幽门螺杆菌VacA蛋白体外诱导胃上皮AGS细胞内HMGB1的表达

摘要：目的：探讨幽门螺杆菌（Hp）感染的胃上皮AGS细胞内高迁移率族蛋白B1(high mobility group box 1, HMGB1)的表达。 方法：Hp11638（CagA⁺,VacA⁺）和Hp11638突变株（Hp11638M,CagA⁺,VacA^-）的提取液与AGS细胞共同温育后,收集细胞及培养上清液。裂解AGS细胞,western blot分析AGS细胞内HMGB1的表达,ELISA法检测培养上清液中HMGB1的水平。 结果:Hp11638提取液刺激AGS细胞后HMGB1表达量为(123.33±25.2) μg/mL,明显高于Hp11638M提取液刺激后的(46.67±7.23) μg/mL（q=8.49,P<0.01）。Hp11638和Hp11638M提取液刺激的AGS细胞培养上清液中HMGB1的水平分别为（115.59±16.62）和（48.32±6.30） ng/mL,差异有统计学意义（q=12.25,P<0.01）。 结论:在胃炎发生、发展过程中,VacA蛋白是刺激细胞中HMGB1高表达的主要因子。     

缺氧对巨噬细胞HMGB1释放的影响及其机制

目的观察缺氧对巨噬细胞高迁移率族蛋白B1(HMGB1)释放的诱导作用,并初步探讨其可能的机制。方法采用巨噬细胞株RAW264.7,观察缺氧培养不同时间对培养上清液中HMGB1含量、细胞HMGB1mRNA表达和HMGB1胞内分布的影响,及不同浓度N-乙酰半胱氨酸对HMGB1释放的抑制作用。HMGB1含量和HMGB1mRNA表达水平分别采用酶联免疫吸附试验、实时荧光定量PCR法检测。结果缺氧培养6h后HMGB1mRNA表达水平已显示增强(P0.05),缺氧培养12h后培养上清液中HMGB1含量明显升高(P0.01),且显示HMGB1核浆转移;N-乙酰半胱氨酸对缺氧培养HMGB1释放有剂量依赖性抑制作用。结论缺氧能诱导巨噬细胞释放HMGB1,其机制可能与胞内氧自由基产生有关。     

重症急性胰腺炎大鼠HMGB1对肠上皮细胞occludin表达的影响

目的 观察重症急性胰腺炎(SAP)大鼠肠组织中高迁移率族蛋白B1 (HMGB1)表达对肠黏膜上皮细胞紧密连接occludin蛋白表达的影响.方法 逆行胰胆管注射5％牛磺胆酸钠制作SAP模型.健康Wistar大鼠随机(随机数字法)分为对照组、SAP组、二硫代氨基甲酸吡咯烷(PDTC)处理组.测定血淀粉酶(AMY)、内毒素(LPS)及D-乳酸水平;光镜下观察胰腺和肠组织的病理变化;免疫组织化学法观察occludin分布和表达的变化;RT-PCR法检测大鼠肠组织中HMGB1的表达水平;Western blot法检测大鼠肠组织中HMGB1及occludin蛋白的表达水平.采用SPSS 13.0统计分析软件进行处理,P＜ 0.05为差异具有统计学意义.结果 在建模后24 h,SAP组大鼠血浆LPS及D-乳酸水平明显高于对照组,提示肠屏障通透性明显增加;PDTC处理组大鼠血浆LPS及D-乳酸水平明显低于SAP组(P＜0.05).SAP组大鼠肠组织HMGB1表达水平较对照组明显升高,而occludin蛋白的表达较对照组下降;PDTC组大鼠肠组织HMGB1表达水平明显低于SAP组,occludin水平较SAP组升高(P＜0.05).结论 SAP时,大鼠肠组织内HMGB1表达升高,通过降低occludin蛋白表达,来增加肠黏膜屏障通透性;PDTC可抑制HMGB1表达,上调occludin蛋白表达,改善肠黏膜屏障通透性.     

