人参皂甙Rgl对帕金森病小鼠神经保护作用初探

目的 研究人参皂甙Rg1在对帕金森病(PD)黑质多巴胺能神经元凋亡的可能机制及其神经保护作用. 方法 采用神经毒素1-甲基4-苯基-1,2,3,6-四氢吡啶(MPTP)制备PD小鼠模型,免疫组织化学法与蛋白印迹法观察各组小鼠黑质酪氨酸羟化酶(TH)和促凋亡基因Caspase-3表达变化;原位末端标记法(TUNEL)观察黑质细胞凋亡数量变化. 结果 人参皂甙Rg1干预组黑质TH阳性神经元细胞丢失明显减轻(31% vs.55%)(P相似文献   

miR-218-5p改善帕金森病小鼠多巴胺能神经元变性

目的：探索miR-218-5p对1-甲基-4-苯基-1,2,3,6-四氢吡啶（MPTP）诱导的急性帕金森病（PD）模型小鼠黑质多巴胺能神经元的保护作用及其可能机制。方法：18只8周雄性C57小鼠随机分配至MPTP组和PBS组,分别腹腔注射20 mg/kg MPTP或等体积无菌PBS,每隔2 h注射一次,共4次。另将36只8周雄性C57小鼠随机平分为（NC agomir+PBS）组（NCPBS组）、（NC agomir+MPTP）组（NCMPTP组）、（miR-218-5p agomir+PBS）组（218PBS组）、（miR-218-5p agomir+MPTP）组（218MPTP组）,每组9只,分别进行双侧黑质立体定位注射miR-218-5p agomir/NC agomir,3 d后腹腔注射MPTP或PBS。免疫荧光染色和Western blot检测小鼠黑质多巴胺能神经元酪氨酸羟化酶（TH）的表达;荧光定量PCR检测小鼠黑质miR-218-5p和Wnt7a、Ctnnb1、Lef1、Birc5 mRNA的表达。结果：与PBS组相比,MPTP组小鼠黑质miR-218-5p表达显著下降（...     

半胱胺通过抗氧化保护帕金森病模型小鼠多巴胺能神经元机制研究

目的观察半胱胺(CS)通过何种机制保护1-甲基-4-苯基1,2,3,6四氢吡啶(MPTP)所致C57BL小鼠多巴胺能神经元的退变。方法取78只SPF级C57BL小鼠,随机分为6组:对照组,MPTP组,CS 20mg/kg+MPTP组,CS 75mg/kg+MPTP组,MPTP+CS 20mg/kg,MPTP+CS 75mg/kg组。MPTP:20mg/kg 5d,CS 2次/d,皮下注射,共14天。反向高效液相色谱-电化学检测纹状体多巴胺的含量;免疫组织化学检测黑质酪氨酸羟化酶阳性细胞,色谱法检测黑质氧化应激指标。结果 CS(20mg/kg)组抑制C57BL小鼠黑质细胞内的ROS、MDA,促进细胞内谷胱甘肽的合成,保护了多巴胺能神经元;CS(75mg/kg)组对黑质多巴胺浓度及多巴胺能神经元数目无改善作用。结论半胱胺抗氧化保护PD小鼠模型的多巴胺能神经元,保护作用与给药剂量密切相关。     

