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Jeudy J. Interstitial Lung Abnormalities: The More We Learn, the Less We Know. Radiology 2023; 307:e222996. [PMID: 36537900 DOI: 10.1148/radiol.222996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Affiliation(s)
- Jean Jeudy
- From the Department of Diagnostic Radiology, University of Maryland School of Medicine, 22 S Greene St, Baltimore, MD 21201
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Huang Y, Guzy R, Ma SF, Bonham CA, Jou J, Schulte JJ, Kim JS, Barros AJ, Espindola MS, Husain AN, Hogaboam CM, Sperling AI, Noth I. Central lung gene expression associates with myofibroblast features in idiopathic pulmonary fibrosis. BMJ Open Respir Res 2023; 10:10/1/e001391. [PMID: 36725082 PMCID: PMC9896241 DOI: 10.1136/bmjresp-2022-001391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 01/13/2023] [Indexed: 02/03/2023] Open
Abstract
RATIONALE Contribution of central lung tissues to pathogenesis of idiopathic pulmonary fibrosis (IPF) remains unknown. OBJECTIVE To ascertain the relationship between cell types of IPF-central and IPF-peripheral lung explants using RNA sequencing (RNA-seq) transcriptome. METHODS Biopsies of paired IPF-central and IPF-peripheral along with non-IPF lungs were selected by reviewing H&E data. Criteria for differentially expressed genes (DEG) were set at false discovery rate <5% and fold change >2. Computational cell composition deconvolution was performed. Signature scores were computed for each cell type. FINDINGS Comparison of central IPF versus non-IPF identified 1723 DEG (1522 upregulated and 201 downregulated). Sixty-two per cent (938/1522) of the mutually upregulated genes in central IPF genes were also upregulated in peripheral IPF versus non-IPF. Moreover, 85 IPF central-associated genes (CAG) were upregulated in central IPF versus both peripheral IPF and central non-IPF. IPF single-cell RNA-seq analysis revealed the highest CAG signature score in myofibroblasts and significantly correlated with a previously published activated fibroblasts signature (r=0.88, p=1.6×10-4). CAG signature scores were significantly higher in IPF than in non-IPF myofibroblasts (p=0.013). Network analysis of central-IPF genes identified a module significantly correlated with the deconvoluted proportion of myofibroblasts in central IPF and anti-correlated with inflammation foci trait in peripheral IPF. The module genes were over-represented in idiopathic pulmonary fibrosis signalling pathways. INTERPRETATION Gene expression in central IPF lung regions demonstrates active myofibroblast features that contributes to disease progression. Further elucidation of pathological transcriptomic state of cells in the central regions of the IPF lung that are relatively spared from morphological rearrangements may provide insights into molecular changes in the IPF progression.
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Affiliation(s)
- Yong Huang
- Division of Pulmonary & Critical Care Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Rob Guzy
- Section of Pulmonary & Critical Care Medicine, University of Chicago, Chicago, Illinois, USA
| | - Shwu-Fan Ma
- Division of Pulmonary & Critical Care Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Catherine A Bonham
- Division of Pulmonary & Critical Care Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Jonathan Jou
- Department of Surgery, University of Illinois, Peoria, Illinois, USA
| | - Jefree J Schulte
- Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison, Wisconsin, USA
| | - John S Kim
- Division of Pulmonary & Critical Care Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Andrew J Barros
- Division of Pulmonary & Critical Care Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Milena S Espindola
- Division of Pulmonary & Critical Care Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Aliya N Husain
- Department of Pathology, University of Chicago, Chicago, Illinois, USA
| | - Cory M Hogaboam
- Division of Pulmonary & Critical Care Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Anne I Sperling
- Division of Pulmonary & Critical Care Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Imre Noth
- Division of Pulmonary & Critical Care Medicine, University of Virginia, Charlottesville, Virginia, USA
