Synthesis and anticancer activity of lipophilic platinum(II) complexes of 3,5-diisopropylsalicylate

Eur J Med Chem. 2008 Jul;43(7):1438-43. doi: 10.1016/j.ejmech.2007.09.006. Epub 2007 Sep 19.

Abstract

Novel lipophilic platinum(II) complexes (LSPt-1-3), containing 3,5-diisopropylsalicylate (DIPS) as a leaving group and 2NH(3) or 1R,2R-diaminocyclohexane or (4R,5R)-4,5-bis(aminomethyl)-2-isopropyl-1,3-dioxolane as the carrier, have been synthesized, characterized and evaluated in vitro and in vivo. The octanol/water distribution coefficient of the complexes has also been measured. The results showed that the complexes achieved a typical square planar and the octanol/water distribution coefficient logP was 4.27, 4.37 and 4.31. The complexes were tested by SRB method to be more cytotoxic than Carboplatin, Oxaliplatin and Eptaplatin against 3AO, A549, NCI-H460 and SGC-7901 human cancer cell lines. Among complexes, LSPt-2 was much more effective than Carboplatin and Oxaliplatin in treating the NCI-H460 non-small-cell lung tumor-bearing mice. Its optimal activity was 38.8% (T/C) at a dose of 30 mg/kg following i.p. administration. LD(50) for the complex was found to be 230.9 mg/kg. LSPt-2 exhibited great anticancer activity, good lipophilic ability and low toxicity and therefore, it is a promising candidate for effective and stable pharmaceutical liposomal platinum anticancer drug.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Line, Tumor
  • Drug Screening Assays, Antitumor
  • Humans
  • Lethal Dose 50
  • Magnetic Resonance Spectroscopy
  • Mice
  • Platinum Compounds / chemical synthesis*
  • Platinum Compounds / chemistry
  • Platinum Compounds / pharmacology*
  • Salicylates / chemistry*
  • Spectrometry, Mass, Fast Atom Bombardment
  • Spectrophotometry, Ultraviolet

Substances

  • Platinum Compounds
  • Salicylates
  • 3,5-diisopropylsalicylic acid