4.6 Article

Group 3 innate lymphoid cells regulate neutrophil migration and function in human decidua

Journal

MUCOSAL IMMUNOLOGY
Volume 9, Issue 6, Pages 1372-1383

Publisher

NATURE PUBLISHING GROUP
DOI: 10.1038/mi.2016.10

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Funding

  1. Associazione Italiana Ricerca sul Cancro (AIRC): IG project [10225, 15283, IG-15454]
  2. AIRC
  3. Associazione Italiana Ricerca sul Cancro (AIRC): Special Program Molecular Clinical Oncology 5x1000 project [9962]

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Innate lymphoid cells (ILCs) have a central role in innate defenses against pathogens, lymphoid organogenesis, and tissue remodeling. They have been detected in human decidua, however, their role in this tissue remains unclear. Successful pregnancy requires an early inflammatory phase favoring implantation and tissue remodeling as well as a subsequent regulatory phase to prevent fetal rejection and supporting neoangiogenesis. Here, we show that, during the first trimester of pregnancy, neutrophils infiltrate decidua basalis and are more abundant in normal pregnancy than in spontaneous miscarriages. Decidual neutrophils localize in proximity of NCR(+)ILC3, which may influence neutrophil migration and survival given their production of CXCL8 and granulocyte macrophage colony-stimulating factor (GM-CSF). Moreover, NCR(+)ILC3-derived GM-CSF was found to induce the expression of heparin-binding EGF-like growth factor and IL1ra in neutrophils, two proteins/cytokines involved in tissue remodeling and maintenance of pregnancy. Our data suggest that the simultaneous presence of NCR(+)ILC3 and neutrophils in decidual tissues and their possible cross talk, may have a role in the early phases of pregnancy.

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