E-钙粘附素、基质金属蛋白酶与肿瘤的侵袭转移

肿瘤侵袭与转移是指恶性肿瘤细胞脱离原发部位 ,通过各种转移方式到达继发组织或器官后得以继续增殖生长 ,形成与原发肿瘤性质相同的继发肿瘤的过程。肿瘤的侵袭和转移是恶性肿瘤的基本生物学特征 ,是临床上绝大多数肿瘤患者死亡的主要原因之一。研究表明 ,肿瘤的侵袭及转移是一个极其复杂的过程 ,大致包括 :①肿瘤细胞从原发灶脱落 ;②侵犯周围组织 ;③进入循环系统在远隔部位突破毛细管结构 ,形成新的转移灶[1] 。近年来研究表明 ,细胞表面粘附分子的变化与肿瘤侵袭和转移关系密切。当肿瘤细胞表面的细胞粘附分子如E -钙粘附素 (E Cadhe…     

钙粘蛋白与乳腺癌

粘附分子在癌细胞的侵袭和转移中有重要作用。近年来 ,许多国内外学者深入研究了粘附分子与肿瘤侵袭和转移的关系 ,已有不少关于这方面的报道。钙粘蛋白 (CadherinCD)是细胞粘附分子 (Cellularadhesionmolecules ,CAMs)的一种 ,本文着重讨论钙粘蛋白与乳腺癌的侵袭、转移 ,相互关系及在乳腺癌中的表达。1　钙粘蛋白与乳腺癌钙粘蛋白是一种表达于不同组织的依赖Ca2 + 的同种亲和性细胞间粘附分子 ,为细胞间粘附分子家族的主要成员 ,具有介导同种亲和性的细胞 -细胞间粘附及参与建立和维持细胞间连接的作用。在建立和维持细胞群体和细胞极…     

细胞粘附分子CD44与乳腺癌

粘附分子在癌细胞的侵袭和转移中有重要作用。近年来 ,国内外许多学者深入研究了粘附分子与肿瘤侵袭和转移的关系 ,报道较多。透明质酸受体类 (CD4 4 )是细胞粘附分子(Cellularadhesionmolecules,CAMs)的一种 ,本文着重讨论粘附分子CD4 4与乳腺癌的侵袭、转移 ,相互关系及在乳腺癌中的表达。CD4 4又称Hermes抗原、pgq - 1、ECMR -Ⅲ ,为分布极为广泛的细胞表面跨膜糖蛋白 ,主要参与细胞与间质之间特异性粘连过程。CD4 4基因是粘附分子家庭成员之一 ,其编码的跨膜糖蛋白为细胞外基质透明质酸的受体 ,参与体内多种正常生理功能。1　CD…     

粘附分子ICAM-1、E-Cadherin、CD44v6与肿瘤侵袭和转移

肿瘤的侵袭和转移是患者死亡的最主要原因。它是一个复杂的多因素、多步骤的病理生理过程。近年来粘附分子 ICAM- 1、E- Cadhcrin、CD44v6与肿瘤的侵袭转移的关系正成为研究的重点。笔者对该 3种粘附分子与肿瘤、特别是膀胱癌的侵袭转移的关系作一综述 ,展望它们作为临床指标为 TCC的早期预防、诊断和治疗提供依据     

纤维粘连蛋白与肿瘤的侵袭转移

纤维粘连蛋白 (Ｆｉｂｒｏｎｅｃｔｉｎ ,ＦＮ)为细胞产生的大分子糖蛋白 ,是细胞外基质中重要的细胞粘附分子 ,不仅在支持、连接和维持组织形态方面起重要作用 ,而且具有调节细胞的粘附、生长、分化 ,促进细胞迁移、增殖以及离子交换和信息传递等功能。在肿瘤的侵袭转移过程中 ,肿瘤细胞不可避免的要与细胞外基质多次发生作用 ,其中ＦＮ的粘附、介导始终起着重要作用 ,成为近年来肿瘤侵袭转移的研究热点之一。本文将就目前研究状况 ,对ＦＮ的分子结构、合成及其与肿瘤侵袭转移的关系进行综述。1　ＦＮ的分子结构ＦＮ是一组由两条相似的肽链…     

