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16 protocols using mitotracker

1

Immunofluorescence Staining of Cultured Cells

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Immunofluorescence was performed in cultured BAs and the Cos-7 cell line. Briefly, samples were fixed in 4% PFA for 10 min, quenched with 100 nM glycine for 10 min, and permeabilized and blocked in blocking buffer (PBS containing 5% goat serum, 2% bovine serum albumin (BSA), 0.2% Triton X-100, and 0.1% sodium azide) for 1 h at RT. Samples were subsequently incubated with primary antibodies diluted in blocking buffer overnight at 4 °C. After washing with PBS, samples were incubated with secondary antibodies and DAPI (Invitrogen, cat#D1306) for 1 h at RT. Mature BAs were stained with Bodipy 493/503 (Invitrogen, cat#D3922) and DAPI. For MitoTracker (Cell Signaling Technology, cat#9082) staining, live cells were incubated with FBS-free DMEM containing 0.2% MitoTracker for 50 min, then fixed with iced-cold methanol for 20 min. Antibodies used for immunofluorescence staining are listed in Supplementary Table 1. Primary antibodies and dilutions were used as follows: C18orf19 (FAM210A, Invitrogen, PA5-53146; 1:300), c-Myc (Santa Cruz Biotechnology, sc-40; 1:300), Tom20 (Santa Cruz Biotechnology, sc-11415; 1:300). Fluorescent images were captured using a Leica DM6000B microscope.
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2

Monitoring UPR Activation in C. elegans

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To determine UPRmt or UPRER activation, strains carrying hsp‐6p::GFP or hsp‐4p::GFP were utilized. Synchronized worms were visualized at of day 1 of adulthood. For the fluorescence imaging, worms were anesthetized with M9 buffer containing 20 mM sodium azide, and an Olympus BX63 microscope was used. Worm GFP intensity was then quantified with ImageJ software. In SAM, methionine, and homocysteine supplementation experiments, P0 worms were grown on empty vector or RNAi bacteria from hatching. F1 eggs were then transferred on plates seeded with UV‐killed bacteria and supplemented with the vehicle, 2 mM SAM (Sigma‐Aldrich, A2408), 2 mM L‐methionine (Sigma‐Aldrich, M5308), and 2 mM homocysteine (Sigma‐Aldrich, 69453). Day 1 adult F1 worms were then scored for GFP intensity.
For monitoring the subcellular localization of SLC‐25A26::GFP or TRMT‐10C.2::GFP, worms were mounted on 2% agarose pads with 50 mM tetramisole (Sigma, T1512). Images were acquired using Zeiss Elyra 7 microscope and Zeiss LSM 900 laser scanning confocal microscope, respectively.
For Mitotracker Red staining, L4 worms carrying TRMT‐10C.2::GFP were cultured on UV‐killed bacteria with 2 μM Mitotracker (Cell Signaling Technology, 8778) for 24 h. Worms were subsequently transferred to stain‐free plates for 30 min to eliminate the excess stain in the gut lumen before proceeding with image analysis.
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3

Lysosome and Mitochondria Imaging in Cells

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Cells labeled with LysoTracker (Invitrogen, L7528) and MitoTracker (Cell Signaling Technology, 8778) were transferred to a microscope stage and maintained at 37°C. Pseudo-TIRF microscopy (oblique illumination) experiments were performed using a X100 1.45 numerical aperture TIRF objective (Nikon) on a Nikon TE2000U microscope custom-modified with a TIRF illumination module as described [11 (link)]. Images were acquired on a 14-bit cooled charge-coupled device camera (Hamamatsu) controlled through NIS-Elements software. For live cell imaging, the images were recorded using 200–500-ms exposures depending on the fluorescence intensity of the sample. The track speed mean was then analyzed using Imaris as described before [11 (link),39 (link)]. Wild-type and ctns-/- cells were analyzed comparatively by maintaining exposure time and gain throughout the experiment. Length of mitochondria were analyzed using the “Measure” tool in ImageJ software.
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4

Immunofluorescence Staining of Cell Lines

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HAP1 cells were seeded on the glass chamber slides (Lab Tek) that were pre-coated with 5 g/mL human plasma fibronectin (EMD Millipore) for 5 hrs before fixation. HeLa cells transfected with expression constructs were cultured for 24 hrs before fixation. Cells were fixed in 4% paraformaldehyde for 15 min and then permeabilized with 0.3% Triton X-100. After blocking in 5% goat serum for 1 hr, slides were incubated with primary antibody diluted in 5% goat serum for overnight at 4°C. After three washes in PBS, slides were incubated with secondary antibody for 1 hr, washed for three times in PBS, incubated with DAPI (1:10000 dilution) for 5 min, then washed and mounted. HeLa cells were incubated with 100 nM of Mitotracker (Cell signaling) for 1 hr before fixation to label mitochondria.
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5

