氯沙坦通过ERK1/2 MAPK途径抑制高糖诱导小鼠系膜细胞CTGF表达

目的: 研究高糖环境下, 氯沙坦对CTGF的影响以及其作用机制.方法: 体外培养小鼠系膜细胞株(MMCs), 用高糖(25 mmol/L葡萄糖)刺激细胞分别作用24 h、 48 h、 72 h, 用Western blot方法检测磷酸化ERK1/2的表达.再将细胞分为低糖组(5.6 mmol/L葡萄糖), 山梨醇组(5.6 mmol/L葡萄糖+19.4 mmol/L山梨醇), 高糖组(25 mmol/L葡萄糖), 氯沙坦组(25 mmol/L葡萄糖+10-5 mol/L氯沙坦)以及 ERK抑制剂组(25 mmol/L葡萄糖+ 25 μmol/L PD98059), 48 h后采用Western blot方法检测磷酸化ERK1/2的表达, 72 h后采用Real-time PCR方法及Western blot分别检测 CTGF mRNA表达量以及蛋白的表达.结果: 高糖刺激小鼠系膜细胞后, ERK1/2磷酸化的蛋白表达逐渐增高, 呈现一定时间依赖性.与低糖组相比, 高糖组磷酸化ERK1/2、 CTGF的蛋白表达明显增加(P<0.01), 而与高糖组相比, 氯沙坦组以及ERK抑制剂组磷酸化ERK1/2的蛋白表达以及CTGF的蛋白均明显下降有统计学意义(P<0.05).与低糖组相比, 高糖组CTGF mRNA表达量明显增加(P<0.01), 而与高糖组相比, 氯沙坦组以及ERK抑制剂组CTGF mRNA表达量明显下降, 且有统计学意义(P<0.01).结论: 氯沙坦可抑制高糖对CTGF的诱导作用, 其机制可能与抑制ERK1/2 MAPK途径有关.     

SIRT1激活ERK1/2通路抑制大鼠心肌缺血再灌注时内质网应激相关蛋白的表达

目的 研究大鼠心肌缺血再灌注时沉默信息调节因子1(SIRT1)对心肌内质网应激相关凋亡的影响及其与ERK1/2信号通路的关系.方法 将大鼠随机分为6组:假手术组、缺血再灌注组、白藜芦醇+缺血再灌注组、白藜芦醇+ EX527+缺血再灌注组、白藜芦醇+PD98059+缺血再灌注组、PD98059+缺血再灌注组,每组12只.结扎大鼠冠状动脉左前降支建立大鼠心肌I/R损伤模型.TUNEL法检测心肌细胞凋亡;比色法检测LDH、CK-MB活性.实时荧光定量PCR(qRT-PCR)法检测心肌GRP78、caspase-12和CHOP mRNA的表达;Western印迹检测SIRT1、caspase-12、CHOP、磷酸化ERK1/2和总ERK1/2蛋白的表达.结果 Res+ I/R组与I/R组相比,心肌凋亡指数降低(P＜0.05),血清LDH及CK-MB活性降低,内质网应激相关凋亡的指标GRP78、caspase-12及CHOP的蛋白表达量和mRNA均降低(P＜0.05);给予SIRT1抑制剂后与Res+ I/R组相比,以上指标升高;Res+ I/R组与I/R组相比,SIRT1及磷酸化ERK1/2蛋白的表达量均增加(P＜0.05);而Res+ EX+ I/R组与Res+ I/R组相比,SIRT1、磷酸化ERK1/2蛋白的表达量又降低(P＜0.05).结论 SIRT1能够抑制大鼠在体缺血再灌注心肌的内质网应激凋亡相关蛋白表达,发挥保护心肌的作用,其机制可能与ERK1/2通路激活有关.     

吡格列酮上调ERK1/2与Bcl-2在心肌细胞缺血再灌注损伤大鼠心肌细胞的表达

目的研究吡格列酮对ERK1/2与Bcl-2信号转导通路在大鼠心肌缺血再灌注损伤中的作用。方法取半日龄到一日龄Wistar大鼠幼鼠心室肌细胞进行体外培养,并建立缺血再灌注模型。体外培养的细胞分为正常对照组(C组)、缺血再灌注组(I组)、缺血再灌注组+吡格列酮处理组(P组)和P组+ERK1/2抑制剂PD98059处理组(P+Pd组)。采用Western-bloting和免疫细胞化学染色法检测细胞内Bcl-2蛋白的含量。结果 Western-bloting与免疫细胞化学法显示,I组Bcl-2蛋白表达水平高于C组(0.05),P组的Bcl-2蛋白表达高于I组,P+Pd组Bcl-2蛋白表达水平低于P组(0.05)。结论吡格列酮对心肌细胞缺血再灌注损伤的保护可能与下调ERK1/2和Bcl-2转导通路有关。     

