Treatment of gastrointestinal bleeding in patients with angiodysplasias and Osler’s disease (hereditary hemorrhagic teleangiectasia) is clinically challenging. Frequently, vascular malformations occur as multiple dis...Treatment of gastrointestinal bleeding in patients with angiodysplasias and Osler’s disease (hereditary hemorrhagic teleangiectasia) is clinically challenging. Frequently, vascular malformations occur as multiple disseminated lesions, making local treatment an unfavorable choice or impossible. After local therapy, lesions often recur at other sites of the intestine. However, as there are few therapeutic alternatives, repeated endoscopic coagulations or surgical resections are still performed to prevent recurrent bleeding. Hormonal therapy has been employed for more than 50 years but has recently been shown to be ineffective. Therefore, new therapeutic strategies are required. Understanding of the pathophysiology of angiogenesis and vascular malformations has recently substantially increased. Currently, multiple inhibitors of angiogenesis are under development for treatment of malignant diseases. Experimental and clinical data suggest that antiangiogenic substances, which were originally developed for treatment of malignant diseases, may also represent long-awaited specif ic drugs for the treatment of vascular malformations. However, antiangiogenics display significantly different actions and side-effects. Although antiangiogenics like thalidomide seem to inhibit gastrointestinal bleeding, other substances like bevacizumab can cause mucosal bleeding. Therefore differential and cautious evaluation of this therapeutic strategy is necessary.展开更多
BACKGROUND:This study was undertaken to investigate the expression of hypoxia-inducible factor-1a(HIF-1a) in rat cerebral cortex and the effects of p-sodium aescinate(SA) administration after return of spontaneous cir...BACKGROUND:This study was undertaken to investigate the expression of hypoxia-inducible factor-1a(HIF-1a) in rat cerebral cortex and the effects of p-sodium aescinate(SA) administration after return of spontaneous circulation(ROSC).METHODS:Sixty rats were divided into three groups:SA group,injected intraperitoneally with SA instantly after ROSC;control group,injected intraperitoneally with normal saline;and shamoperated group,without cardiac arrest or SA.The cardiac arrest model was established using asphyxiation and intravenous potassium chloride.Blood was sampled 1,6,12,and 24 hours after ROSC.Protein and mRNA levels of HIF-1a,VEGF and EPO were detected in the cerebral cortex by immunohistochemistry and real-time RT-PCR;serum levels of NSE and S100 P were determined by enzyme-linked immunosorbent assays.RESULTS:Serum S100β and NSE were significantly increased in the control group versus the sham-operated group 1,6,12 and 24 hours after ROSC(P<0.05).Protein and mRNA levels of HIF-1a,VEGF and EPO were significantly increased in the control rats(P<0.05).Serum NSE and S100 P were significantly decreased in the SA group versus the control group 1,6,12 and 24 hours after ROSC(P<0.05).Protein and mRNA levels of HIF-1a,VEGF and EPO were significantly increased in the SA group(P<0.05).CONCLUSIONS:The expression of HIF-1a is increased in rat cerebral cortex after ROSC,and SA up-regulates the expression of HIF-1α.The up-regulation of HIF-1α improves the resistance of the cortex to ischemia and hypoxia and contributes to neuroprotection,possibly because of up-regulation of EPO and VEGF expression.展开更多
目的研究血管内皮生长因子（vascular endothelial growth factor，VEGF），信号传导与转录激活因子3（signal transducer and activator of transcription3，Stat3）和低氧诱导因子HIF-1α（hypoxia-induciblefactor-1α，HIF-...目的研究血管内皮生长因子（vascular endothelial growth factor，VEGF），信号传导与转录激活因子3（signal transducer and activator of transcription3，Stat3）和低氧诱导因子HIF-1α（hypoxia-induciblefactor-1α，HIF-1α）在肾母细胞瘤（Wilms’tumor，WT）中的表达及其临床意义。方法应用免疫组化SABC法辅以计算机图像分析的方法，研究Stat3，HIF-1α与VEGF在52例WT组织，47例瘤旁组织及8例正常肾组织表达强度情况。结果VEGF，Stat3及HIF-1α在WT组织中表达强度较瘤旁组织及正常肾组织显著增强（P〈0．05），且瘤旁组织中VEGF表达强度高于正常肾组织。另外，临床分期Ⅲ～Ⅳ和预后不良病理类型的WT中Stat3及VEGF表达强度明显高于临床分期Ⅰ～Ⅱ的WT，预后不良病理类型及直径≥6cm的WT中HIF-1α表达强度较预后良好型及直径〈6cm的WT升高。结论VEGF，Stat3及HIF-1α表达与肾母细胞瘤的发展预后有关，参与了肿瘤血管的生成及肿瘤的增殖侵袭，Stat3可能对HIF-1和VEGF的表达起着重要的调控作用，对于靶向治疗肾母细胞瘤具有一定意义。展开更多
