Prognosis value of heat-shock proteins in esophageal and esophagogastric cancer:A systematic review and meta-analysis

BACKGROUND Heat shock proteins(HSPs)are molecular chaperones that play an important role in cellular protection against stress events and have been reported to be overex-pressed in many cancers.The prognostic significance of HSPs and their regulatory factors,such as heat shock factor 1(HSF1)and CHIP,are poorly understood.AIM To investigate the relationship between HSP expression and prognosis in esophageal and esophagogastric cancer.METHODS A systematic review was conducted in accordance with PRISMA recommend-ations(PROSPERO:CRD42022370653),on Embase,PubMed,Cochrane,and LILACS.Cohort,case-control,and cross-sectional studies of patients with eso-phagus or esophagogastric cancer were included.HSP-positive patients were compared with HSP-negative,and the endpoints analyzed were lymph node metastasis,tumor depth,distant metastasis,and overall survival(OS).HSPs were stratified according to the HSP family,and the summary risk difference(RD)was calculated using a random-effect model.RESULTS The final selection comprised 27 studies,including esophageal squamous cell carcinoma(21),esophagogastric adenocarcinoma(5),and mixed neoplasms(1).The pooled sample size was 3465 patients.HSP40 and 60 were associated with a higher 3-year OS[HSP40:RD=0.22;95%confidence interval(CI):0.09-0.35;HSP60:RD=0.33;95%CI:0.17-0.50],while HSF1 was associated with a poor 3-year OS(RD=-0.22;95%CI:-0.32 to-0.12).The other HSP families were not associated with long-term survival.HSF1 was associated with a higher probability of lymph node metastasis(RD=-0.16;95%CI:-0.29 to-0.04).HSP40 was associated with a lower probability of lymph node dissemination(RD=0.18;95%CI:0.03-0.33).The expression of other HSP families was not significantly related to tumor depth and lymph node or distant metastasis.CONCLUSION The expression levels of certain families of HSP,such as HSP40 and 60 and HSF1,are associated with long-term survival and lymph node dissemination in patients with esophageal and esophagogastric cancer.

Cryopreservation-induced decrease in heat-shock protein 90 in human spermatozoa and its mechanism

<abstract>Aim: To study the protein changes of spermatozoa associated with sperm motility during sperm cryopreservation and its mechanism. Methods: In 18 healthy men, the seminal sperm motility and HSP90 levels were studied before and after cryopreservation using SDS-PAGE, Western blotting and computerized image analysis. Results: The sperm motility declined significantly after cryopreservation (P<0.01). The average grey level and the integrated grey level of sperm HSP90 before cooling were 34.1±3.2 and 243.0±21.6, respectively, while those after thawing were 23.2±2.5 and 105.7±28.5, respectively. Both parameters were decreased significantly (P<0.01). No HSP90 was found in the seminal plasma before and after cryopreservation. Conclusion: HSP90 in human spermatozoa was decreased substantially after cryopreservation. This may result from protein degradation, rather than leakage into the seminal plasma.

Preliminary study of the role of inner ear proteins in vestibular neuritis

Objective:To evaluate the plasma levels of the otoconial proteins,otoconin-90 and otolin-1,in individuals diagnosed with vestibular neuritis(VN)and determine the feasibility of using these proteins as biomarkers for VN.Methods:In this preliminary study,30 patients diagnosed with VN and 70 healthy individuals were recruited and followed to confirm whether they had benign paroxysmal positional vertigo(BPPV)during the following time.The recorded data included measurements of height,weight,and history of diabetes mellitus or hypertension.Additionally,levels of plasma otoconin-90,and otolin-1 were measured and compared.Results:The plasma concentrations of otoconin-90 and otolin-1 may not be significantly different between patients with VN and healthy controls,nor among patients with BPPV secondary to VN and patients with VN without BPPV.Conclusions:Plasma otoconin-90 and otolin-1 levels may not serve as biomarkers of acute VN episodes or predict BPPV occurrence secondary to VN.

