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Mem 259

Manufactured by Abcam

MEM-259 is a monoclonal antibody that recognizes the CEACAM5 (Carcinoembryonic Antigen-Related Cell Adhesion Molecule 5) protein. CEACAM5 is a cell surface glycoprotein that is often overexpressed in certain types of cancer cells.

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5 protocols using mem 259

1

Exosome Immunophenotyping Using Antibodies

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Anti-CD9 antibody [MEM-61] and anti-CD63 antibody [MEM-259] were purchased from Abcam. Recombinant protein G from Escherichia coli, ≥90% (protein G), anti-human IgG antibody (anti-IgG), 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimidehydrochloride (EDC), N-hydroxyl-succinimide (NHS), and 11-mercaptoundecanoic acid (MUA) were all purchased from Sigma-Aldrich. ExoStdTM lyophilized exosome standard (human serum) (Exo) was bought from Biovision (Milpitas, USA). Deionized water was obtained from a Milli-Q purification system (18.2 mΩ at 25 °C). Phosphate-buffered saline (PBS, pH 7.4) and PBST (containing 0.05% Tween-20) were prepared in deionized water.
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2

Quantification of HBV DNA in Extracellular Vesicles

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Each aliquot (200 μL at 3.0 × 104 viral DNA copies/mL) of Sup, EV-, and EV+ fractions from primary human hepatocytes was mixed with an equal volume of PBS containing 1% bovine serum albumin (BSA) and 5 μg of one of the following: anti-CD9 antibody (M-L13; Becton, Dickinson and Company, Franklin Lakes, NJ), anti-CD63 antibody (MEM-259; Abcam, Cambridge, UK), anti-CD81 antibody (JS-81; Becton, Dickinson and Company), or anti-hemagglutinin (HA) tag antibody (12CA5(2); BioVision, San Francisco, CA), or with diluted serum (1:300) from a normal (HBV-naive) or HBs-immunized mouse. The resulting mixture was incubated for 16 hours at 4°C. Each fluid + antibody mixture then was combined with 50 μL of a 50% slurry of protein G–Sepharose 4 Fast Flow (GE Healthcare, Chicago, IL) and incubated with rotation at 4°C for 2 hours. The mixtures were centrifuged at 2300 × g for 20 seconds at 4°C, and the supernatants were discarded. The pellets were washed twice with 1% BSA in 10% Dulbecco’s modified Eagle medium. The pellets then were resuspended in 10% Dulbecco’s modified Eagle medium containing 1% BSA and used for quantification analysis of HBV DNA.
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3

Immunogold Labeling of CD63+ Microvesicles

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Microvesicle fractions resuspended in PBS obtained from ultracentrifugation of culture supernatants of CD4+ T cells after 72 hours of stimulation were bound to glow-discharged formvar-coated grids contrasted with 1% uranyl acetate. Immunogold labelling of vesicles for CD63 was performed by staining with mouse anti-human CD63 mAb MEM-259 (Abcam) followed by goat anti-mouse IgG coupled to 10 nm gold (BBInternational). Samples were viewed with a FEI™ Tecnai G20 transmission electron microscope operated at 120kV. Images were captured using an AMT XR60B (Deben) digital camera running Deben software.
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4

Extracellular Vesicle Detection Assay

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Each well of a protein A/G functionalized slide (Arrayit Corporation) was incubated with capture antibodies specific for either ASGR2 or CYP2E1, PBS washed, and blocked with 1 μL/well SuperBlock™ (Thermo Scientific). Plasma samples were mixed and centrifuged at 500 ×g for 15 min to remove debris, and supernatants were diluted 1:1 with PBS and then incubated on assay slides for 4 h at 37 °C. For each sample 4 μL of plasma was applied to each well, in triplicate. After incubation, all sample wells were aspirated and supplemented with 1 μL of detection probe [neutravidin functionalized gold nanorods conjugated with biotinylated anti-human CD63 antibodies (MEM-259, Abcam)] and PBS washed, and then replicate wells in each column of the assay slide were analyzed for nPES signal by far-field dark-field microscopy (Eclipse Ti-S inverted microscope; Nikon Instruments Inc).
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5

Immunogold Labeling of Microvesicles

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Microvesicle fractions resuspended in PBS obtained from ultracentrifugation of culture supernatants of CD4+ T cells after 72 h of stimulation were bound to glow-discharged formvar-coated grids contrasted with 1% uranyl acetate. Immunogold labeling of vesicles for CD63 was performed by staining with mouse anti-human CD63 mAb MEM-259 (Abcam), followed by goat anti-mouse IgG coupled to 10 nm gold (BB International). Samples were viewed with a FEI Tecnai G20 transmission electron microscope operated at 120 kV. Images were captured using an AMT XR60B (Deben) digital camera running Deben software.
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