Androgens play a central role in prostate cancer pathogenesis, and hence most of the patients respond to androgen deprivation therapies. However, patients tend to relapse with aggressive prostate cancer, which has bee...Androgens play a central role in prostate cancer pathogenesis, and hence most of the patients respond to androgen deprivation therapies. However, patients tend to relapse with aggressive prostate cancer, which has been termed as hormone refractory. To identify the proteins that mediate progression to the hormone-refractory state, we used protein-chip technology for mass profiling of patients＇ sera. This study included 16 patients with metastatic hormone-refractory prostate cancer who were initially treated with androgen deprivation therapy. Serum samples were collected from each patient at five time points： point A, pre-treatment; point B, at the nadir of the prostate- specific antigen （PSA） level; point C, PSA failure; point D, the early hormone-refractory phase; and point E, the late hormone-refractory phase. Using surface-enhanced laser desorption/ionization time-of-flight mass spectrometry, we performed protein mass profiling of the patients＇ sera and identified a 6 640-Da peak that increased with disease progression. Target proteins were partially purified, and by amino acid sequencing the peak was identified as a fragment of apolipoprotein C-I （ApoC-I）. Serum ApoC-I protein levels increased with disease progression. On immunohistochemical analysis, the ApoC-i protein was found localized to the cytoplasm of the hormone-refractory cancer cells. In this study, we showed an increase in serum ApoC-I protein levels in prostate cancer patients during their progression to the hormone-refractory state, which suggests that ApoC-I protein is related to progression of prostate cancer. However, as the exact role of ApoC-I in prostate cancer pathogenesis is unclear, further research is required.展开更多
Gene expression profile changes in brain regions following traumatic brain injury at the gene level cannot sufficiently elucidate gene expression time, expression amount, protein post-translational processing or modif...Gene expression profile changes in brain regions following traumatic brain injury at the gene level cannot sufficiently elucidate gene expression time, expression amount, protein post-translational processing or modification. Therefore, it is necessary to quantitatively analyze the gene expression profile using proteomic techniques. In the present study, we established a rat model of closed brain injury using Marmarou＇s weight-drop device, and investigated hippocampal differential protein expression using two-dimensional gel electrophoresis and surface-enhanced laser desorption ionization-time of flight-mass spectrometry. A total of 364 protein peaks were detected on weak cation exchange-2 protein chips, including 37 differential protein peaks. 345 protein peaks were detected on immobilized metal affinity capture arrays-Cu, including 12 differential protein peaks Further examination of these differential proteins revealed that glucose-regulated protein and proteasome subunit alpha type 3 expression were significantly upregulated post-injury. These results indicate that brain injury can alter protein expression in the hippocampus, and that glucose-regulated protein and proteasome subunit alpha type 3 are closely associated with the occurrence and development of traumatic brain injury.展开更多