环氧合酶2表达对帕金森病模型小鼠黑质细胞凋亡的影响

目的:观察环氧合酶2表达对帕金森病模型小鼠中脑黑质细胞凋亡的影响。方法:实验于2005-01/08在华北煤炭医学院解剖学教研室实验室完成。健康雄性C57BL/6N小鼠45只随机分为3组,每组15只。①模型组:皮下注射神经毒素1-甲基-4-苯基-1,2,3,6-四氢吡啶(1-methyl-4-phenyl-1,2,3,6-tetrahydropyri-dine,MPTP)(30mg/kg,盐水溶),1次/d,连续5d。②环氧合酶2抑制剂组:在MPTP注射前3d经口给予环氧合酶2抑制剂Celecoxib(250mg/kg),1次/d,连续3d,随后在每天注射MPTP前3.0h给予1次Celecoxib,连续5d。③对照组:注射与模型组等体积生理盐水。所有动物于最后一次注射后24h处死。通过免疫组织化学和免疫蛋白印记法,观察帕金森病模型小鼠多巴胺能神经元数量和黑质环氧合酶2、半胱氨酸天冬氨酸蛋白酶3和多(ADP-核糖)聚合酶免疫反应阳性细胞数量的变化及腹侧中脑环氧合酶2、凋亡蛋白酶活化因子1和半胱氨酸天冬氨酸蛋白酶3表达水平的变化;观察给予环氧合酶2抑制剂Celecoxib后对上述变化的影响。结果:与对照小鼠相比,模型组小鼠多巴胺能神经元数量下降约63%(P<0.01),黑质环氧合酶2、半胱氨酸天冬氨酸蛋白酶3和多(ADP-核糖)聚合酶免疫反应阳性细胞数量增加(P<0.01),腹侧中脑环氧合酶2、凋亡蛋白酶活化因子1和半胱氨酸天冬氨酸蛋白酶3表达水平大幅升高(P<0.01)。环氧合酶2抑制剂组小鼠黑质多巴胺能神经元数量仅较对照组下降约37%(P<0.01)。与模型组小鼠比较,黑质环氧合酶2、半胱氨酸天冬氨酸蛋白酶3和多(ADP-核糖)聚合酶免疫反应阳性细胞数量减少(P<0.01),腹侧中脑环氧合酶2、凋亡蛋白酶活化因子1和半胱氨酸天冬氨酸蛋白酶3表达水平明显下降(P<0.01)。结论:帕金森病小鼠黑质细胞凋亡可能与环氧合酶2表达有关;环氧合酶2抑制剂Celecoxib对帕金森病小鼠具有神经保护作用。     

脑池内预应用肿瘤坏死因子-α对帕金森病小鼠黑质多巴胺神经元的影响及其机制

目的:研究脑池内预应用肿瘤坏死因子-α(tumornecrosisfactor-alpha,TNF-α)对1-甲基-4-苯基-1,2,3,6-四氢吡啶(1-methy-4-phenyl-1,2,3,6-tetrahydropyridine,MPTP)诱导的帕金森病小鼠黑质多巴胺神经元的影响及可能作用机制。方法:实验于2003-09/2004-03在哈尔滨医科大学动物实验中心及病理实验室进行。以MPTP诱导小鼠帕金森病模型,各干预组脑池内预注入TNF-α(0.1,2.0,100.0ng),24h后皮下注射MPTP40mg/(kg·d),连用5d,并设对照。观察小鼠行为学改变,免疫细胞化学染色法检测黑质区酪氨酸羟化酶(TH)阳性神经元及活化型caspase-3阳性细胞。结果:模型组小鼠黑质TH阳性神经元犤(22.429±7.254)/个犦比对照组犤(64.286±13.487)个犦明显减少(t=6.6764,P<0.001),模型组与对照组相比活化型caspase-3表达上调(P<0.001);各干预组与模型组相比,黑质TH阳性神经元明显减少(P<0.05),而且活化型cas-pase-3阳性细胞表达上调(P<0.05)。结论:脑池内以TNF-α预处理MPTP小鼠,使黑质多巴胺神经元损伤加重,其途径可能与caspase-3引起的细胞凋亡相关。     

烟酰胺对帕金森病小鼠黑质细胞凋亡的影响

目的:探讨黑质细胞凋亡在帕金森病发病机制中的作用及烟酰胺对帕金森病小鼠黑质细胞凋亡和Bax蛋白表达的影响。方法:给C57BL小鼠腹腔注射1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)制备帕金森病小鼠模型。利用原位缺口末端标记法(TUNEL)及Bax免疫组化方法观察黑质细胞凋亡情况及烟酰胺干预的影响。结果:帕金森病小鼠黑质致密带可见大量凋亡细胞犤(19.43±3.33)个/视野犦Bax蛋白表达(Bax阳性细胞平均灰度值80.59±3.73)。预先应用烟酰胺能使凋亡细胞减少犤(6.33±2.35)个/视野犦,烟酰胺 MPTP组与MPTP组间比较差异有显著性意义(q=9.23,P<0.05)。预先应用烟酰胺也能使Bax蛋白表达降低(Bax阳性细胞平均灰度值107.59±2.50),烟酰胺 MPTP组与MPTP组间比较差异有显著性意义(q=7.44,P<0.05)。结论:烟酰胺可降低MPTP诱导的C57BL小鼠黑质细胞Bax蛋白表达,减少黑质细胞凋亡。     