Imaging Mitochondrial Dynamics in MEFs

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Mfn1−/−, Mfn2−/−, Mfn1/2−/−, and Opa1−/− MEFs11, 19 and Hela cells were obtained from ATCC. In live-cell experiments, cells were plated on collagen coated 14 mm glass bottom dishes (MatTek, USA). After incubation with 100 nM MitoTracker (Cell Signal), cells were imaged in live cell imaging solution (ThermoFisher) on the 37 °C preheated stage of a Nikon A1RS confocal microscope. Cells were imaged with an oil immersion PlanApo 60X objective and appropriate laser lines for each fluorophore were used.
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6

Visualizing Mitochondria and Lipids in 3T3-L1 Cells

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3T3-L1 cells were grown as described in ‘3T3-L1 culture, differentiation and treatment’. At day 7 post induction cells were incubated in a medium containing 50 μM of Mitotracker (Cell Signaling, 9082P) for 30 min. Cells were then washed with PBS and fixed with 4% formaldehyde during 10 min and rinsed 3 times with PBS. Lipid droplets were stained with a Bodipy 493/503 (D3922, Thermo Fisher Scientific) in a staining solution (1 μg/ml Bodipy 493/503, 150 mM NaCl) for 10 min at room temperature. Nuclei were stained with DAPI (0.5 μg/ml).
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7

Visualizing Nucleic Acids in C. elegans and Mammalian Cells

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For C. elegans, animals, pre-stained with EtBr (8 µg/ml or 20.3 µM) and SYBR gold (1/5000) followed by hypoxia, were gonad dissected, fixed (4% formaldehyde, Electron Microscopy Sciences), permeabilized (PBS + 0.1% triton-X 100, Sigma), and treated with DNase I (50 U/ml, New England BioLabs) or RNase A (500 mg/ml, New England BioLabs). The gonads were then mounted and imaged.
For mammalian cells, the H9c2, embryonal rat heart-derived cells were obtained from the ATCC (atcc.org) and were cultured in Iscove’s Modified Dulbecco’s Medium (IMDM, Gibco) supplemented with 10% fetal calf serum (Gibco). The cells grown on glass cover slips, with less than 80% confluence, were prestained with EtBr (1.58 µg/ml or 4 µM) and SYBR gold (1/10,000X) or MitoTracker (0.25 µM) (Cell Signaling) followed by sodium azide (NaN3, 100 mM, 3 h, Sigma) treatment. For MitoTracker/EtBr staining, cells were immediately mounted and imaged by confocal microscopy. For DNase and RNAse experiments, cells were fixed (4% formaldehyde, Electron Microscopy Sciences), permeabilized (PBS + 0.1% triton-X 100, Sigma), and treated with DNase I (50 U/ml, New England BioLabs) or RNase A (500 mg/ml, New England BioLabs). The cells were then mounted and imaged.
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8

Quantifying Cell Fusion Dynamics

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After cell differentiation, cells were stained with 50 nM MitoTracker (Cell Signaling Technology) for 45 min at 37 °C. Cells were then fixed with cold methanol for 10 min, followed by washing 3× with PBS for 5 min. Cells were permeabilized with 0.05% Triton X-100 solution, blocked with 1% bovine serum albumin solution for 30 min, and incubated overnight at 4 °C with the primary antibody. Cells were then washed 3× with PBS for 5 min and incubated with a goat anti-mouse immunoglobulin G, Flamma® 488-labeled secondary antibody (Invitrogen, Waltham, MA, USA) for 1 h in the dark. Nuclei were stained with 4′,6-diamidino-2-phenylindole and observed using an Eclipse Ti-U fluorescent microscope (Nikon, Tokyo, Japan). The fusion index was determined by calculating the ratio of nuclei present in MHC-positive cells with 2 or more nuclei among the total nuclei in the randomly selected region.
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9

Quantifying Mitochondrial Fragmentation

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The morphology of mitochondria was examined by MitoTracker staining (Cell Signaling, 9074) as previously described [22 (link)]. The percentage of mitochondrial fragmentation was calculated by comparing the number of cells with fragmented mitochondria to the total number of cells.
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10

Multiparameter Flow Cytometry Analysis

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For FACS analysis, 1 × 106 cells were used per sample. Cells were blocked for 15 min in PBS, 2% BSA on ice in a total volume of 100 μL. The staining step was carried out on ice for one hour with the appropriate antibody or incubated in the corresponding isotype control diluted as suggested by the manufacturer’s protocol. The surface expression of RANK (R12-31) IgG2a (RTK2758), CD11b (M1/70), CD80 (16-10A1), CD86 (GL-1), F4/80 (BM8) was quantified by flow cytometry by using FACS Canto cytometer (BD Biosciences, Heidelberg, Germany) and BD FACS Diva Software. For the live/dead staining, cells were washed once with DPBS and were stained with SYTOX dye. The cells could be analysed within the FITC channel directly, without further incubation or washing. For measuring mitochondrial activity, the cells were stained with 100 nM MitoTracker (Cell Signaling Technology, Leiden, The Netherlands). After 30 min incubation, the cells were washed with PBS and analysed within the APC-Cy7 channel.
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