目的:探讨乙型肝炎病毒(HBV)相关性肝病患者血清中小分子差异蛋白在HBV感染后病情发展过程中的意义.方法:采用蛋白芯片及表面增强激光解析电离飞行时间质谱(surface-enhanced laserdesorption/ionization time-of-flight massspectromet...目的:探讨乙型肝炎病毒(HBV)相关性肝病患者血清中小分子差异蛋白在HBV感染后病情发展过程中的意义.方法:采用蛋白芯片及表面增强激光解析电离飞行时间质谱(surface-enhanced laserdesorption/ionization time-of-flight massspectrometry,SELDI-TOF-MS)技术对已用乙腈去除高丰度蛋白的正常对照(NC)、乙型肝炎病毒携带者(ASCs)、慢性乙型肝炎(CHB)、肝硬化(LC)及原发性肝细胞癌(HCC)患者术前血清进行检测,筛选各自的血清小分子差异表达蛋白,并分别建立诊断模型.在蛋白数据库expasy寻找相关差异蛋白信息,对差异蛋白峰的可能结构及功能进行评价.结果:与NC组比,ASCs组有63个蛋白质波峰的强度值存在统计学差异(P<0.05),其中29个上调,34个下调;CHB组有57个,其中21个上调,36个下调;LC组有68个,其中33个上调,35个下调;HCC组有74个,其中28个上调,46个下调;通过对比分析,发现在4个病例组表达均为上调的m/z为15889.8,蛋白峰强度值在NC<ASC<CHB<LC组,HCC组较CHB和LC组低;11742.2蛋白峰强度值在NC<ASC<CHB<LC组和NC<ASC<CHB<HCC组,在LC和HCC组最高,用此蛋白峰诊断HBV感染相关性LC的灵敏度和特异度分别为90%和86.67%,诊断HCC的灵敏度和特异度分别为93.33%和83.33%.结论:成功去除高丰度蛋白和应用SELDI-T O F-M S技术筛选H B V感染相关性肝病患者血清中小分子差异蛋白,m/z为8709.7、13759.8、14004.0、15361.89、16072.3、2746.8、3449.1、3941.06、4098.3、9445.5的10个蛋白峰可能与HBV感染有关;m/z为15889.8的蛋白峰可能成为H B V感染后进展为LC早期诊断的标志物,而m/z为11742.2的蛋白峰也许是HBV相关性LC或HCC的一个重要标志.展开更多
背景与目的:人卵巢浆液性乳头状腺癌细胞株SKOV3及其在裸鼠体内建立的淋巴结定向高转移亚克隆第二代SKOV3-pm2、第三代SKOV3-pm3细胞株,为卵巢癌转移分子机制的研究提供了细胞模型。本研究应用飞行时间质谱技术结合蛋白芯片分析筛选卵...背景与目的:人卵巢浆液性乳头状腺癌细胞株SKOV3及其在裸鼠体内建立的淋巴结定向高转移亚克隆第二代SKOV3-pm2、第三代SKOV3-pm3细胞株,为卵巢癌转移分子机制的研究提供了细胞模型。本研究应用飞行时间质谱技术结合蛋白芯片分析筛选卵巢癌淋巴结定向高转移与非定向转移细胞株之间的蛋白质表达差异。方法:采用动物实验测定SKOV3、SKOV3-pm2和SKOV3-pm3三种细胞株的淋巴结转移率。应用表面增强激光解吸离子化-飞行时间质谱(surface-enhanced laser desorption and ionization-time of flight-mass spectrometry,SELDI-TOF-MS)技术检测各细胞株提取的胞浆总蛋白和分泌蛋白,每种细胞分别采用CM-10型弱阳离子交换芯片和IMAC-3型固定金属亲和芯片检测。应用Ciphergen Protein Software3.2.0软件和Biomarker Wizard软件对采集3组细胞的蛋白峰进行比较,峰强度相差0.5倍以上者定义为差异蛋白。结果:动物实验显示,细胞株SKOV3及高转移亚克隆SKOV3-pm2、SKOV3-pm3的淋巴结转移率分别为20%、90%和100%,前者与后二者之间的差异有统计学意义(P<0.05)。获得CM-10和IMAC3两种蛋白芯片上SKOV3、SKOV3-pm2、SKOV3-pm3细胞株蛋白质谱图谱,对比发现:质荷比(m/z)为6971、7475、9089、9453、10103、11655的胞浆蛋白及质荷比(m/z)为4746的分泌蛋白在上述三种细胞株中存在不同程度差异表达。结论:应用SELDI-TOF-MS技术结合固定金属亲和芯片和弱阳离子交换芯片,可有效筛选卵巢癌淋巴结定向高转移特性细胞株中的特异性表达蛋白;寻找到的差异蛋白与淋巴结定向高转移潜能密切相关。展开更多
文摘Androgens play a central role in prostate cancer pathogenesis, and hence most of the patients respond to androgen deprivation therapies. However, patients tend to relapse with aggressive prostate cancer, which has been termed as hormone refractory. To identify the proteins that mediate progression to the hormone-refractory state, we used protein-chip technology for mass profiling of patients＇ sera. This study included 16 patients with metastatic hormone-refractory prostate cancer who were initially treated with androgen deprivation therapy. Serum samples were collected from each patient at five time points： point A, pre-treatment; point B, at the nadir of the prostate- specific antigen （PSA） level; point C, PSA failure; point D, the early hormone-refractory phase; and point E, the late hormone-refractory phase. Using surface-enhanced laser desorption/ionization time-of-flight mass spectrometry, we performed protein mass profiling of the patients＇ sera and identified a 6 640-Da peak that increased with disease progression. Target proteins were partially purified, and by amino acid sequencing the peak was identified as a fragment of apolipoprotein C-I （ApoC-I）. Serum ApoC-I protein levels increased with disease progression. On immunohistochemical analysis, the ApoC-i protein was found localized to the cytoplasm of the hormone-refractory cancer cells. In this study, we showed an increase in serum ApoC-I protein levels in prostate cancer patients during their progression to the hormone-refractory state, which suggests that ApoC-I protein is related to progression of prostate cancer. However, as the exact role of ApoC-I in prostate cancer pathogenesis is unclear, further research is required.
