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。     

Lentivirus-mediated RNA interference targeting the ObR gene in human breast cancer MCF-7 cells in a nude mouse xenograft model

Background  There is a significant association between obesity and breast cancer, which is possibly due to the expression of leptin. Therefore, it is important to clarify the role of leptin/ObR (leptin receptor) signaling during the progression of human breast cancer.

Methods  Nude mice with xenografts of MCF-7 human breast cancer cells were administered recombinant human leptin subcutaneous via injection around the tumor site. Mice in the experimental group were intratumorally injected with ObR-RNAi-lentivirus, while negative control group mice were injected with the same dose of negative-lentivirus. Tumor size was blindly measured every other day, and mRNA and protein expression levels of ObR, estrogen receptor a (ERa), and vascular endothelial growth factor (VEGF) for each group were determined.

Results  Knockdown of ObR-treated xenografted nude mice with a high leptin microenvironment was successfully established. Local injection of ObR-RNAi-lentivirus significantly suppressed the established tumor growth in nude mice. ObR level was significantly lower in the experimental group than in the negative control group, while the amounts of ERα and VEGF expression were significantly lower in the leptin group than in the control group (P <0.01 for all).

Conclusions  Inhibition of leptin/ObR signaling is essential to breast cancer proliferation and possible crosstalk between ObR and ERa, and VEGF, and may lead to novel therapeutic treatments aiming at targeting ObR in breast cancers.

     

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.     

人热休克蛋白70基因在大肠杆菌中的表达及纯化

目的:构建人热休克蛋白70(HSP70)的原核表达载体,诱导其表达并纯化.方法:应用PCR技术从人胆管癌组织中扩增出HSP 70基因片段,经T-A克隆连接到末端经平滑处理后的pMD18-T Simple质粒并测序.利用双酶切技术构建重组原核表达载体pGEX-4T-1-HSP 70,并转化大肠杆菌JM 109,经IPTG诱导后表达得到HSP70融合蛋白.应用Glutathione-Sepharose4B亲和层析柱提纯融合蛋白,用生物素化凝血酶分离并纯化目的蛋白,最后行Wsetern blot鉴定.结果:PCR扩增结果与预计目的基因大小一致;序列分析与GeneBank中收录完全一致;重组表达载体pGEX-4T-1-HSP 70构建成功;Western blot结果显示目的蛋白可以与兔抗人的HSP70单克隆抗体特异性结合.结论:HSP 70编码序列已经成功克隆至原核表达载体pGEX-4T-1,并在大肠杆菌JM 109中获得表达.     

重组人热休克蛋白70生物活性的快速鉴定

目的　快速鉴定纯化后的重组人热休克蛋白 70 (rHSP70 )的特异性及其是否具有生物活性。方法　将rHSP70与肿瘤细胞内的小分子多肽在一定条件下温育 ,并利用含 5 %甘油的Nativepage电泳分析。 结果　可快速鉴定出rHSP70是否具有生物活性 ,电泳后凝胶可做Western -blot特异性鉴定。结论　该法操作简便 ,重复性好 ,既可快速鉴定rhsp70的生物活性 ,又可特异性鉴定rhsp70自身     

Increased expression of 70 kD heat shock protein in cultured primary human keratinocytes induced by human papillomavirus 16 E6/E7 gene

Background Heat shock protein 70 （HSP70） is expressed highly in epithelial tumours associated closely with human papillomavirus 16 （HPV16） infections. However, evidence about the direct relationship between HSP70 expression and HPVs infections are still lacking. In the present study, we examined the expression of HSP70 in keratinocytes introduced with HPV16 E6/E7 oncogenes. Methods Stable transfected cells were established by transfection of the plasmids pLXSN16E6/E7 into cultured primary keratinocytes and subsequently selected by plasmid specific selection antibiotic （G418） at the required concentration. The expression of HSP70 in pLXSN16E6/E7 transfected keratinocytes was determined by Western blot. The correlation of HSP70 expression and E6/E7 transfeetion was further confirmed by doubly labelled immunofluorescent staining. Results Compared to non-transfected keratinocytes, there was a significant trend for higher levels of HSP70 in pLXSN16E6/E7 transfected keratinocytes. Doubly labelled immunofluorescent staining experiment showed that the co-localization of HPV16 E6/E7 and HSP70 in transfeeted keratinoeytes was observed and increased expression of HSP70 was strongly associated with the transfection of HPV16 E6/E7. Conclusions Our studies demonstrated increased levels of HSP70 proteins in keratinocytes stably transfected by HPV16 E6/E7 oncogenes. It suggests that the expression of HSP70 is modulated by HPV16 E6/E7 proteins, which may be involved in HPV16 E6/E7 induced immortalization.     

