title: Protective effects of proanthocyanidins of grape (Vitis vinifera L.) seeds on DNA damage induced by Doxorubicin in somatic cells of Drosophila melanogaster.
abstract: Proanthocyanidins (PAs), also known as condensed tannins, are naturally occurring oligomers and polymers of flavan-3-ol monomer units widely found in the leaves, flowers, fruits, seeds, nuts and barks of many plants. Grape seed proanthocyanidins (GSPs) have been used as nutritional supplements, as antioxidants, in preventing atherosclerosis and cardiovascular diseases, and for dislipidemy treatment. The anthracycline antibiotic adriamycin (Doxorubicin, DXR) is a cancer chemotherapeutic agent that interferes with the topoisomerase II enzyme and generates free radicals. In the present study, GSPs (1.680, 3.375, or 6.750 mg/mL) alone were examined for genotoxicity, and combined with DXR (0.125 mg/mL) for antigenotoxicity, using the standard (ST) and high bioactivation (HB) versions of the wing somatic mutation and recombination test in Drosophila melanogaster. The results observed in both crosses were rather similar. GSPs themselves did not show genotoxicity at the doses used. GSPs suppressed the DNA damage induced by DXR in a dose-dependent manner. Comparison of the frequencies of wing spots in the marker-heterozygous (MH) flies and balancer-heterozygous (BH) flies from both crosses, indicated that induced recombination was the major response for the treatments with DXR alone. The co-treatments demonstrated that GSPs have some anti-mutagenic activity; however, anti-recombinagenic activity was the major response.
authors.affiliation: Universidade Federal de Uberlândia, Instituto de Genética e Bioquímica, Laboratório de Mutagênese, Av. Pará 1720, Campus Umuarama, 38400-902 Uberlândia, MG, Brazil.
authors.forename: Alexandre Azenha Alves
authors.initials: AA
authors.lastname: de Rezende
authors.forename: Ulrich
authors.initials: U
authors.lastname: Graf
authors.forename: Zaira da Rosa
authors.initials: Zda R
authors.lastname: Guterres
authors.forename: Warwick Estevam
authors.initials: WE
authors.lastname: Kerr
authors.forename: Mário Antônio
authors.initials: MA
authors.lastname: Spanó