结肠癌细胞上调脐静脉内皮细胞EMMPRIN的表达

目的：探讨结肠癌细胞对脐静脉内皮细胞中细胞外基质金属蛋白酶诱导因子（EMMPRIN）表达的影响,以及EMM-PRIN与肿瘤新生血管生成的关系.方法：建立结肠癌LoVo细胞与人脐静脉内皮细胞（HUVEC）共培养模型,并设HUVEC单独培养对照组,培养36 h后进行形态学观察,并应用免疫细胞化学方法检测内皮细胞EMMPRIN的表达.结果：共培养组HUVEC形成大量管样结构,且EMMPRIN的表达明显强于HUVEC单独培养对照组强.结论：结肠癌细胞上调HUVEC EMMPRIN的表达,并诱导HUVEC管样结构的的形成,EMMPRIN的表达可能与肿瘤新生血管生成具有一定的相关性.     

32P-磷酸铬-聚 L-乳酸缓释粒子的制备及其放射性释出和生物分布

Objective The aim of this study was to prepare the 32P-chromic phosphate-poly(L-lac-tide) (32P-CP-PLLA) particles with different ratio of the materials and further examine their performance in-dex in vivo and in vitro and their intracorporeal distribution. Methods The erosion, degrading rates, de-layed release velocity and radioactivity self-absorption coefficient (RSAC) of 32P-CP-PLLA particles made from different materials were investigated and compared. After the implantation of 32P-CP-PLLA particles and the injection of 32P-CP colloids in the muscular tissues, the weight loss rate and the radioactivity release rate (RRR) of the particles were calculated. The intracorporeal distribution, radioactive half-life and bio-logical effect of 32P in the targeting sites were further studied. Statistical analysis was performed with SPSS 12.0, and one-way analysis of variance and t-test were used. Results 32P-CP-PLLA particles were of green cylinder, with regular shape and radionuclide distribution. The RSAC of the particles was of little re-lation with molecular weight of PLLA and proportional to the ratio of PLLA to CP. The extracorporeal release rate increased with the reduction of molecular weight of PLLA and with the increase of the ratio of PLLA to CP. The RRR reached peak when PLLA was 3 times of CP. The 32P-CP, released with the degradation and corrosion of the particle distributed mainly in the surrounding muscles of the particle. And the peak of per-centage activity of injection dose per gram of tissue (% ID/g) in liver, spleen and bone were 1. 7887, 1. 6401 and 1. 9470 respectively, much lower than that in the 32P-CP group (4.7523, 3.9712 and 4.3174 ; all t > 2.7, all P < 0.05). The % ID/g in other organs was much less. The radioactivity effective half-life in the targeting sites increased to about 13 d. There was widespread necrosis around the particles with no ex-istence of normal tissues among them. And no abnormality in spleen and liver was found. Conclusion As a better dosage form of pure β-particle emitter, 32P-CP-PLLA, which can increase the targeting radioactive dosage and effective half-life in the implanting sites, can be served as an potential implanting agent for onco-therapy with a better perspective.     

脂肪酸合酶抑制剂对大肠癌细胞NF-κB活性的抑制作用

目的　探讨脂肪酸合酶抑制剂对大肠癌细胞NF κB活性的抑制作用。方法　用脂肪酸合酶抑制剂(FASI) 浅蓝菌素处理大肠癌LoVo细胞株 ,用凝胶电泳迁移率法 (EMSA)检测NF κB活性。结果　实验分别用不同浓度浅蓝菌素 (10 -9～ 10 -5M )处理LoVo细胞 12h后 ,可抑制NF κB活化 ,其抑制程度呈剂量依赖性递减 ,与对照组相比较浅蓝菌素 (10 -9～ 10 -5M )处理LoVo细胞 12h后NF κB条带扫描像素积分比分别为 0 .787,0 .45 1,0 .379,0 .338,0 .32 2。结论　浅蓝菌素处理人大肠癌LoVo细胞后 ,NF κB活化程度随浅蓝菌素的剂量递增而递减。提示浅蓝菌素对LoVo细胞NF κB活性的具有抑制作用。     

