To characterize the cellular action mechanism of Debio 0507, we compared the major DNA adducts formed by Debio 0507- and oxaliplatin-treated HCT116 human colon carcinoma cells by a combination of inductively coupled plasma mass spectrometry (ICP-MS) and ultraperformance liquid chromatography mass spectrometry (UPLC-MS/MS).
HCT116 cells were treated with IC50 doses of Debio 0507 or oxaliplatin for 3 days. Total cellular Pt–DNA adducts were determined by ICP-MS. The DNA was digested, and the major Pt–DNA adducts formed by both drugs were characterized by UPLC/MS/MS essentially as described previously for cisplatin (Baskerville-Abraham et al. in Chem Res Toxicol 22:905–912, 2009).
The Pt level/deoxynucleotide was 7.4/104 for DNA from Debio 0507-treated cells and 5.5/104 for oxaliplatin-treated cells following a 3-day treatment at the IC50 for each drug. UPLC-MS/MS in the positive ion mode confirmed the major Pt–DNA adducts formed by both drugs were dach-Pt-d(GpG) (904.2 m/z → 610 m/z and 904.2 m/z → 459 m/z) and dach-Pt-d(ApG) (888.2 m/z → 594 m/z and 888.2 m/z → 459 m/z).
These data show that the major DNA adducts formed by Debio 0507 are the dach-Pt-d(GpG) and dach-Pt-d(ApG) adducts and at equitoxic doses Debio 0507 and oxaliplatin form similar levels of dach-Pt-d(GpG) and dach-Pt-d(ApG) adducts. This suggests that the action mechanisms of Debio 0507 and oxaliplatin are similar at a cellular level.
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This work was supported by Research Contract Debio 0507-069 from Debiopharm SA (Lausanne, Switzerland) and P30-ES10126 from National Institute of Environmental Health Sciences.
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King, C.L., Ramachandran, S., Chaney, S.G. et al. Debio 0507 primarily forms diaminocyclohexane-Pt-d(GpG) and -d(ApG) DNA adducts in HCT116 cells. Cancer Chemother Pharmacol 69, 665–677 (2012). https://doi.org/10.1007/s00280-011-1744-3
- Debio 0507
- DNA adducts