Roquinimex对人大肠癌细胞株SW1116体内外抑制作用的实验研究

目的观察Roquinimex对人大肠癌细胞株SW1116体内外抑瘤效应,并探讨其抗血管生长作用的机制可能.方法采用MTT方法测定Roquinimex对人大肠癌细胞株SW1116的体外抑制效应.同时运用免疫组化方法检测人大肠癌细胞株SW1116裸鼠移植瘤块的瘤灶内微血管密度(MVD),比较各剂量组对血管生长抑制作用的强弱.结果MTT结果提示SW1116细胞对Roquinimex并不敏感,但体内实验显示Roquinimex能明显抑制裸鼠移植瘤的生长,各剂量组的瘤块平均体积均小于对照组(P＜0.01).结论Roquinimex能抑制人大肠癌裸鼠移植瘤的体内生长,并能明显降低瘤块内微血管密度,是一种有效的血管生长抑制剂.     

天花粉蛋白对荷人结肠癌SW-1116裸鼠的体内实验研究

目的：研究天花粉蛋白（TCS>）体内抗结肠癌作用。方法：将人结肠癌SW－1116移植于Swiss-Df品系8周龄裸小鼠肾包膜下，次日以不同剂量TCS注射入探小鼠腹膜腔内，以丝裂霉素（MMC）为阳性对照，生理盐水（NS）为阴性对照，每日给药一次，连续五日，观察天花粉蛋白对移植瘤体内抑制情况。结果：TCS剂量为0.75mg/kg组对移植瘤SW－1116的抑癌率为41.2％（P＜0．001），较1.0mg／kgMMC组（抑癌率31.28％）为佳；0.5mg/kgTCS组抑癌率为27.50％（P＜0.05），远小于TCS对小鼠的半数致死量（13．4mg/kg）。结论：TCS对结肠癌SW－1116裸鼠有体内抑癌作用。     

人巨噬细胞金属弹性蛋白酶对人胃癌细胞COX-2和VEGF体内表达的影响

目的：探讨体内人巨噬细胞金属弹性蛋白酶（HME）对人胃癌细胞环氧合酶-2和血管内皮生长因子（VEGF）表达的影响。方法：选取BALB/c nu/nu裸鼠24只构建人胃癌细胞SCG-7901裸鼠皮下移植模型,随机分为对照组和HME干预组,其中HME干预剂量分别为0.2mg/kg、0.4mg/kg、0.8mg/kg,对照组给予等体积0.9%氯化钠。干预6周后处死动物,测量鼠重、瘤重、肿瘤大小,计算抑瘤率;采用Western blot和免疫组织化学方法检测移植瘤组织中COX-2和VEGF的表达;CD34标记血管内皮细胞计数肿瘤微血管密度（MVD）。结果：与对照组相比各剂量组HME均能明显抑制皮下移植瘤生长（ P <0.05）;且在HME各剂量组中0.8mg/kg组抑瘤作用最明显。HME能明显抑制移植瘤组织中COX-2和VEGF的表达,并明显降低肿瘤MVD值（ P <0.05）。结论：HME通过抑制肿瘤微血管形成来抑制肿瘤的生长;HME抑瘤作用具有剂量依赖性。     

桑黄灵芝UE-1对肿瘤生长及血管新生的抑制作用

目的观察桑黄灵芝UE-1对Lewis肺癌生长及血管新生的抑制作用。方法建立Lewis肺癌实体瘤模型,观察其抗肿瘤作用;通过免疫组织化学染色,检测肿瘤微血管密度;采用新生血管计数实验检测UE-1对肿瘤组织血管生成的影响;通过鸡胚尿囊膜血管新生实验观察UE-1多糖的抗血管新生作用。结果实体瘤模型中,UE-1组移植瘤重量和体积明显低于对照组（P<0.05）,且微血管密度值也低于对照组（P<0.05）;肿瘤诱导新生血管中UE-1组肿瘤周围的血管数明显少于对照组（P<0.05）;鸡胚尿囊膜血管新生实验显示UE-1多糖具有抑制血管新生作用。结论桑黄灵芝UE-1可抑制Lewis肺癌的生长,可能是通过抑制肿瘤血管新生来发挥其抑瘤作用。     