高压氧对小鼠CT26结肠腺癌细胞周期和荷瘤小鼠肿瘤生长的影响

目的探讨高压氧(HBO)对小鼠CT26结肠癌细胞周期和荷瘤小鼠肿瘤生长的影响。方法应用流式细胞仪检测对照组和HBO组CT26癌细胞的细胞周期;建立小鼠结肠癌移植瘤模型,观察0.2MPaHBO对CT26癌细胞移植瘤生长的影响。结果对照组细胞在G0G1期、S期、G2M期的比例分别为74.82%、20.38%、4.80%;而HBO后12h组为66.48%、33.16%、0.36%,HBO后24h组为55.89%、40.79%、3.32%。HBO组小鼠肿瘤的体积和重量较模型对照组降低,肿瘤体积抑制率为32.39%,重量抑制率为35.77%。结论HBO可使CT26细胞在S期积蓄,并抑制荷瘤小鼠移植瘤的生长。     

维生素D、钙与大肠肿瘤

钙离子在机体一系列生命活动中起着重要作用,而钙的自身代谢常受维生素D的调控。这已被人们所广泛认识。但维生素D和钙对大肠肿瘤的发生发展之影响及机理尚鲜为人知。近年陆续有文献报道,维生素D、钙能抑制大肠肿瘤的发生和发展。本文拟就这方面的研究近况作以下概述。     

32P-磷酸铬胶体局部给药在肝癌淋巴道转移小鼠的体内分布

目的 研究^32P-磷酸铬胶体（^32P-胶体）局部给药在腹水型肝癌淋巴道转移小鼠的体内分布。方法 在30只KM小鼠爪垫下注射H22腹水型肝癌细胞，建立淋巴道转移模型，动脉观察^32P-胶体瘤体内注射后在小鼠局部，区域淋巴结和全身各器官组织内的分布情况，以及^32P-胶体在局部淋巴结内的活度与给药剂量的关系。结果 在分期处死的小鼠中观察到，^32P-胶体主要聚集在注射局部和区域淋巴结内，肝，脾，肺等分布活度较低。区域淋巴结聚集的活度随给药剂量的增加而增高。结论 ^32P-胶体局部注射后可经淋巴道转运，并聚集在区域淋巴结，这种现象为治疗肿瘤的淋巴转移提供了重要依据。     

经纤支镜活检小细胞肺癌标本的雌、孕激素受体测定的研究

作者应用免疫组化法（ＡＢＣ）检测１９例小细胞肺癌的雌激素受体（ＥＲ）、孕激素受体（ＰＲ）、阳性率分别为３６．８４％、１５．７９％。表达类型以全细胞型为主，ＥＲ和ＰＲ的阳性率与年龄、性别及吸烟指数的多少无关；ＥＲ与ＰＲ呈正相关关系。我们认为：性激素在一些小细胞肺癌病人的发病机理中有一定的作用．ＥＲ、ＰＲ的测定为小细胞肺癌患者进行内分泌治疗提供了理论依据。     

3种结肠癌细胞株中DLC-1基因的表达及其启动子区的甲基化状态研究

目的:研究候选抑癌基因DLC-1在结肠癌细胞株中的表达及其启动子区的甲基化状态,初步探讨结肠癌细胞株DLC-1基因表达水平与其启动子区甲基化的相关性.方法:采用RT-PCR技术分别检测DLC-1基因在人结肠癌细胞株CaCo-2、HT-29和LoVo中的表达水平;应用甲基化特异性PCR(MSP)方法和亚硫酸氢盐修饰DNA测序检测启动子区域甲基化状态;分别用0、5、10 μmol·L-1浓度的去甲基化药物5氮杂胞苷处理DLC-1基因启动子区域高甲基化状态细胞后,再检测DLC-1基因mRNA表达水平.结果:人结肠癌细胞株CaCo-2和LoVo中DLC-1 mRNA呈阳性表达,HT-29中的表达呈阴性表达;CaCo-2和LoVo细胞DLC-1基因启动子区域未发生甲基化,而HT-29出现启动子区高甲基化状态;经5氮杂胞苷药物干预后,HT-29结肠癌细胞的DLC-1基因表达明显增强.结论:结肠癌细胞株HT-29中DLC-1基因表达沉默与启动子区高甲基化状态有关.     

