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Alexa 488 or 568

Manufactured by Thermo Fisher Scientific

Alexa Fluor 488 and Alexa Fluor 568 are fluorescent dyes commonly used in biological research. They are synthetic dyes derived from the structure of the natural dye fluorescein. Alexa Fluor 488 and 568 dyes exhibit high brightness, photostability, and pH-insensitivity, making them suitable for a variety of fluorescence-based applications.

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12 protocols using alexa 488 or 568

1

Immunohistochemical Analysis of Drosophila Gut

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The immunofluorescence assay was performed as described [33 (link)]. Flies were fed with 5% sucrose solution with or without rotenone for 12 h. Intestines were dissected in PBS and fixed with 4% paraformaldehyde for 25 min at room temperature. The samples were blocked with a blocking solution (PBS with 0.3% Triton X-100, 0.2% goat serum and 0.1% fetal calf serum) for 25 min, incubated in primary antibodies overnight at 4 °C, and washed in PBS supplemented with 0.3% Triton X-100 (PBST). Then the samples were incubated with the secondary antibodies conjugated with Alexa 488 or 568 (Thermo Fisher, 1:1000, Waltham, MA) for 2 h at room temperature. Primary antibodies were α-syn (Novus Biologicals, 1:1,000, Centennial, CO), phospho-histone 3 (Millipore, 1:1,000, Burlington, MA), Dlg (DHSB, 1:50, Iowa City, IA) and phospho-Jun N-terminal Kinase (phospho-JNK) (Millipore, 1:200), while nuclear DNA was detected by DAPI (Thermo Fisher). All immunostained samples were mounted with Vectashield (Vector Laboratories, Newark, CA), and images were observed by confocal microscopy (Olympus Fluoview FV3000, Shinjuku, Tokyo, Japan) and processed using Adobe Photoshop (San Jose, CA).
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2

Immunohistochemical Profiling of Kidney Tissue

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Kidney tissues were fixed in a 4% paraformaldehyde solution (FUJIFILM Wako Pure Chemical Corporation, Osaka, Japan), embedded in paraffin, sectioned, and stained with haematoxylin-eosin using standard methods. Immunostaining was carried out using a BlueMap Kit and automated Discovery System (Roche) or manually for immunofluorescence staining.
The following primary antibodies were used: anti-SALL1 (Perseus Proteomics, Tokyo, Japan), anti-WT1 (Santa Cruz Biotechnology), anti-WT1 (Abcam), anti-cytokeratin (Sigma-Aldrich), anti-E-cadherin (BD Sciences), anti-SIX2 (Proteintech, Rosemont, IL), and anti-SALL1 (Abcam), which recognizes the C-terminus of SALL1. Secondary antibodies were conjugated with Alexa 488 or 568 (Thermo Fisher Scientific), and the nuclei were stained with 4′,6-diamidino-2-phenylindole (DAPI). Images were acquired using an LSM780 confocal microscope (Zeiss, Oberkochen, Germany).
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3

Indirect Immunofluorescence Staining Protocol

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Indirect immunofluorescence staining was performed as described in previous studies (Oppel et al., 2019 (link), 2011 (link); Ball et al., 2017 (link)). Primary antibodies used were pan-cytokeratin (AE1/AE3; Novus Biologicals #NBP2-29429; 1:200) and tri-methyl-Histone H3 (Lys27) (C36B11; Cell Signaling Technology #9733; 1:400). Secondary antibodies used were goat anti-rabbit-IgG and goat anti-mouse-IgG conjugated with Alexa 488 or 568 (Life Technologies; 1:400).
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4

Quantification of DNA Damage Markers

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Cells were fixed in 4% paraformaldehyde for 30 min at room temperature. Permeabilization was carried out in 0.2% Triton X-100 in phosphate-buffered saline for 10 min at room temperature. After 1 h of saturation in 2% bovine serum albumin, immunostaining was performed using γH2AX (Millipore, Burlington, MA, USA), 53BP1 (Cell Signaling, Danvers, MA, USA), and γ-tubulin (Millipore). These antibodies were revealed via secondary antibodies coupled to Alexa 488 or 568 (Life Technologies). Nuclear staining was performed by adding 1/2000 DAPI (1 mg/mL, Life Technologies) in phosphate-buffered saline for 10 min. Slides were then analyzed with a Zeiss LSM710 confocal laser scanning microscope (60× magnification). Images were collected in the Z direction at 0.80 mm intervals and quantified using the ImageJ plug-in as described previously [14 (link)].
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5

Immunohistochemical Analysis of Tau Proteins

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Sagittal (5 µM) brain slices were deparaffinized and unmasked using citrate buffer (3.75 mM acid citrate, 2.5 mM disodium phosphate, pH 6) for 10 min in a domestic microwave. The slices were submerged for 1 h in 1% horse serum (Vector Laboratories), and the primary antibodies were incubated overnight at 4°C in the presence of PBS-0.2% Triton using the following primary antibodies: total Tau (Tau CTer) and Tau1 antibodies (Galas et al., 2006 (link)) and the phospho-histone H2A.X (Ser 139) antibody from Millipore.
These antibodies were revealed via secondary antibodies coupled to Alexa 488 or 568 (Life Technologies). The sections were counterstained and mounted with Vectashield/DAPI (Vector Laboratories). 4′,6-diamidino-2-phenylindole (DAPI) was used as a chromatin counterstain.
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6

