title: Cell kinetics of erythroid colony-forming cells (CFU-E) studied by hydroxyurea injections and sedimentation velocity profile.
abstract: Cell kinetic characteristics of murine CFU-E were assessed by measuring femoral marrow CFU-E survival rates after injection of hydroxyurea at from 2 to 48 h before marrow collection. The results are compatible with the concept that the CFU-E represent a homogeneous non-selfsustaining population comprised of cells belonging to a single differentiation stage. Their cell cycle length was estimated to be 10 h. Marrow cells were also subjected to separation by velocity sedimentation, and the effect of preceding hydroxyurea injections on the distribution profile of CFU-E was ascertained. Variations in cell size of CFU-E were interpreted to represent CFU-E in various phases of their cell cycle. CFU-E in either G1, S or G2 at the time of their removal from the marrow were capable of forming erythroid colonies in vitro, but it appears that the CFU-E lost this capacity after completing their cell cycle within the marrow of the intact mouse.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000187:drug effects; D001854:Bone Marrow Cells; D002455:Cell Division / Q000187:drug effects*; D002469:Cell Separation; D002470:Cell Survival / Q000187:drug effects*; D002999:Clone Cells; D003470:Culture Media; D004305:Dose-Response Relationship, Drug; D006918:Hydroxyurea / Q000008:administration & dosage / Q000494:pharmacology*; D051379:Mice
chemical_list: D003470:Culture Media; D006918:Hydroxyurea