盐酸戊乙奎醚预处理对大鼠脑缺血再灌注损伤的保护作用

将雄性SD大鼠随机分为假手术组（Sham组）、缺血再灌注组（I／R组）、东莨菪碱组（Sco组）和盐酸戊乙奎醚组（PH组）。观察测定各组脑梗死体积、大鼠海马神经细胞形态的变化及海马组织N-甲-D-天门冬氨酸（NMDA）受体NR1亚基mRNA的表达水平。结果显示，与I／R组比较，再灌注后PH组脑梗死体积显著减少，海马神经元细胞损伤显著减轻，NMDA受体mRNA表达水平显著降低。认为盐酸戊乙奎醚预处理可以显著改善大鼠局灶脑缺血再灌注后海马神经细胞损伤，从而对脑缺血再灌注损伤发挥保护作用。     

N-甲基-D-天冬氨酸受体阻断对大鼠海马神经元癫痫样放电模型泛连接蛋白-1表达的影响

目的观察N-甲基-D-天冬氨酸(NMDA)受体阻断对大鼠海马神经元癫痫样放电模型神经元细胞活力,凋亡及泛连接蛋白(Panx)-1表达的影响。方法取SD新生乳鼠双侧海马,体外培养海马神经元至第9天,经鉴定的海马神经元随机分为正常对照组、模型组和MK-801(地卓西平,NMDA受体拮抗剂)组。正常对照组为正常细胞的细胞培养液培养3 h后恢复维持培养液;模型组为无镁细胞外液培养3 h后恢复维持培养液;MK-801组加入含10μmol/L MK-801维持培养液预保护30 min,更换为无镁细胞培养液培养3 h后恢复维持培养液。模型建立24 h后,采用细胞计数试剂盒(CCK-8)检测神经元细胞活力,分别采用末端脱氧核苷酸转移酶介导的d UTP缺口末端标记测定法(TUNEL)法和流式细胞仪膜联蛋白V-异硫氰酸荧光素/碘化丙啶(Annexin V-FITC/PI)双染法检测神经元凋亡,采用蛋白质印迹法(Western印迹)检测神经元Panx-1表达,采用实时荧光定量PCR(Real Time-PCR)检测神经元Panx-1 mRNA表达。结果与模型组比较,MK-801组神经元细胞活力显著升高(P<0.05),神经元凋亡指数和凋亡率、Panx-1表达、Panx-1 mRNA表达显著降低(P<0.05)。结论 NMDA受体阻断可抑制大鼠海马神经元癫痫样放电模型神经元损伤,发挥神经元保护作用,并抑制神经元Panx-1表达。     

大鼠全脑缺血再灌注后海马CA1区神经元凋亡机制的研究

目的 研究大鼠全脑短暂缺血再灌注后海马CA1区椎体神经元的死亡机制.方法 采用经典的四血管夹闭法制作大鼠全脑缺血再灌注模型,取缺血再灌注后不同时间(6 h、24 h、48 h)的海马CA1区脑组织,用ELISA检测Caspase-3的活性变化.同时运用免疫印记方法检测PKC、NMDA受体NR2A及NR2B亚基磷酸化水平的变化.结果 与对照组相比,Caspase-3检测显示缺血再灌注6 h、24 h、48 h海马CA1区椎体神经元呈现逐渐凋亡增多的迟发性死亡.磷酸化蛋白激酶C在缺血6 h即有明显增高,并且于24 h、48 h达到表达高峰(P<0.05);NMDA受体亚基NR2A和R2B的磷酸化水平缺血再灌注后均呈现明显升高趋势.讨论 PKC、NR2B、CaMⅡ级联反应的发生可能是大鼠全脑缺血再灌注后海马CA1区锥体神经元发生迟发性死亡的重要机制.     

N-甲基-D-天冬氨酸受体阻断对癫痫模型大鼠行为学、脑电图及脑内泛连接蛋白-1表达的影响

目的观察N-甲基-D-天冬氨酸(NMDA)受体阻断对癫痫模型大鼠行为学、脑电图及海马和颞叶泛连接蛋白(Panx)-1表达的影响。方法 SD大鼠应用随机数字表法分为正常对照组,模型组(以海人酸复制癫痫模型),地卓西平(MK-801)0.5、1.0、1.5 mg/kg组,每组10只。MK-801 0.5、1.0、1.5 mg/kg组腹腔注射相应剂量的MK-801,正常对照组和模型组腹腔注射等量的生理盐水,1次/d,连续21 d。观察MK-801对癫痫大鼠行为学、脑电图及脑内Panx-1和Panx-1 mRNA表达的影响。结果与模型组比较,MK-801 0.5、1.0、1.5 mg/kg组Racine分级显著降低,平均癫痫发作时间显著缩短,脑电频率显著升高,脑电波幅显著降低,脑内Panx-1和Panx-1 mRNA表达显著降低(P0.05或P0.01)。结论 NMDA受体阻断可改善癫痫大鼠行为学及脑电图异常,并抑制脑内Panx-1表达。     