1-甲基-4-苯基-1,2,3,6-四氢吡啶诱导的帕金森病小鼠模型多巴胺能神经元的缺失方式

目的:观察1-甲基-4-苯基-1,2,3,6-四氢吡啶(1-methyl-4-phenyl-1,2,3,6-tetrahydropyritine,MPTP)诱导的帕金森病小鼠急性模型与亚急性模型多巴胺能神经元的缺失方式。方法:实验于2004-11/2005-02在华北煤炭医学院解剖教研室实验室完成。①C57bl小鼠30只,随机分为3组:对照组、急性模型组、亚急性模型组,每组10只。②给予模型组小鼠腹腔注射MPTP,其中亚急性组30mg/(kg·d),连用5d;急性组一天内给药4次,每次20mg/kg,间隔时间一两个小时;对照组给予等量生理盐水。③最后一次注射后24h内取脑,制备石蜡切片。应用原位末端标记法、酪氨酸羟化酶、原癌基因蛋白Bcl-2和细胞色素C蛋白免疫组化染色观察多巴胺能神经元凋亡和改变。结果:30只小鼠均进入结果分析。经免疫组化法发现酪氨酸羟化酶、原癌基因蛋白Bcl-2、细胞色素C蛋白染色阳性细胞数在急性模型组与亚急性模型组之间差别具有显著意义[(22.40±2.06),(68.20±3.61)个/切片;(20.60±2.41),(66.80±2.12)个/切片;(93.0±2.24),(23.2±2.58)个/切片,P<0.001]。④应用原位末端标记法在急性模型组未发现凋亡,而亚急性模型组存在凋亡现象。结论:MPTP诱导的帕金森病小鼠急性模型多巴胺能神经元的缺失可能通过坏死实现,而亚急性模型则是通过凋亡来实现的。     

人参皂苷Rg1介导HSPA8自噬途径改善帕金森小鼠黑质神经元损伤

目的 探讨人参皂苷Rg1对帕金森病(PD)小鼠的神经保护作用及对热休克蛋白A8 (HSPA8)的影响。方法 48只C57BL/6J小鼠随机分为对照组(NC组)、PD组、Rg1-1组(1 mg/kg Rg1)、Rg1-5组(5 mg/kg Rg1)、Rg1-10组(10 mg/kg Rg1)、Rg1-20组(20 mg/kg Rg1)、Rg1-40组(40 mg/kg Rg1)、Rg1-40+VER-155008组(40 mg/kg Rg1+HSPA8抑制剂),每组各6只。除NC组外,其他小鼠腹腔注射1-甲基-4苯基-1,2,3,6-四氢吡啶(MPTP)制备PD模型,随后药物干预10 d,干预同时Rg1-40+VER-155008组小鼠腹腔VER-155008。行为学实验评价小鼠行为运动能力,Nissl染色和Tunel染色检测黑质神经元细胞的尼氏小体数量生成和凋亡情况,免疫组化检测小鼠黑质内α-突触核蛋白(α-Synuclein)、HSPA8表达,免疫荧光测定小鼠黑质内络氨酸氢化酶(TH)、自噬蛋白LC3、p62表达,Westem blot检测小鼠黑质内α-Synuclein、HSPA8...     

3-硝基丙酸预处理阻止黑质多巴胺神经元细胞凋亡

目的:观察3 硝基丙酸(3 NP)预处理时黑质多巴胺(DA)神经元细胞凋亡改变的作用机制及5 羟癸 酸(5 HD)对3 NP效果的影响。方法:25只雄性SD大鼠随机分为5组各5只。右侧黑质内立体定向注射6 羟多 巴胺(6 OHDA)建立帕金森病(PD)模型组,对照组大鼠立体定向和腹腔注射生理盐水,3 NP组在对照组的基础上 腹腔注射3 NP(20mg/kg),预处理组(CPC组)造模前24h给予3 NP(20mg/kg),5 HD组于造模前10min侧脑 室内给予5 HD(5mg/kg)。采用缺口末端标记原位检测法及免疫组化法检测黑质DA神经元细胞凋亡率及酪氨 酸羟化酶(TH)阳性细胞数。结果:PD组、CPC组及5 HD组与对照组和3 NP组比较细胞凋亡率均明显增高,损 毁侧TH阳性细胞数显著降低(P<0.01或P<0.05);CPC组与PD组比较细胞凋亡率降低,TH阳性细胞数增多 (P<0.05);5 HD组与PD组比较则差异无显著性意义(P>0.05)。结论:3 NP预处理可抑制细胞凋亡,而5 HD 可阻断3 NP预处理保护效应。线粒体ATP敏感性钾通道激活参与3 NP预处理神经元保护作用。     

