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J Immunol. 2010 Jul 15;185(2):1177-85. doi: 10.4049/jimmunol.1000115. Epub 2010 Jun 21.

TLR5 signaling stimulates the innate production of IL-17 and IL-22 by CD3(neg)CD127+ immune cells in spleen and mucosa.

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  • 1Institut Pasteur de Lille, Centre d'Infection et d'Immunité de Lille, France.


In adaptive immunity, Th17 lymphocytes produce the IL-17 and IL-22 cytokines that stimulate mucosal antimicrobial defenses and tissue repair. In this study, we observed that the TLR5 agonist flagellin induced swift and transient transcription of genes encoding IL-17 and IL-22 in lymphoid, gut, and lung tissues. This innate response also temporarily enhanced the expression of genes associated with the antimicrobial Th17 signature. The source of the Th17-related cytokines was identified as novel populations of CD3(neg)CD127(+) immune cells among which CD4-expressing cells resembling lymphoid tissue inducer cells. We also demonstrated that dendritic cells are essential for expression of Th17-related cytokines and so for stimulation of innate cells. These data define that TLR-induced activation of CD3(neg)CD127(+) cells and production of Th17-related cytokines may be crucial for the early defenses against pathogen invasion of host tissues.

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