热休克蛋白27在大鼠反流性食管炎食管组织的表达

Background  Little attention has been paid to the expression of heat shock protein 27 (HSP27) in patients with reflux esophagitis (RE), and few studies of the importance of HSP27 in esophagitis have been carried out in animal models. This study aimed to explore the expression of HSP27 in the esophageal tissue of rats with RE.

Methods  Eighty female Wistar rats were randomly divided into experimental groups A and B and control groups C and D (n=20 in each group). To establish RE, rats in the two experimental groups received pylorus and forestomach ligations, while rats in the control group received gastrostomy and gastric perforation repair. The rats in groups A and C were sacrificed 7 days after surgery, and the rats in groups B and D were sacrificed 14 days after surgery. In groups A and B, 10 and 8 rats were diagnosed with RE by pathological examination, respectively (they were included in groups A’ and B’, respectively). The histopathological diagnosis of all the lower esophageal tissues in groups C and D was normal and 20 normal specimens were randomly selected for groups C’ and D’ with 10 specimens in each group. Macroscopic and microscopic esophagitis scores were assessed for the specimens in groups A’ and B’. Lower esophageal tissues were collected from groups A’, B’, C’, and D’, and paraffin-embedded slices were made using part of the tissues. The expression of HSP27 in the tissues was detected using the two-step streptavidin-peroxidase immunohistochemical method. Some collected tissues were frozen, and expressions of HSP27 mRNA were detected using fluorescence quantitative polymerase chain reaction (FQ-PCR).

Results  Median macroscopic and microscopic esophagitis scores in groups A’ (n=10) and B’ (n=8) were 1.0 and 1.5, and 2.0 and 2.5, respectively. There were no significant differences in the macroscopic or microscopic esophagitis scores between the two groups (Z=–0.330, P=0.741; Z=–0.142, P=0.887, respectively). Immunohistochemical staining showed that HSP27 was expressed in all layers of the esophageal epithelia in RE and control rats. FQ-PCR showed that HSP27 mRNA levels in the lower esophageal tissue in RE group (groups A’ and B’) were higher than those in control group (groups C’ and D’) (Z=–0.249, P=0.001). HSP27 mRNA expression in the lower esophageal tissue was significantly different in groups B’ and D’ (Z=–3.027, P=0.002). And the levels of HSP27 mRNA expression in severe RE group (microscopic esophagitis score: 3) were higher than in mild RE group (microscopic esophagitis score: 1–2) and control group (Z=–3.396,P=0.001; Z=–3.855, P <0.001).

Conclusions  HSP27 mRNA expression in the lower esophageal tissue of rats with RE is significantly higher than in the normal controls. Although reflux is a persistent stimulating factor, increased expression of HSP27 in the lower esophageal tissue of rats with RE requires aggravated esophageal injury.

     

热休克蛋白27对大鼠臂丛神经根撕脱伤后脊髓运动神经元细胞凋亡的影响

目的:观察热休克蛋白27(Hsp27)对大鼠臂丛神经根撕脱后脊髓前角运动神经元细胞凋亡的影响.方法:健康雄性Wistar大鼠60只,随机分为实验组和对照组.实验组动物分别以45℃热休克预处理15min,42℃维持20min,室温恢复24h后,在手术显微镜下进行脊髓C5～T1节段神经根撕脱术,分别于术后12h及1,3,5,7d处死动物.对照组仅施行臂丛神经根撕脱术,并分别于术后12h及1,3,5,7d处死动物.各组分别进行Hsp27免疫组织化学染色和原位末端标记法(TUNEL)检测脊髓运动神经元细胞凋亡情况,结合图像对结果进行分析.结果:两组Hsp27表达高峰均在热休克后1d;实验组脊髓运动神经元细胞凋亡在1d达到高峰,而对照组出现在3d,且凋亡细胞数明显高于实验组.结论:Hsp27可抑制臂丛神经根撕脱伤后脊髓运动神经元凋亡.     

