颞叶癫(癎)大鼠模型内嗅皮质和齿状回内Sema3A及其受体Np1的表达变化

目的 探讨颞叶癫(癎)大鼠脑内Sema3A及其受体Np1的表达变化在癫(癎)发病中的作用.方法 SD大鼠制成颞叶癫(癎)模型,Neo-Timm染色证实苔藓纤维出芽,免疫组化和原位杂交技术对致(癎)后不同时间点内嗅皮质和齿状回的Sema3A mRNA、Np1 mRNA和蛋白表达进行分析.结果 与对照组比较,颞叶癫(癎)大鼠海马齿状回内分子层存在苔藓纤维出芽(7 d:0.70±0.42,15 d:1.50±0.52,30 d:2.20±0.41,60 d:2.50±0.51,P＜0.05);在匹罗卡品致(癎)后7 d,实验组内嗅皮质区Sema3A mRNA的表达(0.3006±0.0675)明显低于对照组(0.4562±0.0457,P＜0.01);齿状回内Np1mRNA(0.2337±0.0358)及蛋白(0.2706±0.0389)的表达亦明显低于对照组(P＜0.01).结论 内嗅皮质区Sema3A mRNA、齿状回内Np1 mRNA和蛋白的表达下调,可能参与了苔藓纤维的出芽机制.     

低级别胶质瘤合并癫(癎)患者腺苷A2A受体信号通路变化的研究

目的 研究低级别胶质瘤合并癫(癎)患者腺苷A2A受体(A2AR)信号通路的变化.方法 收集10例低级别胶质瘤合并癫(癎)患者(胶质瘤合并癫(癎)组)脑肿瘤标本,另选择6例局灶性皮质发育不良ⅡB型患者(局灶性皮质发育不良组)手术切除的癫(癎)病灶周边组织为对照.利用免疫组化法检测标本中CD39、CD73、A2AR、谷氨酸...     

腺苷A2A受体拮抗剂改善帕金森病运动并发症

目的 探讨腺苷A2A受体拮抗剂8-(3-Chlorostyryl)caffeine(CSC)对左旋多巴诱发的运动并发症的行为学与细胞学影响.方法 通过6-羟基多巴(6-OHDA)立体定向注射至大鼠前脑内侧束建立帕金森病(PD)动物模型.模型成功大鼠接受每日2次左旋多巴甲酯(50 mg/kg加12.5mg/kg苄丝肼)腹腔注射,持续22 d.在第23天,运动并发症模型组大鼠(n=8)继续接受如上用药,用药组(n=8)在左旋多巴注射前注射腺苷A2A受体拮抗剂CSC,均用药至第29天.同时设假手术组(n=8)和PD对照组(n=8).评估旋转时间,并采用免疫组织化学法和蛋白印迹法观察和检测纹状体区腺苷A2A受体的表达情况.结果 左旋多巴长期用药诱发PD大鼠模型旋转反应时间缩短,同时模型组损伤侧纹状体区腺苷A2A受体的表达升高[阳性细胞指数(IOD),(11.55±2.75)×104>],较假手术组[IOD,(6.02±1.29)×10±]和PD组[IOD,(5.60±1.83)×10±]有统计学意义(F=33.31,P<0.05).CSC用药逆转了左旋多巴诱导的PD大鼠旋转时间的缩短,损伤侧纹状体区腺苷A2A受体的表达[IOD,(5.80±1.56)×104>]也下调至对照组和PD组水平.结论 腺苷A2A受体参与了左旋多巴诱发的运动并发症的发生,腺苷A2A受体拮抗剂可能是治疗PD运动并发症有前景的药物.     

