抗人膀胱癌/抗血管内皮生长因子双功能基因抗体对膀胱癌的生长抑制作用

目的　对抗人膀胱癌 /抗血管内皮生长因子 (VEGF)双功能基因抗体进行免疫定位研究并观察其对人膀胱癌生长的抑制作用。　方法　采用免疫组化和免疫电镜前染色法对 6 0例膀胱癌患者的手术切除标本进行免疫定位研究 ;构建人膀胱癌裸鼠皮下移植瘤模型并注射双功能抗体 ,观察肿瘤生长情况 ,同时检测肿瘤微血管密度 (MVD)值及肿瘤细胞凋亡指数 (AI)。　结果　 6 0例膀胱癌标本 ,抗原检测阳性 5 3例 ( 88.3% ) ;对照组 2 0例 ,抗原检测阳性 1例 ( 5 .0 % )。治疗后第 2周 ,实验组小鼠皮下种植肿瘤大小 ( 2 1.4 7± 6 .5 7)mm2 ,对照组 ( 5 9.85± 15 .4 3)mm2 ;实验组MVD 2 14 8± 10 9,对照组为 4 0 5 6± 36 7;实验组肿瘤细胞AI为 17.2 6 ,对照组为 7.0 9。组间比较 ,差异均有显著性意义。　结论　抗人膀胱癌 /抗VEGF双功能基因抗体对人膀胱癌有较好的靶向性 ,能够通过抑制肿瘤微血管形成和加速肿瘤细胞凋亡而抑制实验性人膀胱癌的生长     

抗血管内皮生长因子抗体对实验性肝癌的生长抑制作用

目的了解抗血管内皮生长因子(VEGF)抗体对人肝癌的生长抑制作用.方法在已建立的人肝癌裸鼠皮下种植瘤的瘤灶旁,注射抗VEGF抗体,观察肿瘤生长情况,用CD31的免疫组化方法检测肿瘤内部的微血管密度(iMVD),用原位末端转移酶标记技术检测凋亡的肿瘤细胞.结果实验结束后1周,实验组和对照组肿瘤大小(长×宽)是(26.46±19.81) mm2和(105.77±17.40) mm2(P<0.001),2周后是(45.20±23.02) mm2和(150.77±77.41) mm2(P<0.05),而此时肿瘤的iMVD是(2 311±120)个/mm2和(3 900±328)个/mm2 (P<0.001); 肿瘤细胞凋亡指数是15.31% 和 6.83%(P<0.005).结论抗VEGF抗体能通过抑制肿瘤微血管的生长,抑制实验性人肝癌的生长,其实质是增加了肿瘤细胞凋亡.     

血管内皮生长因子抗体治疗骨肉瘤的实验研究

目的　探讨血管内皮生长因子 (VEGF)抗体对骨肉瘤OS 732细胞株血管形成及瘤细胞生长状态的影响 ,为从抗血管生成途径治疗骨肉瘤提供依据。　方法　应用鸡胚绒毛尿囊膜模型 ,通过解剖显微镜下血管计数、原位铺片、组织切片HE染色及PCNA免疫组化和原位末端标记技术检测VEGF抗体对肿瘤血管形成、肿瘤生长的抑制作用及其对细胞增殖和凋亡的影响。　结果　VEGF抗体组血管密度 [给予抗体第 8天时为 (30 6± 4 6 ) ]明显低于对照组 [给予抗体第 8天时为 (5 1 0±6 9) ],瘤细胞较对照组减少 ,肿瘤细胞凋亡指数 (16 98± 4 81)显著高于PBS对照组 (3 75± 0 73) ,增殖指数两组差异不明显 ,同时VEGF抗体组凋亡的微血管内皮细胞增多 ,增殖期微血管内皮细胞少见。　结论　VEGF抗体能够显著抑制骨肉瘤OS 732血管形成 ,抑制内皮细胞增殖 ,促进内皮细胞凋亡 ,可能是VEGF抗体发挥抗血管生成作用的途径之一 ,并通过抑制血管形成而促进肿瘤细胞凋亡 ,最终达到抑制瘤细胞生长的作用。     

