肌力康饮对EAMG模型大鼠NMJ超微结构和外周细胞CD4~+细胞浓度的影响
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摘要
目的:建立实验性自身免疫性重症肌无力(expermental autoimmune myasthenia gravis,EAMG)大鼠模型,通过观察肌力康饮对EAMG大鼠的临床症状、神经肌肉接头(Neuromusculai junction NMJ)超微结构和外周CD4~+细胞浓度的变化,探讨肌力康饮治疗重症肌无力的作用机制。
     方法:健康雌性Lewis大鼠60只,随机分为空白组、模型组、阳性药物组、肌力康饮高剂量组、肌力康饮中剂量组、肌力康饮低剂量组,每组10只。除外空白组,其余各组大鼠用AchRα1 129-145肽段的抗原乳液造模。确认造模成功后,肌力康饮高、中、低剂量组分别以40g/(kg·d)、20g/(kg·d)、10g/(kg·d)的生药量灌胃,每日两次。阳性药物对照组给溴化吡啶斯的明4.05g/(kg·d),每日两次灌胃,空白组、模型组给蒸馏水灌胃,给药周期28天。给药结束后,对各组进行临床症状评分,并用电镜观察各组大鼠神经肌肉接头(NMJ)超微结构的变化、取肌肉组织用Motic -BA400显微镜于400倍视野下摄影,每组随机选取6个视野,用Motic image 3.2图像分析软件进行分析,计算其平均灰度值和平均光密度,反应CD4~+细胞浓度的变化。
     结果:1、免疫动物6周后,进行模型制备的各组大鼠临床症状的评分、电镜观察大鼠神经肌肉接头超微结构与空白组比较有显著差异(P<0.01),以此判断造模成功,为研究MG的治疗提供了良好的实验动物模型。
     2、治疗4周后,肌力康饮各组与模型组比较症状评分、促进神经肌肉接头(NMJ)新生轴突的产生,并增加突触小泡的数量,有统计学差异(P<0.05)、外周淋巴细胞CD4~+细胞减少(P<0.05),肌力康饮高剂量组与阳性药物组比较亦有统计学差异(P<0.05)。
     结论:1、本实验用AchR-α1亚单位129-145片段免疫Lewis大鼠,诱导的EAMG大鼠模型在症状表现、神经肌肉接头超微结构方面的表现与人MG相似,初步判断模型成功,为研究肌力康饮的抗MG机制提供了条件。
     2、肌力康饮治疗EAMG大鼠有效。分析其干预机制可能是通过可促进神经肌肉接头新生轴突的产生,并增加突触小泡的数量,外周淋巴细胞CD4~+细胞减少,从而达到治疗MG的作用。
Objective: To establish experimental autoimmune myasthenia gravis (expermental autoimmune myasthenia gravis, EAMG) rat model, by observing the health drink on the strength of clinical symptoms of EAMG rats, neuromuscular junction (Neuromusculai junction) ultrastructural and CD4~+ cells in peripheral blood lymphocytes change explore the strength Kang drink treatment of myasthenia gravis in rats.
     Methods: 60 female Lewis rats were randomly divided into blank group, model group, positive medicine group, muscle strength and Sport drink high-dose group, muscle health drink in the dose group, muscle strength and Sport drink low-dose group, n = 10 only. Except the blank group, the remaining rats with AchRα1 129-145 peptide antigen latex modeling. After the success of recognition model, strength Kang drink high, medium and low-dose group, respectively 40g / (kg ? d), 20g / (kg ? d), 10g / (kg ? d) of the Health and dose gavage treatment, positive medicine the control group to pyridostigmine bromide, 4.05g / (kg ? d), twice a day, blank group, model group was given distilled water, treatment for 28 days.After administration of the clinical symptom score in each group and the rats in each group with the electron microscope neuromuscular junction (NMJ) ultrastructure changes. Muscle tissue obtained with the Motic-BA400 microscope under 400 times magnification in the photography, each group randomly selected six horizons, with the Motic image 3.2 image analysis software for analysis, calculation of the average gray value, the reaction changes in the concentration of CD4 ~+ cells.
     Results: 1.The immune animals 6 weeks after the model prepared by rats in each group of clinical symptoms score, electron microscopy of rat neuromuscular junction ultrastructure compared with the control group were significantly different (P<0.01), in order to determine successful model for the study of the treatment of MG provides a good experimental animal model.
     2.4 weeks after treatment, muscle strength and Sport drink each group compared with model group, symptom score, neuromuscular junction (NMJ) ultrastructure of a statistical difference (P < 0.05), In peripheral blood lymphocytes CD4~+ cells decreased (P<0.05),muscle strength and Sport drink high-dose group and the positive medicine group there are statistical differences (P<0.05).
     Conclusion: 1.This experiment AchR-α1 subunit of 129-145 fragment immune Lewis rats, induced symptoms of EAMG rats in the performance of neuromuscular junction ultrastructure performance of the MG with people similar to the initial model to determine the success of To study the anti-drink muscle health conditions MG mechanism.
     2. Muscle strength and effective health drink treatment of EAMG. Analysis of their mechanisms of intervention might be: through the neuromuscular junction can promote the production of new axons and increase the number of synaptic vesicles and Reduction of CD4~+ cells in peripheral blood lymphocytes to achieve the treatment of MG role.
引文
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