2型糖尿病肾病患者肾组织中血管内皮细胞生长因子及其受体的变化

目的了解血管内皮细胞生长因子(VEGF)及其受体(VEGF-R)在2型糖尿病肾病患者肾组织中的变化及其与糖尿病肾病(DN)临床与病理表现之间的关系.方法以正常肾组织为对照,采用特异性抗体和免疫组织化学染色方法,对30例DN患者肾组织中VEGF和VEGF-R的分布及其强度变化进行了观察,并结合临床及肾脏病理进行了分析.结果DN患者肾小球VEGF和VEGF-R无论在分布上,还是在强度变化上与正常人相比均有明显差异.DN患者肾小球VEGF和VEGF-R表达增加与患者蛋白尿(83.3%vs33.3%,P＜0.01)、糖尿病视网膜病变(66.7%vs16.7%,P＜0.01)关系密切,而与高血压,糖化血红蛋白水平之间无明显相关性.DN患者肾小球VEGF和VEGF-R表达增加还与肾小球内皮细胞损伤所致的一些组织形态学改变,如K-W结节(72.2%vs16.7%,P＜0.05)、肾小球内皮细胞增生(66.7%vs33.3%,P＜0.05)及微血管瘤形成(61.6%vs25.0%,P＜0.05)的发生显著相关.结论DN患者肾组织中VEGF及VEGF-R2的表达增加与DN患者的蛋白尿形成、糖尿病视网膜病变和内皮细胞损伤所致的形态学改变关系密切.VEGF介导了DN患者肾小球内皮细胞损伤和功能紊乱的发生.     

血管内皮细胞生长因子在大鼠心脏移植急性排斥期的表达研究

目的:观察血管内皮细胞生长因子(VEGF)在大鼠心脏移植急性排斥期中的表达及与排斥反应的关系。方法:实验分为对照组和环孢霉素A(CSA)组,每组27只。采用颈部心脏异位移植术式建立移植模型,于心脏移植手术后分别静脉给予0.85%氯化钠溶液及CSA干预。常规监测排斥反应发生情况。每组7只用于观察移植物存活时间,余20只移植术后1,3,7,11d各切取5例移植心标本。样本采用逆转录聚合酶链反应(RTPCR)的方法检测移植心VEGF的DNA表达水平。结果:CSA组移植心存活时间[(21.1±2.9)d]长于对照组[(12.4±2.3)d],P<0.01;对照组各采样时段VEGF的DNA表达强度均强于CSA组,P<0.01。结论:VEGF高表达与移植心的炎性浸润以及急性排斥有密切关系。     

糖尿病大鼠缺血再灌注脑组织胰岛素受体表达与血管内皮生长因子的相关性

采用免疫组织化学技术检测糖尿病大鼠缺血脑组织胰岛素受体和血管内皮生长因子(VEGF)的表达特点.与单纯脑缺血组相比,糖尿病脑缺血组胰岛素受体和VEGF表达均明显降低(P＜0.05或P＜0.01);各组胰岛素受体与VEGF表达呈显著正相关(P＜0.05或P＜0.01).     

大肠癌组织血管内皮生长因子及其受体的表达与肿瘤血管生成的关系

目的探讨血管内皮生长因子(VEGF)及其受体(KDR)的表达与人大肠癌组织血管生成的关系.方法采用免疫组织化学SABC法观察了68例人大肠癌组织中的VEGF及KDR的定位与分布,并对血管进行染色及计数.结果68例大肠癌组织中VEGF表达阳性率为55.9%(38/68),阳性物质主要位于肿瘤细胞膜及胞浆KDR表达阳性率为45.6%(31/68),既可位于癌组织及癌组织旁的血管内皮细胞,又可位于肿瘤细胞胞膜及胞浆.VEGF表达与大肠Dukes分期密切相关.VEGF表达阳性大肠癌组织的微血管密度(MVD)(31.2±12.6)显著高于VEGF表达阴性(12.7±6.3)(P＜0.01),而且随着VEGF表达强度的增强,癌组织内微血管密度明显增加(P＜0.01).结论大肠癌细胞分泌的VEGF既可以旁分泌的形式促进肿瘤血管的生成,也可能存在着自分泌形式,VEGF与大肠癌的生长、浸泣和转移密切相关,是大肠癌主要的血管新生诱导因子之一,可促进大肠癌的血管生成.     

