Abstract
We analyzed the chromosomal aberrations involving telomeres in the progeny of mammalian cells exposed to the radiomimetic compound bleomycin (BLM) in order to determine if this antineoplastic drug induces long-term telomere instability. To this end, rat cells (ADIPO-P2 cell line, derived from adipose cells from Sprague-Dawley rat) were treated with a single concentration of BLM (2.5 μg/ml), and chromosomal aberrations were analyzed 18 h and 10 days after treatment by using PNA-FISH with a pan-telomeric probe [(TTAGGG)n repeats]. Cytogenetic analysis revealed a higher frequency of aberrations at 18 h and 10 days after treatment in BLM-exposed cultures vs. untreated cultures, although the yield of BLM-induced aberrations 10 days after treatment decreased about 25% compared with the one at 18 h after treatment. Moreover, the level of telomerase activity in BLM-treated cells compared with that of untreated control cells was significantly higher at 10 days after treatment, but did not differ at 18 h after treatment. These data indicate that in terms of unstable aberrations, the in vitro clastogenic effect of BLM on ADIPO-P2 cells persists for at least 10 days after exposure. In addition, our data demonstrate, for the first time, tha...Continue Reading
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Jan 11, 2014·Mutation Research. Fundamental and Molecular Mechanisms of Mutagenesis·Natalia S PavioloAlejandro D Bolzán
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