基金the National Natural Science Foundation of China,No. 30471934
文摘Gene expression profile changes in brain regions following traumatic brain injury at the gene level cannot sufficiently elucidate gene expression time, expression amount, protein post-translational processing or modification. Therefore, it is necessary to quantitatively analyze the gene expression profile using proteomic techniques. In the present study, we established a rat model of closed brain injury using Marmarou＇s weight-drop device, and investigated hippocampal differential protein expression using two-dimensional gel electrophoresis and surface-enhanced laser desorption ionization-time of flight-mass spectrometry. A total of 364 protein peaks were detected on weak cation exchange-2 protein chips, including 37 differential protein peaks. 345 protein peaks were detected on immobilized metal affinity capture arrays-Cu, including 12 differential protein peaks Further examination of these differential proteins revealed that glucose-regulated protein and proteasome subunit alpha type 3 expression were significantly upregulated post-injury. These results indicate that brain injury can alter protein expression in the hippocampus, and that glucose-regulated protein and proteasome subunit alpha type 3 are closely associated with the occurrence and development of traumatic brain injury.
文摘目的:探讨乙型肝炎病毒(HBV)相关性肝病患者血清中小分子差异蛋白在HBV感染后病情发展过程中的意义.方法:采用蛋白芯片及表面增强激光解析电离飞行时间质谱(surface-enhanced laserdesorption/ionization time-of-flight massspectrometry,SELDI-TOF-MS)技术对已用乙腈去除高丰度蛋白的正常对照(NC)、乙型肝炎病毒携带者(ASCs)、慢性乙型肝炎(CHB)、肝硬化(LC)及原发性肝细胞癌(HCC)患者术前血清进行检测,筛选各自的血清小分子差异表达蛋白,并分别建立诊断模型.在蛋白数据库expasy寻找相关差异蛋白信息,对差异蛋白峰的可能结构及功能进行评价.结果:与NC组比,ASCs组有63个蛋白质波峰的强度值存在统计学差异(P<0.05),其中29个上调,34个下调;CHB组有57个,其中21个上调,36个下调;LC组有68个,其中33个上调,35个下调;HCC组有74个,其中28个上调,46个下调;通过对比分析,发现在4个病例组表达均为上调的m/z为15889.8,蛋白峰强度值在NC<ASC<CHB<LC组,HCC组较CHB和LC组低;11742.2蛋白峰强度值在NC<ASC<CHB<LC组和NC<ASC<CHB<HCC组,在LC和HCC组最高,用此蛋白峰诊断HBV感染相关性LC的灵敏度和特异度分别为90%和86.67%,诊断HCC的灵敏度和特异度分别为93.33%和83.33%.结论:成功去除高丰度蛋白和应用SELDI-T O F-M S技术筛选H B V感染相关性肝病患者血清中小分子差异蛋白,m/z为8709.7、13759.8、14004.0、15361.89、16072.3、2746.8、3449.1、3941.06、4098.3、9445.5的10个蛋白峰可能与HBV感染有关;m/z为15889.8的蛋白峰可能成为H B V感染后进展为LC早期诊断的标志物,而m/z为11742.2的蛋白峰也许是HBV相关性LC或HCC的一个重要标志.
文摘背景与目的:人卵巢浆液性乳头状腺癌细胞株SKOV3及其在裸鼠体内建立的淋巴结定向高转移亚克隆第二代SKOV3-pm2、第三代SKOV3-pm3细胞株,为卵巢癌转移分子机制的研究提供了细胞模型。本研究应用飞行时间质谱技术结合蛋白芯片分析筛选卵巢癌淋巴结定向高转移与非定向转移细胞株之间的蛋白质表达差异。方法:采用动物实验测定SKOV3、SKOV3-pm2和SKOV3-pm3三种细胞株的淋巴结转移率。应用表面增强激光解吸离子化-飞行时间质谱(surface-enhanced laser desorption and ionization-time of flight-mass spectrometry,SELDI-TOF-MS)技术检测各细胞株提取的胞浆总蛋白和分泌蛋白,每种细胞分别采用CM-10型弱阳离子交换芯片和IMAC-3型固定金属亲和芯片检测。应用Ciphergen Protein Software3.2.0软件和Biomarker Wizard软件对采集3组细胞的蛋白峰进行比较,峰强度相差0.5倍以上者定义为差异蛋白。结果:动物实验显示,细胞株SKOV3及高转移亚克隆SKOV3-pm2、SKOV3-pm3的淋巴结转移率分别为20%、90%和100%,前者与后二者之间的差异有统计学意义(P<0.05)。获得CM-10和IMAC3两种蛋白芯片上SKOV3、SKOV3-pm2、SKOV3-pm3细胞株蛋白质谱图谱,对比发现:质荷比(m/z)为6971、7475、9089、9453、10103、11655的胞浆蛋白及质荷比(m/z)为4746的分泌蛋白在上述三种细胞株中存在不同程度差异表达。结论:应用SELDI-TOF-MS技术结合固定金属亲和芯片和弱阳离子交换芯片,可有效筛选卵巢癌淋巴结定向高转移特性细胞株中的特异性表达蛋白;寻找到的差异蛋白与淋巴结定向高转移潜能密切相关。