血管内皮生长因子及其受体随增龄在大鼠肾组织内表达的研究

目的　研究血管内皮细胞生长因子 (VEGF)及其受体Flt 1和Flk 1在大鼠肾组织内的表达及随增龄变化 ,探讨它们在肾脏衰老过程中的作用。　方法　应用 3、12、2 4月龄 (各 7只 )大鼠肾组织石蜡切片进行常规病理及免疫组织化学染色 ,定量分析肾组织内微血管变化及VEGF、Flt 1和Flk 1表达变化。应用逆转录聚合酶链反应技术 (RT PCR)检测肾组织内VEGF AmRNA的表达。　结果　 2 4月龄组与 3月龄组相比肾小球面积增大〔(15 6 35± 10 2 2 ) μm2 vs(72 0 5± 496 ) μm2 ,P <0 0 1〕 ,肾小球内毛细血管袢腔面积与肾小球面积百分比减少 (46 76 %± 4 91%vs 6 3 75 %±6 0 2 % ,P <0 0 1) ,肾小管周围毛细血管数量减少 (9 8± 2 6vs 14 7± 3 1,P <0 0 1) ;肾小球内VEGF阳性细胞数增多 (9 3± 2 4vs 6 4± 1 6 ,P <0 0 5 ) ;集合管中VEGF的表达则明显减少(9 35 %± 2 10 %vs 15 2 3%± 3 2 2 % ,P <0 0 5 ) ;Flk 1在肾小球血管袢上表达增加 (9 17%±2 0 2 %vs 1 0 3%± 0 35 % ,P <0 0 1) ,而Flt 1和Flk 1在肾小管上表达则明显减少 (7 6 4%±3 0 2 %vs 15 36 %± 2 5 4% ,2 48%± 0 86 %vs 9 0 1%± 2 6 3% ,P <0 0 1)。 2 4月龄组VEGF AmRNA较其他两组减少 (P <0 0 5 )。　结论　VEGF、Flk     

血管内皮生长因子及其受体的生物学特点

<正>血管内皮生长因子(vascular endothelial growth factor,VEGF)是胚胎形成、骨骼生长和生殖功能过程中血管生成的重要调节因子,与肿瘤、眼内新生血管性等疾病有关[1]。VEGF的生物学活性受2种酪氨酸激酶受体(tyrosine kinases)的调节:VEGFR-1和VEGF-2,这2种受体的信号学活性差异非常大。目前,多种VEGF抑制因子在进行恶性肿瘤临床实验,人们试图通过抑制VEGF降低血管生成、血管渗漏等。VEGF和VEGFR     

血管内皮生长因子及其受体在肺气肿患者肺组织中的表达

目的探讨血管内皮生长因子(VEGF)及其受体2(VEGF受体2/KDR)在肺气肿患者肺组织中的表达及其与肺气肿的相关性。方法取35例行肺叶切除术患者[A组(吸烟伴肺气肿组)16例,B组(不吸烟肺功能正常组)14例,C组(吸烟但肺功能正常组)5例]的外周肺组织标本,ELISA法检测肺组织匀浆中VEGF的含量,免疫组化法检测KDR蛋白表达,RT PCR检测VEGF和KDRmRNA水平,TUNEL法检测肺泡隔细胞的凋亡。结果A组患者肺组织VEGF、KDR表达均低于B组(P<0.01),肺泡隔细胞凋亡率高于B组(P<0.01)。C组与B组相比,VEGF及KDR表达差异无统计学意义(P>0.05)。结论VEGF及KDR水平减少与肺泡隔细胞凋亡的增加可能与肺气肿的发生相关。     

The expression of vascular endothelial growth factor and the type 1 vascular endothelial growth factor receptor correlate with the size of papillary thyroid carcinoma in children and young adults.

Vascular endothelial growth factor (VEGF) is essential for the growth of many solid tumors, but there are little data regarding VEGH in childhood thyroid cancers. We examined the relationships between VEGF, the type 1 VEGF receptor (FLT-1) and clinical outcome for a group of thyroid cancers in children and young adults. The expression of VEGF and FLT-1 were determined by immunohistochemistry using archival, paraffin-embedded thyroid tissue blocks and compared with the retrospective clinical outcome for each patient. The study included 67 children and young adults with papillary thyroid carcinoma (PTC, n = 42), follicular thyroid carcinoma (FTC, n = 8), benign lesions (n = 15), or controls (n = 2). VEGF expression was greater in PTC (mean intensity 2.23 +/- 0.25, p = 0.002) and FTC (2.8 +/- 0.73, p = 0.01) than benign lesions (1.0 +/- 0.27), and correlated with PTC size (r = 0.42, p = 0.008). FLT-1 expression was greater in PTC (mean intensity 2.8 +/- 0.17) than FTC (1.9 +/- 0.25, p = 0.015) and benign lesions (1.7 +/- 0.32, p = 0.002); and correlated with PTC size (r = 0.41, p = 0.01) as well as VEGF expression (r = 0.52, p = 0.002). Recurrent disease developed exclusively in patients with PTC which expressed VEGF (7/28, 95% CI 10.6%-44.2%). PTC that did not express VEGF (0/8, 95% CI = 0%-31.2%) did not recur; however, the difference was not statistically significant (p = 0.15). We conclude that the expression of VEGF and FLT-1 are directly correlated with the size of PTC in children and young adults.     