基金Supported in part by research grants from the National Natural Science Foundation of China,No.30300298the National Natural Science Foundation of China's Joint Research Fund for Overseas Chinese Young Scholars,No.30228026
文摘Treatment of gastrointestinal bleeding in patients with angiodysplasias and Osler’s disease (hereditary hemorrhagic teleangiectasia) is clinically challenging. Frequently, vascular malformations occur as multiple disseminated lesions, making local treatment an unfavorable choice or impossible. After local therapy, lesions often recur at other sites of the intestine. However, as there are few therapeutic alternatives, repeated endoscopic coagulations or surgical resections are still performed to prevent recurrent bleeding. Hormonal therapy has been employed for more than 50 years but has recently been shown to be ineffective. Therefore, new therapeutic strategies are required. Understanding of the pathophysiology of angiogenesis and vascular malformations has recently substantially increased. Currently, multiple inhibitors of angiogenesis are under development for treatment of malignant diseases. Experimental and clinical data suggest that antiangiogenic substances, which were originally developed for treatment of malignant diseases, may also represent long-awaited specif ic drugs for the treatment of vascular malformations. However, antiangiogenics display significantly different actions and side-effects. Although antiangiogenics like thalidomide seem to inhibit gastrointestinal bleeding, other substances like bevacizumab can cause mucosal bleeding. Therefore differential and cautious evaluation of this therapeutic strategy is necessary.
基金supported by the Liaoning Province Natural Science Foundation(20092162)
文摘BACKGROUND:This study was undertaken to investigate the expression of hypoxia-inducible factor-1a(HIF-1a) in rat cerebral cortex and the effects of p-sodium aescinate(SA) administration after return of spontaneous circulation(ROSC).METHODS:Sixty rats were divided into three groups:SA group,injected intraperitoneally with SA instantly after ROSC;control group,injected intraperitoneally with normal saline;and shamoperated group,without cardiac arrest or SA.The cardiac arrest model was established using asphyxiation and intravenous potassium chloride.Blood was sampled 1,6,12,and 24 hours after ROSC.Protein and mRNA levels of HIF-1a,VEGF and EPO were detected in the cerebral cortex by immunohistochemistry and real-time RT-PCR;serum levels of NSE and S100 P were determined by enzyme-linked immunosorbent assays.RESULTS:Serum S100β and NSE were significantly increased in the control group versus the sham-operated group 1,6,12 and 24 hours after ROSC(P<0.05).Protein and mRNA levels of HIF-1a,VEGF and EPO were significantly increased in the control rats(P<0.05).Serum NSE and S100 P were significantly decreased in the SA group versus the control group 1,6,12 and 24 hours after ROSC(P<0.05).Protein and mRNA levels of HIF-1a,VEGF and EPO were significantly increased in the SA group(P<0.05).CONCLUSIONS:The expression of HIF-1a is increased in rat cerebral cortex after ROSC,and SA up-regulates the expression of HIF-1α.The up-regulation of HIF-1α improves the resistance of the cortex to ischemia and hypoxia and contributes to neuroprotection,possibly because of up-regulation of EPO and VEGF expression.
文摘目的研究血管内皮生长因子（vascular endothelial growth factor，VEGF），信号传导与转录激活因子3（signal transducer and activator of transcription3，Stat3）和低氧诱导因子HIF-1α（hypoxia-induciblefactor-1α，HIF-1α）在肾母细胞瘤（Wilms’tumor，WT）中的表达及其临床意义。方法应用免疫组化SABC法辅以计算机图像分析的方法，研究Stat3，HIF-1α与VEGF在52例WT组织，47例瘤旁组织及8例正常肾组织表达强度情况。结果VEGF，Stat3及HIF-1α在WT组织中表达强度较瘤旁组织及正常肾组织显著增强（P〈0．05），且瘤旁组织中VEGF表达强度高于正常肾组织。另外，临床分期Ⅲ～Ⅳ和预后不良病理类型的WT中Stat3及VEGF表达强度明显高于临床分期Ⅰ～Ⅱ的WT，预后不良病理类型及直径≥6cm的WT中HIF-1α表达强度较预后良好型及直径〈6cm的WT升高。结论VEGF，Stat3及HIF-1α表达与肾母细胞瘤的发展预后有关，参与了肿瘤血管的生成及肿瘤的增殖侵袭，Stat3可能对HIF-1和VEGF的表达起着重要的调控作用，对于靶向治疗肾母细胞瘤具有一定意义。
