title: Distribution and virogenic effects of 5-bromodeoxyuridine in synchronized rat embryo cells.
abstract: Rat embryo cell cultures were synchronized by a double thymidine block. The DNA replication phase (S) was divided into an early, middle, and late period. Cell cultures in the early, middle, or late S phase were pulsed with 0.1 muM 5-bromo[(3)H]deoxyuridine (BrdU) or equimolar [(3)H]dT. DNA-DNA reassociation experiments of each sample revealed that [(3)H]BrdU was more concentrated in the intermediate repetitive than the repetitive or unique DNA sequences of the early and middle S phase. In contrast, [(3)H]dT was nearly uniformly jistributed throughout all nucleotide sequences during the entire S phase. synchronized rat cells were pulsed during various portions of the S phase with unlabeled 0.1 mM or 0.1 muM BrdU and examined for sytoplasmic immumofluorescence against the 30,000 molecular weight group-specific antigen (p30) of Friend mouse leukemia virus. Equally strong fluorescence was detected 12 hr later in cells treated with each concentration of BrdU. Furthermore, incorporation of BrdU during late S phase was suffieient to elicit maximal antigen expression.
mesh_terms: D000818:Animals; D000956:Antigens, Viral / Q000032:analysis; D001973:Bromodeoxyuridine / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D002845:Chromatography; D004247:DNA / Q000096:biosynthesis*; D004261:DNA Replication / Q000187:drug effects*; D005622:Friend murine leukemia virus / Q000276:immunology / Q000378:metabolism*; D007700:Kinetics; D009695:Nucleic Acid Renaturation; D051381:Rats / Q000196:embryology; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000956:Antigens, Viral; D004247:DNA; D001973:Bromodeoxyuridine