替米沙坦降低血糖正常的胰岛素抵抗大鼠肾脏血管内皮生长因子及其受体的表达

RT-PCR和免疫组化结果显示,血糖正常阶段胰岛素抵抗大鼠肾脏皮质血管内皮生长因子(VEGF)及其受体(flk-1)表达显著升高,替米沙坦可明显降低其表达,提示替米沙坦可通过下降VEGF、flk-1的表达减轻肾脏损害.     

血清血管内皮生长因子及可溶性血管内皮生长因子受体1在系统性红斑狼疮患者中的表达及其意义

目的 研究血清中血管内皮生长因子(VEGF)及可溶性血管内皮生长因子受体1(sFlt-1)在活动期系统性红斑狼疮(SLE)及不同肾脏病理类型的狼疮肾炎(LN)患者中表达的意义. 方法 采用双抗体夹心酶联免疫吸附法(ELISA)对60例SLE患者及30名健康人血清中VEGF及sFlt-1的水平同时进行检测,结合临床资料及肾脏病理进行相关分析. 结果 活动期SLE患者血清VEGF及sFlt-1水平均明显升高;血清中VEGF/sFlt-1的比值健康对照组较活动期SLE、非活动期SLE及LN组患者降低(P＜0.01),Ⅴ型LN组该比值较Ⅱ、Ⅲ、Ⅳ型LN组升高(P＜0.05);血清sFlt-1的浓度与尿蛋白呈正相关(rs=0.6244,P＜0.01),血清VEGF的浓度与尿蛋白无明显相关(rs=0.1807,P＞0.05);血清sFlt-1的浓度与ESR正相关(rs=0.4235,P＜0.01),血清VEGF的浓度与ESR无明显相关(rs=0.0532,P＞0.05);血清VEGF及sFlt-1浓度与SLE疾病活动指数(SLEDAI)均呈正相关(rs=0.5046,P＜0.01,rs=0.5152,P＜0.01);血清VEGF浓度与肾组织活动指数(RAI)呈正相父(r=0.3386,P＜0.05),血清sFlt-1浓度与RAI无明显相关(rs=0.0240,P＞0.05);SLE患者中VEGF、sFlt-1水平与血压、血肌酐、尿素氮、C3、C4、C反应蛋白(CRP)无明显相关. 结论 血清VEGF及sFlt-1的水平可作为SLE病情活动评价指标,VEGF的高表达可能与增殖性肾小球病变相关,sFlt-1的表达与蛋白尿关系密切.     

布地奈德/福莫特罗对支气管哮喘患者血管内皮生长因子及其受体1表达及气道重塑的调控作用

目的支气管哮喘(简称哮喘)是一种慢性气道炎症疾病,伴随气道高反应性、可逆性气流阻塞和气道重塑。血管生成和微血管重塑在气道慢性炎症过程中可能起到重要的作用。血管内皮生长因子(vascular endothelial growth factor,VEGF)是一种促血管生成因子,其生理作用包括促进内皮细胞存活、增殖和迁移。本研究通过检测哮喘患者气道VEGF和VEGF受体1(VEGFR1)的表达,探讨VEGF和哮喘患者气道重塑的关系以及布地奈德/福莫特罗对哮喘患者气道重塑的调控作用。方法支气管组织来源于2006年4月至11月四川大学华西医院经纤维支气管镜行组织活检。23例为中度哮喘患者,20例为对照组。哮喘患者给予规律吸入布地奈德/福莫特罗4.5/160μg,2次/d,持续半年。VEGF和VEGFR1通过免疫组织化学进行检测。AB-PAS和MassonTrichrome染色用于评估气道重塑程度。结果两组之间年龄和性别差异无统计学意义。而两组之间用力肺活量占预计值%,第一秒用力呼气容积占预计值%,PC20,V75占预计值%,V50占预计值%和V25占预计值%的差异有统计学意义。哮喘组患者气道黏液腺增生、平滑肌增厚、上皮下纤维化以及新生血管增加。与对照组比较,VEGF和VEGFR1阳染细胞数目增多,表达增加。VEGF和VEGFR1表达增加与哮喘患者的气道重塑、气流阻塞和气道高反应性呈正相关。规律吸入布地奈德/福莫特罗6个月后,哮喘患者VEGF和VEGFR1表达减少,气道重塑减轻。结论伴随哮喘患者气道血管生成增多和气道重塑,VEGF和VEGFR1表达增加。规律吸入布地奈德/福莫特罗可以通过减少VEGF和VEGFR1表达而减轻哮喘患者气道重塑。阻断VEGF和VEGFR1可能是治疗哮喘的新策略。     

