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2017 ; 139
(5
): 1468-1477.e2
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Type 2 innate lymphoid cell suppression by regulatory T cells attenuates airway
hyperreactivity and requires inducible T-cell costimulator-inducible T-cell
costimulator ligand interaction
#MMPMID27717665
Rigas D
; Lewis G
; Aron JL
; Wang B
; Banie H
; Sankaranarayanan I
; Galle-Treger L
; Maazi H
; Lo R
; Freeman GJ
; Sharpe AH
; Soroosh P
; Akbari O
J Allergy Clin Immunol
2017[May]; 139
(5
): 1468-1477.e2
PMID27717665
show ga
BACKGROUND: Atopic diseases, including asthma, exacerbate type 2 immune responses
and involve a number of immune cell types, including regulatory T (Treg) cells
and the emerging type 2 innate lymphoid cells (ILC2s). Although ILC2s are potent
producers of type 2 cytokines, the regulation of ILC2 activation and function is
not well understood. OBJECTIVE: In the present study, for the first time, we
evaluate how Treg cells interact with pulmonary ILC2s and control their function.
METHODS: ILC2s and Treg cells were evaluated by using in vitro suppression
assays, cell-contact assays, and gene expression panels. Also, human ILC2s and
Treg cells were adoptively transferred into NOD SCID ?C-deficient mice, which
were given isotype or anti-inducible T-cell costimulator ligand (ICOSL)
antibodies and then challenged with IL-33 and assessed for airway
hyperreactivity. RESULTS: We show that induced Treg cells, but not natural Treg
cells, effectively suppress the production of the ILC2-driven proinflammatory
cytokines IL-5 and IL-13 both in vitro and in vivo. Mechanistically, our data
reveal the necessity of inducible T-cell costimulator (ICOS)-ICOS ligand cell
contact for Treg cell-mediated ILC2 suppression alongside the suppressive
cytokines TGF-? and IL-10. Using a translational approach, we then demonstrate
that human induced Treg cells suppress syngeneic human ILC2s through ICOSL to
control airway inflammation in a humanized ILC2 mouse model. CONCLUSION: These
findings suggest that peripheral expansion of induced Treg cells can serve as a
promising therapeutic target against ILC2-dependent asthma.