大鼠肺移植后高迁移率族蛋白B1表达增强

目的观察大鼠肺移植后肺组织高迁移率族蛋白B1（HMGB1）表达和血清HMGB1水平的改变。方法 42只大鼠随机分为对照组（6只）、移植2h组（12只）、移植6h组（12只）和移植12h组（12只）,三套管法建立大鼠左肺原位移植模型。使用实时荧光定量逆转录多聚酶链反应检测肺组织HMGB1mRNA水平,使用免疫印迹法和免疫荧光染色分析肺组织HMGB1蛋白水平。血清中HMGB1、TNF-α、IL-1β和IL-6含量采用ELISA法检测。结果大鼠肺移植后2h肺组织HMGB1mRNA表达和HMGB1蛋白含量即见显著升高（P〈0.01）,并随时间延长而增强。大鼠肺移植后各时间点血清HMGB1、TNF-α、IL-1β和IL-6水平均明显升高（P〈0.01）。结论大鼠肺移植术后HMGB1表达发生明显改变,HMGB1参与肺移植缺血再灌注损伤过程。     

辛伐他汀干预对大鼠动脉粥样硬化斑块内高迁移率族蛋白B1表达的影响

目的 观察辛伐他汀对动脉粥样硬化(AS)大鼠高迁移率族蛋白B1(HMGB1)表达及斑块形态学的影响,以期揭示其抗AS的作用机制.方法 60只Wistar大鼠按随机数字表法均分为对照组、AS模型组、辛伐他汀干预组.给予高脂饮食同时灌胃维生素D3建立AS模型;干预组于第8周开始给予辛伐他汀2.5 mg·kg-1·d-1灌胃;各组分别于10周、12周用免疫组化法检测主动脉粥样硬化斑块内HMGB1蛋白表达,实时逆转录-聚合酶链反应(RT-PCR)检测HMGB1 mRNA表达,并观察主动脉斑块形态学变化.结果 模型组主动脉斑块内HMGB1蛋白表达呈强阳性,辛伐他汀干预组HMGB1表达较模型组明显减少,12周时更为显著.与对照组比较,模型组10周、12周时HMGB1 mRNA表达均明显升高(10周:19.695±1.418、比2.981±0.753,12周:20.542±1.132比3.219±0.332,均P<0.01);辛伐他汀干预组10周、12周HMGB1mRNA表达(15.798±0.891,12.641±0.734)明显低于模型组相应时间点,且12周时表达低于10周时(P<0.05或P<0.01).模型组主动脉内有明显钙化斑块,呈环状,斑块遍及整条动脉;辛伐他汀干预后可明显抑制斑块形成,12周斑块面积较10周时进一步减小.结论 辛伐他汀能减轻AS大鼠主动脉粥样斑块形成,降低斑块组织中HMGB1的蛋白及mRNA表达,通过减轻炎症反应起到血管保护作用.     

原发性肝癌高迁移率族蛋白B1表达改变及其机制

目的研究原发性肝癌（PHC）组织高迁移率族蛋白B1（HMGB1）表达改变和诱导机制,及PHC患者血清HMGB1水平变化和意义。方法对38例慢性乙肝、32例乙肝后肝硬化、23例继发性肝癌、39例PHC患者和48例健康对照者的血清HMGB1水平进行测定和分析。采用RT-PCR方法,检测11例PHC组织及其癌旁组织中的HMGB1基因表达水平。观察缺氧培养对肝癌细胞株SMMC-7721HMGB1基因表达和胞外释放的影响。结果PHC患者血清HMGB1水平（13．5±6．3μg／L）明显高于健康对照者（3．9±1．4μg／L）,并与AFP水平、TNM分期有关。PHC组织中HMGB1mRNA表达增强。SMMC-7721细胞经缺氧培养3h后,培养上清液中HMGB1含量即见升高,6h后,HMGB1mRNA表达明显增强（P〈O．01）。结论PHCHMGB1表达增强,缺氧为诱导因素。     

