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Neutrophil Extracellular Traps (NETs) in Immunity and Diseases, 3rd Edition

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Immunology".

Deadline for manuscript submissions: 20 December 2025 | Viewed by 3382

Special Issue Editor


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Guest Editor
Department of Pediatric Surgery, University Medical Center Mannheim, University Heidelberg, 68167 Mannheim, Germany
Interests: neutrophils; neutrophil extracellular traps; pediatric diseases; pediatric cancers
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Special Issue Information

Dear Colleagues,

This Special Issue is a continuation of our previous Special Issue “Neutrophil Extracellular Traps (NETs) in Immunity and Diseases: 2nd Edition” (https://www.mdpi.com/journal/ijms/special_issues/2I8LVEULI6).

Currently, research in this area has mainly focused on adaptive immune responses and the broad applications of NETs. Human death rates are highly influenced by diseases such as sepsis, multiresistant microbes, autoimmune disorders, and cancer, in which innate immunity plays a leading role. Therefore, greater attention should be paid to the innate immune response, and especially to neutrophils, which play an invaluable role in the host’s immune defense. Cytokines and other stimuli direct these cells into infected tissues, where they eliminate invading microbes. Notably, a successful neutrophil defense is often associated with inflammatory tissue damage and diseases including allergies, autoimmune diseases, atherosclerosis, thrombus formation, and metabolic disorders. These have been linked to the capability of activated neutrophils to release decondensed chromatin decorated with granular proteins known as neutrophil extracellular traps (NETs). NETs act as a scaffold for the aggregation of viable, necrotic, and apoptotic cells, as well as crystals and microbes. Importantly, under specific conditions, NETs act through either an inflammatory or anti-inflammatory process.

Although significant efforts have been made to study the release of NETs, we still need to broaden our knowledge of this unique feature of the innate immune response. Showing the contribution of NETs to various pathological conditions and the metastasis of cancer and gaining a deeper understanding of the mechanisms behind the release of NETs, as well as their role in the immune response and diseases, is of great importance. Additionally, the degradation of NETs and their clearance is only partially understood and warrants further research.

The focus of this Special Issue is on updating the current research on NETs in immunity and disease, improving our understanding of this phenomenon, and developing new therapeutic strategies for various pathological conditions related to the excessive release of NETs and/or their incomplete degradation. Both review and original articles covering basic, translational, or clinical molecular-data-supported research are welcome.

Dr. Jasmin Knopf
Guest Editor

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Keywords

  • neutrophils
  • neutrophil functions
  • neutrophil extracellular traps (NETs)
  • NET biology
  • NETs in autoimmune diseases
  • NETs in immune response
  • NETs in the development and progression of cancer diseases
  • NETs in immunothrombosis
  • degradation of NETs

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Published Papers (3 papers)