γ-氨基丁酸B受体亚单位在人类难治性颞叶癫癎患者中的表达

目的探讨γ-氨基丁酸B受体亚单位(GABAB1R)在人类难治性颞叶癫癎病理机制中的作用.方法采集难治性颞叶癫癎患者手术切除海马标本,利用逆转录-聚合酶链反应(RT-PCR)和蛋白免疫印迹分析(Western-blot)方法检测患者GABAB1R的mRNA和蛋白表达水平,并与非癫癎者进行对照.结果与对照组标本相比,难治性癫癎患者手术标本中GABAB1R mRNA(0.366±0.023)和蛋白(145.56±3.55)的表达均有上调(P＜0.05).结论GABAB1R可能参与了人类难治性癫癎的病理生理机制.     

小鼠匹鲁卡品致痫后海马活化素A、抑制素A蛋白及活化素ⅡA受体mRNA的差异表达

目的观察癫癎持续状态(SE)后小鼠海马活化素A、抑制素A蛋白及活化素ⅡA受体mRNA表达的变化.方法采用匹鲁卡品诱导的SE小鼠模型,分别应用Western blot与RT-PCR观察SE后活化素A与抑制素A蛋白及活化素ⅡA受体mRNA表达的动态变化.结果①活化素A蛋白于SE后3 h开始增高,6 h显著增高,24 h至高峰,48 h仍维持在较高水平;而未成SE的小鼠活化素A表达无明显变化.②抑制素A蛋白SE后无明显增加,同正常小鼠及未成SE的小鼠比较无显著差异.③活化素ⅡA受体mRNA在SE后表达无明显变化.结论SE后海马活化素A、抑制素A蛋白及活化素ⅡA受体mRNA表达存在差异性;活化素A可能对癎性脑损伤的保护与修复具有重要作用.     

Orexin受体拮抗剂对睡眠剥夺的戊四氮致(癎)大鼠癫(癎)发作及脑组织病理学变化的影响

目的 探讨orexin-1受体(OX1R)和orexin-2受体(OX2R)拮抗剂对睡眠剥夺(SD)的戊四氮(PTZ)致(癎)大鼠癫(癎)发作及脑组织病理学变化的影响.方法 雄性Wistar大鼠48只,随机分为正常对照(NC)组、PTZ组、SD+ PTZ( SD)组、SD+ PTZ+二甲基亚砜(DMSO)组、SD+ PTZ+ OX1R拮抗剂SB334867(SB)组和SD+ PTZ+ OX2R拮抗剂TCS OX229 (TCS)组.采用改良多平台SD法,SD前及SD 48 h分别给予相应组大鼠侧脑室注射DMSO、SB或TCS.SD 72 h给予各组腹腔注射PTZ 50 mg/kg诱导癫(癎)发作;观察各组大鼠癫(癎)发作的潜伏期、发作等级评分、发作持续时间及死亡率;应用常规染色法观察海马的病理学变化,免疫荧光法(BrdU标记)观察神经细胞增殖的变化.结果 (1)与PTZ组比较,SD组及DMSO组(癎)性发作的潜伏期明显缩短,发作等级评分、持续时间及死亡率明显增加(均P ＜0.001),海马CA3区神经元损害加重,海马齿状回门区和颗粒细胞下层BrdU阳性细胞数显著增多(P＜0.001);SD组与DMSO组间差异无统计学意义.(2)与SD组比较,SB组和TCS组大鼠(癎)性发作的潜伏期明显延长,发作等级评分、持续时间及死亡率明显下降(均P＜0.05),海马CA3区神经元损害明显减轻,齿状回门区和颗粒下层BrdU阳性细胞数减少(均P ＜0.05);TCS组的变化较SB组更显著(P＜0.05 ～0.01).结论 Orexin受体拮抗剂尤其是OX2R拮抗剂可通过减轻海马CA3区神经元的损害和抑制齿状回区细胞增殖减轻SD对PTZ诱导癫(癎)发作的不利影响.     

