title: Effect of graft-versus-host reaction on the immune response to alloantigens and growth of a syngeneic tumor.
abstract: The graft-versus-host reaction (GVHR) was evoked in (C57BL/6J times C3H/6J times DBA/2J) F1 hybrids by grafting parental lymphoid cells. Groups of bothe F1 hybrids were immunized with thymocytes carrying Thy-1.1 (theta AKR) antigen and still other groups of (C57BL/6J times C3H/HeJ) F1 hybrids were immunized with thymocytes carrying the H-2-d antigen. Plaque-forming cells (PFC) producing antibodies to the Thy-1.1 antigen, lytic for AKR thymocytes, or antibodies to the H-2-d antigen, lytic for lymphoblasts carrying the H-2-d antigens, were enumerated in spleens of experimental animals. A pronounced suppression of the immune response to the Thy-1.1 antigen was found in animals suffering from GVHR. The suppression could be demonstrated in some animals as late as 180 days after the onset of GVHR. Significant, although less pronounced suppression was found when response to the H-2-d antigens was assayed. After grafting 10-3 or 10-4 DBA/2J derived lymphoma cells (L5178Y) into (C57BL/6J times DBA/2J) F1 hybrids, clinically detectable tumor growth was found earlier and more frequently in hybrids suffering from GVHR than in control animals. The results obtained lend support to the concept that immunosuppression accompanying GVHR may influence the formation and/or growth of the malignant tumors. In addition, a synergistic effect in the suppression of the responsiveness of F1 recipients was seen in some instances when a mixture of parental bone marrow and thymus cells was grafted. The results are consistent with data indicating that more than one cell type is involved in the initiation of GVHR.
mesh_terms: D000818:Animals; D000918:Antibody Specificity; D000921:Antibody-Producing Cells; D005260:Female; D006087:Graft vs Host Reaction; D006462:Hemolytic Plaque Technique; D007109:Immunity; D007165:Immunosuppression Therapy; D007518:Isoantibodies; D007519:Isoantigens; D008221:Lymphoid Tissue / Q000276:immunology*; D008223:Lymphoma / Q000276:immunology*; D051379:Mice; D008806:Mice, Inbred AKR; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D009374:Neoplasms, Experimental / Q000276:immunology; D013154:Spleen / Q000166:cytology / Q000276:immunology; D013601:T-Lymphocytes / Q000637:transplantation; D014184:Transplantation, Homologous
chemical_list: D007518:Isoantibodies; D007519:Isoantigens