Hepatitis C virus inhibitor synergism suggests multistepinteractions between heat-shock protein 90 and hepatitis Cvirus replication

AIM: To address the effect of heat-shock protein 90(HSP90) inhibitors on the release of the hepatitis C virus(HCV), a cell culture-derived HCV(JFH1/HCVcc) from Huh-7 cells was examined.METHODS: We quantified both the intracellular and extracellular(culture medium) levels of the components(RNA and core) of JFH-1/HCVcc. The intracellular HCV RNA and core levels were determined after the JFH1/HCVcc-infected Huh-7 cells were treated with radicicol for 36 h. The extracellular HCV RNA and core protein levels were determined from the medium of the last 24 h of radicicol treatment. To determine the possible role of the HSP90 inhibitor in HCV release, we examined the effect of a combined application of low doses of the HSP90 inhibitor radicicol and the RNA replication inhibitors cyclosporin A(Cs A) or interferon. Finally, we statistically examined the combined effect of radicicoland Cs A using the combination index(CI) and graphical representation proposed by Chou and Talalay.RESULTS: We found that the HSP90 inhibitors had greater inhibitory effects on the HCV RNA and core protein levels measured in the medium than inside the cells. This inhibitory effect was observed in the presence of a low level of a known RNA replication inhibitor(Cs A or interferon-α). Treating the cells with a combination of radicicol and cyclosporin A for 24 h resulted in significant synergy(CI < 1) that affected the release of both the viral RNA and the core protein. CONCLUSION: In addition to having an inhibitory effect on RNA replication, HSP90 inhibitors may interfere with an HCV replication step that occurs after the synthesis of viral RNA, such as assembly and release.

热休克蛋白90对hERG-A561V通道蛋白转运及通道功能影响的研究

目的探讨热休克蛋白90(Hsp90)对人类ether-a-go-go相关基因(hERG)-A561V通道蛋白转运及通道功能影响的研究。方法构建野生型(WT)、突变型(A561V)、杂合型(WT/A561V)细胞模型,采用蛋白质印迹法检测各组细胞hERG及Hsp90蛋白表达差异。转染减表达空载(Itf NC)、Hsp90减表达(Hsp90-)、过表达空载(Ovp NC)或Hsp90过表达(Hsp90+)质粒至各细胞模型(即Itf NC组、Hsp90-组、Ovp NC组、Hsp90+组),另设不加载体的对照(Ctl)组,采用蛋白质印迹法检测各组细胞调控Hsp90前后hERG及Hsp90蛋白表达差异。采用免疫荧光法检测Hsp90调控前后杂合型细胞模型hERG及Hsp90蛋白定位表达情况。采用全细胞膜片钳技术检测调控Hsp90前后杂合型细胞模型hERG通道激活电流及尾电流密度。结果突变型、杂合型细胞模型Hsp90及hERG(135 kDa)蛋白表达水平均较野生型明显升高(均P<0.05)。野生型细胞模型Hsp90+组hERG(135 kDa)、hERG(155 kDa)蛋白表达水平较Ctl组、Ovp NC组均明显升高(均P<0.05),突变型细胞模型Hsp90+组hERG(135 kDa)蛋白表达水平较Ctl组、Ovp NC组均明显升高(均P<0.05),杂合型细胞模型Hsp90+组hERG(155 kDa)蛋白表达水平较Ctl组、Ovp NC组均明显升高(均P<0.05)。融合Hsp90和hERG蛋白后,Ctl组hERG表达于细胞膜、细胞质,Hsp90-组细胞膜上hERG蛋白表达减少,Hsp90+组细胞膜上hERG蛋白表达增多。与Ctl组比较,Hsp90+组Ikr曲线左移14.709,斜率因子k值未见明显变化。杂合型细胞模型Ctl组、Hsp90-组、Hsp90+组激活电流及尾电流密度均在50 mV处达到最高;杂合型细胞模型Hsp90+组在20、30 mV处的激活电流密度均明显高于Ctl组、Hsp90-组(均P<0.05),在30、40 mV处的尾电流密度均明显高于Ctl组、Hsp90-组(均P<0.05)。结论Hsp90在hERG-A561V通道蛋白折叠转运中起作用,而上调Hsp90可促进WT/A561V hERG的折叠转运,进而影响通道功能。

