STRUCTURE AND FUNCTION OF NON BASEMENT MEMBRANE LAMININS

非基底膜层粘连蛋白的结构和功能

• 批准号: 6499449
• 负责人: WILLIAM J BRUNKEN
• 金额: $ 37.57万
• 依托单位: TUFTS UNIVERSITY BOSTON
• 依托单位国家: 美国
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-02-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6499449
• 关键词: Macaca mulatta; animal tissue; baboons; cow; developmental neurobiology; genetically modified animals; integrins; laboratory mouse; laboratory rat; laminin; mucopolysaccharides; protein structure function; proteoglycan; tissue /cell culture

A novel laminin subunit chain, gamma3, has been recently identified. Biochemical studies of gamma3 containing laminins show that gamma3 can associate with at least alpha2, alpha4, beta1, and beta2 subunit chains. The tissue distribution of gamma3 shows it to be present in regions not containing ultrastructurally defined basement membranes. These regions include the brain matrix and the apical surface of ciliated epithelial cells. The following specific aims describe proposed intentions to test the hypothesis that gamma3 containing laminins form a unique matrix at these non-basement membrane sites, the function of which is to stabilize the cytoskeletal arrangements required for the assembly and stabilization of cilia, and to also provide a distensible matrix stabilizing the structure of the CNS. To test this hypothesis specific aims are proposed: (1) Carefully describe the anatomical distribution of gamma3 and other selected laminin chains, as well as of known matrix macromolecules and receptors in the brain and at ciliated epithelial surfaces during development and in the adult mouse; (2) Determine the molecular composition of gamma3 containing laminins in the brain and at ciliated epithelial surfaces. Chemical quantities of the appropriate laminins will be produced in cell culture and purified. (3) Potential interactions between molecules which colocalized spatially and temporally will be tested in vitro. Binding to potential receptors will be determined by cell binding studies. (4) A gamma3 null mouse will be generated by homologous recombination and the phenotype characterized. We will cross the gamma3 and beta2 heterozygous mice to produce the double KO. It is likely that these studies will provide the foundations for further study of a novel extracellular matrix. It is also possible that these studies will provide novel insights into the pathophysiology of neurodegenerative diseases and infertility.

最近发现了一种新的层粘连蛋白亚基链，gamma3。 生化 对含有层粘连蛋白的 gamma3 的研究表明，gamma3 可以与 at 至少有 alpha2、alpha4、beta1 和 beta2 亚基链。 γ3的组织分布 显示它存在于不包含超微结构定义的基底的区域 膜。这些区域包括脑基质和顶面 纤毛上皮细胞。以下具体目标描述了提议的 目的是检验含有层粘连蛋白的 gamma3 形成独特的假设 这些非基底膜位点的基质，其功能是 稳定组装所需的细胞骨架排列， 纤毛的稳定，并提供可扩张的基质稳定 中枢神经系统的结构。为了检验这一假设，提出了具体目标： (1) 仔细描述gamma3和其他选定的解剖分布 层粘连蛋白链，以及已知的基质大分子和受体 发育期间和成人的大脑和纤毛上皮表面 老鼠; (2) 测定含层粘连蛋白γ3的分子组成 大脑和纤毛上皮表面。适当的化学用量 层粘连蛋白将在细胞培养物中产生并纯化。 (3) 潜在的相互作用 将测试在空间和时间上共定位的分子之间 体外。与潜在受体的结合将通过细胞结合研究来确定。 (4)通过同源重组产生gamma3 null小鼠并 所表征的表型。我们将杂交 gamma3 和 beta2 杂合子 小鼠产生双 KO。这些研究很可能会提供 为进一步研究新型细胞外基质奠定了基础。也是可以的 这些研究将为病理生理学提供新的见解 神经退行性疾病和不孕症。