Loss of MCL-1 leads to impaired autophagy and rapid development of heart failure

Myeloid cell leukemia-1 (MCL-1) is an anti-apoptotic BCL-2 protein that is up-regulated in several human cancers. MCL-1 is also highly expressed in myocardium, but its function in myocytes has not been investigated. We generated inducible, cardiomyocyte-specific Mcl-1 knockout mice and found that ablation of Mcl-1 in the adult heart led to rapid cardiomyopathy and death. Although MCL-1 is known to inhibit apoptosis, this process was not activated in MCL-1-deficient hearts. Ultrastructural analysis revealed disorganized sarcomeres and swollen mitochondria in myocytes. Mitochondria isolated from MCL-1-deficient hearts exhibited reduced respiration and limited Ca²⁺-mediated swelling, consistent with opening of the mitochondrial permeability transition pore (mPTP). Double-knockout mice lacking MCL-1 and cyclophilin D, an essential regulator of the mPTP, exhibited delayed progression to heart failure and extended survival. Autophagy is normally induced by myocardial stress, but induction of autophagy was impaired in MCL-1-deficient hearts. These data demonstrate that MCL-1 is essential for mitochondrial homeostasis and induction of autophagy in the heart. This study also raises concerns about potential cardiotoxicity for chemotherapeutics that target MCL-1.     

CSF1通过CSF1R/PLCG2/ERK/Nrf2信号通路减少缺氧缺血性脑病大鼠神经元凋亡

目的:探讨集落刺激因子1(CSF1)通过CSF1受体(CSF1R)减轻缺氧缺血性脑病(HIE)大鼠神经元凋亡的下游信号通路.方法:采用原代大鼠皮质神经元建立氧糖剥夺(OGD)神经元损伤模型,重组人CSF1(rh-CSF1)干预该模型,通过CCK-8和MTT检测细胞活力,测定LDH漏出,Western blot检测CSF...     

自噬在缺血性心脏病发病机制中的作用

在心肌缺血再灌注过程中可以通过多种因素诱导细胞的自噬活动,心肌细胞自噬可以保护细胞,减少细胞损失,但是自噬也可导致心肌细胞死亡。     

Akt与ERK1/2在吡格列酮保护乳鼠心肌缺血再灌注损伤中的关系

目的:研究Akt与ERK1/2在吡格列酮保护乳鼠心肌缺血再灌注损伤作用中的关系。方法:体外培养1~3日龄的Wistar乳鼠心室肌细胞,通过缺氧3 h,复氧3 h,建立心肌细胞缺血再灌注损伤模型。实验分为空白对照组(C组)、缺血再灌注组(I/R组)、缺血再灌注+吡格列酮组(I/R+P组)、缺血再灌注+吡格列酮+Akt抑制剂mk2206组(I/R+P+MK组)、缺血再灌注+吡格列酮+ERK1/2抑制剂PD98059组(I/R+P+PD组)。应用免疫印迹和免疫荧光检测各组细胞p-Akt和p-ERK1/2的表达变化。结果:与I/R组比较,I/R+P组p-Akt和p-ERK1/2均增加;I/R+P+MK组的p-Akt显著减少,而p-ERK1/2却明显增加;I/R+P+PD组的p-ERK1/2显著减少,而p-Akt却明显增加。各组间总Akt和ERK1/2的表达无明显变化。结论:吡格列酮可激活Akt和ERK1/2对缺血再灌注的心肌有保护作用,该过程中Akt和ERK1/2相互之间有影响。     

葛根素通过ERK1/2信号通路促进内皮细胞增殖

目的:体外观察葛根素对人脐静脉内皮细胞(HUVEC)的促增殖作用,并对其机制进行初步探讨。方法:采用四甲基偶氮唑蓝(MTT)法检测不同浓度葛根素对HUVEC细胞增殖的影响;流式细胞术检测细胞凋亡;Western blot检测p-ERK1/2蛋白表达水平。结果:葛根素能剂量依赖性促进HUVEC增殖,在80μM效果最明显,且作用36h时,能显著减少早期凋亡,激活ERK1/2磷酸化。结论:葛根素素对人脐静脉内皮细胞有明显的促进增殖作用,其作用可能与ERK1/2的活化有关。     

