title: Tolerance signaling molecules.
abstract: Mechanisms explaining maternal tolerance of her semiallogeneic histoincompatible fetus have been proposed to include a number of unique signaling molecules including CD200, novel MHC class I-b molecules such as HLA-G and HLA-E, Th2,3 cytokines, apoptosis-inducing molecules such as FASL, and indoleamine 2,3-dioxygenase. Novel CD4+ CD25+ Treg cells and gammadelta T cell receptor-positive regulatory cells appear to play key roles in responding to and in generating signals. This chapter will critically review current data concerning the mechanisms and relevance of the various proposed mechanisms.
authors.affiliation: McMaster University, Hamilton, Canada.
authors.forename: David A
authors.initials: DA
authors.lastname: Clark
mesh_terms: D000818:Animals; D015703:Antigens, CD; D000954:Antigens, Surface / Q000378:metabolism; D017209:Apoptosis / Q000276:immunology; D005260:Female; D006680:HLA Antigens / Q000378:metabolism; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I / Q000378:metabolism; D006801:Humans; D007108:Immune Tolerance; D007113:Immunity, Innate; D008431:Maternal-Fetal Exchange / Q000276:immunology*; D051379:Mice; D018448:Models, Immunological; D064446:Orexin Receptors; D011247:Pregnancy; D011956:Receptors, Cell Surface / Q000378:metabolism; D015398:Signal Transduction / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology; D014366:Tryptophan Oxygenase / Q000276:immunology; D000097625:HLA-E Antigens
chemical_list: D015703:Antigens, CD; D000954:Antigens, Surface; D006680:HLA Antigens; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I; D064446:Orexin Receptors; D011956:Receptors, Cell Surface; D014366:Tryptophan Oxygenase; D000097625:HLA-E Antigens; C477337:CD200R1 protein, human; C501103:Cd200r1 protein, mouse; C042739:antigens, CD200