腺苷A3受体在中枢神经系统损伤中的作用

腺苷是腺嘌呤核苷酸的前体和代谢产物,是中枢神经系统重要的神经调质,通过不同的腺苷受体（adenosine receptor,AR）而发挥多种生物学效应。已知的腺苷受体包括A1R,、A2A、R、A2BR及A3R四种。     

氯化锂-毛果芸香碱点燃癫痈大鼠模型中腺苷激酶表达的动态改变

目的：观察氯化锂-毛果芸香碱慢性点燃大鼠在点燃过程中脑内腺苷激酶（ADK）表达的动态演变情况,探讨癫痫发作与ADK的关系及时间演变特征,以评价ADK在癫痂发病机制中的作用。方法：氯化锂-毛果芸香碱点燃大鼠模型,分模型组、对照组和正常组。采用RT-PCR及Western blot的方法监测发作后24h和1、6个月时大鼠脑内ADK表达的动态改变情况。结果：氯化锂-毛果芸香碱点燃后24h时,RT—PCR及Western blot检测ADK的表达均低于正常对照组,差异有统计学意义（P〈0．05或P〈0．01）;在点燃进入慢性期后的1和6个月时则相反,ADK表达较点燃前明显增高,差异有显著统计学意义（P〈0．01）。ADK表达6个月时较1个月时更高（P〈0．05或P〈0．01）,即慢性期ADK的表达增高随时间延长越加明显。结论：ADK在点燃过程中呈现双向改变特征,急性期表达降低,促进细胞外腺苷浓度的增高;进入慢性期,反复的癫痫发作导致了ADK的过表达,这可能是导致癫痂反复发作而无法控制的重要因素。     

戊四氮点燃癫癎大鼠空间学习记忆改变及海马NR2B表达

目的观察戊四氮点燃癫癎大鼠空间学习记忆功能变化及海马NMDA2型受体(NR2)B亚单位(NR2B)表达,探讨二者的关系及PTZ致癎大鼠认知障碍发生的分子机制。方法采用戊四氮(PTZ)慢性癫癎(CE)模型,Y-迷宫对两组大鼠进行行为学检测,免疫组织化学方法观察两组大鼠海马CA3区NR2B表达的变化,反转录多聚酶链反应(RT-PCR)方法检测大鼠海马NR2B mRNA的表达。结果癫癎组大鼠空间学习记忆能力受损;其海马CA3区NR2B阳性细胞较对照组明显减少(P<0.01),同时伴有海马NR2B mRNA表达下降(P<0.01)。结论戊四氮点燃癫癎大鼠空间学习记忆受损可能与海马神经元NR2B的表达减少有关。     

匹罗卡品癫癎幼鼠模型B1与B2激肽受体表达研究

目的 检测B1及B2激肽受体在匹罗卡品癫(癎)幼鼠模型中表达的变化并探讨其作用机制.方法 健康、雄性幼年(3周)SD大鼠35只,随机分为空白对照组5只;癫(癎)模型组15只,采用匹罗卡品法制作癫(癎)模型,分为急性期组、静止期组、慢性期组3亚组,每亚组5只;生理盐水对照组(盐水组)15只,与匹罗卡品实验组大鼠相同时间点给予腹腔注射盐水,分为与实验癫(癎)组各时间点相对应的盐水6h组、盐水5d组、盐水60d组3个亚组,每亚组5只.各组于相应时间点处死动物取海马标本,应用逆转录聚合酶链反应(RT-PCR)方法 检测脑组织海马区的B1及B2激肽受体的表达变化,并相互比较.结果 与盐水6h组、盐水5d组比较,急性期组、静止期组的B1激肽受体mRNA表达显著上调,差异具有统计学意义(P<0.05),慢性期与生理盐水60d组间比较差异无统计学意义(P>0.05);与盐水60d组比较,在实验癫(癎)模型各亚组B2激肽受体mRNA表达均显著上调,差异具有统计学意义(P<0.05);盐水各亚组与空白对照组相比,B1、B2激肽受体mRNA表达差异无统计学意义(P>0.05).结论 B1与B2激肽受体mRNA表达失衡在癫(癎)的发生、发展过程中起重要作用.     