Tie2 vascular endothelial receptor expression and function in hepatocellular carcinoma

Hepatocellular carcinoma (HCC) is generally characterized as a hypervascular tumor of rapid growth. We have previously reported that angiopoietin (Ang), a ligand for Tie2 vascular endothelial-specific receptor tyrosine kinase, may play a role in the progression of human HCC (J Clin Invest 1999;103:341-345) and matrix proteinase expression (Cancer Res 2001;61:2145-2153). However, the role of Tie2 receptor in hepatic oncogenesis is unknown. The Tie2 receptor protein was overexpressed in the neovascular endothelium of 31 of 39 (80%) human HCC tumors by immunohistochemical analysis with significant correlation to cell dedifferentiation and tumor size (P <.05). In vitro expression of a dominant-negative construct, containing a soluble Tie2 ectodomain (sTie2), led to Ang protein interaction, inhibition of endogenous Tie2 phosphorylation in vascular endothelial cells and matrix metalloproteinase 9 (MMP-9) suppression. In conclusion, tumorigenicity with neovascularization was suppressed by in vivo gene transfer and sTie2 expression in a murine HCC model, suggesting a possible role for Tie2 expression in the induction of HCC neovascularization and disease progression. Inhibition of the Ang/Tie2 signal transduction cascade is a promising approach for tumor treatment.     

山茱萸环烯醚萜苷对局灶性脑缺血大鼠血管内皮生长因子及其受体表达的影响

目的研究山茱萸环烯醚萜苷（CIG）对局灶性脑缺血大鼠神经功能和血管内皮细胞生长因子（VEGF）及其受体FLK-1表达的影响。方法取成年雄性SD大鼠115只,随机分为假手术组、模型组及CIG治疗组。治疗组又分为20、60和180mg／kg剂量组,每组23只大鼠。采用大脑中动脉线栓法制作大鼠局灶性脑缺血模型,造模后3h开始灌胃给药。造模后7、14和28d,采用改良神经功能缺损评分（mNSS）评价大鼠的神经功能,用免疫组化法和Western Blot法检测VEGF蛋白表达。用RT—PCR方法检测VEGF及其受体FLK-1的mRNA表达。结果①造模后7、14和28d,与模型组相比,CIG 60和180mg／kg组大鼠mNSS均显著降低（F=2．832,F=4．970,F=2．661,均P〈0．05）;②造模后7d,模型组大鼠大脑皮质VEGF蛋白与假手术组相比无明显变化,14和28d时,VEGF蛋白表达降低;与模型组相比,7、14和28d时,CIG 60和180mg／kg组VEGF蛋白表达显著增加（F=1．202,F=1．705,F=2．189,均P〈0．05）;③造模后28d,CIG 60和180mg／kg组大鼠VEGF阳性细胞染色面积显著增加（F=13．249,均P〈0．05）;④造模后7d,与模型组相比,CIG 60和180mg／kg组大鼠大脑皮质VEGF-mRNA表达亦显著增加（F=2．389,均P〈0．05）;CIG 60和180mg／kg组FLK-1 mRNA的表达也显著增加（F=3．657,均P〈0．05）。结论CIG能明显改善局灶性脑缺血大鼠的神经功能,其机制可能与CIG促进VEGF蛋白的表达有关。     

VEGF在大鼠慢性酒精性肝损伤中的表达

目的:观察大鼠慢性酒精性肝损伤过程中 VEGF的表达,探讨其在慢性酒精性肝损伤发生、发展中的作用．方法:56度的白酒(560 mL／L)平均以7 g／kg的剂量每日早晨灌胃一次制备肝纤维化模型,灌胃4 wk、12 wk及24 wk采用股静脉放血法分别处死大鼠,观察肝脏病理变化并采用半定量逆转录聚合酶链反应(RT-PCR)检测VEGF mRNA的表达．结果:对照组的VEGF未见表达,饲酒4 wk组表达VEGF mRNA比例最高,达到83．3％(5／6), 与对照组相比有非常显著性差异(P<0．01), 12 wk时下降到18．2％(2／11),且其表达与对照组相比无差异(P>0．05),而至24 wk VEGF表达阳性率上升到57．1％(4／7),与对照组相比有非常显著性差异(P<0．01)．另外,饲酒4 wk组 VEGF表达阳性率与12周相比差异也有非常显著性(P<0．01),而与24 wk相比无统计学差异．试验组大鼠肝细胞出现明显脂肪、空泡变性,坏死及胶原增生等病变．结论:VEGF可能在酒精性肝病中起重要作用,主要与酒精性肝炎及酒精性肝纤维化有关．     

