Differential Regulation of IL-4Ralpha Expression by Antigen Versus Cytokine Stimulation Characterizes Th2 Progression in Vivo
Overview
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IL-4 promotes Th2 differentiation and provides immunity to helminth infections but is also associated with allergy and asthma. This suggests that precise adjustment of IL-4 responsiveness is needed to correctly balance immune responses. The IL-4Ralpha chain is an essential component of the IL-4 receptor and signals via STAT6. In this study, we show that infection with a helminth pathogen elicited broad upregulation of IL-4Ralpha on bystander CD4+ T cells in the draining lymph node, while simultaneously resulting in the loss of IL-4Ralpha expression on activated Th2 cells. IL-4Ralpha upregulation was restricted to the reactive lymph node, occurred within 4 d of infection, and was driven by an IL-4- and STAT6-dependent mechanism. Mice heterozygous for Stat6 exhibited reduced IL-4Ralpha upregulation and a correspondingly attenuated Th2 response. Indeed, the enhanced IL-4Ralpha upregulation in BALB/c mice, compared with that in C57BL6 mice, predicted their stronger Th2 response. The selective downregulation of IL-4Ralpha on highly activated Th cells was triggered by antigenic stimulation, was accompanied by loss of IL-7Ralpha, and rendered the cells unresponsive to IL-4. Together these data reveal a tightly controlled program of changing IL-4 responsiveness that characterizes the initiation, amplification, and restriction of a Th2 response in vivo.
Suppression of airway allergic eosinophilia by Hp-TGM, a helminth mimic of TGF-β.
Chauche C, Rasid O, Donachie A, McManus C, Loser S, Campion T Immunology. 2022; 167(2):197-211.
PMID: 35758054 PMC: 9885513. DOI: 10.1111/imm.13528.
Webster H, Gamino V, Andrusaite A, Ridgewell O, McCowan J, Shergold A Mucosal Immunol. 2022; 15(6):1257-1269.
PMID: 35428872 PMC: 9705258. DOI: 10.1038/s41385-022-00513-y.
Extrafollicular IgD+ B cells generate IgE antibody secreting cells in the nasal mucosa.
Corrado A, Ramonell R, Woodruff M, Tipton C, Wise S, Levy J Mucosal Immunol. 2021; 14(5):1144-1159.
PMID: 34050324 PMC: 8160425. DOI: 10.1038/s41385-021-00410-w.
Regulation of T Helper Cell Fate by TCR Signal Strength.
Bhattacharyya N, Feng C Front Immunol. 2020; 11:624.
PMID: 32508803 PMC: 7248325. DOI: 10.3389/fimmu.2020.00624.
Expression Efficiency of Multiple Reporter Alleles Is Determined by Cell Lineage.
Kharwadkar R, Ulrich B, Abdul Qayum A, Koh B, Licona-Limon P, Flavell R Immunohorizons. 2020; 4(5):282-291.
PMID: 32439753 PMC: 7678022. DOI: 10.4049/immunohorizons.1900082.