AIM:To investigate and elucidate the molecular mechanism underlying varioliform gastritis for early detection,prevention and intervention of gastric cancer.METHODS:A combination of two-dimensional gel electrophoresis ...AIM:To investigate and elucidate the molecular mechanism underlying varioliform gastritis for early detection,prevention and intervention of gastric cancer.METHODS:A combination of two-dimensional gel electrophoresis and mass spectrometry was used to detect the differentially expressed proteins between varioliform gastritis and matched normal mucosa.The selected proteins were confirmed by Western blotting and reverse transcription polymerase chain reaction(RT-PCR) in additional samples and the function of some proteins in varioliform gastritis was analyzed by bio-method preliminarily.RESULTS:We identified 21 differentially expressed proteins in varioliform gastritis,and compared them with matched normal mucosa.Eleven proteins were upregulated and ten downregulated in varioliform gastritis when compared with the same proteins in individualmatched normal gastric mucosa.These proteins are related to metabolism,oxidation,cytoskeleton,apoptosis,signal transduction and other aspects of cells.Two novel proteins,thioredoxin domain-containing protein 5(TXNDC5) upregulated in varioliform gastritis,and neuropolypeptide h3 [phosphatidylethanolamine-binding protein 1(PEBP1)] downregulated in varioliform gastritis,were further investigated.Their expressions were validated by Western blotting and RT-PCR in 12 cases of varioliform gastritis which was matched with normal mucosa.The expression level of PEBP1 in varioliform gastritis was significantly lower(P<0.05) while that of TXNDC5 was significantly higher than that in matched normal gastric mucosa(P<0.05).CONCLUSION:There are some changes of protein expression in varioliform gastritis.Downregulation of PEBP1 and upregulation of TXNDC5 are involved in the development of varioliform gastritis.展开更多
为阐明牛初乳、牛常乳乳清蛋白的差异,利用同位素标记相对和绝对定量(isobaric tags for relative and absolute quantitation,iTRAQ)蛋白质组学技术对二者进行蛋白质组差异分析,在得到的599种具有定量信息的乳清蛋白中,鉴定出60种差异...为阐明牛初乳、牛常乳乳清蛋白的差异,利用同位素标记相对和绝对定量(isobaric tags for relative and absolute quantitation,iTRAQ)蛋白质组学技术对二者进行蛋白质组差异分析,在得到的599种具有定量信息的乳清蛋白中,鉴定出60种差异蛋白。将牛初乳与牛常乳乳清丰度差异蛋白进行生物信息学分析发现,差异蛋白主要参与的生物过程为转运、定位、单一生物作用等;主要参与的分子功能为顶端质膜、细胞外区域、细胞外区域部分等;主要参与的细胞组成为蛋白结合和阴离子结合。丰度差异蛋白中有9种是与信号传导相关,有6种糖基化乳清蛋白。此外,利用蛋白质网络互作分析发现,差异蛋白中存在具有高连接度的关键乳清蛋白因子。本研究采用iTRAO技术对牛初乳与牛常乳乳清差异蛋白进行鉴定及生物信息学分析,为今后改善牛初、常乳品质,开发婴幼儿乳粉以及功能性乳制品提供了一定参考。展开更多
目的利用蛋白质组学技术筛选精神分裂症患者血清中表达差异的蛋白质,以探讨精神分裂症致病机制。方法收集13例精神分裂症患者和6例健康志愿者(对照组)血清样本,采用非标记蛋白质组学技术联合液相色谱-质谱分析技术鉴定两组的差异蛋白,...目的利用蛋白质组学技术筛选精神分裂症患者血清中表达差异的蛋白质,以探讨精神分裂症致病机制。方法收集13例精神分裂症患者和6例健康志愿者(对照组)血清样本,采用非标记蛋白质组学技术联合液相色谱-质谱分析技术鉴定两组的差异蛋白,筛选出表达差异显著的蛋白质,并进行基因本体和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)富集分析。结果非标记蛋白质组学结果显示精神分裂症患者血清中共筛选出126个显著性差异的蛋白,其中63个上调蛋白,63个下调蛋白。这些差异蛋白主要富集在血液微粒、细胞质囊腔、囊腔、分泌颗粒管腔等细胞组分,分子功能主要表现在肽酶调节活性,主要参与蛋白激活级联、体液免疫应答、血小板脱粒、补体激活、蛋白修饰、急性炎症反应等生物学过程。精神分裂症主要富集的KEGG通路包括补体和凝血级联反应、冠状病毒和全身性红斑狼疮。结论精神分裂症患者血清中差异蛋白主要富集在补体和凝血级联反应通路,揭示该通路在精神分裂症发病过程中发挥重要作用。展开更多