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Yue D, Zhang Q, Zhang J, Liu W, Chen L, Wang M, Li R, Qin S, Song X, Ji Y. Diesel exhaust PM2.5 greatly deteriorates fibrosis process in pre-existing pulmonary fibrosis via ferroptosis. ENVIRONMENT INTERNATIONAL 2023; 171:107706. [PMID: 36565570 DOI: 10.1016/j.envint.2022.107706] [Citation(s) in RCA: 24] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 12/09/2022] [Accepted: 12/17/2022] [Indexed: 06/17/2023]
Abstract
Fine particulate matter (PM2.5) has been widely reported to contribute to the pathogenesis of pulmonary diseases. The direct hazardous effect of PM2.5 on the respiratory system at high concentrations in vitro and in vivo have been well identified. However, its effect on the pre-existing respiratory diseases of patients at environment-related concentrations remains unclear. Diesel exhaust PM2.5 as a primary representative of ambient PM2.5 fine particles were used to investigated the effect of PM2.5 on the fibrosis progression of existing pulmonary fibrosis disease models. This study reported that PM2.5 could result in the enhanced sensitivity to fibrotic response, which may be ascribed to ferroptosis induced by PM2.5 in damaged lung areas. Proteomic analysis revealed that the upregulation of HO-1 as a key mechanism in the ferroptosis and exacerbation of pulmonary fibrosis induced by PM2.5. As a result, HO-1 degraded heme-containing protein and released iron in fibrotic cells, leading to generation of mitochondrial ROS and impaired mitochondrial function. Transmission electron microscopic assay verified that PM2.5 entered the mitochondria of fibrotic cells and was accompanied by significant mitochondrial morphological changes characterized by increased mitochondrial membrane density and reduced mitochondrial size. The HO-1 inhibitor zinc protoporphyrin and mitochondrion-targeted antioxidant Mito-TEMPO significantly attenuated PM2.5-induced ferroptosis and exacerbation of fibrosis. In addition, AMPK-ULK1 axis-triggered autophagy activation and NCOA4-mediated degradation of ferritin by autophagy were found to be related to the PM2.5-induced ferroptosis of fibrotic cells. As evidenced by the inhibition of autophagy with 3-methyladenine or AMPK inhibitor, NCOA4 knockdown decreased intracellular iron accumulation and lipid peroxidation, thereby relieving PM2.5-induced epithelial-mesenchymal transition and cell death in fibrotic cells. Overall, this study provided experimental support for the idea that PM2.5 greatly deteriorates fibrosis process in pre-existing pulmonary fibrosis, and HO-1-mediated mitochondrial dysfunction and NCOA4-mediated ferritinophagy are jointly required for the PM2.5-induced ferroptosis and enhanced fibrosis effects.
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Affiliation(s)
- Dayong Yue
- Department of Cellular and Genetic Medicine, School of Pharmaceutical Sciences, Binzhou Medical University, Yantai 264003, China
| | - Qian Zhang
- Department of Pathology, Binzhou Medical University Hospital, Binzhou Medical University, Binzhou 256603, China
| | - Jinjin Zhang
- Department of Cellular and Genetic Medicine, School of Pharmaceutical Sciences, Binzhou Medical University, Yantai 264003, China
| | - Weili Liu
- Department of Respiratory and Critical Care Medicine, Binzhou Medical University Hospital, Binzhou Medical University, Binzhou 256603, China
| | - Libang Chen
- Department of Cellular and Genetic Medicine, School of Pharmaceutical Sciences, Binzhou Medical University, Yantai 264003, China
| | - Meirong Wang
- Department of Respiratory and Critical Care Medicine, Binzhou Medical University Hospital, Binzhou Medical University, Binzhou 256603, China
| | - Rongrong Li
- Department of Respiratory and Critical Care Medicine, Binzhou Medical University Hospital, Binzhou Medical University, Binzhou 256603, China
| | - Song Qin
- Key Laboratory of Biology & Bioresource Utilization, Yantai Institute of Costal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
| | - Xiaodong Song
- Department of Cellular and Genetic Medicine, School of Pharmaceutical Sciences, Binzhou Medical University, Yantai 264003, China.
| | - Yunxia Ji
- Department of Cellular and Genetic Medicine, School of Pharmaceutical Sciences, Binzhou Medical University, Yantai 264003, China; Department of Respiratory and Critical Care Medicine, Binzhou Medical University Hospital, Binzhou Medical University, Binzhou 256603, China.