环氧合酶2表达对帕金森病模型小鼠黑质细胞凋亡的影响

目的：观察环氧合酶2表达对帕金森病模型小鼠中脑黑质细胞凋亡的影响。方法：实验于2005—01／08在华北煤炭医学院解剖学教研室实验室完成。健康雄性C57BL／6N小鼠45只随机分为3组，每组15只。①模型组：皮下注射神经毒素1-甲基-4-苯基-1，2，3，6-四氢毗啶（1-methyl-4-phenyl—1，2，3，6-tetrahydropyri-dine，MPTP）（30mg／kg，盐水溶），1次／d，连续5d。②环氧合酶2抑制剂组：在MPTP注射前3d经口给予环氧合酶2抑制剂Celecoxib（250mg／kg），1次／d，连续3d，随后在每天注射MPTP前3．0h给予1次Celecoxib，连续5d。③对照组：注射与模型组等体积生理盐水。所有动物于最后一次注射后24h处死。通过免疫组织化学和免疫蛋白印记法，观察帕金森病模型小鼠多巴胺能神经元数量和黑质环氧合酶2、半胱氨酸天冬氨酸蛋白酶3和多（ADP-核糖）聚合酶免疫反应阳性细胞数量的变化及腹侧中脑环氧合酶2、凋亡蛋白酶活化因子1和半胱氨酸天冬氨酸蛋白酶3表达水平的变化；观察给予环氧合酶2抑制剂Celecoxib后对上述变化的影响。结果：与对照小鼠相比，模型组小鼠多巴胺能神经元数量下降约63％（P〈0．01），黑质环氧合酶2、半胱氨酸天冬氨酸蛋白酶3和多（ADP-核糖）聚合酶免疫反应阳性细胞数量增加（P〈0．01），腹侧中脑环氧合酶2、凋亡蛋白酶活化因子1和半胱氨酸天冬氨酸蛋白酶3表达水平大幅升高（P〈0．01）。环氧合酶2抑制剂组小鼠黑质多巴胺能神经元数量仅较对照组下降约37％（P〈0．01）。与模型组小鼠比较，黑质环氧合酶2、半胱氨酸天冬氨酸蛋白酶3和多（ADP-核糖）聚合酶免疫反应阳性细胞数量减少（P〈0．01），腹侧中脑环氧合酶2、凋亡蛋白酶活化因子1和半胱氨酸天冬氨酸蛋白酶3表达水平明显下降（P〈0．01）。结论：帕金森病小鼠黑质细胞凋亡可能与环氧合酶2表达有关；环氧合酶2抑制剂Celecoxib对帕金森病小鼠具有神经保护作用。     

DJ-1 and Parkin modulate dopamine-dependent behavior and inhibit MPTP-induced nigral dopamine neuron loss in mice.

Parkin-deficient animals exhibit mitochondrial degeneration and increased oxidative stress vulnerability, and both mice and flies lacking DJ-1 are hypersensitive to environmental toxins associated with Parkinson's disease (PD). We used recombinant adeno-associated virus (AAV) gene transfer to study the influence of DJ-1 and Parkin on the dopaminergic system of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-treated mice, a model for sporadic PD. After MPTP lesioning, significantly more dopamine neurons survived in the virus-injected substantia nigra of the AAV-DJ-1 and AAV-Parkin mice when compared with AAV-enhanced green fluorescent protein injected controls. Protection at the neuronal level was supported by increased amphetamine-induced contralateral turning behavior. Normal mice expressing DJ-1 showed apomorphine-induced ipsilateral turning, suggesting a hyporesponsiveness of striatal dopamine D1 receptors in the DJ-1-expressing hemisphere. MPTP drastically reduced dopamine to 19% of normal levels and neither DJ-1 nor Parkin protected against MPTP-induced catecholamine loss under these conditions. Our results show that Parkin and DJ-1 inhibit dopamine neuron death and enhance amphetamine-induced dopaminergic function in a mouse model of idiopathic PD. However, DJ-1 overexpression also reduced postsynaptic dopamine receptor responses in normal mice. These results warrant further exploration of DJ-1 and Parkin gene therapy for PD, although a better understanding of their effects on behavior and dopamine neurotransmission is required before these proteins can be safely used.     