Differential gene expression of adenosine A1, A2a, A2b, and A3 receptors in the human enteric nervous system

Adenosine receptors (ADORs) in the enteric nervous system may be of importance in the control of motor and secretomotor functions. Gene expression and distribution of neural adenosine A1, A2a, A2b, or A3 receptors (Rs) in the human intestine was investigated using immunochemical, Western blotting, RT-PCR, and short-circuit current (I(sc)) studies. Adenosine A1R, A2aR, A2bR, or A3R mRNAs were differentially expressed in neural and nonneural layers of the jejunum, ileum, colon, and cecum and in HT-29, T-84, T98G, and Bon cell lines. A1R, A2aR, A2bR, and A3R immunoreactivities (IRs) were differentially expressed in PGP 9.5-immunoreactive neurons. A2bR IR occurs exclusively in 50% of submucosal vasoactive intestinal peptide (VIP) neurons (interneurons, secretomotor or motor neurons) in jejunum, but not colon; A2aR is also found in other neurons. A3R IR occurs in 57% of substance P-positive jejunal submucosal neurons (putative intrinsic primary afferent neurons) and less than 10% of VIP neurons. Western blots revealed bands for A3R at 44 kDa, 52 kDa, and 66 kDa. A2aR and A2bR are coexpressed in enteric neurons and epithelial cells. 5'-N-methylcarboxamidoadenosine or carbachol evoked an increase in I(sc). A2bR IR is more prominent than A2aR IR in myenteric neurons, nerve fibers, or glia. A1R is expressed in jejunal myenteric neurons and colonic submucosal neurons. Regional differences also exist in smooth muscle expression of ADOR IR(s). It is concluded that neural and nonneural A1, A2a, A2b, and A3Rs may participate in the regulation of neural reflexes in the human gut. Clear cell and regional differences exist in ADOR gene expression, distribution, localization, and coexpression.     

腺苷A2A受体拮抗剂对左旋多巴诱发异动症大鼠行为、纹状体A2A受体和代谢型谷氨酸受体5亚型蛋白表达的影响

目的 评价腺苷A2A受体拮抗剂(CSC)对左旋多巴(L-DOPA)诱发异动症大鼠行为、纹状体A2A受体和代谢型谷氨酸受体5亚型(mGluR5)蛋白表达的影响.方法 6-羟多巴胺(6-OHDA)立体定向损毁大鼠右内侧前脑束,建立单侧损毁帕金森病(PD)大鼠模型.采用随机数字表法将40只成功PD大鼠随机分为4组(每组10只):生理盐水组;L-DOPA 25 mg/kg+苄丝肼6.25 mg/kg组;CSC 2.5 mg/kg组;L-DOPA 25 mg/kg+苄丝肼6.25 mg/kg联合CSC 2.5 mg/kg组.给予大鼠每日2次腹腔注射,持续21 d.在治疗第2、9、11、18、21天观察大鼠行为学变化,Western blot检测纹状体区腺苷A2A受体和mGluR5的蛋白表达水平.结果 L-DOPA联合CSC组PD大鼠损毁对侧前肢跨步数显著增加,与治疗前比较差异有统计学意义,与L-DOPA组相比,前肢功能改善程度不随时间延长而减弱.单独CSC组治疗后对侧前肢跨步数明显增加,与治疗前比较差异有统计学意义,有疗效逐渐增加至稳定趋势.L-DOPA联合CSC组[(11±5)分]部分口颌及肢体异常不自主运动评分较L-DOPA组[(17±4)分]显著减少,差异有统计学意义(t=2.44,P＜0.05).L-DOPA联合CSC治疗逆转了L-DOPA诱导的对侧旋转反应时间缩短和腺苷A2A受体、mGluR5蛋白表达的上调,差异均有统计学意义.结论 腺苷A2A受体与mGluR5均参与了L-DOPA诱发的异动症的发生发展,A2A受体拮抗剂能够改善PD运动症状,增强L-DOPA的抗PD效应且部分减轻异常不自主运动,对L-DOPA诱发的异动症的治疗有着较好的应用前景.

