title: The methyl donor S-adenosylmethionine potentiates doxorubicin effects on apoptosis of hormone-dependent breast cancer cell lines.
abstract: In this work, we have investigated the antiproliferative effect of AdoMet and Doxorubicin (Doxo), alone or in combination, on different breast cancer cell lines. For the evaluation of synergism, we have calculated the combination index (CI) by the Calcusyn software and we have evaluated the effects of the combination on apoptosis occurrence at FACS analysis in hormone-dependent CG5 cell line. We have found that AdoMet and Doxo given in combination were strongly synergistic in the hormone-dependent CG5 and MCF-7 human breast cancer cell line, as a CI50 < 0.5 was found after 72 h of treatment while the effect was only additive in hormone-independent MDA-MB 231 cells. On the basis of our results, we have selected a combination of AdoMet and Doxo, that was highly synergistic and we have found that the AdoMet in combination with Doxo increased apoptosis induced by Doxo alone, suggesting that the synergism on growth inhibition was largely due to apoptosis. Notably, the AdoMet/Doxo combination induced a significant activation of caspases 3, and 8, while no effect was found on caspase 9 cleavage. In contrast, no significant changes of the expression of cleaved caspase 8 and 9 were found in cells treated with AdoMet and Doxo alone. Moreover, the combination induced a significant increase of Fas and FasL expression. These results highlight the importance of the synergistic effect of AdoMet with Doxo in the regulation of hormone-dependent breast cancer cell proliferation and emphasize the anti-tumor activity of these molecules.
authors.affiliation: Department of Biochemistry, Biophysics and General Pathology, Second University of Naples, Via L. De Crecchio 7, 80138, Naples, Italy.
authors.forename: Concetta Paola
authors.initials: CP
authors.lastname: Ilisso
authors.forename: Maria
authors.initials: M
authors.lastname: Castellano
authors.forename: Silvia
authors.initials: S
authors.lastname: Zappavigna
authors.forename: Angela
authors.initials: A
authors.lastname: Lombardi
authors.forename: Giovanni
authors.initials: G
authors.lastname: Vitale
authors.forename: Alessandra
authors.initials: A
authors.lastname: Dicitore
authors.forename: Giovanna
authors.initials: G
authors.lastname: Cacciapuoti
authors.forename: Michele
authors.initials: M
authors.lastname: Caraglia
authors.forename: Marina
authors.initials: M
authors.lastname: Porcelli
mesh_terms: D000903:Antibiotics, Antineoplastic / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D001943:Breast Neoplasms / Q000188:drug therapy*; D045744:Cell Line, Tumor; D004317:Doxorubicin / Q000494:pharmacology*; D004357:Drug Synergism; D006801:Humans; D012436:S-Adenosylmethionine / Q000494:pharmacology*; D014015:Tissue Banks
chemical_list: D000903:Antibiotics, Antineoplastic; D012436:S-Adenosylmethionine; D004317:Doxorubicin