目的构建抑制大鼠ERp29基因表达的重组质粒,并在IEC-6细胞中发挥作用。方法根据大鼠ERp29的基因序列,设计合成含有发夹结构的寡核苷酸片段,经退火形成双链后克隆至pAVU6+27载体质粒中,对阳性重组子进行酶切和测序鉴定后转染正常IEC-6细...目的构建抑制大鼠ERp29基因表达的重组质粒,并在IEC-6细胞中发挥作用。方法根据大鼠ERp29的基因序列,设计合成含有发夹结构的寡核苷酸片段,经退火形成双链后克隆至pAVU6+27载体质粒中,对阳性重组子进行酶切和测序鉴定后转染正常IEC-6细胞,通过PCR方法对siERp29干扰片段进行鉴定,并采用W estern b lot检测ERp29蛋白水平的表达变化。结果重组质粒经双酶切后,有目的条带出现,提示ERp29干扰片段已克隆至pAVU6+27载体质粒中,DNA测序结果显示插入序列与预先设计完全一致。重组质粒转染IEC-6细胞后经G418筛选,成功获得阳性克隆,W estern b lot结果显示ERp29的蛋白水平表达显著下降。结论成功构建ERp29基因RNA干扰表达质粒,并在IEC-6细胞中发挥抑制作用,这为深入研究该基因在电离辐射中的作用奠定了基础。展开更多
BACKGROUND: Gallbladder cancer (GBC) is one of the most aggressive malignant neoplasms with an extremely poor prognosis. Early diagnosis significantly increases the survival rate. The present study was undertaken to e...BACKGROUND: Gallbladder cancer (GBC) is one of the most aggressive malignant neoplasms with an extremely poor prognosis. Early diagnosis significantly increases the survival rate. The present study was undertaken to evaluate the diagnostic and prognostic value of sphingosine-1-phosphate receptor 1 (S1P1) and endoplasmic reticulum protein 29 (ERp29) in benign and malignant gallbladder lesions and to develop a possible alternative treatment for GBC. METHODS: A total of 100 gallbladder adenocarcinoma, 46 peritumoral, 30 gallbladder adenomatous, 15 gallbladder polyp and 35 chronic cholecystitis tissues were included. S1P1 and ERp29 expressions were evaluated by immunohistochemistry The correlation between S1P1 and ERp29 expression and tumor pathological features and prognosis was analyzed. RESULTS: S1P1 positive rate was significantly higher in gallbladder adenocarcinomas than that in peritumoral adenomatous, polyp, and chronic cholecystitis tissues. On the contrary, ERp29 positive rate was significantly lower in adenocarcinomas than that in peritumoral, adenomatous polyp, and chronic cholecystitis tissues. Benign lesions with positive S1P1 or negative ERp29 expression showed moderate or severe atypical hyperplasia in the gallbladder epithelium The overexpression of S1P1 or non-expression of ERp29 was significantly associated with tumor differentiation, tumor mass, lymph node metastasis, and adenocarcinoma invasion Univariate Kaplan-Meier analysis showed that the elevated S1P1 (P=0.008) or absence of ERp29 (P=0.043) was closely associated with decreased survival rate. Multivariate Cox regression analysis showed that S1P1 positive (P=0.004) or ERp29 negative (P=0.029) was an independent predictor of poor prognosis in gallbladder adenocarcinoma.CONCLUSION: S1P1 overexpression or ERp29 absence is related to the carcinogenesis and progression, and may be potential biomarkers for early detection of gallbladder adenocarcinoma.展开更多
目的对在BALB/c小鼠附睾精子中内质网蛋白29(endoplasmic reticulum protein 29,ERp29)进行鉴定以及定位。方法应用免疫印迹方法鉴定BALB/c小鼠附睾头、尾部精子ERp29蛋白,同时利用激光共聚焦显微镜和间接免疫荧光定位的方法研究ERp29...目的对在BALB/c小鼠附睾精子中内质网蛋白29(endoplasmic reticulum protein 29,ERp29)进行鉴定以及定位。方法应用免疫印迹方法鉴定BALB/c小鼠附睾头、尾部精子ERp29蛋白,同时利用激光共聚焦显微镜和间接免疫荧光定位的方法研究ERp29在附睾头、尾部精子上的定位。结果证实ERp29蛋白存在于BALB/c小鼠附睾头部和尾部精子中,且其在尾部精子中含量较头部明显增高。ERp29蛋白主要定位于BALB/c小鼠附睾头部精子的头部前端,而在附睾尾部精子则主要定位于头部和尾部主段。结论通过对ERp29蛋白在BALB/c小鼠附睾头部和尾部精子上的鉴定和定位,可以帮助进一步研究该蛋白对小鼠精子的作用。展开更多