血管内皮生长因子反义核糖核酸对人肺癌的抗血管生成作用

目的探讨血管内皮生长因子(VEGF)反义RNA封闭内源性VEGF表达对人肺癌裸鼠皮下移植瘤血管生成的影响。方法采用30只裸鼠建立人肺癌皮下移植瘤模型,通过原位分子杂交法测定VEGFmRNA、免疫组织化学法测定VEGF表达和微血管密度计数,比较治疗组和空载组、对照组间的差异,研究以脂质体介导VEGF反义cDNA经局部多点注射封闭内源性VEGF表达的抗血管生成作用。结果治疗组肿瘤组织的VEGFmRNA阳性细胞数为(21.83±13.47)个/0.05mm2、VEGF蛋白阳性细胞数(20.76±15.69)个/0.05mm2、微血管密度计数(MVD)为(2.30±1.95)条/0.20mm2,与对照组、空载组的差异均有统计学意义(P<0.01),VEGF反义RNA治疗能够有效的封闭内源性VEGF的生成、使肿瘤组织微血管生成减少,实验结束时瘤体大小与对照组和空载组的差异均有统计学意义(P<0.001)。结论VEGF反义RNA治疗是一种有效的肿瘤抗血管生成基因治疗方法。     

血管内皮生长因子反义核酸对胰腺癌细胞增殖、凋亡和血管生成的影响

目的探讨腺病毒介导的血管内皮生长因子(VEGF)反义核酸对胰腺癌细胞增殖、凋亡和血管生成的作用。方法构建反向插入VEGF165基因的复制缺陷型腺病毒载体(Ad-αVEGF)。18只裸鼠皮下接种人胰腺癌细胞株SW1990,随机分成3组(n=3),1周后瘤体内分别注射磷酸盐缓冲液(PBS,100μl,PBS对照组)、报告基因LacZ重组腺病毒(100μl,Ad-LacZ对照组)、反义VEGF重组腺病毒(100μl,Ad-αVEGF治疗组),隔日1次,共4次。1个月后处死动物。PCNA染色、TUNEL法和CD31染色观察反义VEGF165基因转染对胰腺癌细胞增殖、凋亡和血管生成的影响。结果Ad-αVEGF治疗组PCNA阳性表达率为(38.1±6.8)%,较LacZ组(89.6±4.3)%、PBS对照组(92.1±5.2)%明显降低(P<0.01),LacZ组与PBS对照组之间差异无统计学意义(P>0.05)。Ad-αVEGF治疗组细胞凋亡率(32.3±3.8)%,明显多于LacZ组(8.6±7.6)%和PBS对照组(9.9±4.2)%(P<0.01),LacZ组与PBS对照组之间差异无统计学意义(P>0.05)。Ad-αVEGF治疗组肿瘤微血管密度(12±3),明显少于LacZ组(26±5)和PBS对照组(25±4)(P<0.01),LacZ组与PBS对照组之间差异无统计学意义(P>0.05)。结论反义VEGF165基因转染可以抑制肿瘤细胞增殖,增加细胞凋亡,减少了肿瘤内微血管数量,从而抑制肿瘤生长。     

