title: Relation between number of hemopoietic stem cells in newborn mice and their radiosensitivity.
abstract: Fractionation of a radiation exposure causes greater damage in newborn mice than a single application since it induces radioresistant foetal hemopoietic stem cells to differentiate prematurely to more radiosensitive adult ones. In the present investigation, it was studied whether other agents that give rise to extensive stem cell destruction also lead to such a change in radiosensitivity. Indeed, treatment with cytostatic drugs which reduces the number of spleen colony forming units (CFU-s) and total cells also diminished the D0 value of the surviving cells 3 days later. Adriamycin was most effective in causing damage to hemopoietic stem cells and in inducing micronuclei in bone marrow; it also had the most marked action on the D0 of the surviving stem cells.
mesh_terms: D000375:Aging; D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D000970:Antineoplastic Agents / Q000633:toxicity; D002467:Cell Nucleus / Q000187:drug effects / Q000528:radiation effects; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D003114:Colony-Forming Units Assay; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000473:pathology / Q000528:radiation effects*; D051379:Mice; D008810:Mice, Inbred C57BL; D011829:Radiation Dosage; D011836:Radiation Tolerance
chemical_list: D000970:Antineoplastic Agents