Altered expression of nuclear matrix proteins in etoposide induced apoptosis in HL-60 cells

The events of cell death and the expression of nuclear matrix protein (NMP) have been investigated in a promyelocytic leukemic cell line HL-60 induced with etoposide. By means of TUNEL assay, the nuclei displayed a characteristic morphology change, and the amount of apoptotic cells increased early and reached maximun about 39% after treatment with etoposide for 2 h. Nucleosomal DNA fragmentation was observed after treatment for 4 h. The morphological change of HL-60 cells, thus, occurred earlier than the appearance of DNA ladder. Total nuclear matrix proteins were analyzed by 2-dimensional gel electrophoresis. Differential expression of 59 nuclear matrix proteins was found in 4 h etoposide treated cells. Western blotting was then performed on three nuclear matrix acssociated proteins, PML, HSC70 and NuMA. The expression of the suppressor PML protein and heat shock protein HSC70 were significantly upregulated after etoposide treatment, while NuMA, a nuclear mitotic apparatus protein, was down regulated. These results demonstrate that significant biochemical alterations in nuclear matrix proteins take place during the apoptotic process.

Effects of moxibustion on heat-shock protein 70 expression in the spinal cord and colonic mucosa in a rat model of ulcerative colitis

Pathological changes in the colon are closely associated with the spinal cord, and innervation of spinal cord can regulate cellular functions. Our previous studies verified that moxibustion protects and restores the colonic mucosa, but the mechanisms of action remain unknown. The present study observed the effects of moxibustion and salicylazosulfapyridine on expression of heat-shock protein 70 （HSP70） and its mRNA in the spinal cord and colonic mucosa of ulcerative colitis rats. Results demonstrated that moxibustion and salicylazosulfapyridine increased HSP70 mRNA expression in the spinal cord and colonic mucosa of ulcerative colitis rats. The decreased transcriptional activity of HSP70 in the spinal cord and colonic mucosa might participate in damage to the colonic mucosa in ulcerative colitis rats. Moxibustion exerted protective effects on colonic mucosa by up-regulating HSP70 transcriptional activity in the spinal cord and colonic mucosa.

Heat shock protein 90 promotes RNA helicase DDX5 accumulation and exacerbates hepatocellular carcinoma by inhibiting autophagy

Objective:Hepatocellular carcinoma(HCC),the main type of liver cancer,has a high morbidity and mortality,and a poor prognosis.RNA helicase DDX5,which acts as a transcriptional co-regulator,is overexpressed in most malignant tumors and promotes cancer cell growth.Heat shock protein 90(HSP90)is an important molecular chaperone in the conformational maturation and stabilization of numerous proteins involved in cell growth or survival.Methods:DDX5 m RNA and protein expression in surgically resected HCC tissues from 24 Asian patients were detected by quantitative real-time PCR and Western blot,respectively.The interaction of DDX5-HSP90 was determined by molecular docking,immunoprecipitation,and laser scanning confocal microscopy.The autophagy signal was detected by Western blot.The cell functions and signaling pathways of DDX5 were determined in 2 HCC cell lines.Two different murine HCC xenograft models were used to determine the function of DDX5 and the therapeutic effect of an HSP90 inhibitor.Results:HSP90 interacted directly with DDX5 and inhibited DDX5 protein degradation in the AMPK/ULK1-regulated autophagy pathway.The subsequent accumulation of DDX5 protein induced the malignant phenotype of HCC by activating theβ-catenin signaling pathway.The silencing of DDX5 or treatment with HSP90 inhibitor both blocked in vivo tumor growth in a murine HCC xenograft model.High levels of HSP90 and DDX5 protein were associated with poor prognoses.Conclusions:HSP90 interacted with DDX5 protein and subsequently protected DDX5 protein from AMPK/ULK1-regulated autophagic degradation.DDX5 and HSP90 are therefore potential therapeutic targets for HCC.

