title: Continued cell cycling ability of HL-60 cells following 3HaraC incorporation: a combination of "double-labeling" and sister chromatid analysis.
abstract: This study was designed to determine if HL-60 cells could undergo one or more cycles of DNA synthesis despite containing 3H-cytosine arabinoside (3HaraC) in their genome. HL-60 cells were incubated with 3HaraC for 2 hours, washed and maintained in a medium containing bromodeoxyuridine (BrdU). At fixed time points, cells were arrested in metaphase and prepared for chromosomal analysis. Treatment of the sample by an immunofluorescent monoclonal anti-BrdU antibody allowed us to determine the differential fluorescent pattern of sister chromatids in metaphase cells that had undergone two or more rounds of DNA synthesis in the presence of BrdU. Processing the samples by autoradiography demonstrated the presence of black grains (3HaraC) overlying the chromosomes. Thus, we were able to examine each metaphase for the presence of 3HaraC as well as the number of cycles it had completed in the presence of BrdU. We showed that despite the presence of 3HaraC in their DNA, some HL-60 cells were able to undergo two or more complete rounds of DNA replication.
mesh_terms: D001345:Autoradiography; D002453:Cell Cycle / Q000187:drug effects*; D002460:Cell Line; D003561:Cytarabine / Q000494:pharmacology*; D004247:DNA / Q000096:biosynthesis; D006801:Humans; D007621:Karyotyping; D012854:Sister Chromatid Exchange / Q000187:drug effects*; D013194:Staining and Labeling
chemical_list: D003561:Cytarabine; D004247:DNA