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Cyanine 5

Manufactured by Jackson ImmunoResearch
Sourced in United States

Cyanine 5 is a fluorescent dye commonly used in molecular biology and biotechnology applications. It is a member of the cyanine dye family and has a maximum excitation wavelength of approximately 650 nm and a maximum emission wavelength of approximately 670 nm. Cyanine 5 can be used for labeling and detection of various biomolecules, such as proteins, nucleic acids, and other cellular components.

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5 protocols using cyanine 5

1

Muscle Tissue Immunostaining and Histological Analysis

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Muscle samples were fixed in 3.5% formaldehyde, embedded in paraffin and cut into 5 μm-thick sections. Sections were stained with an antibody against TWEAK (sc-5558, 1:100, SantaCruz Biotechnology). Bound primary antibodies were detected by immunofluorescence using secondary antibodies conjugated with Cyanine5 (Jackson ImmunoResearch Laboratories). Nuclei were stained with Bisbenzimid (Hoechst 33258). Control sections were treated similarly, except for the primary antibody, which was omitted.
For Ladewig staining, sections were brought to water with xylene and ethanol and treated with Ladewig's and Weigert's solution. For Sirius-red staining, sections were treated with Sirius-red solution (#365548, Sigma-Aldrich) for one hour and washed with acetic acid.
Digital evaluation and quantification were done on ImageJ software (National Institutes of Health, Bethesda, MD, USA.)
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2

Antibody Validation and Characterization Protocol

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Antibodies purchased from commercial suppliers are as follows: FilaminA mouse monoclonal (AbNova, H00002316-M01, used at 1:1000); FilaminA mouse monoclonal (USBiological, F4510, used at 1:1000); NG2 mouse monoclonal (Upstate, 05-710, clone 132.38, used at 1:500); NG2 rabbit polyclonal (Chemicon, ab5320, used at 1:500); GFP mouse monoclonal (Abcam, ab-1218, used at 1:500); Rat anti-Myc tag antibody (JAC6-Serotec, used at 1:500). The mouse monoclonal antibodies agains α-tubulin and β-tubilin were a gift from Dr. Laurence Lafanachère, Institute for Advanced Biosciences, Grenoble, France (used at 1:5000 on western blot and at 1:1000 for IF). Mouse anti-Myc tag, A2B5, O4 hybridomas were amplified in the laboratory. Affinity­-purified chicken and guinea pig antibody against RefilinA and RefilinB were obtained as previously described (Gay et al., 2011b (link)). Anti-Vimentin (Santa Cruz, sc-373717) was used at 1:1000. Alexa Fluor 546 Phalloidin (Invitrogen; A22283) was used at 1:250. Secondary antibodies: conjugated with Alexa Fluor 488 (Molecular Probes), Cyanine3 or Cyanine5 (Jackson ImmunoResearch) were all used at 1:2000. Secondary antibodies coupled to horseradish peroxidase were from Jackson ImmunoResearch (115-035-174, 111-035-144 and 112-035-175) and used at 1:5000.
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3

Immunofluorescence Staining of Brain Sections

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Embryos were fixed by transcardiac perfusion with freshly-prepared 4% paraformaldehyde (Sigma). Brains were dissected, and 100 mm sections were prepared using a Leica VT1000S vibrosector. Slices were transferred into PBS with 0.5 μg/mL sodium azide (Sigma), then blocked with PBS supplemented with 3% horse serum (Invitrogen) and 0.3% Triton X-100 (Sigma) during 1 h, and incubated overnight at 4°C with the following primary antibodies: chicken GFP (Abcam, 1:2,000), rabbit Pax6 (Covance, 1:1000), Sox2 (Santa Cruz Biotechnology, 1:500), PCNA (Millipore, 1:200), phospho-Histone H3 (Abcam, 1:100), Tbr2 (Abcam, 1:500), Neurod2 (Abcam, 1:500), or mouse β3-tubulin (Tuj1 epitope, Covance, 1:1000). After three washes with PBS/0.1% Triton X-100, slices were incubated in PBS for 1 h at room temperature and incubated 2 h at room temperature with the appropriated Alexa 488 (1:1,000, Molecular Probes), Cyanine 3 or Cyanine 5 (1:400, Jackson ImmunoResearch) secondary antibodies. Sections were again washed three times with PBS/0.1% Triton X-100, stained with Hoechst (bisBenzimide H 33258, Sigma) for 5 min and washed twice in PBS. The sections were next mounted on a Superfrost slide (Thermo Scientific) and dried using a brush before adding Glycergel mounting medium (Dako). Imaging was performed using a Zeiss LSM780 confocal microscope controlled by the Zen Black software (Zeiss).
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4

RNAscope-Based Multiplex Fluorescent Imaging

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The RNAscope TM Multiplex Fluorescent V2 kit (Biotechne, MN, USA) was used according to the manufacturer's instructions. All laboratory solutions were prepared in advance with autoclaved water at 0.1% DEPC (Sigma-Aldrich, MO, USA; D5758) to avoid any contamination by RNAses and DNAses. Our target was revealed with the Plat probe, revealing the plat gene encoding tPA (Biotechne, MN, USA; 586951) coupled with Opal 520 fluorophore (Akoya, MA, USA; SKU FP1487001KT; 1/5000). At the end of the protocol, we carried out immunostaining steps with the primary antibodies incubated overnight at 4 °C (anti-CD31 antibody, BD Biosciences; 555024 1/500; anti-phalloidin antibody, Invitrogen N21479 1/300). After 3 washes in 1 × PBS, the appropriate secondary antibodies coupled with Cyanine 3 or Cyanine 5 (1/800 Jackson Immunoresearch, West Grove, CA, USA) were incubated at room temperature for 90 min. Once washed, the slides were mounted with coverslip and mounting medium with DAPI (Fluoromont-G; Thermofisher, MA USA; 15596276).
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5

Fluorescent Labeling and Imaging of Exosome Uptake in Neurons

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N2a stably overexpressing GFP-CD63 were fixed at room temperature for 20 min using 4% paraformaldehyde (PFA) in PBS, permeabilized 30 min with 0.05% saponin in PBS-3% BSA (Bovine Serum Albumin, Sigma). Labelling with mouse anti-LBPA antibody was revealed using Cyanin 5-labelled anti-mouse antibody (Jackson Immunoresearch 0.2 µg/ml). Primary and secondary antibodies were diluted in PBS-3% BSA.
After incubation with exosomes, neurons were fixed using 4% PFA, 4% sucrose in PBS. After extensive washes in PBS, cells were permeabilized for 10 min at 4°C using PBS containing 0.1% Triton X-100. Cells were incubated in PBS containing 3% goat pre-immune serum (GPI, Sigma-Aldrich) and stained with the indicated primary antibodies and with secondary antibodies conjugated to either Alexa Fluor 488, Alexa Fluor 594 or Cyanine 5 (Jackson Immunoresearch 0.2 µg/ml). Primary and secondary antibodies were diluted in PBS 1% GPI. Nuclei were stained with Hoechst (Sigma).
Coverslips were mounted in Mowiol (Calbiochem) and observed using epifluorescence (Axiovert 200 M, Zeiss) or confocal microscopy (LAS AF – TCS SPE, Leica or LSM 710, Zeiss using Zen software). Some figures show acquisition in one given plan, others present maximal intensity projections (cf. figure legends). Image files were processed with ImageJ.
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