肝素和氢化可的松对人肺癌抑瘤作用的体内实验研究

目的：研究肝素和氢化可的松的联合应用对人肺癌裸鼠皮下移植瘤生长抑制作用和对肿瘤血管生成、肿瘤细胞增殖及凋亡的影响，探讨肝素和氢化可的松联合应用抑制肿瘤血管生成的可能性。方法：建立人肺癌裸鼠皮下移植瘤模型，通过观察瘤体生长情况、免疫组化法测定微血管密度计数和肿瘤组织的增殖情况、电镜观察肿瘤组织凋亡情况和原位细胞凋亡检测，研究肝素和氢化可的松联合应用的抗血管生成和抑瘤作用。结果：肝素和氢化可的松治疗组瘤体生长较对照组明显受抑，且肿瘤组织微血管生成减少、增殖降低、凋亡增多。结论：肝素和氢化可的松联合应用具有明显的抗血管生成和抑瘤作用。     

泰素帝对荷瘤小鼠肿瘤组织VEGF和TSP1表达的影响

目的：观察泰素帝对裸鼠人大肠癌LOVO细胞皮下移植瘤血管生成抑制作用及其作用机理。方法：通过建立裸鼠人大肠癌LOVO细胞皮下移植瘤模型,观察泰素帝的抑瘤作用,并采用免疫组织化学法检测泰素帝对肿瘤组织MVD、VEGF、TSP1表达的影响。结果：泰素帝的抑瘤率为72．4％。泰素帝能显著降低肿瘤微血管密度,下调VEGF和上调TSP1的表达。结论：泰素帝可能通过抑制肿瘤血管生成而发挥抗肿瘤作用;下调VEGF可能是泰素帝抗血管生成作用机理之一;上调TSP1可能是泰素帝抗血管生成另一作用机理。     

n-3PUFA联合5-FU对SW480细胞裸鼠皮下移植瘤的疗效观察

目的:建立人结肠癌SW480细胞裸鼠皮下移植瘤模型,观察n-3 PUFA联合5-FU对SW480细胞裸鼠皮下移植瘤的疗效.方法:SW480细胞裸鼠皮下移植瘤模型随机分成正常饲料组、5-FU组、n-3 PUFA高剂量组、n-3 PUFA低剂量组、n-3 PUFA对照组,除正常饲料组、5-FU组添加正常饲料外,其余各组添加不同含量的n-3 PUFA饲料,同时,各给药组腹腔注射5-FU(35 mg/kg),一周2次,连续3周,每次给药前称体重、测量肿瘤的长径和短径;末次给药后,处死动物,剥离肿瘤并称重;通过各组肿瘤的生长曲线和抑瘤率观察SW480细胞裸鼠皮下移植瘤的抑制效果.结果:与正常饲料组比较,n-3 PUFA高、低剂量组和5-FU组肿瘤平均体积显著性减小(P＜ 0.05);肿瘤平均重量明显减轻(P＜0.05).结论:n-3 PUFA联合5-FU对SW480细胞裸鼠皮下移植瘤有一定的抑瘤作用.     

