title: Activation of leukemia viruses by graft-versus-host and mixed lymphocyte reactions in vitro.
abstract: Spleen cells from BALB/c or CAF(1) mice released little or no detectable leukemia virus when cultured 2-7 days in vitro. In contrast, spleen cells of CAF(1) mice previously inoculated with parental BALB/c spleen cells released leukemia viruses in 10 of 11 cases studied. Cultures of a mixture of spleen cells from normal BALB/c and CAF(1) mice also contained leukemia viruses. Phytohemagglutinin induced the transformation of lymphocytes in cultures of CAF(1) or BALB/c spleen cells, but this transformation did not activate leukemia viruses. It is concluded that mixed lymphocyte cultures in vitro, just as graft-versus-host reactions in vivo, can activate leukemia viruses that are normally present in a repressed form. This activation is not solely a function of lymphocyte transformation. The activated mouse leukemia virus may subsequently account for the observed high incidence of neoplasia in graft-versus-host disease.
mesh_terms: D000818:Animals; D002471:Cell Transformation, Neoplastic / Q000187:drug effects; D002478:Cells, Cultured / Q000276:immunology; D006087:Graft vs Host Reaction; D037102:Lectins / Q000494:pharmacology; D009052:Leukemia Virus, Murine / Q000276:immunology*; D008214:Lymphocytes / Q000276:immunology*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D008937:Mitomycins; D013045:Species Specificity; D013154:Spleen / Q000276:immunology
chemical_list: D037102:Lectins; D008937:Mitomycins