Drosophila Ovary Immunostaining Protocol

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Drosophila ovaries were dissected and immunostained as described previously (Yang et al., 2015 (link)). Briefly, ovaries were fixed in 4% paraformaldehyde for 15 min, and blocked in 5% normal goat serum in PBT (10 mM NaH2PO4, 175 mM NaCl, pH 7.4, 0.1% Triton X-100). The following primary antibodies were used: rabbit anti-pMad (1:1000, gift from Ed Laufer, Columbia University Medical Center, New York), rabbit anti-β-galactosidase (1:3000; MP Biologicals, 0855976), mouse anti-α-Spectrin (1:50; DSHB), rabbit anti-GFP (1:1000; Life, A11122), mouse anti-Flag (1:300; Sigma, F1804). Secondary antibodies, including goat anti-rabbit, anti-mouse IgGs, conjugated to Alexa (488 or 568) (Molecular Probes) were used at a dilution of 1:300 and tissues were also stained with 0.1 mg/ml DAPI (4’,6’-diamidino-2-phenylindole; Sigma) for 5 min. Images were collected using either a Zeiss LSM510/LSM 800 or Nikon A1 confocal microscope system. All acquired images were processed in Adobe Photoshop and Illustrator.
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7

Immunostaining of Cardiac Tissue Sections

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Heart tissue was embedded in tissue freezing media (Triangle Biomedical Science) snap-frozen in liquid nitrogen and sectioned in the coronal plane using Leica CM1900 cryostat (Leica Microsystems, Bannockburn, IL, USA). Coronal and axial tissue sections (5 to 7 μm thickness) were mounted on positively charged glass slides and fixed/permeabilized in a 1:1 mixture of acetone and ethanol. Sections were blocked with 3% BSA in PBS and incubated with primary antibodies against α-MHC (Abcam), HDAC1, HDAC2, α-SMA (Abcam), CD90 (BD), and Vimentin (Abcam). Specific staining was visualized using corresponding secondary antibodies conjugated with Alexa 488 or 568 (Molecular Probes). Nuclei were stained with DAPI, 4′ 6-diamidino-2-phenylindole (Life Technologies).
Cells were fixed/permeabilized in a 1:1 mixture of acetone and ethanol. Cells were blocked with 3% BSA in PBS and stained with primary antibodies. Corresponding secondary antibodies were conjugated with Alexa-488 or Alexa 568 (Molecular Probes). Nuclei were stained with DAPI, 4′ 6-diamidino-2-phenylindole (Life Technologies).
Fluorescent images were captured using Leica TCS SPE confocal system configured with Leica DM 2500 microscope. Excitation maximums of 488 nm, 532 nm, and 405 nm, were used for image acquisition. Images were processed using LAS AF software (Leica Microsystems).
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8

Ovary Development Imaging Protocol

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Females were fattened overnight on yeasted vials, then ovaries were dissected and fixed. In situ hybridizations were performed as previously described in (Wang et al., 2006 ; Zimmerman et al., 2013 (link)). Antibody stainings were performed in NP40 buffer as described in (McDonald and Montell, 2005 (link)), but some antibodies were pre-absorbed on ovaries prior to being used in the staining reaction. Antibodies used were: mouse anti-Armadillo (beta-catenin, N27A1, DSHB) diluted 1:25, mouse anti-Fas3 (Fas3, DSHB) diluted 1:10, rabbit anti-GFP diluted 1:1000 (Invitrogen), rabbit anti-Dhr4 diluted 1:50 ((King-Jones et al., 2005 (link)) a gift from King-Jones and Thummel), rabbit anti-CG10126 preabsorbed on ovaries at 1:100 and used diluted to 1:500 for staining (Susan Spencer), and guinea pig anti-PH4αEFB preadsorbed for 2 h at 1:200 and used at 1:2000 (Deborah Andrew). Secondary antibodies used anti-mouse or anti-rabbit conjugated to Alexa 488 or 568 diluted 1:400 (Invitrogen). DAPI (Sigma) 1:1000 was used to mark nuclei. Images were acquired using a Zeiss AxioImager microscope using ApoTome optical sectioning and processed through AxioVision, except Fig. 7I–K, which were obtained and rendered on a Leica SP5 laser scanning confocal microscope.
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9

Immunostaining of Drosophila Embryos

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Dechorionated embryos were fixed at the interface of heptane and either 18.5% paraformaldehyde (Electron Microscopy Sciences) (Postner and Wieschaus, 1994 (link)) for 30 min for actin cap staining or 4% paraformaldehyde for 70 min for mito-tagged embryo staining, in 0.1 M sodium phosphate buffer (pH 7.4). The embryos were manually devitellinized and stained with rabbit anti-GFP (1:1000, Invitrogen) and/or anti-dsRed (1:500, Invitrogen). Alexa 546 or 647-phalloidin (1:200, Invitrogen), or secondary antibodies conjugated with Alexa 488 or 568 (Invitrogen), were used at 1:500. Coronin peptide antibody was used at 1:100 dilution. Coronin peptide antibody was generated by GenScript as peptide-KLH conjugation in New Zealand rabbits (sequence in Table 3). The affinity-purified antibody was used at 1:100 dilution (~10 μg/mL). Embryos were mounted in ProLong Gold (Life Technologies). Olympus Fluoview FV3000 confocal laser scanning microscopy was used for immunostained embryos imaging. Exposure settings of 8 or 12 ms/pixel were used for image acquisition.
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10

Immunostaining of Differentiated Cells

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Differentiated cells were fixed in 4% paraformaldehyde in PBS for 20 min. Immunostaining was carried out using standard protocols. Primary antibodies and dilutions were as follows: β-tubulin type III monoclonal (TuJ1, 1:500; Sigma, St. Louis, MO), GFAP polyclonal (1:1,000; DAKO, Carpenteria, CA), O4 (1:50 hybridoma supernatant; gift from De Vellis lab). Cells were then reacted with appropriate secondary antibodies (Alexa 488 or 568, Invitrogen); 1:2000) and Hoescht nuclear stain (1:5000).
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