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Phycoerythrin conjugated annexin 5

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Phycoerythrin conjugated Annexin V is a fluorescently labeled protein used for the detection of apoptosis in cells. Annexin V binds to phosphatidylserine, which is exposed on the cell surface during apoptosis. The phycoerythrin dye attached to the Annexin V protein allows for the visualization and quantification of apoptotic cells using flow cytometry or fluorescence microscopy.

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3 protocols using phycoerythrin conjugated annexin 5

1

Apoptosis Pathway Protein Analysis

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We purchased reagents from the following suppliers: kaempferol (3,4′,5,7-tetrahydroxyflavone), anti-β-actin antibody, essentially fatty acid-free bovine serum albumin (BSA), transferrin, Hoechst 33258, 7-amino-actinomycin D (7-AAD), and 5,5′,6,6′-tetrachloro-1,1′,3,3′-tetraethyl-imidacarbocyanine iodide (JC-1) (Sigma, St. Louis, MO, USA); selenium and DMEM/Ham’s F-12 nutrient mixture (DMEM/F-12; Gibco BRL, Gaithersburg, MD, USA); phycoerythrin conjugated Annexin V (BD Pharmingen, Franklin Lake, NJ, USA); antibodies against Bcl-2, Bcl-xL, Bax, FAS, FAS-L and α-tubulin (Santa Cruz Biotechnology, Santa Cruz, CA, USA); antibodies against cleaved caspase-9, cleaved caspase-3, cleaved caspase-7, cleaved PARP, Bik, Bak, Bim, Bad, Bid, Akt, and phospho-Akt (Cell Signaling, Beverly, MA, USA); antibodies against cytochrome c and caspase-8 (BD Biosciences, San Jose, CA, USA).
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2

Cell Signaling Pathway Analysis

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Kaempferol, essentially fatty acid-free bovine serum albumin, 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT), 7-amino-actinomycin D (7-AAD), phosphatidylinositol, transferrin and anti-β-actin antibody were obtained from Sigma (St. Louis, MO, USA); selenium and DMEM/Ham’s F-12 nutrient mixture (DMEM/F-12 were purchased from Gibco BRL (Gaithersburg, MD, USA)); [methyl-3H]thymidine, protein A-Sepharose and horse-radish peroxidase-conjugated anti-rabbit and anti-mouse IgG were from Amersham (Arlington Heights, IL, USA); antibodies against HRG, IGF-IRβ, p85 and ErbB3 were obtained from Santa Cruz Biotechnology (Santa Cruz, CA, USA); antibodies against Akt, phospho (P)-Akt, ERK-1/2 and P-ERK-1/2 were from Cell Signaling Technology (Beverly, MA, USA); anti-phosphotyrosine-RC20 (PY20) antibody linked to horse-radish peroxidase was purchased from BD Transduction Laboratories (Palo Alto, CA, USA); anti-IGF-II antibody was from Amano International Enzyme (Troy, VA, USA); recombinant human HRG-β and recombinant human IGF-II were purchased from R&D Systems, (Minneapolis, MN, USA); phycoerythrin-conjugated Annexin V was from BD Pharmingen, (Franklin Lake, NJ, USA); and [γ-32P]ATP was obtained from PerkinElmer Life and Analytical Sciences, Inc. (Boston, MA, USA).
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3

Apoptosis Detection in Virus-Infected Cells

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HeLa S3 cells were detached 80 h after adenovirus infection, with 0.25% trypsin and 1 mM EDTA, washed with PBS, and resuspended in 50 mM Tris-HCl (pH 8.0), 80 mM NaCl, 0.2% BSA, and 2.5 mM CaCl2. Cells were subsequently incubated with phycoerythrin-conjugated Annexin V (BD Biosciences, San Jose, CA, USA). Annexin V-positive cells were detected by flow cytometry at 564-606 nm, using a FACSCalibur flow cytometer (BD Biosciences).
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