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. 2021 Apr 1;11:7347. doi: 10.1038/s41598-021-86762-6

Figure 4.

Figure 4

(a)(c) In vitro anti-cancer efficiency of PTXNR-TTZ ADNs: The cytotoxic effects of PTXNR-TTZ (closed circle), PTXNR (triangle), PTX solution (diamond), and TTZ (square) on the growth of (a) BT-474, (b) SK-BR-3, and (c) MDA-MB-231 cells. Each experiment was replicated at least n = 6 times, and the average data is presented with mean ± standard deviation. The p values are given in SI Table 3. (d)(f) The nuclear morphology of apoptotic cells stained with Hoechst 33342: Cells transfected with PTXNR-TTZ were stained with Hoechst 33342 72 h post-transfection and observed under a fluorescence microscope. The combined treatment with PTXNR-TTZ displayed the increased amount of nuclear fragmentation in (d) BT-474, (e) SK-BR-3, and (f) MDA-MB-231 cells. Untreated control cells remained uniformly stained with round and undamaged nuclei. The figures represent one of three independent experiments. (g)(i) Combination index (C.I.) analysis of PTXNR-TTZ ADNs: The C.I. plot as a function of each fraction of cells affected by PTXNR-TTZ particles in (g) BT-474, (h) SK-BR-3, and (i) MDA-MB-231 cells. A C.I. value = 1; additive effect, < 1; synergistic effect, > 1; antagonistic effect.