阿托伐他汀对2型糖尿病大鼠心肌GRP78和CHOP表达的影响

探讨阿托伐他汀对2型糖尿病大鼠心肌组织内质网应激相关因子CCAAT/增强子结合蛋白同源蛋白（CHOP）和葡萄糖调节蛋白78（GRP78）表达的影响。将Wistar大鼠随机分为正常对照组（NC组）、糖尿病心肌病模型组（DCM组）和阿托伐他汀治疗组（DCM+Ato组）。采取高脂肪饲料喂养加一次性腹腔注射链脲佐菌素的方式制备2型糖尿病心肌病大鼠模型,DCM+Ato组大鼠予阿托伐他汀干预8周。采用左室插管评估大鼠心功能,HE染色观察心肌组织病理学改变,TUNEL法测定心肌细胞凋亡水平,Western blot检测心肌组织的GRP78和CHOP蛋白表达量。DCM组较NC组细胞肥大,排列紊乱,形态不规则,DCM+Ato组较DCM组改善。与NC组比较,DCM组左室舒张末期压（LVEDP）显著升高,左室收缩压（LVSP）和左室压力上升或下降最大速率（LV±dp/dt max）显著降低,细胞凋亡率升高,GRP78、CHOP表达明显升高（P＜0.05）;与DCM组比较,DCM+Ato组LVEDP显著降低,LVSP和LV±dp/dt max显著升高,细胞凋亡率降低,GRP78、CHOP表达明显下降（P＜0.05）。阿托伐他汀能有效减轻2型糖尿病大鼠的心肌病理损伤及改善心功能,可能与下调内质网应激相关因子GRP78、CHOP的表达,减少心肌细胞凋亡有关。     

银杏叶提取物对肝纤维化大鼠肝组织GRP78及CHOP表达的影响

目的：观察银杏叶提取物（GbE）对肝纤维大鼠内质网应激通路相关分子GRP78、CHOP表达的影响,探讨GbE抗肝纤维的作用机制。方法：采用40％的CCl4皮下注射（3mL.Kg-1.d-1,2次/周,首剂加倍） 6周诱导大鼠肝纤维化模型,同时分别以200、100、50mg.Kg-1.d-1的GbE灌胃干预6周,空腹取肝组织,RealTime-PCR及免疫组化法分别检测肝组织GRP78及CHOP基因的mRNA及蛋白表达。结果：肝组织GRP78和CHOP的mRNA及蛋白的表达较正常组明显增加（P〈0.05 P〈0.01）;应用高、中、低剂量GbE干预后,大鼠肝组织GRP78和CHOP基因的mRNA及蛋白表达显著下降（P〈0.05 P〈0.01）。结论：肝纤维化大鼠肝脏发生了ERS反应,GbE下调肝纤维化大鼠肝组织内质网应激通路相关分子GRP78和CHOP的mRNA及蛋白的表达可能是其抗肝纤维化作用的机制之一。     

GRP78在胃癌、慢性萎缩性胃炎及浅表性胃炎组织中的表达及临床意义

目的研究葡萄糖调节蛋白78（GRP78）在胃癌、慢性萎缩性胃炎及浅表性胃炎组织中的表达及临床意义。方法 RT‐PCR法检测胃癌、慢性萎缩性胃炎和浅表性胃炎各25例新鲜组织中GRP78基因表达;免疫组化法检测胃癌、慢性萎缩性胃炎和浅表性胃炎各60例组织中GRP78蛋白表达。分析GRP78蛋白表达与临床病理参数间的相关性。结果胃癌组织中GRP78 mRNA的表达水平高于慢性萎缩性胃炎和浅表性胃炎（1.26±0.18 vs ．0.89±0.25和0.29±0.09）（ P＜0．01）。胃癌组织中GRP78蛋白的阳性表达率亦高于慢性萎缩性胃炎和浅表性胃炎（78.3％ vs ．46.6％和6.7％）（P＜0．01）。胃癌组织中GRP78蛋白表达与胃癌分化程度、分期、淋巴结转移等明显相关（P＜0．05或P＜0．01）。结论 GRP78在胃癌中呈高表达;检测GRP78的表达可能有助于预防及早期诊断胃癌。     

