ATR-FTIR spectroscopy shows changes in ovarian cancer cells after incubation with novel organoamidoplatinum(ii) complexes

Attenuated Total Reflection Fourier Transform Infrared (ATR-FT-IR) spectroscopy has been applied to compare the effect of the new organoamidoplatinum(ii) complexes [Pt{NH(p-HC₆F₄)CH₂CH₂N(p-HC₆F₄)}(py)(O₂CR)] (R = C₆F₄ or 2,4,6-Me₃C₆H₂) with cisplatin on cells from one cisplatin-sensitive ovarian cancer cell line (A2780) and one cisplatin-resistant ovarian cancer cell line (A2780R). After incubation of the cells with cisplatin, 1 and 2 for 48 hours, distinct changes were found in the ATR-FT-IR spectra. Comparison of the second derivative spectra suggests that 1 and 2 induce similar chemical changes in both cell lines, A2780 and A2780R, while cisplatin had a slight effect on A2780 and A2780R cells. Furthermore, drugs 1 and 2 result in changes to the phosphodiester and polysaccharide bands in the spectra. This work shows how ATR-FT-IR can be applied to monitor the effects of organoamidoplatinum(ii) complexes on cisplatin-sensitive and cisplatin-resistant cell lines providing potential information on how drugs affect the cellular metabolism.