目的探讨神经毒素6-羟基多巴胺(6-OHDA)诱导PC12细胞的帕金森(PD)模型中GRP78的表达。方法在建立6-OHDA诱导PC12细胞帕金森模型的基础上,MTT法测细胞存活率和Hoechst33342染色检测细胞凋亡。分别提取6-OHDA处理组和对照组细胞总蛋白,应...目的探讨神经毒素6-羟基多巴胺(6-OHDA)诱导PC12细胞的帕金森(PD)模型中GRP78的表达。方法在建立6-OHDA诱导PC12细胞帕金森模型的基础上,MTT法测细胞存活率和Hoechst33342染色检测细胞凋亡。分别提取6-OHDA处理组和对照组细胞总蛋白,应用荧光差异凝胶电泳(Differentia Gel Electrophoresis,DIGE)技术获得蛋白点的差异表达信息,运用MALDI-TOF质谱鉴定出差异蛋白质。结果实验组细胞存活率为60%±4.8%,与对照组比较显著下降(P<0.05)。荧光染色可见细胞核呈固缩状或碎裂状的典型的凋亡形态学改变。DIGE分析发现6-OHDA组表达明显增高的一个蛋白质点,经质谱分析鉴定确认为GRP78。结论6-OHDA能够诱导PC12细胞凋亡,凋亡过程中GRP78表达增高,提示GRP78增高可能与PD的发病机制有关。展开更多
目的:筛选心肌缺血相关的蛋白质,以期发现心肌缺血特征性的差异蛋白质或蛋白质群。方法:对模型动物小型猪施行冠脉Ameroid环缩术,通过对模型动物的动态观察,综合评价,并参照WHO冠心病心绞痛诊断标准,明确术后28天符合心肌缺血诊断。术...目的:筛选心肌缺血相关的蛋白质,以期发现心肌缺血特征性的差异蛋白质或蛋白质群。方法:对模型动物小型猪施行冠脉Ameroid环缩术,通过对模型动物的动态观察,综合评价,并参照WHO冠心病心绞痛诊断标准,明确术后28天符合心肌缺血诊断。术后28天,动物前腔静脉取血,血样处理后进行荧光差异蛋白电泳(2D-DIGE),对差异蛋白点进行MALDI-TOF/TOF分析,获取蛋白样品的肽质量指纹图。结果:共筛选出31个差异表达蛋白质点,其中17个蛋白质点在4周模型组中下调,14个蛋白点上调。对其中15个蛋白点采用质谱技术成功鉴定。白蛋白、血红素蛋白、烟酸受体在4周模型组中低表达,CH4 and secrete domain of Swine IgM、mutated immunoglobulin heavy chain、肌球蛋白、磷脂酶C、白细胞抗原相关酪蛋白磷酸酶相关蛋白、磷酸核糖焦磷酸相关蛋白-1、Ig gamma 4 chain constant region在4周模型组中高表达。结论:初步发现碱性磷酸酶、肌球蛋白、白细胞抗原相关酪蛋白磷酸酶相关蛋白、磷酸核糖焦磷酸合成酶相关蛋白1、血红素蛋白、烟酸受体可能与心肌缺血发生发展相关。展开更多
目的研究Mpp^+作用PC12细胞48h后蛋白质表达谱的改变,进一步在蛋白质水平上阐明帕金森病的发病机制。方法建立Mpp+诱导的PC12细胞帕金森病模型,提取对照组与实验组的细胞总蛋白,应用荧光差异凝胶电泳(Differential Gel Electrophoresis,...目的研究Mpp^+作用PC12细胞48h后蛋白质表达谱的改变,进一步在蛋白质水平上阐明帕金森病的发病机制。方法建立Mpp+诱导的PC12细胞帕金森病模型,提取对照组与实验组的细胞总蛋白,应用荧光差异凝胶电泳(Differential Gel Electrophoresis,DIGE)系统构建双向电泳图,DeCyder软件分析蛋白表达差异信息,运用MALDI-TOF质谱鉴定差异蛋白质。结果与对照组相比,实验组共有32个蛋白点发生变化;鉴定了其中7种结构和功能各异的蛋白。结论本研究鉴定出氧化应激和线粒体损伤相关的蛋白thioredoxin、MPPs,与细胞骨架相关的蛋白NF-L、ezrin,具有分子伴侣活性的蛋白NAC、crystaillin,与免疫炎症相关的蛋白gClqBP。这些蛋白的显著改变可能与PD的发病机制密切相关。展开更多
Globozoospermia is a severe form of teratozoospermia characterized by round-headed spermatozoa with an absent acrosome, an aberrant nuclear membrane and midpiece defects. Globozoospermia is diagnosed by the presence o...Globozoospermia is a severe form of teratozoospermia characterized by round-headed spermatozoa with an absent acrosome, an aberrant nuclear membrane and midpiece defects. Globozoospermia is diagnosed by the presence of 100% round-headed spermatozoa on semen analysis, and patients with this condition are absolutely infertile. The objective of this study was to investigate the differences in protein expression between human round- headed and normal spermatozoa. Two-dimensional （2-D） fluorescence difference gel electrophoresis （DIGE） coupled with mass spectrometry （MS） was used in this study. Over 61 protein spots were analysed in each paired normal/round-headed comparison, using DIGE technology along with an internal standard. In total, 35 protein spots identified by tandem mass spectrometry （MS/MS） exhibited significant changes （paired t-test, P 〈 0.05） in the expression level between normal and round-headed spermatozoa. A total of nine proteins were found to be upregulated and 26 proteins were found to be downregulated in round-headed spermatozoa compared with normal spermatozoa. The differentially expressed proteins that we identified may have important roles in a variety of cellular processes and structures, including spermatogenesis, cell skeleton, metabolism and spermatozoa motility.展开更多
