Product Information

Contents: Functional Grade Purified anti-human CD8
Catalog Number: 16-0086
Sizes: 50 ug, 500 ug
Formulation: Phosphate buffer pH 7.2,
150 mM NaCl, No NaN₃
Storage Conditions: Store at 4°C.
Avoid repeated freeze/thaw cycles.
KEEP CONTENT STERILE.
Endotoxin Level: Less than 0.001 ng/ug antibody, as determined by the LAL assay.
Clone: OKT8 (OKT-8)
Isotype: Mouse IgG2a

Available Formats of This Product
Cat. No.	Format	Excite (nm)	Emit (nm)	Reported Applications
14-0086	Affinity Purified anti-human CD8	N/A	N/A	FC
16-0086	Functional Grade* Purified anti-human CD8	N/A	N/A	FC
13-0086	Biotin anti-human CD8	N/A	N/A	FC
11-0086	Fluorescein isothiocyanate (FITC) anti-human CD8	488	518	FC
12-0086	Phycoerythrin (PE) anti-human CD8	488	575	FC
17-0086	Allophycocyanin (APC) anti-human CD8	633	660	FC
51-0086	Alexa Fluor® 647 anti-human CD8	633	668	FC
53-0086	Alexa Fluor® 488 anti-human CD8	488	519	FC
56-0086	Alexa Fluor® 700 anti-human CD8 (APC-Cy5.5 Equivalent)	633	723	FC
57-0086	Pacific Blue® anti-human CD8	402	421	FC
*Functional Grade™ (FG™) Purified: Azide-free, sterile-filtered, and endotoxin < 0.001 ng/µg (unless otherwise noted). *Functional Grade™ (FG™) Biotin: Azide-free, sterile-filtered, and endotoxin < 0.05 ng/µg. Purified: Contains azide, not sterile-filtered, and not endotoxin tested.
Flow Cytometry Product Notes: Test Sizes: To accommodate multicolor flow cytometry, eBioscience is in the process of reducing test size volumes from 20 µl to 5 µl. Please check your antibody vial for the recommended test size. Fluorochrome Replacements: eBioscience is in the process of replacing all Pacific Blue® and APC-Alexa Fluor® 750 conjugated products with eFluor™ 450 and APC-eFluor™ 780 conjugated products, respectively.

Custom Product Requests
Need a custom product? Download the Custom Product Request Form and submit completed form to customs@ebioscience.com.

Questions? Please consult our answers to frequently asked questions at http://www.ebioscience.com/faq.

Description

The OKT8 monoclonal antibody reacts with the human CD8a molecule, an approximately 32-34 kDa cell surface receptor expressed either as a heterodimer with the CD8 β chain (CD8 αβ) or as a homodimer (CD8 αα). A majority of thymocytes and a subpopulation of mature T cells and NK cells express CD8a. CD8 binds to MHC class I and through its association with protein tyrosine kinase p56lck plays a role in T-cell development and activation of mature T cells. Preliminary testing indicates that OKT8 and two other mouse anti-human CD8 antibodies (clone RPA-T8, Cat. No.14-0088 and clone HIT8a, Cat. No.14-0089) do not compete with each other for binding to human peripheral blood leukocytes by flow cytometric analysis, suggesting that they do not bind to similar epitopes or block each other by steric hindrance.

Applications Reported

For research use only, not for diagnostic or therapeutic use. This OKT8 (OKT-8) antibody has been reported for use in flow cytometric analysis.

Applications Tested

This OKT8 (OKT-8) antibody has been tested by flow cytometric analysis of human peripheral blood leukocytes. This can be used at less than or equal to 0.25 μg per million cells in a 100 μl total staining volume. It is recommended that the antibody be carefully titrated for optimal performance in the assay of interest.

References

Kay HD, Horwitz DA. 1980. Evidence by reactivity with hybridoma antibodies for a probable myeloid origin of peripheral blood cells active in natural cytotoxicity and antibody-dependent cell-mediated cytotoxicity. J Clin Invest. 66(4):847-51.

Sayos J, Wu C, Morra M, Wang N, Zhang X, Allen D, van Schaik S, Notarangelo L, Geha R, Roncarolo MG, Oettgen H, De Vries JE, Aversa G, Terhorst C.The X-linked lymphoproliferative-disease gene product SAP regulates signals induced through the co-receptor SLAM. Nature. 1998 Oct 1;395(6701):462-9. (OKT8, IP, PubMed)

Thomas Y, Sosman J, Irigoyen O, Friedman SM, Kung PC, Goldstein G, Chess L. 1980. Functional analysis of human T cell subsets defined by monoclonal antibodies. I. Collaborative T-T interactions in the immunoregulation of B cell differentiation. J Immunol. 125(6):2402-8.

Campanelli R, Palermo B, Garbelli S, Mantovani S, Lucchi P, Necker A, Lantelme E, Giachino C. 2002. Human CD8 co-receptor is strictly involved in MHC-peptide tetramer-TCR binding and T cell activation. Int Immunol. 14(1):39-44.

Related Products

Cat. 11-4011  FITC Anti-Mouse IgG
Cat. 13-4013  Biotin Anti-Mouse IgG (clone Polyclonal)
Cat. 11-4317  Streptavidin-FITC (Fluorescein isothiocyanate)
Cat. 12-4317  Streptavidin-PE (Phycoerythrin)
Cat. 17-4317  Streptavidin Allophycocyanin (SA-APC)
Cat. 16-4724  Functional Grade Purified Mouse IgG2a, K Isotype Control