丹皮酚对心肌缺血再灌注损伤大鼠模型肿瘤坏死因子-α和Toll样受体4表达的影响

目的探讨丹皮酚对大鼠心肌缺血再灌注损伤保护中肿瘤坏死因子(TNF)-α及Toll样受体(TLR)4表达的影响。方法清洁级成年雄性SD大鼠36只随机分为假手术组、缺血再灌注组、丹皮酚低剂量组和丹皮酚高剂量组每组9只;通过结扎左冠脉前降支30 min再灌注2 h建立大鼠心肌缺血再灌注模型。通过TTC染色法检测大鼠梗死心肌体积;ELISA法检测血液中TNF-α的含量;通过免疫组化法检测缺血坏死心肌组织TLR4的表达。结果与缺血再灌注组相比,丹皮酚低剂量组和丹皮酚高剂量组心肌梗死体积减小,TNF-α表达减少;心肌组织TLR4水平明显降低;其中丹皮酚高剂量组更明显。结论丹皮酚能够明显降低大鼠心肌缺血再灌注损伤,这种作用可能与减轻缺血再灌注中大鼠心肌TNF-α及TLR4表达有关。     

低分子肝素对局灶性脑缺血大鼠再灌注后细胞凋亡及NMDA受体Ⅰ型亚单位mRNA表达的影响

目的研究低分子肝素（LMWH）对局部脑缺血再灌注后脑组织中NMDA受体Ⅰ型亚单位（NR1）mRNA表达及细胞凋亡的影响，探讨LMWH对缺血再灌注后神经元的保护作用及可能机制。方法参照Zea Longa线栓法制作大鼠大脑中动脉阻塞模型（MCAO），140只SD大鼠被随机分成假手术组、缺血再灌组（MCAO组）和LMWH干预组。每组大鼠再随机分成4组：分别在再灌注后6h、24h、48h、96h处死。进行TUNEL染色检测缺血区细胞凋亡情况，并用原位杂交方法检测NR1 mRNA。结果MCAO组大鼠大脑皮质梗死灶的凋亡细胞和NR1mRNA表达与假手术组比较明显增强（P〈0．01），而LMWH干预组未能阻止再灌注后凋亡的发生，且阳性细胞数48h最多，与6h、24h比较有统计学意义（P〈0．01），但与MCAO组比较有凋亡细胞数明显减少（P〈0．01）。结论再灌注后脑组织中NR1mRNA表达增强，与细胞凋亡密切相关。低分子肝素可能通过抑制NR1mRNA的表达，抑制缺血半暗区的细胞凋亡。     

电针对脑缺血再灌注模型大鼠纹状体NMDA受体NR2亚基蛋白表达的影响

目的 观察脑缺血再灌注模型大鼠受损侧纹状体组织中NMDA受体调节亚单位NR2A和NR2B蛋白表达及其电针干预后的变化,探讨电针对缺血再灌注兴奋性氨基酸毒性的拮抗作用,进一步阐明电针治疗缺血性脑血管疾病的机制.方法 用数字随机表将15只SD大鼠随机分成3组:假手术组、模型组、电针组,每组各5只.采用改良Longa线栓法制作大脑中动脉短暂性缺血再灌注模型,电针组大鼠在再灌同时电针“百会”、“大椎”两穴(连续波,频率3 Hz,电流强度1～3 mA),30 min,深度均为10 mm.免疫组织化学法及图像处理系统检测分析大鼠受损侧纹状体NR2A、NR2B蛋白表达情况.结果 与假手术组相比,模型组大鼠纹状体组织中NR2A的表达量明显下降,而NR2B的表达量明显升高,给予电针“百会”、“大椎”穴后的大鼠纹状体组织NR2A表达细胞数及含量均明显高于模型组,表达NR2B的细胞数及含量均明显降低.结论 电针可能通过激活NR2A受体蛋白表达,抑制NR2B受体蛋白的过量表达,从而调节NMDA受体复合物的整体功能活性,减少NMDA受体介导的兴奋性氨基酸毒性反应,减轻脑缺血再灌注引起的局灶性脑损伤,发挥一定的脑神经保护作用.     