强脉冲光对皮肤热休克蛋白70表达的影响

目的 观察强脉冲光对皮肤热休克蛋白70表达的影响,探讨光子嫩肤的分子生物学机制。方法 选择15只SD大鼠,每只选3个部位用强脉冲光照射,采用同一照射参数,能量密度34J/cm²,分为3个脉冲,脉宽各为4、5、6ms,脉冲延时为20及25ms。照射后第1、3、5、7、15、30天分别于治疗及非治疗部位切取皮肤样本,免疫组化染色,观察。结果 照射部位第1天皮肤表皮、皮脂腺细胞、毛细血管内皮细胞均呈阳性染色,第7天达高峰,第15天染色渐弱,第30天染色基本消失,非治疗部位染色阴性。结论 强脉冲光照射皮肤后可引起热休克蛋白70表达的增加,提示热休克蛋白70在光子嫩肤过程中起一定作用。     

HSP-70与细胞保护的研究进展

热休克蛋白70（HSP-70）是生物体产生的一种有高度保守性的应激蛋白,可以增强细胞对损害的耐受程度,维持细胞的正常代谢功能,提高细胞的生存率。在中枢神经系统、心肌、肝脏、肺等组织器官损伤中具有保护作用。     

瘦素对乳腺癌MCF-7细胞增殖和凋亡的影响及其作用机制

目的: 研究瘦素对乳腺癌MCF-7细胞增殖和凋亡的影响,并探讨其作用机制。方法: 选取处于对数生长期的MCF-7细胞,随机分为对照组和20、40、80 μg·L^-1瘦素处理组。CCK8试剂盒检测各组MCF-7细胞增殖率;流式细胞术检测各组MCF-7细胞凋亡率;RT-PCR和Western blotting法分别检测各组MCF-7细胞bcl-2和bax的mRNA和蛋白表达水平;在抗凋亡作用的信号通路筛选实验中采用Western blotting法检测不同信号通路抑制剂处理组MCF-7细胞p-AKT和bcl-2的蛋白表达水平。结果: 与对照组比较,不同剂量瘦素处理组MCF-7细胞增殖率升高(P<0.05),且呈剂量依赖性,不同剂量瘦素组之间比较差异也有统计学意义(P<0.05);随着瘦素作用剂量增加,不同剂量瘦素处理组细胞凋亡率逐渐降低,与对照组比较差异有统计学意义(P<0.05);与对照组比较,不同剂量瘦素处理组MCF-7细胞 bcl-2 mRNA和蛋白表达水平增加(P<0.05),bax mRNA和蛋白表达水平降低(P<0.05);与瘦素组比较,PI3K-AKT信号通路抑制剂LY294002处理组MCF-7细胞的p-AKT和bcl-2蛋白表达水平明显下降(P<0.05)。结论: 瘦素对乳腺癌MCF-7细胞有促进增殖和拮抗凋亡的作用,其抗凋亡效应与通过细胞信号通路PI3K-AKT促进bcl-2表达有关。     

Enhanced sensitivity to mitomycin C by abating heat shock protein 70 expression in human bladder cancer cell line of BIU-87

