Oral Tolerance in the Absence of Naturally Occurring Tregs
Overview
Authors
Affiliations
Mucosal tolerance prevents pathological reactions against environmental and food antigens, and its failure results in exacerbated inflammation typical of allergies and asthma. One of the proposed mechanisms of oral tolerance is the induction of Tregs. Using a mouse model of hyper-IgE and asthma, we found that oral tolerance could be effectively induced in the absence of naturally occurring thymus-derived Tregs. Oral antigen administration prior to i.p. immunization prevented effector/memory Th2 cell development, germinal center formation, class switching to IgE, and lung inflammation. Oral exposure to antigen induced development of antigen-specific CD4CD25Foxp3CD45RB cells that were anergic and displayed suppressive activity in vivo and in vitro. Oral tolerance to the Th2 allergic response was in large part dependent on TGF-beta and independent of IL-10. Interestingly, Tregs were also induced by single i.p. immunization with antigen and adjuvant. However, unlike oral administration of antigen, which induced Tregs but not effector T cells, i.p. immunization led to the simultaneous induction of Tregs and effector Th2 cells displaying the same antigen specificity.
The renaissance of oral tolerance: merging tradition and new insights.
Cerovic V, Pabst O, Mowat A Nat Rev Immunol. 2024; 25(1):42-56.
PMID: 39242920 DOI: 10.1038/s41577-024-01077-7.
Blanco T, Nakagawa H, Musayeva A, Krauthammer M, Singh R, Narimatsu A JCI Insight. 2024; 9(20).
PMID: 39235864 PMC: 11530131. DOI: 10.1172/jci.insight.182469.
Prdm16-dependent antigen-presenting cells induce tolerance to intestinal antigens.
Fu L, Upadhyay R, Pokrovskii M, Chen F, Romero-Meza G, Griesemer A bioRxiv. 2024; .
PMID: 39091750 PMC: 11291166. DOI: 10.1101/2024.07.23.604803.
Oral tolerance to dietary antigens and Foxp3 regulatory T cells.
Miranda-Waldetario M, Curotto de Lafaille M Immunol Rev. 2024; 326(1):8-16.
PMID: 39054615 PMC: 11436310. DOI: 10.1111/imr.13370.
Discovery and characterization of dietary antigens in oral tolerance.
Blum J, Kong R, Schulman E, Chen F, Upadhyay R, Romero-Meza G bioRxiv. 2024; .
PMID: 38853977 PMC: 11160622. DOI: 10.1101/2024.05.26.593976.