAC levels between TD and P-Vit E groups (P>0.05).Conclusions Vit E may relieve and prevent VCM in TD model rats though alleviation of free radical damage.