乙酰肝素酶在膀胱癌中的表达及其与肿瘤血管形成的关系

目的探讨乙酰肝素酶(HPSE)mRNA在膀胱癌中的表达及其与肿瘤临床病理特征和血管生成的关系。方法应用逆转录聚合酶链反应(RTPCR)检测42例膀胱癌及16例癌旁组织中HPSEmRNA的表达,应用免疫组织化学法检测膀胱癌组织的微血管密度(MVD),结合患者临床病理指标及预后进行分析。结果42例膀胱癌中,HPSEmRNA阳性23例(54.8%),16例癌旁组织中表达阳性者2例(12.5%),两组差异有统计学意义(P<0.01);HPSEmRNA的表达与膀胱癌的病理分级、临床分期、肿瘤大小及淋巴结转移有相关性(P<0.05);术后生存3年以下者HPSEmRNA的表达阳性率87.5%,明显高于生存3年以上者之46.9%(P<0.05);HPSEmRNA表达阳性者MVD值为90.8±13.6,表达阴性者肿瘤MVD计数均值为65.8±6.6,两组差异有统计学意义(P<0.01)。结论HPSE在膀胱癌的生长浸润、侵袭转移和血管生成中发挥重要作用,可作为判断膀胱癌生物学行为和预后的客观指标。     

抗血管内皮生长因子抗血清对小鼠膀胱癌的影响

目的　观察抗血管内皮生长因子 (VEGF)抗血清对小鼠膀胱肿瘤血管生成和肿瘤生长的影响 ,探讨膀胱肿瘤治疗的新途径。　方法　采用重组VEGF蛋白制备抗VEGF抗血清 ,ELISA方法检测其特异性 ;建立小鼠膀胱癌模型 ,并将荷瘤小鼠随机分为抗VEGF抗血清组和对照组 ,分别经腹腔注射抗VEGF抗血清和普通小鼠血清 ;检测肿瘤内微血管密度 (MVD) ,并称取肿瘤重量。　结果　实验制备了高度特异性的抗VEGF抗血清 ,荷瘤小鼠用药后抗VEGF抗血清组MVD值 (7.5 1± 2 .88)明显低于对照组 (14 .4 8± 3.92 ) ,抗VEGF抗血清组小鼠平均瘤重较对照组稍轻 ,P =0 .6 0 5 ,差别无显著性意义。　结论　抑制VEGF作用可以减少膀胱肿瘤的血管生成 ,为膀胱肿瘤抗血管生成疗法提供了依据 ,并可能成为膀胱肿瘤重要的辅助治疗手段之一。     

Angiostatin基因治疗人肝癌裸鼠移植瘤的实验研究

目的:研究Angiostatin基因治疗对人肝癌裸鼠皮下移植瘤的抑制作用及其相关机理。方法:使用人原发性肝癌细胞株SMMC-7721建立人肝癌裸鼠皮下移植瘤动物模型,质粒用脂质体DOTAP介导转染细胞。将荷瘤裸鼠随机分为两组,分别注射质粒PcDNA3、Angiostatin/PcDNA3,观察两组动物的肿瘤生长曲线,检测肿瘤的Angiostatin、VEGF、HIF-1α表达和微血管密度(MVD),利用TUNEL染色法行原位细胞凋亡分析。结果:Angiostatin基因治疗在早期具有抑制肿瘤生长的作用,大约1周后肿瘤以更快的速度生长并迅速赶上空质粒对照组肿瘤;Angiostatin基因治疗组的肿瘤组织中有An-giostatin的局部高表达,MVD(24.8±2.8)低于空质粒对照组(30.2±4.1)(P〈0.05)。肿瘤组织中HIF-1α蛋白局部高表达,VEGF表达高于空质粒对照组,细胞凋亡指数(2.87±0.48)高于空质粒对照组(1.55±0.43)(P〈0.01)。结论:Angiostatin基因治疗对人肝癌裸鼠皮下移植瘤的生长具有一定的抑制作用,肿瘤对Angiostatin基因治疗可以产生耐受性。     

