title: In vivo dose-response relationship in bone-marrow cells of mice treated with adriamycin.
abstract: In bone-marrow cells of mice treated with a single dose of adriamycin and killed 6 h later, only chromatid-type aberrations were found. Animals studied 12 h after adriamycin injection showed chromatid- and chromosome-type aberrations, including Robertsonian centric fusions. The frequency of chromatid-type aberrations exhibited a direct-correlation with the dose in mice treated for 6 but not for 12 h. On the other hand, chromosome-type aberrations detected 12 h after injection were directly correlated with the dose of adriamycin. The induction in vivo of chromosome-type aberrations in mice studied 12 h after treatment suggests the existence of bone-marrow cell populations able to carry out 2 mitoses in this time lapse. The induction of Robertsonian fusions can be explained by the preferential induction of chromosomal lesions in pericentromeric heterochromatin followed by reunion of damaged segments of 2 chromosomes. Consequently, the metacentric-like chromosomes induced by adriamycin arise either from translocations involving entire chromosomes arms or from aberrations of the exchange type between 2 short arms of acrocentric chromosomes.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000187:drug effects; D001854:Bone Marrow Cells; D002842:Chromatids / Q000187:drug effects; D002869:Chromosome Aberrations; D004305:Dose-Response Relationship, Drug; D004317:Doxorubicin / Q000008:administration & dosage / Q000494:pharmacology*; D051379:Mice; D008807:Mice, Inbred BALB C; D009152:Mutagenicity Tests; D013997:Time Factors
chemical_list: D004317:Doxorubicin