细胞外基质(ECM)重塑与慢性肺部疾病有关。然而,关于肺ECM特定年龄相关差异的信息目前有限.在这项研究中,我们的目的是识别和定位年龄相关的ECM差异在人类肺部使用综合转录组,蛋白质组学,和免疫组织化学分析。我们先前鉴定的肺的与年龄相关的基因表达特征被重新分析,将其限制为基于270名对照患者(37-80岁)的老化特征,并使用基因集富集分析集中于Matrisome核心基因集。为了验证蛋白质水平上与年龄相关的转录组差异,我们比较了与年龄相关的ECM基因(错误发现率,FDR<0.05),从9名对照患者(49-76岁)的肺组织蛋白质组学数据集中鉴定出年龄相关蛋白的概况(FDR<0.05)。广泛的免疫组织化学分析用于定位和半量化62例对照患者(18-82岁)的肺组织中与年龄相关的ECM差异。转录组和蛋白质组数据的比较分析确定了7种ECM蛋白在基因和蛋白质水平上均随年龄增长而表达较高:COL1A1,COL6A1,COL6A2,COL14A1,FBLN2,LTBP4和LUM。通过免疫组织化学,我们证明了随着年龄的增长,整个组织中COL6A2的蛋白质水平更高,薄壁组织,气道壁,血管,对于支气管上皮中的COL14A1和LUM,和肺实质中的COL1A1。我们的研究表明,较高的年龄与肺ECM重塑有关,在肺内定义的区域发生特定的差异。这些差异可能会随着年龄的增长而影响肺结构和生理机能,因此可能会增加对发展为慢性肺部疾病的易感性。NEW&NOTEWORTHY我们鉴定了7种年龄相关的细胞外基质(ECM)蛋白,即,COL1A1、COL6A1、COL6A2、COL14A1、FBLN2、LTBP4和LUM随年龄在人肺组织中具有较高的转录物和蛋白质水平。广泛的免疫组织化学分析揭示了整个组织中COL6A2的显著年龄相关差异,薄壁组织,气道壁,和船只,对于支气管上皮中的COL14A1和LUM,和COL1A1在薄壁组织中。我们的发现为研究年龄相关的慢性肺部疾病的ECM差异奠定了新的基础。
Extracellular matrix (ECM) remodeling has been associated with chronic lung diseases. However, information about specific age-associated differences in lung ECM is currently limited. In this study, we aimed to identify and localize age-associated ECM differences in human lungs using comprehensive transcriptomic, proteomic, and immunohistochemical analyses. Our previously identified age-associated gene expression signature of the lung was re-analyzed limiting it to an aging signature based on 270 control patients (37-80 years) and focused on the Matrisome core geneset using geneset enrichment analysis. To validate the age-associated transcriptomic differences on protein level, we compared the age-associated ECM genes (false discovery rate, FDR < 0.05) with a profile of age-associated proteins identified from a lung tissue proteomics dataset from nine control patients (49-76 years) (FDR < 0.05). Extensive immunohistochemical analysis was used to localize and semi-quantify the age-associated ECM differences in lung tissues from 62 control patients (18-82 years). Comparative analysis of transcriptomic and proteomic data identified seven ECM proteins with higher expression with age at both gene and protein levels: COL1A1, COL6A1, COL6A2, COL14A1, FBLN2, LTBP4, and LUM. With immunohistochemistry, we demonstrated higher protein levels with age for COL6A2 in whole tissue,
parenchyma, airway wall, and blood vessel, for COL14A1 and LUM in bronchial epithelium, and COL1A1 in lung
parenchyma. Our study revealed that higher age is associated with lung ECM remodeling, with specific differences occurring in defined regions within the lung. These differences may affect lung structure and physiology with aging and as such may increase susceptibility to developing chronic lung diseases.NEW & NOTEWORTHY We identified seven age-associated extracellular matrix (ECM) proteins, i.e., COL1A1, COL6A1, COL6A2 COL14A1, FBLN2, LTBP4, and LUM with higher transcript and protein levels in human lung tissue with age. Extensive immunohistochemical analysis revealed significant age-associated differences for COL6A2 in whole tissue,
parenchyma, airway wall, and vessel, for COL14A1 and LUM in bronchial epithelium, and COL1A1 in
parenchyma. Our findings lay a new foundation for the investigation of ECM differences in age-associated chronic lung diseases.