端粒酶抑制剂与丝裂霉素C联合应用对膀胱癌的作用

目的:探讨端粒酶抑制剂对荷瘤小鼠肿瘤生长的影响及与化疗药物的协同作用。方法:应用端粒酶抑制剂齐夫多啶(AZT)联合化疗药物丝裂霉素C(MMC)治疗小鼠移植性膀胱癌(T24),观察其对抑瘤率、肿瘤端粒酶的表达及对肿瘤细胞凋亡的影响。结果:AZT、MMC、MMC加AZT的抑瘤率分别为12. 1%、29. 6%和43. 6%,AZT与MMC均能抑制肿瘤生长,并且AZT与MMC联用明显优于两者单独应用(P<0. 05 )。采用TUNEL法检测肿瘤细胞凋亡指数分别为(20. 23±0. 89)%、(8. 04±0. 12)%和(24. 09±1. 81)%。肿瘤端粒酶活性检测显示各组端粒酶阳性率分别为36. 5%、43. 6%和11. 8%,与对照组比较,AZT、MMC均有减少肿瘤端粒酶活性的作用(P<0. 05)。结论:MMC及AZT均能抑制小鼠膀胱癌T24细胞的生长及降低其端粒酶活性,诱导细胞凋亡,二者联用有相加作用。     

缺氧诱导因子-1α小干扰RNA对人膀胱癌小鼠移植瘤生长的实验研究

目的 观察缺氧诱导因子-1α(HIF-1α)siRNA对人膀胱癌小鼠膀胱原位移植瘤生长的抑制作用,探讨HIF-1α作为膀胱癌基因治疗靶点的有效性.方法 把已稳定转染pGC-siHIF-1α的人膀胱癌细胞株T24接种至小鼠膀胱.通过CT观察肿瘤生长,应用免疫组化(SABC)检测肿瘤细胞HIF-1α和肿瘤间质CD34的水平,根据CD34表达情况评价肿瘤微血管密度(MVD).末端脱氧核苷酸转移酶标注法(TUNEL)测定肿瘤细胞凋亡指数;二苯基溴化四氮唑蓝(MTT)法测定肿瘤细胞增值率;流式细胞仪(FCM)测定肿瘤细胞周期分布.结果 实验组与对照组相比较,实验组成瘤率低,肿瘤生长速度缓慢(p＜0.05);HIF-1α水平下降(P＜0.01);肿瘤微血管密度减少(P＜0.01);凋亡指数升高(P＜0.01);增殖能力减弱(P＜0.01);G0/GI期细胞增多,G2/M期和S期细胞均减少(P＜0.05);与对照组相比较,组间差异均具有统计学意义.结论 以HIF-1α为靶点的siRNA有抑制H1F-1α表达,遏制膀胱癌T24细胞在体内生长的作用,HIF-1 0有可能成为临床膀胱癌基因治疗的新的有效靶点.     

bFGF及其抗体对移植前列腺癌生长影响的研究

目的探讨碱性成纤维细胞生长因子（bFGF）及其抗体对裸鼠人前列腺癌移植瘤生长的影响和作用机制。方法建立人前列腺癌细胞系（DU-145）细胞裸鼠皮下移植瘤动物模型,观察移植肿瘤生长及荷瘤裸鼠状况,观察bFGF与bFGF抗体对裸鼠皮下瘤生长状况的影响;应用免疫组织化学方法检测肿瘤组织中增殖细胞核抗原（PCNA）和CD34的表达。结果 1bFGF治疗组移植瘤重量和体积分别比对照组显著增多,移植瘤组织中PCNA指数和微血管密度（MVD）也显著提高;2bFGF抗体治疗组移植瘤体积重量和体积比对照组均显著减少,移植瘤组织中PCNA指数和MVD也显著降低。结论 bFGF能促进前列腺癌细胞的增殖生长,bFGF抗体则能抑制肿瘤的细胞生长,其作用机制与调控肿瘤细胞的增殖和血管形成密切相关。     

Influence of linomide on local tumor growth and metastasis of the human hormone-resistant prostate cancer cell line PC3 in an orthotopic model