Background Bladder cancer is a relatively common tumor in the urinary system, in which mitomycin C (MMC)-based chemotherapy or combination chemotherapy has been mainly used to treat patients with advanced bladder cancer. The prognosis of patients with advanced bladder cancer is still extremely poor in spite of recent therapeutic advances. To improve the prognosis, the sensitivity of tumor cells to mitomycin C by the induction of apoptosis with the abating heat shock protein 70 (HSP70) expression in human bladder cancer cell lines of BIU-87 was investigated. Methods HSP70 expression was abated in BIU-87 cells by HSP mRNA antisense oligomers. MTT assay and the clone-forming test were used for evaluating the sensitivity of cells to MMC. Apoptosis was assessed using both fluorescent microscopy after staining the cells with Hoechst 33258 and DNA fragment ladder agarose electrophoresis. Thirty-two male six-week-old BALB/c nude mice, at the beginning of the experiment, were used to evaluate the effect of antisense oligomers (ASO) on the tumor formation in vivo. Results HSP70 expression in BIU-87 was effectively abated by HSP70 mRNA antisense oligomers. The percentage of apoptotic cells in ASO group was greater than in sense oligomers (SO) ［P&lt;0.05, （18.31±2.89）% vs （1.89±0.74）%］, nonsense oligomers (NO) ［P&lt;0.05, （18.31±2.89）% vs （1.78±0.92）%］ and blank groups ［P&lt;0.05, （18.31±2.89）% vs （1.87±0.84）%］, while the sensitivity of tumor cells to mitomycin C was enhanced. The in vivo tumor inhibition rate of ASO plus MMC (&gt;50%) was more than that of ASO or MMC group alone (all P&lt;0.05). Conclusions The abating level of HSP70 expression can strengthen the sensitivity of BIU-87 to MMC. One of this effect might be related to the induction of apoptosis by abating HSP70 expression. Chin Med J 2005; 118(23):1965-1972     

人热休克蛋白70D的基因克隆、表达及蛋白纯化

目的：研究热休克蛋白70D(heat shock protein 70D，HSP70D)的基因克隆、重组表达及纯化。方法：采用RT-PCR方法从HeLa细胞中克隆HSP70D全长编码区cDNA序列，构建原核表达载体pET24a（ ）-HSP70D，经过DNA序列测定证实共序列正确。完成基因工程人HSP70D的高表达工程菌的筛选后，对其发酵、蛋白表达条件及重组蛋白的纯化条件进行优化。结果：重组表达载体经序列测定及酶切鉴定与理论推测结果相符，高表达工程菌经优化表达条件后rhHSP70D的表达量可占菌体总蛋白的20％以上。经过低浓度乙醇沉淀、DEAE阴离子交换、疏水柱层及S200凝胶过滤柱后，获得了纯度大于95％的rhHSP70D。结论：本研究为进一步开展以HSP70D为基础的肿瘤免疫治疗研究提供了实验基础。     

诱导热休克蛋白70对感染后肠易激综合征小鼠的影响

目的 探讨诱导热休克蛋白70(HSP70)对感染后肠易激综合征(P[-IBS)小鼠的影响.方法 将84只雌性C57BL/6小鼠随机分为对照组、PI-IBS组、诱导+PI-IBS组、诱导组,每组21只.PI-IBS组给予旋毛虫感染;诱导+ PI-IBS组先给予热预处理,再给予旋毛虫感染;诱导组只给予热预处理,正常对照组不给予处理.Western blot检测肠道HSP70蛋白表达量,观察肠组织病理学表现,对肠组织行炎症评分,观察腹壁撤退反射(AWR)以评估内脏敏感性,观察肠道传输时间及粪便Bristol评分以评估肠道动力,ELISA检测肠道炎症细胞因子浓度.结果PI-IBS组、诱导组HSP70表达量较正常对照组明显升高(P＜0.01),诱导+PI-IB组较PI-IBS组亦明显丹高(P＜0.01).PI-IBS组肠道炎症评分明显高于正常对照组(P＜0.01),而诱导+PI-IBS组明显低于PI-IBS组(P＜0.01),诱导组与正常对照组差异无统计学意义(P＞0.05).PI-IBS组AWR评分明显高于正常对照组(P＜0.01),诱导+ PI-IBS组明显低于PI-IBS组(P＜0.01),诱导组与正常对照组差异无统计学意义(P＞0.05).PI-IBS组肠道传输时间比正常对照组明显缩短(P＜0.01),而诱导+P[-IBS组明显长于PI-IBS组(P＜0.01),诱导组与正常对照组差异无统计学意义(P＞0.05);PI-IBS组Bristol评分比正常对照组明显升高(P＜0.01),而诱导+ PI-IBS组明显低于PI-IBS组(P＜0.01),诱导组与正常对照组差异无统计学意义(P＞0.05).与正常对照组比较,PI-IBS组IL-10浓度明显降低(P＜0.01),而IL-17、IFN-γ、TNF-α浓度均明显升高(P＜0.01);与PI-IBS组比较,诱导+PI-IB组IL-10浓度明显升高(P＜0.01),而IL-17、IFN-γ、TNF-α浓度均明显降低(P＜0.01);诱导组与正常对照组IL-10、IL-17、IFN-γ、TNF-α浓度差异均无统计学意义(P＞0.05).结论 诱导肠道HSP70可通过调节肠道炎症细胞因子平衡来改善PI-IBS时的炎症状态.     

