(6-Aminomethylnicotinate)dichloridoplatinum(II) complexes
4 esterified with terpene alcohols were testedon a panel of five human tumor cell lines. While they were accumulated in all cell lines more readily thancisplatin (CDDP), their cytotoxicities were tumor-specific and structure-dependent. Cell lines known tofeature elevated levels of antiapoptotic, ion-channel-affecting proteins or otherwise impaired caspase-9activation responded better to
4 than to CDDP, e.g., the HL-60 leukemia to the fenchyl and bornyl derivatives
4a,
b at an IC
90 ![](/images/entities/le.gif)
10
![](/images/entities/mgr.gif)
M. The (-)-menthyl complex
4g was far better accumulated and more efficacious inCDDP-resistant 1411HP male germ cell tumor cells than in the congenerous CDDP-sensitive H12.1 cellline.
4g also broke the CDDP resistance of 518A2 melanoma cells. Cell decay in each case was apoptoticas to TUNEL and Annexin V fluorescence assays. Some complexes
4 seem to positively modulate thepermeability of the cell membrane and of blocked mitochondrial anion channels.