The foundations of proteomics are to study gene products and their regulatory roles within cells. Paradoxically, the only evidence that sperm cells make new proteins is through mitochondrial protein synthesis. Yet des...The foundations of proteomics are to study gene products and their regulatory roles within cells. Paradoxically, the only evidence that sperm cells make new proteins is through mitochondrial protein synthesis. Yet despite this, spermatozoa are the perfect candidates for mass spectrometry and hence, proteomic analysis. These enterprising cells use a plethora of post-translational modifications in order to gain functionality following their production within the testis. By using a combination of two-dimensional polyacrylamide gel electrophoresis （2D-PAGE）, and more recently liquid chromatography-mass spectrometry （LC-MS）/MS, recent advances in sperm cell biology, through the use of proteomics, is making unparalleled progress. The protein inventory lists being generated have shed light on transmembrane proteins, kinases and chaperones never previously recognized. In addition, the ability to isolate either phosphopeptides or glycopeptides and quantify the differences between cells of two different populations make proteomic analysis of spermatozoa a real chance to finally answer some age old questions.展开更多
Platycodin D(PD), a triterpenoid saponin isolated from Platycodonis Radix, is a famous Chinese herbal medicine that has been shown to have anti-proliferative effects in several cancer cell lines. The aim of this study...Platycodin D(PD), a triterpenoid saponin isolated from Platycodonis Radix, is a famous Chinese herbal medicine that has been shown to have anti-proliferative effects in several cancer cell lines. The aim of this study was to determine the changes in cellular proteins after the treatment of hepatocellular carcinoma HepG2 cells with PD using proteomics approaches. The cell viability was determined using the MTT assay. The proteome was analyzed by two-dimensional difference gel electrophoresis and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Western blot analysis was used to confirm the expression of changed proteins. Our results showed that PD inhibited the proliferation of HepG2 cells in concentration- and time-dependent manners. Sixteen proteins were identified to be up-regulated in PD-treated HepG2 cells, including ATP5 H, OXCT1, KRT9, CCDC40, ERP29, RCN1, ZNF175, HNRNPH1, HSP27, PA2G4, PHB, BANF1, TPM3, ECH1, LGALS1, and MYL6. Three proteins(i.e., RPS12, EMG1, and KRT1) decreased in HepG2 cells after treatment with PD. The changes in HSP27 and PHB were further confirmed by Western blotting. In conclusion, our results shed new lights on the mechanisms of action for the anti-cancer activity of PD.展开更多
Epstein Barr virus infection is believed to play a role in the development of nasopharyngeal carcinoma. In order to investigate the function of EBV in epithelial cell, proteomic methods were used to find and identify ...Epstein Barr virus infection is believed to play a role in the development of nasopharyngeal carcinoma. In order to investigate the function of EBV in epithelial cell, proteomic methods were used to find and identify the differential proteins and expected to elucidate the mechanism of EBV. Altered protein expressions were found between 293 cell (HEK293) and EBV infected cell (293-EBV). In this study, we separated differential expressed proteins using 2D-DIGE method while matrix-assisted laser