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.     

热休克蛋白70对兔未成熟心肌和心肌间质的影响

目的: 探讨热休克蛋白70(HSP70)对未成熟心肌和心肌间质的影响. 方法:健康新生长耳大白兔12只随机分为2组. 对照组(C组):ip生理盐水0.4 mL,24 h后取离体心脏,常规建立Langendorff离体心脏灌注模型,灌注15 min转为工作心15 min后停灌45 min,恢复灌注15 min改为工作心30 min;实验组(E组):ip去甲肾上腺素, 24 h后取离体心脏,方法同对照组. 测定心肌细胞中HSP70含量、血流动力学指标、心肌含水量(MWC)、心肌肌酸激酶(CK)和乳酸脱氢酶(LDH)漏出率、三磷酸腺苷(ATP)含量、超氧化物歧化酶(SOD)和丙二醛(MDA)含量、心肌组织羟脯氨酸(HP)含量、内皮素(ET) 含量、心肌细胞内Ca2 含量、心肌线粒体Ca2 -ATPase活性及其Ca2 含量、心肌线粒体合成ATP能力[ATP]m,心肌超微结构. 结果:E组HSP70含量明显高于C组(P<0.01);MWC低于C组(P<0.05);ATP含量、SOD活性、心肌线粒体Ca2 -ATPase活性、[ATP]m, HP含量优于C组(P<0.01),MDA含量、CK, LDH漏出率、心肌细胞内Ca2 含量、心肌线粒体Ca2 含量、ET含量低于C组(P<0.01),心肌超微结构损伤较C组明显减轻. 结论:HSP70对缺血再灌注未成熟心肌和心肌间质具有明显的保护作用.     

热休克蛋白70反义寡核苷酸对肝癌细胞增殖及凋亡的影响

目的 探讨热休克蛋白70反义寡核苷酸(HSP70 ASODN)对肝癌细胞增殖、凋亡的影响及其可能机制.方法 合成特异性靶向HSP70 ASODN,并将其转染SMMC-7721细胞;四甲基噻唑蓝(MTT)法检测HSP70 ASODN对SMMC-7721细胞增殖的影响,计算生长抑制率;荧光显微镜观察细胞凋亡形态;流式细胞仪分析细胞周期分布,计算细胞增殖指数;免疫细胞化学观察细胞内HSP70、Bcl-2、Bax的表达.结果 ASODN组细胞生长抑制率明显高于正义寡核苷酸(NSODN)组、转染试剂对照组及空白对照组(P＜0.05);形态学观察到典型瘤细胞凋亡特征;流式细胞仪分析证实HSP70 ASODN主要阻止瘤细胞进入S期,细胞增殖指数下降,出现明显的凋亡峰;免疫细胞化学显示可降低细胞内HSP70、Bcl-2水平(P＜0.05),提升Bax水平(P＜0.05).结论 HSP70 ASODN可抑制人肝癌SMMC-7721细胞的增殖,诱导细胞的凋亡,可能机制为中和了HSP70和细胞周期调节蛋白间的相互作用,导致细胞周期阻滞,打破了肿瘤细胞逃逸凋亡平衡,促使细胞发生凋亡.     