Adipophilin通过ERK1/2-AP-1途径诱导炎症因子的表达

目的:观察巨噬细胞中脂肪分化相关蛋白(adipophilin)对炎症因子表达的影响,阐明adipophilin促进巨噬细胞炎症因子表达的机制。方法:将已构建成功的adipophilin稳定高、低表达逆转录病毒载体转染入PA317包装细胞,制备adipophilin高和低表达的RAW264.7细胞;收集已转染成功的各组细胞上清液,用ELISA方法检测IL-6、TNF-α、MCP-1等炎症因子在细胞培养液中的浓度。Western blot检测各组细胞AP-1、p-AP-1、ERK1/2及p-ERK1/2的蛋白水平;用ERK1/2抑制剂PD98059或AP-1抑制剂curcumin孵育细胞,检测各组细胞中以上指标的变化情况。结果:高表达adipophilin的细胞上清液中炎症因子IL-6、MCP-1和TNF-α浓度明显增高,adipophilin siRNA组细胞中的炎症因子降低;高表达adipophilin的细胞中p-ERK1/2和p-AP-1的蛋白水平增高,adipophilin siRNA组则减少;ERK1/2抑制剂PD98059使AP-1蛋白活性明显下调;给予AP-1抑制剂curcumin后,细胞培养液中的IL-6、MCP-1和TNF-α浓度明显下降。结论:Adipophilin在RAW264.7巨噬细胞中能够促进炎症因子的表达。     

低氧预适应小鼠脑内ERK1/2磷酸化水平和蛋白表达量的改变

目的：初步探讨细胞外信号调节激酶（Extraeellular signal-regulated kinases，ERK1／2）在脑低氧预适应发生发展过程中的作用。方法：按已建小鼠整体低氧预适应模型，将BALB／C小鼠（18-22g，雌雄不限）随机分为正常对照（H0）、早期（H1-H4）和延迟性（U5-H6）低氧预适应等7组（每组至少6只动物）。应用SDS-PAGE和Western blot等生化技术，并结合Gel Doc凝胶成像系统，半定量检测小鼠脑组织内ERK1／2的磷酸化水平和蛋白表达量。结果：①早期低氧预适应形成过程中，随低氧暴露次数的增加（H1-H4），小鼠海马和皮层组织内ERK1／2磷酸化水平显著降低（P〈0．05，n=6），而ERK1／2蛋白表达量并无显著变化；②延迟性低氧预适应中（H5-H6），小鼠大脑皮层和海马组织内ERK1／2的蛋白表达量显著降低（P〈0．05，n=6）。结论：ERK1／2的活性降低（磷酸化水平降低），以及ERK1／2蛋白表达量下调可能分别参与了脑早期低氧预适应和晚期延迟性低氧预适应的发生发展过程。     

Raf-1 and ERK2 kinases are required for phorbol 12,13-dibutyrate-stimulated proliferation of rat lymphoblasts. ERK2 activation precedes Raf-1 hyperphosphorylation

Rat lymphoblasts are arrested in the G₁ phase of the cell cycle and can be promoted to proceed up to the S phase, when they are stimulated by phorbol ester. In this work, we have studied some details of the phorbol 12,13-dibutyrate (PBu₂)-stimulated proliferation. We show that in response to PBu₂ at least four different protein kinase C (PKC) isoforms translocate to the membrane. A specific PKC ζ antibody recognizes two bands of 75 and 82 kDa. These two activities are separated using a Mono Q chromatography and we show that p75 is the classical PKC ζ isoform, while p82 might be a related isoform which is PBu₂ sensitive. Our data show that there is a correlation between the ability of PBu₂ to promote mitogenesis and to activate ERK2 kinase, suggesting that ERK2 kinase might be the limiting step of the process. We also show that ERK kinase activation precedes Raf-1 kinase hyperphosphorylation, suggesting that Raf-1 kinase activation is not required for ERK kinase activation. This idea was checked using a Raf-1 kinase antisense (AS) oligonucleotide. The results obtained with the Raf-1 AS oligonucleotide indicate that this serine/threonine kinase is dispensable for ERK kinase activation, but needed for the PBu₂ mitogenic signaling even as late as 7 h after the delivery of the signal.     

