title: Characterization of the anti-stem cell activity of anti-mouse brain serum.
abstract: The anti-stem cell activity of a high-titer rabbit anti-mouse brain serum preparation has been further characterized. Following absorption with bone marrow and erythrocytes the antiserum had dose-dependent cytotoxicity against pluripotent stem cells. Rigorous absorptions with bone marrow, spleen, liver, erythrocytes, and thymus failed to remove the anti-stem cell activity of the serum. Adult brain, the immunogen, but not neonatal brain, removed a substantial amount of the activity against stem cells. Maximal cytotoxicity occurred both with and without complement and was maximal following only a 4 degrees C incubation of cells with serum. The anti-stem cell activity was present in the serum globulin fraction. No increase in the frequency of microcolonies or, with longer growth periods, in splenic macrocolonies was observed, suggesting that CFU-s were completely inactivated by exposure to the antiserum. Injected antiserum also reduced CFU-s in vivo.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000276:immunology; D001921:Brain / Q000276:immunology*; D002455:Cell Division; D002999:Clone Cells; D003601:Cytotoxicity Tests, Immunologic; D005260:Female; D006412:Hematopoietic Stem Cells / Q000276:immunology*; D007106:Immune Sera; D008099:Liver / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D013154:Spleen / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology
chemical_list: D007106:Immune Sera