目的通过相关分子生物学手段了解重要的内质网蛋白之一——内质网蛋白29(endoplasmic reticulum protein 29,ERp29)对人上皮性卵巢癌细胞顺铂化疗敏感性的影响。方法通过免疫组织化学法检测人卵巢癌组织中ERp29的表达情况。利用分子生...目的通过相关分子生物学手段了解重要的内质网蛋白之一——内质网蛋白29(endoplasmic reticulum protein 29,ERp29)对人上皮性卵巢癌细胞顺铂化疗敏感性的影响。方法通过免疫组织化学法检测人卵巢癌组织中ERp29的表达情况。利用分子生物学手段下调ERp29的表达,RT-PCR及Western blot验证其表达水平,CCK-8及流式细胞术(FACS)分析上述卵巢癌细胞株顺铂敏感性及细胞周期等改变。结果在化疗耐药和化疗敏感的上皮性卵巢癌组织中,ERp29的表达水平存在较为显著的差异(P<0.05);转染ERp29-siRNA后,ERp29 mRNA和蛋白表达水平均显著降低,与对照组相比,差异均具有统计学意义(均P<0.05);CCK-8及FACS检测结果提示:转染ERp29-siRNA后,A2780细胞对顺铂的敏感性明显下降(P<0.05);FACS检测结果显示:顺铂(4μmol/L)处理细胞24 h后,与对照组相比,ERp29-siRNA组G_0/G_1期细胞比例明显降低,与对照组相比差异有统计学意义(P<0.05);S期及G_2/M期细胞比例增加,与对照组相比差异均具有统计学意义(均P<0.05)。结论ERp29可能在人上皮性卵巢癌顺铂化疗耐药过程中发挥重要作用。展开更多
Abstract The unfolded protein response(UPR)is an important protective and compensatory strategy used during endoplasmic reticulum stress caused by factors including glucose starvation,low pH,or heat shock.However,ther...Abstract The unfolded protein response(UPR)is an important protective and compensatory strategy used during endoplasmic reticulum stress caused by factors including glucose starvation,low pH,or heat shock.However,there is very little information on the possible role(s)of the UPR under adverse conditions experienced by marine invertebrates.We observed that rough endoplasmic reticulum(ER)was dramatically expanded and numerous autophagosomes were accumulated in the intestinal cells of sea cucumbers,Apostichopus japonicus,under heat stress(4 h at 25°C compared with 15°C controls).Moreover,heat stress led to sharp increases in the relative transcript and protein expression levels of two primary ER chaperones:the endoplasmic reticulum resident protein 29-like(ERP29)and protein disulfi de-isomerase A6-like(PDIA6).These results suggest a potential adaptive mechanism to deal with heat-induced stress in sea cucumber intestine.展开更多
文摘目的构建抑制大鼠ERp29基因表达的重组质粒,并在IEC-6细胞中发挥作用。方法根据大鼠ERp29的基因序列,设计合成含有发夹结构的寡核苷酸片段,经退火形成双链后克隆至pAVU6+27载体质粒中,对阳性重组子进行酶切和测序鉴定后转染正常IEC-6细胞,通过PCR方法对siERp29干扰片段进行鉴定,并采用W estern b lot检测ERp29蛋白水平的表达变化。结果重组质粒经双酶切后,有目的条带出现,提示ERp29干扰片段已克隆至pAVU6+27载体质粒中,DNA测序结果显示插入序列与预先设计完全一致。重组质粒转染IEC-6细胞后经G418筛选,成功获得阳性克隆,W estern b lot结果显示ERp29的蛋白水平表达显著下降。结论成功构建ERp29基因RNA干扰表达质粒,并在IEC-6细胞中发挥抑制作用,这为深入研究该基因在电离辐射中的作用奠定了基础。
文摘目的:探讨泛素-蛋白酶体系统(UPS)功能障碍诱发帕金森病(PD)细胞模型的作用机制,为深入研究PD的发病机制提供理论依据。方法:建立PSI诱导的PC12细胞模型,实验组、对照组分别加入PSI和DMSO(终浓度为10μmol.L-1)孵育36 h后提取蛋白,应用荧光差异凝胶电泳(DIGE)系统获得差异蛋白点,运用基质辅助激光解吸/电离飞行时间质谱仪(MALDI-TOF Pro MS)鉴定出差异蛋白。结果:实验组与对照组比较,在36 h可见细胞内嗜酸性类Lewy小体形成及细胞凋亡(细胞核呈固缩状或碎裂状),凋亡百分率为25.53%。实验组内质网蛋白ERp29与对照组比较表达量显著降低,差异有显著性(P<0.01)。结论:内质网应激(ERS)在UPS功能障碍引起PD的病理变化过程中起重要作用。
基金supported by grants from the National Science Foundation of China (No. 81410292)the Natural Science Foundation of Hunan Province (No. 09JJ3077)