沉默PCAF基因抑制人肾上腺皮质癌裸鼠移植瘤生长及血管生成的实验研究

目的 探讨靶向沉默肾上腺皮质癌SW13细胞PCAF基因表达对裸鼠移植瘤生长以及血管生成的抑制作用及其机制。方法 pLenti6.3-MiRNA-PCAF重组慢病毒及pLenti6.3-MiRNA-NC重组慢病毒分别感染SW13细胞,将感染后的两组细胞及未处理的SW13细胞分别接种于15只裸鼠腋下,构建裸鼠移植瘤模型,分为实验组、阴性对照组、空白对照组,并观察各组肿瘤生长情况。Western blot、荧光定量PCR检测移植瘤组织PCAF蛋白、mRNA表达水平,HE染色法观察各组移植瘤组织形态学变化,免疫组织化学法检测VEGF表达及微血管密度。结果 实验组小鼠的肿瘤体积较阴性对照组和空白对照组显著缩小,肿瘤抑制率分别为49.2%和52.9%;PCAF蛋白相对表达水平较阴性对照组下降58.4%,mRNA相对表达水平较阴性对照组下降74.3%;实验组与阴性对照组和空白对照组相比,瘤内VEGF蛋白表达明显下调;实验组微血管密度（19.4±4.2）与阴性对照组（42.7±6.5）和空白对照组（51.3±8.6）相比明显下降。结论 慢病毒介导的pLenti6.3-MiRNAPCAF能有效抑制肾上腺皮质癌细胞裸鼠移植瘤的生长及血管生成。     

TL对人胰腺癌细胞裸鼠移植瘤的治疗作用及抑制血管生成的研究

目的：探讨雷公藤内酯醇（TL）对人胰腺癌细胞SW1990移植瘤的生长及新生血管生成的抑制作用。方法：通过人胰腺癌裸鼠皮下移植实验，观察不同剂量TL对移植瘤生长抑制作用；应用免疫组化和RT-PCR研究裸鼠移植瘤组织VEGF表达变化，计算肿瘤组织微血管密度（MVD）。结果：各实验组（TL0．125、0．25和0．5mg·^-1kg·day^-1）抑瘤率分别达到66．16％、78．14％和89．92％，与对照组相比，肿瘤生长明显受抑，并具有剂量和时间依赖性。对照组和各实验纽瘤组织MVD分别为36．25±8．64、22．75±6．67、17．65±7．11和9．87±3．34（P〈0．01）；TL抑制移植瘤VEGF基因和蛋白表达．且VEGF基因下调与MVD的减少具有相关性（r=0．7424，P〈0．01）．结论：TL具有显著的抗胰腺癌移植瘤作用．其机制可能与抑制肿瘤新生血管生成有关。     

紫杉醇节律化疗联合EGCG抑制胃癌生长和肿瘤血管生成的实验研究

目的:探讨低剂量紫杉醇联合表没食子儿茶素没食子酸酯(EGCG)对胃癌肿瘤血管生成的影响,并观察其抑瘤效果。方法:建立裸鼠人胃癌移植瘤模型,分别给予0.9%NaCl溶液、最大耐受剂量(MTD)紫杉醇、低剂量紫杉醇、EGCG及低剂量紫杉醇联合EGCG腹腔注射,观察肿瘤生长情况。免疫组化染色,测定CD31和血管内皮生长因子(VEGF)表达情况。结果:对照组肿瘤生长迅速,其他治疗组肿瘤生长都受到了抑制,联合治疗组抑瘤效果最明显,各组比较差异有统计学意义,P<0.05。与对照组及MTD组相比,低剂量紫杉醇组肿瘤组织内的微血管密度(MVD)及VEGF表达均下降,合用EGCG后,MVD和VEGF表达下降更明显,P<0.05。结论:低剂量紫杉醇化疗能够有效抑制裸鼠胃癌移植瘤的生长及微血管的形成,与EGCG联合应用时效果增强。     

Application of anti-sialyl Lea monoclonal antibody, KM231, for immunotherapy of cancer.