desorption/ionization tandem time of flight mass spectrometry (MALDI-TOF-MS) method was used to identify proteins. The results showed that 14 proteins were up regulated and 3 proteins were down regulated in 293-EBV cells. Bioinformatic analysis showed that these proteins are involved in cell proliferation, metastasis, apoptosis, metabolism, and signal transduction. Western blotting analysis was further carried out to verify the MS results. Thus, EBV may exert its functions by mediating differential expression of these proteins.展开更多
Cold-induced changes of gene expression and metabolism are critical for plants to survive freezing. Largely by changing gene expression, exposure to a period of non-freezing low temperatures increases plant tolerance ...Cold-induced changes of gene expression and metabolism are critical for plants to survive freezing. Largely by changing gene expression, exposure to a period of non-freezing low temperatures increases plant tolerance to freezing--a phenomenon known as cold acclimation. Cold also induces rapid metabolic changes, which provide instant protection before temperature drops below freezing point. The molecular mechanisms for such rapid metabolic responses to cold remain largely unknown. Here, we use two-dimensional difference gel electrophoresis （2-D DIGE） analysis of sub-cellular fractions ofArabidopsis thaliana proteome coupled with spot identification by tandem mass spectrometry to identify early cold-responsive proteins in Arabidopsis. These proteins include four enzymes involved in starch degradation, three HSP100 proteins, several proteins in the tricarboxylic acid cycle, and sucrose metabolism. Upon cold treatment, the Disproportio- nating Enzyme 2 （DPE2）, a cytosolic transglucosidase metabolizing maltose to glucose, increased rapidly in the centrifugation pellet fraction and decreased in the soluble fraction. Consistent with cold-induced inactivation of DPE2 enzymatic activity, the dpe2 mutant showed increased freezing tolerance without affecting the C-repeat binding transcription factor （CBF） transcriptional pathway. These results support a model that cold-induced inactivation of DPE2 leads to rapid accumulation of maltose, which is a cold-induced compatible solute that protects cells from freezing damage. This study provides evidence for a key role of rapid post-translational regulation of carbohydrate metabolic enzymes in plant protection against sudden temperature drop.展开更多
文摘目的探讨神经毒素6-羟基多巴胺(6-OHDA)诱导PC12细胞的帕金森(PD)模型中GRP78的表达。方法在建立6-OHDA诱导PC12细胞帕金森模型的基础上,MTT法测细胞存活率和Hoechst33342染色检测细胞凋亡。分别提取6-OHDA处理组和对照组细胞总蛋白,应用荧光差异凝胶电泳(Differentia Gel Electrophoresis,DIGE)技术获得蛋白点的差异表达信息,运用MALDI-TOF质谱鉴定出差异蛋白质。结果实验组细胞存活率为60%±4.8%,与对照组比较显著下降(P<0.05)。荧光染色可见细胞核呈固缩状或碎裂状的典型的凋亡形态学改变。DIGE分析发现6-OHDA组表达明显增高的一个蛋白质点,经质谱分析鉴定确认为GRP78。结论6-OHDA能够诱导PC12细胞凋亡,凋亡过程中GRP78表达增高,提示GRP78增高可能与PD的发病机制有关。
文摘目的:筛选心肌缺血相关的蛋白质,以期发现心肌缺血特征性的差异蛋白质或蛋白质群。方法:对模型动物小型猪施行冠脉Ameroid环缩术,通过对模型动物的动态观察,综合评价,并参照WHO冠心病心绞痛诊断标准,明确术后28天符合心肌缺血诊断。术后28天,动物前腔静脉取血,血样处理后进行荧光差异蛋白电泳(2D-DIGE),对差异蛋白点进行MALDI-TOF/TOF分析,获取蛋白样品的肽质量指纹图。结果:共筛选出31个差异表达蛋白质点,其中17个蛋白质点在4周模型组中下调,14个蛋白点上调。对其中15个蛋白点采用质谱技术成功鉴定。白蛋白、血红素蛋白、烟酸受体在4周模型组中低表达,CH4 and secrete domain of Swine IgM、mutated immunoglobulin heavy chain、肌球蛋白、磷脂酶C、白细胞抗原相关酪蛋白磷酸酶相关蛋白、磷酸核糖焦磷酸相关蛋白-1、Ig gamma 4 chain constant region在4周模型组中高表达。结论:初步发现碱性磷酸酶、肌球蛋白、白细胞抗原相关酪蛋白磷酸酶相关蛋白、磷酸核糖焦磷酸合成酶相关蛋白1、血红素蛋白、烟酸受体可能与心肌缺血发生发展相关。