肿瘤坏死因子α调控ERK1/2信号通路促进长骨骨样细胞凋亡

文题释义：肿瘤坏死因子α：是一种主要由巨噬细胞和单核细胞产生的促炎细胞因子,并参与正常炎症反应和免疫反应。MAPK信号通路：生物体内重要的信号转导系统之一,参与介导细胞生长、发育、分裂和分化等多种生理及病理过程,ERK是MAPK通路中极其重要的组成部分之一。激活的ERK1/2通过核转位进入细胞核,激活其下游的相关转录因子或激活胞质和胞核激酶等调控细胞的生存、增殖和分化。背景：肿瘤坏死因子α作为促炎因子可诱导成骨细胞凋亡,增强破骨细胞功能,从而造成炎症性骨破坏,但是其作用机制尚不明确。 目的：探讨炎症因子肿瘤坏死因子α对长骨骨样细胞MLO-Y4增殖、凋亡的影响及可能机制。方法：将MLO-Y4细胞分为对照组、肿瘤坏死因子α组、ERK1/2抑制剂组。肿瘤坏死因子α组用含50 μg/L肿瘤坏死因子α的α-MEM完全培养基孵育24 h,ERK1/2抑制剂组用含50 μmol/L PD98059的α-MEM完全培养基孵育24 h,对照组单纯采用α-MEM完全培养基孵育24 h,采用MTT法检测细胞增殖能力,流式细胞术检测细胞凋亡情况,丙二醛、超氧化物歧化酶、谷胱甘肽过氧化物酶试剂盒检测细胞氧化应激水平,用Western blot法测定PCNA、cleaved caspase-3、p-ERK1/2、ERK1/2的蛋白水平。结果与结论：①与对照组相比,50 μg/L肿瘤坏死因子α处理24 h后,细胞增殖能力下降,凋亡率上升;细胞脂质过氧化物丙二醛水平显著增加,而抗氧化物酶超氧化物歧化酶和谷胱甘肽过氧化物酶活性显著降低;②与对照组相比,肿瘤坏死因子α组细胞增殖相关蛋白PCNA的表达显著降低,细胞凋亡相关蛋白cleaved caspase-3的表达显著升高,p-ERK1/2的表达降低,而总蛋白ERK1/2的表达基本保持不变。ERK1/2抑制剂组上述指标与肿瘤坏死因子α组无显著差异;③结果表明,50 μg/L肿瘤坏死因子α可使长骨骨样细胞MLO-Y4增殖能力下降,细胞凋亡增多,其作用机制可能与抑制MAPK-ERK1/2信号通路的活化有关。ORCID: 0000-0003-0863-8618(史方富)中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

PI3K/Akt and ERK1/2 signalling pathways are involved in endometrial cell migration induced by 17beta-estradiol and growth factors

Cell motility and invasion are crucial events for endometrial cells, not only for the establishment of pathological states but also during the physiological tissue remodelling that occurs during the menstrual cycle and embryo implantation. We have characterized these phenomena in endometrial stromal cells evaluating cell migration-specific stimuli and the biochemical pathways involved. Ability of endometrial cells to migrate on collagen type IV substrate was evaluated by means of chemotaxis experiments. Modulation of this phenomenon by different growth factors and steroid hormones and their ability to activate extracellular signal-regulated protein kinase (ERK) and phosphatidylinositol 3 kinase (PI3K)/Akt signalling in this context were examined. Platelet-derived growth factor (PDGF)-BB, epidermal growth factor and fibroblast growth factor-2 as chemoattractant agents stimulated basal migration of endometrial stromal cells through the rapid activation of both ERK1/2 and PI3K/Akt signalling pathways. Experiments using wortmannin and PD98059, specific inhibitors of the PI3K/Akt and ERK1/2 activity, respectively, showed that the activation of both pathways is required for growth-factor-induced cell motility responses. Similarly, 17beta-estradiol (10(-6)-10(-8) M) could enhance both constitutive and PDGF-induced migration of the cells and their rapid treatment with the hormone significantly increased phosphorylation of ERK1/2 and Akt. Conversely, progesterone did not interfere with the basal migration but inhibits the PDGF-induced motility of this cell type. Rapid activation of intracellular signalling cascades ERK1/2 and PI3K/Akt by growth factors and estrogens is involved in the migration of normal endometrial stromal cells.     

