Microfold cell-dependent antigen transport alleviates infectious colitis by inducing antigen-specific cellular...

Area of Science:

• Immunology
• Gastroenterology
• Microbiology

Background:

• Infectious colitis is a prevalent global health concern.
• Microfold (M) cells are known to transport antigens for IgA responses, but their role in cellular immunity is unclear.

Purpose of the Study:

• To investigate the role of M cells in the induction of cellular immune responses against gut commensals.
• To determine if M cell function is essential for preventing bacterial dissemination during infection.

Main Methods:

• Utilized M cell-null mice to assess the impact of M cell absence on immune responses.
• Analyzed the induction of Th1, Th17, and Th22 responses in the gut.
• Evaluated bacterial dissemination and mucosal barrier function during Citrobacter rodentium infection.

Main Results:

• M cell-dependent antigen transport is critical for inducing Th1, Th17, and Th22 responses against gut commensals.
• M cell-null mice exhibited severe colitis, increased bacterial dissemination, and mucosal barrier dysfunction.
• Commensal-specific cellular immunity, dependent on M cells, is necessary to prevent pathogen spread.

Conclusions:

• M cells play a key role in initiating cellular immunity in the gut.
• M cell function is essential for maintaining gut immune homeostasis and preventing infectious colitis.