Expression of Heat Shock Protein 70 and 27 in Non-small Cell Lung Cancer and Its Clinical Significance

The heat shock proteins （HSPs） 70 and HSP 27 expression in patients with non-small cell lung cancer （NSCLC） was studied and the relation.ship between HSP 70 and HSP 27 with the clinicopathological features of NSCLC was investigated. The expression of HSP 70 and HSP 27 was detected in tumor tissues from 60 patients with NSCLC by S-P immunohistochemistry. The findings were analyzed in combination with the histological types, histopathological differentiation, lymph node metastasis, patients＇ clinical stages, smoking history and gender. The results showed that of the 60 NSCLC tissue specimens studied, the immunoreactivity of HSP 70 and HSP 27 was detected in 47 （78.3 %） and 43 （71.7 %） specimens, respectively. A positive correlation was found between the overexpression of HSP 70 and HSP 27. The histopathological differentiation, lymph node metastasis, clinical stages and smoking history were correlated to the expression of HSP 70, but not to the expression of HSP 27. No statistical significance was observed in histological types and gender with respect to both HSP 70 and HSP 27 expression. It is suggested that the HSP 70 expression is a powerful and significant prognostic indicator and is related to histopathological differentiation, lymph node metastasis, patients＇ clinical stages, smoking history, whereas HSP 27 expression is not.     

Akt参与热休克蛋白27保护大鼠心肌细胞过氧化损伤

目的:探讨小分子热休克蛋白27保护大鼠心肌细胞过氧化损伤的机制.方法:①以稳定转染 pCDNA3.1/Hsp27质粒并稳定高表达Hsp27的大鼠心肌细胞株H9c2(H9c2-Hsp27)为研究对象.对照组采用稳定转染pCDNA3.1质粒的H9c2(H9c2-Vector)细胞;②氧化应激诱导和检测:500 μmol/L H2O2处理细胞后进行如下分析:培养上清中的 LDH 活性、细胞形态学改变、细胞内Akt激活水平;③Akt在Hsp27保护 H2O2诱导H9c2损伤中的作用:以Akt抑制剂Triciribine处理H9c2-Hsp27,观察其对Hsp27保护H2O2诱导H9c2形态学变化的影响.结果:①H2O2诱导H9c2细胞向培养上清释放的LDH显著增加(P<0.01),但与对照组相比,Hsp27 高表达显著抑制了 H2O2诱导的LDH释放(P<0.01);②H2O2处理后,H9c2细胞Akt磷酸化水平增加(P<0.01或P<0.05),但与H9c2-Vector比较,H9c2-Hsp27的Akt磷酸化水平进一步增强(P<0.05);③Akt磷酸化被抑制后,Hsp27对H2O2诱导H9c2细胞形态学改变的保护作用消失.结论:Akt激活是Hsp27保护大鼠心肌细胞过氧化损伤的重要机制.     

前列腺癌中热休克蛋白27作用的研究进展

前列腺癌是成年男性最常见的肿瘤之一,而热休克蛋白(HSPs)作为广泛参与多种肿瘤发病机制、诊断、治疗和预后的分子伴侣,在前列腺癌中发挥着重要的生物学功能,并且HSP27被认为是与前列腺特异性膜抗原类似的生物标志物。其中,热休克蛋白家族成员HSP27的表达增加与前列腺癌去势抵抗有关,并且能够促进肿瘤耐药、侵袭与骨转移,从而使前列腺癌更加难以治疗。因此,靶向前列腺癌中的HSP27可以作为一种有前景的肿瘤治疗策略。本文就HSP27的结构与功能、前列腺癌中HSP27介导的去势抵抗及以HSP27为靶点的抗肿瘤治疗研究进行综述,以期为临床中前列腺癌治疗方案提供新的理论依据。     

Heat shock protein 27 regulates oxidative stress-induced apoptosis in cardiomyocytes: mechanisms via reactive oxygen species generation and Akt activation

Background  Increased reactive oxygen species (ROS) formation, which in turn promotes cardiomyocytes apoptosis, is associated with the pathogenesis and progression of various cardiac diseases such as ischemia and heart failure. Recent studies have shown that over expression of heat shock protein 27 (Hsp27) confers resistance to cardiac ischemia/reperfusion injury. However, not much is known about the regulation of myocyte survival by Hsp27.
Methods  The rat cardiac cell line H9c2, with a stable overexpression of Hsp27, was established, with empty vector transfected H9c2 cells as controls. Following the cells challenged by Hydrogen Peroxide (H₂O₂), lactate dehydrogenase (LDH) release, apoptosis, intracellular ROS, cell morphology, mitochondrial transmembrane potential and the activation of serine/threonine kinase Akt were determined.
Results  Along with marked suppression of H₂O₂-induced injury by Hsp27 overexpression in H9c2 cells, ROS generation and the loss of mitochondrial membrane potential were also significantly depressed. Furthermore, augmented Akt activation was observed in Hsp27 overexpressed H9c2 cells following H₂O₂ exposure.
Conclusions  Hsp27 inhibits oxidative stress-induced H9c2 damage and inhibition of ROS generation and the augmentation of Akt activation may be involved in the protective signaling.

