MHC Class II Antigen Presentation in Intestinal Epithelial Cells
Summary
Intestinal epithelial cells (IECs) are more than a passive barrier; they serve as non-professional antigen-presenting cells by expressing major histocompatibility complex class II (MHC class II) molecules and associated processing machinery. Under homeostatic conditions, interferon-γ and microbial cues drive the class II transactivator (CIITA) to orchestrate transcription of MHC class II genes. This enables IECs to sample luminal antigens—ranging from dietary proteins to commensal and pathogenic microbes—and present peptide fragments to CD4+ T cells within the mucosal immune compartment. Through this pathway, IECs contribute to oral tolerance by fostering regulatory T-cell responses and, conversely, reinforce protective immunity by activating effector/helper T-cell subsets. Epigenetic factors such as histone deacetylase 3 (HDAC3), cytokines including IL-22, and microbial metabolites finely tune MHC class II expression to maintain the balance between tolerance and inflammation. Dysregulation of epithelial antigen presentation has been implicated in inflammatory bowel disease and impaired mucosal defence, making IEC MHC class II a focus for novel therapeutic strategies aimed at restoring immune homeostasis and enhancing barrier function.
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MHC Class II Antigen Presentation in Intestinal Epithelial Cells publication trend
The graph below shows the total number of articles in mhc class ii antigen presentation in intestinal epithelial cells across all publications each year (not limited to Nature Index journals).
Technical terms
Major histocompatibility complex class II (MHC class II): Surface glycoprotein complex that presents extracellularly derived peptide antigens to CD4+ T cells.
Intestinal epithelial cells (IECs): Specialized monolayer lining the gut lumen, responsible for nutrient absorption, barrier integrity and immune interactions.
Antigen presentation: The process by which peptide fragments are loaded onto MHC molecules for recognition by T-cell receptors.
Class II transactivator (CIITA): Master transcription factor that regulates expression of MHC class II genes in response to cytokine and microbial signals.
Regulatory T cells (Tregs): Subset of CD4+ T cells that suppress excessive immune activation and maintain mucosal tolerance.
References
- Intestinal epithelial HDAC3 and MHC class II coordinate microbiota-specific immunity. Journal of Clinical Investigation (2023).
- Interleukin-22 suppresses major histocompatibility complex II in mucosal epithelial cells. Journal of Experimental Medicine (2023).
- MHC class II antigen presentation by intestinal epithelial cells fine-tunes bacteria-reactive CD4 T-cell responses. Mucosal Immunology (2023).
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