姜黄素联合黄芩苷对乙醇诱导大鼠肝细胞凋亡的干预作用研究

目的探讨姜黄素和黄芩苷对乙醇诱导大鼠肝细胞凋亡的保护作用及其潜在机制。方法 50只健康雄性Wistar大鼠随机分为正常对照组、乙醇模型组(50%v/v)、姜黄素干预组(50 mg/kg·bw)、黄芩苷干预组(50 mg/kg·bw)及姜黄素和黄芩苷联合干预组。TUNEL染色观察大鼠肝细胞凋亡情况,RT-qPCR检测大鼠肝CHOP、GRP78、ASK1、MKK3、Caspase-3和Caspase-12的mRNA表达水平,Western blot检测大鼠肝CHOP、GRP78、ASK1、p-ASK1、MKK3、p-MKK3、Caspase-3和Caspase-12的蛋白表达水平。结果与对照组相比,乙醇模型组肝组织TUNEL阳性细胞数、CHOP、GRP78、Caspase-3和Caspase-12的mRNA表达水平及CHOP、GRP78、p-ASK1、p-MKK3、Caspase-3和Caspase-12的蛋白表达水平均上调(P0.05)。联合干预组TUNEL阳性细胞数、CHOP、GRP78、p-MKK3、Caspase-3和Caspase-12的蛋白表达水平均低于乙醇模型组及姜黄素和黄芩苷单独干预组(P0.05),CHOP和GRP78的mRNA表达水平低于乙醇模型组(P0.05),p-ASK1水平和Caspase-3 mRNA表达水平低于乙醇模型组和姜黄素干预组(P0.05),Caspase-12 mRNA表达水平低于乙醇模型组和黄芩苷干预组(P0.05)。此外,姜黄素和黄芩苷联用对GRP78和Caspase-3 mRNA表达及p-ASK1/ASK1和p-MKK3/MKK3的比值存在协同交互作用,差异均有统计学意义(P0.05)。结论姜黄素和黄芩苷可能通过抑制内质网应激凋亡通路而减轻乙醇诱导的大鼠肝细胞过度凋亡。     

淫羊藿苷对脂多糖诱导成骨细胞凋亡及GRP78/PERK/CHOP通路的影响

摘 要 目的：探讨淫羊藿苷（ICA）对脂多糖（LPS）诱导成骨细胞凋亡及葡萄糖调节蛋白78/蛋白激酶R样内质网激酶/C/EBP同源蛋白（GRP78/PERK/CHOP）通路的影响。 方法: 采用大鼠骨髓基质干细胞定向诱导分化为成骨细胞的方法,将成骨细胞随机分成5组：对照组（只含成骨细胞）、LPS组（成骨细胞中加入终浓度为500 ng·ml-1 LPS）、ICA低、中、高剂量组（分别在LPS组基础上加入终浓度为1,10,100 μmol·L-1 ICA）。采用CCK 8法检测细胞增殖情况,采用对硝基苯棕榈酸酯（PNPP）法检测成骨细胞碱性磷酸酶（AKP）活性的变化情况,采用ELISA法检测成骨细胞Ⅰ型胶原蛋白表达情况,采用AnnexinV/PI双染法流式细胞术检测细胞凋亡情况,采用Western blot检测凋亡及GRP78/PERK/CHOP通路相关蛋白表达情况。 结果: 骨髓基质干细胞经定向诱导后,符合成骨细胞形态学表现,AKP染色呈阳性反应,Ⅰ型胶原蛋白免疫组织化学染色结果显示：细胞质染色呈棕黄色;与对照组相比,LPS组细胞48 h时的吸光度（A）值、AKP活性、Ⅰ型胶原蛋白和B淋巴细胞瘤 2基因（Bcl 2）蛋白表达水平显著降低（P＜0.05）,细胞凋亡率、活化的天冬氨酸特异性半胱氨酸蛋白酶 3（cleaved caspase 3）、Bax、GRP78、磷酸化的PERK（p PERK）、磷酸化α亚基的真核起始因子2（p eIF2α）、CHOP蛋白表达水平显著升高（P＜0.05）;与LPS组相比,ICA各剂量组细胞48 h时的A值、AKP活性、Ⅰ型胶原蛋白和Bcl 2蛋白表达水平显著升高（P＜0.05）,细胞凋亡率、cleaved caspase 3、Bax、GRP78、p PERK、p eIF2α、CHOP蛋白表达水平显著降低（P＜0.05）,且呈剂量依赖性（P＜0.05）。     