Abstract：

Objective To study the behavioural changes and biological effects of selective adenosine A2A receptor antagonist (CSC) in a rat model of levodopa(L-DOPA) -induced dyskinesia (LID).Methods The hemi-parkinsonian rat model was produced by stereotaxically injecting 6-OHDA to the right medial forebrain bundle. Rats were randomly divided into 4 treatment groups with a random number generating program to receive intraperitoneal injections twice daily for 21 days (n = 10): saline, L-DOPA at 25 mg/kg with benserazide at 6. 25 mg/kg, CSC at 2. 5 mg/kg alone and CSC at 2.5 mg/kg with L-DOPA at 25 mg/kg plus benserazide at 6. 25 mg/kg. Forepaw adjusting steps, abnormal involuntary movements (AIM) and rotational response duration were observed on 2, 9, 11,18 and 21 d. After sacrifice, the expression of adenosine A2A R and mGluR5 was observed by Western blot. Results Co-administration of LDOPA with CSC significantly increased the forelimb adjusting steps of parkinsonian rats during 21 days of treatment when compared to L-DOPA alone. CSC treatment alone increased the forelimb adjusting steps significantly. Co-administration of L-DOPA with CSC ( ( 11 ± 5 ) score) significantly decreased the AIM scores of limb and orolingual muscles when compared to L-DOPA alone (( 17 ± 4) score; t = 2. 44, P ＜0. 05). The subchronic L-DOPA treatment upregulated the striatal expression of adenosine A2A R and mGluR5. However, co-administration of L-DOPA with CSC reversed the shortening of the rotational motor response duration induced by L-DOPA administration during the period of the treatment and attenuated the LDOPA-induced upregulation of adenosine A2A R and mGluR5 expressions. Conclusions CSC improves motor function in a hemi-parkinson rat model, potentiates the antiparkinsonian effects with L-DOPA and partly attenuates LID. Co-administration of L-DOPA with CSC reverses the L-DOPA-induced upregulated expression of A2A R and mGluR5, indicating the involvement of both A2A R and mGluR5 in the onset and progression of LID. Adenosine A2AR antagonists may be promising drugs for treatment of LID.     

托吡酯对小鼠汗腺组织乙酰胆碱酯酶表达及其活性的影响

目的 探讨托吡酯(TPM)对小鼠汗腺部位乙酰胆碱酯酶(AChE)的表达和活性的影响.方法 2周龄的幼鼠每天经灌胃给予TPM(80 mg/kg),连续给药1个月后,进行汗腺部位AChE免疫组织化学和蛋白免疫印迹检测,观察汗腺部位AChE活性的变化.结果 经TPM处理后汗腺AChE免疫荧光表达的吸光度(A)值为1.09±0.03,与对照组(0.98±0.09)比较差异无统计学意义(t=0.572,P＞0.05).蛋白免疫印迹表达结果亦差异无统计学意义(t=0.394,P＞0.05);汗腺组织匀浆后2组的AChE活性值分别为(1.42±0.38)μmol/mg和(1.37±0.42)μmol/mg,2组比较差异无统计学意义(t=0.746,P＞0.05).结论 TPM处理对汗腺部位的AChE免疫组织化学和蛋白免疫印迹表达及汗腺局部组织AChE活性无明显影响.     

过氧化物酶体增殖物激活受体γ激动剂对小鼠局灶性脑缺血再灌注损伤的保护作用

目的 探讨过氧化物酶体增殖物激活受体γ(pemxisome proliferator-activated receptor gamma,PPARγ)激动剂对小鼠局灶性脑缺血再灌注损伤的保护作用及其机制.方法 制作小鼠大脑中动脉阻塞再灌注(MCAO/R)模型.分别采用3%氯化三苯四唑(TTC)染色法、神经功能缺损评分法观察PPARγ激动剂对小鼠脑梗死体积和行为学的影响;紫外分光光度法检测脑组织髓过氧化物酶(myeloperoxidase,MPO)活性;逆转录一聚合酶链反应、免疫组织化学、Western blot法观察炎性因子[细胞间黏附因子-1(ICAM-1)、白细胞介素-1β(IL-1β)、环氧合酶-2(COX-2)]mRNA和蛋白表达变化.结果 PPARγ激动剂能够显著降低小鼠脑梗死体积(mm3,29.1±6.6,模型组为57.8±9.7,t=5.980,P<0.01)和行为学评分(1.2±0.4,模型组3.3±0.8,t=5.812,P<0.01);能减轻缺血脑组织MPO活性(U/g,0.049±0.005,模型组0.083±0.008,t=5.904,P<0.01);减少缺血脑组织炎性因子ICAM·1、IL-1β和COX-2 mRNA表达和蛋白表达.结论 PPARγ激动剂对小鼠脑缺血再灌注损伤有一定的保护作用,其作用机制与减轻缺血脑组织的炎症反应有关.     

