目的通过NHE1基因敲除模型鼠的海马组织差异蛋白质组学分析,发现并明确Ppp3cb和Ppm1g的表达特征。方法①选取6只2周龄NHE1基因敲除模型鼠作为模型组,同周龄野生型小鼠6只作为对照组,采用琼脂糖凝胶电泳检测其基因型;应用旷场实验和强迫...目的通过NHE1基因敲除模型鼠的海马组织差异蛋白质组学分析,发现并明确Ppp3cb和Ppm1g的表达特征。方法①选取6只2周龄NHE1基因敲除模型鼠作为模型组,同周龄野生型小鼠6只作为对照组,采用琼脂糖凝胶电泳检测其基因型;应用旷场实验和强迫游泳实验对模型组和对照组小鼠进行行为学评估,并按照Racine评分标准对模型鼠进行癫痫发作分级;②通过串联质谱分析技术对模型组和对照组的海马组织进行差异蛋白筛选,基因本体论(Gene Ontology Analysis,GO)分析差异蛋白并进行注释和富集,蛋白网络数据库(search tool for the retrieval of interesting genes,STRING)分析差异蛋白之间的蛋白相互作用(protein-protein interaction,PPI);③应用qPCR和Western blot检测Ppp3cb和Ppm1g的转录和翻译水平,应用免疫组织化学技术分别观察其在组织中的表达量。结果①模型组小鼠NHE1基因未见表达,旷场实验中模型鼠的运动总距离较对照组减少(P=0.0073),跨越的格子数比对照组显著减少(P<0.0001)。强迫游泳实验结果显示,模型鼠不动的时间明显延长(P<0.0001);②以表达倍数(FC)≥1.2倍且P<0.05为筛选标准,检测到海马组织中845个差异表达的蛋白质点,其中有9个蛋白表达上调,7个蛋白表达下调。其中Ppp3cb下调,Ppm1g上调。GO功能注释结果表明,NHE1敲除后,分子功能(MF)富集在蛋白丝氨酸/苏氨酸磷酸酶活性的差异最显著,细胞成分(CC)富集在质膜部分的差异蛋白数量最多,生物过程(BP)富集在负向调节生物过程、免疫系统过程的差异蛋白数量最多。STRING分析显示差异蛋白Ppp3cb和Slc9a1直接作用,Ppm1g通过Ppp3cb和Slc9a1间接作用,Ppp3cb和Ppm1g之间相互作用。③Ppp3cb的转录和翻译水平减少,在组织中的表达量下降,而Ppm1g转录和翻译水平增加,在组织中的表达量上升(P<0.05)。结论本研究确定了NHE1基因敲除小鼠海马组织中差异蛋白Ppp3cb表达下调,而Ppm1g表达上调,为进一步研究Ppp3cb和Ppm1g参与癫痫发病机制提供了依据。展开更多
Objective: To clone the partial sequence of N+/H+ exchanger-1 (NHE-1) gene of human lung cancer cells and insert it reversely into the multiclone site of pLXSN in order to construct an antisense expression vector for ...Objective: To clone the partial sequence of N+/H+ exchanger-1 (NHE-1) gene of human lung cancer cells and insert it reversely into the multiclone site of pLXSN in order to construct an antisense expression vector for tumor gene therapy in vivo. Methods: With use of the upstream and downstream primers containing Barn H I and EcoR I in their5’ ends respectively, a partial sequence of the first exon of NHE-1 gene was cloned in a length of 454 bp from genomic DNA of human lung cancer cell A549 with PCR method. The product was then directionally and reversely insert into the multiclone site of pLXSN. Finally, the constructed recombinant was identified with agarose gel electrophoresis and DNA sequencing. Results: The cloned fragment was 461 bp in length and successfully ligated to pLXSN with the identification by agarose gel electrophoresis. DNA sequencing confirmed that the fragment cloned and inserted into the vector was identical with the targeted one. Conclusion: The targeted fragment is successfully cloned and reversely inserted into pLXSN in our experiment. The antisense expression vector of NHE-1, pNHE-1. was consfructed successfully.展开更多
Objective : To investigate the effects of the transfection of NHE-1 ribozyme gene on the apoptosis of pulmonary artery smooth muscle cells (PASMC) in vitro. Methods: After NHE-1 ribozyme gene was designed, synthesized...Objective : To investigate the effects of the transfection of NHE-1 ribozyme gene on the apoptosis of pulmonary artery smooth muscle cells (PASMC) in vitro. Methods: After NHE-1 ribozyme gene was designed, synthesized and then cloned into plasmid pLXSN, the recombined plasmid was tansfected into cultured rat PASMC. Expression of NHE-1 mRNA was detected with semi-quantitative RT-PCR. Intracellular pH (pHi) was measured by using fluorescence dye BCECF-AM. Cell cycle was measured with aid of flow cy-tometric DNA analysis. Cell apoptosis was observed with electron microscopy and terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling (TUNED respectively. Results: The NHE-1 mRNA expression level and pHi value were significantly lower in PASMCs transfected with NHE-1 ribozyme gene than those transfected with pLXSN or without transfection. Meanwhile, the apoptosis rate of cells transfected with NHE-1 ribozyme gene was increased significantly. Morphology of cell apoptosis was observed in the cells transfected with NHE-1 ribozyme gene under an electron microscope. Conclusion: The transfection of NHE-1 ribozyme gene induces the apoptosis of PASMCs by inhibiting NHE-1 expression and intracellular acidification.展开更多
