GM-CSF is an essential regulator of T cell activation competence in uterine dendritic cells during early pregnancy in mice.
Uterine dendritic cells (DCs) are critical for activating the T cell response mediating maternal immune tolerance of the semiallogeneic fetus. GM-CSF (CSF2), a known regulator of DCs, is synthesized by uterine epithelial cells during induction of tolerance in early pregnancy. To investigate the role of GM-CSF in regulating uterine DCs and macrophages, Csf2-null mutant and wild-type mice were evaluated at estrus, and in the periconceptual and peri-implantation periods. Immunohistochemistry showed no effect of GM-CSF deficiency on numbers of uterine CD11c(+) cells and F4/80(+) macrophages at estrus or on days 0.5 and 3.5 postcoitum, but MHC class II(+) and class A scavenger receptor(+) cells were fewer. Flow cytometry revealed reduced CD80 and CD86 expression by uterine CD11c(+) cells and reduced MHC class II in both CD11c(+) and F4/80(+) cells from GM-CSF-deficient mice. CD80 and CD86 were induced in Csf2(-/-) uterine CD11c(+) cells by culture with GM-CSF. Substantially reduced ability to activate both CD4(+) and CD8(+) T cells in vivo was evident after delivery of OVA Ag by mating with Act-mOVA males or transcervical administration of OVA peptides. This study shows that GM-CSF regulates the efficiency with which uterine DCs and macrophages activate T cells, and it is essential for optimal MHC class II- and class I-mediated indirect presentation of reproductive Ags. Insufficient GM-CSF may impair generation of T cell-mediated immune tolerance at the outset of pregnancy and may contribute to the altered DC profile and dysregulated T cell tolerance evident in infertility, miscarriage, and preeclampsia.
Moldenhauer
Lachlan M
LM
Research Centre for Reproductive Health, School of Paediatrics and Reproductive Health, University of Adelaide, Adelaide, Australia.
Keenihan
Sarah N
SN
Hayball
John D
JD
Robertson
Sarah A
SA
D000595:Amino Acid Sequence; D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology / Q000378:metabolism; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism*; D004717:Endometrium / Q000196:embryology / Q000276:immunology / Q000378:metabolism; D018984:Epitopes, T-Lymphocyte / Q000276:immunology; D005260:Female; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D015395:Histocompatibility Antigens Class I / Q000378:metabolism; D000949:Histocompatibility Antigens Class II / Q000378:metabolism; D008213:Lymphocyte Activation / Q000276:immunology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D009928:Organ Specificity / Q000276:immunology; D011247:Pregnancy; D011257:Pregnancy Proteins / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism; D014599:Uterus / Q000196:embryology / Q000276:immunology* / Q000378:metabolism*
D018984:Epitopes, T-Lymphocyte; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D011257:Pregnancy Proteins; D016178:Granulocyte-Macrophage Colony-Stimulating Factor