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Ghio AJ, Pavlisko EN, Roggli VL, Todd NW, Sangani RG. Cigarette Smoke Particle-Induced Lung Injury and Iron Homeostasis. Int J Chron Obstruct Pulmon Dis 2022; 17:117-140. [PMID: 35046648 PMCID: PMC8763205 DOI: 10.2147/copd.s337354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 12/06/2021] [Indexed: 11/23/2022] Open
Abstract
It is proposed that the mechanistic basis for non-neoplastic lung injury with cigarette smoking is a disruption of iron homeostasis in cells after exposure to cigarette smoke particle (CSP). Following the complexation and sequestration of intracellular iron by CSP, the host response (eg, inflammation, mucus production, and fibrosis) attempts to reverse a functional metal deficiency. Clinical manifestations of this response can present as respiratory bronchiolitis, desquamative interstitial pneumonitis, pulmonary Langerhans’ cell histiocytosis, asthma, pulmonary hypertension, chronic bronchitis, and pulmonary fibrosis. If the response is unsuccessful, the functional deficiency of iron progresses to irreversible cell death evident in emphysema and bronchiectasis. The subsequent clinical and pathological presentation is a continuum of lung injuries, which overlap and coexist with one another. Designating these non-neoplastic lung injuries after smoking as distinct disease processes fails to recognize shared relationships to each other and ultimately to CSP, as well as the common mechanistic pathway (ie, disruption of iron homeostasis).
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Affiliation(s)
- Andrew J Ghio
- Human Studies Facility, US Environmental Protection Agency, Chapel Hill, NC, 27514, USA
- Correspondence: Andrew J Ghio Human Studies Facility, US Environmental Protection Agency, 104 Mason Farm Road, Chapel Hill, NC, USA Email
| | | | | | - Nevins W Todd
- Department of Medicine, University of Maryland, Baltimore, MD, 21201, USA
| | - Rahul G Sangani
- Department of Medicine, West Virginia University, Morgantown, WV, USA
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Transcriptomic evidence of immune activation in macroscopically normal-appearing and scarred lung tissues in idiopathic pulmonary fibrosis. Cell Immunol 2018; 325:1-13. [PMID: 29329637 DOI: 10.1016/j.cellimm.2018.01.002] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 12/19/2017] [Accepted: 01/02/2018] [Indexed: 12/16/2022]
Abstract
Idiopathic pulmonary fibrosis (IPF) is a fatal lung disease manifested by overtly scarred peripheral and basilar regions and more normal-appearing central lung areas. Lung tissues from macroscopically normal-appearing (IPFn) and scarred (IPFs) areas of explanted IPF lungs were analyzed by RNASeq and compared with healthy control (HC) lung tissues. There were profound transcriptomic changes in IPFn compared with HC tissues, which included elevated expression of numerous immune-, inflammation-, and extracellular matrix-related mRNAs, and these changes were similar to those observed with IPFs compared to HC. Comparing IPFn directly to IPFs, elevated expression of epithelial mucociliary mRNAs was observed in the IPFs tissues. Thus, despite the known geographic tissue heterogeneity in IPF, the entire lung is actively involved in the disease process, and demonstrates pronounced elevated expression of numerous immune-related genes. Differences between normal-appearing and scarred tissues may thus be driven by deranged epithelial homeostasis or possibly non-transcriptomic factors.
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Abstract
INTRODUCTION Many forms of interstitial lung disease (ILD) can progress to extensive fibrosis and respiratory failure. Idiopathic pulmonary fibrosis (IPF), which generally has a poor prognosis, has been thoroughly studied over the past two decades, and many important discoveries have been made that pertain to genetic predisposition, epidemiology, disease pathogenesis, diagnosis, and management. Additionally, non-IPF forms of ILD can have radiologic and histopathologic manifestations that mimic IPF, and making an accurate diagnosis is key to providing personalized medicine to patients with pulmonary fibrosis. Areas covered: This manuscript discusses current knowledge pertaining to the genetics, epidemiology, pathogenesis, and diagnosis of pulmonary fibrosis with an emphasis on IPF. The material upon which this discussion is based was obtained from various published texts and manuscripts identified via literature searching (e.g. PubMed). Expert commentary: Many genetic variants have been identified that are associated with risk of developing pulmonary fibrosis, and an improved understanding of the influence of both genomic and epigenomic factors in the development of pulmonary fibrosis is rapidly evolving. Because many forms of fibrosing ILD can have similar radiologic and histopathologic patterns yet have different responses to therapeutic interventions, making an accurate diagnosis of specific forms of pulmonary fibrosis is increasingly important.
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Affiliation(s)
- Keith C Meyer
- a Department of Medicine , University of Wisconsin School of Medicine and Public Health - Medicine , Madison , WI , United States
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