快速动眼睡眠剥夺后GRP78、GRP94在大鼠大脑皮质、海马及延髓中的表达

目的研究不同时间快速动眼(REM)睡眠剥夺对大鼠皮质、海马及延髓葡萄糖调控蛋白(glucose-regulated protein,GRP)表达的影响。方法大鼠随机分为睡眠剥夺1、3、5、7d(SD 1 d,SD 3d,SO 5d,SD 7d,n=10)组、剥夺7d后恢复睡眠6、12h(SD 7d/RS 6h,SD 7d/RS 12h,n= 10)组、环境对照(TC,n=10)组和空白对照(CC,n=10)组。采用改良多平台睡眠剥夺法进行不同时间REM睡眠剥夺。应用免疫组织化学方法及半定量逆转录-聚合酶链反应(RT-PCR)技术检测脑组织标本中GRP78、GRP94表达分布规律及时空的变化。结果睡眠剥夺d1皮质、海马区GRP78、GRP94蛋白表达增多(与TC、CC组比较,P<0.05),d 3达高峰,d 5、7与TC、CC组比较无显著差异(P>0.05);延髓区无明显改变;恢复睡眠后只有延髓区GRP94表达增加。RT-PCR显示睡眠剥夺l d GRP78转录增加,d 3达峰值,d 5、7转录无增加;GRP94转录在剥夺期间无增加;恢复睡眠后GRP78、GRP94 mRNA增加。睡眠剥夺d 3 GRP蛋白表达改变皮质区最为明显(P<0.01),其次为海马区(P<0.05)。结论短时间睡眠剥夺后GRP78、GRP94表达渐升高,可能是内质网启动了自身稳定调节的保护功能;长时间睡眠剥夺导致内质网功能障碍,GRP78、GRP94表达下降。皮质区对睡眠剥夺引起内质网应激的保护性反应最为强烈。     

砷及MPST过表达对SH-SY5Y细胞GRP78/CHOP通路的影响

目的探讨内质网应激是否参与亚砷酸钠(NaAsO2)神经毒性损伤,明确3-巯基丙酮酸硫转移酶(3-mercaptopyruvate sulfurtransferase,MPST)过表达是否调节砷诱导的内质网应激。方法通过构建MPST基因慢病毒表达载体来获得稳定表达外源MPST基因的SH-SY5Y细胞株作为SH-MPST过表达组,另设空载体转染细胞为SH-PEB组,染砷组(NaAsO2组),内质网应激阻断剂TUDCA组,TUDCA预处理染砷组。Western blot法分别检测过表达MPST、染砷及TUDCA预处理后细胞内GRP78和CHOP蛋白表达的变化。结果单纯MPST过表达不影响SH-SY5Y细胞内GRP78、CHOP蛋白的表达水平;经NaAsO2处理后,SH-PEB细胞内GRP78、CHOP蛋白明显上调(P<0.01),而被内质网应激阻断剂TUDCA所拮抗;MPST过表达则抑制砷对GRP78、CHOP蛋白的上调(P<0.01);然而,TUDCA预处理则明显逆转MPST过表达对GRP78、CHOP蛋白的影响(P<0.01)。结论GRP78/CHOP内质网应激通路参与了砷诱导的神经毒性损伤;MPST过表达可降低砷诱导的内质网应激水平。     

丙泊酚抑制GRP78/PERK/CHOP通路改善PE诱导H9C2细胞凋亡的研究

目的:研究丙泊酚对苯肾上腺素(phenylephrine, PE)诱导H9C2心肌细胞的影响及机制。方法:H9C2细胞均分为5组,PE诱导细胞凋亡模型,用0.5,1,1.5 mmol·L^-1丙泊酚预处理。采用流式细胞术检测凋亡率;RT-qPCR检测GRP78/PERK/CHOP通路的mRNA表达;蛋白质印迹检测GRP78/PERK/CHOP通路蛋白、caspase-12、caspsae-3、SERCA2a的表达;定磷法检测SERCA2a活性。结果:PE诱导心肌细胞凋亡率升高,GRP78/PERK/CHOP通路mRNA及蛋白表达升高,caspase-12、caspsae-3表达升高,SERCA2a蛋白表达及活性降低,差异有统计学意义(P均<0.05)。中、高浓度的丙泊酚可明显逆转PE诱导的上述指标变化,且差异有统计学意义(P均<0.05)。结论:丙泊酚通过恢复SERCA2a的活性及表达量、抑制GRP78/PERK/CHOP通路,降低PE诱导的心肌细胞凋亡。     

