title: The use of hydroxyurea to study the proliferative state of T-cell precursors (CFUT) in murine bone marrow.
abstract: The cycle specific drug, hydroxyurea (HU), has previously been used to study the proliferative kinetics of various hemopoietic precursor cells such as granulocyte-macrophage precursors (CFUc) and multipotential stem cells (CFUs). We have investigated the kinetics of another hemopoietic precursor, a T-cell colony (CFUT). When mice are exposed to two doses of HU, separated by 7 h, CFUT are reduced to approximately 30% of the control value. Surviving cells in the bone marrow quickly replenish the population and return it to normal values 2 days after HU treatment. When fresh bone marrow cells or bone marrow cells harvested from mice exposed 24 h earlier to HU are treated in vitro with HU, CFUT activity is reduced by approximately 70%. These data indicate that CFUT is a rapidly proliferating population with a large proportion of the cells always in cell cycle.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology; D001854:Bone Marrow Cells; D002455:Cell Division / Q000187:drug effects; D003114:Colony-Forming Units Assay; D006918:Hydroxyurea / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D013601:T-Lymphocytes / Q000166:cytology*
chemical_list: D006918:Hydroxyurea