他莫昔芬治疗乳腺癌异种移植瘤裸鼠子宫病理改变

目的 研究经他莫昔芬治疗后乳腺癌异种移植瘤裸鼠的子宫病理改变,及孕激素治疗是否会影响乳腺癌细胞的增生及他莫昔芬的治疗效果。方法 将25只裸鼠皮下植入雌二醇（estradiol,E2）缓释片（0.72 mg/60 d）,并建立MCF7乳腺癌细胞荷瘤模型,记录肿瘤体积,荷瘤43 d后,将裸鼠采用数字表法随机分为4个组,每组6只,分别为：安慰剂组、黄体酮组、他莫昔芬组、他莫昔芬联合黄体酮组。56 d后,处死裸鼠取瘤体及子宫,进行HE染色及肿瘤生长曲线绘制。结果 裸鼠肿瘤生长速度结果显示：与安慰剂组相比,单用黄体酮未促进乳腺癌的额外增生（P>0.05）,他莫昔芬治疗后,乳腺癌组织体积明显缩小（P<0.01）。裸鼠肿瘤HE染色可见：肿瘤组织较疏松,肿瘤细胞数量明显减少,可见坏死的肿瘤细胞及中性粒细胞和淋巴细胞浸润。子宫内膜HE染色结果显示,子宫腺体数目增多,腺细胞核大深染,部分出现异型性,出现子宫内膜不典型增生的病理改变。子宫腺体个数统计结果显示：与安慰剂组相比,经他莫昔芬治疗后的子宫内膜腺体数量增加明显（P<0.01）,单用孕激素子宫内膜腺体数量无明显增加（P>0.05）。结论 在乳腺癌异种移植瘤裸鼠中,他莫昔芬治疗后肿瘤体积明显缩小,但子宫腺体明显增加,呈不典型增生病理改变;单用孕激素未促进乳腺癌细胞明显增生,子宫内膜无明显增生,孕激素的应用不能拮抗他莫昔芬导致的子宫内膜不典型增生。     

Heat shock protein 70 expression in relation to apoptosis in primary bladder transitional cell carcinoma

Bladder carcinoma is the most common tumor in the urinary system. In 1996, a sampleinvestigation showed that bladder carcinoma, in which more than 90% was mainly primary bladder transitional cell carcinoma （BTCC）, was one of the ten highest mortality malignant tumors in China. Bladder carcinoma represented 2% of all malignant tumors and has the fifth most common malignancy in men in Europe and North America.     

多巴胺对缺血再灌注大鼠心肌热休克蛋白表达的影响

目的：检测心肌细胞缺血再灌注（IR）过程中热休克蛋白70（HSP70）的表达，探讨多巴胺对HSP70表达的影响。方法：不同时间阻断Wistar大鼠冠状动脉的前降支，用合多巴胺或生理盐水的灌注液再灌注5h后，取出心脏前降支支配区的全层心肌组织；用Westen Blot方法检测HSP70的表达。结果：心肌细胞的HSP70袁达随缺血时间的延长而增加。缺血30min时表达最高，其后逐渐减少；灌注液含多巴胺的实验组较相同缺血时间的灌注生理盐水的对照组HSP70衷达均有明显增加（P〈0．05）。结论：心肌HSP70表达与心肌缺血相关，且呈时间依赖性，最走缺血耐受时间为30min左右。多巴胺在心肌缺血再灌注过程中促进HSP70的表达。     

重组人热休克蛋白70D的免疫佐剂样效应研究

目的：研究重组人热休克蛋白70D(rhHSP70D)蛋白的免疫佐剂样效应。方法：用rhHSP70D诱导体外培养的树突状细胞（DC），观察DC分泌前炎性细胞因子的水平、DC成熟及刺激同种异体淋巴细胞增殖的能力；用rhHSP70D与OVA257-264体外交联的蛋白免疫C57BL/6小鼠，观察能否诱导产生抗原特异性免疫保护作用。结果：rhHSP70D可以明显刺激DC分泌IL-1β、IL-12p70、TNF-α等细胞因子，可以促进DC表达HLA-DR、CD86、CD40等膜分子，增强DC诱导同种异体T淋巴细胞增殖的能力；rhHSP70D-OVA257-264交联蛋白可诱导小鼠产生具有明显抗原特异性的免疫保护作用，而rhHSP70D或OVA257-264单独免疫小鼠均不能产生这种保护作用。结论：rhHSP70D能通过促进DC成熟、刺激前炎性细胞因子的分泌增强DC的免疫激发功能，rhHSP70D-抗原肽复合物免疫能够诱导产生抗原特异性的免疫保护作用，提示rhHSP70D有望作为一种新的佐剂应用于抗肿瘤及抗感染免疫治疗。