大黄对脓毒症大鼠血浆高迁移率族蛋白B1表达的影响

目的 观察大黄对脓毒症大鼠血清中高迁移率族蛋白B1(HMGB1)、肿瘤坏死因子-α(TNF-α)的影响,揭示大黄治疗脓毒症的机制.方法 采用盲肠结扎穿孔术(CLP)制备脓毒症模型,104只雄性SD大鼠随机分为正常对照组(8 只)、CLP组(48只)、大黄治疗组(48只).分别在术后0、3、8、24、48及72 h活杀大鼠留取血标本,采用酶联免疫吸附法测定TNF-α和HMGB-1的含量.结果 大黄治疗组血浆TNF-α水平在8 h,HMGB1水平在24、48及72 h明显低于CLP组, 差异有统计学意义.结论 大黄通过降低血清中TNF-α和HMGB-1的水平,对脓毒症大鼠具有治疗作用.     

氨茶碱和肾上腺素对大鼠心脏停搏的作用

目的探讨不同剂量氨茶碱和肾上腺素在大鼠窒息致心脏停搏模型中的疗效。方法呼气末夹闭气管8min,建立大鼠心脏停搏模型。48只大鼠随机分为氨茶碱和肾上腺素组,比较两组大鼠不同剂量的复苏疗效。结果心电活动恢复率氨茶碱组与肾上腺素组相比,差异无显著性(P>0.05);两组自主循环差异无显著性(P>0.05)。氨茶碱和肾上腺素复苏疗效均与剂量呈正相关。肾上腺素组心脏硬度记分显著高于氨茶碱组,且剂量越大,心脏硬度记分越高。结论在窒息致心脏停搏大鼠模型中,氨茶碱对心电活动和自主循环的恢复与肾上腺素疗效相近;氨茶碱和肾上腺素的复苏疗效与剂量相关;较高剂量肾上腺素容易致“石头心”的发生。     

正丁酸钠对失血性休克大鼠肺部HMGB1 mRNA的调节

目的 研究正丁酸钠(sodium butyrate)对失血性休克大鼠肺部HMGB1 mRNA的影响.方法 由股动脉抽血建立失血性休克模型.30只动物随机分为假手术组、休克复苏组及正丁酸钠治疗组,于复苏后12 h处死动物.检测肺湿/干质量(W/D)比值、支气管肺泡灌洗液(BALF)中中性粒细胞(PMN)百分比和总蛋白浓度;测定肺组织髓过氧化物酶(MPO)活性、丙二醛(MDA)含量; RT-PCR法检测肺组织HMGB1 mRNA表达.结果 正丁酸钠组与休克复苏组相比,肺W/D、BALF中总蛋白含量及PMN百分比显著减少(P<0.05),肺组织MPO和MDA含量、肺组织HMGB1 mRNA表达明显降低(P<0.05).结论 正丁酸钠对失血性休克诱发的肺损伤有保护作用,可能与下调HMGB1 mRNA表达有关.     

肺移植术后血清HMGB1水平的变化及其临床意义

目的探讨血清高迁移率族蛋白B1（HMGB1）水平在肺移植术后的变化和临床意义。方法肺移植21例,其中术后稳定者10例、术后发生急性排斥反应5例、肺部感染6例。采用酶联免疫吸附试验（ELISA）对19名健康者和肺移植患者术前、术后第1、3、7天的血清HMGB1水平进行检测。结果肺移植术后患者血清HMGB1水平明显升高,急性排斥反应组术后第7天血清HMGB1水平明显高于稳定组（P〈0.01）,肺部感染组术后第3天和术后第7天的血清HMGB1水平均明显高于稳定组和急性排斥反应组。健康对照组血清HMGB1水平明显低于肺移植患者术前水平（P〈0.01）。结论肺移植术后血清HMGB1水平升高,血清HMGB1检测对肺移植术后并发症诊断有较好价值。     

