PAI-1 Derived from Alveolar Type 2 Cells Drives Aging-Associated Pulmonary Fibrosis

扫码查看

原文链接

万方数据
维普

外文摘要：Pulmonary fibrosis(PF)is a lethal lung disease that predominantly affects older adults;however,whether and how aging triggers fibrosis remains unclear.To pinpoint the predominant initiating factors of PF,we first analyzed single-cell RNA sequencing(scRNA-seq)data from the lung tissues of 45 normal donors and 51 PF patients and found that aging might serve as the primary catalyst for PF development.To further investigate the influence of aging on PF formation,we conducted a comprehensive and thorough study employing a natural aging mouse model.We found that dynamic alterations in the quantity and types of collagen fibers during aging-induced PF progression,especially in collagenous(Col)Ⅰ,emerged as the predominant driver of PF.We then investigated the regulation of Col Ⅰ synthesis during aging using primary alveolar type 2(AT2)cells and A549 cells line through conditioned media and Transwell cocul-ture,and found that secretions-particularly plasminogen activator inhibitor(PAI)-1-from aged AT2 cells promoted fibrosis and enhanced collagen type Ⅰ alpha 1(Col1al)production via the transforming growth factor(TGF)-β/small mother against decapentaplegic(Smad)2/3 pathway.Furthermore,scRNA-seq and a histological analysis of human lung tissue demonstrated a significant upregulation of SERPINE1(the gene encoding PAI-1)and PAI-1 expression in both aging lung tissue and AT2 cells,which was consistent with our findings from animal experiments,providing additional evidence for the pivotal role of PAI-1 during aging and the development of PF.Our research demonstrates that PAI-1,a crucial factor secreted by aging AT2 cells,exerts a pivotal role in promoting the synthesis of Col1a1 in fibroblasts,subsequently leading to Col Ⅰ deposition,and in driving the progression of PF by mediating the TGF-β/Smad2/3 pathway.Our find-ings offer critical evidence for the involvement of epithelial dysfunction in age-related PF and provides potential novel therapeutic targets for clinical intervention.

外文关键词：

AgingPulmonary fibrosisAlveolar type 2 cellsPAI-1

作者：

Rui Quan、Chenhong Shi、Yanan Sun、Chengying Zhang、Ran Bi、Yiran Zhang、Xin Bi、Bin Liu、Ziheng Dong、Dekui Jin、Yixuan Li

展开 >

作者单位：

Key Laboratory of Functional Dairy,Co-Constructed by the Ministry of Education and Beijing Municipality,Beijing 100083,China

Department of General Practice,The Third Medical Center of the Chinese PLA General Hospital,Beijing 100039,China

Department of Thoracic Surgery,The Third Medical Center of the Chinese PLA General Hospital,Beijing 100039,China

Center for Nanomedicine and Department of Anesthesiology,Brigham and Women's Hospital,Harvard Medical School,Boston,MA 02115,USA

School of Computer and Information Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China

展开 >

出版年：

2024

DOI：

10.1016/j.eng.2024.08.014

工程(英文)

CSTPCDEI

ISSN：2095-8099

年,卷(期)：2024.42(11)