ALPHA GAMMA INTEGRINS IN ORAL CANCER

口腔癌中的 ALPHA GAMMA 整合素

• 批准号: 6336498
• 负责人: ROBERT PYTELA
• 金额: $ 10.48万
• 依托单位: UNIVERSITY OF CALIFORNIA, SAN FRANCISCO
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-21 至 2000-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6336498
• 关键词: cytokine; endopeptidases; extracellular matrix; gene expression; growth factor; histopathology; human tissue; immunologic assay /test; integrins; neoplastic growth; neoplastic process; oral mucosa; oral pharyngeal neoplasm; protein structure function; squamous cell carcinoma; tissue /cell culture; transfection

The invasive growth of carcinomas depends not only on soluble growth factors and activation of oncogenes. but also on altered interactions with the extracellular matrix that allow the tumor to spread. A family of cell surface receptors termed integrins, plays a central role in mediating cell responses to the extracellular matrix. Integrins interact with extracellular matrix proteins such as fibronectin, vitronectin, tenascin, collagen, and laminin and transmit signals that regulate gene expression, cell proliferation, survival. and morphology. In human oral cancer specimens, the expression of one major class of integrins, termed b 1 integrins, has been studied in some detail. The importance of another class of integrins termed av integrins, has only recently been recognized. Initial studies showed that at least three different av integrins are up-regulated in different cellular components of squamous cell carcinomas (scc) derived from the oral mucosa. The alpha-v-beta-6 integrin is neo-expressed in carcinoma cells, alphavbeta6 is strongly expressed in tumor-associated stromal cells, and alphavbeta3 is strongly expressed in blood vessels that support the growth and survival of the tumor. Thus, it is conceivable that inhibitors of av integrins could have potent effects on oral cancer growth and survival. It is proposed to extend the initial studies on integrin expression in oral carcinoma by analyzing a larger number of specimen from normal, hyperplastic and malignant oral mucosa, which will be processed and catalogued in conjunction with the oral cancer Tissue and Histopathology Core. The goal of this investigation is to confirm the correlation between oral cancer progression and av integrin expression and to evaluate the potential utility of av integrins as histopathological markers of oral cancer progression and prognosis. Furthermore, factors that regulate alpha-v-beta-6 expression in cultured SCC cells will be analyzed, and the hypothesis that alpha-v-beta-6 expression may be induced by stroma-derived signals will be tested. To assess the function of av integrins in oral carcinoma, we will test the effects of av-blocking antibodies on the growth and invasion of SCC cells in different in vitro models and compare the behavior of b6- negative SCC cell lines will be compared with that of their transfected counterparts overexpressing alpha-v-beta-6. Finally, the hypothesis that av integrins are involved in regulating the expression of proteases, growth factors, and cytokines in SCC cells will be tested. These studies will provide new insights into the role of cell matrix interactions in oral cancer, and will provide the basis for developing novel therapeutics that interfere with oral cancer growth and invasion by interfering with essential cell matrix interaction of SCC cells.

癌症的侵袭性生长不仅取决于可溶性生长 因素和癌基因的激活。而且还改变了互动 与允许肿瘤扩散的细胞外基质。一个家庭 称为整合素的细胞表面受体，在 介导细胞对细胞外基质的反应。整合素相互作用 与细胞外基质蛋白如纤连蛋白、玻连蛋白、 腱蛋白、胶原蛋白和层粘连蛋白并传递调节基因的信号 表达、细胞增殖、存活。和形态。在人类口腔中 癌症标本中，一类主要整合素的表达，称为 b 1 整合素，已被详细研究。的重要性 另一类整合素称为 av 整合素，最近才被 认可。初步研究表明至少三种不同的AV 整合素在鳞状细胞的不同细胞成分中上调 源自口腔粘膜的细胞癌（scc）。 α-V-β-6 整合素在癌细胞中新表达，αvβ6 强烈表达 在肿瘤相关基质细胞中表达，并且 alphavbeta3 强烈 在支持生长和生存的血管中表达 瘤。因此，可以想象，av 整合素抑制剂可以 对口腔癌的生长和生存有显着影响。 建议扩展整合素表达的初步研究 口腔癌通过分析大量正常样本， 增生和恶性的口腔粘膜，将被处理和 与口腔癌组织和组织病理学联合编目 核。本次调查的目的是确认相关性 口腔癌进展与av整合素表达之间的关系 评估 av 整合素作为组织病理学的潜在效用 口腔癌进展和预后的标志物。 此外，调节培养物中α-v-β-6表达的因子 将分析 SCC 细胞，并假设 alpha-v-beta-6 将测试可能由基质来源的信号诱导的表达。 到 评估 av 整合素在口腔癌中的功能，我们将测试 AV阻断抗体对鳞状细胞癌生长和侵袭的影响 不同体外模型中的细胞并比较 b6- 的行为 阴性 SCC 细胞系将​​与其转染的细胞系进行比较 对应物过度表达 alpha-v-beta-6。 最后提出假设 av 整合素参与调节表达 将测试鳞状细胞癌细胞中的蛋白酶、生长因子和细胞因子。 这些研究将为细胞基质的作用提供新的见解 口腔癌中的相互作用，并将为开发提供基础 干扰口腔癌生长和侵袭的新疗法 通过干扰鳞状细胞癌细胞的基本细胞基质相互作用。