Neuroprotective Effect of Low-Intensity Pulsed Ultrasound on the Mouse MPTP/MPP+ Model of Dopaminergic Neuron Injury

Ultrasound mediated neuromodulation has been demonstrated to a safe treatment strategy in the field of neuroscience. In this study, low-intensity pulsed ultrasound (LIPUS) was used to treat Parkinson's disease (PD) models induced by 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and 1-methyl-4-phenylpyridinium (MPP⁺) to explore the possibility of ultrasound neuroprotective effect on PD. The results demonstrated that LIPUS treatment can attenuate the central neurotoxicity of MPTP in mice, reduce the loss of tyrosine hydroxylase positive neurons in the substantia nigra pars compacta and decrease the apoptosis in the section of substantia nigra. The movement and balance dysfunctions in PD mice were improved with LIPUS treatment. In addition, we demonstrated that LIPUS can inhibit the decreased activity and increased apoptosis of dopaminergic neurons induced by MPP⁺, restrain the accumulation of reactive oxygen species (ROS) and decrease of mitochondrial membrane potential caused by MPP⁺. Moreover, LIPUS stimulation alone did not cause any cytotoxicity and tissue damage in our study. Taken together, the protective and regulatory effects of LIPUS on dopaminergic neurons make it possible as a new, safe and noninvasive treatment for PD.     

表没食子儿茶素没食子酸酯对MPTP致多巴胺能神经元损伤的保护作用

目的研究表没食子儿茶素没食子酸酯(EGCG)对1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)致帕金森病模型小鼠多巴胺能神经元的保护作用。方法32只雄性C57BL/6小鼠随机分为4组：假手术组腹腔注射等量生理盐水,模型组腹腔注射4次MPTP(16 mg/kg,间隔2 h),EGCG治疗组为MPTP+EGCG(5 mg/kg)组,EGCG正常给药组不做任何处理,每日给予5 mg/kg EGCG。连续给药3周后检测行为学指标,黑质酪氨酸羟化酶(TH)免疫组化染色及高效液相色谱-电化学法测定纹状体内多巴胺及其代谢产物浓度。结果模型组5 min内的自发运动次数(71.4±14.0)下降,而EGCG治疗组自发运动次数(87.9±10.7)提高(P<0.05)。与模型组转杆停留时间(73.5±24.9) s相比,EGCG治疗组转杆停留时间(118.6±31.2) s延长(P<0.05)。形态学结果显示,EGCG治疗组黑质TH阳性神经元与模型组相比,数量明显增多。模型组纹状体内多巴胺(DA)及其代谢产物3,4-双羟苯乙酸(DOPAC)和高香草酸(HVA)浓度显著降低,而EGCG治疗组DA、DOPAC和HVA浓度虽有一定程度升高,但无统计学差异。结论EGCG改善MPTP致帕金森病模型小鼠的运动能力下降,对黑质多巴胺神经元有保护作用。     

帕金森病大鼠黑质细胞凋亡与左旋多巴剂量的关系

目的研究左旋多巴对黑质细胞的神经毒性作用,探讨左旋多巴治疗帕金森病(PD)的最佳方案。方法选用Wistar大鼠,采用改良的Thomas方法,用6-OHDA行脑立体定向注射术制作大鼠帕金森病(PD)模型100只,随机分为两大组:PD模型组(n=25)、L-dopa治疗组(n=75),采用TUNEL方法观察左旋多巴小、中、大3种不同剂量犤10,50,100mg/(kg·d)犦、不同的作用时间(1,3,5,7d)对帕金森病大鼠黑质细胞的毒性作用,并观察治疗后7d各项指标的变化。结果同一时点PD大鼠黑质细胞凋亡数随着左旋多巴治疗的时间、剂量增加而增加;1～7d小剂量组:从(412±35)个/mm2减少到(403±22)个/mm2,中剂量组从(468±33)个/mm2增加到(605±37)个/mm2,大剂量组从(759±61)个/mm2减少到(486±37)个/mm2;7～14d各时点减少。结论左旋多巴能加速PD大鼠黑质细胞凋亡,小剂量、间隔使用左旋多巴能有效减少其神经毒性作用。     

正常及帕金森病大鼠黑质细胞凋亡与左旋多巴剂量相关性的实验研究

目的 研究左旋多巴对黑质细胞的神经毒性作用。探讨合理应用左旋多巴治疗帕金森病的方法。方法 通过6-羟基多巴胺脑立体定向注射术制作大鼠帕金森病模型。采用TUNEL方法观察左旋多巴小（每天每公斤10mg)，中（每天每公斤50mg)，大（每天每公斤100mg)三种不同剂量，不同的作用时间（1d,3d,5d,7d)对帕金森病大鼠黑质细胞的毒性作用，并观察治疗后7d各项指标的变化。结果 帕金森病大鼠细胞凋亡数随着左旋多巴治疗的时间，剂量增加而增加。结论 左旋多巴能加速帕金森病大鼠黑质细胞凋亡，小剂量，间隔使用左旋多巴能有效减少其神经毒性作用。     

