Quantitative proteomic characterization of lung tissue in idiopathic pulmonary fibrosis
Open accessAbstract
BACKGROUND: Idiopathic pulmonary fibrosis (IPF) is a progressive, eventually fatal disease. IPF is characterized by excessive accumulation of the extracellular matrix (ECM) in the alveolar parenchyma and progressive lung scarring. The pathogenesis of IPF and whether the ECM involved in the process remain unknown. METHODS: To identify potential treatment target and ECM associated proteins that may be involved in the development of IPF, we employed isobaric tag for relative and absolute quantitation (iTRAQ) combined liquid chromatography-tandem mass spectrometry (LC-MS/MS) approach to examine protein expression in lung tissues from IPF patients. RESULTS: A total of 662 proteins with altered expression (455 upregulated proteins and 207 downregulated proteins) were identified in lung tissue of IPF patients compared with control. KEGG pathway enrichment analysis showed that the altered proteins in lung tissue mainly belonged to the PI3K-Akt signaling, focal adhesion, ECM-receptor interaction, and carbon metabolism pathways. According to the bioinformatic definition of the matrisome, 229 matrisome proteins were identified in lung tissue. These proteins comprised the ECM of lung, of which 104 were core matrisome proteins, and 125 were matrisome-associated proteins. Of the 229 ECM quantified proteins, 56 significantly differentially expressed proteins (19 upregulated proteins and 37 downregulated proteins) were detected in IPF lung tissue samples. In addition to proteins with well-known functions such as COL1A1, SCGB1A1, TAGLN, PSEN2, TSPAN1, CTSB, AGR2, CSPG2, and SERPINB3, we identified several novel ECM proteins with unknown function deposited in IPF lung tissue including LGALS7, ASPN, HSP90AA1 and HSP90AB1. Some of these differentially expressed proteins were further verified using Western blot analysis and immunohistochemical staining. CONCLUSIONS: This study provides a list of proteomes that were detected in IPF lung tissue by iTRAQ technology combined with LC-MS/MS. The findings of this study will contribute better understanding to the pathogenesis of IPF and facilitate the development of therapeutic targets.
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Cav-1 expression in pulmonary fibroblasts and alveolar epithelial cells is decreased in transgenic and rodent bleomycin models of lung injury and in the lungs of patients with IPF.
“Cav-1 expression in pulmonary fibroblasts and alveolar epithelial cells is decreased in transgenic and rodent bleomycin models of lung injury and in the lungs of patients with IPF10–12.”
From Inhaled LTI-03 for idiopathic pulmonary fibrosis: a randomized dose escalation study (2026) · cites this paper as [12]
The Results section (Validation of differentially expressed proteins; page not provided) reports that CAV1 staining in alveolar epithelial cells was strong in control lungs but almost absent in IPF lungs. Our copy does not establish decreased CAV1 in pulmonary fibroblasts or in transgenic or rodent bleomycin lung-injury models. (LLM, conf=0.88)
Experimental — accuracy not yet measuredImmunohistochemical analyses of IPF lung tissue have shown intense GAL-7 expression localized to the alveolar and bronchiolar epithelium and alveolar septum.
“Immunohistochemical analyses of IPF lung tissue have shown intense GAL-7 expression localized to the alveolar and bronchiolar epithelium and alveolar septum12.”
From Inhaled LTI-03 for idiopathic pulmonary fibrosis: a randomized dose escalation study (2026) · cites this paper as [12]
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Cited by
Sorted by citations
Inhaled LTI-03 for idiopathic pulmonary fibrosis: a randomized dose escalation study
Molyneaux, P. L., Hirani, N. A., Chia, C. C. K., Kulkarni, T., Zaman, T., Kaner, R. J., Coelho, A. L., Jannini-Sa, Y. A. P., Windsor, B., Kruger, S., et al. (2026) · Nature Communications · doi:10.1038/s41467-026-75291-3 · Cited by 1 · see citing works
“Immunohistochemical analyses of IPF lung tissue have shown intense GAL-7 expression localized to the alveolar and bronchiolar epithelium and alveolar septum 12 .”
- Authors
- Tian, Y., Li, H., Gao, Y., Liu, C., Qiu, T., Wu, H., Cao, M., Zhang, Y., Ding, H., Chen, J., & Cai, H.
- Affiliations
- Nanjing Drum Tower Hospital (CN)
- Wannan Medical College (CN)
- Traditional Chinese Medicine Hospital of Kunshan (CN)
- Jiangsu University (CN)
- Wuxi People's Hospital (CN)
- Corresponding author
- Chen, Jingyu
- Cai, Hourong
- ORCID
- Venue
- Clinical Proteomics
- Published
- 2019-02-06
- Volume
- 16
- Issue
- 1
- Pages
- 6-6
- ISSN
- 1542-6416 (ISSN-L)
- 1559-0275
- PMC
- PMC6364390
- OpenAlex
- W2922148620
- Cited by
- 74
- References
- 2
- Citations by year
- 2026: 9 · 2025: 13 · 2024: 2 · 2023: 15 · 2022: 12 · 2021: 8 · 2020: 11 · 2019: 4
- FWCI
- 6.43
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Clinical Proteomics (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Jiangsu Provincial Key research and developmen (BE2016611)
- National Natural Science Foundation of China (81670058, 81470253, 81570055, 81670059)
- Topics
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Occupational and environmental lung diseases
- Physical Sciences › Chemistry › Spectroscopy › Advanced Proteomics Techniques and Applications
- Keywords
- idiopathic pulmonary fibrosis, lung proteome, extracellular matrix, matrisome, differentially expressed proteins, PI3K/Akt signaling, focal adhesions, ECM-receptor interaction, lung scarring, therapeutic target, iTRAQ quantification
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