title: Survival of erythroid burst-forming units and erythroid colony-forming units in canine bone marrow cells exposed in vitro to 1 MeV neutron radiation or X rays.
abstract: Conditioned media (CM) from allogeneic stimulated cultures of light density cells (less than 1.08 g/cm3) from the peripheral blood of normal dogs were used to stimulate the growth of erythroid burst-forming units (BFU-E) in bone marrow from normal dogs. Maximum numbers of BFU-E were obtained when 5% (vol/vol) 3 X CM and 2 U/ml erythropoietin were added to plasma clot cultures of bone marrow cells. In addition, the radiation sensitivity (D0 value) was determined for CFU-E and for BFU-E in bone marrow cells exposed in vitro to 1 MeV fission neutron radiation or 250 kVp X rays. BFU-E were more sensitive than CFU-E to the lethal effects of both types of radiation. For bone marrow cells exposed to 1 MeV neutron radiation, the D0 for CFU-E was 0.27 +/- 0.01 Gy, and the D0 for BFU-E was 0.16 +/- 0.03 Gy. D0 values for CFU-E and BFU-E were, respectively, 0.61 +/- 0.05 Gy and 0.26 +/- 0.09 Gy for cells exposed to X rays. The neutron RBE values for the culture conditions described were 2.3 +/- 0.01 for CFU-E and 1.6 +/- 0.40 for BFU-E.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000528:radiation effects; D001854:Bone Marrow Cells; D002470:Cell Survival / Q000528:radiation effects; D002478:Cells, Cultured; D003470:Culture Media; D004285:Dogs; D004920:Erythropoiesis / Q000528:radiation effects*; D005260:Female; D006412:Hematopoietic Stem Cells / Q000528:radiation effects*; D008297:Male; D009502:Neutrons; D011836:Radiation Tolerance; D014965:X-Rays
chemical_list: D003470:Culture Media