血管内皮生长因子-C与环氧化酶-2在食管癌微血管形成中的作用研究

目的探讨食管癌中VEGF-C与环氧化酶-2的表达以及微血管之间的关系。方法对23例食管癌手术切除标本进行免疫组织化学染色。结果VEGF-C的表达与COX-2的表达相关(r=0.236,P=0.032),新生微血管数量随VEGF-C表达的增强而增多。结论食管癌中VEGF-C与环氧化酶2的表达具有相关性,对新生微血管有促进作用。     

血管内皮生长因子及其受体flt-1在宫颈癌中的表达和意义

我们拟通过观察血管内皮生长因子 (ＶＥＧＦ)与其受体ｆｌｔ 1在宫颈癌中的表达 ,探讨其与宫颈癌的生长、浸润、转移的关系 ,及其在间质血管生成中的作用和相互关系。一、材料和方法收集 1998年 9月至 2 0 0 0年 8月白求恩医科大学第一、二临床学院及吉林省肿瘤医院手术切除宫颈癌标本 72例 ,慢性宫颈炎 6例 ,患者术前均未经任何抗癌治疗 ,确诊为宫颈癌 ,其中腺癌 7例 ,鳞癌 6 5例。患者平均年龄 45岁 ,最大为 5 6岁 ,最小为 2 7岁。组织经常规石蜡包埋后做 4μｍ连续切片 ,行ＨＥ和免疫组织化学链霉素抗生物素 过氧化酶 (ＳＰ)法染色。一…     

环氧化酶-2在肺纤维化大鼠中的表达及其意义

目的:观察环氧化酶-2(COX-2)在肺组织中的分布及其抑制剂对博莱霉素(BLM)诱导的大鼠肺纤维化模型的干预作用.方法:雄性SD大鼠72只随机分为3组,分别为对照组、模型组、塞来昔布组.采用免疫组织化学方法检测各组急性肺泡炎期肺部COX-2的表达和分布;HE和Masson染色方法观察肺泡炎和肺纤维化的程度.结果:(1)在肺纤维化早期,模型组和塞来昔布组均可见COX-2的表达,其主要分布在细支气管上皮细胞中,以模型组表达显著.(2)与对照组相比,模型组和塞来昔布组肺泡炎改变明显(P＜0.01);塞来昔布干预组的肺泡炎症与模型组比较有所减轻(P＜0.05).(3)于实验第28、42天,模型组和塞来昔布组均可见肺纤维化改变,与对照组比较差异显著(P＜0.01);但塞来昔布干预组与模型组比较无显著性差异(P＞0.05).结论:COX-2在肺纤维化早期高度表达,其主要分布在细支气管上皮细胞中;COX-2抑制剂可减轻早期肺泡炎症,对后期肺纤维化无明显抑制作用.     

环氧化酶2、骨形态形成蛋白2和血管内皮生长因子在异位骨化组织中的表达

背景：研究发现环氧化酶2抑制剂具有预防肘关节周围异位骨化的作用。 目的：观察环氧化酶2、骨形态形成蛋白2和血管内皮生长因子在肘关节创伤后异位骨化组织中的表达,并分析其相关性。 方法：采用免疫组化SP法检测18例肘关节创伤后异位骨化组织及10例正常骨组织中环氧化酶2、骨形态形成蛋白2和血管内皮生长因子的表达水平,利用HPIAS-1000图像分析系统测定异位骨化组织与正常骨组织中环氧化酶2、骨形态形成蛋白2和血管内皮生长因子的平均吸光度和阳性区域面积百分率,并分析3种蛋白阳性区域面积百分率之间的相关性。 结果与结论：异位骨化组织中环氧化酶2、骨形态形成蛋白2和血管内皮生长因子呈高表达;正常骨组织中呈低表达或不表达。图像分析结果显示异位骨化组织中3种蛋白平均吸光度及阳性区域面积百分率显著高于正常骨组织(P < 0.01)。异位骨化组织中环氧化酶2与骨形态形成蛋白2、血管内皮生长因子的阳性区域面积百分率呈正相关(P < 0.01)。提示环氧化酶2、骨形态形成蛋白2和血管内皮生长因子在异位骨化的形成过程中起重要作用,环氧化酶2可能通过诱导骨形态形成蛋白2和血管内皮生长因子的表达从而促进异位骨化组织中的成骨和血管形成。     