Synergistic effects of snail and quercetin on renal cell carcinoma Caki-2 by altering AKT/mTOR/ERK1/2 signaling pathways

Renal cell carcinoma has become the most common subtype of kidney cancer, and has the highest propensity to manifest as metastatic disease. Because of lack of knowledge in events that correlated with tumor cell migration and invasion, few therapeutic options are available. Therefore, in current study, we explore the anti-tumoral effect of a potential chemopreventive natural product, quercetin, combined with anti-sense oligo gene therapy (inhibiting Snail gene). We found that either one of them had the remarkable effects in suppressing cell proliferation and migration, inducing cell cycle arrest and apoptosis in a ccRCC cell line, Caki-2 cells. The combination of both means provides even strong suppressive effects toward these ccRCC cells. Our study, for the first time, provides the possibility of using a novel treatment for renal cancer, by combining natural product and gene therapy.     

Epiregulin induces human SK-N-BE cell differentiation through ERK1/2 signaling pathway

Abstract

Epidermal growth factor (EGF) and other EGF-related growth factors, such as transforming growth factor-α, are able to stimulate neuroblastoma (NB) cell proliferation. Epiregulin (Epi) is a growth factor belonging to the EGF family known to be more potent than EGF in mediating mitogenic signals. In this study, we tested the ability of Epi to stimulate a human NB cell line (SK-N-BE) proliferation. Surprisingly, Epi (50–1000?ng/ml) induced a reduction in SK-N-BE proliferation along with a morphological differentiation, associated with an increase in MMP-9 expression. Moreover, Epi-induced differentiation was inhibited by ERK1/2 phosphorilation inhibition. In conclusion, Epi could represent a novel and useful tool to oppose NB cell proliferation.     

Noonan syndrome-associated SHP2/PTPN11 mutants cause EGF-dependent prolonged GAB1 binding and sustained ERK2/MAPK1 activation

Noonan syndrome is a developmental disorder with dysmorphic facies, short stature, cardiac defects, and skeletal anomalies, which can be caused by missense PTPN11 mutations. PTPN11 encodes Src homology 2 domain-containing tyrosine phosphatase 2 (SHP2 or SHP-2), a protein tyrosine phosphatase that acts in signal transduction downstream to growth factor, hormone, and cytokine receptors. We compared the functional effects of three Noonan syndrome-causative PTPN11 mutations on SHP2's phosphatase activity, interaction with a binding partner, and signal transduction. All SHP2 mutants had significantly increased basal phosphatase activity compared to wild type, but that activity varied significantly between mutants and was further increased after epidermal growth factor stimulation. Cells expressing SHP2 mutants had prolonged extracellular signal-regulated kinase 2 activation, which was ligand-dependent. Binding of SHP2 mutants to Grb2-associated binder-1 was increased and sustained, and tyrosine phosphorylation of both proteins was prolonged. Coexpression of Grb2-associated binder-1-FF, which lacks SHP2 binding motifs, blocked the epidermal growth factor-mediated increase in SHP2's phosphatase activity and resulted in a dramatic reduction of extracellular signal-regulated kinase 2 activation. Taken together, these results document that Noonan syndrome-associated PTPN11 mutations increase SHP2's basal phosphatase activity, with greater activation when residues directly involved in binding at the interface between the N-terminal Src homology 2 and protein tyrosine phosphatase domains are altered. The SHP2 mutants prolonged signal flux through the RAS/mitogen-activated protein kinase (ERK2/MAPK1) pathway in a ligand-dependent manner that required docking through Grb2-associated binder-1 (GAB1), leading to increased cell proliferation.     

血管紧张素II通过细胞外信号调节激酶1/2通路调控过氧化氢酶的表达及促进成纤维细胞表型转化*

 目的： 探讨细胞外信号调节激酶1/2(ERK1/2)在高血压大鼠模型动脉外膜血管重塑中的作用。方法: 利用血管紧张素II (Ang II)微泵灌注制备高血压大鼠模型,随机分为未处理组、生理盐水灌注组和Ang II灌注组。分别检测各组大鼠尾动脉收缩压及血管形态学改变;Western blotting技术检测外膜成纤维细胞过氧化氢酶(CAT)蛋白在未处理组、单纯Ang II、ERK1/2抑制剂PD98059和Ang II+PD98059培养下的表达。结果: 大鼠颈动脉HE染色和收缩压结果显示,与未处理组及生理盐水灌注组相比,Ang II组大鼠颈动脉中膜厚度和收缩压明显增加(P<0.01),动脉形态结构有明显改变,并且有显著的病理性血管重塑发生。Western blotting检测结果显示,PD98059作用下CAT比单纯Ang II明显增高(P<0.05),表明ERK1/2信号通路能够恢复Ang II诱导的CAT表达下调。结论: Ang II可能通过ERK1/2信号通路下调血管外膜CAT的表达,进而促进血管细胞表型转化,导致血管病理性重塑发生。     

