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Cytotoxicity and DNA damage induced by a new platinum(II) complex with pyridine and dithiocarbamate |
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| Authors: | Marzano Cristina Fregona Dolores Baccichetti Francarosa Trevisan Andrea Giovagnini Lorena Bordin Franco |
| Affiliation: | a Department of Pharmaceutical Chemistry, University of Padova, Centro di Studio sulla Chimica del Farmaco e dei Prodotti Biologicamente Attivi del C.N.R. (associated with National Institute for the Chemistry of Biological Systems) C.N.R., Via Marzolo 5, 35131, Padova, Italy b Department of Inorganic, Metallorganic and Analytical Chemistry, University of Padova, Padova, Italy c Department of Environmental Medicine and Public Health, University of Padova, Padova, Italy |
| Abstract: | A new platinum(II) complex containing a pyridine nucleus and a dithiocarbamate moiety as ligands ([Pt(ESDT)(Py)Cl]) was evaluated for in vitro cytotoxicity in the cisplatin-sensitive human ovarian 2008 and in the isogenic-resistant C13* cell lines. In both cell types, a tumor cell growth inhibition greater than cisplatin and a complete lack of cross-resistance in C13* cells were found. Despite its molecular size, [Pt(ESDT)(Py)Cl] accumulation was much higher than cisplatin both in parent and resistant cells. Studying the mechanism of action in cell-free media, we established that [Pt(ESDT)(Py)Cl] more efficiently interacts with DNA in vitro compared to cisplatin maintaining a binding preference for GG rich sequences of DNA. On the contrary, DNA platination in vivo by [Pt(ESDT)(Py)Cl] was found lower than cisplatin. An analysis of the type of DNA lesions induced by [Pt(ESDT)(Py)Cl] suggests that the cytotoxic efficacy and the ability to overcome cisplatin resistance seem to be related to a different mechanism of interaction with DNA and/or with other key cellular components. |
| Keywords: | Platinum(II) complex DNA binding Cytotoxicity |
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