     

羰基还原酶1和热休克蛋白27可能是肝癌早期标志物

目的:以小肝癌为研究对象筛查早期肝癌的潜在标志物。方法:从10例乙肝相关小肝癌病人的癌组织和癌旁相对正常组织中提取蛋白质,采用双向凝胶电泳将蛋白质充分分离。胶图分析后,对肝癌相关蛋白质采用MALD I-TOF/TOF质谱仪鉴定。最后采用实时聚合酶链反应(Real-time PCR)和免疫印迹(W esternblotting)方法来评估羰基还原酶1(CBR1)、热休克蛋白27(HSP27)在肝组织中的表达。结果:在肝癌组织中发现了15个上调和3个下调蛋白。氧化还原酶和5种代谢相关酶中的3种在癌组织中升高,2种代谢相关酶在癌组织中降低。Real-time PCR和W estern blotting证实了10例小肝癌中CBR1和HSP27的高表达。结论:CBR1和HSP27可能是早期肝癌的诊断标志物。     

Over-expression of heat shock protein 27 attenuates doxorubicin-induced cardiac dysfunction in mice

Background：Oxidative stress and myocyte apoptosis are thought to play an important role in the pathogenesis, progression and prognosis of heart failure（HF）. Heat shock protein 27 （Hsp27） has been found to confer resistance to oxidative stress in cultured cells; however, the role of Hsp27 in in-vivo hearts remains to be determined. Aim：To investigate the effects of Hsp27 over- expression on doxorubicin-induced HF. Methods and Results：Transgenic mice （TG） with cardiac specific over-expression of Hsp27 and their wild type littermates （WT） were challenged with doxorubicin （25 mg/kg, IP） to induce HE＇ At day 5, TG mice had significantly improved cardiac function and viability and decreased loss of heart weight following doxorubicin exposure compared with WT. In another parallel experiment, doxorubicin-induced increased levels of reactive oxygen species, protein carbonylation, apoptosis and morphologic changes were detected in the mitochondria in WT hearts, whereas these effects were markedly attenuated in TG hearts. In addition, upregulation of heat shock protein 70 and heme oxygenase-1 was present in the TG hearts after doxorubicin stimulation in comparison to WT hearts. Conclusion：These findings indicate that Hsp27 may play a key role in resistance to doxorubicin-induced cardiac dysfunction. （c）2007 European Society of Cardiology. Published by Elsevier B.V. All rights reserved.     

靶向沉默热休克蛋白27对口腔鳞状细胞癌CAL27细胞侵袭和迁移的作用及其机制

目的:探讨热休克蛋白27(HSP27)对口腔鳞状细胞癌(OSCC)CAL27细胞侵袭和迁移的影响,并阐明其作用机制.方法:CAL27细胞分为对照组[转染阴性对照小干扰RNA(NC-siRNA)]和实验组[转染HSP27小干扰RNA(HSP27-siRNA)],实时荧光定量PCR(RT-qPCR)和Western blo...     

热休克蛋白70对大鼠心肺复苏后神经细胞凋亡的影响

目的:研究热休克蛋白70(HSP 70)对大鼠心肺复苏后神经细胞凋亡的影响,探索HSP对脑复苏的可行性。方法:将46只成年Wistar大鼠随机分为假手术组、模型组与干预组,假手术组不进行模型制作及治疗干预;模型组仅制作心搏骤停(SCA)并心肺复苏动物模型,不进行治疗干预;干预组大鼠在SCA并心肺复苏模型制作后静脉注射HSP 70。分别于6、12 h后检测各组大鼠脑海马区神经细胞凋亡数目、Bcl-2蛋白表达量,对比分析各组大鼠神经细胞凋亡情况的差异,验证HSP 70对大鼠心肺复苏后神经细胞凋亡的保护作用。结果:HSP 70对大鼠心肺复苏后神经细胞具有保护作用,能减少神经元细胞凋亡数目,增加Bcl-2蛋白表达。结论:HSP 70对大鼠心肺复苏后神经细胞有保护作用,对脑复苏具一定的治疗前景。     