GRP78、GRP94在乳腺癌中的表达及其意义

目的:在对乳腺癌的临床研究中,探讨GRP78和GRP94表达水平所提示的临床意义.方法:将符合临床研究标准的患者的病理样本统一采用免疫组化法检测其GRP78、GRP94的表达,将检测结果数值用SPASS统计软件中卡方、spearman法和方差分析进行统计分析.结果:①乳腺癌组织中GRP78阳性表达高于癌旁组织,具有统计学意义(P＜0.01);GRP94表达也具有统计学意义.②在乳腺癌癌组织中,肿瘤大小≤2cm组与＞2cm组GRP78表达无统计学意义(P＞0.05);GRP94同样.③在肿瘤的高、中、低分化组比较GRP78表达具有统计学意义(P＜0.05);GRP94同样.④在淋巴结转移的分析中,有淋巴结转移组较无淋巴结转移组GRP78的阳性表达明显增高,且具有统计学意义(P＜0.01); GRP94表达同样.⑤在临床分期的比较中,临床分期越靠后GRP78的含量越高,具有统计学差异性(P＜0.01);GRP94表达也同样⑥GRP78、GRP94在乳腺癌肿的表达存在正相关.结论:①GRP78、GRP94在乳腺癌组织中呈高表达.②.GRP78、GRP94可能与乳腺癌的发生、发展及预后有关.     

2-脱氧葡萄糖对脑缺血再灌注模型大鼠脑组织中葡萄糖调节蛋白78及天冬氨酸半胱氨酸蛋白酶-12的影响研究

目的:探讨2-脱氧葡萄糖(2-DG)对脑缺血再灌注(IR)模型大鼠脑组织中葡萄糖调节蛋白78(GRP78)及天冬氨酸半胱氨酸蛋白酶-12(caspase-12)的影响。方法:取大鼠随机分为假手术组、模型组和2-DG组(2-DG100mg·kg-1),每组60只,后2组建立局灶性脑IR模型,假手术组行手术但不插入线栓。建模前7d开始给药,每天1次,连续7d,考察建模后3、6、12、24、48h各组大鼠海马CA1区细胞凋亡情况(阳性细胞率)、GRP78和caspase-12蛋白及其mRNA的表达情况。结果:与假手术组比较,模型组和2-DG组阳性细胞率、GRP78和caspase-12蛋白及其mRNA表达均明显升高(P均<0.01);与模型组比较,2-DG组阳性细胞率、cas-pase-12蛋白及其mRNA表达明显降低,GRP78蛋白及其mRNA表达明显升高(P<0.05或P<0.01)。结论:2-DG可能通过上调GRP78和下调caspase-12的表达来预防脑IR损伤。     

GRP78与 CHOP在缺血再灌注损伤中的作用

缺血再灌注（ischemia-reperfusion ,IR）过程中多种因素可导致内质网应激（endoplasmic reticulum stress response,ERS）, ERS参与缺血再灌注（ ischemia-reperfusion injury,IRI）的发展过程。总结ERS抗凋亡标志物GRP78与促凋亡标志物CHOP在IRI中的作用。 IRI时GRP78与CHOP表达的变化及其作用。明晰GRP78与CHOP参与IRI的机制。     

肿瘤细胞的进行性增殖和Bip/GRP78的合成

目的　探讨肿瘤细胞生长和Bip/GRP78合成的关系。方法　利用体外肿瘤细胞培养 ,离子交换色谱、SDS PAGE、特异性酶、化学降解和质谱分析等手段 ,检查生长在指数生长期、汇合期及汇合后期MCF 7、MDA MB 2 31两种人乳腺癌细胞Bip/GRP78的合成情况 ,并与正常人乳腺上皮细胞进行比较。结果　在两种肿瘤细胞进行性生长增殖过程中 ,Bip/GRP78呈赖生长状态、赖细胞密度和赖恶性程度性暴发性合成。结论　肿瘤细胞在生长增殖过程中 ,能通过赖生长状态、赖细胞密度和赖恶性程度性地合成Bip/GRP78来维持其内环境的稳定 ,构筑自身防御机制。因为大量的研究业已证实Bip/GRP78能降低细胞毒性T细胞对瘤细胞的杀伤力、促成肿瘤的生成和抗药性产生、防止肿瘤细胞凋亡等 ,因此有针对性地破坏肿瘤细胞Bip/GRP78合成 ,可为肿瘤的治疗提供一个新方法。     