目的:分析有腋窝淋巴结转移和无腋窝淋巴结转移的乳腺浸润性导管癌患者血清中的差异蛋白,筛选与乳腺癌转移相关的生物标志物和治疗靶点。方法:本研究采用定量蛋白质组学串联质谱标签(tandem mass tag,TMT)标记技术分别对14例有腋窝淋巴...目的:分析有腋窝淋巴结转移和无腋窝淋巴结转移的乳腺浸润性导管癌患者血清中的差异蛋白,筛选与乳腺癌转移相关的生物标志物和治疗靶点。方法:本研究采用定量蛋白质组学串联质谱标签(tandem mass tag,TMT)标记技术分别对14例有腋窝淋巴结转移及14例无腋窝淋巴结转移的乳腺癌患者血清蛋白进行检测,并对蛋白质进行定量分析,筛选出发生显著变化的差异蛋白,再搜索Uniprot数据库和用Proteome Discoverer软件分析,进一步进行生物信息学分析。结果:有腋窝淋巴结转移组中共筛选出差异蛋白119个,其中6个表达上调,113个表达下调。基因本体(gene ontology,GO)注释分析和功能聚类分析表明,这些差异蛋白质主要定位于细胞外区,与肿瘤的生物合成、细胞增殖、血管生成相关。Western boltting和qRT-PCR验证了K1C19(下调0.11倍)和PSME2(上调2.02倍)的表达。结论:TMT定量蛋白组学方法能有效筛选有腋窝淋巴结转移的和无腋窝淋巴结转移的乳腺癌患者血清中的差异蛋白。其中,K1C19和PSME2是值得进一步研究的乳腺癌淋巴结转移的候选血清标志物。展开更多
文摘AIM:To investigate and elucidate the molecular mechanism underlying varioliform gastritis for early detection,prevention and intervention of gastric cancer.METHODS:A combination of two-dimensional gel electrophoresis and mass spectrometry was used to detect the differentially expressed proteins between varioliform gastritis and matched normal mucosa.The selected proteins were confirmed by Western blotting and reverse transcription polymerase chain reaction(RT-PCR) in additional samples and the function of some proteins in varioliform gastritis was analyzed by bio-method preliminarily.RESULTS:We identified 21 differentially expressed proteins in varioliform gastritis,and compared them with matched normal mucosa.Eleven proteins were upregulated and ten downregulated in varioliform gastritis when compared with the same proteins in individualmatched normal gastric mucosa.These proteins are related to metabolism,oxidation,cytoskeleton,apoptosis,signal transduction and other aspects of cells.Two novel proteins,thioredoxin domain-containing protein 5(TXNDC5) upregulated in varioliform gastritis,and neuropolypeptide h3 [phosphatidylethanolamine-binding protein 1(PEBP1)] downregulated in varioliform gastritis,were further investigated.Their expressions were validated by Western blotting and RT-PCR in 12 cases of varioliform gastritis which was matched with normal mucosa.The expression level of PEBP1 in varioliform gastritis was significantly lower(P<0.05) while that of TXNDC5 was significantly higher than that in matched normal gastric mucosa(P<0.05).CONCLUSION:There are some changes of protein expression in varioliform gastritis.Downregulation of PEBP1 and upregulation of TXNDC5 are involved in the development of varioliform gastritis.
文摘为阐明牛初乳、牛常乳乳清蛋白的差异,利用同位素标记相对和绝对定量(isobaric tags for relative and absolute quantitation,iTRAQ)蛋白质组学技术对二者进行蛋白质组差异分析,在得到的599种具有定量信息的乳清蛋白中,鉴定出60种差异蛋白。将牛初乳与牛常乳乳清丰度差异蛋白进行生物信息学分析发现,差异蛋白主要参与的生物过程为转运、定位、单一生物作用等;主要参与的分子功能为顶端质膜、细胞外区域、细胞外区域部分等;主要参与的细胞组成为蛋白结合和阴离子结合。丰度差异蛋白中有9种是与信号传导相关,有6种糖基化乳清蛋白。此外,利用蛋白质网络互作分析发现,差异蛋白中存在具有高连接度的关键乳清蛋白因子。本研究采用iTRAO技术对牛初乳与牛常乳乳清差异蛋白进行鉴定及生物信息学分析,为今后改善牛初、常乳品质,开发婴幼儿乳粉以及功能性乳制品提供了一定参考。
文摘目的利用蛋白质组学技术筛选精神分裂症患者血清中表达差异的蛋白质,以探讨精神分裂症致病机制。方法收集13例精神分裂症患者和6例健康志愿者(对照组)血清样本,采用非标记蛋白质组学技术联合液相色谱-质谱分析技术鉴定两组的差异蛋白,筛选出表达差异显著的蛋白质,并进行基因本体和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)富集分析。结果非标记蛋白质组学结果显示精神分裂症患者血清中共筛选出126个显著性差异的蛋白,其中63个上调蛋白,63个下调蛋白。这些差异蛋白主要富集在血液微粒、细胞质囊腔、囊腔、分泌颗粒管腔等细胞组分,分子功能主要表现在肽酶调节活性,主要参与蛋白激活级联、体液免疫应答、血小板脱粒、补体激活、蛋白修饰、急性炎症反应等生物学过程。精神分裂症主要富集的KEGG通路包括补体和凝血级联反应、冠状病毒和全身性红斑狼疮。结论精神分裂症患者血清中差异蛋白主要富集在补体和凝血级联反应通路,揭示该通路在精神分裂症发病过程中发挥重要作用。