血管内皮生长因子、环氧化酶-2和基质金属蛋白酶-9在乳腺癌中的表达与超声征象的相关性研究

目的 通过比较乳腺癌组织中血管内皮生长因子(VEGF)、环氧化酶-2(COX-2)、基质金属蛋白酶-9(MMP-9)三种蛋白的表达与乳腺癌超声重要征象的关系,初步探讨乳腺癌超声征象与分子病理学之间的关系,对乳腺癌患者的早期诊断、治疗及预后提供一定理论依据.方法 收集术后经病理证实的89例乳腺癌的标本,所有标本术前均用双盲法由从事多年乳腺超声诊断的医师按照BI-RADS分级法进行分组,同时每个病例均通过免疫组化法检测VEGF、COX-2、MMP-9的水平,分析VEGF、COX-2、MMP-9的表达与超声表现的相关性.结果 超声有毛刺征组乳腺癌VEGF、COX-2、MMP-9表达阳性率较无毛刺征组(P＜0.05)明显增高.钙化组与无钙化组VEGF、COX-2、MMP-9表达阳性率无明显差异(P＞0.05).有血管异常征组VEGF、COX-2、MMP-9表达阳性率较无血管异常征组(P＜0.05)明显增高.淋巴结转移征组VEGF、COX-2、MMP-9表达的阳性率较无淋巴结转移征组(P＜0.05)明显增高.结论 VEGF、COX-2、MMP-9的表达水平对乳腺癌超声征象的出现存在影响,并可作为乳腺癌超声征象中恶性征象的生物学基础,同时提示了有此类超声征象的乳腺癌预后差.     

表皮生长因子受体和环氧合酶-2在宫颈癌中的表达及临床诊断意义

目的 探讨宫颈癌组织中表皮生长因子受体(epidermal growth factor receptor,EGFR)和环氧合酶2(cyclooxygenase,COX-2)蛋白的表达及其与临床病理特征的关系.方法 采用免疫组化的方法分别检测正常宫颈、宫颈癌中EGFR和COX-2蛋白的表达.结果 EGFR和COX-2蛋白的在宫颈癌组织中的阳性表达率,均显著高于正常宫颈组织.EGFR和COX-2的阳性表达均与患者的年龄及肿瘤大小无关(P＞0.05).多元生存分析显示,EGFR和COX-2是独立的预后因子,相对危险度分别为2.52(P=0.004)和1.88(P=0.039).结论 EGFR和COX-2在宫颈组织中的表达水平可能与肿瘤的发生、发展、浸润和转移密切相关,可作为宫颈癌恶性程度判断和预后的重要指标.     

Raf激酶抑制蛋白在宫颈癌中的表达及其临床意义

目的 探讨Raf激酶抑制蛋白(Raf kinase inhibitor protein,RKIP)在宫颈癌中的表达及其临床意义.方法 应用免疫组织化学方法检测RKIP在正常官颈组织、官颈上皮内瘤变组织、官颈癌及其转移淋巴结组织的表达,并在体外应用RT- PCR及Western印迹方法检测RKIP mRNA及蛋白在4种不同来源的宫颈癌细胞系中的表达情况,探讨其与官颈癌临床病理学特征的关系.结果 RKIP在宫颈癌转移淋巴结中的阳性表达率低于宫颈癌组织;RKIP在宫颈癌组织的表达低于正常宫颈组织及宫颈上皮内瘤变组织,差异有统计学意义(x2 =9.211,P＜0.05);而RKIP在正常官颈组织及官颈上皮内瘤变组织的表达差异无统计学意义(x2=0.805,P＞ 0.05);RKIP在宫颈癌组织中的表达与淋巴结转移有关(x2=10.341,P＜0.05),与肿瘤的病理类型、分化程度及临床分期无关(x2分别为0.190、4.101、1.402,P＞0.05).RT- PCR及Western印迹结果显示RKIP在高侵袭性宫颈癌细胞系Caski中的表达低于其他各组(x2=4.08,P＜0.05).结论 RKIP基因在宫颈上皮内瘤变向官颈癌转变中可能起重要作用,是官颈癌发生淋巴结转移的重要标记.     