A mouse monoclonal antibody (MoAb), KM231 raised against human gastric cancer was found to recognize sialyl Lea -epitope expressed on glycoprotein and glycolipid with high affinity. KM231 reacted with many human gastrointestinal cancer tissues and could detect the antigen shed in sera of cancer patients. The present study was designed to evaluate competence of KM231 for immunotherapy of cancer. We first confirmed that KM231 could probe the cancer cells in vivo by injecting biotinylated KM231 into nude mice bearing human colorectal carcinoma cell, SW1116. Light- and electron-microscopic examination showed that the MoAb was localized in the tumor tissues and bound to the plasma membrane and cytoplasmic endosomes. Imaging studies with 125I-labeled KM231 revealed specific localization of the antibody in SW1116 tumors transplanted into nude mice. From Scatchard analysis of KM231 binding, the number of KM231 molecules bound to per SW1116 cell was calculated approximately 1.9 x 10(6) and the association constant was 1.3 x 10(8) liter/mol. We made KM231-ricin A chain immunotoxin for evaluating the tumoricidal effect of KM231. The immunotoxin exerted strong cytotoxicity toward sialyl Lea-expressing tumor cells specifically in vitro, but not toward sialyl Lea non-expressing cells. The in vivo tumoricidal effect of the immunotoxin was examined on ascites and subcutaneous xenograft tumors in nude mice. Three intraperitoneal injections of the immunotoxin (1.6 x 10(-6) mol) into nude mice bearing SW1116 ascites tumor resulted in extension of survival by 204% compared with controls. Further, repeated intraperitoneal administration of the immunotoxin (1.4 - 2 x 10(-6) mol) significantly inhibited the growth of established subcutaneous tumor (ratio of tumor inhibition = 0.7 - 0.54). These results indicated that KM231 has the ability to probe sialyl Lea-expressing tumor cells in vivo with high efficiency and to become tumoricidal drug when it conjugated with cytotoxic reagents like ricin A chain.     

Tumorigenicity in athymic mice of the human colon carcinoma cell line SW1116 expressing the tumor-associated antigenic determinant CA 19-9

The human colorectal carcinoma cell line SW1116 under optimal growth conditions synthesized and shed antigens bearing the monoclonal antibody-defined carbohydrate determinant CA 19-9. Antigen expressing CA 19-9 in cell culture supernatant was quantitated by an immunoradiometric assay for CA 19-9. Injection of SW1116 cells s.c. into athymic BALB/c mice resulted in the growth of moderately differentiated tumors possessing a distinct morphological resemblance to a typical adenocarcinoma of the colon. Intervals to tumor appearance were dependent on inoculum dose, but 95% of mice at both 5 X 10(6) and 10(7) cells/mouse developed tumors within 14 to 21 days. CA 19-9 antigen was detected in the sera of all nude mice with SW1116 tumors, and antigen concentration correlated (r = 0.77) with tumor volume throughout the 9-week study. The half-life of this antigen in serum following tumor excision from nude mice was 6.5 +/- 1.5 (S.D.) hr. Carcinoembryonic antigen was also detected in serum from mice bearing SW1116 tumors by an immunoradiometric assay for carcinoembryonic antigen, but its concentration correlated (r = 0.86) with tumor volume for only the first 4 weeks of tumor growth. Significant levels of endogenous immunoglobulin G1 and immunoglobulin G3 antibodies to CA 19-9 antigen were found in the serum of nude mice with SW1116 tumors by radioimmunodiffusion, but no apparent relationship between antibody titer and tumor growth or CA 19-9 antigen level in serum was evident. This tumor model may be useful in devising radioimmunodetection and immunotherapeutic strategies for primary and metastatic human colon carcinomas.     

Efficacy and specificity of a monoclonal antibody-drug conjugate in chemotherapy by intratumoral injection.

The murine monoclonal antibody (Mab) A7 conjugated to neocarzinostatin (A7-NCS) was injected intratumorally (IT) into tumor bearing nude mice. Its pharmacokinetics and tumoricidal effects were compared in the high, moderate and low antigen expressing xenograft for SW1116, WiDr and KB tumor-bearing nude mice, respectively. When injected IT into nude mice, [125I]A7-NCS was retained in the tumors according to the degree of antigen expression; it was also disseminated into the blood inverse proportion to the antigen expression. Addition of an excess amount of Mab A7 reduced [125I]-A7-NCS accumulation in SW1116 xenograft and elevated the [125I]A7-NCS concentration in the circulation. Complete tumor reduction was found in all 5 mice with SW1116 tumor, and 2 of 5 mice with WiDr tumor. However, only incomplete tumor suppression was observed in mice with the KB tumor. The significant tumor reduction in SW1116 bearing nude mice was attenuated when excess of Mab A7 was simultaneously administered with A7-NCS. These findings indicate that A7-NCS was localized in the target tumors and exerted its tumoricidal effects depending on the degree of antigen-antibody interaction when administered IT. Thus, A7-NCS can be used successfully in vivo for local therapy, auguring new and promising applications for local cancer therapy.     

