Synthesis and characterization of trans-Pt(II)(salicylaldimine) (pyridine/pyridine-4-carbinol)Cl complexes: In vivo inhibition of E-coli growth and in vitro anticancer activities

Three trans-Pt(II) complexes, i.e. Pt(II)(salicylaldimine)(Py)Cl (C1), Pt(II)(salicyl-aldimine)(Py-4-carbinol) Cl (C2), and bi-metallic Pt(II)(2)(salicylaldimine)(Py)(2)Cl-2 (C3), have been synthesized and their structures have been characterized by NMR, HRMS and X-ray crystal analysis. Bioactivities, especially in vivo inhibition of Escherichia coil growth and in vitro cytotoxicity in MCF-7 and HepG2 human cancer cell lines have been investigated. The results disclosed that all three complexes have dominant retardation effects on E. coil growth and considerable cytotoxicity to both cancer cell lines, which were comparable to those of cisplatin. For E. coli growth inhibition, that of mono-metallic Cl was most prominent than those of polar side chain substituted C2 and bi-metallic C3. Cell cycle studies revealed that their abilities of blocking cell cycle progression in luminal like breast cancer cells caused inhibition of DNA synthesis. Keeping in view their convenient synthesis, stabilities and good cytotoxicities as well as their stronger retardation effects to cell growth in bacteria, this class of Pt(II) complexes could find a possible consideration in anticancer drug discovery. (C) 2015 Elsevier Ltd. All rights reserved.