title: Primary and secondary antibody responses to sheep erythrocytes of allogeneic bone marrow chimeras histocompatible at the left or right one-half of the H-2 complex.
abstract: Employing a new and reproducible method for allogeneic bone marrow transplantation, two kinds of irradiation chimeras were prepared. A/J mice treated with C3H/He marrow cells, which were designated [C3H leads to A/J], where donor and recipient were matched at left one-half of the H-2 complex showed significant numbers of plaque forming cells (PFC) following primary immunization with SRBC, a T-dependent antigen. In contrast [BALB/c leads to A/J] chimeras where donor and recipient were matched at right one-half of the H-2 were unresponsive to SRBC. These results are quite concordant with our previous observations in which B10 H-2 recombinant mice and AKR were used as bone marrow donor and recipient respectively. The vigorous antibody responses after the second stimulation with SRBC, however, were seen in either [C3H leads to A/J] or [BALB/c leads to A/J] chimeras. Direct PFC responses in [BALB/c leads to A/J] chimeras were slightly higher than those of [C3H leads to A/J] chimeras or normal control mice, while indirect PFC responses in [BALB/c leads to A/J] chimeras were low compared to those of the latter groups of mice. These findings suggest that there might be a delay in initiating the response and switching from IgM to IgG production in the chimeras where donor and recipient differed at the left one-half of the H-2.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001853:Bone Marrow / Q000276:immunology*; D016026:Bone Marrow Transplantation; D002678:Chimera; D004912:Erythrocytes / Q000276:immunology; D006183:H-2 Antigens / Q000276:immunology*; D008214:Lymphocytes / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D012756:Sheep / Q000276:immunology
chemical_list: D006183:H-2 Antigens