Efficacy and Specificity of a Monoclonal Antibody-Drug Conjugate in Chemotherapy by Intratumoral Injection

The murine monoclonal antibody (Mab) A7 conjugated to neocarzinostatin (A7-NCS) was injected intratumorally (IT) into tumor bearing nude mice. Its pharmacokinetics and tumoricidal effects were compared in the high, moderate and low antigen expressing xenograft for SW1116, WiDr and KB tumor-bearing nude mice, respectively. When injected IT into nude mice, [¹²⁵I]A7-NCS was retained in the tumors according to the degree of antigen expression; it was also disseminated into the blood inverse proportion to the antigen expression. Addition of an excess amount of Mab A7 reduced [¹²⁵I]-A7-NCS accumulation in SW1116 xenograft and elevated the [¹²⁵I]A7-NCS concentration in the circulation. Complete tumor reduction was found in all 5 mice with SW1116 tumor, and 2 of 5 mice with WiDr tumor. However, only incomplete tumor suppression was observed in mice with the KB tumor. The significant tumor reduction in SW1116 bearing nude mice was attenuated when excess of Mab A7 was simultaneously administered with A7-NCS- These findings indicate that A7-NCS was localized in the target tumors and exerted its tumoricidal effects depending on the degree of antigen-antibody interaction when administered IT. Thus, A7-NCS can be used successfully in vivo for local therapy, auguring new and promising applications for local cancer therapy.     

arresten基因转染对裸鼠实验性结肠癌肝转移的抑制作用

背景与目的:肝转移是晚期结肠癌患者最常见的致死原因,也是最常见的内脏转移,高达50%以上的结肠癌患者都会出现肝转移.本研究探讨arresten基因转染对人结肠癌LoVo细胞形成的裸鼠实验性结肠癌肝转移的影响.方法:通过脂质体转染法将arresten基因导入LoVo细胞,RT-PCR、Western blot分别检测arresten在mRNA、蛋白水平的表达,四甲基噻唑蓝(MTT)比色法检测arresten对LoVo细胞增殖的影响;通过建立裸鼠实验性结肠癌肝转移模型了解arresten对肿瘤转移的抑制作用;FⅧRag多克隆抗体染色的免疫组化方法检测肿瘤组织的微血管密度(microvessel density,MVD).结果:RT-PCR、Western blot结果显示arresten基因成功导入LoVo细胞并有arresten蛋白的表达.MTT比色法显示不同浓度的arresten对LoVo细胞增殖的影响差异无统计学意义(P＞0.05).导入arresten基因的LoVo细胞转移率为(25.1±2.1)%,低于未导入arresten基因的LoVo细胞的(87.1±1.2)%和对照组的(87.1±1.5)%,其差异均有统计学意义(P值均＜0.05).pSecTag2-arresten组裸鼠形成的肿瘤结节数为4.5 0.5,低于另外两组的19.6±2.5和20.4±2.5,其差异均有统计学意义(P值均＜0.05).pSeeTag2-arresten组形成的肿瘤MVD为15.3±3.5,低于另外两组(分别为42.2±2.6、45.6 5.1),其差异均有统计学意义(P值均＜0.05).结论:arresten能抑制结肠癌肝转移,其作用机制可能与arresten抑制肿瘤血管生成有关.     