OBJECTIVE:It has been demonstrated that quinoline-3-carboxamide, linomide, inhibited angiogenesis and reduced the volume of tumors grown from human hormone-resistant prostate cancer cell lines after subcutaneous implantation in mice. However, subcutaneous xenograft models may not mimic human conditions due to the absence of prostatic stromal cells at the ectopic site. Therefore, we investigated the influence of linomide on local tumor growth and metastasis of the human hormone-resistant prostate cancer cell line PC-3 in an orthotopic model. METHODS: In 30 athymic nude mice, 5x10(5) PC-3 cells were injected into the dorsal prostate after surgical exposure. After 7 days, group 1 (n = 15 mice) received linomide 100 mg/kg/day in the drinking water (per os). The other 15 mice (group 2) served as controls. All mice were sacrificed after 38 days followed by macroscopical and histological evaluation of local tumor growth and metastasis. Microvessel density was determined by immunohistochemical staining for von Willebrand factor as well as silver staining followed by morphometric analysis in an area of highest vessel density. RESULTS: In the control group, local tumorigenicity and locoregional lymph node metastasis was 100%. The mean weight of the local tumor was 894 mg (395- 1,261 mg). The mean transversal diameter of the lymph node metastases was 4.0 mm (1.5-5. 4 mm). In the treatment group, local tumor growth and lymph node metastasis was 100% with a mean local tumor weight of 869 mg (232-1, 131 mg) and a mean lymph node metastasis diameter of 4.6 mm (1.3-5.9 mm). Microvessel density of the local tumor in the control and treatment group did not differ significantly. CONCLUSION: Contrary to the results reported in subcutaneous animal models, linomide per os has no effect on net tumor growth and metastasis after orthotopic implantation of the human hormone-resistant prostate cancer cell line PC-3 in nude mice.     

Vascular endothelial growth factor-C (VEGF-C) expression predicts lymph node metastasis of transitional cell carcinoma of the bladder

PURPOSE: It has been found that expression of vascular endothelial growth factor-C (VEGF-C) in several carcinomas is significantly associated with angiogenesis, lymphangiogenesis and regional lymph node metastasis. However, VEGF-C expression in bladder transitional cell carcinoma (TCC) has not yet been reported. To elucidate the role of VEGF-C in bladder TCC, we examined VEGF-C expression in bladder TCC and pelvic lymph node metastasis specimens obtained from patients who underwent radical cystectomy. METHODS: Eighty-seven patients who underwent radical cystectomy for clinically organ-confined TCC of the bladder were enrolled in the present study. No neoadjuvant treatments, except transurethral resection of the tumor, were given to these patients. The VEGF-C expressions of 87 bladder tumors and 20 pelvic lymph node metastasis specimens were examined immunohistochemically and the association between VEGF-C expression and clinicopathological factors, including angiogenesis as evaluated by microvessel density (MVD), was also examined. RESULTS: Vascular endothelial growth factor-C expression was found in the cytoplasm of tumor cells, but not in the normal transitional epithelium. Vascular endothelial growth factor-C expression was significantly associated with the pathological T stage (P = 0.0289), pelvic lymph node metastasis (P < 0.0001), lymphatic involvement (P = 0.0008), venous involvement (P = 0.0002) and high MVD (P = 0.0043). The multivariate analysis demonstrated that VEGF-C expression and high MVD in bladder TCC were independent risk factors influencing the pelvic lymph node metastasis. Moreover, the patients with VEGF-C-positive tumors had significantly poorer prognoses than those with the VEGF-C-negative tumors (P = 0.0087) in the univariate analysis. The multivariate analysis based on Cox proportional hazard model showed that the independent prognostic factors were patient age (P = 0.0132) and pelvic lymph node metastasis (P = 0.0333). CONCLUSION: The present study suggests that VEGF-C expression is an important predictive factor of pelvic lymph node metastasis in bladder cancer patients.     

