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10 protocols using apotome attachment

1

Epifluorescent Microscopy with ApoTome

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Representative images were taken using an epifluorescent Axio Imager Z1 microscope with ApoTome attachment (Carl Zeiss, Oberkochen, Germany).
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2

Immunofluorescence Microscopy of Transfected Cells

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Cells were plated in 6-well plates and grown for 24 h. They were then transfected and 6 h after transfection they were transferred (diluted 1:10) to coverslips in a 24-well plate coated with poly-D-lysine (PDL) and collagen. Cells then grew for 24–72 h before fixation with 4% PFA/PBS for 20 min at RT depending on the experiment. Permeabilization of the cell membrane was done with 1% Triton-X-100/PBS for 5 min at RT. Blocking was done with 10% Normal Goat Serum in PBS, for 1 h at RT. The primary antibody incubations were done at the already mentioned concentrations, in 1%BSA/PBS for 2 h at RT. The secondary antibody incubation was done in 1% BSA/PBS for 1 h. Mounting was done using 40 µl of Dako mounting media per slide, following a 4° incubation overnight. Immunofluorescence images were acquired using a Zeiss fluorescence microscope with Apotome attachment (Axio imager z1 stand).
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3

Quantitative Fluorescence Microscopy Analysis

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Images of immunofluorescence were captured using an Axio-imager Z2 microscope fitted with an apotome attachment for structured illumination (Carl Zeiss MicroImaging) and a Nikon Eclipse Ni2. 20X (0.8 NA), 40X (0.95 NA), and 63X (1.4 NA) objectives were used. Images were taken using Zen 3.2 (Zeiss) or NIS-Elements (Nikon). For measurements of AIS streptavidin fluorescence intensity, 20 neurons per timepoint per replicate were imaged and line scans were drawn using Zen 3.2 software. AIS were identified by immunostaining using known AIS proteins (AnkG, β4 spectrin, Nfasc, or NrCAM). For the analysis of cerebellar pinceau, a region of interest including the Purkinje neuron AIS (labeled by Nfasc) was manually drawn. The fluorescence intensity for Kv1.2 was measured for each region of interest and normalized to the area. All measurements were taken with the same exposure times and immunolabeling was also performed at the same time. Images were exported to Fiji, Adobe Photoshop, and Adobe illustrator for figure presentation. Some figures were generated using Biorender.
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4

Microscopy Techniques for Germ Cell Analysis

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Experimental procedures for electron and fluorescence microscopy were performed as described earlier (Pertceva et al., 2010 (link)). The primary antibodies were: monoclonal rabbit anti-VASA antibodies from Santa Cruz Biotechnology (1:300), rabbit anti-Dcp-1 (Asp216) from Cell Signaling Technology. The secondary antibodies were goat anti-rabbit conjugated to AlexaFluor-488 (1:500; Invitrogen #A-11001). TRITC-labeled phalloidin (Sigma-Aldrich #P1951) was used at 1:100 dilution to visualize F-actin as described previously (Guild et al., 1997 (link)). The LysoTracker assay was performed as described in Dorogova et al. (2014) (link) (LysoTracker red DND-99 (Invitrogen, Molecular Probes, Basel, Switzerland). Ovaries were embedded with ProLong Gold anti-fade reagent with DAPI. Images were obtained using an AxioImager Z1 microscope with ApoTome attachment (Zeiss), AxioCam MR and AxioVision software (Zeiss, Germany).
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5

Quantitative Nerve Terminal Imaging

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All imaging was performed using a Zeiss Axio Z1 Imager with an Apotome attachment (removed for imaging sections, attached for imaging whole-mount tissue) and captured with Zen Blue Edition software (version 6.1.7). Each stain was performed in duplicate for each mouse and all tissue was coded prior to imaging. Every distal nerve identified by MBP and BTx staining was imaged in each diaphragm/TS. Z-stacks with a 0.4 μm interval were taken using a 63 × oil objective. For these images, 24–89 nerve terminals and 5–44 distal nerves were analysed per mouse. The distal nerve was defined as the nerve terminal, first internode and first NoR identified by a gap in MBP staining. When assessing complement deposition, if deposits were detected overlying the distal internode and/or NoR, this was scored as positive. To assess the integrity of proteins at the NoR, presence/absence analysis was performed. When assessing the integrity of paranodal markers AnkB, CASPR1 and NF155, presence was defined as both domains and absence was defined as a single domain or complete loss of staining.
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6

