血管内皮生长因子在大肠癌中的表达及临床意义

目的研究肿瘤生长因子(VEGF)和肿瘤微血管密度(MVD)的表达水平在大肠癌中的临床意义.方法对86例手术切除的大肠癌患者的临床病理资料进行研究,并采用免疫组化方法检测VEGF蛋白和MVD在大肠癌的表达水平.结果VEGF表达阳性率为62.8%.MVD和VEGF表达的程度明显相关.VEGF的阳性表达与组织学类型及肿瘤位置无显著相关(P＞0.05),而与淋巴结转移、肝肺等远处转移及浸润深度有明显相关性(P＜0.05).结论VEGF是由肿瘤细胞所分泌的,并在大肠癌的生长和转移过程中发挥重要的作用.     

结肠癌MMP-9和VEGF的表达及其意义

目的：探讨MMP-9及VEGF在结肠癌的表达特点及其与临床病理改变间的关系。方法：采用免疫组织化学SP法检测结肠腺癌MMP-9、VEGF、Ⅳ型胶原及FⅧAg的表达情况。结果：结肠癌MMP-9蛋白的阳性率为71％，VEGF蛋白的阳性率为80％。MMP-9及VEGF两者呈正相关，共同作用于肿瘤间质血管，至MVD增多。MMP-9和VEGF的表达与肿瘤的侵袭、分化程度及淋巴结转移有关．与患者的年龄、性别和组织分型无关。结论：MMP-9和VEGF参与结肠癌的发生、发展过程，可作为患者预后的判定指标，可为临床建立新的预后指标提供可靠的依据。     

VEGF反义寡核苷酸抑制大鼠胶质瘤生长的时间与剂量的效应关系

目的在大鼠脑内原位注射反义寡核苷酸观察胶质瘤的生长抑制情况的时间与剂量的效应关系。方法所有大鼠均在立体定向导引下右尾状核区接种1×106C6胶质瘤细胞。不同时间和剂量VEGF反义寡核苷酸均在立体定向导引下原穿刺靶点注射。其中实验Ⅰ组在接种细胞的同时原位注射1000μmol/L的VEGF反义寡核苷酸,而实验Ⅱ组则同时注射2000μmol/L的VEGF反义寡核苷酸。对照Ⅰ组为对照。实验Ⅲ和Ⅳ组在细胞接种后的1和2周各原位注射1次,共2次,每次实验Ⅲ组为1000μmol/L、实验Ⅳ组为2000μmol/L的VEGF反义寡苷核酸。对照Ⅱ组为对照。实验V组仅在接种后2周注射1次2000μmol/L的VEGF反义寡核苷酸,并设对照Ⅲ组为对照。实验3周时处死所有的大鼠,解剖出全脑标本,观察肿瘤的生长情况,测量肿瘤大小。结果实验Ⅰ组的抑瘤率为94.5％,实验Ⅱ组的抑瘤率为100％。实验Ⅲ组的抑瘤率为91.5％,实验Ⅳ组为100％,实验Ⅴ组抑瘤率为87.8％。实验组和对照组的肿瘤体积比较有非常显著的差异。结论 原位应用VEGF反义寡核苷酸能取得很好的抗血管生成的治疗效果,抑瘤效果有明显的浓度依赖性。原位早期使用足量反义核酸能取得更好的效果。     

mRNA EXPRESSION OF PTEN AND VEGF GENES IN EPITHELIAL OVARIAN CANCER

VEGF gene, also known as vascular permeability factor, has been mapped to chromosome 6p21.3[11]. Biochemically, it is a heparin binding glycoprotein that has in at least four molecular isoforms, among which, VEGF165 occurs most common. VEGF can act as a specific mitogen for a variety of endothelial cells in vitro and as an angiogenic molecule in vivo [11,12]. VEGF is a potent multifunctional cytokine that exerts several potentially independent actions on the vascular endothelium, includin…     

血管内皮细胞生长因子及其阻断在抗肿瘤中的应用

血管新生是实体瘤生长和转移的必要条件。血管内皮细胞生长因子(VEGF)及其受体在肿瘤血管新生中起重要作用，阻断VEGF的生成已成为抗肿瘤治疗的新靶点。     

Elevated ocular levels of vascular endothelial growth factor in patients with von Hippel-Lindau disease