葡萄糖调节蛋白和环氧合酶-2在肝癌组织中的表达及其相关性研究

目的 研究葡萄糖调节蛋白(GRP78)和环氧合酶-2(COX-2)在肝癌组织中表达及与临床病理资料的关系.方法 采用免疫组化法检测144例肝癌组织芯片中GRP78和COX-2的表达情况.结果 肝癌组织中GRP78、COX-2的阳性表达率分别为47.22%、56.94%;GRP78与乙肝病毒感染史、丙氨酸氨基转移酶(ALT)差异有统计学意义(P<0.05),但与性别、年龄、肝硬化病史、甲胎蛋白(AFP)、天冬氨酸氨基转移酶(AST)、碱性磷酸酶(ALP)、肿瘤大小、分期、分化程度差异无统计学意义(P>0.05),COX-2的表达与肿瘤组织分化程度差异有统计学意义(P<0.025),与性别、年龄、肝硬化病史、乙肝病毒感染史、AFP、AST、ALT、ALP、肿瘤大小、分期差异无统计学意义(P>0.05);COX-2与GRP78蛋白的表达呈正相关(r=0.204,P<0.025).结论 COX-2的表达与肝癌组织分化程度显著相关,GRP78阳性表达的肝癌组织中COX-2的表达升高,两者在肝癌组织中的关系密切.     

Chronic lithium administration triggers an over-expression of GRP94 stress protein isoforms in mouse liver

Moderate doses of lithium were chronically administered to mice in order to verify whether the cytoprotective effects of lithium could be in part attributed to a molecular protection conferred by stress proteins/chaperones accumulation. In order to reach serum lithium levels within the common therapeutic values, mice were fed for 6 months on food pellets contained 1 g (L1 group) or 2 g (L2 group) lithium carbonate/kg, resulting in serum concentrations of 0.5 and 0.9 mM Li, respectively. Under these experimental conditions, no clinical side-effects were observed. Urea and creatinine concentrations in serum, lipids peroxidation level and activities of catalase, superoxide-dismutase and glutathione-peroxidase in liver and kidney were not significantly different from control values. Although the expression level of the constitutive HSP73 was not significantly modified, HSP72 was found to be down-regulated in kidney after 1 month. In liver, three protein bands were immunodetected by the anti-GRP94 antibody: 98 kDa and 96 kDa proteins corresponding to more or less glycosylated forms and/or phosphorylated forms of GRP94 and a 80 kDa protein probably being a cleavage product of GRP94. The 96 kDa and 80 kDa proteins were significantly up-regulated in liver of lithium-treated mice as compared to controls.     

A unique P-glycoprotein interacting agent displays anticancer activity against hepatocellular carcinoma through inhibition of GRP78 and mTOR pathways

P-glycoprotein (P-gp) overexpression has been demonstrated in many malignancies being a predominant mechanism by which cancer cells develop multidrug resistance. Several categories of P-gp inhibitors have been demonstrated to potentiate anticancer effect induced by cancer chemotherapeutic drugs through competitive inhibition of P-gp pumping activity. Few studies show the agent that selectively acts on P-gp and, by itself, causes cell apoptosis while remain P-gp-deficient cells unaffected. KNG-I-322, a desmosdumotin B derivative, displayed a direct interaction with P-gp and demonstrated selective anti-proliferative and apoptotic activities in P-gp overexpressed Hep3B/VIN other than P-gp-deficient Hep3B cells. KNG-I-322 induced an inhibitory effect on the phosphorylation of mTOR^Ser2448, p70S6K^Thr389 and 4E-BP^Thr37/46 in Hep3B/VIN but not Hep3B cells. The inhibition was fully blocked by the knockdown of P-gp using siRNA techniques. Notably, the P-gp inhibitor, verapamil, also directly interacted with P-gp but significantly diminished KNG-I-322-induced anti-proliferative activity. After the mechanism study, the data showed that KNG-I-322 induced a dramatic down-regulation of GRP78 expression, which was significantly inhibited by verapamil and completely diminished by the knockdown of P-gp. The protein profile analysis of detergent resistant membranes showed that upon the stimulation by KNG-I-322, the level of P-gp expression in non-raft fractions was dramatically increased and, concomitantly, the GRP78 expression was significantly decreased. Taken together, the data suggest that KNG-I-322 induces anticancer activity in Hep3B/VIN cells through a direct interaction with P-gp, leading to the inhibition of mTOR pathways and the induction of GRP78 down-regulation. The data support that KNG-I-322 is a selective anticancer agent against P-gp-overexpressed other than P-gp-deficient cancer cells.     