细胞粘附分子与肿瘤侵袭转移的关系

细胞粘附分子 (Cell adhesion molecules,CAM)是众多介导细胞间或细胞与细胞外基质 (extra cellularm atrix,ECM)间相互接触和结合分子的统称。粘附分子以受体—配体结合的形式发挥作用 ,使细胞与细胞间、细胞与基质间或细胞—基质—细胞间发生粘附 ,参与细胞的识别 ,信号转导 ,活化增殖与分化 ,以及细胞的伸展与转移 ,是免疫应答、肿瘤转移等一系列重要生理和病理过程的分子基础 [1 ]。细胞粘附分子 (CAM)可介导肿瘤细胞与细胞外基质 (ECM)、血管内皮细胞、实质器官细胞或与其它的肿瘤细胞之间的相互作用 ,因此在肿瘤侵袭转移中具有…     

CD44表达与消化系肿瘤转移和预后的关系

肿瘤侵袭转移为恶性肿瘤最重要的生物学行为 ,肿瘤细胞粘附分子、蛋白水解酶降解基质、肿瘤细胞移动和新生血管生成等为肿瘤侵袭转移的重要环节 ,其中以细胞粘附分子ＣＤ44的研究倍受重视 ,其表达异常与肿瘤的发生、转移密切相关 ,可作为肿瘤转移的标志物和治疗靶点[1 - 3] 。本文就ＣＤ44的结构、功能及其对消化系肿瘤转移和预后评估方面的价值作一简要综述。1　ＣＤ44的基本结构和功能ＣＤ44分子为一种多功能的跨膜透明质酸受体 ,主要负责细胞 -细胞、细胞 -基质之间的粘附作用 ,人ＣＤ44编码基因位于第 1 1号染色体的短臂上[9] ,全长 50…     

肝细胞癌侵袭转移的分子机理

恶性肝细胞肿瘤难以治愈的根本原因是肿瘤细胞的扩散和转移 ,涉及肿瘤细胞自身与宿主之间错综复杂的关系 ,并受到多种基因的调控。“转移”包括了细胞粘附、运动、增殖 ,细胞外基质降解 ,机体免疫与肿瘤血管生成等环节。干预上述任何一个环节 ,都有可能改变肝癌转移的过程。为此 ,肝癌复发转移是一个多环节、多阶段的过程 [1] 。以下笔者仅就与肝细胞癌侵袭转移相关的一些基因标志物的研究近况作一介绍。1　粘附分子在肝癌侵袭转移中的作用粘附分子家庭包括以下几种 :选择素家族、钙粘蛋白家庭、整合素家庭、免疫球蛋白超家庭、CD4 4、CD5…     

CD_(44)与肿瘤关系的研究进展

<正> 恶性肿瘤具有在多种因素介导下侵袭血管和转移的特性。瘤细胞在侵袭和转移过程中,从原发瘤体分离,穿越细胞与细胞之间的基质、血管内皮及皮下基底膜,最后进入转移灶。因此调节细胞和细胞、细胞和基质之间相互作用的因素起关键作用。粘附分子正是这样一类介导细胞与细胞、细胞与细胞外基质间粘附作用的膜表面糖蛋白,它们在肿瘤的发生和     

喉肿瘤浸泣转移相关标志物的研究现状

浸润转移是恶性肿瘤的本质特征,也是肿瘤患者死亡的主要原因,近年,学者们在探索肿瘤浸润转移机制的过程中,发现了许多与之有关的细胞分子和基因,其中一些与喉癌的浸润转移关系较为密切,包括粘附分子类、蛋白溶解酶、基底膜成分、增殖细胞核抗原（ＰＣＮＡ）以及浸润转移相关基因ｎｍ２３、ｐ５３等。现按上述分类对喉癌浸泣转移相关标志物及其研究现状作一综述。     

鉴别簇44与乳腺癌浸润和转移的研究进展

鉴别簇44(CD44)是一类重要的尚未归类的黏附分子,广泛分布于细胞表面,是细胞与细胞、细胞与细胞外基质相互识别和作用的分子基础。CD44又是一种特异性淋巴细胞归巢受体,在多种高转移性肿瘤细胞上表达,CD44阳性的瘤细胞可能因获得类似淋巴细胞成分的伪装,而容易进入淋巴结形成转移灶。CD44基因与许多肿瘤的浸润和转移有关,其在乳腺癌细胞表面的异常表达,与乳腺癌的浸润和转移亦有着密切的关系。     