塞来昔布对实验性结肠癌原位移植瘤生长及血管形成的影响

目的:探讨塞来昔布对实验性结肠癌原位移植瘤生长及血管形成的影响。方法:使用对数生长期的人结肠癌细胞(HT-29)于裸鼠皮下接种成瘤后原位种植。术后随机分为对照组(C组)及塞来昔布高、中、低剂量组(H、M、L组)共四组进行研究。结果:24只裸鼠实验期间无1只死亡,成瘤率为100%,比较各组原位移植瘤体积和瘤质量差异有统计学意义,P值均<0·05。L、M和H组的抑瘤率分别为25·30%、38·80%和76·92%,与对照组比较差异有统计学意义,P=0·000,且存在明显的剂量依赖。干预组瘤组织中MVD、VEGFmRNA、MMP-2mRNA和匀浆上清中PGE2含量与对照组相比差异有统计学意义,P值分别为0·050、0·050、0·050和0·010,随着剂量增加,MVD、VEGFmRNA、MMP-2mRNA和匀浆上清中PGE2含量逐渐降低。瘤组织中PGE2含量与瘤质量,以及MVD与VEGFmRNA、MMP-2mRNA均存在显著的正相关性,r=0·8814,P=0·000;r=0·8573,P=0·000;r=0·6427,P=0·001。结论:塞来昔布通过抑制人结肠癌裸鼠原位移植瘤环氧化酶-2活性,抑制PGE2合成、VEGFmRNA和MMP-2mRNA表达,抑制肿瘤的血管形成,从而对结肠癌的生长有抑制作用。     

Muscarinic cholinergic receptor antagonist inhibits the growth and angiogenesis of small cell lung cancer in vivo北大核心CSCD

Objective: To investigate the effects of muscarinic cholinergic receptor 3 (M3R) antagonist 4-diphenylacetoxy-N -methylpiperidine methiodide (4-DAMP) on the growth of small cell lung cancer and angiogenesis in nude mice. Methods: The mRNA and protein expressions of M3R in human small cell lung cancer SBC3 cells were detected by RT-PCR and Western blotting, respectively. The subcutaneous transplantation tumor model of SBC3 cells in nude mice was established. The model mice were randomly divided intofour groups, then intraperitoneally injected with 0.9% sodium chloride solution (as the control group) and different doses of 4-DAMP (0.5, 1 and 2 mg/kg), respectively (once a day, for 15 days). The size of xenograft tumor was measured every 2 days. After the nude mice were sacrificed, the tumor mass was measured, and the tumor inhibitory rate was calculated. The expressions of M3R and vascular endothelial growth factor (VEGF) in the tumor tissues were detected by real-time fluorescent quantitative PCR and Western blotting, respectively. The microvessel density (MVD) and VEGF expression were detected by immunohistochemistry. Results: Human small cell lung cancer SBC3 cells expressed M3R mRNA and protein. After the subcutaneous transplantation tumor model of SBC3 cells in nude mice was successfully established and treated with different doses (0.5-2 mg/kg) of 4-DAMP, the sizes of xenograft tumors were significantly decreased as compared with the control group (all P < 0.05), and the weights of tumor tissues were significantly reduced (all P < 0.01). The tumor growth inhibitory rates in 0.5, 1 and 2 mg/kg 4-DAMP-treated groups were 15.82%, 33.54% and 55.06%, respectively. Furthermore, the relative expression levels of M3R and VEGF as well as MVD in the tumor tissues of 0.5, 1 and 2 mg/kg 4-DAMP-treated groups were significantly down-regulated as compared with the control group (all P < 0.05). Conclusion: M3R antagonist 4-DAMP can inhibit the growth and angiogenesis of human small cell lung cancer in nude mice. Copyright © 2017 by TUMOR All rights reserved.     

