PERSISTENT GENETIC DAMAGE INDUCED BY TOPOISOMERASE II POISONS IN NORMAL HUMAN FIBROBLASTS: GENERATION OF CHROMOSOME INSTABILITY

DE CAMPOS NEBEL M; GONZALEZ-CID M; PALMITELLI M; ACEVEDO S

Basic and Applied Genetics

SOCIEDAD ARGENTINA DE GENÉTICA

Lugar: Buenos Aires; Año: 2016 vol. XXVI p. 25 - 35

1666-0390

Topoisomerase II (Top2) poisons idarubicin (IDA) and etoposide (ETO) are anticancer drugs that target Top2 stabilizing DNA-enzymecomplexes and generating double-strand breaks (DSB). These DNA lesions are dangerous because they lead to genomic instability and promotetumorigenesis. These drugs are associated with the development of leukemias characterized by translocations of the MLL gene in treated patients.Our aim was to analyze the residual genetic damage induced by IDA and ETO in normal human fibroblasts at different times. Cells were treatedwith sublethal concentrations of IDA and ETO for 2 h and persistent DSB were evaluated in interphase nuclei and chromosomal aberrations (CA)in metaphase at 26 h post-treatment. In addition, micronuclei and MLL gene rearrangements were determined in interphase nuclei at 30 h posttreatment.Unrepaired persistent DSB induced by IDA and ETO turned into chromatid and chromosome breaks and improper repair in chromatidand chromosome exchanges. Simultaneously with increased CA, there was a marked reduction of the mitotic index, principally in cultures treatedwith IDA, due to the accumulation of cells in G2/M phase of cell cycle. This chromosomal damage progressed to the following interphase causingan increase in the micronucleated cells and in the rearrangements of MLL gene. The persistent DNA damage produced by IDA and ETO in normalhuman cells plays an important role in the possible induction of Top2 poisons-mediated secondary malignancies.