Relations of proliferative activities of gastric carcinoma cells to lymphatic involvement, venous invasion and prognosis

Background This study was to evaluate bivariate bromodeoxyuridine(BrdUrd)/DNA flow cytometric analysis in detection of gastric carcinoma and to study the relations of cellular BrdUrd labeling indices (LI), G2/M-phase fraction(G2/MPF) and DNA ploidy pattern to lymphatic involvement, venous invasion and prognosis.Methods Fresh tumor samples from 60 patients with gastric carcinoma were analyzed by bivariate BrdUrd/DNA flow cytometry. The results were correlated with lymphatic vessel invasion, lymphatic node metastasis, the number of matastatic lymphatic nodes, and venous invasion. Propidium iodide (PI) was used as a fluorescent probe for total cellular DNA, and a monoclonal antibody against BrdUrd was used as a probe for BrdUrd incorporated into DNA. Fluorescent-labeled goat anti-mouse antibody was used as a second antibody. S-phase fractions were measured by in vitro BrdUrd labeling, and DNA ploidy and G2/MPF were also measured. Comparison of survival was performed with the log-rank test, the Chi-square test for qualitative data, and Student’s t test for quantu data. Results BrdUrd LI and G2/MPF values were significantly higher in tumors with lymphatic vessel invasion than in those without invasion respectively (P&lt;0.01); the patients who had tumors with lymphatic vessel invasion showed a significantly poor prognosis (P&lt;0.01). Both BrdUrd LI and G2/MPF values were significantly higher in tumors with lymphatic node metastasis than in those without metastasis (P&lt;0.01). A statistical significant difference was noted in the 5-year survival rates between the patients with lymph node metastasis and those without metastasis. Compared with diploid carcinoma, the incidence of lymph node metastasis was significantly higher in aneuploid carcinoma (P&lt;0.05), and the patients with aneuploid carcinoma showed a significantly poor prognosis (P&lt;0.05). BrdUrd LI was significantly higher in patients with more than 5 metastatic lymph nodes than those with 1-4 metastatic lymph nodes (P&lt;0.05) and those without metastasis (P&lt;0.01). G2/MPF values in those patients either with more than 5 metastatic lymph nodes or 1-4 metastatic lymph nodes were higher than those without metastasis (P&lt;0.01 and P&lt;0.05). A statistical significance was seen in the 5-year survival rates among the patients with no metastatic lymph node, 1-4 metastatic nodes and more than 5 metastatic nodes (P&lt;0.01). G2/MPF values were significantly higher in patients with venous invasion than in those without invasion (P&lt;0.01).Conclusions Positive correlations exist between cellular BrdUrd LI, G2/MPF with lymphatic involvement and prognosis, and DNA aneuploid with lymphatic involvement and prognosis. The same was true between G2/MPF value and venous invasion in gastric carcinoma.     

结肠癌肝转移的分子机制研究进展

结肠癌是一种常见恶性肿瘤,因结肠癌肝转移是结肠癌患者死亡的主要原因。该文从细胞外基质(ECM)的降解、细胞黏附性能的改变、肿瘤血管生成、肿瘤细胞循环内播散和免疫逃逸、肿瘤细胞在新的微环境重新生长等几方面分子事件进行了介绍,了解这些这些分子机制有助于结肠癌肝转移的治疗     

Osteopontin knockdown suppresses non-small cell lung cancer cell invasion and metastasis

Background Osteopontin (OPN) was identified as one of the leading genes that promote the metastasis of malignant tumor.However,the mechanism by which OPN mediates metastasis in non-small cell lung canc...     

上皮间质转化与肿瘤侵袭、转移

肿瘤转移是肿瘤发展的重要阶段,是多数恶性肿瘤患者的主要致死因素.上皮间质转化（transformation of epithelial mesenchymal,EMT）作为肿瘤发生转移的第一步,是一个动态的多基因、多步骤的生物学过程,与恶性肿瘤的侵袭、转移关系密切.研究EMT发生发展机制,寻找控制肿瘤侵袭、转移的有效途径或肿瘤治疗新靶点,是目前肿瘤研究的热点之一.该文仅就EMT、相关因子及信号转导通路与肿瘤侵袭、转移的关系作一综述.     

Relationship between invasion and metastasis of tumor cells.

