Abstract
IL-39 (Interleukin-39) is a heterodimeric cytokine composed of IL-23p19 and EBI3 (Epstein-Barr virus-induced gene 3) subunits. Despite the evidence that correlates the role of IL-39 in regulating inflammation, its expression in the intestinal microenvironment of IBD (inflammatory bowel disease) patients is still unknown. Thus, this work was focused on characterizing relative mRNA (messenger RNA) IL-39 expression and intestinal synthesis in IBD patients. This study includes 37 patients diagnosed with ulcerative colitis (UC), 15 with Chron’s disease (CD), and 22 controls. Gene expression of IL-39 subunits (IL-23p19/EBI3) was measured by RT-PCR (real time polymerase chain reaction). Intestinal synthesis was evaluated by immunohistochemistry and serum levels by ELISA. Statistical analysis was done using Prism GraphPad V6. Relative mRNA IL-39 expression was increased in patients with active UC and active CD compared to the remission UC, remission CD, and control group. High levels of relative mRNA expression of IL-39 (IL-23p19 subunit) were associated with histological activity. IHQ analysis showed increased IL-39 production in mucosa, submucosa, muscular, and serosa layer of patients with active disease. IL-39 serum production was increased in patients with UC. IL-39 gene’s upregulation was found in patients with active IBD and was associated with severe histological activity in UC. This is the first report regarding the role of IL-39 in patients with IBD. The findings suggest that IL-39 might play a role as an inflammatory mediator in active IBD and could be considered a new alternative in treating this condition.
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Abbreviations
- aUC:
-
Active ulcerative colitis
- aCD:
-
Active Crohn’s disease
- BAFF B:
-
Cell activation factor
- cDNA:
-
Complementary DNA
- DAB:
-
Diaminobenzidine
- dNTPs:
-
Deoxyribonucleotide triphosphate
- EBI3:
-
Epstein-Barr Virus-Induced Gene 3
- GADPH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- HRP:
-
Horseradish peroxidase
- IBD:
-
Inflammatory bowel disease
- IL-39:
-
Interleukin-39
- IL-23p19:
-
Interleukin 23 p19 subunit
- LPS:
-
Lipopolysaccharide
- MgCl2 :
-
Magnesium chloride
- mRNA:
-
Messenger ribonucleic acid
- PCR:
-
Polymerase chain reaction
- RT:
-
Reverse transcription
- RT-PCR:
-
Real-Time Polymerase Chain Reaction
- Rcd:
-
Remission CD
- rUC:
-
Remission ulcerative colitis
- SD:
-
Standard deviation
- SEM:
-
Standard error of the mean
- STAT1/STAT3:
-
Signal transducer and activator of transcription 1–3
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Funding
This work was supported by funds from the Inflammatory Bowel Disease Clinic at the National Institute of Medical Sciences and Nutrition.
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GFC participated during the sample processing, performed RT-qPCR analysis for IL-39 transcript level quantification, performed IHQ analysis for protein expression, and data analysis, and prepared the manuscript, critical reviewing, and bibliographic analysis.
JFC participated during IHQ analysis for protein expression, data analysis, prepared the manuscript, critical reviewing, and bibliographic analysis.
BMB and RBZ participate during the sample acquisition.
JKYF provided the research idea and financial resources as well as assessed clinical, endoscopic and histological findings, data analysis, prepared and coordinated the manuscript editing.
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Fonseca-Camarillo, G., Furuzawa-Carballeda, J., Barreto-Zúñiga, R. et al. Increased synthesis and intestinal expression of IL-39 in patients with inflammatory bowel disease. Immunol Res 72, 284–292 (2024). https://doi.org/10.1007/s12026-023-09432-x
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DOI: https://doi.org/10.1007/s12026-023-09432-x