Interleukin Signatures as Prognostic Biomarkers in Ulcerative Colitis: From Immune Pathways to Clinical Prediction

Area of Science:

• Immunology
• Gastroenterology
• Molecular Biology

Background:

• Ulcerative colitis (UC) exhibits heterogeneous histologic activity often disconnected from clinical presentation.
• Persistent microscopic inflammation in UC impacts relapse, treatment failure, and long-term outcomes.
• Interleukins (ILs) are key regulators of mucosal immunity, influencing epithelial injury and resolution in UC.

Purpose of the Study:

• To review evidence on IL networks and their association with histologic activity and persistence in UC.
• To emphasize IL-23-driven pathways in relation to histologic severity and resistance to resolution.
• To highlight the role of IL-10 in remission and mucosal healing versus its insufficiency in persistent inflammation.

Main Methods:

• Narrative review synthesizing mechanistic, translational, genetic, and clinical evidence.
• Focus on IL networks, particularly IL-23, IL-10, IL-6, IL-1β, IL-8, and IL-17A.
• Analysis of IL patterns in relation to histologic disease activity and persistence.

Main Results:

• IL-23 pathways correlate strongly with histologic severity and sustained microscopic inflammation.
• Adequate IL-10 signaling is linked to histologic remission and mucosal healing.
• Downstream ILs (IL-6, IL-1β, IL-8, IL-17A) mediate neutrophil recruitment and epithelial injury.

Conclusions:

• Coordinated IL patterns reflect specific immunopathologic states in UC.
• These IL patterns provide a framework for interpreting histologic activity and disease persistence.
• Understanding IL networks can enhance assessment of UC beyond symptom-based evaluations.