title: BrdU-Hoechst flow cytometry reveals regulation of human lymphocyte growth by donor-age-related growth fraction and transition rate.
abstract: An improved BrdU-Hoechst flow assay was applied to cell kinetic studies of human lymphocyte cultures during a 24-96 hr interval after PHA stimulation. The assay shows that the duration of the initial lag phase and the proportions of noncycling cells increase as a function of donor age, whereas the rates of transition from each cell cycle compartment to the next decrease. Cell cycle arrest occurs in the first S and G2 phase after stimulation of lymphocytes from a 75-year-old donor but not from younger donors. The data are consistent with several models of cell cycle kinetics, so long as these models are modified to include a fraction of noncycling cells in each cell cycle compartment.
mesh_terms: D000375:Aging; D001782:Blood Donors; D001973:Bromodeoxyuridine; D002453:Cell Cycle / Q000187:drug effects; D002455:Cell Division; D004305:Dose-Response Relationship, Drug; D005434:Flow Cytometry / Q000379:methods*; D006801:Humans; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000166:cytology*; D008954:Models, Biological; D010835:Phytohemagglutinins
chemical_list: D010835:Phytohemagglutinins; D001973:Bromodeoxyuridine