腺苷A2A受体拮抗剂对大鼠氯化锂-毛果芸香碱所致癫痫模型的影响

目的研究腺苷A2A受体阻断剂对大鼠氯化锂-毛果芸香碱癫痫持续状态(SE)模型的影响。方法选取50只WD大鼠随机分为对照组、模型组及A2A受体阻断剂组。模型组采用氯化锂-毛果芸香碱腹腔注射复制癫痫模型,A2 A受体阻断剂组在氯化锂-毛果芸香碱注射前15 min予腹腔给药(SCH58261 0.05 mg/kg),对照组给予同等剂量生理盐水。在成功诱导癫痫发作40 min后予地西泮及水合氯醛终止发作,并于发作终止后24 h留取标本。尼氏染色法检测三组中海马神经元损伤情况,Westernblot法检测MAPKs(JNK/p-JNK、P38/p-P38和ERK/p-ERK)表达变化。结果对照组、模型组及A2A受体阻断剂组双侧海马CA3区正常形态神经元计数分别为158.6±8.4、59.8±7.4和123.4±5.0,模型组神经元计数显著低于对照组,差异具有统计学意义(P0.05),A2A受体阻断剂组神经元计数显著高于模型组,差异具有统计学意义(P0.05)。Westernblot法检测显示p-JNK、p-P38和p-ERK在模型组中表达明显增多,在A2A受体阻断剂组中p-JNK和p-P38表达减少。结论氯化锂-毛果芸香碱模型中,腺苷A2A受体阻断剂可能通过抑制p-JNK他p-P38的表达对神经元损伤起到保护作用。     

Sulforaphane protects primary cultures of cortical neurons against injury induced by oxygen-glucose deprivation/reoxygenation via antiapoptosis

Objective To determine whether sulforaphane (SFN) protects neurons against injury caused by oxygen-glucose deprivation/reoxygenation (OGD/R) and, if so, to investigate the possible mechanisms. Methods Primary cultures of neurons were prepared from the cerebral cortex of 1-day-old Sprague-Dawley rats. On days 5-6 in vitro, the neurons were exposed to OGD for 1 h, followed by reoxygenation for 24 h. Cells were treated with 0, 0.1, 0.2, 0.5, 1, 2.5, or 5 μmol/L SFN, with or without 10 μmol/L LY294002, a PI3K-specific inhibitor, during OGD/R (a total of 25 h). After 24-h reoxygenation, MTT was used to assess viability and injury was assessed by Hoechst 33258/propidium iodide (PI) staining; immunofluorescence staining and Western blot were performed to detect molecular events associated with apoptosis. Results The MTT assay showed that 1 μmol/L SFN significantly increased viability, and Hoechst 33258/PI staining showed that the numbers of injured neurons were reduced significantly in the SFN group. Furthermore, immunofluorescence staining and Western blot showed that SFN increased Bcl-2 and decreased cleaved caspase-3 levels. Moreover, LY294002 inhibited the phosphorylated-Akt expression evoked by SFN, decreased Bcl-2 expression and increased cleaved caspase-3 expression. Conclusion SFN protects neurons against injury from OGD/R and this effect may be partly associated with an anti-apoptosis pathway.     

