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Confocal microscope

Manufactured by Zeiss
Sourced in Germany, United States, Japan, United Kingdom, China

The Zeiss Confocal Microscope is an optical imaging technique that captures high-resolution, three-dimensional images by scanning the sample with a focused laser beam. It allows for the efficient elimination of out-of-focus light, resulting in sharper, more detailed images compared to conventional optical microscopes.

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860 protocols using confocal microscope

1

Immunofluorescence and TUNEL Assay in ARPE-19 Cells

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Phosphate buffered saline (PBS)-washed, paraformaldehyde-fixated (4%, 20 min; Merck, Darmstadt, Germany) ARPE-19 cells were permeabilized (PBS/0.2% Tween20 (PBS-T), 45 min), and unspecific bindings were blocked (3% bovine serum albumin (BSA) (Carl Roth, Karlsruhe, Germany)/PBS-T, 1 h). Antigens were detected using a primary antibody (Supplementary Materials, Table S1, overnight, 3% BSA/PBS-T) and a fluorescence-conjugated antispecies antibody (Supplementary Materials, Table S1, 45 min, 3% BSA/PBS). The fluorochrome HOECHST 33342 (1:1000) was used to stain DNA. Cells were covered with fluorescence mounting medium (Dako, Agilent Technologies, Santa Clara, CA, USA). Images were taken with a confocal microscope (Zeiss, Jena, Germany).
The TUNEL assay was performed with a DeadEnd™ Fluorometric TUNEL System (Promega, Madison, WI, USA) on paraformaldehyde-fixated, washed, and permeabilized (0.2% Triton X-100 in PBS) cells. Images were taken with a confocal microscope (Zeiss, Jena, Germany).
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2

Chondrogenic Differentiation of hUC-MSCs by LDH

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hUC-MSCs were cultured with different LDH (MgAl–Cl or MgFe–NO3) for 14 days. Then, the cells in each group were fixed with 4% PFA (Sigma-Aldrich, St. Louis, MO, USA), permeabilized with 0.25% Triton X-100 (Amresco, Cleveland, OH, USA), blocked with 5% donkey serum (Jackson ImmunoResearch, West Grove, PA, USA), and primary SOX9 antibody (Abcam, Cambridge, MA, USA) was incubated at 4 °C overnight. The next day, the samples were conjugated with a fluorescent secondary antibody (Invitrogen, Carlsbad, CA, USA) at room temperature and nuclei were stained with 4ʹ,6-diamidino-2-phenylindole (DAPI; Abcam). The expression of key genes during chondrogenic differentiation was observed and photographed using a confocal microscope (Carl Zeiss). The excitation wavelength of DAPI was 405 nm and that of SOX9 was 488 nm.
For the pathway inhibition study, hUC-MSCs were cultured with MgFe–NO3 LDH, Ac-PHSCN-NH2 (ATN; Selleck, TX, USA), and LDH + ATN for 7 days. Immunofluorescence staining was performed after 7 days of culture. The staining steps were the same as above, and the primary antibody to integrin, was purchased from Abcam. Fluorescence was observed using a confocal microscope (Carl Zeiss). The excitation wavelengths were 405 nm for DAPI, 488 nm for SOX9, 647 nm for integrin, and 594 nm for F-actin.
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3

Visualizing Porous Hydrogel Structures

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In order to visualize porous hydrogel structures, untreated (not freeze-dried after polymerization) and freeze-dried hydrogels were incubated with 200 µM YFP-LecB, washed twice with PBS, cut into small fragments and analysed at the Zeiss Confocal Microscope (Carl Zeiss Ag, Oberkochen, Germany) at 488 nm (Fig. 3). To investigate YFP-LecB specificity for the hydrogels, the YFP-LecB gels were diffused by 200 µM GFP for 1 min and analysed at the Zeiss Confocal Microscope (Carl Zeiss AG, Oberkochen, Germany) at 488 and 514 nm.
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4