大鼠脑缺血再灌注后腺病毒表达GluR羧基肽段对脑组织JNK磷酸化的影响

目的探讨大鼠脑缺血再灌注（IR）后腺病毒表达谷氨酸受体（GluR）羧基肽段对海马CA1区神经元的保护作用和JNK磷酸化的影响。方法将SD大鼠随机分为假手术组、IR对照组、表达病毒组、非表达病毒组及溶剂组。采用焦油紫染色、免疫印迹检测大鼠IR后海马神经元损伤和脑组织JNK的磷酸化情况。结果与IR对照组、非表达病毒组及溶剂组比较,表达病毒组海马CA1区神经元损伤明显减轻,脑组织JNK磷酸化程度明显降低（P均〈0．05）。结论腺病毒表达GluR羧基肽段可能通过降低脑组织JNK磷酸化程度对海马CA1区神经元起保护作用。     

脑通胶囊对VD大鼠海马组织NMDA受体1亚基和2B亚基mRNA表达的影响

目的观察脑通胶囊对血管性痴呆(VD)模型大鼠学习记忆、海马组织N-甲基-D-天冬氨酸(NMDA)受体1亚基和2B亚基mRNA表达的影响。方法采用改良的四血管法(14-VO)制备VD模型,Morris水迷宫测定大鼠学习、记忆能力,实时荧光定量PCR检测NMDA受体1亚基和2B亚基mRNA的表达情况。结果与模型组比较,脑通胶囊大、中剂量组逃避潜伏期缩短,穿越原平台次数增加,NMDA受体1亚基mRNA表达降低,NMDA受体2B亚基mRNA表达升高(P<0.05,P<0.01)。结论脑通胶囊可降低NMDA受体1亚基mRNA的表达,提高NMDA受体2B亚基mRNA的表达,从而改善VD大鼠学习、记忆能力。     

二氮嗪预处理对Aβ_(1~42)作用神经元NR2B亚基蛋白表达的影响

目的研究ATP敏感的钾离子通道开放剂二氮嗪(diazoxide)预处理对Aβ1~42作用原代培养神经元N-甲基-D-天冬氨酸(NMDA)受体2B(NR2B)亚基蛋白表达的影响。方法原代培养大鼠皮层海马神经元并进行鉴定,将细胞随机分为对照组、单纯Aβ1~42干预组、二氮嗪预处理1h后Aβ1~42干预组(Aβ1~42+diazoxide)、单纯二氮嗪预处理组,并采用免疫印迹检测不同时间点(24 h、72 h)细胞NR2B亚基蛋白表达水平的变化。结果 Aβ1~42(2μmol/L)作用神经元24 h后,与对照组相比,单纯Aβ1~42干预组和Aβ1~42+diazoxide组的NR2B亚基蛋白表达均无明显改变。Aβ1~42作用神经元72 h后,与对照组比较,单纯Aβ1~42组NR2B亚基蛋白表达量显著升高(P0.05);而与单纯Aβ1~42干预组相比,Aβ1~42+diazoxide组NR2B亚基蛋白表达明显降低(P0.05)。结论 Aβ1~42作用原代培养神经元72 h,能够显著增加神经细胞NR2B亚基蛋白的表达量;同时,二氮嗪能拮抗Aβ1~42所引起的NR2B亚基蛋白表达量升高,提示二氮嗪可能通过NMDA受体通路影响Aβ1~42的细胞毒性作用。     

Prenatal ethanol exposure modifies [3H]MK-801 binding to NMDA receptors: spermidine and ifenprodil

