目的研究依赖性受体Unc5H4诱导人神经母细胞瘤(neuroblastoma,NB)细胞系SH-SY5Y细胞凋亡而其配体Netrin-1抑制其凋亡诱导的作用。方法人NB细胞系SH-SY5Y细胞中转染Unc5H4质粒,在有/无配体Netrin-1作用下进行平板克隆形成实验,探讨Unc5H...目的研究依赖性受体Unc5H4诱导人神经母细胞瘤(neuroblastoma,NB)细胞系SH-SY5Y细胞凋亡而其配体Netrin-1抑制其凋亡诱导的作用。方法人NB细胞系SH-SY5Y细胞中转染Unc5H4质粒,在有/无配体Netrin-1作用下进行平板克隆形成实验,探讨Unc5H4是否诱导细胞凋亡以及诱导细胞凋亡作用是否受Netrin-1蛋白作用的影响。进一步在SH-SY5Y细胞中表达Unc5H4,在阿霉素(ADR)刺激下,在有/无配体Netrin-1蛋白作用时检测Unc5H4蛋白条带的变化,即Unc5H4释放死亡结构域后的截断蛋白诱导细胞凋亡的变化。结果 Caspase-3活性检测结果显示,过表达Unc5H4可诱导SH-SY5Y细胞发生凋亡,其相对Caspase-3活性(180%±20%)明显高于对照组(100%),差异有显著统计学意义(P?0.01)。而加入Netrin-1组细胞的相对Caspase-3活性(112%±14%)明显低于无Netrin-1组(180%?20%),差异有统计学意义(P?0.01),与对照组(100%)相比差异无统计学意义。SH-SY5Y细胞中转染Unc5H4质粒,在同时受到ADR诱导的DNA损伤时,在无Netrin-1蛋白作用下,可以检测到Unc5H4截断蛋白(酶切死亡结构域,60 k Da)的表达,而Netrin-1能够阻止Unc5H4蛋白的截断,从而阻止其诱导凋亡的作用。结论依赖性受体Unc5H4能够诱导人NB细胞凋亡,其配体Netrin-1能够通过阻止其发生蛋白截断而抑制其诱导凋亡的功能,从而使NB细胞获得增殖。展开更多
目的探讨UNC5H3和DCC在胃癌组织的表达,与临床病理特征和增殖的关系以及与患者生存和预后的关系。方法应用组织芯片和免疫组织化学技术,分析60例胃癌组织中UNC5H3、DCC和Ki-67的表达,并对其表达进行相关分析。利用图像分析软件Image-Pro...目的探讨UNC5H3和DCC在胃癌组织的表达,与临床病理特征和增殖的关系以及与患者生存和预后的关系。方法应用组织芯片和免疫组织化学技术,分析60例胃癌组织中UNC5H3、DCC和Ki-67的表达,并对其表达进行相关分析。利用图像分析软件Image-Pro Plus 6.0测量切片积分吸光度,对结果进行验证。采用Kaplan-Meier限乘法计算生存率。建立Cox回归模型,评价UNC5H3和DCC作为胃癌患者预后的独立影响因素的可行性。结果在60例胃癌组织中,UNC5H3、DCC和Ki-67的阳性表达率分别为43.3%、53.3%和60.0%。UNC5H3和DCC与淋巴转移和远处转移之间,差异有显著性(P<0.05)。UNC5H3和DCC表达与Ki-67表达相互之间无相关性(P>0.05)。用Kaplan-Meier生存曲线经Log-rank检验发现,UNC5H3的阳性表达与胃癌患者生存之间存在相关性(P<0.05)。DCC的阳性表达与胃癌患者生存之间无相关性(P>0.05)。经Cox回归分析,UNC5H3和DCC的表达与胃癌患者预后无明显相关性。结论依赖性受体UNC5H3和DCC共同参与了胃癌的发生进展,检测UNC5H3和DCC可作为反映胃癌临床病理学特点的指标,检测UNC5H3可作为胃癌患者生存期的指标,但UNC5H3和DCC的表达不是判断胃癌患者预后的独立影响因素。展开更多
AIM: To explore the role of unc5b in retinal neovascularization in murine oxygen-induced retinopathy (OIR). METHODS: On postnatal 7 (P7), C57BL/6J mice were exposed to 75% +/- 2% oxygen for 5 days. On postnatal 12 (P1...AIM: To explore the role of unc5b in retinal neovascularization in murine oxygen-induced retinopathy (OIR). METHODS: On postnatal 7 (P7), C57BL/6J mice were exposed to 75% +/- 2% oxygen for 5 days. On postnatal 12 (P12), the mice were brought back to the room air (21% oxygen) to induce retinal neovascularization. Western blot analysis was performed to examine the temporal expression of unc5b in murine retinas. Double staining for unc5b and isolectin B4 were employed to determine the location of unc5b in murine retinas. The effect of unc5b on retinal neovascularization was evaluated by intravitreal injection of unc5b-FC in mice with OIR. Retinal neovascularization was measured by counting neovascular cell nuclei above the internal limiting membrane and by angiography of flat-mounted retinas perfused with fluorescein dextran. o RESULTS: Compared to age-matched normal mice, the expression of unc5b was significantly increased in retinas of OIR mice on P17 and P21. Unc5b was apparently expressed in retinal vessels of OIR while being negative in normal retinal vessels. Retinal neovascularization in eyes injected with unc5b-FC was significantly reduced. CONCLUSION: Unc5b-FC can effectively inhibit retinal neovascularization induced by OIR. It may serve as a powerful and novel therapy for ischemia-induced retinal disease.展开更多
