刺五加茎对肥大细胞依赖的过敏反应的作用

作者研究了大蒜水提取物(GAE)和乙醇提取物(GEE)体外对 ConA 刺激的 AO大鼠胸腺细胞和脾细胞增殖的调节作用。实验用 A、B 2种大蒜粉末样品,A 中大蒜烯(ajoenes)的含量是 B 的40～50倍,将A 和 B 均分别制成水提取物和乙醇提取物。大鼠胸腺细胞5×10~6/mL 和脾细胞2×10~6/     

非常规分割放射治疗对晚期鼻咽癌组织细胞增殖凋亡的意义

为了提高鼻咽癌 (NPC)的治疗效果 ,各种分割放射治疗方式越来越受到重视。笔者检测了 6d/周非常规分割及常规分割放射治疗期间肿瘤细胞的增殖凋亡情况和近期疗效 ,以期为临床寻找一种新的分割模式提供理论依据。一、材料和方法1.临床资料 :选取 2 0 0 0年 1月至 2 0 0 2年 4月经病理确诊初次接受放射治疗的Ⅲ～Ⅳ期NPC患者 75例 ,采用信封法随机分为常规放射治疗组 (对照组 36例 )和非常规分割放射治疗组 (研究组 39例 ) ,详见表 1。表 1　 两组临床资料比较 (例 )项目对照组研究组 χ2 值P值例数 3 63 9性别 0 .0 0 0 .970　男 2 2 2 4…     

PDGF-B链基因三链形成寡核苷酸对C6胶质瘤细胞增殖和细胞周期的影响

目的观察PDGF-B链基因三链形成寡核苷酸(triplex-forming oligonucleotide,TFO)对C6胶质瘤细胞增殖和细胞周期的影响.方法应用免疫荧光流式细胞技术观察PDGF-B链基因TFO对C6胶质瘤细胞PDGF-B、PCNA表达的影响.应用流式细胞技术观察PDGF-B链基因TFO对C6胶质瘤细胞细胞周期的影响.结果 PDGF-B链基因TFO对C6胶质瘤细胞PDGF-B链基因、PCNA的表达有明显抑制作用,而且抑制作用存在浓度依赖性.PDGF-B链基因TFO能使C6胶质瘤细胞S期的百分率明显降低,阻止细胞由静止期(G0-G1期)进入(S期).结论 PDGF-B链基因TFO能够抑制C6胶质瘤细胞PDGF-B链基因的表达,阻碍细胞进入S期,降低细胞增殖能力.     

增殖细胞核抗原Ki-67与肿瘤

细胞增殖不仅是人体细胞，也是所有细胞生命(包括肿瘤细胞在内)延续生命存在的形式。正常细胞和肿瘤细胞增殖的主要区别就在于前者增殖受控，后者增殖是失控的，因此有关细胞增殖的研究对肿瘤的发生、发展、预后有着极大的意义。ki-67作为与细胞核增殖相关的抗原，进来引起了广泛的关注，以下就ki-67的特性、优势及与肿瘤预后的关系综述如下。     

Effects of Imbalance of Apoptosis and Proliferation on Large Bowel Carcinogenesis in Mice

OBJECTIVE To observe the pattern of changes in the proliferation and apoptosis at different stages of large bowel carcinoma in mice, and to explore the effects of the imbalance of apoptosis and proliferation at different stages of large-intestine carcinogenesis.METHODS An experimental animal model for large intestine carcinogenesis of KUNMING-strain mice was used. The carcinomas were induced by subcuteneous injection of dimethylhydrazine (DMH) and the distribution and density changes of proliferating and apoptotic cells observed through multistages toward cancer formation. The animals were killed in groups at the 12th, 18th, 24th,and 32nd weeks of carcinoma induction. The apoptotic and proliferating cells were labeled separately using TUNEL and PCNA immunohistochemical staining methodsRF, RESULTS In the normal mouse mucosa, all the apoptotic cells were situated in the superficial layers, however, the proliferating cells were situated in the basement layers, and the amount of both were small. In the early stage of carcinoma induction, the proliferation and the apoptotic cells slightly increased in amount, but there were no obvious changes in their ratio. In the medium stage, the densities of both distinctly increased, but there were no obvious changes in the ratio. In the late stage, the densities of the proliferating and the apoptotic cells in the non-carcinoma mucosa were higher than those at other stages. The proliferating cells in the dysplastic mucosa increased progressively with the increasing degree of the lesions. Although the apoptotic cells increased, their changes did not occur with the degree of the lesions. Their ratio showed a decreasing tendency with the degree of the lesions.CONCLUSIONS (①The presence of an imbalance between cell proliferation and apoptosis was confirmed in the course of large intestine carcinogenesis in a mouse model. ②In the early stage of carcinoma induction both proliferation and apoptosis were at a low level; in the medium stage, they were both at a high level; and in the late stage (that is in carcinoma), proliferation was at a very high level, while apoptosis was at a low level. ③The proliferating cells increased progressively with the degree of dysplasia. There were no obvious changes in the apoptotic cells and their ratio to the proliferating cell sshowed a progressively increasing tendency. ④In the stage of cancer formation, the most essential change was the excessive decrease in the ratio of apoptosis to proliferation. These results support the hypothesis of “Cell Selective Proliferation“, which was raised by authors previously in a study on human large bowel carcinoma.     

