目的:探究Rho-GTPase激活蛋白15(Rho-GTPase activating protein 15,ARHGAP15)在乳腺癌中的表达及临床意义。方法:利用TCGA数据库检测ARHGAP15在乳腺癌中的表达,采用Kaplan-Meier、Logistics回归分析和单因素/多因素COX回归分析检测ARHG...目的:探究Rho-GTPase激活蛋白15(Rho-GTPase activating protein 15,ARHGAP15)在乳腺癌中的表达及临床意义。方法:利用TCGA数据库检测ARHGAP15在乳腺癌中的表达,采用Kaplan-Meier、Logistics回归分析和单因素/多因素COX回归分析检测ARHGAP15与临床预后相关性。同时收集我院61例乳腺癌患者病理切片,检测ARHGAP15在乳腺癌中的表达并分析其与临床相关性。体外实验检测ARHGAP15对MCF-7和MDA-MB-231细胞的增殖和凋亡的影响。结果:TCGA数据库中ARHGAP15与T、N、M分期、预后、病理分级和年龄相关。本研究临床样本显示,ARHGAP15在乳腺癌中低表达,且与肿瘤直径、TNM分期、淋巴结转移和分子分型相关。COX单因素分析结果显示,TNM分期Ⅲ期、分子类型为三阴性、肿瘤直径≥3 cm与ARHGAP15低表达是影响乳腺癌患者预后的危险因素;多因素分析结果显示:肿瘤直径≥3 cm与ARHGAP15低表达是影响乳腺癌预后的危险因素。CCK-8和克隆实验发现过表达ARHGAP15抑制乳腺癌细胞增殖。细胞凋亡实验发现,ARHGAP15过表达组凋亡率较高。结论:ARHGAP15基因影响乳腺癌细胞的增殖和凋亡,且ARHGAP15低表达与乳腺癌的不良预后结局相关。展开更多
Objective:To explore effect of srGAP3 promotes neurite outgrowth of dorsal root ganglion neurons.Methods:In this study,expression of Slit1 was observed predominantly in the glia.while expression of Robo2 and srCAP3 wa...Objective:To explore effect of srGAP3 promotes neurite outgrowth of dorsal root ganglion neurons.Methods:In this study,expression of Slit1 was observed predominantly in the glia.while expression of Robo2 and srCAP3 was detected in sensory neurons of postnatal rat cultured dorsal root ganglion(DRG).Furthermore,upregulation of srGAP3 following sciatic nerve transection was detected by immunohistochemistry and Western blotting.Results:It was observed that inhibition of nenrite outgrowth in cultured adult DRG neurons following treatment with anti-srGAP3 or anti-Robo2 was more effectively(1.5-fold higher) than that following treatment with an anti-BDNF positive control antibody.It demonstrated that srGAP3 interacted with Robo2 and Slit1 protein to decrease Rac1-CTP activity in cultured adult rat DRG neurons and the opposite effect on Rac1-GTP activity was detected by co-immunoprecipitation and immunoblotting analyses following treatment with anti-Robo2 or anti-srGAP3.These data demonstrated a role for srGAP3 in nenrite outgrowth ol DRG sensory neurons.Conclusions:Our observations suggest that srGAP3 promotes neurile outgrowth and filopodial growth cones by interacting with Robo2 to inactivate Rac1 in mammalian DRG neurons.展开更多
