ArticleScientific reports2021
Proteolytic cleavage of HLA class II by human neutrophil elastase in pneumococcal pneumonia.
Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed, 14 citations in OpenAlex.
- Dipeptidyl peptidase-1 inhibition in patients hospitalised with COVID-19: a multicentre, double-blind, randomised, parallel-group, placebo-controlled trial.The Lancet. Respiratory medicine · 2022Trial
- Immune cell disorder in viral pneumonia.Journal of translational medicine · 2026Review
- Genome-wide H3K4me3 profiling of circulating immune cells reveals dynamic epigenetic reprogramming during acute critical COVID-19.Frontiers in immunology · 2026Article
- Effects of Ulinastatin on Inflammation Response and Lung Tissue Injury in Deep Hypothermic Circulatory Arrest.Interdisciplinary cardiovascular and thoracic surgery · 2025Article
- Systemic immune-inflammation index as a prognostic marker in HER2-positive breast cancer patients undergoing trastuzumab therapy.Scientific reports · 2024Article
- On the path to predicting immune responses in the lung: Modeling the pulmonary innate immune system at the air-liquid interface (ALI).European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences · 2023Review
- Innate immune deficiencies are associated with severity and poor prognosis in patients with COVID-19.Scientific reports · 2022Article
- Clarithromycin Inhibits Pneumolysin Production via Downregulation ofMicrobiology spectrum · 2021Article
- A Fragile Balance: Does Neutrophil Extracellular Trap Formation Drive Pulmonary Disease Progression?Cells · 2021Review
- The Role of Neutrophils and Neutrophil Elastase in Pneumococcal Pneumonia.Frontiers in cellular and infection microbiology · 2021Review
Corrections and comments
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Authors and funding
6 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Bacterial and viral respiratory infections can initiate acute lung injury and acute respiratory distress syndrome. Neutrophils and their granule enzymes, including neutrophil elastase, are key mediators of the pathophysiology of acute respiratory failure. Although intracellular neutrophil elastase functions as a host defensive factor against pathogens, its leakage into airway spaces induces degradation of host connective tissue components. This leakage disrupts host innate immune responses via proteolytic cleavage of Toll-like receptors and cytokines. Here, we investigated whether neutrophils possess proteases that cleave adaptive immune molecules. We found that expression of the human leukocyte antigen (HLA) class II molecule HLA-DP β1 was decreased in THP-1-derived macrophages treated with supernatants from dead neutrophils. This decreased HLA-DP β1 expression was counteracted by treatment with neutrophil elastase inhibitor, suggesting proteolytic cleavage of HLA-DP β1 by neutrophil elastase. SDS-PAGE showed that neutrophil elastase cleaved recombinant HLA-DP α1, -DP β1, -DQ α1, -DQ β1, -DR α, and -DR β1. Neutrophil elastase also cleaved HLA-DP β1 on extracellular vesicles isolated from macrophages without triggering morphological changes. Thus, leakage of neutrophil elastase may disrupt innate immune responses, antigen presentation, and T cell activation. Additionally, inhibition of neutrophil elastase is a potential therapeutic option for treating bacterial and viral pneumonia.
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