Background: Von Hippel–Lindau disease (VHL) is a rare autosomal dominant inherited disorder characterized by highly vascularized tumors in various organs. The abundant presence of endothelial cells in VHL tumors strongly suggest a role of the VHL tumor suppressor gene in the regulation of angiogenesis. Recently, in vitro studies have shown that the VHL tumor suppressor gene regulates the expression of vascular endothelial growth factor (VEGF). We investigated whether VHL patiens have increased levels of VEGF in their body fluids.Patients and methods: The concentration of VEGF was measured in fluid of the anterior chamber of the eye, serum, urine, and fluid from renal cysts of VHL patients and unaffected individuals by ELISA. In addition, levels of basic fibroblast growth factor (bFGF), interleukin-8 (IL-8) and endothelin-1 (ET-1) were measured in urine and serum of VHL patients and control subjects.Results: In 80% of the VHL patients VEGF was detectable in aqueous fluid of the anterior chamber of their eyes. A strong positive correlation (r = 0.90) was found between the age of VHL patients and ocular VEGF concentrations. At comparable age, VEGF levels in ocular fluid of VHL patients were significantly higher (P < 0.001) than in unaffected subjects. No correlation was found between VEGF concentration and the presence of retinal angiomas. A 10 and 16 fold increase of VEGF concentration was seen in fluid from two independent VHL-related cysts as compared with VEGF serum levels of the same patient. The mean concentration of VEGF in serum of VHL patients (n = 15) (319 ± 84 pg/ml) was higher than in matched controls (238 ± 68 pg/ml; P = NS). The mean concentration of VEGF in urine of VHL patients (128 ± 36 pg/ml) was lower than in matched controls (183 ± 25 pg/ml; P = NS). Concentrations of VEGF did not correlate with the presence of VHL-related tumors. No differences were observed between concentrations of bFGF, IL-8 and ET-1 in serum and urine of VHL patients and matched controls.Conclusions: These findings support a role for the VHL tumor suppressor gene in the in vivo regulation of VEGF.     

VEGF受体flk-1的表达与喉粘膜上皮癌变发生和转移的关系

 目的:观察血管内皮生长因子(VEGF)受体flk－1在不典型增生及鳞癌中的表达,用图象分析系统定量的方法观察flk-1与喉癌的生长、浸润及转移的关系。方法:用抗flk－1抗体,在经过微波处理组织暴露抗原后,进行标准化的EliteABC染色,并通过图象分析系统确定flk-1在不典型增生、鳞癌中的表达。结果:在不典型增生及鳞癌中flk－1均有表达。在组织中,flk－1不仅在血管内皮细胞中、在部分浆细胞和巨噬细胞中也呈阳性反应。鳞癌组中的flk－1的表达明显高于不典型增生组(P<0.05)。在鳞癌中,随着分化程度的下降,flk-1表达有逐渐递增的趋势。在鳞癌组中发生转移的病变flk-1的表达明显高于未转移组(P<0.05)。相关分析显示flk－1的表达与肿瘤的临床分期密切相关。结论:VEGF通过自分泌和旁分泌的途径影响肿瘤细胞生长及间质中新生血管的形成,肿瘤细胞的生长与血管的发生相互依赖。flk-1与喉癌的生长、浸润及转移密切相关,flk-1可能作为一个判断预后的重要指标。     

VEGF受体flk-1的表达与喉粘膜上皮癌变发生和转移的关系

目的：观察血管内皮生长因子（VEGF）受体flk－1在不典型增生及鳞癌中的表达，用图象分析系统定量的方法观察flk-1与喉癌的生长、浸润及转移的关系。方法：用抗flk－1抗体，在经过微波处理组织暴露抗原后，进行标准化的EliteABC染色，并通过图象分析系统确定flk-1在不典型增生、鳞癌中的表达。结果：在不典型增生及鳞癌中flk－1均有表达。在组织中，flk－1不仅在血管内皮细胞中、在部分浆细胞和巨噬细胞中也呈阳性反应。鳞癌组中的flk－1的表达明显高于不典型增生组（P<0．05）。在鳞癌中，随着分化程度的下降，flk-1表达有逐渐递增的趋势。在鳞癌组中发生转移的病变flk-1的表达明显高于未转移组（P<0．05）。相关分析显示flk－1的表达与肿瘤的临床分期密切相关。结论：VEGF通过自分泌和旁分泌的途径影响肿瘤细胞生长及间质中新生血管的形成，肿瘤细胞的生长与血管的发生相互依赖。flk-1与喉癌的生长、浸润及转移密切相关，flk-1可能作为一个判断预后的重要指标。     

EXPRESSION OF VEGF RECEPTOR KDR IN DIFFERENT ORIGINATED CARCINOMAS

Ａｎｇｉｏｇｅｎｅｓｉｓｉｓｔｈｅｐｒｅｒｅｑｕｉｓｉｔｅｏｆｓｏｌｉｄｔｕｍｏｒｇｒｏｗｔｈ．１Ｄｕｒｉｎｇｔｈｅｐｒｏｃｅｓｏｆｔｕｍｏｒｐｒｏｇｒｅｓｉｏｎ，ｔｕｍｏｒｃｅｌｓｃａｎｓｅｃｒｅｔｅｖａｒｉｏｕｓａｎｇｉｏｇｅｎｉｃｆａｃｔｏｒｓ...     

血管内皮生长因子和新生血管在非小细胞肺癌中的表达及其意义

目的研究血管内皮生长因子（vascular endothelial growth factor, VEGF）和新生血管在不同分期非小细胞肺癌（non-small cell lung cancer,NSCLC）中的表达及其相互关系. 方法共收集79例原发性NSCLC手术标本和12例尸检正常肺组织,用免疫组织化学法（S-P法）检测,用免疫组化图象分析系统进行结果处理. 结果非小细胞肺癌中VEGF和新生血管的表达水平与正常肺组织相比差异具有显著性（P〈0.05）;Ⅰ期与Ⅱ期及Ⅲ期之间相比,VEGF和新生血管的表达水平差异同样具有显著性,并且随分期越晚表达越强（P〈0.05）;不同细胞类型之间的差异无显著性（P〉0.05）.结论 VEGF的表达水平与新生血管的表达成正相关.