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IL-15 sustains IL-7R-independent ILC2 and ILC3 development.


ABSTRACT: The signals that maintain tissue-resident innate lymphoid cells (ILC) in different microenvironments are incompletely understood. Here we show that IL-7 receptor (IL-7R) is not strictly required for the development of any ILC subset, as residual cells persist in the small intestinal lamina propria (siLP) of adult and neonatal Il7ra-/- mice. Il7ra-/- ILC2 primarily express an ST2- phenotype, but are not inflammatory ILC2. CCR6+ ILC3, which express higher Bcl-2 than other ILC3, are the most abundant subset in Il7ra-/- siLP. All ILC subsets are functionally competent in vitro, and are sufficient to provide enhanced protection to infection with C. rodentium. IL-15 equally sustains wild-type and Il7ra-/- ILC survival in vitro and compensates for IL-7R deficiency, as residual ILCs are depleted in mice lacking both molecules. Collectively, these data demonstrate that siLP ILCs are not completely IL-7R dependent, but can persist partially through IL-15 signalling.

SUBMITTER: Robinette ML 

PROVIDER: S-EPMC5380969 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

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IL-15 sustains IL-7R-independent ILC2 and ILC3 development.

Robinette Michelle L ML   Bando Jennifer K JK   Song Wilbur W   Ulland Tyler K TK   Gilfillan Susan S   Colonna Marco M  

Nature communications 20170331


The signals that maintain tissue-resident innate lymphoid cells (ILC) in different microenvironments are incompletely understood. Here we show that IL-7 receptor (IL-7R) is not strictly required for the development of any ILC subset, as residual cells persist in the small intestinal lamina propria (siLP) of adult and neonatal Il7ra<sup>-/-</sup> mice. Il7ra<sup>-/-</sup> ILC2 primarily express an ST2<sup>-</sup> phenotype, but are not inflammatory ILC2. CCR6<sup>+</sup> ILC3, which express highe  ...[more]

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