Live/Dead Staining of S. aureus Biofilm

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The live dead staining of bacterial cells was done using standard protocol,29 (link) with variations. Briefly, the glass cover slip with pre-formed S. aureus biofilm was washed extensively with double distilled water, followed by washing with PBS, pH 7.0. The staining for viable cells on the cover slips was performed by the addition and 5 μM of Syto9 (ThermoFischer Scientific, USA), diluted in DMSO. The staining was done for 10 min in dark conditions. After incubation, the cover slips were further washed extensively with 1× PBS and final rinsing in double distilled water. In order to stain for nonviable S. aureus cells, propidium iodide (ThermoFischer Scientific, USA) was diluted in 2× SSC buffer (0.3 M NaCl, 0.03 M sodium citrate, pH 7.0) to a final concentration of 500 nm. The diluted propidium iodide was added to the washed and rinsed Syto9 stained cover slip. The staining was done for 10 min, followed by washing with 1× PBS and final rinsing with double distilled water. The imaging was done by Confocal microscope (Zeiss, Germany) at an excitation/emission of 483/503 nm for Syto9 and 535/617 nm for propidium iodide. The images were acquired on a Rolera Em-C2 camera with a 63× oil immersion objective (Zeiss, Germany). The acquired image was processed by Zen software (Zeiss, Germany).
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5

Immunohistochemical and Immunofluorescent Analysis of Follistatin in Liver Tissue

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Paraffin-embedded liver sections were deparaffinized, hydrated, thermally repaired with 0.01 M sodium citrate buffer, and then incubated in 3% hydrogen peroxide for 10 min to eliminate endogenous peroxidase activity. Next, the sections were incubated with 5% BSA for 1 h at 37°C and primary antibody against FST (#60060-1-Ig, Proteintech, China) at 4°C overnight and then washed with phosphate-buffered saline three times.
For IHC staining, the sections were incubated with secondary antibody and StreptAvidin—Biotin Complex (SABC) for 30 min each (#SA1050, BOSTER, China), and then 3.3’-diaminobenzidine (DAB; #AR1022, BOSTER, China) was added for 3 min. Finally, hematoxylin staining was performed for cell counting. The IHC results were based on 10 random fields in each section using an optical microscope (Zeiss, Germany).
For IF staining, fluorescent secondary antibody (Alexa Fluor® 488-labeled goat anti-mouse IgG(H+L); #ab150113, Abcam) was added for 1 h at room temperature, and then the cell nuclei were counterstained with 4’,6-diamidino-2-phenylindole (DAPI) for 5 min. The IF images were obtained using a confocal microscope (Zeiss, Germany).
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6

Immunostaining of Drosophila Neuronal Tissues

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Antibodies used in this work include Guinea pig anti Oc (1:750, gift from Tiffany Cook) (Xie et al., 2007 (link)); Rabbit anti Sox102F and Rabbit anti Slp1 (1:500 for both, Gifts from Claude Desplan); Rabbit anti-D (1:200) (from John R. Nambu), mouse anti-Ey (1:10, DSHB), sheep anti-GFP (1:500, AbD Serotec), Goat anti anti-beta-gal (Abcam 1:1000), rabbit anti-RFP (Abcam 1:1000), Rabbit anti HA (Cell Signaling Technology, 1:1000). Secondary antibodies are from Jackson or Invitrogen. Immunostaining was done as described (Li et al., 2013 (link)) with a few modifications: 3rd instar Larval brains or adult brains were dissected in 1XPBS, and fixed in 4% Formaldehyde for 30 minutes on ice (larval) or 45min at RT (adult). Brains were incubated in primary antibody solution overnight at 4°C, washed three times and incubated in secondary antibody solution overnight at 4°C, washed three times and mounted in Slowfade. Images are acquired using a Zeiss Confocal Microscope. Figures are assembled using Photoshop and Illustrator.
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7