This work was done to examine the relationship between invasion and metastasis of different types of tumor cells. Three kinds of tumor cells were studied: a mouse uterine cervix carcinoma (U14) with high metastatic potential; a human nasopharyngeal carcinoma (CNE-2Z) with high metastatic potential; and a human uterine cervix carcinoma (CC801) with low metastatic potential. CNE-2Z and CC801 were implanted subcutaneously in the footpads and subcapsularly in the testes of nude mice, respectively. U14 was implanted both in the footpads and subcapsularly in the testes of inbred 615-strain mice. With each of these animal models, the extent of tumor invasion could be divided into grades I-IV. The metastasis of tumor cells was found to depend upon: 1) the malignant characteristics of the tumor cells; 2) the degree of local invasion; 3) the presence of tumor cells in the lymphatic ducts and blood vessels; and 4) the organ specificity of metastatic development. Metastasis was most often found when invasion reached a high degree (grades III to IV).     

候选转移抑制基因（MTSS1）与肿瘤关系的研究进展

肿瘤转移抑制基因的表达产物——转移消失蛋白是一种肌动蛋白结合蛋白,广泛表达于多种组织,而在转移性肿瘤中,其表达缺失。,在细胞发生发展以及肿瘤的侵袭和转移中,MTSS1发挥着重要作用。着重从肿瘤转移抑制基因的结构、生物学功能以及其与肿瘤转移的关系做一综述。     

T淋巴瘤侵袭转移诱导因子1在甲状腺癌中的表达

目的探讨T淋巴瘤侵袭转移诱导因子l（Tlymphoma invasion and metastasis inducing factorl，Tiam 1）表达与甲状腺癌侵袭转移的关系。方法采用免疫组织化学S—P法检测Tiam 1在甲状腺癌及其淋巴结转移癌石蜡组织标本中表达。结果淋巴结转移癌组织中Tiam 1表达显著高于甲状腺癌原发灶中的表达（P〈0．05）；伴发转移的甲状腺癌组织比未发生转移的甲状腺癌组织Tiam 1表达明显增强（P〈0，05）；甲状腺髓样癌、未分化癌组织中Tiam1表达显著高于在乳头状癌、滤泡癌中的表达（P〈0．05）；高临床分期（ⅡI、IV期）甲状腺癌组织中Tiam 1表达明显高于其在低临床分期（I、Ⅱ期）中的表达（P〈0，05）。结论Tiam 1表达与甲状腺癌侵袭转移密切相关，提示Tiam 1在甲状腺癌侵袭转移中起重要作用。     

胃癌的浸润和转移与肿瘤侵袭部位肥大细胞的关系

８２例胃癌侵袭部位肥大细胞的分布情况观察结果表明：肿瘤侵袭部位肥大细胞数量与肿瘤组织学类型、粘液性质无关，但与浸润深度及局部淋巴结的有无转移有关。肿瘤侵袭部位肥大细胞数量越多，癌组织在胃壁浸润就越深，局部淋巴结内转移就越容易发生。提示，肿瘤侵袭部位肥大细胞在胃癌的浸润和转移中可能起一定的促进作用。     

癌细胞侵袭和淋巴道转移过程中血液变学的观察

Mouse transplantable hepatoma (H22) was used as an experimental model for lymphatic metastasis. The tumor cells were transplanted subcutaneously into right footpads of inbred 615-strain mice. The hemorheological changes during invasion and lymphatic metastasis in mice were observed. The results of histological examination showed that tumor invasion was divided into early, middle and late invasive stages, and the metastasis was divided into early, middle, late and final metastasis periods. Tumor invasion began 3 days after tumor transplantation, and the late stage of invasion was found at 9 days. Metastasis began 6 days after transplantation; at 19 days metastasis to lymph nodes in the right side reached grade IV. Metastasis to lymph nodes in the left side appeared 14 days after tumor transplantation. In the early and middle invasive stages only plasma viscosity increased significantly, while other hemorheological values were unchanged. The blood viscosity and aggregation of red blood cells decreased significantly after the metastatic late stage. The hematocrit of red blood cells began to decrease in the final stage of metastasis, and in the meantime, the rigidity of red blood cells began to increase, while plasma viscosity showed no changes after the late metastatic stage. The results and mechanism of hemorheological changes are discussed.