Delayed delivery of AAV-GDNF prevents nigral neurodegeneration and promotes functional recovery in a rat model of Parkinson's disease

Glial cell line-derived neurotrophic factor (GDNF) is a strong candidate agent in the neuroprotective treatment of Parkinson's disease (PD). We investigated whether adeno-associated viral (AAV) vector-mediated delivery of a GDNF gene in a delayed manner could prevent progressive degeneration of dopaminergic (DA) neurons, while preserving a functional nigrostriatal pathway. Four weeks after a unilateral intrastriatal injection of 6-hydroxydopamine (6-OHDA), rats received injection of AAV vectors expressing GDNF tagged with FLAG peptide (AAV-GDNFflag) or beta-galactosidase (AAV-LacZ) into the lesioned striatum. Immunostaining for FLAG demonstrated retrograde transport of GDNFflag to the substantia nigra (SN). The density of tyrosine hydroxylase (TH)-positive DA fibers in the striatum and the number of TH-positive or cholera toxin subunit B (CTB, neuronal tracer)-labeled neurons in the SN were significantly greater in the AAV-GDNFflag group than in the AAV-LacZ group. Dopamine levels and those of its metabolites in the striatum were remarkably higher in the AAV-GDNFflag group compared with the control group. Consistent with anatomical and biochemical changes, significant behavioral recovery was observed from 4-20 weeks following AAV-GDNFflag injection. These data indicate that a delayed delivery of GDNF gene using AAV vector is efficacious even 4 weeks after the onset of progressive degeneration in a rat model of PD.     

Assessing nigrostriatal dysfunctions by pharmacological MRI in parkinsonian rhesus macaques

New imaging techniques are needed to longitudinally monitor the development, progression and treatment of Parkinson's disease. The present study was designed to test whether the blood oxygenation level-dependent (BOLD) response to dopaminergic stimulation as measured by pharmacological MRI (phMRI) correlated to specific histological and behavioral features of the parkinsonian state. Nine adult rhesus monkeys were rendered hemiparkinsonian by intracarotid administration of MPTP. Three months after MPTP treatment, the trained, MRI-adapted awake animals were scanned with a phMRI technique while being administered a presynaptic (D-amphetamine) or postsynaptic (apomorphine) dopamine stimulating agents. The primary findings were (1) the putamen and substantia nigra (SN) but not the caudate nucleus displayed significant BOLD responses to these dopaminergic drugs; (2) a significant relationship was found between amphetamine-evoked activation and the number of surviving dopamine neurons in the SN, which was also correlated with bradykinesia; and (3) inverse relationships were seen in response to apomorphine and amphetamine stimulation between the MPTP-lesioned and unlesioned putamen and SN. The results suggest that phMRI may prove useful for longitudinally monitoring the progression and treatment of PD.     

尼古丁对帕金森病大鼠纹状体脑胶质细胞源性神经营养因子和多巴胺含量的影响

背景流行病学研究显示,吸烟和帕金森病(Parkinson's disease,PD)存在负相关系,吸烟可能对PD具有保护作用.人们一直在探索尼古丁对PD的保护作用机制.目的研究尼古丁对PD大鼠纹状体脑胶质源性神经营养因子(glialcelltine derived neurotrophic factor,GDNF)和多巴胺含量的影响.设计随机对照研究.地点和对象实验地点华中科技大学同济医学院协和医院,80只大鼠被随机分为预防组50只和治疗组30只.干预本文第一作者将6-羟多巴胺(6-hydroxydopamine,6-OHDA)立体定向注射到大鼠右侧中脑腹侧被盖部和黑质致密部,建立大鼠模型.采用生化,免疫组织化学方法观察不同剂量尼古丁对PD大鼠的作用.主要观察指标检测纹状体GDNF表达及多巴胺含量的变化.结果造模前及造模后皮下注射尼古丁的PD大鼠,纹状体GDNF表达及多巴胺含量较PD组有明显改善(P＜0.05).结论尼古丁可减轻6-OHDA对黑质多巴胺能神经元的损伤,对PD大鼠具有保护作用.