title: Effect of length of gestation on maternal cellular immunity to human trophoblast antigens.
abstract: Maternal lymphocyte reactivity to human trophoblast antigens was studied in placentas of gestational ages 8 to 14 weeks and 32 to 34 weeks, respectively. Significant trophoblast lysis became apparent after 24 hours' incubation in the latter case compared with a time lag of 72 hours in the terminated gestations. Maternal cellular immunity, therefore, was not detected during the first 3 1/2 months of pregnancy, but was detectable by the time of parturition. The possible significance is discussed with respect to the antigenic stimulus and survival of the fetal allograft.
mesh_terms: D000941:Antigens; D000961:Antilymphocyte Serum; D003601:Cytotoxicity Tests, Immunologic; D005260:Female; D005865:Gestational Age; D006801:Humans; D007111:Immunity, Cellular; D008214:Lymphocytes / Q000276:immunology; D008431:Maternal-Fetal Exchange; D010920:Placenta / Q000276:immunology; D011247:Pregnancy; D014327:Trophoblasts / Q000276:immunology*
chemical_list: D000941:Antigens; D000961:Antilymphocyte Serum