title: Regulation of pregnancy maintenance and fetal survival in mice by CD27(low) mature NK cells.
abstract: Uterine natural killer (NK) cells are pivotal for successful mammalian reproduction. However, insights on functionally distinct subpopulations of uterine NK cells are largely elusive. Furthermore, translation of findings from murine into human pregnancy has been overshadowed by the limited number of mutual phenotypic NK cell markers. We here provide evidence that a subset of murine mature NK (mNK) cells present at the feto-maternal interface, identified as CD27(low)DX5(+)CD3(neg), is pivotal in maintaining pregnancy. This mNK subset has low cytotoxic capacity, produces higher amounts of interferon (IFN)-γ, and expresses functional homologs of human NK cell immunoglobulin-like receptors. We further show that bone marrow-derived CD27(low) mNK cells are selectively recruited to the uterus and ameliorate the rate of fetal loss when adoptively transferred into alymphoid RAG2(-/-)/γc(-/-) mice. Additionally, expression of CD27 is down-modulated on mNK cells upon migration to the uterus. Hence, we propose the existence of a regulatory mNK cell subset, which is licensed toward successful pregnancy maintenance at the fetomaternal interface in mice. As CD27(low) NK cells are also present in human decidua, the CD27(low) NK subset may provide a tool to foster translational research in reproduction, aiming to improve pregnancy outcome in humans.
authors.affiliation: Brain Body Institute, Department of Medicine, McMaster University, Hamilton, Canada. karimik@mcmaster.ca
authors.forename: Khalil
authors.initials: K
authors.lastname: Karimi
authors.forename: María Emilia
authors.initials: ME
authors.lastname: Solano
authors.forename: Ali A
authors.initials: AA
authors.lastname: Ashkar
authors.forename: Huang
authors.initials: H
authors.lastname: Ho
authors.forename: Eva-Maria
authors.initials: EM
authors.lastname: Steidle
authors.forename: Karen-Anne
authors.initials: KA
authors.lastname: McVey Neufeld
authors.forename: Kurt
authors.initials: K
authors.lastname: Hecher
authors.forename: John
authors.initials: J
authors.lastname: Bienenstock
authors.forename: Petra Clara
authors.initials: PC
authors.lastname: Arck
mesh_terms: D000818:Animals; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D011070:Poly I-C / Q000276:immunology; D011247:Pregnancy; D011255:Pregnancy Maintenance; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000276:immunology*; D014599:Uterus / Q000276:immunology
chemical_list: D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D007371:Interferon-gamma; D011070:Poly I-C