文摘目的研究Mpp^+作用PC12细胞48h后蛋白质表达谱的改变,进一步在蛋白质水平上阐明帕金森病的发病机制。方法建立Mpp+诱导的PC12细胞帕金森病模型,提取对照组与实验组的细胞总蛋白,应用荧光差异凝胶电泳(Differential Gel Electrophoresis,DIGE)系统构建双向电泳图,DeCyder软件分析蛋白表达差异信息,运用MALDI-TOF质谱鉴定差异蛋白质。结果与对照组相比,实验组共有32个蛋白点发生变化;鉴定了其中7种结构和功能各异的蛋白。结论本研究鉴定出氧化应激和线粒体损伤相关的蛋白thioredoxin、MPPs,与细胞骨架相关的蛋白NF-L、ezrin,具有分子伴侣活性的蛋白NAC、crystaillin,与免疫炎症相关的蛋白gClqBP。这些蛋白的显著改变可能与PD的发病机制密切相关。
基金Acknowledgment We thank Beijing Proteome Research Center, （Beijing, China） for its enthusiastic technological support and for the theory of 2-D DIGE. We also thank（Changsha, China） College of Life Sciences at Hunan Normal University for supporting the MS technology. Finally, we are very grateful to our collaborators for their help, as well as their valuable discussions and suggestions during the course of this work. This work was supported by two grants from the National Natural Science Foundation of China （NO. 30170480 and NO. 30470884）.
文摘Globozoospermia is a severe form of teratozoospermia characterized by round-headed spermatozoa with an absent acrosome, an aberrant nuclear membrane and midpiece defects. Globozoospermia is diagnosed by the presence of 100% round-headed spermatozoa on semen analysis, and patients with this condition are absolutely infertile. The objective of this study was to investigate the differences in protein expression between human round- headed and normal spermatozoa. Two-dimensional （2-D） fluorescence difference gel electrophoresis （DIGE） coupled with mass spectrometry （MS） was used in this study. Over 61 protein spots were analysed in each paired normal/round-headed comparison, using DIGE technology along with an internal standard. In total, 35 protein spots identified by tandem mass spectrometry （MS/MS） exhibited significant changes （paired t-test, P 〈 0.05） in the expression level between normal and round-headed spermatozoa. A total of nine proteins were found to be upregulated and 26 proteins were found to be downregulated in round-headed spermatozoa compared with normal spermatozoa. The differentially expressed proteins that we identified may have important roles in a variety of cellular processes and structures, including spermatogenesis, cell skeleton, metabolism and spermatozoa motility.
文摘The foundations of proteomics are to study gene products and their regulatory roles within cells. Paradoxically, the only evidence that sperm cells make new proteins is through mitochondrial protein synthesis. Yet despite this, spermatozoa are the perfect candidates for mass spectrometry and hence, proteomic analysis. These enterprising cells use a plethora of post-translational modifications in order to gain functionality following their production within the testis. By using a combination of two-dimensional polyacrylamide gel electrophoresis （2D-PAGE）, and more recently liquid chromatography-mass spectrometry （LC-MS）/MS, recent advances in sperm cell biology, through the use of proteomics, is making unparalleled progress. The protein inventory lists being generated have shed light on transmembrane proteins, kinases and chaperones never previously recognized. In addition, the ability to isolate either phosphopeptides or glycopeptides and quantify the differences between cells of two different populations make proteomic analysis of spermatozoa a real chance to finally answer some age old questions.