休克期切痂对烫伤大鼠肝HMGB1表达及肝功能的影响

目的　探讨休克期切痂对烫伤大鼠肝组织高迁移率族蛋白B1(HMGBl)表达及肝脏功能影响。方法　 30 %Ⅲ度烫伤Wistar大鼠随机分为 2 4h和 72h切痂植皮组。RT PCR和免疫组化染色法检测肝脏HMGBlmRNA/蛋白表达 ,同时检测血浆AST、ALT含量。结果　大鼠烫伤后肝组织HMGB1mRNA表达量增加 1～ 2 5倍 ,2 4h切痂组伤后 8d其水平较烫伤对照和 72h切痂组显著减少 (P <0 0 5 )。烫伤后大鼠肝细胞和枯否细胞HMGB1表达阳性率较正常大鼠均显著升高 (P <0 0 1) ,2 4h切痂组 4、 8dHMGB1表达阳性细胞数较烫伤对照和 72h切痂组均显著减少 (P <0 0 1)。同时 ,烫伤大鼠血浆AST和ALT水平升高 (P<0 0 5 ) ,而 2 4h切痂组伤后 4、 8d较烫伤对照组和 72h切痂组显著降低 (P <0 0 1)。结论　烫伤大鼠休克期切痂能够下调肝组织HMGB1表达 ,局部HMGB1诱生参与了肝损伤的病理生理过程。     

Evolution of somatosensory evoked potentials after cardiac arrest induced hypoxic-ischemic injury

Aim

We tested the hypothesis that early recovery of cortical SEP would be associated with milder hypoxic-ischemic injury and better outcome after resuscitation from CA.

Methods

Sixteen adult male Wistar rats were subjected to asphyxial cardiac arrest. Half underwent 7 min of asphyxia (Group CA7) and half underwent 9 min (Group CA9). Continuous SEPs from median nerve stimulation were recorded from these rats for 4 h immediately following CA, and at 24, 48, and 72 h. Clinical recovery was evaluated using the Neurologic Deficit Scale.

Results

All rats in group CA7 survived to 72 h, while only 50% of rats in group CA9 survived to that time. Mean NDS values in the CA7 group at 24, 48, and 72 h after CA were significantly higher than those of CA9. The N10 (first negative potential at 10 ms) amplitude was significantly lower within 1 h after CA in rats that suffered longer CA durations. SEPs were also analyzed by separating the rats into good (NDS ≥ 50) vs. bad (NDS < 50) outcomes at 72 h, again showing significant difference in N10 and peak-to-peak amplitudes between the two groups. In addition, a smaller N7 potential was consistently observed to recover earlier in all rats.

Conclusions

The diminished recovery of N10 is associated with longer CA times in rats. Higher N10 and peak-to-peak amplitudes during early recovery are associated with better neurologic outcomes. N7, which may represent thalamic activity, recovers much earlier than cortical responses (N10), suggesting failure of thalamocortical conduction during early recovery.     

病毒性心肌炎患儿血清高迁移率蛋白-1和血管内皮细胞钙黏蛋白的变化

目的 探讨病毒性心肌炎患儿血清高迁移率蛋白-1(HMGB1)和血管内皮细胞钙黏蛋白(VE-cadherin)的变化及临床意义.方法 采用ELISA法测定52例病毒性心肌炎患儿血清HMGB1和VE-cadherin含量,同时检测磷酸肌酸激酶同工酶(CK-MB),并与36例健康儿童作对照.结果 病毒性心肌炎患儿血清HMGB1、VE-cadherin和CK-MB急性期含量[HMGB1(5.14±0.23)mg/L;VE-cadherin (5.36±0.92)mg/L;CK-MB(31.42±3.22)U/L]明显高于恢复期[HMGB1(0.92±0.14)mg/L;VE-cadherin(2.93±0.64)mg/L;CK-MB(13.75±3.18)U/L](t值分别为11.37、10.26、12.17,P均＜0.01)及对照组[HMGB1(0.86±0.12)mg/L;VE-cadherin(2.86±0.65)mg/L;CK-MB(12.83±3.04)U/L](t值分别为12.06、11.19、12.64,P均＜0.01);恢复期HMGB1、VE-cadherin和CK-MB水平与对照组比较,差异均无统计学意义(t值分别为1.26、1.19、1.43,P均＞0.05).病毒性心肌炎患儿HMGB1与VE-cadherin、CK-MB呈正相关(r值分别为0.73、0.79,P均＜0.05),VE-cadherin与CK-MB亦呈正相关(r=0.82,P＜0.05).结论 HMGB1和VE-cadherin可能参与病毒性心肌炎的发生发展,并可作为病情判断及预后的观察指标.