Mitochondrial Stress Protein Localization in Chondrocytes

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For determination of localization of mitochondrial stress proteins in chondrocytes, a modified Mito-Tracker Red CMXRos kit (Beyotime, China) was used according to manufacturer’s instructions to label mitochondria, at an excitation of 579 nm and an emission of 599 nm. Cultured cells were washed thrice with PBS and fixed in 4% paraformaldehyde for 20 min. Cells were first treated with CMXRos for 20 min. The cells were permeabilized for 10 min with 0.1% Triton X-100 and blocked with 5% BSA for 30 min at room temperature. Next, the cells were stained with anti-HSP10, anti-ClpP, or anti-LONP1 antibodies (1:500; Bioss, Beijing, China) with 1% BSA overnight at 4 °C. The next day, the cells were washed three times with PBS for 5 min, incubated with the corresponding fluorescent-labeled secondary antibody (FITC, 1:200 Boster, Wuhan) for 1 h in the dark, washed three times with PBS for 5 min, and counterstained with 4′,6-diamidino-2-phenylindole (DAPI) for 5 min. Images were captured using a confocal microscope (Zeiss, Germany). FITC was analyzed with excitation at 495 nm and emission at 591 nm. DAPI was analyzed with excitation at 353 nm and emission at 465 nm.
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8

Spatio-temporal analysis of cell fate

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Fertilized chicken eggs were incubated at 37 °C until Hamburger and Hamilton stage 18/19. A small window was made in the eggshell, followed by a hole in the upper membrane through which 200 µL of 200 mM FUrd or 50 mM EdU was injected. Eggs were resealed with tape and incubated at 37 °C for 1 h. Embryos were fixed in 4% paraformaldehyde (PFA) for 1 h at room temperature, washed in PBS then incubated overnight in 30% sucrose and subsequently frozen down in Tissue-Tek O.C.T. (Sakura) for sectioning. Sections were washed in PBS and stained overnight at 4 °C for FUrd and Snail1/2, see (Supplementary Table 1) for antibody details. Secondary antibodies listed previously were applied at 1:1000 dilution for 45 min, followed by DAPI stain. EdU detection was achieved using Click-IT azide-Alexa Fluor 488 (Life Technologies) according to the manufacturer’s protocol. All images were captured with a Zeiss Confocal microscope. Chick experiments were repeated at least 3 times with 2 or more embryos.
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9

RNA FISH Assay for CircRNA Detection

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Briefly, T24 and SW780 cells were seeded on cell slides, fixed with 4% paraformaldehyde, treated with 0.5% Triton and prehybridized. Overnight hybridization was then performed with probes (10 mM). The assays were conducted using RNA FISH kit (Guangzhou RiboBio Co., Ltd., Guangzhou, Guangdong, China) according to the manufacturer’s instructions. The Cy3-labeled circ_0000629 probe was synthesized and provided by Sangon Biotech (Shanghai, China). Images were taken with a confocal microscope (Carl Zeiss, Oberkochen, Germany).
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10

Immunocytochemistry for DUSP6 Localization

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Cells were seeded into 6-well plates pre-coated with poly-L-lysine (Sigma-Aldrich Chemical, St. Louis, MO, USA) and stabilized for 24 h. After fixation with 4% of formaldehyde (Sigma-Aldrich Chemical, St. Louis, MO, USA) for 10 min, cells were treated with 0.25% TritonX-100 (Sigma-Aldrich Chemical, St. Louis, MO, USA) to permeabilize all lipid bilayers for 10 min. After being washed with PBS buffer two times, cells were blocked with 1% of BSA solution at room temperature for 30 min. Primary antibody against DUSP6 was added to cells at 4 °C overnight. Then, cells were incubated with mouse anti-rabbit IgG-CFL 488 for 1 h. Nuclei of cells were stained using DAPI. Fluorescent images were measured by confocal microscope (Carl Zeiss, Oberkochen, Germany) and quantified by ImageJ version 1.53n (National Institutes of Health, Bethesda, MD, USA).
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