pGPU6/GFP/Neo-hTERT-shRNA对结直肠癌SW480细胞裸鼠移植瘤的抑制

目的:研究靶向hTERT基因的重组质粒pGPU6/GFP/Neo-hTERT-shRNA对人结直肠癌SW480细胞裸鼠移植瘤的治疗作用。方法:于裸鼠右侧腋下皮下注射人结直肠癌SW480细胞建立结直肠癌移植瘤动物模型,随机分为生理盐水组(NS组)、pGPU6/GFP/Neo-NC-shRNA组(NC-shRNA组)和pGPU6/GFP/Neo-hTERT-shRNA组(hTERT-shRNA组),各组连续进行相应治疗6次后,观察肿瘤的生长状况,测量肿瘤体积并绘制肿瘤生长曲线,H-E染色观察肿瘤组织形态学变化,免疫组织化学法检测移植瘤组织中hTERT蛋白的表达,TUNEL法检肿瘤组织中细胞凋亡情况,RT-PCR法检测瘤组织中hTERT mR-NA的表达。结果:与NC-shRNA组和NS组比较,hTERT-shRNA组移植瘤体积增长速度减慢;hTERT-shRNA组移植瘤组织中见肿瘤细胞形态明显改变,凋亡细胞数明显增多[(36.30±5.05)%vs(5.25±1.06)%、(6.95±1.07)%,P<0.01];hTERT-shRNA组hTERT的mRNA和蛋白表达均明显受到抑制(171.42±30.94 vs 146.89±21.43、137.35±25.49,P<0.01;0.39±0.09 vs 0.81±0.335、0.750±0.206,P<0.05)。结论:重组质粒pGPU6/GFP/Neo-hTERT-shRNA通过下调hTERT mRNA和蛋白水平的表达促进肿瘤细胞的凋亡,抑制结直肠癌移植瘤的生长。     

Influence of cocktails of labeled monoclonal antibodies on the localization of antibodies in human tumor xenografts

In order to evaluate the usefulness of cocktails of labeled monoclonal antibodies (MoAbs) recognizing different antigen molecules to localize human cancer xenografts, we have compared the potential of three MoAbs recognizing representative cancer-associated CA 19-9, 17-1A and CEA antigens when administered alone or in combination. Specific binding of radioiodinated F(ab')2 fragments of these three MoAbs was observed to human colorectal cancer cell lines SW1116, LS180 and Co-3. The percentage of in vitro cell binding of a cocktail of any two MoAbs to cancer cells was equal to the average of those obtained with the two MoAbs alone. The three MoAbs were preferentially localized in tumor tissues xenografted in nude mice. When cocktails of any two MoAbs were used, the obtained tumor-to-normal tissue ratios and percent of injected dose per gram of tumor were between the levels obtained for each MoAb when administered alone, in all three tumors transplanted in nude mice. These data suggest that, although cocktails of labeled MoAbs recognizing different antigens may extend the spectrum of tumor specificities, their use does not improve the tumor localization ability of MoAb-conjugates.     

香加皮杠柳苷对SW480细胞在裸鼠体内的成瘤抑制作用及其机制研究

背景与目的:研究香加皮杠柳苷(periploein extracted from cortex periplocae,CPP)对人结肠癌SW480细胞株在裸鼠体内的成瘤抑制作用及其机制.材料与方法:将SW480细胞经皮下接种Balb/c-nu/nu裸小鼠,构建裸鼠SW480细胞荷瘤动物模型,观察CPP作用后移植瘤体积和重量的变化,HE染色光镜下观察移植瘤组织形态学变化,免疫组织化学方法检测瘤组织内Wnt/β-catenin信号通路中核心成分β-catenin及其下游靶蛋白Survivin和C-myc表达的变化. 结果:CPP在体内能明显抑制SW480细胞荷瘤小鼠移植瘤的生长,其肿瘤体积和重量均被明显抑制,抑瘤率为61.4l%(P<0.01).CPP治疗组小鼠的移植瘤组织出现明显炎性细胞浸润和坏死性变化;肿瘤组织内β-catenin、Survivin和C-myc蛋白表达水平明显下降(P<0.05或P<0.01).结论:CPP可抑制结肠癌细胞SW480在小鼠体内的增殖,其作用机制可能与Wnt/β-catenin信号分子的表达下调有关.