BACKGROUND: It has been suggested that abnormalities seen in fetal alcohol syndrome are linked with NMDA receptor malfunction. Our laboratory has previously shown that prenatal ethanol treatment decreases [3H]MK-801 binding density at postnatal day 21, when NMDA receptor subunit protein levels were unaltered. Thus, the focus of the present study was to examine whether prenatal ethanol modifies native NMDA receptor levels. METHODS: Cerebral cortices were taken from offspring born to three treatment groups of pregnant Sprague Dawley(R) rats: an ethanol group given an ethanol liquid diet during the gestational period, a pair-fed control group that received a liquid diet without ethanol, and an ad libitum group fed rat chow and tap water. Western blot studies were carried out at postnatal days 1, 7, 14, and 21 to examine total protein expression of NR1 and NR1b splice variants. NR2 subunit levels were examined by [3H]MK-801 binding studies using spermidine, an endogenous polyamine, and ifenprodil, a selective NR2B antagonist. RESULTS: [3H]MK-801 binding density was significantly reduced in prenatal ethanol-treated groups compared with ad libitum and pair-fed control groups. Spermidine increased [3H]MK-801 binding, although potentiation by spermidine was not significantly different among all three experimental groups. Furthermore, no significant differences in total protein expression of NR1 or NR1b splice variants were observed in cortical membrane homogenates at postnatal days 1 through 21. [3H]MK-801 binding in the presence of ifenprodil showed that prenatal ethanol treatment significantly decreased low-affinity ifenprodil binding. High-affinity ifenprodil binding was reduced in both pair-fed and ethanol-treated groups. CONCLUSIONS: These results suggest that prenatal ethanol treatment reduces [3H]MK-801 binding and that this reduction may be due to a decrease in NR2A subunits.     

Behavioral Sensitivity and Ethanol Potentiation of the N-Methyl-d-Aspartate Receptor Antagonist MK-801 in a Rat Line Selected for High Ethanol Sensitivity

The role of the N -methyl-d-aspartate (NMDA) receptors in differential ethanol sensitivity of the alcohol-insensitive [alcohol-tolerant (AT)] and alcohol-sensitive [alcohol-nontolerant (ANT)] rat lines selected for low and high sensitivity to ethanol-induced (2 g/kg) motor impairment was studied in behavioral and neurochemical experiments. A noncompetitive antagonist of the NMDA receptor, dirocilpine mal-eate (MK-801; 0.2 mg/kg), impaired motor function in ANT rats, but not in AT rats, in a tilting plane test. The impairment was further potentiated by a dose (0.75 glkg) of ethanol, which alone was inactive. This effect was apparently not associated with the locomotor stimulation produced by MK-801 (0.1 and 0.2 mg/kg), because stimulation did not differ between the rat lines. Locomotor stimulation was potentiated by the low ethanol dose in both rat lines. Ethanol treatment decreased the cerebellar and hippocampal cGMP concentrations both with and without MK-801 pretreatment in both rat lines. In situ hybridization using oligonucleotide probes specific for NMDA receptor subunit mRNAs NR1 and NR2A, B, C, and D revealed no clear differences in brain regional expression between ANT and AT rats. These results indicate that the alcohol-sensitive ANT rats are very sensitive to a low dose of ethanol in the presence of NMDA receptor antagonism, consistent with the hypothesis that this receptor system is involved in acute ethanol intoxication.     

钙调蛋白抑制剂对N-甲基-D-天冬氨酸诱导的大鼠皮质神经元损伤的保护作用

目的观察钙调蛋白抑制剂w_7对N-甲基-D-天冬氨酸（NMDA）诱导的皮质神经元损伤的影响,并探讨其可能的机制。方法原代培养sD大鼠（120只）皮质神经元,神经元特异性稀醇化酶（NSE）染色方法确定神经元的比例;添加不同浓度的NMDA,制备细胞损伤模型,MTT法评估细胞生存力;原代大鼠皮质神经元培养后,随机分为对照组、损伤组（NMDA）、不同剂量w-7保护组（25、50、100μmol／L）,MIT法评价细胞生存力;对上述各组进行吖啶橙荧光染色,观察细胞凋亡形态;采用WesternBlot方法,测定上述各组神经元的p38MAPK和NF-kBp65表达情况。结果①以NSE抗体标记培养的神经元,阳性神经元的比例为90．86％。②不同浓度的NMDA对培养大鼠皮质神经细胞具有损伤作用,实验结果表明50μmol／L的NMDA对细胞的损伤以凋亡为主,以此剂量做后续实验。③与对照组比较,损伤组的吸光度（A）值降低,差异有统计学意义,P〈0．01;与损伤组比较,w-7各保护组A值均升高（P〈0．01或P〈0．05）,差异有统计学意义。④吖啶橙荧光染色可观察到凋亡细胞,保护组随着w-7剂量的增加凋亡细胞数量减少。（5）WesternBlot结果显示,w-7可以使p38MAPK和NF-KBp65表达下降,差异有统计学意义（P〈0．05或P〈0．01）。结论w-7可能通过降低p38MAPK和NF．KBp65的途径,对NMDA诱导的神经元损伤起保护作用。     