目的:探讨牙龈卟啉单胞菌(Pg)细胞分裂蛋白质FtsZ(PgFtsZ)的GTPase活性的热稳定性,阐明PgFtsZ的生物化学特性,为牙周病的治疗提供实验依据。方法:采用Malachite green assay法检测GTPase的活性,活性测定蛋白质为重组野生型PgFtsZ(WtPgFt...目的:探讨牙龈卟啉单胞菌(Pg)细胞分裂蛋白质FtsZ(PgFtsZ)的GTPase活性的热稳定性,阐明PgFtsZ的生物化学特性,为牙周病的治疗提供实验依据。方法:采用Malachite green assay法检测GTPase的活性,活性测定蛋白质为重组野生型PgFtsZ(WtPgFtsZ)和4种重组C末端缺失变异型PgFtsZ,即ZΔC01(C末端缺失73个氨基酸残基)、ZΔC02(C末端缺失128个氨基酸残基)、ZΔC03(C末端缺失177个氨基酸残基)和ZΔC04(C末端缺失233个氨基酸残基),各种PgFtsZ在未经处理时及煮沸加热处理5和10min后检测GTPase的酶活力值。结果:重组ZΔC04GTPase的活性在煮沸加热处理5和10min时均比未加热处理时的酶活性增加(P<0.05),重组WtPgFtsZ、ZΔC01、ZΔC02和ZΔC03在煮沸加热处理5min时GTPase的活性均较未煮沸加热处理时的活性增加(P<0.05),但进一步煮沸加热处理10min时,其GTPase的活性与未加热处理时相似。结论:Pg FtsZ是一种耐热蛋白质,并且C末端缺失233个氨基酸残基的缺失变异型ZΔC04表现出更强的耐热性能。展开更多
基金supported by grants from the National Natural Science Foundation of China(81160158)H0911)Hainan Provincial Science and Technology Bureau
文摘Objective:To explore effect of srGAP3 promotes neurite outgrowth of dorsal root ganglion neurons.Methods:In this study,expression of Slit1 was observed predominantly in the glia.while expression of Robo2 and srCAP3 was detected in sensory neurons of postnatal rat cultured dorsal root ganglion(DRG).Furthermore,upregulation of srGAP3 following sciatic nerve transection was detected by immunohistochemistry and Western blotting.Results:It was observed that inhibition of nenrite outgrowth in cultured adult DRG neurons following treatment with anti-srGAP3 or anti-Robo2 was more effectively(1.5-fold higher) than that following treatment with an anti-BDNF positive control antibody.It demonstrated that srGAP3 interacted with Robo2 and Slit1 protein to decrease Rac1-CTP activity in cultured adult rat DRG neurons and the opposite effect on Rac1-GTP activity was detected by co-immunoprecipitation and immunoblotting analyses following treatment with anti-Robo2 or anti-srGAP3.These data demonstrated a role for srGAP3 in nenrite outgrowth ol DRG sensory neurons.Conclusions:Our observations suggest that srGAP3 promotes neurile outgrowth and filopodial growth cones by interacting with Robo2 to inactivate Rac1 in mammalian DRG neurons.
文摘目的:探讨牙龈卟啉单胞菌(Pg)细胞分裂蛋白质FtsZ(PgFtsZ)的GTPase活性的热稳定性,阐明PgFtsZ的生物化学特性,为牙周病的治疗提供实验依据。方法:采用Malachite green assay法检测GTPase的活性,活性测定蛋白质为重组野生型PgFtsZ(WtPgFtsZ)和4种重组C末端缺失变异型PgFtsZ,即ZΔC01(C末端缺失73个氨基酸残基)、ZΔC02(C末端缺失128个氨基酸残基)、ZΔC03(C末端缺失177个氨基酸残基)和ZΔC04(C末端缺失233个氨基酸残基),各种PgFtsZ在未经处理时及煮沸加热处理5和10min后检测GTPase的酶活力值。结果:重组ZΔC04GTPase的活性在煮沸加热处理5和10min时均比未加热处理时的酶活性增加(P<0.05),重组WtPgFtsZ、ZΔC01、ZΔC02和ZΔC03在煮沸加热处理5min时GTPase的活性均较未煮沸加热处理时的活性增加(P<0.05),但进一步煮沸加热处理10min时,其GTPase的活性与未加热处理时相似。结论:Pg FtsZ是一种耐热蛋白质,并且C末端缺失233个氨基酸残基的缺失变异型ZΔC04表现出更强的耐热性能。