Abstract：

Objective To investigate the changes of high mobility group box-1 ( HMGB1 ) and VE-cadherin in serum of children with viral myocarditis and their clinical significance. Methods The serum levels of HMGB1 and VE-cadherin were detected by ELISA in 52 children with viral myocarditis, and 36 normal healthy children were enrolled as control. CK-MB was also measured in all subjects enrolled into the study. Results The serum levels of HMGB1, VE-cadherin and CK-MB in children with acute stage viral myocarditis (HMGB1 :[5.14 ±0. 23] mg/L;VE-cadherin: [5.36 ±0. 92] mg/L;CK-MB: [31.42 ± 3.22] U/L)were significantly higher than those with recovery stage viral myocarditis ( HMGB1: [ 0. 92 ± 0. 14 ] mg/L, VE-cadherin: [2. 93 ±0. 64] mg/L; CK-MB: [ 13.75 ± 3.18 ] U/L) ( t = 11.37,10. 26 and 12. 17 respectively ,Ps ＜ 0. 01 )and control (HMGB1 :[ 0. 86 ± 0. 12 ] mg/L; VE-cadherin: [ 2. 86 ± 0. 65 ] mg/L; CK-MB: [ 12. 83 ±3.04] U/L) (t = 12.06,11.19 and 12. 64 respectively,Ps ＜0.01 ). However,we found no significant difference in the serum levels of HMGB1, VE-cadherin and CK-MB between recovery stage viral myocarditis group and the control ( t = 1.26,1.19,1.43, Ps ＞ 0. 05 ). There were positive correlations between HMGB1 and VE-cadherin,CK-MB (r = 0. 73,0. 79, Ps ＜ 0. 05 ) ;and positive correlation between VE-cadherin and CK-MB (r= 0. 82, P ＜0.05). Conclusion HMGB1 and VE-cadherin may play roles in the viral myocarditis pathogenesis, which can be new prognosis factors for viral myocarditis.     

PEP-1-SOD1 protects brain from ischemic insult following asphyxial cardiac arrest in rats

Aim of the study

Reperfusion following cerebral ischemia leads to excessive production of reactive oxygen species (ROS) and consumption of endogenous antioxidants. Antioxidant enzymes are considered to have beneficial effects against various diseases mediated by ROS. Copper, zinc-superoxide dismutase (SOD1) is one of the major defensive mechanisms by which cells counteract the deleterious effects of ROS after ischemia. However, exogenous SOD1 can not be delivered into living cells because of the poor permeability and selectivity of the cell membrane, thus its application for protecting cells/tissues from oxidative stress damage is greatly limited.

Methods

The purified SOD1 or PEP-1-SOD1 fusion proteins were injected into rats via their tail veins, the transduction ability of PEP-1-SOD1 was examined with immunofluorescent staining and SOD1 activity was measured. Moreover, we determined whether or not PEP-1-SOD1 can protect brain from ischemic injury in an experimental asphyxial cardiac arrest rat model through histopathologic analysis, evaluating the levels of malondialdehyde (MDA), S100β and neuron specific enolase (NSE).

Results

SOD1 protein was observed in PEP-1-SOD1-treated animals and SOD1 activity was significantly increased. However, SOD1 protein was not detected in SOD1-treated animals. The transduced PEP-1-SOD1 significantly attenuated cerebral ischemia-reperfusion damage, inhibited ischemia-induced lipid peroxidation, and protected neurons in hippocampus from the damage induced by transient global ischemic insults.

