Environmental Enteric Dysfunction Induces Regulatory T cells That Inhibit Local CD4+ T cell Responses and Impair Oral Vaccine Efficacy

Overview

Journal Immunity

Publisher Cell Press

Specialty Allergy & Immunology

Date 2021 Aug 4

PMID 34348118

Citations 24

Authors

Amrita Bhattacharjee

Ansen H P Burr

Abigail E Overacre-Delgoffe

Justin T Tometich

Deyi Yang

Brydie R Huckestein

Jonathan L Linehan

Sean P Spencer

Jason A Hall

Oliver J Harrison

Denise Morais da Fonseca

Elizabeth B Norton

Yasmine Belkaid

Timothy W Hand

Affiliations

Soon will be listed here.

Abstract

Environmental enteric dysfunction (EED) is a gastrointestinal inflammatory disease caused by malnutrition and chronic infection. EED is associated with stunting in children and reduced efficacy of oral vaccines. To study the mechanisms of oral vaccine failure during EED, we developed a microbiota- and diet-dependent mouse EED model. Analysis of E. coli-labile toxin vaccine-specific CD4 T cells in these mice revealed impaired CD4 T cell responses in the small intestine and but not the lymph nodes. EED mice exhibited increased frequencies of small intestine-resident RORγTFOXP3 regulatory T (Treg) cells. Targeted deletion of RORγT from Treg cells restored small intestinal vaccine-specific CD4 T cell responses and vaccine-mediated protection upon challenge. However, ablation of RORγTFOXP3 Treg cells made mice more susceptible to EED-induced stunting. Our findings provide insight into the poor efficacy of oral vaccines in EED and highlight how RORγTFOXP3 Treg cells can regulate intestinal immunity while leaving systemic responses intact.

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