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Research

19 pages, 4601 KB  
Article
Neutrophil Extracellular Trap Markers in Post Mortem Lung Biopsies from COVID-19 Patients
by Mariana Collete, Thiago Rodrigues dos Santos, Natan de Araújo, Ana Paula Camargo Martins, Seigo Nagashima, Caroline Busatta Vaz de Paula, Cleber Machado-Souza and Lucia de Noronha
Int. J. Mol. Sci. 2025, 26(16), 8059; https://doi.org/10.3390/ijms26168059 - 20 Aug 2025
Viewed by 571
Abstract
Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), the causative agent of COVID-19, spread rapidly across the globe in 2020, with most countries experiencing two distinct waves of infection. In Brazil, the second wave was marked by the emergence of the P.1 (Gamma) variant, [...] Read more.
Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), the causative agent of COVID-19, spread rapidly across the globe in 2020, with most countries experiencing two distinct waves of infection. In Brazil, the second wave was marked by the emergence of the P.1 (Gamma) variant, which disproportionately affected younger individuals and was associated with increased mortality. This study aimed to evaluate the epidemiological profile and post mortem histopathological lung findings, correlate them with laboratory results, and compare the first and second waves of COVID-19. To investigate neutrophil extracellular traps (NETs), we performed immunohistochemistry for citrullinated histone H3 (cit-H3) and myeloperoxidase (MPO). Our cohort included patients who died in the intensive care unit (ICU) of a single center in southern Brazil. The study included 42 patients, 24 from the first wave and 18 from the second, who died between March 2020 and August 2021. Laboratory data included complete blood counts and D-dimer levels. Histopathological analyses were conducted using H&E-stained slides and reviewed independently by two blinded pathologists. MPO and cit-H3 immunohistochemistry were performed to evaluate NETs markers. All cases exhibited varying degrees of inflammation and diffuse alveolar damage (DAD), with frequent microvascular thrombi. Neutrophilic infiltration was significantly higher in the second wave. Additionally, cases with intense neutrophilic infiltration showed a stronger association with thrombosis. NETs were identified in 10 cases. No significant correlation was found between histopathological findings, NETs, and laboratory blood count results. The histopathological findings were consistent with those reported globally. The second wave of COVID-19 showed higher neutrophilic infiltrate in the lung tissue. Neutrophils play a key role in the inflammatory response and NET formation might indicate an increased risk of mortality. Further studies can consider NET-targeted therapies as potential strategies. Full article
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17 pages, 1671 KB  
Article
IL-1b-Bearing NETs: Bridging Inflammation to Early Cirrhosis in Hepatitis B
by Maria Ntinopoulou, Theocharis Konstantinidis, Anna Chalkidou, Eleni Papagianni, Aikaterini Skeva, Maria Panopoulou and Akrivi Chrysanthopoulou
Int. J. Mol. Sci. 2025, 26(12), 5733; https://doi.org/10.3390/ijms26125733 - 15 Jun 2025
Viewed by 1047
Abstract
Hepatitis B virus (HBV) infection is one of the most dangerous viral diseases, with innate immunity representing the first line of defense against the virus. In this branch of the immune system, neutrophils are considered key cellular mediators. To better understand the implication [...] Read more.
Hepatitis B virus (HBV) infection is one of the most dangerous viral diseases, with innate immunity representing the first line of defense against the virus. In this branch of the immune system, neutrophils are considered key cellular mediators. To better understand the implication of neutrophils in the distinct stages of the disease, HBV-infected patients were enrolled in this study and categorized into three groups: patients with acute infection, chronic infection under treatment, and at early cirrhotic stage. To elucidate the role of inflammatory mediators and cellular mechanisms of neutrophilic origin in the course of the infection, both ex vivo and in vitro studies were performed. Increased levels of C-C motif chemokine ligand 2 (CCL2), interleukin (IL)-18, IL-33, and citrullinated histone H3 (CitH3)—an accurate marker of neutrophil extracellular traps (NETs)—were detected in the circulation of patients with acute infection or early cirrhosis. In parallel, sera from the aforementioned patient groups induced the formation of IL-1b-bearing NETs in neutrophils from healthy individuals. These inflammatory NETs affected primary fibroblasts towards acquiring a pro-fibrotic phenotype. These results suggest that NETs could be regarded as mediators in hepatitis B manifestations, while their therapeutic targeting could enhance the management of early-stage cirrhotic patients. Full article
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27 pages, 6113 KB  
Article
Peptidylarginine Deiminase 4 Deficiency Suppresses Neutrophil Extracellular Trap Formation and Ameliorates Elastase-Induced Emphysema in Mouse Lung
by Megumi Katsumata, Jun Ikari, Akira Urano, Eiko Suzuki, Kazuto Kugou, Yoshinori Hasegawa, Koichiro Tatsumi and Takuji Suzuki
Int. J. Mol. Sci. 2025, 26(12), 5573; https://doi.org/10.3390/ijms26125573 - 11 Jun 2025
Viewed by 1198
Abstract
Neutrophil extracellular traps (NETs) are associated with the extracellular release of nuclear chromatin decorated with cytoplasmic proteins. Excessive release of NETs has been reported in chronic lung diseases, including chronic obstructive pulmonary disease (COPD). However, the role of NETs in the pathogenesis of [...] Read more.
Neutrophil extracellular traps (NETs) are associated with the extracellular release of nuclear chromatin decorated with cytoplasmic proteins. Excessive release of NETs has been reported in chronic lung diseases, including chronic obstructive pulmonary disease (COPD). However, the role of NETs in the pathogenesis of COPD remains unclear. Peptidylarginine deaminase 4 (PAD4) contributes to NET formation. Therefore, in an elastase (ELS)-induced emphysema mouse model, we examined the role of PAD4 using Padi4 gene knockout (KO) mice. First, we confirmed that ELS induced NET formation in the parenchyma of the lungs. PAD4 deficiency suppressed ELS-induced NET expression and tended to ameliorate the lung tissue injury. The cellular profile of bronchoalveolar lavage fluid (BALF) did not differ between the two groups. Additionally, PAD4 deficiency ameliorated emphysema and apoptosis in lung cells. Finally, we examined the effects of PAD4 on comprehensive gene expression signatures using RNA sequencing. Enrichment analysis of the transcriptomic data revealed that the expression of several genes associated with COPD pathogenesis was altered in the KO mice. Overall, the results suggest that PAD4 deficiency improves NET formation and emphysema in the lungs; this pathway can be a potential therapeutic target for the treatment of COPD. Full article
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