3’-甲氧基葛根素抗大鼠脑缺血再灌注损伤作用

目的探讨3’-甲氧基葛根素（3＇-MOP）在大鼠脑缺血再灌损伤中的神经保护作用。方法24只大鼠随机分为脑缺血再灌组（IR组）、IR＋3’-MOP组和对照组。HE染色观察海马CA1区神经元的组织形态学变化;TUNEL染色检测海马CA1区神经元阳性凋亡细胞数。结果IR＋3＇-MOP组海马CA1区神经元的损伤减轻,细胞存活数显著多于IR组,而凋亡细胞数显著少于IR组。结论3＇-MOP可经抑制凋亡的发生,减轻海马CA1区神经元缺血再灌损伤。     

Role of N-methyl-D-aspartate receptor in hyperoxia-induced lung injury

Glutamate (Glu) N-methyl-D-aspartate (NMDA) receptor is present in the lungs, and NMDA receptor antagonist MK-801 attenuates oxidant lung injury. We hypothesized that Glu excitotoxicity may participate in the pathogenesis of hyperoxia-induced lung injury. To determine possible pulmonary protective effects, we administered 0.05 ml/kg MK-801 or saline intraperitoneally daily to neonatal rats exposed to more than 95% oxygen in air. After 7 days, MK-801 decreased the hyperoxia-associated elevation of wet-to-dry lung weight, total leukocyte and neutrophil counts, total protein and lactate dehydroase in BAL fluid, total myeloperoxidase activity, and lung pathological injury. MK-801 inhibited hyperoxia-associated increments in reactive oxygen species production and NF-kappaB production. Hence, NMDA receptor antagonist MK-801 ameliorates hyperoxia-induced lung injury in neonatal rats, and is associated with decreased reactive oxygen species and NF-kappaB. We conclude that Glu may play an important role in hyperoxia-induced lung injury by activation of NMDA receptor.     

局部亚低温对大鼠局灶脑缺血再灌注后β淀粉样蛋白表达及梗死体积的影响

目的观察病变侧缺血至再灌注期亚低温（32～33℃）对大鼠局灶性脑缺血再灌注后梗死体积和β淀粉样蛋白（β—amyloid protein,Aβ）表达的影响。方法采用改良线栓法建立大鼠大脑中动脉缺血再灌注模型,随机分为假手术组、常温缺血组和亚低温缺血组,两个缺血组各分为5个亚组：分别于缺血后2、3、6、8、12h进行再灌注4h后处死,其中亚低温组于缺血后30min实施病灶侧脑部亚低温并持续至再灌注期。处死大鼠前进行神经功能缺陷评分,TTC染色及运用计算机图像分析技术观察各组大鼠脑梗死体积,采用免疫组织化学法检测Aβ表达,末端脱核苷酸转移酶介导的dUTP缺口末端标记技术（TUNEL）观察神经细胞凋亡情况。结果与常温缺血组比较,亚低温缺血组大鼠脑梗死体积明显减少,Aβ阳性细胞数量明显减少（P〈0．05）,凋亡的神经细胞明显减少（P〈0．05）。神经功能缺陷评分亚低温缺血组明显低于相应时间点常温缺血组（P〈0．05或P〈0．01）。结论病变侧亚低温对脑缺血有保护作用,其机制可能为亚低温抑制Aβ表达,进而抑制神经元凋亡,减少脑梗死体积,促进脑缺血后神经功能恢复。     

MK-801 can exacerbate or attenuate behavioral alterations associated with neonatal alcohol exposure in the rat, depending on the timing of administration

