Abstract
Pt-based drugs such as cisplatin are frontline drugs used for the treatment of different solid malignancies. However, they represent major problems, such as severe side effects and drug resistance. To find out the structure-activity relationship; in this study, Pt(II) and Pt(IV) complexes with similar ligands, namely tetrachloro(2,2'-dipyridylamine)platinum(IV) (1) and dichloro(2,2'-dipyridylamine)platinum(II) (2) were synthesized, tested for their in vitro activity over different tumor cell lines and compared with cisplatin. Despite nontoxicity against nonmalignant cells, both titled compounds depict considerable killing activity over HT-29 cells. So, this cell line is served for further investigation. Cell cycle test revealed that the mechanism of cell cycle arrest induced by complexes 1 and 2 over HT-29 cells was relatively similar and obviously different from cisplatin. Moreover, apoptosis analysis showed that late apoptosis/necrosis is the primary disease for the death of cell by three complexes. Comet assay and colony-forming test were also performed on HT-29 cells whose results were thoroughly discussed.
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