Heat shock and other apoptosis-related proteins as therapeutic targets in prostate cancer

Defects within apoptotic pathways have been implicated in prostate cancer （PCa） tumorigenesis, metastatic progression and treatment resistance. A hallmark of cancers is the ability to derail apoptosis by inhibiting the apoptotic signal, reducing the expression of apoptotic proteins and/or amplifying survival signals through increased production of antiapoptotic molecule. This review describes associations between heat shock proteins （HSPs） and the human androgen receptor （AR）, the role of HSPs and other stress-induced proteins in PCa development and emerging strategies in targeting these protective proteins to treat PCa.

Heat shock protein 90 is a potential therapeutic target for ameliorating skeletal muscle abnormalities in Parkinson's disease

Previous studies have confirmed that heat shock protein 90 overexpression can lead to dopami- nergic neuronal death. This study was designed to further investigate what effects are produced by heat shock protein 90 after endurance exercise training. Immunohistochemistry results showed that exercise training significantly inhibited heat shock protein 90 overexpression in the soleus and gastrocnemius in Parkinson＇s disease rats, which is a potential therapeutic target for ameliorating skeletal muscle abnormalities in Parkinso^s disease.

柔嫩艾美耳球虫热休克蛋白90和组蛋白4对DF-1细胞凋亡的影响

为了探究柔嫩艾美耳球虫热休克蛋白90(EtHSP90)和组蛋白(EtH4)在体外对鸡胚成纤维细胞(DF-1细胞)凋亡的影响,本试验构建真核荧光表达质粒pEGFP-N1-EtHSP90和pEGFP-N1-EtH4并转染至DF-1细胞,用荧光显微镜观察转染效果,Western blot验证蛋白表达,流式细胞术检测DF-1细胞凋亡。结果显示,经验证成功构建重组质粒pEGFP-N1-EtHSP90和pEGFP-N1-EtH4。流式细胞术检测发现,pEGFP-N1-EtHSP90组早期凋亡率显著低于空白组、pEGFP-N1组和pEGFP-N1-EtH4组(P<0.05);pEGFP-N1-EtH4组早期凋亡率与空白组和pEGFP-N1组相比差异不显著(P>0.05)。因此,EtHSP90早期可抑制细胞凋亡,EtH4既不促进细胞凋亡,也不抑制细胞凋亡。本试验结果为后续深入探究2个蛋白的凋亡机制提供理论基础。

Research Progress of Heat Shock Protein 90 and Hepatocellular Carcinoma

Heat shock protein (HSP) is a kind of protein that mainly acts as a molecular chaperone to participate in the synthesis and folding of proteins, maintain the spatial conformation of proteins and protect cells from damage and other important biological functions. HSP90 plays an important role in maintaining molecular chaperone structure, regulating cell cycle and apoptosis, coordinating hormone signal transduction and promoting wound healing. And HSP90 also plays an important role in the occurrence and progression of tumors. In recent years, HSP90 inhibitors have made some achievements in molecular targeted therapy for malignant tumors, but further research is needed in clinical application. In this paper, the research status of the relationship between hepatocellular carcinoma targeted by heat shock protein 90 was reviewed.

血清LTBP2、Ucn1、CD90水平在子宫内膜异位症诊断及病情严重程度评估中的价值

目的探讨血清转化生长因子结合蛋白2(LTBP2)、尿皮质醇1(Ucn1)、抗原分化簇90(CD90)水平在子宫内膜异位症(EMT)诊断及病情严重程度评估中的价值。方法选取2020年1月至2023年12月在该院进行诊断治疗的EMT患者103例作为实验组,按病情程度将实验组分为重度组与轻度组,另选取同期在该院体检的体检健康者82例作为对照组。采用Pearson分析血清LTBP2、Ucn1、CD90水平相关性,采用多因素Logistic回归分析影响EMT患病因素,通过受试者工作特征(ROC)曲线评价血清LTBP2、Ucn1、CD90对EMT的诊断价值。结果实验组与对照组比较,血清LTBP2、Ucn1、CD90水平呈显著升高的趋势(P<0.05)。实验组血清LTBP2、Ucn1、CD90之间呈正相关(r=0.377、0.344、0.246,P<0.001、<0.001、=0.012)。轻度组与重度组血清LTBP2、Ucn1、CD90水平均显著高于对照组患者,轻度组患者血清LTBP2、Ucn1、CD90水平显著低于重度组患者,差异有统计学意义(P<0.05)。实验组白细胞介素(IL)-4水平低于对照组,而经期疼痛及盆腔手术史占比高于对照组,差异有统计学意义(P<0.05)。血清LTBP2、Ucn1、CD90水平、经期疼痛、盆腔手术史是发生EMT的危险因素(P<0.05),IL-4水平是发生EMT的保护因素(P<0.05)。血清LTBP2、Ucn1、CD90及三者联合对EMT诊断的曲线下面积为0.788、0.801、0.810、0.916,灵敏度为63.11%、63.11%、62.14%、84.47%,三者联合(Z_(LTBP2-三者联合)=4.054、P<0.001,Z_(Ucn1-三者联合)=3.966、P<0.001,Z_(CD90-三者联合)=4.193、P<0.001)对EMT诊断价值更高。结论EMT病情程度较重者血清LTBP2、Ucn1、CD90水平较高,血清LTBP2、Ucn1、CD90联合对EMT具有一定诊断价值。