老年大鼠心肌缺血后VEGF及其亚型的表达

目的探讨老年急性心肌缺血后VEGF各亚型表达特点,为老年心血管疾病的促血管生成治疗奠定基础。方法复制老龄大鼠心肌梗死模型,采用RT-PCR技术同管扩增VEGF和内参基因,比较VEGF各亚型与内参基因的比值,VEGF120、164、188的和为总VEGF。结果老年大鼠心脏总VEGFmRNA在缺血各阶段明显少于年青大鼠(P<0.01),而且达到峰值的时间推迟,老年大鼠第6小时总VEGFmRNA与GAPDH的比值(2.86±0.19)明显低于年青大鼠第3小时的比值(6.09±0.30)(P<0.001)。缺血后各时间点年青和老年大鼠的VEGF164所占比例最高,VEGF120最低。老年大鼠VEGF188的表达比例增加。结论老年大鼠心肌缺血后VEGF表达减少,而且没有血管生成活性的VEGF188所占比例增加,可能导致老年缺血心肌血管生成能力下降。     

Differential expression of vascular endothelial growth factor isoforms and receptor subtypes in the infarcted heart

Aims

The vascular endothelial growth factor (VEGF) family contains four major isoforms and three receptor subtypes. The expressions of each VEGF isoform and receptor subtype in cardiac repair/remodeling after myocardial infarction (MI) remain uncertain and are investigated in the current study.

Methods and results

Temporal and spatial expressions of VEGF isoforms and VEGFR subtypes were examined in the infarcted rat heart. Sham-operated rats served as controls. We found that the normal myocardium expressed all VEGF isoforms. Following MI, VEGF-A was only increased in the border zone at day 1 and was significantly decreased in the infarcted heart during the 42 day observation period afterwards. VEGF-B was significantly suppressed in the infarcted heart. VEGF-C and VEGF-D were markedly increased in the infarcted heart in both early and late stages of MI. VEGFR-1 and 2 were significantly decreased in the infarcted heart, while VEGFR-3 was significantly increased, which was primarily expressed in blood vessels and myofibroblasts (myoFb).

Conclusions

VEGF isoforms and VEGFR subtypes are differentially expressed in the infarcted heart. Increased VEGF-A in the very early stage of MI suggests the potential role in initiating the cardiac angiogenic response. Suppressed cardiac VEGF-B postMI suggests that it may not be critical to cardiac repair. The presence of enhanced VEGF‐C and VEGF-D along with its receptor, VEGFR-3, in various cell types of the infarcted heart suggest that these isoforms may regulate multiple responses during cardiac repair/remodeling.     

Prognostic significance of cellular vascular endothelial growth factor expression in chronic phase chronic myeloid leukemia

The impact of elevated vascular endothelial growth factor (VEGF) expression on the course of chronic myeloid leukemia (CML) is unknown. By radioimmunoassay, we measured pretreatment cellular VEGF protein in bone marrow samples from 184 (148 chronic and 36 accelerated/blastic phases) CML patients and found the levels to be 1.6-fold higher than in 31 normal control bone marrow samples (P =.000 01). No significant differences were found in VEGF levels by different phases of CML (P =.1). VEGF levels correlated with older age (P =.01) and higher platelet count (P =.0003), but also with smaller spleen size (P =.004), lower white blood cell count (P =.0006), and lower percentage of peripheral blasts (P =.04). With the use of Cox proportional hazard model and VEGF levels as a continuous variable, high VEGF levels correlated with shorter survival of patients in chronic CML (P =.008). Multivariate analysis showed that VEGF was not independent of the synthesis stage (P =.09). These data suggest that VEGF plays a role in the biology of CML and that VEGF inhibitors should be investigated in CML.     

Inhibitory effect of arsenic trioxide on angiogenesis and expression of vascular endothelial growth factor in gastric cancer

INTRODUCTION Arsenic has been used since ancient times as a therapeutic agent. However, until recently its use in modern medicine has been restricted to the treatment of a limited number of parastic infections. Since the early 1990s, arsenic trioxide (As2…