环氧化酶-2及其研究进展

环氧化酶有两种同工酶,环氧化酶-2(COX-2)是受细胞内外相应刺激如细胞多糖、细胞因子作用合成的诱导型酶。COX-2在基因结构、表达调控、编码蛋白、定位分布上均与COX-1不完全相同。COX-2是炎症过程中一个重要的诱导酶,在肿瘤的形成与发展过程中也有一定作用。     

环氧化酶-2在鼻咽癌中的表达及其临床意义

目的 探讨环氧化酶-2(COX-2)在鼻咽癌中的表达情况及其与淋巴结转移的关系和可能机制。方法 应用免疫组织化学方法(SABC法)，检测62例鼻咽癌病人(其中颈部淋巴结转移者18例)中COX-2、VEGF的表达和微血管密度(MVD)。结果 COX-2在鼻咽癌中有高度表达，其表达阳性率为77．42％，且与鼻咽癌中VEGF表达、微血管密度和颈淋巴结转移密切相关(P＜0．01)。结论 COX-2的高度表达在鼻咽癌的发生、发展及淋巴结转移中起重要作用，且这种作用可能通过上调VEGF的表达来实现的。     

血管内皮生长因子-C和血管内皮生长因子受体-3在侵袭性甲状腺乳头状癌中的表达及意义

目的 观察血管内皮生长因子(VEGF-C)和血管内皮生长因子受体(VEGFR3)在侵袭性甲状腺乳头状癌组织中的表达,探讨甲状腺乳头状癌细胞淋巴管转移机理.方法 用免疫组化方法检测VEGF-C和VEGFR3在人侵袭性甲状腺乳头状癌和非侵袭性甲状腺乳头状癌中的表达情况,并进行比较和分析.结果 在侵袭性和非侵袭性甲状腺乳头状癌中均可见到VEGF-C和VEGFR3阳性表达,但在侵袭性甲状腺乳头状癌组织VEGF-C (x2=4.738,P=0.030)和VEGFR3(x2=11.951,P=0.010)的表达率和表达强度均高于非侵袭性甲状腺乳头状癌.结论 VEGF-C和VEGFR3在侵袭性甲状腺乳头状癌细胞中高表达,并且可能与此肿瘤的侵袭性相关.     

血管内皮生长因子C促进HeLa宫颈癌细胞粘着斑激酶活性的研究

目的探讨粘着斑激酶（focal adhesion kinase,FAK）介导血管内皮细胞生长因子C（vascular endothelial growth factor C,VEGF—C）促宫颈癌恶性进展的作用。方法提取不同病理分期的宫颈癌组织标本蛋白．采用Western-blot检测VEGF．C及FAK蛋白的表达情况。在体外培养宫颈癌细胞株HeLa细胞,采用Western—blot测定VEGF—C对FAK蛋白的表达和磷酸化的调控作用。结果随着宫颈癌恶性程度的增高,VEGF-C、FAK蛋白及磷酸化FAK蛋白表达水平均随之增加。与正常宫颈组织比较,宫颈原位癌（CIN）组织中VEGF．C、FAK、磷酸化FAK蛋白表达分别增加了（48±10）％、（78±14）％、（83±15）％,P〈0．05;宫颈鳞癌Ⅰ期各蛋白增高幅度分别为（104±22）％、（121±28）％、（143±30）％（P〈0．01）;宫颈鳞癌Ⅱ期（未放疗、化疗）各蛋白表达增高更为显著,其幅度分别为（195±28）％、（186±22）％、（204±31）％,P〈0．001。在培养的宫颈癌细胞株HeLa细胞上,VEGF—C（100μg／L）处理24h后,可显著增高FAK蛋白、磷酸化FAK蛋白的表达,该作用可被VEGF—C单克隆抗体明显抑制。结论VEGF—C、FAK蛋白表达与宫颈癌恶性程度密切相关,VEGF—C可能通过上调FAK表扶殛苴磷酪化水平而但讲宫颈癌的熏忡讲犀     

Immunohistochemical Expression of Vascular Endothelial Growth Factor and Vascular Endothelial Growth Factor Receptor in Canine Cutaneous Fibrosarcomas

The expression of five markers associated with tumour angiogenesis, proliferation and apoptosis was studied in 24 canine cutaneous fibrosarcomas. Tumours were assigned histological grades and were immunohistochemically evaluated for the expression of vascular endothelial growth factor (VEGF) and vascular endothelial growth factor receptor-2 (VEGFR-2). Additionally, intra-tumour microvessel density (iMVD) was assessed by immunohistochemical labelling for expression of von Willebrand factor (vWf) and tumour proliferation index (PI) was measured following labelling of Ki-67 antigen. Finally, tumour apoptotic index (AI) was determined by application of the terminal deoxynucleotidyl transferase (TdT)-mediated dUTP end-labelling method (TUNEL). VEGF and VEGFR-2 expression were detected in 22/24 (92%) and 24/24 (100%) of fibrosarcomas, respectively. There was correlation between VEGF and VEGFR-2 expression (r = 0.51) and between histological grade and PI (r = 0.82). A significant difference in PI between tumours of different histological grade was found (P < 0.05). The median PI in grade 2 and 3 tumours (30.6 and 54.7, respectively) was significantly higher than in grade 1 tumours (6.4). Therefore, only PI correlates significantly with the histological grade of canine cutaneous fibrosarcomas. The potential for autocrine activity for VEGF exists in canine cutaneous fibrosarcomas, as VEGF and VEGFR-2 expression was found in most tumours.     