热休克蛋白70在人胶质瘤耐药过程中的作用

目的 应用热休克人胶质瘤细胞的方法,观察热休克蛋白70(HSP 70)在人胶质瘤细胞耐药过程中的作用.方法 经43 ℃热处理2 h的人胶质瘤细胞,应用半定量逆转录聚合酶链反应(RT-PCR)及免疫组化技术检测HSP 70 mRNA及蛋白的表达情况;应用hoechst 33258荧光染色的方法观察化疗药物阿霉素(adriamycin,ADM)作用后,不同处理组人胶质瘤细胞的凋亡情况.结果 HSP 70免疫组化,HS ADM组阳性率为(61.5±18.3)%,与HS组(61.0±14.1)%比较没有统计学意义,但显著高于对照组(8.50±4.09)%(P＜0.05),RT-PCR结果与免疫组织化学一致;ADM组凋亡细胞比率为(52.7±19.1)%,显著高于对照组(6.5±3.6)%(P＜0.05),HS ADM组(25.0±10.7)%高于对照组但显著低于ADM组(P＜0.05),HS组(7.2±3.6)%与对照组没有明显差异(P＞0.05).结论 热休克的方法可以诱导人胶质瘤细胞HSP 70的表达;HSP 70可能是引起人胶质瘤细胞耐受ADM的机制之一.     

Study of heat shock protein HSP90α, HSP70, HSP27 mRNA expression in human acute leukemia cells

Summary The expression of three heat shock proteins (HSPs)-HSP90α, HSP70, HSP27 in cells obtained from 22 patients with leukemia, K562 erythroleukemia cell line, and normal blood cells was observed by means of RNA dot blot analysis. The results showed that the expression of the HSP27 gene was enhanced in 4 cases of acute lymphoid leukemia (ALL), 7 cases of acute nonlymphoid leukemia (ANLL) and 2 cases of myelodysplastic syndrome. (MDS) as compared with that of the normal blood Cells, yet there was no significant difference in the HSP27 expression between the ALL and ANLL cells. The expression of HSP70 in all the 5 ALL and ANLL patients was much lower than that of the normal subjects, except 1 case of ALL and 1 case of MDS, in which the expression was obviously enhanced. All the cases including 11 ANLL, 5 ALL and 1 MDS had higher HSP90α expression than the normal subjects. The enhanced expression pf HSP90α in leukemia cells may be associated with the active and indefinite proliferation of leukemia cells. Our results also suggest that the high expression of the HSP27 gene may not be confined to a specific type of acute leukemia.     

p38激酶-HSP27信号通路在染料木黄酮诱导人乳腺癌细胞肌动蛋白细胞骨架解聚中的作用

目的:研究染料木黄酮(genistein)对人乳腺癌细胞(MDA-MB-435)肌动蛋白细胞骨架的影响,探讨p38激酶-HSP27信号通路对染料木黄酮诱导的细胞骨架肌动蛋白重组调控的可能机制.方法:不同浓度染料木黄酮(12.5、25.0、50.0和100.0 μmol/L)体外孵育MDA-MB-435细胞24 h后,用免疫印迹法研究细胞内p38激酶和HSP27表达及磷酸化水平的改变,同时分析肌动蛋白,HSP27其在细胞内定位的改变.结果:染料木黄酮处理24 h,胞浆中的G-肌动蛋白含量明显增多,而细胞骨架中的F-肌动蛋白含量明显减少;p38激酶和HSP27的蛋白总量无明显改变,但二者磷酸化水平随着染料木黄酮处理浓度的增加逐渐降低;与此相应的是HSP27在胞浆中含量明显减少,在细胞骨架中含量明显增多.结论:p38激酶途径以及HSP27磷酸化/脱磷酸化过程可能介导染料木黄酮所致MDA-MB-435细胞肌动蛋白细胞骨架的重组.     

人肾癌组织中热休克蛋白70的纯化与鉴定分析

目的探讨人肾癌组织中热休克蛋白70纯化的有效方法，并进行鉴定分析。方法应用两次亲和层析和离子交换层析获得目的蛋白，经电泳和Western-blot定性分析，应用改良的Bradford法定量分析。结果经过二次亲和层析和Mono Q柱的分离后，得到纯度较高的分子量约为70kDa的蛋白质，经免疫印迹分析证实该蛋白质即为HSP70。与其他方法相比HSP70的纯度更高，获得率接近。结论该文所述方法是一种简单有效的纯化肿瘤组织中HSP70的方法。     

Immunohistochemical expression of heat shock protein27 in the mouse dental pulp after immediate teeth separation

Aim

After immediate teeth separation, expression of HSP27 in the mouse dental pulp was examined. Immunohistochemistry was performed to examine the incidence of HSP27 expression.