文摘目的研究依赖性受体Unc5H4诱导人神经母细胞瘤(neuroblastoma,NB)细胞系SH-SY5Y细胞凋亡而其配体Netrin-1抑制其凋亡诱导的作用。方法人NB细胞系SH-SY5Y细胞中转染Unc5H4质粒,在有/无配体Netrin-1作用下进行平板克隆形成实验,探讨Unc5H4是否诱导细胞凋亡以及诱导细胞凋亡作用是否受Netrin-1蛋白作用的影响。进一步在SH-SY5Y细胞中表达Unc5H4,在阿霉素(ADR)刺激下,在有/无配体Netrin-1蛋白作用时检测Unc5H4蛋白条带的变化,即Unc5H4释放死亡结构域后的截断蛋白诱导细胞凋亡的变化。结果 Caspase-3活性检测结果显示,过表达Unc5H4可诱导SH-SY5Y细胞发生凋亡,其相对Caspase-3活性(180%±20%)明显高于对照组(100%),差异有显著统计学意义(P?0.01)。而加入Netrin-1组细胞的相对Caspase-3活性(112%±14%)明显低于无Netrin-1组(180%?20%),差异有统计学意义(P?0.01),与对照组(100%)相比差异无统计学意义。SH-SY5Y细胞中转染Unc5H4质粒,在同时受到ADR诱导的DNA损伤时,在无Netrin-1蛋白作用下,可以检测到Unc5H4截断蛋白(酶切死亡结构域,60 k Da)的表达,而Netrin-1能够阻止Unc5H4蛋白的截断,从而阻止其诱导凋亡的作用。结论依赖性受体Unc5H4能够诱导人NB细胞凋亡,其配体Netrin-1能够通过阻止其发生蛋白截断而抑制其诱导凋亡的功能,从而使NB细胞获得增殖。
文摘目的探讨UNC5H3和DCC在胃癌组织的表达,与临床病理特征和增殖的关系以及与患者生存和预后的关系。方法应用组织芯片和免疫组织化学技术,分析60例胃癌组织中UNC5H3、DCC和Ki-67的表达,并对其表达进行相关分析。利用图像分析软件Image-Pro Plus 6.0测量切片积分吸光度,对结果进行验证。采用Kaplan-Meier限乘法计算生存率。建立Cox回归模型,评价UNC5H3和DCC作为胃癌患者预后的独立影响因素的可行性。结果在60例胃癌组织中,UNC5H3、DCC和Ki-67的阳性表达率分别为43.3%、53.3%和60.0%。UNC5H3和DCC与淋巴转移和远处转移之间,差异有显著性(P<0.05)。UNC5H3和DCC表达与Ki-67表达相互之间无相关性(P>0.05)。用Kaplan-Meier生存曲线经Log-rank检验发现,UNC5H3的阳性表达与胃癌患者生存之间存在相关性(P<0.05)。DCC的阳性表达与胃癌患者生存之间无相关性(P>0.05)。经Cox回归分析,UNC5H3和DCC的表达与胃癌患者预后无明显相关性。结论依赖性受体UNC5H3和DCC共同参与了胃癌的发生进展,检测UNC5H3和DCC可作为反映胃癌临床病理学特点的指标,检测UNC5H3可作为胃癌患者生存期的指标,但UNC5H3和DCC的表达不是判断胃癌患者预后的独立影响因素。
基金National Natural Science Foundation of China (No.30872822)
文摘AIM: To explore the role of unc5b in retinal neovascularization in murine oxygen-induced retinopathy (OIR). METHODS: On postnatal 7 (P7), C57BL/6J mice were exposed to 75% +/- 2% oxygen for 5 days. On postnatal 12 (P12), the mice were brought back to the room air (21% oxygen) to induce retinal neovascularization. Western blot analysis was performed to examine the temporal expression of unc5b in murine retinas. Double staining for unc5b and isolectin B4 were employed to determine the location of unc5b in murine retinas. The effect of unc5b on retinal neovascularization was evaluated by intravitreal injection of unc5b-FC in mice with OIR. Retinal neovascularization was measured by counting neovascular cell nuclei above the internal limiting membrane and by angiography of flat-mounted retinas perfused with fluorescein dextran. o RESULTS: Compared to age-matched normal mice, the expression of unc5b was significantly increased in retinas of OIR mice on P17 and P21. Unc5b was apparently expressed in retinal vessels of OIR while being negative in normal retinal vessels. Retinal neovascularization in eyes injected with unc5b-FC was significantly reduced. CONCLUSION: Unc5b-FC can effectively inhibit retinal neovascularization induced by OIR. It may serve as a powerful and novel therapy for ischemia-induced retinal disease.