Conclusions

PEP-1-SOD1 fusion protein can be transduced into the neurons in vivo and protect the neurons from the transient global ischemia-induced damage, suggesting PEP-1-SOD1 may be used for the treatment of oxidative stress-associated disorders such as transient global cerebral ischemia.     

高渗盐对心搏骤停鼠脑复苏的作用

目的研究高渗盐对心搏骤停复苏后脑组织的保护作用及其机制,探讨脑复苏治疗的有效方法。方法大鼠窒息导致心搏骤停模型复制成功后,实验两组于复苏即刻分别静脉注射生理盐水、10%高渗盐,比较两组大鼠复苏前及复苏后各时间点平均动脉压值、自主循环恢复(ROSC)时间、动脉血与脑匀浆丙二醛(MDA)、脑干湿质量比、神经功能缺损评分(NDS)及脑海马组织病理改变。结果两组大鼠复苏前平均动脉压值差异无统计学意义(P>0.05),而复苏后各时间点平均动脉压值高渗盐组均高于对照组(P<0.05);高渗盐组较对照组能显著改善自主循环恢复时间(P<0.01),提高24、48hNDS(P<0.05),减轻大脑湿质量(P<0.01)及减轻脑组织病理损伤;但对1h动脉血MDA及24h脑匀浆MDA无作用。结论静脉注射10%高渗盐能减轻大鼠心搏骤停复苏后脑组织损伤,改善脑功能。     

丙酮酸乙酯对烫伤大鼠肝组织高迁移率族蛋白B1表达和肝功能的影响

目的探讨烫伤大鼠肝组织高迁移率族蛋白B1(HMGB1)表达的变化规律,观察丙酮酸乙酯(EP)对烫伤后肝组织HMGB1表达及肝功能的影响。方法采用大鼠30%总体表面积Ⅲ度烫伤模型,78只雄性Wistar大鼠随机分为假伤组(n=18)、烫伤组(n=30,烫伤后2h腹腔给予林格液3ml)、丙酮酸乙酯(EP)治疗组(n=30,烫伤后2h腹腔给予EP3ml)。3组动物分别于伤后第8、24、72h时点活杀,留取肝组织检测其HMGB1基因/蛋白表达,留取血标本检测肝功能指标。采用逆转录聚合酶链反应及蛋白免疫印记法检测肝组织HMGB1基因/蛋白表达,应用全自动生化分析仪测定血清天冬氨酸转氨酶(AST)和丙氨酸转氨酶(ALT)水平。结果与假伤组比较,严重烫伤组大鼠肝组织HMGB1 mRNA表达及蛋白水平均显著增高(P<0.05或P<0.01),同时血清AST和ALT水平亦显著升高(P<0.05或P<0.01)。EP治疗组大鼠肝组织HMGB1表达显著下调,血清AST和ALT水平不同程度地明显下降(P<0.01或P<0.05)。结论HMGB1参与了烫伤大鼠的炎症反应过程,应用EP治疗可有效抑制烫伤后肝组织HMGB1的表达,并显著减轻烫伤延迟复苏所致肝功能障碍。     

Serum glial fibrillary acidic protein as a predictive biomarker of neurological outcome after cardiac arrest

Aim of the study

Serum glial fibrillary acidic protein (GFAP) has recently been identified as a specific predictor of brain damage and neurological outcome in patients with head trauma. In this study, serum GFAP was assessed as a predictor of neurological outcome in post-cardiac-arrest (PCA) patients.

Methods

This study was a retrospective, single-medical-center analysis, conducted in the intensive care unit of a university hospital. Forty-four sequential PCA patients with cardiogenic or non-cardiogenic arrest were included. The patients were treated with or without therapeutic hypothermia (TH). Serum samples were collected from the patients at 12, 24, and 48 h after the return of spontaneous circulation (ROSC). Serum GFAP concentrations were measured by enzyme-linked immunosorbent assay and compared in patients with good and poor neurological outcomes, evaluated over a period of 6 months using Glasgow Outcome Scale.