Glucose-deprived HT-29 human colon carcinoma cells are sensitive to verrucosidin as a GRP78 down-regulator

Glucose deprivation, a feature of poorly vascularized solid tumors, activates the unfolded protein response (UPR) which is a stress-signaling pathway in tumor cells that is associated with the molecular chaperone GRP78 and induction of GRP78 has been shown to protect them against programmed cell death. Thus, targeting glucose-deprived conditions may be a novel strategy in anticancer drug development. Based on that, we established a novel screening program for chaperone modulators that preferentially cytotoxic activity in cancer cells under glucose-deprived conditions. During the course of our screening system, we recently isolated an active compound, 326-2, from Penicillium verrucosum var. cyclopium and identified it as a down-regulator of the grp78 gene. As expected, 326-2 inhibited the expression of the GRP78 promoter under glucose-deprived conditions in a dose-dependent manner with an IC(50) value of 50nM. Furthermore, 326-2 was identified as verrucosidin, a pyrone-type polyketide, by ESI-MS analyses and various NMR spectroscopic methods. We found that verrucosidin prevents UPR-induced expression of protein, such as GRP78, whose expression is induced by glucose-deprived or by 2-deoxyglucose; this effect is not seen under normal growth conditions. The GRP78-inhibitory action of verrucosidin was dependent on strict hypoglycemic conditions and resulted in selective cell death of glucose-deprived HT-29 human colon cancer cells.     

Therapeutic angiogenesis of mouse hind limb ischemia by novel peptide activating GRP78 receptor on endothelial cells

Therapeutic angiogenesis emerged as a non-invasive mean of promoting neovascularization in ischemic tissues. We have searched for new molecules that induce angiogenesis by screening a phage display combinatory peptide library on endothelial cells. One of the selected peptides identified by binding to endothelial cells under hypoxic conditions was further studied. The aim of this study was to assess the therapeutic value of this peptide, RoY, in a mouse hind limb ischemia model and to identify it's receptor on endothelial cells.RoY, a 12 amino-acid synthetic peptide, induced in vitro angiogeneic activity under hypoxic conditions by increasing endothelial cell proliferation, migration and tube formation. In order to assess its therapeutic properties in ischemic tissues, a hind limb ischemia model was induced in C57BL mice by a femoral artery excision. A single local intramuscular injection of RoY peptide to the operated limb, significantly restored blood perfusion and alleviated hind limb ischemia as determined by a laser Doppler imager. Increased capillary density in histological sections corroborated these findings. Protein precipitation and mass spectroscopy studies identified GRP78, a heat shock protein, as the peptide-binding membrane receptor that was increased on endothelial cell membranes under hypoxic conditions. This study demonstrates the efficacy of RoY peptide in alleviation of hind limb ischemia. In addition, it provides evidence that GRP78 is an angiogenic receptor on hypoxic endothelial cells.     

姜黄素对大鼠肠缺血再灌注后肠黏膜细胞凋亡及GRP78表达的影响

目的 观察姜黄素对大鼠肠缺血再灌注后肠黏膜细胞凋亡及GRP78表达的影响。方法 30只雄性SD大鼠随机分为假手术组、模型组、姜黄素组。采用无创性动脉夹夹闭肠系膜上动脉1 h后实施再灌注来建立肠缺血再灌注模型,姜黄素组在手术前5 d开始每天按200 mg/kg ig给药1次,假手术组仅分离肠系膜上动脉,不夹闭。采用HE染色观察肠黏膜损伤情况并进行病理评分;TUNEl法观察肠黏膜细胞凋亡情况并计算凋亡指数;Western blotting检测再灌注损伤3 h时肠黏膜GRP78及Caspase-12蛋白表达。结果 模型组肠黏膜损伤严重,绒毛上皮成块脱落,固有层破坏、溃疡,腺体破坏严重;姜黄素组肠黏膜绒毛上皮仅部分脱落,腺体排列紊乱,与模型组比较,病理评分显著降低（P<0.05）;模型组肠黏膜隐窝可见大量凋亡阳性细胞;与模型组比较,姜黄素组肠黏膜隐窝上皮细胞凋亡情况明显减轻,凋亡指数显著下降（P<0.05）;与模型组比较,姜黄素组GRP78蛋白表达量显著增加（P<0.05）,Caspase-12蛋白表达量显著下降（P<0.05）。结论 姜黄素有可能通过上调GRP78表达,减少内质网应激所致肠黏膜细胞凋亡,来减轻肠黏膜的再灌注损伤,达到保护肠黏膜作用。