王瓜根抗癌糖蛋白的生理生化特征及其对肺腺癌细胞杀伤作用初步研究

经电泳分析,王瓜根活性蛋白可分为两种:其一是酸性蛋白,具细胞毒作用,等电点测定 P~I 为3.2,PAGE 电泳测定分子量为6.76×10~4道尔顿;其二是碱性蛋白,等电点为9.3,PAGE 电泳测定分子量为1.58×10~4道尔顿;微具细胞毒作用。王瓜根活性蛋白属糖蛋白,经纸层析和薄层硅胶 H 层析证实含半乳糖和木糖。扫描电镜观察和光镜连续观察,显示酸性蛋白对肺腺癌细胞的体外培齐有杀伤作用,当培养液含120μg/ml 时杀伤率达58%,对正常肺细胞作用弱;碱性蛋白对肺腺癌细胞杀伤作用较差,在同样剂量时只有47.6%杀伤率。新鲜王瓜根原汁有很强的杀伤肺腺癌细胞作用,剂量在26g/ml 时,杀伤率达60%;当提高到105g/ml 时,杀伤率达74%。试验结果提示:王瓜根活性抗癌物质,除指三萜—葫芦素之外,可能还存在另一种活性物质。这种活性抗癌物质对肺腺癌细胞表面微绒毛无作用,经处理24小时后,癌细胞开始变形,表现为不同程度内陷,32小时癌细胞膜开始溶解,48小时癌细胞溶成团块。     

云锡矿工肺癌的时间序列预测与分析

本文采用时间序列方法中的 AR 模型和非平稳时间序模型对云锡老矿各年代下井矿工的肺癌死亡进行了预测,得到了1936～1995年期间各组矿工肺癌死亡的预测情况,并在此基础上进行了分析,对解放后所采取的防护、防治措施的奏效程度进行了评价,对云锡矿工肺癌的发病趋势作了宏观和微观的结论,是一篇综合性的论文报告。     

血管生成抑制剂与肺癌治疗的研究进展

目的:探讨血管生成抑制剂治疗肺癌的研究进展.方法:收集该类药物的国内外近期资料加以综合归纳.结果:血管生成抑制剂治疗肺癌方法可行,前景诱人.结论:随着血管生成抑制剂的不断开发和研究,对于肺癌这一血管增生明显的肿瘤,深入研究抗血管治疗具有重要意义.     

中华大蟾蜍肺毛细血管的扫描电镜观察

用扫描电镜观察了ＡＢＳ丁酮溶液灌注的中华大蟾蜍肺毛细胞管构筑情况，其肺壁被内面的施工网状隔膜分隔成许多小室－肺泡；在网状隔膜，肺泡壁上均有丰富的毛细血管，且相互吻合成单层密集网；肺泡毛细血管网眼多，由五边形的毛细管环构成，毛细血管直径９．５３－１６．７３μｍ，网眼孔径９１．７－２５．１８μｍ；在毛细血管铸型上有明显的内皮细胞核的压迹。     

HAb18G/CD147-mediated calcium mobilization and hepatoma metastasis require both C-terminal and N-terminal domains

HAb18G/CD147 is a heavily glycosylated protein containing two immunoglobulin superfamily domains. Our previous studies have indicated that overexpression of HAb18G/CD147 enhances metastatic potentials in human hepatoma cells by disrupting the regulation of store-operated Ca²⁺ entry by nitric oxide (NO)/cGMP. In the present study, we investigated the structure-function of HAb18G/CD147 by transfecting truncated HAb18G/CD147 fragments into human 7721 hepatoma cells. The inhibitory effect of HAb18G/CD147 on 8-bromo-cGMP-regulated thapsigargin-induced Ca²⁺ entry was reversed by the expression of either C or N terminus truncated HAb18G/CD147 in T7721C and T7721N cells, respectively. The potential effect of HAb18G/CD147 on metastatic potentials, both adhesion and invasion capacities, of hepatoma cells was abolished in T7721C cells, but not affected in T7721N cells. Release and activation of matrix metalloproteinases (MMPs), MMP-2 and MMP-9, were found to be enhanced by the expression of HAb18G/CD147, and this effect was abolished by both truncations. Thapsigargin significantly enhanced release and activation of MMPs (MMP-2 and MMP-9) in non-transfected 7721 cells, and this effect was negatively regulated by SNAP. However, no effects of thapsigargin or SNAP were observed in T7721 cells, and expression of HAb18G/CD147 enhanced secretion and activation of MMPs at a stable and high level. Taken together, these results suggest that both ectodomain and intracellular domains of HAb18G/CD147 are required to mediate the effect of HAb18G/CD147 on the secretion and activation of MMPs and metastasis-related processes in human hepatoma cells by disrupting the regulation of NO/cGMP-sensitive intracellular Ca²⁺ mobilization although each domain may play different roles.Received 1 April 2004; received after revision 15 June 2004; accepted 22 June 2004     

The Ras family of GTPases in cancer cell invasion

The ability of tumoral cells to invade surrounding tissues is a prerequisite for metastasis. This is the most life-threatening event of tumor progression, and so research is intensely focused on elucidating the mechanisms responsible for invasion and metastasis. The Ras superfamily of GTPases comprises several subfamilies of small GTP-binding proteins whose functions include the control of proliferation, differentiation, and apoptosis, as well as cytoskeleton organization. The development of metastasis is a multistep process that requires coordinated activation of proliferation, motility, changes in normal cell-to-cell and cell-to-substrate contacts, degradation of extracellular matrix, inhibition of apoptosis, and adaptation to an inappropriate tissue environment. Several members of the Ras superfamily of proteins have been implicated in these processes. The present review summarizes the current knowledge in this field.     