膀胱移行细胞癌VEGF表达和MVD检测的临床意义

目的　探讨膀胱移行细胞癌组织中血管内皮细胞生长因子（ＶＥＧＦ） 的表达与肿瘤间质微血管密度（ＭＶＤ）检测的临床意义。　方法　采用免疫组化方法对７７ 例膀胱移行细胞癌及１０ 例正常膀胱组织进行ＶＥＧＦ多克隆抗体及第Ⅷ因子相关抗原（ＶＷＦ：Ａｇ） 单克隆抗体染色,观察膀胱移行细胞癌ＶＥＧＦ的表达与ＭＶＤ 之间的相关性。　结果　ＶＥＧＦ的表达与肿瘤间质微血管密度之间存在正相关性,二者均与膀胱移行细胞癌的病理分级显著相关,浸润性肿瘤明显高于浅表性肿瘤（Ｐ＜０ ．０５） ;术后随访６ 年,术后２ 年内复发组明显高于６ 年内未复发组（ Ｐ＜ ０ ．０５） ,但与肿瘤大小、性别、年龄无关。　结论　ＶＥＧＦ的表达为膀胱移行细胞癌的恶性表型,并与膀胱肿瘤间质微血管形成有关,上述二项指标对评估膀胱移行细胞癌的预后有重要意义。     

几个影响膀胱移行细胞癌复发因素的临床分析

目的:探讨几个临床病理因素在预测膀胱移行细胞癌复发中的价值。方法:回顾性分析252例膀胱移行细胞癌的临床资料,通过统计学评估肿瘤大小、数目、分级及对肿瘤复发的影响。结果:252例患者术后随访11～154个月,平均49.5个月。单个、2个、3个及以上肿瘤的复发率分别为20.9%、22.5%、44.4%,3个及以上肿瘤的复发率明显高于其他两组(P<0.01);肿瘤直径≤1cm、～≤2cm、～<3cm、≥3cm的复发率分别为18.6%、8.3%、15.8%、38.8%,≥3cm的肿瘤复发率明显高于其他三组(P<0.01);Ⅰ、Ⅱ、Ⅲ级的复发率分别为14.8%、24.0%、35.7%,随着肿瘤级别升高,肿瘤复发率增加(P<0.05)。结论:膀胱移行细胞癌的多灶性、肿瘤大小和分级与其复发率正相关。了解膀胱移行细胞癌患者的肿瘤多灶性、大小和分级等临床病理特征,可以预测其预后复发情况,从而有针对地采取相应有效的治疗方法及监视随访措施。     

Vascular endothelial growth factor-C expression in bladder transitional cell cancer and its relationship to lymph node metastasis

OBJECTIVE: To elucidate the role of vascular endothelial growth factor-C (VEGF-C) in bladder transitional cell carcinoma (TCC), examining VEGF-C expression in bladder TCC tissue and the association of VEGF-C with clinicopathological features, as the expression of VEGF-C in several carcinomas is significantly associated with angiogenesis, lymphangiogenesis and regional lymph node metastasis, but there are few reports of VEGF-C expression in bladder TCC. PATIENTS AND METHODS: The study included 45 patients with bladder TCC; VEGF-C expression was assessed by immunohistochemistry and the association between VEGF-C expression and angiogenesis, as evaluated by microvessel density (MVD), was examined. RESULTS: There was VEGF-C expression in the cytoplasm of tumour cells, but very little in the normal transitional epithelium. VEGF-C expression was significantly associated with tumour size, pathological T stage, pathological grade, lymphatic-venous involvement and pelvic lymph node metastasis (all P < 0.05). Multivariate analysis showed that VEGF-C expression was an exclusive independent factor influencing pelvic lymph node metastasis. Moreover, the patients with high VEGF-C expression had a markedly poorer prognosis than those with no or low VEGF-C expression (P = 0.014). A multivariate analysis based on the Cox proportional hazard model showed that lymph node metastasis was only an independent prognostic factor in the multivariate analysis using the Cox regression model (P = 0.010). CONCLUSION: The present study provides evidence supporting the involvement of VEGF-C expression in the promotion of lymph node metastasis in bladder TCC. Examination of VEGF-C expression in biopsy specimens might be beneficial in predicting pelvic lymph node metastasis.     