Quantifying Retrograde Labeled and Neuropeptide-Expressing Neurons

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The number of CTB+, AVP-ir, and CTB/AVP co-labeled neurons were counted using ImageJ (NIH; imagej.nih.gov/ij). Images were acquired using an Axiolmager fluorescence microscope with ApoTome attachment (Carl Zeiss Microscopy GmbH, Jena, Germany), Orca-R2 camera (Hamamatsu, Bridgewater, NJ, USA) and Zen software (Carl Zeiss Microscopy GmbH, Jena, Germany). Tiled confocal fluorescent images (2 × 2mm; 20μm Z-plane) encompassing the posterior bed nucleus of the stria terminalis (pBNST) and posterodorsal medial amygdala (MePD) were Z-stacked, and separated into red, green, and yellow channels using the ImageJ split channel function. CTB+ neurons were counted using the cell counter function in ImageJ from the red channel, AVP-ir neurons were counted from the green channel, and colabeled neurons were quantified from the yellow channel. The total number of colabeled cells in each image was then averaged across three non-overlapping sections in an evenly spaced series (90pm apart) for both the pBNST and MePD. Many AVP-ir cells were observed in the paraventricular (PVN) and supraoptic (SON) nuclei of the hypothalamus, however in no cases were any back-labeled CTB+ cell bodies co-expressing AVP observed in these regions. Thus, these regions were not further analyzed.
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7

Quantifying Microglia and Macrophages in Hippocampus

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The analysis of resident microglia and blood‐derived macrophages was performed by quantifying Cx3cr1‐GFP‐positive (Cx3cr1‐GFP+) and Ccr2‐RFP‐positive (Ccr2‐RFP+) cells in the entire dorsal DG region of the hippocampus (the granule cell layer including the subgranular zone) and the entire dorsal CA region of the hippocampus (the pyramidal cell layer from CA1‐3) (Fanselow and Dong, 2010; Qiu et al., 2007). For quantification of immunopositive cells in the DG and the CA regions, ten consecutive 0.5μm z‐stack images of the sections were acquired using Axio Imager M2 microscope with Apotome attachment (Carl Zeiss) at 20× magnification and compressed in a single image (Kadam et al., 2015). All immunopositive cells were counted in three to four sections per animal spaced 400 μm apart. The total number of cells was obtained by multiplying the number of cells by the sampling fractions. To evaluate the proliferation of microglia, 100 Cx3cr1‐GFP+ cells were quantified and examined for coexpression of Ki67.
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8

Quantitative Cell Invasion Assay

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For cell invasion assays, cells were cultured in the medium used for tumorsphere formation supplemented with 0.2% methylcellulose in a non-adhesive convex environment for 12 h at 37 °C and 5% CO2. Tumorspheres were mixed with collagen matrix (2.5 mg/ml) and incubated for 30 min at 37 °C prior to microscopic analysis. Time-lapse microscopy imaging was performed on a Zeiss AxioObserver Z1 microscope with a Plan-Apochromat ×40 /1.3 (NA = 1.3, working distance = 0.21 mm), a camera, and an Apotome attachment (Carl Zeiss, Germany). Mosaic images were collected using AxioVision software over a period of 20 h with a time resolution of 30 min.
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9

Brightfield Imaging of Live Zebrafish Embryos

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Brightfield images of live embryos were taken on the Zeiss SteREO Discovery V12 microscope at ×25 or the Zeiss Axio Imager Z1 microscope with the ×5 objective. Live embryos were anesthetized using a non-lethal dose of MS-222. Fixed embryos were deyolked in PBS, side-mounted in 80 % glycerol/20 % PBS, and imaged with the ×20 objective of a Zeiss Axio Imager Z1 microscope with a Zeiss ApoTome attachment and optimized by averaging five frames. For images where fluorescence levels were to be compared, exposure times were kept constant throughout the imaging of that experiment. All image modifications were performed in Adobe Photoshop with Gaussian filtering (0.3 pixel) and unsharp mask (50 %, 1 pixel) prior to being collated in Adobe Illustrator.
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10

Immunofluorescence Microscopy Protocol

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Images of immunofluorescence were captured using an Axio-imager Z2 microscope fitted with an apotome attachment for structured illumination (Carl Zeiss MicroImaging) and a Nikon Eclipse Ni2. 20X (0.8 NA), 40X (0.95 NA), and 63X (1.4 NA) objectives were used. Images were taken using Zen 3.2 (Zeiss) or NIS-Elements (Nikon). For measurements of AIS streptavidin fluorescence intensity, 20 neurons per timepoint per replicate were imaged and line scans were drawn using Zen 3.2 software. Images were exported to Fiji, Adobe Photoshop, and Adobe illustrator for figure presentation. Some figures were generated using Biorender.
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