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. 2022 Apr 22;13(4):398. doi: 10.1038/s41419-022-04741-9

Fig. 1. Mitochondria are fragmented in CDDP resistant cells.

Fig. 1

A Images of mitochondrial network in sensitive (2008, U2OS) and resistant (C13, U2OS-PT) cells acquired by confocal microscopy Zeiss using TOM20 immunostaining, 488. Scale bar 20 µm. B Mitochondria segmentation was performed using the ImageJ Squassh plugin (Rizk et al., 2014); size and morphology features were measured by using Fiji. Data from 15 different cells per cell line. *p < 0.05, calculated by a two-tailed unpaired t-test comparing resistant vs sensitive cells. C Images of mitochondrial morphology in sensitive (2008, U2OS) and resistant (C13, U2OS-PT) cells acquired by Tecnai G2 (FEI) transmission electron microscope operating at 100 kV; images were collected by a F114 (TVIPS) CCD camera. The TEM images and experiment are performed by the University of Padova electron microscopy facility. Scale bar 1 µm and 500 nm. D The morphometric analysis was performed using ImageJ freehand tool (at least 5 cells per sample, at least 50 images/sample). Data are the mean ± SEM of three different experiments; **p < 0.01, ***p < 0.001, calculated by a two-tailed unpaired t-test comparing resistant vs sensitive cells. E, F Expression of OPA1, MFN1, MFN2, MFFs, p-DRP1 and total DRP1. G The optical density (O.D.) was normalized respectively to TOM20; for total DRP1 to β-ACTIN for 2008-C13 or calnexin for U2OS-U2OS-PT in cancer cells sensitive and resistant. The data are expressed as ratio of resistant cells to sensitive. Data are the mean ± SEM of 4–5 different experiments; *p < 0.05; **p < 0.01, ***p < 0.001, calculated by a two-tailed unpaired t-test comparing resistant vs sensitive cells. H mRNA expression of genes OPA1, MFN2, DRP1 and H-FIS1 normalized to β-actin for 2008-C13 or calnexin for U2OS-U2OS-PT. The data are expressed as a ratio of resistant cells to sensitive cells set to 1. Data are the mean ± SEM of 4–5 different experiments; *p < 0.05; **p < 0.01, calculated by a two-tailed unpaired t-test comparing resistant vs sensitive cells.