Neutrophil Extracellular Traps in Pediatric Inflammatory Bowel Disease: A Potential Role in Ulcerative Colitis
Rachel Shukrun1,2,3, Victoria Fidel1, Szilvia Baron1
1Pediatric Hemato-Oncology Research Laboratory, Tel Aviv Medical Center, Tel Aviv 6423906, Israel.
Insights
Neutrophil extracellular traps (NETs) are elevated in pediatric inflammatory bowel disease (IBD) biopsies and blood, particularly in ulcerative colitis (UC). NET formation normalized in UC patients who achieved remission, suggesting a potential therapeutic target.
Area of Science:
- Gastroenterology
- Immunology
- Pediatrics
Background:
- Inflammatory bowel disease (IBD), including Crohn's disease (CD) and ulcerative colitis (UC), is a chronic gut inflammation affecting children and adults.
- Neutrophil extracellular traps (NETs) are neutrophil-derived structures implicated in tissue damage in various inflammatory conditions.
Purpose of the Study:
- To investigate the presence and role of NETs in pediatric IBD.
- To compare NET levels in intestinal biopsies and peripheral blood of pediatric IBD patients with healthy controls.
Main Methods:
- Analysis of intestinal biopsies and peripheral blood from 20 pediatric IBD patients (CD and UC) and controls.
- Assessment of neutrophil infiltration and NET formation using biopsy staining and neutrophil activation assays.
- Measurement of NET protein enzymatic activity and evaluation of NET formation in UC patients during remission.
Main Results:
- Pediatric IBD biopsies (both UC and CD) showed significantly higher neutrophil and NET levels than controls.
- Ulcerative colitis (UC) demonstrated the strongest association with increased NETs.
- Peripheral blood neutrophils from newly diagnosed UC patients exhibited heightened NET formation compared to controls and CD patients.
- NET formation in UC patients returned to normal levels after successful remission-inducing treatment.
Conclusions:
- NETs may play a significant role in the pathogenesis of pediatric IBD, especially UC.
- Further research is warranted to elucidate NET mechanisms in pediatric IBD.
- Targeting NET formation could represent a novel therapeutic strategy for pediatric IBD.
Abstract:
Inflammatory bowel disease (IBD), encompassing Crohn's disease (CD) and ulcerative colitis (UC), is a chronic inflammatory condition of the gut affecting both adults and children. Neutrophil extracellular traps (NETs) are structures released by activated neutrophils, potentially contributing to tissue damage in various diseases. This study aimed to explore the presence and role of NETs in pediatric IBD. We compared intestinal biopsies and peripheral blood from 20 pediatric IBD patients (UC and CD) to controls. Biopsy staining and techniques for neutrophil activation were used to assess neutrophil infiltration and NET formation. We also measured the enzymatic activity of key NET proteins and evaluated NET formation in UC patients in remission. Both UC and CD biopsies showed significantly higher levels of neutrophils and NETs compared to controls (p < 0.01), with UC exhibiting the strongest association. Peripheral blood neutrophils from UC patients at diagnosis displayed increased NET formation compared to controls and CD patients. Interestingly, NET formation normalized in UC patients following remission-inducing treatment. This pilot study suggests a potential role for NETs in pediatric IBD, particularly UC. These findings warrant further investigation into the mechanisms of NET involvement and the potential for targeting NET formation as a therapeutic strategy.
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