BACKGROUND: We have reported that administration of MK-801, an NMDA receptor antagonist, during ethanol withdrawal in the developing rat attenuates ethanol's adverse effects on behavioral development. In the present study, we altered the timing of MK-801 delivery in relation to the last alcohol dose to determine if its protective effects were specific to the ethanol withdrawal phase. METHODS: Five groups of rats were artificially reared and exposed to alcohol in a binge-like manner on postnatal day (PD) 6, producing peak blood alcohol levels of 335 mg/dl that cleared to 0 mg/dl by 33 hours. Four groups received MK-801 at various times after alcohol treatment (0, 9, 21, or 33 hr post-ethanol). The fifth alcohol-treated group received saline. Two artificially reared control groups were included: one was injected with saline and the other injected with 0.5 mg/kg MK-801. Finally, a normally reared suckle control group was also included. Activity level and performance on a spatial discrimination reversal-learning task were evaluated at PD 18 and PD 40, respectively. RESULTS: Administration of MK-801 at the same time as ethanol treatment (0 hr) produced a high rate of mortality. Ethanol exposure on PD6 increased activity level relative to controls. Administration of MK-801 at 0 hr exacerbated this ethanol-induced overactivity, whereas administration of MK-801 at 21 and 33 hr reduced the severity of ethanol-related overactivity. Similarly, ethanol exposure on PD 6 significantly increased the number of errors committed on a spatial discrimination reversal-learning task. MK-801 injections 9 hrs after ethanol exacerbated this effect, whereas MK-801 treatment 33 hrs after ethanol attenuated this effect. Thus, MK-801 administration at the time of ethanol treatment was highly toxic, whereas during the withdrawal period it was protective. CONCLUSION: These data are consistent with the hypothesis that ethanol exposure in the neonatal rat inhibits the NMDA receptor, producing a subsequent rebound in NMDA receptor activation and possible excitotoxicity during withdrawal. Both the acute inhibitory effects of ethanol and the excitatory effects of withdrawal may contribute to fetal alcohol effects.     

炎症后内脏高敏感大鼠前扣带回皮质NR2A、NR2B表达变化

背景:研究显示N-甲基-D-天冬氨酸(NMDA)受体参与了伤害性信号的传递,中枢前扣带回皮质(ACC)在内脏高敏感大鼠内脏疼痛反应的调节中起重要作用,该作用是由NMDA受体活性增强介导的。目的:检测炎症后内脏痛觉过敏大鼠ACC区域NMDA受体亚基NR2A、NR2B的表达变化,探讨两者在炎症后内脏高敏感形成中的作用。方法:以去氧胆酸结肠灌注建立炎症后内脏痛觉过敏大鼠模型。造模3周后观察实验组和对照组结肠组织病理学改变,以对结直肠扩张(CRD)的内脏运动反射(VMR)幅值为指标评价内脏痛敏感性的变化,以免疫荧光法和蛋白质印迹法检测ACC区域NR2A、NR2B表达情况。结果:实验组和对照组大鼠结肠组织均未见明显病理学改变。CRD压力为60 mm Hg(伤害性刺激)时,实验组VMR幅值显著高于对照组(P0.05)。与对照组相比,实验组ACC区域NR2A、NR2B荧光强度和蛋白表达量均显著上调(P0.05)。结论:ACC区域NMDA受体亚基NR2A、NR2B表达上调在炎症后内脏高敏感的形成中发挥重要作用。     

粉防己碱抑制心肌细胞磷酸化减轻缺血/再灌注损伤引发的炎症反应

目的:探讨心肌缺血/再灌注过程中粉防己碱(Tet)对核转录因子(NF)-κB的抑制因子(IκB-α)磷酸化及肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)表达的影响以及机制。方法:60只SD大鼠被随机分为3组:缺血/再灌注损伤组(I/R)、假手术组、粉防己碱治疗组(Tet)。I/R组结扎大鼠左前降支造成心肌缺血30min后再灌注24h,然后处死大鼠;假手术组只穿针不结扎,余步骤同I/R组;Tet组在缺血前20min腹腔注射Tet,余步骤同I/R组。处死大鼠24h后取心肌标本,用酶联免疫吸附法(ELISA)检测心肌组织中TNF-α、IL-6表达水平,应用免疫组织化学方法检测磷酸化IκB-α(P-IκB-α)的表达。结果:Tet组与I/R组相比TNF-α、IL-6表达水平明显减低[(208.40±25.12)pg/ml∶(306.65±17.78)pg/ml,(587.40±137.40)pg/ml∶(1003.75±138.33)pg/ml,P均0.01],而Tet组与假手术组相比表达明显增强[(208.40±25.12)pg/ml∶(61.45±9.20)pg/ml,(587.40±137.40)pg/ml∶(229.25±90.13)pg/ml,P均0.01]。Tet组大鼠心肌细胞胞浆中P-IκB-α的表达明显低于I/R组[(0.0817±0.09)pg/ml∶(0.1755±0.01)pg/ml,但明显高于假手术组[(0.0817±0.09)pg/ml∶(0.0513±0.03)pg/ml,P均0.01]。结论:Tet可以抑制IκB-α磷酸化,显著减少前炎症因子TNF-α、IL-6的产生,减轻心肌缺血/再灌注损伤。