乳腺癌患者血清Leptin和VEGF的表达

目的：研究瘦素（Leptin）、血管内皮生长因子（VEGF）在乳腺癌患者血清中的表达，探讨其在乳腺癌诊断中的意义。方法：选择乳腺癌患者36例，乳腺良性增生病变患者31例，另选56例健康女性作为对照。分别用放射免疫分析（RIA）和酶联免疫吸附试验（ELISA）测定这些患者术前血清Leptin、VEGF。结果：正常对照组与良性病变组、乳腺癌组Leptin存在明显差异，正常对照组与乳腺癌组，良性病变组与乳腺癌组VEGF存在明显差异。乳腺癌患者术前血清Leptin、VEGF含量与有无淋巴结转移具有相关性。结论：乳腺癌患者术前血清Leptin、VEGF可作为鉴别乳腺良恶性肿瘤有无转移的指标。     

Vascular Endothelial Growth Factor Is Increased in Patients With Preeclampsia

PROBLEM: This study was conducted to determine whether altered levels of vascular endothelial growth factor (VEGF) may play a role in the pathogenesis of preeclampsia. METHOD OF STUDY: Maternal plasma samples were collected from 19 patients with preeclampsia (group A) either before the onset of labor, or before induction of labor or medical intervention. Plasma samples were also obtained from 19 normotensive patients with uncomplicated pregnancies (group B), who were matched with the patients with preeclampsia for gestational age and parity. Samples were frozen at ?70°C until assayed for VEGF by a specific enzyme-linked immunoassay. RESULTS: The mean maternal age was similar in groups A and B. For both groups the VEGF was detectable in all plasma samples. However, the plasma concentrations of VEGF were significantly increased in the group A patients, compared with those in group B (median, 47ng/ml; range, 10.6–72 ng/ml versus median, 13.6 ng/ml; range, 0.66-20 ng/ml; P < 0.001). In group A, a positive correlation was noted between VEGF concentrations and the systolic and diastolic blood pressure (r = 0.56; P = 0.01 and r = 0.48; P = 0.037, respectively). CONCLUSIONS: Maternal plasma VEGF levels were elevated in the patients with preeclampsia and correlated with the severity of hypertension, suggesting a role for VEGF in the pathogenesis of preeclampsia.     

Resveratrol Inhibits Hypoxia-Induced Vascular Endothelial Growth Factor Expression and Pathological Neovascularization

Purpose

To investigate the effects of resveratrol on the expression of hypoxia-inducible factor 1α (HIF-1α) and vascular endothelial growth factor (VEGF) in human adult retinal pigment epithelial (ARPE-19) cells, and on experimental choroidal neovascularization (CNV) in mice.

Materials and Methods

ARPE-19 cells were treated with different concentrations of resveratrol and then incubated under hypoxic conditions with subsequent evaluation of cell viability, expression of HIF-1α, and expression of VEGF. The effects of resveratrol on the synthesis and degradation of hypoxia-induced HIF-1α were evaluated using inhibitors of the PI3K/Akt/mTOR and the ubiquitin proteasome pathways. In animal studies, CNV lesions were induced in C57BL/6 mice by laser photocoagulation. After 7 days of oral administration of resveratrol or vehicle, which began one day after CNV induction, image analysis was used to measure CNV areas on choroidal flat mounts stained with isolectin IB4.

Results

In ARPE-19 cells, resveratrol significantly inhibited HIF-1α and VEGF in a dose-dependent manner, by blocking the PI3K/Akt/mTOR signaling pathway and by promoting proteasomal HIF-1α degradation. In mice experiments, orally administered resveratrol significantly inhibited CNV growth in a dose-dependent manner.

Conclusion

Resveratrol may have therapeutic value in the management of diseases involving pathological neovascularization.     