Wingless/Int （Wnt） signaling pathways are signal transduction mechanisms that have been widely studied In the field of embryogen- esis. Recent work has established a critical role for these pathways in brain develop...Wingless/Int （Wnt） signaling pathways are signal transduction mechanisms that have been widely studied In the field of embryogen- esis. Recent work has established a critical role for these pathways in brain development, especially of midbrain dopaminergic neu- rones, However, the fundamental importance of Wnt signaling for the normal function of mature neurones in the adult central nervous system has also lately been demonstrated by an increasing number of studies. Parkinson＇s disease （PD） is the second most prevalent neurodegenerative disease worldwide and is currently incurable. This debilitating disease is characterized by the progres- sive loss of a subset of midbrain dopaminergic neurones in the substontla nigm leadingto typical extrapyramidal motor symptoms. The aetiology of PD is poorly understood but work performed over the Last two decades has identified a growing number of genetic defects that underlie this condition. Herewe review a growing body of data connecting genes implicated in PD--most notablythe PARKgenes-- with Wnt signaling. These observations provide clues to the normal function of these proteins in healthy neurones and suggest that deregulated Wnt signaling might be a frequent pathomechanlsm leading to PD. These observations have implications for the patho- genesis and treatment of neurodegenerative diseases in general.展开更多
文摘目的通过NHE1基因敲除模型鼠的海马组织差异蛋白质组学分析,发现并明确Ppp3cb和Ppm1g的表达特征。方法①选取6只2周龄NHE1基因敲除模型鼠作为模型组,同周龄野生型小鼠6只作为对照组,采用琼脂糖凝胶电泳检测其基因型;应用旷场实验和强迫游泳实验对模型组和对照组小鼠进行行为学评估,并按照Racine评分标准对模型鼠进行癫痫发作分级;②通过串联质谱分析技术对模型组和对照组的海马组织进行差异蛋白筛选,基因本体论(Gene Ontology Analysis,GO)分析差异蛋白并进行注释和富集,蛋白网络数据库(search tool for the retrieval of interesting genes,STRING)分析差异蛋白之间的蛋白相互作用(protein-protein interaction,PPI);③应用qPCR和Western blot检测Ppp3cb和Ppm1g的转录和翻译水平,应用免疫组织化学技术分别观察其在组织中的表达量。结果①模型组小鼠NHE1基因未见表达,旷场实验中模型鼠的运动总距离较对照组减少(P=0.0073),跨越的格子数比对照组显著减少(P<0.0001)。强迫游泳实验结果显示,模型鼠不动的时间明显延长(P<0.0001);②以表达倍数(FC)≥1.2倍且P<0.05为筛选标准,检测到海马组织中845个差异表达的蛋白质点,其中有9个蛋白表达上调,7个蛋白表达下调。其中Ppp3cb下调,Ppm1g上调。GO功能注释结果表明,NHE1敲除后,分子功能(MF)富集在蛋白丝氨酸/苏氨酸磷酸酶活性的差异最显著,细胞成分(CC)富集在质膜部分的差异蛋白数量最多,生物过程(BP)富集在负向调节生物过程、免疫系统过程的差异蛋白数量最多。STRING分析显示差异蛋白Ppp3cb和Slc9a1直接作用,Ppm1g通过Ppp3cb和Slc9a1间接作用,Ppp3cb和Ppm1g之间相互作用。③Ppp3cb的转录和翻译水平减少,在组织中的表达量下降,而Ppm1g转录和翻译水平增加,在组织中的表达量上升(P<0.05)。结论本研究确定了NHE1基因敲除小鼠海马组织中差异蛋白Ppp3cb表达下调,而Ppm1g表达上调,为进一步研究Ppp3cb和Ppm1g参与癫痫发病机制提供了依据。