基金supported by the Science and Technology Development Fund,Macao S.A.R(FDCT)(070/2013/A)the Research Fund of University of Macao(SRG026-ICMS13-LJJ and MRG008-LJJ2014-ICMS)+1 种基金the Administration of Traditional Chinese Medicine of Zhejiang Province(No.2012 ZA028)Program of Xinmiao Talents in Zhejiang Province(No.2010 R410024)
文摘Platycodin D(PD), a triterpenoid saponin isolated from Platycodonis Radix, is a famous Chinese herbal medicine that has been shown to have anti-proliferative effects in several cancer cell lines. The aim of this study was to determine the changes in cellular proteins after the treatment of hepatocellular carcinoma HepG2 cells with PD using proteomics approaches. The cell viability was determined using the MTT assay. The proteome was analyzed by two-dimensional difference gel electrophoresis and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Western blot analysis was used to confirm the expression of changed proteins. Our results showed that PD inhibited the proliferation of HepG2 cells in concentration- and time-dependent manners. Sixteen proteins were identified to be up-regulated in PD-treated HepG2 cells, including ATP5 H, OXCT1, KRT9, CCDC40, ERP29, RCN1, ZNF175, HNRNPH1, HSP27, PA2G4, PHB, BANF1, TPM3, ECH1, LGALS1, and MYL6. Three proteins(i.e., RPS12, EMG1, and KRT1) decreased in HepG2 cells after treatment with PD. The changes in HSP27 and PHB were further confirmed by Western blotting. In conclusion, our results shed new lights on the mechanisms of action for the anti-cancer activity of PD.
文摘Epstein Barr virus infection is believed to play a role in the development of nasopharyngeal carcinoma. In order to investigate the function of EBV in epithelial cell, proteomic methods were used to find and identify the differential proteins and expected to elucidate the mechanism of EBV. Altered protein expressions were found between 293 cell (HEK293) and EBV infected cell (293-EBV). In this study, we separated differential expressed proteins using 2D-DIGE method while matrix-assisted laser desorption/ionization tandem time of flight mass spectrometry (MALDI-TOF-MS) method was used to identify proteins. The results showed that 14 proteins were up regulated and 3 proteins were down regulated in 293-EBV cells. Bioinformatic analysis showed that these proteins are involved in cell proliferation, metastasis, apoptosis, metabolism, and signal transduction. Western blotting analysis was further carried out to verify the MS results. Thus, EBV may exert its functions by mediating differential expression of these proteins.
文摘Cold-induced changes of gene expression and metabolism are critical for plants to survive freezing. Largely by changing gene expression, exposure to a period of non-freezing low temperatures increases plant tolerance to freezing--a phenomenon known as cold acclimation. Cold also induces rapid metabolic changes, which provide instant protection before temperature drops below freezing point. The molecular mechanisms for such rapid metabolic responses to cold remain largely unknown. Here, we use two-dimensional difference gel electrophoresis （2-D DIGE） analysis of sub-cellular fractions ofArabidopsis thaliana proteome coupled with spot identification by tandem mass spectrometry to identify early cold-responsive proteins in Arabidopsis. These proteins include four enzymes involved in starch degradation, three HSP100 proteins, several proteins in the tricarboxylic acid cycle, and sucrose metabolism. Upon cold treatment, the Disproportio- nating Enzyme 2 （DPE2）, a cytosolic transglucosidase metabolizing maltose to glucose, increased rapidly in the centrifugation pellet fraction and decreased in the soluble fraction. Consistent with cold-induced inactivation of DPE2 enzymatic activity, the dpe2 mutant showed increased freezing tolerance without affecting the C-repeat binding transcription factor （CBF） transcriptional pathway. These results support a model that cold-induced inactivation of DPE2 leads to rapid accumulation of maltose, which is a cold-induced compatible solute that protects cells from freezing damage. This study provides evidence for a key role of rapid post-translational regulation of carbohydrate metabolic enzymes in plant protection against sudden temperature drop.