Combined Detection of Serum Heat Shock Protein-90<i>α</i>and Prostate Specific Antigen for Prostate Cancer Diagnosis

Objective: To explore the relationship between heat shock protein-90α (HSP-90α) and occurrence of prostate cancer, and clinical value of combined detection of serum HSP-90α and prostate specific antigen (PSA) in the diagnosis of prostate cancer. Method: A total of 30 patients with prostate cancer, 30 patients with benign prostatic hyperplasia (BPH) and 30 healthy men (control group) were selected from September 2018 to September 2019, then to detect levels of serum HSP-90α, total PSA and free PSA (FPSA) by ELISA, serum testosterone level by radioimmunoassay, prostate cancer tissue was removed by operation, and relative expression of tissue HSP-90α protein by Western blot. Results: The levels of serum HSP-90α and total PSA in prostate cancer group were significantly higher than other two groups, and testosterone level was lower than other two groups (P < 0.05);there was no difference of serum FPSA level between the three groups (P > 0.05). It was found by Pearson test that serum HSP-90α was positively correlated with total PSA level (r = 0.659, P = 0.005), while negatively correlated with testosterone level (r = -0.549, P = 0.006). According to TNM stage of prostate cancer, there were 17 cases of stage I - II, 13 cases of stage III - IV, 6 cases of Gleason score 1 - 4, 13 cases of 5 - 7, 11 cases of 8 - 10, tumor diameter range from 0.8 to 6.2 cm, with average of (3.9 ± 1.5) cm. The relative expression of HSP-90α protein in tumor tissue was closely related to TNM stage, Gleason score and tumor diameter (P < 0.05). By ROC analysis, it was found that accuracy of combined detection of serum HSP-90α and PSA levels for prostate cancer diagnosis was 0.896, and that of single PSA detection was 0.852. Conclusion: Higher expressions of HSP-90α in prostate cancer tissue and serum may be closely related to occurrence and development of prostate cancer, and combined detections of serum HSP-90α and PSA levels are of great significance in improving early diagnosis of prostate cancer.

