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. 2018 Feb 19;8:3305. doi: 10.1038/s41598-018-21642-0

Figure 5.

Figure 5

SSE15206 causes apoptosis in drug-resistant cell lines. (A and B) SSE15206 induces PARP cleavage in control and multidrug-resistant cell lines. Both cell line pairs, KB-3–1/KB-V1 and A2780/A2780-Pac-Res were treated with 5× and 10 × GI50 values of SSE15206 or paclitaxel for 24 hours followed by analysis of cleaved-PARP through western blotting. Blots for GAPDH and MDR-1 show loading control and MDR-1 overexpression, respectively in KB-V1 and A2780-Pac-Res cell lines. (C) PARP cleavage and p53 induction by SSE15206 and paclitaxel in HCT116 DMSO and HCT116-Pac-Res cell lines. Cells were treated with 2.5× and 5 × GI50 values of SSE15206 or paclitaxel for 24 hours followed by analysis of PARP cleavage and p53 induction. Levels of GAPDH were used as a loading control. D and E. Effect of 40 μM Verapamil (positive control for inhibition of Pgp) and 10 μM SSE15206 on the efflux of Rhodamine 123 by KB-V1 (D) and A2780-Pac-Res (E) cells. (One-way ANOVA; n.s. = not significant, *p ≤ 0.05). (One-way ANOVA D: F (2, 3) = 19.81, p < 0.05; post-hoc: SSE15206 10 μM vs. DMSO p > 0.05, Verapamil 40 μM vs. DMSO *p < 0.05; One-way ANOVA E: F (2, 3) = 15.99, p < 0.05; post-hoc SSE15206 10 μM vs. DMSO p > 0.05, Verapamil 40 μM vs. DMSO *p < 0.05).