title: Effects of placental extracts on the immune response to histocompatibility antigens: class deviation of alloantibody response and allograft enhancement.
abstract: Placental extracts obtained from CBA (H-2k) mice during syngeneic (CBA female X CBA male) pregnancy were evaluated for their capacity to deviate the immune reaction of CBA mice toward A/J(H-2a) immunizing spleen cells, as tested by alloantibody subclass formation and Sa 1 allograft accelerated rejection-or enhancement. The immunomodulatory activity appeared to be located in the soluble and in the insoluble extracts of placenta. The sodium deoxycholate (SDO) solubilized proteinic material, fractionated on Concanavalin A [Con A] and injected to CBA mice simultaneously with A/J spleen cells caused a suppression of the hemagglutinating titer and C-mediated cytotoxicity (IgG2). However, it also favoured antibody-mediated mast cell degranulation (IgG1) and Sa 1 allograft enhancement. The presence and role of IgG1 antibodies in both tumor enhancement and gestation has been described. It is concluded that placenta contains Con A-binding glycoproteins which are located in the membranes and released in soluble form. They exert their immunomodulatory effect in a way which might help the successful outcome of pregnancy as it helps to enhance the development of allografted sarcoma.
mesh_terms: D000818:Animals; D005260:Female; D006023:Glycoproteins / Q000276:immunology; D006183:H-2 Antigens / Q000276:immunology*; D007108:Immune Tolerance; D007074:Immunoglobulin G / Q000096:biosynthesis; D007518:Isoantibodies / Q000096:biosynthesis*; D051379:Mice; D008815:Mice, Inbred Strains; D009368:Neoplasm Transplantation; D010920:Placenta / Q000276:immunology*; D011247:Pregnancy; D012513:Sarcoma, Experimental / Q000276:immunology; D013154:Spleen / Q000276:immunology; D014181:Transplantation Immunology; D014184:Transplantation, Homologous
chemical_list: D006023:Glycoproteins; D006183:H-2 Antigens; D007074:Immunoglobulin G; D007518:Isoantibodies