RegⅣ基因在大肠癌中抗凋亡作用的体外研究

目的观察RegⅣ基因在大肠癌细胞系中的表达情况及其体外抗凋亡作用。方法采用RT-PCR和免疫组织化学染色法检测4种大肠癌细胞系中RegⅣ基因的表达,通过MTT法分析不同浓度的姜黄素对4种大肠癌细胞系(HT-29、Caco2、Sw480和Lovo)的生长抑制作用,应用流式细胞仪评价RegⅣ基因的抗凋亡作用。结果RegⅣmRNA在HT-29细胞系高表达,Caco2细胞系较高表达,Sw480细胞系较低表达,Lovo细胞系不表达;RegⅣ蛋白在HT-29细胞胞核和胞质内表达阳性,Lovo细胞胞核和胞质表达阴性,Sw480细胞胞质内表达阳性,Caco2细胞胞质内表达弱阳性。不同浓度的姜黄素对4种细胞系的生长抑制作用强弱依次为Lovo>Sw480>Caco2>HT-29;用20μmol.L-1的姜黄素处理24 h后,4种细胞系的凋亡率大小依次为Lovo>Sw480>Caco2>HT-29。结论RegⅣ基因高表达与大肠癌发生可能有关;RegⅣ基因在大肠癌中可能具有抗凋亡作用。     

32P-磷酸铬-聚 L-乳酸缓释粒子的制备及其放射性释出和生物分布

Objective The aim of this study was to prepare the 32P-chromic phosphate-poly(L-lac-tide) (32P-CP-PLLA) particles with different ratio of the materials and further examine their performance in-dex in vivo and in vitro and their intracorporeal distribution. Methods The erosion, degrading rates, de-layed release velocity and radioactivity self-absorption coefficient (RSAC) of 32P-CP-PLLA particles made from different materials were investigated and compared. After the implantation of 32P-CP-PLLA particles and the injection of 32P-CP colloids in the muscular tissues, the weight loss rate and the radioactivity release rate (RRR) of the particles were calculated. The intracorporeal distribution, radioactive half-life and bio-logical effect of 32P in the targeting sites were further studied. Statistical analysis was performed with SPSS 12.0, and one-way analysis of variance and t-test were used. Results 32P-CP-PLLA particles were of green cylinder, with regular shape and radionuclide distribution. The RSAC of the particles was of little re-lation with molecular weight of PLLA and proportional to the ratio of PLLA to CP. The extracorporeal release rate increased with the reduction of molecular weight of PLLA and with the increase of the ratio of PLLA to CP. The RRR reached peak when PLLA was 3 times of CP. The 32P-CP, released with the degradation and corrosion of the particle distributed mainly in the surrounding muscles of the particle. And the peak of per-centage activity of injection dose per gram of tissue (% ID/g) in liver, spleen and bone were 1. 7887, 1. 6401 and 1. 9470 respectively, much lower than that in the 32P-CP group (4.7523, 3.9712 and 4.3174 ; all t > 2.7, all P < 0.05). The % ID/g in other organs was much less. The radioactivity effective half-life in the targeting sites increased to about 13 d. There was widespread necrosis around the particles with no ex-istence of normal tissues among them. And no abnormality in spleen and liver was found. Conclusion As a better dosage form of pure β-particle emitter, 32P-CP-PLLA, which can increase the targeting radioactive dosage and effective half-life in the implanting sites, can be served as an potential implanting agent for onco-therapy with a better perspective.