MVC方案治疗30例ⅢB—Ⅳ期肺腺癌临床观察

丝裂霉素、长春碱酰胺、顺铂（ＭＶＰ）方案是目前非小细胞肺癌化疗最常用方案之一，但它毒性大。卡铂和顺铂具有不同毒性，我们观察了用卡铂代替顺铂的ＭＶＣ方案治疗肺腺癌的近期疗效，应用方案为：丝裂霉素（ＭＭＣ）６～８ｍｇ／ｍ２ｉｖｄｌ、长春碱酰胺（ＶＤＳ）３ｍｇ／ｍ２ｉｖｄｌ，ｄ８和卡铂（ＣＢＰ）３００ｍｇ／ｍ２ｉｖｄｒｉｐｄｌ。３０例ⅢＢ～Ⅳ期肺腺癌（男性１０例，女性２０例，ⅢＢ期２０例，Ⅳ期１０例）的总有效率为４５％，ⅢＢ期有效率为５５％，Ⅳ期有效率为４０％，其中完全缓解３例（占１０％），部分缓解１２例（占４０％）。副反应轻，主要毒性反应为骨髓抑制，Ⅲ、Ⅳ级白细胞减少分别为１０％和３３％；Ⅲ、Ⅵ级血小板减少均为３３％；Ⅲ级血红蛋白减少３３％；未见Ⅳ级血红蛋白减少，未见肾毒性，其它副反应多数为Ⅰ～Ⅱ级，发生率也低。ＭＶＣ方案对肺腺癌特别是ⅢＢ肺腺癌有较好疗效，毒性小，无须水化，使用方便，患者依从性好，可在门诊使用，可作首选方案之一代替ＭＶＰ方案治疗肺腺癌     

Blocking of lectin-like adhesion molecules on pulmonary cells inhibits lung sarcoma L-1 colonization in BALB/c-mice

Summary Adhesion and inhibition experiments with pulmonary cells of BALB/c-mouse origin and syngeneic sarcoma L-1 cells indicated that L-fucose specific lectin-like adhesion molecules, presumably situated on pulmonary cell surfaces are (at least partly) responsible for the specificity of this cell-cell interaction. Addition of specific sugars and glycoconjugates (L-fucose and fucoidan, respectively) to the incubation medium evidently inhibited the adhesion process as quantified using radiolabelled tumor cells. Unspecific carbohydrates (e.g. D-galactose) did not affect the cellular interaction. In vivo, repeated administration of fucoidan (but not of unspecific glycoconjugates) significantly inhibited the settling of metastatic sarcoma L-1 cells in the lungs of BALB/c-mice. Therefore, when lectin-like adhesion molecules on pulmonary cells were blocked with competitive glycoconjugates, tumor cell colonization of the lung could be significantly inhibited.     

诺维本联合MMC、PDD治疗肺部肿瘤32例疗效观察

目的:探讨诺维本(NVB)联合MMC、PDD治疗非小细胞肺癌的疗效.方法:第1 d,8 d,15 d静注NVB40 mg;并于第1 d静注MMC 10 mg,第15 d静注PDD 60 mg;21 d为一疗程.以WHO(1981)统一评定标准评价疗效及毒副作用.结果:总有效率(PR+CR)53.1%,其中初治59.1%,复治40.0%;鳞癌62.5%,腺癌52.6%,腺鳞癌40.0%,Ⅲa期66.7%,Ⅲb期66.7%,Ⅳ期35.7%.毒副反应主要表现为白细胞下降.结论:NVB与MMC、PDD有协同作用,可以提高治疗肺部肿瘤的疗效,且毒副反应可以耐受,有推广应用价值.     

乙酰肝素酶与甲状腺乳头状癌淋巴结转移的相关性研究

【目的】通过研究乙酰肝素酶(HPA)含量与微淋巴管密度的关系,探讨HPA在甲状腺乳头状癌淋巴结转移中的作用。【方法】采用Envision免疫组织化学两步法检测150例甲状腺乳头状癌和200例结节性甲状腺肿患者乙酰肝素酶、D2-40的表达情况,计算乙酰肝素酶平均光密度值与D2-40阳性标记的微淋巴管密度,分析乙酰肝素酶含量与微淋巴管密度间的关系,同时与结节性甲状腺肿患者微淋巴管密度和乙酰肝素酶含量分别进行比较。【结果】甲状腺乳头状癌患者微淋巴管密度和乙酰肝素酶含量明显高于结节性甲状腺肿患者(P0.01),癌组织乙酰肝素酶含量与微淋巴管密度呈正相关关系(P0.01)。【结论】甲状腺乳头状癌患者乙酰肝素酶与微淋巴管形成有密切关系,乙酰肝素酶可作为其临床疗效判断和新药研发的参考指标。