吗啡后处理经miR-9-5p/HSP90调控线粒体自噬减轻心肌缺血再灌注损伤的机制研究

目的深入挖掘吗啡后处理(M postC)保护心肌缺血再灌注损伤(MI/RI)心肌的分子作用机制。方法选取42只雄性C57BL/6小鼠随机分为对照组、假手术组、MI/RI组、MI/RI+M postC组。建立MI/RI小鼠模型并给予M postC。2,3,5-三苯基四唑氯化物(TTC)染色检测小鼠心肌梗死体积。Ca^(2+)Green-5N荧光探针法检测小鼠左心室心肌组织来源线粒体通透性转换孔(mPTP)的开放。采用实时荧光定量聚合酶链反应检测左心室心肌组织中miR-9-5p和热休克蛋白90(HSP90)AA mRNA水平。Western blot试验检测左心室心肌组织中HSP90AA蛋白质及线粒体自噬相关蛋白因子PINK1和E 3泛素连接酶的蛋白质水平。生物信息学分析、双荧光素酶报告基因分析验证miR-9-5p和HSP90AA的序列互作。结果与假手术组比较,MI/RI组心肌梗死体积百分比增大,差异有统计学意义(P<0.05);与MI/RI组比较,MI/RI+M postC组心肌梗死体积百分比降低,差异有统计学意义(P<0.05)。与假手术组比较,MI/RI组的T组Ca^(2+)水平信号升高(P<0.05);与MI/RI组比较,MI/RI+M postC组的T组Ca^(2+)水平信号降低至基线水平(P<0.05)。与假手术组比较,MI/RI组左心室心肌组织miR-9-5p RNA相对表达水平升高(P<0.05),HSP90AA mRNA和蛋白质相对表达水平均降低(P<0.05),PINK1和E 3泛素连接酶蛋白质相对表达水平均升高(P<0.05)。与MI/RI组比较,MI/RI+M postC组左心室心肌组织miR-9-5p RNA相对表达水平降低(P<0.05),HSP90AA mRNA和蛋白质相对表达水平均升高(P<0.05),PINK1和E 3泛素连接酶蛋白质相对表达水平均升高(P<0.05)。与共转染miR-9-5p mimic和HSP90AA-MUT的细胞比较,共转染miR-9-5p mimic和HSP90AA-WT的细胞内荧光素酶活性降低,差异无统计学意义(P>0.05)。结论M postC经miR-9-5p/HSP90轴可促进线粒体自噬,减轻心肌缺血再灌注损伤。

高危型HPV阳性患者血清中HDAC6和Hsp90联合检测在宫颈癌前病变诊断中的临床意义

目的探究高危型人乳头瘤病毒(HR-HPV)阳性患者血清中组蛋白脱乙酰酶6(HDAC6)和热休克蛋白90(Hsp90)联合检测在宫颈癌前病变诊断中的临床意义。方法纳入2020年6月至2021年6月在山东第一医科大学附属济南妇幼保健院接受治疗的166例HR-HPV阳性患者作为研究对象,根据阴道镜检查和活检结果将研究对象分为实验组[高级别鳞状上皮内病变(HSIL)56例、低级别鳞状上皮内病变(LSIL)30例]、对照组(子宫颈良性病变患者80例)。采用酶联免疫吸附试验(ELISA)法检测患者血清HDAC6、Hsp90水平;采用Logistic多因素回归分析HR-HPV患者发生宫颈癌前病变的影响因素;采用受试者工作特征(ROC)曲线评价血清HDAC6、Hsp90对HR-HPV患者发生宫颈癌前病变的诊断价值。结果相较于对照组,实验组吸烟、有盆腔炎病史及性传播疾病感染史患者占比和白细胞、中性粒细胞、白介素-6(IL-6)、白介素-1β(IL-1β)、肿瘤坏死因子-α(TNF-α)、C反应蛋白(CRP)、HDAC6、Hsp90水平显著升高(P<0.05)。Logistic多因素回归分析显示,性传播疾病感染史及IL-6、IL-1β、TNF-α、CRP、HDAC6、Hsp90水平均是HR-HPV阳性患者发生宫颈癌前病变的独立危险因素(P<0.05)。ROC曲线结果显示,血清HDAC6、Hsp90水平及二者联合预测HR-HPV阳性患者发生宫颈癌前病变的曲线下面积(AUC)分别为0.759、0.774、0.870,其中联合预测的AUC显著高于二者单独预测的AUC(Z=2.361、2.042,P<0.05)。HSIL患者IL-6、IL-1β、TNF-α、CRP、HDAC6、Hsp90水平显著高于LSIL患者(P<0.05)。结论血清HDAC6、Hsp90在HR-HPV阳性发生宫颈癌前病变患者中水平升高,均是HR-HPV阳性患者发生宫颈癌前病变的独立危险因素,有望成为HR-HPV阳性患者发生宫颈癌前病变的诊断因子。

