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Proinflammatory environment dictates the IL-17-producing capacity of human invariant NKT cells

Lúcia Moreira-Teixeira1, Mariana Resende, Maryaline Coffre

  • 1Université Paris Descartes, Centre National de la Recherche Scientifique Unité Mixte de Recherche 8147, Hôpital Necker Enfants Malades, 75015 Paris, France.

Journal of Immunology (Baltimore, Md. : 1950)
|April 12, 2011
PubMed

CD1d-reactive invariant NKT (iNKT) cells have been implicated in a number of experimental models of human pathologies. Given the scope of their immunoregulatory activities mediated through distinct cytokine patterns, it has been proposed that this functional diversity originates from distinct iNKT subpopulations. In this study, we report that human CD161(+) iNKT cells are intrinsically endowed with the capacity to generate IL-17, but require TGF-β, IL-1β, and IL-23 to carry out this potential. IL-17-producing iNKT cells are already present in cord blood but, in contrast to peripheral blood iNKT cells, they cannot generate IFN-γ. These IL-17 producers respond to aryl hydrocarbon receptor stimulation and express IL-23 receptor and retinoic acid-related orphan receptor C, similar to conventional T helper 17 cells, from which they differ by their restricted ability to coproduce IL-22. In conclusion, IL-17 production by human iNKT cells depends on two critical parameters, namely an intrinsic program and a proinflammatory environment.

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