反应停对人肝细胞癌生长侵袭的作用

目的 观察反应停对人肝细胞癌（HCC）血管生成和肿瘤生长侵袭的干预作用。方法 建立高转移潜能人肝癌裸鼠肝原位移植模型，随机分成4组。各组模型自建立次日起分别经腹腔注射0．5％羧甲基纤维素钠（CMC）、反应停（200mg／kg体重）、紫杉醇（13mg／kg体重）、反应停（200mg／kg体重）＋紫杉醇（13mg／d）。给药第30天处死裸小鼠，观察肿瘤生长、转移情况，分别用免疫组织化学和半定量逆转录．聚合酶链反应（RT—PCR）的方法检测癌组织CD34和血管内皮生长因子（VEGF）mRNA的表达并记录微血管密度（MVD）。结果 反应停组肿瘤重量、体积均与空白对照组差异无统计学意义（P〉0．05）。各药物处理组肺转移灶计数、MVD和VEGF均低于对照组，以联合用药组最为显著。结论 反应停对HCC生长无明显抑制作用，但能抑制肿瘤血管生成并降低肺转移。     

Angiogenesis as an unfavorable factor related to lymph node metastasis in early gastric cancer

Background: Recent studies suggest that angiogenesis enhances tumor growth and metastasis. Lymph node metastasis influences the prognosis and selection of treatment modalities in cancers. In this study, the authors investigated the correlation between angiogenesis and clinicopathologic features to determine whether angiogenesis correlated with lymph node metastasis in early-stage gastric cancer. Methods: A total of 97 specimens from patients with early gastric cancer were studied by immunohistochemical methods using anti-Factor VIII-related antigen antibody. Results: Tumor size was significantly correlated with microvessel count, which increased as tumor size increased. Microvessel counts from tumors with lymphatic vessel invasion, lymph node metastasis, and submucosal invasion were significantly higher than those without. Furthermore, microvessel count was an independent factor that influenced lymph node metastasis (P=.0016) by multivariate logistic regression analysis. Conclusion: In the early stage of gastric carcinoma, angiogenesis is an independent factor that impacts on lymph node metastasis.     

膀胱癌组织中血管内皮生长因子的表达及与血管生成的关系

目的 探讨血管内皮生长因子（ＶＥＧＦ）在原发性膀胱移行细胞癌中的表达及其与膀胱癌血管生成之间的关系。方法 免疫组织化学技术检测６８例原发性膀胱移行细胞癌和７例正常膀胱组织中血管内皮生长因子的表达,测定４０例浸润性膀胱癌的微血管密度,并分析ＶＥＧＦ和ＭＶＤ间以及它们与膀胱癌病理分级和临床分期间的关系。结果 ＶＥＧＦ在正常膀胱中不表达或低表达,而在膀胱表达较强;ＶＥＧＦ表达及ＭＶＤ值均与肿瘤的病理分级     

促血管生成素-2抗体对人结肠癌鸡胚移植模型血管生成的影响

目的建立人结肠癌鸡胚移植模型,研究促血管生成素-2(Ang-2)抗体对其血管生成的影响。方法将人结肠腺癌细胞系HT-29细胞接种到鸡胚绒毛尿囊膜(CAM)上,通过解剖显微镜、光镜及免疫组织化学方法,动态观察移植瘤的血管生成特性及Ang-2抗体对其血管生成的影响。结果HT-29细胞系接种到CAM第3-7天,瘤体迅速生长,大量血管呈放射状向瘤体集中,长入或跨越接种区,部分大血管向瘤体弯曲并相应扩张,形成血管辐辏现象。给予Ang-2抗体后第5天在解剖显微镜下进行血管计数,Ang-2抗体组的血管数(37.2±4.6)明显低于癌细胞对照组(56.8±7.4),但高于空白对照组(29.5±3.1),各组间差异有统计学意义(P<0.01)。组织学检查Ang-2抗体组的微血管密度(9.6±2.4)明显低于癌细胞对照组(20.2±5.8),两者差异有统计学意义(P<0.01)。结论Ang-2抗体能抑制人结肠腺癌细胞系HT-29细胞诱导的血管生成,为结肠癌的抗血管生成治疗提供了新的途径。