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.

一个新的层粘连蛋白亚基链，γ 3，最近已被确定。 生化 对含有γ 3的层粘连蛋白的研究表明，γ 3可以与AT结合， 至少α 2、α 4、β 1和β 2亚基链。γ 3的组织分布 表明它存在于不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拟议的 目的是检验含有γ 3的层粘连蛋白形成独特的 基质在这些非基底膜网站，其功能是 稳定组装所需的细胞骨架排列， 纤毛的稳定，并且还提供可膨胀的基质稳定 CNS的结构。为了检验这一假设，提出了具体目标： (1)仔细描述γ 3和其他选定的 层粘连蛋白链，以及已知的基质大分子和受体， 在发育过程中和成年期， 小鼠;（2）确定小鼠中含有γ 3的层粘连蛋白的分子组成。 脑和纤毛上皮表面。适当的化学量 层粘连蛋白将在细胞培养物中产生并纯化。(3)潜在相互作用 将测试在空间和时间上共定位的分子之间的关系， 体外与潜在受体的结合将 通过细胞结合研究确定。 (4)将通过同源重组产生γ 3缺失小鼠， 表型特征。我们将γ 3和β 2杂合子 小鼠产生双KO。这些研究可能会提供 为进一步研究新型细胞外基质奠定了基础。也可以 这些研究将提供新的见解， 神经退行性疾病和不育症。