HMGB1在心肌缺血再灌注损伤中作用的研究进展

高迁移率族蛋白1(HMGB1)是一种核蛋白,几乎存在于所有细胞的细胞核中,可调节染色质结构、DNA复制和基因转录等.它对细胞正常发育起到至关重要的作用.当HMGB1作为一种损伤相关分子模式从细胞内向外释放时,在介导炎症反应中扮演重要角色.心肌缺血再灌注损伤是一种多种细胞及细胞因子参与的病理生理过程,涉及的信号分子及通路...     

大鼠心肌梗死后心肌高迁移率族蛋白HMGB1的时程变化

目的 探讨大鼠心肌梗死模型后不同时间高迁移率族蛋白(HMGB1)的时程变化.方法 结扎SD大鼠左冠状动脉前降支造成左室大面积心梗,分别于术后1、2、4、8周测心功能判断造模是否成功后开胸取心脏.分别运用实时荧光定量PCR和Western蛋白印迹技术观察心肌梗死后不同时间点HMGB1在mRNA和蛋白水平的表达变化.结果 心功能检测提示造模成功,心梗大鼠术后早期(1 w)HMGB1 mRNA表达上调(P＜0.01),而心梗后期(8周)则表达显著减少(P＜0.01).与mRNA水平变化类似,HMGB1蛋白水平在心肌梗死组大鼠术后早期(1～2周)表达水平增加(P＜0.01),而心梗后期(8周)则显著下调(P＜0.05).结论 HMGB1作为炎症调节因子,在心梗早期对心肌的炎性反应进行调控;并在心梗后期参与调节基因转录,进行心肌修复.在心梗的不同阶段对HMGB1的表达进行干预有望减少心梗并发症,改善预后.提高患者长期存活率.     

沉默INHBA-AS1靶向miR-335-3p抑制外阴鳞状细胞癌细胞增殖、迁移

目的:探讨沉默长链非编码RNA（long non-coding RNA,lncRNA）INHBA反义RNA1（INHBA antisense RNA1,INHBA-AS1）对外阴鳞状细胞癌细胞SW954生物学行为的影响及机制。方法:37例外阴鳞状细胞癌组织中INHBA-AS1、miR-335-3p表达运用qRT-PCR检测,高迁移率族蛋白2（high mobility group AT-hook 2,HMGA2）蛋白的表达运用Western blotting检测。实验分为con组、si-NC组、si-INHBA-AS1组、miR-NC组、miR-335-3p mimic组、si-INHBA-AS1+miR-335-3p inhibitor组。应用CCK-8实验检测SW954细胞增殖抑制率,克隆形成实验检测SW954细胞克隆形成,Transwell实验和划痕实验检测SW954细胞迁移,流式细胞术检测SW954细胞凋亡。双荧光素酶报告实验鉴定INHBA-AS1与miR-335-3p、miR-335-3p与HMGA2的靶向关系。结果:外阴鳞状细胞癌组织中INHBA-AS1、HMGA2蛋白的表达水平远高于癌旁组织,miR-335-3p的表达水平低于癌旁组织（P＜0.05）。转染si-INHBA-AS1沉默INHBA-AS1或转染miR-335-3p mimic过表达miR-335-3p后,miR-335-3p表达水平、SW954细胞抑制率及凋亡率升高,HMGA2蛋白的表达水平、SW954细胞克隆形成数、迁移细胞数及划痕愈合率降低（P＜0.05）。INHBA-AS1靶向miR-335-3p,miR-335-3p靶向HMGA2。沉默INHBA-AS1处理的SW954细胞增殖、迁移、凋亡的影响被抑制miR-335-3p所逆转。结论:沉默外阴鳞状细胞癌细胞SW954中的INHBA-AS1通过miR-335-3p靶向HMGA2,抑制SW954细胞增殖、迁移,并诱导其凋亡。     

HMGB-1基因及其受体RAGE在宫颈鳞癌中的表达及临床意义

目的:检测高迁移率族蛋白-1(HMGB-1) mRNA和晚期糖基化终产物受体(RAGE) mRNA在宫颈鳞癌(CSEC)组织中的表达及其与临床病理参数间的关系,探讨它们与CSEC发生、侵袭和转移的关系。方法:采用实时荧光定量PCR(qRT-PCR)检测CSEC、癌旁及正常宫颈组织中HMGB-1 mRNA和RAGE mRNA的表达情况。结果:(1)HMGB-1 mRNA在CSES、癌旁组织表达水平均高于正常宫颈组织(P<0.05)。其表达与肿瘤分期、淋巴转移明显相关(P<0.05),而与肿瘤直径、分级无关(P>0.05)。(2)RAGE mRNA在CSES、癌旁及正常的宫颈组织中的表达水平无明显的统计差异(P>0.05),其表达与肿瘤直径、分级、分期无关(P>0.05),仅与淋巴转移相关(P<0.05)。结论:HMGB-1可作为判断宫颈肿瘤侵袭、转移的生物指标,RAGE与CSEC转移相关,HMGB-1/RAGE可能是促进CSEC转移发生的重要信号通路,它们将有可能成为治疗宫颈癌淋巴转移的新靶点。     

Effect of lead on electrophoretic mobility of rat erythrocytes

Lead often affects the erythrocyte membrane. The relationship between the changes in erythrocyte membrane and the anemia caused by lead is still unclear. Initially, the effect of lead injected intraperitoneally on the electrophoretic mobility of rat erythrocytes was investigated in order to study the relationship between them. As indices of lead exposure, hemoglobin (Hb) levels, hematocrits (Ht), δ-aminolevulinic acid dehydratase (ALA-D) activities and blood lead (blood Pb) levels in the injected rats were also examined. Exposure to lead significantly decreased the mobility of rat erythrocytes. The changes in mobility seemed to be less sensitive than those in ALA-D activity, however, the decreases in mobility were simultaneous with or prior to those in Hb level and Ht. The decreases in mobility were evident to some extent below a blood Pb level of 100 μg/100 ml and generally present at a level of 100 μg/100 ml and over. In the rats exposed to lead a significant negative correlation was found between the mobilities and the logarithms of blood Pb level.     