桂木黄素抑制肿瘤细胞增殖的作用

日本药学会第122次年会于2002年3月26～28日在日本千叶市召开。现对本次年会中有关天然药物方面的研究文献摘要予以介绍,供国内研究人员参考。     

大肠癌组织中Survivin表达与血管生成、细胞增殖的关系

目的　探讨大肠癌组织中Survivin表达与血管生成、细胞增殖的关系。方法　采用原位杂交方法和免疫组织化学方法 ,对 46例大肠癌、2 2例大肠腺瘤和 10例大肠正常组织进行SurvivinmRNA和PCNA检测 ,并计数微血管密度 (MVD)。结果　大肠癌组织中SurvivinmRNA、PCNA指数和MVD均显著高于大肠腺瘤和大肠正常组织 (P <0 .0 5 )。SurvivinmRNA表达阳性组中 ,MVD和PCNA指数均明显高于SurvivinmRNA阴性组 (P <0 .0 5 )。结论　Survivin在大肠癌组织中表达上调 ,并与血管生成和细胞增殖关系密切 ,提示Survivin对大肠癌的发生发展起重要作用     

维甲酸和18pβ-甘草次酸联合抗人肺癌细胞增殖和侵袭作用的研究

目的　探讨全反式维甲酸和 18β 甘草次酸对高转移人肺癌细胞 (PGCL3 )增殖抑制和抗侵袭的作用及其联合作用。方法　维甲酸和甘草次酸处理PGCL3细胞 ,用细胞增殖抑制试验、软琼脂集落形成试验、对重建基底膜胶的侵袭试验、趋化运动试验和对层粘连蛋白的粘附试验以及组织蛋白酶B活性测定 ,观察细胞增殖和侵袭能力的变化。结果　维甲酸和甘草次酸可降低PGCL3细胞增殖能力 ,并呈剂量依赖性 ,IC50 分别为 12 .5 8μmol/L和 14 5 .3 μmol/L ;5 .0 μmol/L维甲酸、2 5 μmol/L和 5 0 μmol/L甘草次酸能抑制PG CL3细胞的侵袭能力 (P <0 .0 1和P <0 .0 0 1) ,且有剂量依赖性。 5 .0 μmol/L维甲酸和 2 5 μmol/L甘草次酸联合作用对细胞侵袭抑制率大于两药单独作用之和 ,呈协同作用。抗侵袭作用机理的分析结果显示上述各浓度的甘草次酸和 10 μmol/L维甲酸对细胞的运动、粘附、组织蛋白酶B分泌均有显著抑制作用 (P <0 .0 0 1) ,上述各浓度甘草次酸对软琼脂集落形成率有明显抑制作用 (P <0 .0 0 1)。结论　维甲酸和 18β 甘草次酸有抗PGCL3人肺癌细胞增殖和侵袭能力的作用 ,两药有协同抗侵袭作用 ,维甲酸和甘草次酸抗侵袭机理不是对侵袭过程中某一环节的阻断 ,而是对侵袭的各个基本环节都有抑制作用。     

肝细胞增殖与肝癌发生研究进展

肝癌的发生与肝细胞的凋亡和增殖调节失控有关.近年来的研究显示,肝癌的发生与肝细胞的增殖活性增强关系更大,肝细胞增殖活性的持续升高成为各种原因导致肝脏损害并最终发生肝癌的重要危险因素之一.对慢性肝病患者,肝组织细胞增殖情况的分析有助于肝癌高危人群的发现.