低氧诱导肌成纤维细胞生成并通过ERK1/2途径促进Ⅰ型胶原的表达

目的：探讨低氧能否激活成纤维细胞转化为肌成纤维细胞,以及低氧环境对肾皮质肌成纤维细胞表达Ⅰ型胶原（Col-Ⅰ）的影响及其可能的信号通路。方法：（1）采用正常大鼠肾成纤维细胞系（NRK-49F），应用Western blotting方法检测低氧诱导因子-1α(HIF-1α)的表达;比较低氧和正常氧条件下α-平滑肌肌动蛋白(α-SMA)的蛋白水平。（2）原代培养正常大鼠肾皮质肌成纤维细胞，Western blotting方法检测低氧和正常氧条件下，HIF-1α和Ⅰ型胶原蛋白水平以及ERK1/2的活化及其特异阻断剂 PD98059的阻断效应；RT-PCR方法检测Ⅰ型胶原mRNA表达水平；细胞免疫化学法检测HIF-1α胞内表达部位的变化；明胶酶谱法检测细胞上清中基质金属蛋白酶-2（MMP-2）和基质金属蛋白酶-9（MMP -9）的活性。结果：（1）低氧刺激6 h，NRK-49F细胞和肌成纤维细胞胞内和核内均有HIF-1α蛋白表达，核内更明显。（2）低氧培养12 h,NRK-49F细胞表达α-SMA蛋白明显增高，是正常氧组的187%±32%（P<0.05），验证了低氧可引起成纤维细胞表型转化。（3）低氧刺激原代培养的正常大鼠肾皮质肌成纤维细胞6 h、12 h上清中Ⅰ型胶原蛋白水平增加，分别为正常氧组的171%±27%（P<0.05）和256%±61% （P<0.05）；低氧刺激4 h、6 h，Ⅰ型胶原mRNA表达增加，为正常氧组的189%±28%（P<0.05）和221%±44%（P<0.05）。（4）低氧刺激肌成纤维细胞6 h、12 h、24 h，培养上清液中MMP-9、MMP-2活性无明显变化。（5）低氧刺激肌成纤维细胞15 min 即可使ERK1/2活化，阻断实验显示，PD98059可以使低氧12 h引起Ⅰ型胶原增加（低氧刺激组为正常氧对照组的273%±51%，P<0.05)显著减少（PD98059 +低氧组为正常氧组的108%±19%，P>0.05)。结论： 低氧促肾纤维化可能与其诱导肾成纤维细胞转化为肌成纤维细胞并经ERK1/2途径增加Ⅰ型胶原蛋白的表达有关。     

Edaravone对大鼠弥漫性脑创伤后ERK1/2通路的影响

为探讨Edaravone对脑创伤的保护机制,本研究观察了Edaravone对弥漫性脑创伤大鼠脑组织磷酸化细胞外信号调节激酶ERK1/2表达变化的影响。114只雄性SD大鼠,随机分为3组:(1)假手术对照组(A组,n=18),(2)创伤组(B组,n=48),(3)Edaravone治疗组(C组,n=48),采用Marmarou’s法建立大鼠弥漫性颅脑损伤模型。伤后1、3、6、24、48和72h,HE染色观察伤后皮质和海马区神经细胞组织形态变化,Western blot法、免疫组化法检测皮质和海马区p-ERK1/2的表达,术后24、48、72h对大鼠神经运动功能和综合运动能力评分。结果显示:光镜下,伤后6、24h即可见B组大脑皮质和海马区神经细胞胞体收缩呈三角形,胞浆嗜色性减弱,核皱缩浓染,细胞周围出现空隙,即神经细胞变性坏死改变,C组上述改变明显减轻;免疫组化与Western blot法结果显示,与A组比较,B组ERK1/2(即p-ERK1/2)活性在伤后1、3、6、24、48h显著增高(P<0.05);与B组比较,C组中p-ERK1/2在6、24及48h显著回降(P<0.05);神经功能与综合运动能力评分在B组中(8.73±1.4,63.8±27.7)明显低于A组(24.00±0.00,278.4±27.7),C组(17.36±1.63,117.6±20.9)显著回升(P<0.05)。本研究表明Edaravone可改善脑创伤后神经功能损伤,其机制与调节脑创伤后ERK1/2信号活化水平有关。