VEGF在翼状胬肉发病与复发中的作用

目的：探讨血管内皮生长因子（VEGF）在翼状胬肉发病与复发中的作用。方法：采用免疫组织化学方法检测42例初发与30例复发翼状胬肉标本中VEGF的表达情况,并与30例正常对照组比较。结果：VEGF表达阳性率：对照组为6.7%（2/30）,初发组为61.9%（26/42）,复发组为93.3%（28/30）,对照组低于初发组（P〈0.01）,初发组低于复发组（P〈0.05）。VEGF表达强阳性率：对照组为0%（0/30）,初发组为26.2%（11/42）,复发组为63.3%（19/30）,对照组低于初发组（P〈0.01）,初发组低于复发组（P〈0.01）。结论：VEGF的高水平表达是翼状胬肉发病与复发的重要原因。     

可溶性血管内皮生长因子受体1真核克隆表达及其对血管内皮细胞增殖的影响

本研究旨在构建可溶性血管内皮生长因子(vascular endothelial growth factor,VEGF)受体1(soluble fmslike tyosine kinase-1,sFlt-1)的真核表达质粒pcDNA3.1-sFlt-1,并观察sFlt-1对血管内皮细胞增殖的影响。提取人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVECs)总RNA,扩增Flt-1基因胞外1-3结构域,构建真核表达质粒pcDNA3.1-sFlt-1,测序鉴定基因序列。将重组质粒转染Lewis肺癌细胞,采用RT-PCR和SDS-PAGE检测sFlt-1在基因及蛋白水平的表达情况。MTT法检测sFlt-1对VEGF诱导的HUVECs生长的影响。结果显示:①插入片段序列正确;②sFlt-1在基因水平成功表达且转染后的Lewis肺癌细胞能分泌表达sFlt-1;③含sFlt-1的细胞上清液可明显抑制VEGF诱导的HUVECs增殖。本研究成功构建了真核表达质粒pcDNA3.1-sFlt-1,sFlt-1,在基因和蛋白水平均获得有效表达,且表达的蛋白可明显抑制由VEGF诱导...     

Aortic Smooth Muscle Cells Express and Secrete Vascular Endothelial Growth Factor

Abstract

We examined whether cultured bovine aortic smooth muscle (ASM) cells express VEGF. RNA blot analysis of total cellular RNA derived from ASM cells demonstrates the expression of the VEGF gene. ASM cells release in the medium a VEGF-like endothelial cell mitogen which binds to heparin-sepharose and has an apparent molecular weight of 40-45 kDa as assessed by an HPLC gel filtration column. Consistent with VEGF, this mitogen does not stimulate the proliferation of ASM cells. Immunoblot analysis of the bioactive material with an antibody specific for VEGF demonstrates the presence of a major immunoreactive band with an apparent molecular mass of 23 kDa and a minor band with a molecular mass of -18 kDa, in reducing conditions. The major band has very similar apparent molecular weight as the 165 amino-acid species of human recombinant VEGF of folliculo-stellate cells derived VEGF. These data demonstrate the expression and synthesis of VEGF by cultured ASM cells and suggest that the 164 amino-acid species is the predominant molecular form of the growth factor secreted by such cells. VEGF released by ASM cells may play a paracrine role in the maintenance of the integrity of the endothelial lining or in the abnormal proliferation of the vasa vasorum which takes place in atherosclerosis.     

Expression of Vascular Endothelial Growth Factor during Neoangiogenesis Stimulated by Exposure to High-Intensity Laser Radiation

Expression of vascular endothelial growth factor was studied during neoangiogenesis stimulated by exposure of ischemic tissues in the limb muscles, liver, and myocardium and normal myocardial tissue to high-intensity laser radiation. Changes in expression were related to cell reactions during the inflammatory and reparative process and did not differ in the studied tissues.     

转化生长因子β1及血管内皮细胞因子在颈椎病椎体软骨终板中的表达变化

目的：研究TGF-β1、VEGF在终板软骨细胞中的表达，探讨椎间盘退变的发病机理。方法：应用免疫组化SP染色法检测TGF-β1、VEGF在15例颈椎病及13例正常椎体软骨终板中的表达，并对其阳性表达结果进行比较。结果：TGF-β1在正常终板软骨细胞表达的阳性细胞数为39．0％±1．96％，与颈椎病终板软骨细胞表达的阳性细胞数28．2％±2．18％相比，差异有统计学意义（P〈0．05）。VEGF在正常的终板软骨细胞表达的阳性细胞数为22．2％±2．13％，与颈椎病终板软骨细胞表达阳性细胞数14．3％±1．68％相比，差异有统计学意义（P〈0．05）。结论：TGF-β1和VEGF共同参与了椎间盘退变的形成和发展，在椎间盘退变的发病中可能起重要的作用。调节细胞因子（TGF-β1、VEGF）在终板软骨细胞中的表达，可能为椎间盘退变的治疗提供一种新的途径。