取食不同寄主植物对绿盲蝽热激蛋白AlHSP90表达的影响

绿盲蝽热激蛋白90基因AlHSP90是绿盲蝽体内重要的抗逆基因,参与绿盲蝽耐受高温、杀虫剂等胁迫反应。为了明晰绿盲蝽取食不同寄主植物后其体内抗逆基因的表达特征,本试验通过荧光定量PCR和Western杂交技术,重点分析AlHSP90基因及其蛋白在绿盲蝽取食不同寄主植物后的表达谱。结果表明:绿盲蝽雌、雄成虫取食Bt棉、常规棉后,AlHSP90表达量显著高于取食其他寄主植物(P<0.01);与对照四季豆相比,取食茼蒿之后AlHSP90表达量无显著变化(P>0.05)。雌成虫取食Bt棉、常规棉后,AlHSP90表达量分别比对照上升了1.77、1.74倍;而雄成虫取食Bt棉、常规棉后,AlHSP90表达量则分别比对照上升了1.98、1.94倍。取食不同寄主植物之后,AlHSP90蛋白的表达谱结果与其基因的表达谱结果高度相似。绿盲蝽雌、雄成虫取食Bt棉、常规棉后,AlHSP90蛋白表达量显著高于取食其他寄主植物(P<0.01);而取食茼蒿之后,AlHSP90蛋白表达量无显著变化(P>0.05)。由此可见,AlHSP90基因是绿盲蝽适应棉花取食过程中重要的抗逆基因,并在绿盲蝽寄主转换过程中起到重要作用。

肉鸡组织脏器的急性热应激损伤及HSP_(90)的表达

将 30日龄AA肉鸡在 ( 4 0± 1)℃高温中分别持续 2、 3、 5和 10h ,定期剖杀 ,进行临床血液病理学、组织病理学和免疫组织化学检测。结果表明 :在热应激 2～ 5h内 ,受试鸡外周血液中肌酸激酶活性持续升高 (P <0 0 1) ;当热应激持续到 10h时其活性出现降低 ,但仍明显高于对照组 (P <0 0 1)。受试鸡的组织脏器在应激前期损伤较严重 ,热应激 2～ 5h内 ,各主要脏器组织如心肌纤维、肝细胞、肾小管上皮细胞出现颗粒变性和脂肪变性 ,甚至坏死 ;而后期组织细胞的损伤则无明显坏死。提示在热应激持续一定时间后 ,机体可通过自身调节逐渐获得对高热的耐受能力。免疫组化结果显示 ,HSP90 广泛分布在热应激受试鸡脏器组织细胞的胞浆和胞核中 ,尤其在组织的小动脉、毛细血管内皮细胞内呈现强表达。提示血管壁中HSP90 可能通过血管的舒缩而影响组织器官的血液供应。

NSCLC组织中Hsp90α的表达及其临床意义

目的:探讨热休克蛋白90α(Hsp90α)在非小细胞肺癌(NSCLC)中的表达及其临床意义。方法:采用免疫组织化学S-P方法检测50例非小细胞肺癌组织中Hsp90α的表达,分析其表达与临床病理特征及放疗预后的关系。结果:Hsp90α主要表达于细胞浆,阳性表达为78%(39/50),Hsp90α的表达与TNM分期、远处转移、淋巴结转移有关(P<0.05),与组织学分级、病理类型及年龄、性别无关。Hsp90α阳性和阴性表达组放疗有效率、1、2、3年生存率分别为65.8%(25/39)、71.8%、34.2%、3.1%和81.8%(9/11)、76.2%、45.7%、30.5%,Log-Rank检验两组生存曲线有非常显著差异(P=0.009)。结论:Hsp90α在非小细胞肺癌组织中高表达,其高表达与NSCLC的放射抗拒性密切相关。

热休克蛋白90——癌症治疗的新靶点

热休克蛋白90(heatshockprotein90,Hsp90)作为分子伴侣参与调控、维持细胞内多种蛋白的构象和功能,以帮助细胞在应激环境刺激下正常生长。近年来研究表明很多癌基因蛋白均为Hsp90的作用靶点,因此抑制Hsp90的功能将促进这些癌基因蛋白的降解,有助于癌症治疗。体内外实验也证实了Hsp90抑制剂的抗肿瘤活性,其中17-烯丙胺-17-脱甲氧格尔德霉素(17-allylamio-17-desmethoxygeldanamycin,17-AAG)正在进行临床试验。