Synthesis and antitumor activity of iodo-bridged binuclear platinum complex

Iodo-bridged binuclear platinum(II) complexPt( -NH₂)I₂]₂ (BPA) has been synthesized and characterized by elemental analysis, conductivity, differential thermal analysis, IR, UV and ¹HNMR spectra techniques. The cytotoxicity of the complex was tested by MTT and SRB assays. The results show that complex BPA demonstrates better cytotoxicity than that of the clinically established cisplatin against EJ, HCT-8, BGC-823, HL-60 and MCF-7 cell lines. The complex BPA at concentrations of 1.00 and 2.00 μmol/L induces G₁ cell cycle arrest in HL-60 cells. The level of total platinum bound to DNA in HL-60 cells is significantly higher than that of cisplatin under the same experimental conditions. Acute toxicity experimental results indiacte that LD₅₀ of BPA is 815.3 mg/kg by intraperitoneal administration. BPA at dose of 12 mg/kg significantly inhibits the growth of nude mice implanted by human A2780 and HCT-116 carcinomas, and inhibition rate is similar to that of cisplatin at dose of 4 mg/kg by intraperitoneal administration. BPA at dose of 20 mg/kg inhibits the growth of nude mice implanted by human A549 carcinomas, but there was no significant statistical difference.