Results

Serum GFAP was significantly higher in patients with a poor outcome at 12 and 24 h without TH and at 48 h with TH (P < 0.05). GFAP (>0.1 ng dL⁻¹) was a specific predictor of poor neurological outcome at 6 months with or without TH treatment.

Conclusions

Although this study is preliminary, serum GFAP after ROSC reflected a poor neurological outcome in PCA patients.     

An underrecognized source of organ donors: patients with brain death after successfully resuscitated cardiac arrest

Objective To identify predictors of brain death after successful resuscitation of out-of-hospital cardiac arrest (OHCA), with the goal of improving the detection of brain death, and to evaluate outcomes of solid organs harvested from these patients. Design and setting Prospective observational cohort study in a medical and surgical unit of a nonuniversity hospital. Patients Patients with successfully resuscitated OHCA were prospectively included in a database over a 7-year period. We looked for early predictors of brain death and compared outcomes of organ transplants from these patients to those from patients with brain death due to head injury or stroke. Results Over the 7-year period 246 patients were included. No early predictors of brain death were found. Of the 40 patients (16%) who met criteria for brain death, after a median ICU stay of 2.5 days (IQR 2.0–4.2), 19 donated 52 solid organs (29 kidneys, 14 livers, 7 hearts, and 2 lungs). Outcomes of kidneys and livers did not differ between donors with and without resuscitated cardiac arrest. Conclusions Brain death may occur in about one-sixth of patients after successfully resuscitated OHCA, creating opportunities for organ donation. C. A. received a grant from the publicly funded organization Agence de Biomédecine which manages organ donor data in France.     

Necrostatin-1对创伤失血性休克大鼠肝脏高迁移率族蛋白B1表达的影响

目的 探讨程序性坏死特异性抑制剂-1(necrostatin-1,Nec-1)对创伤失血性休克大鼠肝脏HMGB-1的影响及其机制.方法 采用创伤失血性大鼠休克模型,将96只雄性SD大鼠按随机数字表法随机分为假手术组、DMSO组、Nec-1组,每组32只.假手术组仅进行麻醉、分离血管、结扎血管,并不进行创伤失血和再灌注.DMSO组建立创伤失血性休克大鼠模型,再灌注前5min前股静脉给予DMSO溶剂.Nec-1组于再灌注5 min股静脉给予Nec-1(1 mg/kg).于再灌注后分别在2、8、16、24 h各处死动物8只,取动物血清及肝脏组织.检测血清中丙氨酸氨基转移酶(ALT)、天门冬氨酸氨基转移酶(AST)水平;HE染色观察肝脏病理变化;透射电镜观察再灌注后24h后细胞器水平的细胞坏死;酶联免疫分析法(ELISA)分析血清中HMGB-1含量;蛋白质免疫印迹法(western blotting)分别检测肝脏组织中胞质和总蛋白的HMGB-1含量.结果 Nec-1组与DMSO组比较,血清ALT在8 h(P＜0.05)、16 h(P＜0.01)、24 h(P＜0.01)表达较低,Nec-1组血清AST在8 h(P＜0.01)、16h (P ＜0.01)、24h(P＜0.01)表达较DMSO组低;与DMSO组比较,Nec-1组血清HMGB-1在8 h(P＜0.05)、16 h(P＜0.01)、24h (P＜0.01)有明显下降.光镜及电镜下DMSO组及Nec-1组可见肝小叶结构破坏,淤血,炎性细胞浸润及细胞器损伤,Nec-1组肝组织损伤明显减轻;与DMSO组比较,Nec-1组肝细胞中胞质蛋白HMGB-1在8h (P＜0.01)、16h (P＜0.01)、24 h(P＜0.01)有明显下降,Nec-1组总蛋白HMGB-1在8h (P＜0.05)、24 h(P＜0.05)有明显下降.结论 Nec-1可以有效降低创伤失血性休克对肝脏的损伤,减少HMGB-1的释放,有效保护肝细胞.