文摘Objective: To clone the partial sequence of N+/H+ exchanger-1 (NHE-1) gene of human lung cancer cells and insert it reversely into the multiclone site of pLXSN in order to construct an antisense expression vector for tumor gene therapy in vivo. Methods: With use of the upstream and downstream primers containing Barn H I and EcoR I in their5’ ends respectively, a partial sequence of the first exon of NHE-1 gene was cloned in a length of 454 bp from genomic DNA of human lung cancer cell A549 with PCR method. The product was then directionally and reversely insert into the multiclone site of pLXSN. Finally, the constructed recombinant was identified with agarose gel electrophoresis and DNA sequencing. Results: The cloned fragment was 461 bp in length and successfully ligated to pLXSN with the identification by agarose gel electrophoresis. DNA sequencing confirmed that the fragment cloned and inserted into the vector was identical with the targeted one. Conclusion: The targeted fragment is successfully cloned and reversely inserted into pLXSN in our experiment. The antisense expression vector of NHE-1, pNHE-1. was consfructed successfully.
基金National Natural Science Foundation of China (No. 39870352)
文摘Objective : To investigate the effects of the transfection of NHE-1 ribozyme gene on the apoptosis of pulmonary artery smooth muscle cells (PASMC) in vitro. Methods: After NHE-1 ribozyme gene was designed, synthesized and then cloned into plasmid pLXSN, the recombined plasmid was tansfected into cultured rat PASMC. Expression of NHE-1 mRNA was detected with semi-quantitative RT-PCR. Intracellular pH (pHi) was measured by using fluorescence dye BCECF-AM. Cell cycle was measured with aid of flow cy-tometric DNA analysis. Cell apoptosis was observed with electron microscopy and terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling (TUNED respectively. Results: The NHE-1 mRNA expression level and pHi value were significantly lower in PASMCs transfected with NHE-1 ribozyme gene than those transfected with pLXSN or without transfection. Meanwhile, the apoptosis rate of cells transfected with NHE-1 ribozyme gene was increased significantly. Morphology of cell apoptosis was observed in the cells transfected with NHE-1 ribozyme gene under an electron microscope. Conclusion: The transfection of NHE-1 ribozyme gene induces the apoptosis of PASMCs by inhibiting NHE-1 expression and intracellular acidification.
文摘Wingless/Int （Wnt） signaling pathways are signal transduction mechanisms that have been widely studied In the field of embryogen- esis. Recent work has established a critical role for these pathways in brain development, especially of midbrain dopaminergic neu- rones, However, the fundamental importance of Wnt signaling for the normal function of mature neurones in the adult central nervous system has also lately been demonstrated by an increasing number of studies. Parkinson＇s disease （PD） is the second most prevalent neurodegenerative disease worldwide and is currently incurable. This debilitating disease is characterized by the progres- sive loss of a subset of midbrain dopaminergic neurones in the substontla nigm leadingto typical extrapyramidal motor symptoms. The aetiology of PD is poorly understood but work performed over the Last two decades has identified a growing number of genetic defects that underlie this condition. Herewe review a growing body of data connecting genes implicated in PD--most notablythe PARKgenes-- with Wnt signaling. These observations provide clues to the normal function of these proteins in healthy neurones and suggest that deregulated Wnt signaling might be a frequent pathomechanlsm leading to PD. These observations have implications for the patho- genesis and treatment of neurodegenerative diseases in general.