Sodium channel Nav1.6 is up-regulated in the dorsal root ganglia in a mouse model of type 2 diabetes

Neuropathic pain is one of the most common chronic complications of diabetes, of which the underlying mechanisms are unclear. Expression changes of voltage-gated sodium channels in dorsal root ganglia (DRG) are involved in the production of ectopic spontaneous activity. In the present study, we examined the changes of DRG Nav1.6 expression in a mouse model of type 2 diabetes (db/db mice). Db/db mice developed significant and persistent mechanical allodynia from postnatal 2 months compared to the heterozygous littermates (db/+) and C57 mice. Immunofluorescent staining showed that Nav1.6 was highly expressed in the normal DRG (approximately 31.3±5.2% of total DRG neurons), especially in the large-diameter neurons. In postnatal 5 months in db/db mice, percentage of Nav1.6 positive cells (62.9±5.5%) was significantly higher than that in C57 and db/+ mice. Western blot showed that from 2 to 5 months, Nav1.6 was increased by 1.67±0.16, 2.12±0.23, 1.89±0.32, and 2.01±0.35 folds of C57 mice, which were significantly higher than that of the C57 and db/+ mice. Real-time PCR showed that in postnatal 1 month of db/db mice, mRNA level of Nav1.6 was increased by 1.72±0.22 fold, which was significantly higher than that of C57 and db/+ mice. Nav1.6 mRNA was increased thereafter and maintained at high levels throughout the observed period. Our results provide direct evidence that type 2 diabetes induces significant and persistent increase of Nav1.6 expression in the DRG, which may participate in the diabetic neuropathic pain.     

局灶性脑缺血再灌注大鼠过氧化物酶体增殖物激活受体γ核移位的改变

目的 观察过氧化物酶体增殖物激活受体γ(PPARγ)在脑缺血再灌注损伤中核移位的改变,并初步探讨该改变在脑缺血损伤中的意义.方法 健康雄性SD大鼠制作大脑中动脉阻塞再灌注模型,缺血60 min,再灌注4、8、24 h.采用Western blot法、免疫组织化学和免疫荧光染色法观察PPARγ核移位的改变以及PPARγ激动剂和拮抗剂对PPARγ核移位的影响;同时,2,3,5-氯化三苯四唑(TTC)染色法观察脑梗死体积的改变.结果 (1)Western blot检测显示,脑缺血再灌注4 h即引起PPARγ核蛋白增加,同时胞质蛋白减少,差异具有统计学意义.随再灌注时间的增加,PPARγ核移位呈时间依赖性增强.免疫组织化学和免疫荧光染色均显示,与假手术组48.3%相比,缺血再灌注24 h胞核PPARγ阳性增加到80.3%,差异具有统计学意义(t=8.63,P=0.00).(2)与单纯缺血再灌注组相比,PPARγ激动剂进一步增加PPARγ核蛋白表达,同时减少胞质蛋白表达,差异均具有统计学意义;相反,PPARγ抑制剂GW9662则降低核蛋白水平而增加胞质表达,差异均具有统计学意义.(3)经TTC染色显示,与单纯缺血再灌注组相比,PPARγ激动剂使脑梗死体积减少了48.40%(15.46±4.94与29.96 ±3.39,t=5.93,P=0.00);而PPARγ抑制剂则使脑梗死体积增加了58.95%(47.62±4.93与29.96±3.39,t=7.23,P=0.00).结论 脑缺血再灌注损伤使大鼠PPARγ核移位增加,该改变可能是脑组织的一种自我保护性反应.     

C1q肿瘤坏死因子相关蛋白6破坏大鼠脑缺血再灌注损伤后血脑屏障的机制研究

目的 探讨C1q肿瘤坏死因子相关蛋白6（C1q and tumor necrosis factor related protein 6，C1QTNF6） 对大鼠大脑中动脉缺血再灌注（middle cerebral artery occlusion reperfusion，MCAO/R）后血脑屏障及内皮细胞闭合蛋白（occludin）和闭锁小带蛋白-1（zonula occludens 1，ZO-1）表达的影响。