Monitoring of Ion Mobility in the Cement Matrix to Establish Sensitivity to the ASR Caused by External Sources

The possibility of the formation of an alkali–silicate reaction (ASR) is a crucial issue for the service life of concrete. The coexistence of key parameters such as the presence of alkalis, reactive SiO₂, humidity, and temperature predetermine the possibility of its formation and application. When an ASR gel forms, it results in the concreting cracking and spalling as well as in the deterioration of its overall properties. The risk of ASR depends on the concentration of alkalis and their mobility, which influence their ability to penetrate the concrete. The objective of this study was to determine the ionic mobility of not only Na⁺ and K⁺, but Ca²⁺ as well, from external sources (0.5 and 1.0 mol/L solutions of Na/K carbonate, nitrate, and hydroxide) to a cementitious matrix as the precursor for ASR. The concentrations of ions in both the immersion solutions (ICP) and the cementitious matrix itself (SEM-EDX) were studied as a function of time, from 0 to 120 days, for leaching, and according to temperature (25 and 40 °C). The reaction products were characterized using SEM-EDX. Different diffusion rates and behavior were observed depending on the anion type of the external alkali source. Both sodium and potassium ions in all the three environments studied, namely carbonate, hydroxide, and nitrate, penetrated into the composite and further into its structure by different mechanisms. The action of hydroxides, in particular, transformed the original hydration products into calcium-silicate-hydrate (CASH) or ASR gel, while nitrates crystallized in pores and did not cause any changes in the hydration product. The driving force was the increased temperature of the experiment as well as the increased concentration of the solution to which the test specimen was exposed.     

运动对预防老年人跌倒效果的网状Meta分析

目的 系统评价运动对预防老年人跌倒的疗效.方法 检索1980年至2020年7月Web of Science、PubMed、Cochrane Library、中国知网数据库有关运动对预防老年人跌倒的随机对照试验,采用Review Manager 5.3对纳入文献进行质量评价,应用R-Studio和Addis 1.16.6...     

妊高症患者及新生儿脐血VE-cadherin和HMGB1的检测

目的分析妊高症患者及新生儿脐血血清血管内皮细胞钙黏蛋白（VE-cadherin）和高迁移率蛋白-1（HMGB1）的变化。方法采用酶联免疫吸附法（ELISA）测定98例妊高症患者（包括妊娠期高血压40例、轻度子痫前期30例和重度子痫前期28例）及30例正常对照组产妇及新生儿脐血血清VE-cadherin和HMGB1含量。结果VE-cad herin和HMGB1在妊高症组及正常对照组及新生儿脐血血清中均有表达,VE-cadherin在三组妊高症病患者血清中含量与正常对照组比较,差异有显著意义（t=5.83,8.41,9.04,P均〈0.05）。随着病情越严重,VE-cadherin水平越高,三组之间差异有统计学意义（t=6.23,8.56,P均〈0.05）;HMGB1与VE-cadherin分布高度一致,并呈正相关（r=0.59,P〈0.01）。VE-cadherin和HMGB1在妊高症各组新生儿脐血中的含量,差异无统计学意义（P〉0.05）。结论VE-cadherin和HMGB1的高表达,显示妊高症病患者内皮细胞损伤,是妊高症内皮损伤炎症标记物,为妊高症的治疗和预防开辟一条新途径     

改良EMSA法分析人α1(Ⅰ)胶原基因序列特异性DNA结合蛋白

目的：分析人α１（Ⅰ）胶原基因５‘侧翼区具有较高启动调控活性序列的ＤＮＡ结合蛋白。方法：以原代培养人瘢痕皮肤成纤维细胞为胶原产生细胞,采用限制性内切酶消化,ＤＮＡ混合片段末端标记和增强化学发光的改良电泳迁移率改变实验（ＥＭＳＡ）分析人α１（Ⅰ）胶原基因－２６８￣＋４２ｂｐ序列的ＤＮＡ结合蛋白,其结合活性具有特异性,并能被ｓｐ－１,ＮＦ－１,ＮＦ－ｋＢ识别序列中存在α１（Ⅰ）胶原基因－２６８￣＋４２     

DACT1对Ⅰ型卵巢癌恶性侵袭行为的影响

目的 探讨β-环连蛋白抑制基因1(dapper antagonist of catenin-1,DACT1)对Ⅰ型上皮性卵巢癌迁移侵袭能力的影响及可能机制.方法 免疫组织化学检测Ⅰ型人卵巢癌临床组织中DACT1的表达;采用人黏液性卵巢癌细胞株3AO构建外源性转染DACT1的稳转株,通过划痕实验、Transwell迁移及基质胶侵袭实验检测细胞运动能力;免疫荧光观察DACT1对细胞骨架重塑的影响.结果 Ⅰ型卵巢癌组织中DACT1表达低于正常卵巢组织(P＜0.01).外源性转染DACT1后3AO细胞株迁移侵袭能力降低(P＜0.01),且腹腔内成瘤能力有所下降,细胞骨架中特化膜结构减少.结论 DACT1对Ⅰ型卵巢癌浸润转移具有抑制效应,其在Ⅰ型卵巢癌组织中的低表达可能与其疾病发生相关.