title: Effects of bleomycin on Down's syndrome lymphocytes in culture.
abstract: Blood lymphocytes from 3 Down's syndrome (DS) and 3 age- and sex-matched normal probands were studied for the induction of chromosomal aberrations and sister-chromatid exchange (SCEs). Treatment with bleomycin (30 and 60 ng) at the initiation of culture showed a dose-dependent increase in the incidence of dicentric and ring chromosome aberrations. In contrast, the cells which were treated for the last 24 h in culture with bleomycin did not show an increase in chromosome-type aberrations. The proportion of metaphases in M1, M2, and M3 in cultures was not different between DS and normal cells. Sister-chromatid exchange frequency did not show significant changes between DS and normal individuals.
mesh_terms: D001761:Bleomycin / Q000494:pharmacology*; D002453:Cell Cycle / Q000187:drug effects; D002478:Cells, Cultured; D002869:Chromosome Aberrations; D004314:Down Syndrome / Q000473:pathology*; D006801:Humans; D008214:Lymphocytes / Q000187:drug effects* / Q000648:ultrastructure; D012303:Ring Chromosomes; D012854:Sister Chromatid Exchange / Q000187:drug effects*
chemical_list: D001761:Bleomycin