New perspective on dextran sodium sulfate colitis: antigen-specific T cell development during intestinal inflammation

Area of Science:

• Immunology
• Gastroenterology
• Inflammatory Bowel Disease Research

Background:

• CD4+ T cell responses to oral antigens can influence inflammatory bowel disease (IBD).
• The dextran sodium sulfate (DSS) colitis model is widely used for IBD but has limitations in studying T cell involvement.
• Understanding T cell dynamics in IBD models is crucial for therapeutic development.

Purpose of the Study:

• To investigate the induction and detection of antigen-specific T cells during DSS-induced colitis.
• To assess if these antigen-specific T cells persist after colitis resolution.
• To evaluate the utility of the DSS model for studying T cell responses to luminal antigens.

Main Methods:

• Ovalbumin (OVA) was administered orally during DSS colitis induction in mice.
• Disease severity was monitored throughout the experiment.
• Antigen-reactivity of CD4+ T cells was assessed by examining CD69 expression.

Main Results:

• OVA-specific CD4+ Foxp3+ regulatory T cells were found in both control and DSS-treated mice.
• OVA-specific CD4+ Foxp3- T cells were exclusively detected in mice treated with both OVA and DSS.
• These antigen-specific T cells were found systemically after the resolution of colitis.

Conclusions:

• DSS colitis can induce the development of T cells specific to oral antigens.
• These antigen-specific T cells are detectable systemically following colitis resolution.
• The DSS model offers enhanced utility for tracking T cells primed against luminal antigens in IBD research.