文摘BACKGROUND: Gallbladder cancer (GBC) is one of the most aggressive malignant neoplasms with an extremely poor prognosis. Early diagnosis significantly increases the survival rate. The present study was undertaken to evaluate the diagnostic and prognostic value of sphingosine-1-phosphate receptor 1 (S1P1) and endoplasmic reticulum protein 29 (ERp29) in benign and malignant gallbladder lesions and to develop a possible alternative treatment for GBC. METHODS: A total of 100 gallbladder adenocarcinoma, 46 peritumoral, 30 gallbladder adenomatous, 15 gallbladder polyp and 35 chronic cholecystitis tissues were included. S1P1 and ERp29 expressions were evaluated by immunohistochemistry The correlation between S1P1 and ERp29 expression and tumor pathological features and prognosis was analyzed. RESULTS: S1P1 positive rate was significantly higher in gallbladder adenocarcinomas than that in peritumoral adenomatous, polyp, and chronic cholecystitis tissues. On the contrary, ERp29 positive rate was significantly lower in adenocarcinomas than that in peritumoral, adenomatous polyp, and chronic cholecystitis tissues. Benign lesions with positive S1P1 or negative ERp29 expression showed moderate or severe atypical hyperplasia in the gallbladder epithelium The overexpression of S1P1 or non-expression of ERp29 was significantly associated with tumor differentiation, tumor mass, lymph node metastasis, and adenocarcinoma invasion Univariate Kaplan-Meier analysis showed that the elevated S1P1 (P=0.008) or absence of ERp29 (P=0.043) was closely associated with decreased survival rate. Multivariate Cox regression analysis showed that S1P1 positive (P=0.004) or ERp29 negative (P=0.029) was an independent predictor of poor prognosis in gallbladder adenocarcinoma.CONCLUSION: S1P1 overexpression or ERp29 absence is related to the carcinogenesis and progression, and may be potential biomarkers for early detection of gallbladder adenocarcinoma.
文摘目的对在BALB/c小鼠附睾精子中内质网蛋白29(endoplasmic reticulum protein 29,ERp29)进行鉴定以及定位。方法应用免疫印迹方法鉴定BALB/c小鼠附睾头、尾部精子ERp29蛋白,同时利用激光共聚焦显微镜和间接免疫荧光定位的方法研究ERp29在附睾头、尾部精子上的定位。结果证实ERp29蛋白存在于BALB/c小鼠附睾头部和尾部精子中,且其在尾部精子中含量较头部明显增高。ERp29蛋白主要定位于BALB/c小鼠附睾头部精子的头部前端,而在附睾尾部精子则主要定位于头部和尾部主段。结论通过对ERp29蛋白在BALB/c小鼠附睾头部和尾部精子上的鉴定和定位,可以帮助进一步研究该蛋白对小鼠精子的作用。
基金Supported by the National Natural Science Foundation of China(No.41676124)。
文摘Abstract The unfolded protein response(UPR)is an important protective and compensatory strategy used during endoplasmic reticulum stress caused by factors including glucose starvation,low pH,or heat shock.However,there is very little information on the possible role(s)of the UPR under adverse conditions experienced by marine invertebrates.We observed that rough endoplasmic reticulum(ER)was dramatically expanded and numerous autophagosomes were accumulated in the intestinal cells of sea cucumbers,Apostichopus japonicus,under heat stress(4 h at 25°C compared with 15°C controls).Moreover,heat stress led to sharp increases in the relative transcript and protein expression levels of two primary ER chaperones:the endoplasmic reticulum resident protein 29-like(ERP29)and protein disulfi de-isomerase A6-like(PDIA6).These results suggest a potential adaptive mechanism to deal with heat-induced stress in sea cucumber intestine.
