DOI: 10.5281/zenodo.14932873
title: BIO407 Group6 Image processing of live cells, treated with DFX

description: ## Study:

This data is part of the practical course BIO407 2025 at the University of Zurich, titled 'Advanced Microscopy: From preparation to data and visualization'.

The effects of Deferasirox (DFX) on mitochondria morphology were examined using different microscopy techniques.

The data is originally from the paper:

Gottwald EM, Schuh CD, Dr點ker P, Haenni D, Pearson A, Ghazi S, Bugarski M, Polesel M, Duss M, Landau EM, Kaech A, Ziegler U, Lundby AKM, Lundby C, Dittrich PS, Hall AM. The iron chelator Deferasirox causes severe mitochondrial swelling without depolarization due to a specific effect on inner membrane permeability. Sci Rep. 2020 Jan 31;10(1):1577. doi: 10.1038/s41598-020-58386-9   . PMID: 32005861   ; PMCID: PMC6994599.   

 

## Study Component:

Job: Image Processing

Task: 4) Timelapse of mitochondria in deferasirox (DFX) treated cells

Timelapse data was analyzed: Mitochondria were segmented, their morphology and signal intensity were measured over time, and plotted.

 

## Biosample:

Opossum kidney (OK) cells (kind gift from the group of Prof O. Devuyst (Physiology, University of Zurich))

 

## Specimen:

DFX treatment: 200uM

Dyes:

-Mitochondria-GFP BacMam 2.0

-TMRM (mitochondrial membrane potential dependent dye)

 

## Image Acquisition:

Images were acquired using a Leica SP8 inverse STED 3x.

Acquired channels:

Channel 1: Mitochondria-GFP, 488nm excitation, 493nm-548nm emission

Channel 2: TMRM, 553nm excitation, 564nm-650nm emission

Objective: HC PL APO CS2 100x/1.40 OIL

 

## Image Data:

 

Raw timelapse data:

151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression.lif

Segmentation masks of mitochondria of channel with "Calculate Threshold for each image":

C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression_channel1_gaussian_otsu_open_watershed.tif

Mean GFP signal and circularity of segmented mitochondria at each timepoint channel 1:

Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1_channel1.csv

Mean GFP signal circularity of segmented mitochondria at each timepoint channel 2:

Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1_channel2.csv

 

Plot of mean GFP signal in mitochondria over time of channel 1:

Plot of Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1pixel_channel1.png

Plot of mean GFP signal in mitochondria over time of channel 2:

Plot of Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1pixel_channel2.png

Plot of mean circularity in mitochondria over time of channel 1:

Plot of Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_circularity_channel1.png

 

## Image Correlation

 

C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression_channel1_gaussian_otsu_open_watershed.tif contains the segmentation masks for the timelapse in 151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression.lif

Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1_channel1.csv contains the measurements for the timelapse in C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression_channel1_gaussian_otsu_open_watershed.tif redirected to channel 1

Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1_channel2.csv contains the measurements for the timelapse in C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression_channel1_gaussian_otsu_open_watershed.tif redirected to channel 2

Plot of Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1pixel_channel1.png contains the mean intensity plot of Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1_channel1.csv

Plot of Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1pixel_channel2.png contains the mean intensity plot of Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1_channel2.csv

Plot of Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_circularity_channel1.png contains the mean circularity plot of Summary of C1-151106_slide1_bacmam20_PPC_7473_Esther_DH_Progression-1_gaussian_otsu_open_watershed_MIN1_channel1.csv

 

## Image Analysis

 

We used Fiji to extract channel 1 of our raw timelapse image. We then applied Gaussian Blur, Otsu Thresholding ("Treshold for each image" + "Auto"), Binary-->Open and Watershed to get a binary mask of our raw timelapsed image.

Circularity and mean intensity were then measured by using the mask of channel 1 and redirected to the raw timelapse file for channel 1 and channel 2.