BRONCHIAL SECRETIONS--PHYSICAL AND CHEMICAL STUDIES

支气管分泌物——物理和化学研究

• 批准号: 2217192
• 负责人: Mary C Rose
• 金额: $ 23.86万
• 依托单位: CHILDREN'S NATIONAL MEDICAL CENTER
• 依托单位国家: 美国
• 财政年份: 1984
• 资助国家: 美国
• 起止时间: 1984-03-01 至 1997-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2217192
• 关键词: BRONCHIAL; SECRETIONS; PHYSICAL; CHEMICAL; STUDIES

Mucin glycoproteins (mucins), the major components of the mucosal layer that protects and lubricates mammalian airways, are secreted by epithelial cells lining the lumen and submucosal glands. These cells and glands exhibit hyperplasia in chronic obstructive pulmonary diseases. Little is known about the mechanism or factors initiating or regulating metaplasia and hyperplasia, although it has recently been proposed that initiation of transcription of mucin protein genes by serous cells in rat airways is a primary event leading to goblet and mucous cell metaplasia and hypersecretion (1). Current evidence indicates that several mucin genes are expressed both in the airways and intestine. We speculate that the specific mucin proteins are more highly expressed in airway diseases (perhaps by specific airway cells) and that different members of the airway mucin protein gene family provide unique substrates for specific glycosyltransferases. The long term objective of our research program is to elucidate the role of airway mucins in health and in diseases. We have recently identified and characterized a cDNA clone that encodes TBM, a human tracheobronchial mucin that appears to be airway-specific. The specific aims of this proposal are: [1] To identify and characterize full length cDNA clones encoding TBM and to delineate similarities and differences to other mucins as such information becomes available. [2] To elucidate the cell and tissue specificity of mucin genes by in situ hybridization and Northern blot analysis and determine whether the expression of specific mucin genes is affected in airway diseases. [3] To isolate and characterize genomic DNA for TBM. The cDNA clone that encodes for TBM will be used to probe genomic libraries. TBM genomic clones will be characterized by chromosomal location, restriction mapping, S1 mapping, and by sequence analysis of the exon/intron boundaries. [4] To investigate expression and regulation of the TBM gene. We will determine the transcriptional activity of the TBM gene. Should it prove transcriptionally active, the promoter sequences of the genomic clones identified in aim [3] will be studied for regulatory elements using promoter deletion constructs.

粘蛋白糖蛋白（粘蛋白），粘膜的主要成分 保护和润滑的哺乳动物气道由 腔内和粘膜粘膜内壁的上皮细胞。 这些细胞 腺体在慢性阻塞性肺中表现出增生 疾病。 关于启动的机制或因素知之甚少 调节化生和增生，尽管最近已经 提出，通过 大鼠气道中的浆液细胞是导致酒杯和 粘液细胞化生和过度分泌（1）。 当前的证据 表明多个粘蛋白基因在气道和 肠。 我们推测特定的粘蛋白蛋白更多 在气道疾病中高度表达（也许是由特定气道细胞） 以及气道粘蛋白蛋白基因家族的不同成员 为特定的糖基转移酶提供独特的底物。 我们研究计划的长期目标是阐明角色 健康和疾病中的气道粘蛋白。 我们最近确定了 并表征了编码人类TBM的cDNA克隆 气管粘蛋白似乎特定于气道。 具体 该建议的目的是：[1]识别和表征全长 编码TBM并描述相似性和差异的cDNA克隆 对于其他粘蛋白，此类信息可用。 [2]阐明 粘蛋白基因的细胞和组织特异性通过原位杂交 和北印迹分析，并确定是否表达 特异性粘蛋白基因在气道疾病中受到影响。 [3]分离和 表征TBM的基因组DNA。 编码TBM的cDNA克隆 将用于探测基因组文库。 TBM基因组克隆将是 以染色体位置，限制映射，S1映射为特征， 并通过外显子/内含子边界的序列分析。 [4]到 研究TBM基因的表达和调节。 我们将 确定TBM基因的转录活性。 应该证明 转录活性，基因组克隆的启动子序列 在AIM [3]中确定的使用 启动子删除结构。