Materials and methods

A total of 36 8-week-old ddY mice were used as experimental subjects and a wedge was inserted in between maxillary right molars. The wedge was removed 30 min or 3 h after insertion. Animals were immediately sacrificed after the removal of wedge or until 1 week later and serial sections from paraffin-embedded tissues were prepared. Immunohistochemistry was carried out to examine the expression of HSP27. The untreated side served as the control.

Results

In the control group, the endothelial cells and some pulp fibroblasts weakly expressed HSP27 suggesting that the expression is due to mechanical stress brought about by physiological masticatory force and pressure from the tongue. In both 30 min and 3 h experimental groups, HSP27 expression was highest at 24 h after wedge removal and the expression remained the same or started to decrease thereafter. The expression decreased at the same level as that of the control group 1 week after wedge removal.

Conclusion

HSP27 may serve as an indicator of stimulus strong enough to show its expression.

     

Effects of Sodium Salicylate on the Expression of HSP27 Protein during Oxidative Stress in Tissue-cultured Human Lens Epithelial Cells

The lens is avascular and has no innervation, and must derive nutrients from the aqueous humor[1]. Heat shock protein (HSP) was discovered by Ritossa in 1962 as a special group of heat shock biosynthetic proteins with various forms. Although stress responses include all of the processes that organisms have developed to sur-vive when they are exposed to environmental challenges, such as heat stress, desiccation, chemical stress, or star-vation, the effector proteins are almost all referred to …     

Zinc is a potent heat shock protein inducer during liver cold preservation in rats

Objective A simple liver cold preservation model was established to study the synthesis of heat shock protein 70 (HSP70) induced by zinc (ZnSO［4］,i.p.) and its protection during liver cold preservation in rat.Methods Male Wistar rats were divided into 5 groups (n=6).In control group rat received no pretreatment; in Zn-1 group, Zn-2 group, and Zn-3 group rats were pretreated with zinc sulfate at a dose of 5 mg/kg, 10 mg/kg, 15 mg/kg respectively; and in H group rat received heat shock preconditioning (42.5℃×15 min).Livers were preserved in UW solution for 6, 12 and 24 h, respectively.HSP70 was analyzed by Western blot.Aspartate transaminase (AST) and lactate dehydrogenase (LDH) values of the perfusion solution and the histology of the liver were evaluated.Results HSP70 expression was markedly elevated after pretreatment with zinc and heat shock.AST and LDH values in the Zn-1, Zn-2 and H groups were significantly lower than those in the control group, respectively (P&lt;0.05).There was no significant difference among the three groups (P&gt;0.05), whereas the AST and LDH values in the Zn-3 group were much higher than those in the control group.Histology results showed that liver injury in the Zn-1, Zn-2 and H groups were minimal, while it was severe in the Zn-3 group.Conclusions Zn(2+) is a potent and feasible inducer of HSP expression and is able to protect liver from cold preservation injury.The proper inducing dosage of Zn(2+) ranged from 5 mg/kg to 10 mg/kg.The dosage of 15 mg/kg for Zn(2+) as a HSP inducer is not indicated for its severe toxicity to the liver.     

荧光定量PCR测定水杨酸钠作用后大鼠耳蜗基因的表达

目的了解HSP27基因在大剂量水杨酸钠作用后大鼠耳蜗中表达水平，并探讨其在水杨酸钠耳毒性中的意义。方法将Wistar大鼠各15只分成水杨酸钠作用组和正常对照组，应用SYBR GREEN I实时监测的逆转录-聚合酶链反应（RT-PCR），检测大鼠耳蜗中HSP27基因在长期大剂量水杨酸钠作用后和正常对照组中的表达，并用管家基因β-actin作为内参。结果水杨酸钠作用后大鼠耳蜗中HSP27基因的表达水平高于正常对照组，差异有统计学意义（P〈0．01）。结论SYBR GREEN I定量PCR法可以作为一种良好的方法对来源珍贵的微量组织的基因表达进行检测，水杨酸钠能够明显诱导HSP27基因在大鼠耳蜗中的表达。