The reversal effect of magnetic Fe(3)O(4) nanoparticles loaded with cisplatin on SKOV3/DDP ovarian carcinoma cells

To explore whether the magnetic nanoparticles of Fe(3)O(4) (MNPs-Fe(3)O(4)) loaded with cisplatin can reverse the diaminedichloro platinum (DDP) resistance to multidrug resistance of ovarian carcinoma cells and to investigate its mechanisms. The SKOV3/DDP cells were divided into DDP treatment (DDP group), MNPs-Fe(3)O(4) treatment (MNPs-Fe(3)O(4) group), DDP + MNPs-Fe(3)O(4) treatment (DDP + MNPs-Fe(3)O(4) group), and control group. After incubation with those conjugates for 48 h, the cytotoxic effects were measured by MTT assay. Apoptosis and the intracellular DDP concentration were investigated by flow cytometry and inductively coupled plasma atomic emission spectroscopy, respectively. The expression of apoptosis associated gene Bcl-2 mRNA was detected by reverse transcription polymerase chain reaction and the expressions of MDR1, lung resistance-related protein (LRP), and P-glycoprotein (P-gp) genes were studied by Western blot. Our results indicated that the 50% inhibition concentration (IC(50)) of the MNPs-Fe(3)O(4) loaded with DDP was 17.4 μmol/l, while the IC(50) was 39.31 μmol/l in DDP groups (p < 0.05); Apoptosis rates of SKOV3/DDP cells increased more than those of DDP groups. Accumulation of intracellular cisplatin in DDP + MNPs-Fe(3)O(4) groups was higher than those in DDP groups (p < 0.05). Moreover, the expression of Bcl-2 mRNA and the protein expressions of MDR1, LRP, and P-gp were decreased when compared with those of DDP groups, respectively. Our results suggest that MNPs-Fe(3)O(4) can reverse the DDP resistance to the ovarian carcinoma cell. The effects may be associated with over-expression of MDR1, LRP, P-gp, and Bcl-2, which can increase the intracellular platinum accumulation and induce the cell apoptosis.