Human PBMCs were stained with 5 uL  (solid line) or 0.125 ug APC Mouse IgG2a isotype control.

Human Anti-CD3 Antibody [OKT3]

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Species: Human
Tested Applications: Flow Cytometry
Available Conjugates: FITC ;Unconjugated ;APC ;PerCP-Cy5.5 ;PE ;PE-Cy7 ;Qfluor 710 ;V450
Isotype: Mouse IgG2a kappa
Mass Spec Validated?: Not MS Validated

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Datasheets and Documentation
Product Datasheet
SKU: QAB5-F-25Tests
CD3 General Information
Alternate Names
Leu-4, T3
Curated Database and Bioinformatic Data
Gene SymbolCD3E
Entrez Gene ID916
Ensemble Gene IDENSG00000198851
RefSeq Protein Accession(s)NP_000724
RefSeq mRNA Accession(s)NM_000733,
RefSeq Genomic Accession(s)NC_018922, NG_007383, NC_000011
UniProt ID(s)P07766
UniGene ID(s)P07766
HGNC ID(s)1674
Cosmic ID(s)CD3E
KEGG Gene ID(s)hsa:916
PharmGKB ID(s)PA26216
General Description of CD3.
The OKT3 antibody is specific for human CD3e, also known as CD3 epsilon, a 20 kDa subunit of the T cell receptor complex along with CD3 gamma and CD3 delta. These integral membrane protein chains assemble with additional chains of the T cell receptor (TCR), as well as CD3 zeta chain, to form the T cell receptor - CD3 complex. Together with co-receptors CD4 or CD8, the complex serves to recognize antigens bound to MHC molecules on antigen-presenting cells. These interactions promote T cell receptor signaling (T cell activation), inducing a number of cellular responses including proliferation, differentiation, production of cytokines or activation-induced cell death. CD3 is differentially expressed during thymocyte-to-T cell development and on all mature T cells.The OKT3 antibody is a widely used phenotypic marker for human T cells. In addition, as the CD3e subunit of the TCR complex contains intracellular signaling domains, binding of OKT3 antibody to CD3e can induce cell activation. A recent publication of the crystal structure of a CD3e-mitogenic antibody complex provides further insight as to the action of commonly used agonist antibodies, as well as specific epitope-binding data for the widely used human CD3 antibodies OKT3 and UCHT1 (Fernandes, R.A. et al. 2012. J. Biol. Chem. 287: 13324-13335). OKT3 has also been shown to be cross-reactive with Chimpanzee CD3 and has been used for in vitro activation of T cells in this species. Please choose the appropriate format for each application.

Human Anti-CD3 Antibody Product Attributes

Species: Human
Cross Reactivity: chimpanzee
Tested Applications: Flow Cytometry.
Application Notes: 5 ul per test where one test represents staining of a cell sample in a final volume of approximately 100 uL. The number of cells within a sample must be experimentally determined, but ranges between 1x105 to 1x108 cells.
Clonality: Monoclonal Antibody
Anti-CD3 Antibody Clone: OKT3
Clone OKT3 Host and Isotype: Mouse IgG2a kappa
Buffer and Stabilizer: 10 mM NaH2PO4, 150 mM NaCl, 0.09% NaN3, 0.1% gelatin, pH7.2
Antibody Concentration: 5 uL /test
Storage Conditions: 2-8C protected from light. Stable for 12 Months. Do Not Freeze.

CD3 Previously Observed Antibody Staining Patterns

Observed Antibody Staining Data By Tissue Type:

Variations in CD3 antibody staining intensity in immunohistochemistry on tissue sections are present across different anatomical locations. An intense signal was observed in lymphoid tissue in appendix and non-germinal center cells in the lymph node and tonsil. More moderate antibody staining intensity was present in lymphoid tissue in appendix and non-germinal center cells in the lymph node and tonsil. Low, but measureable presence of CD3 could be seen in. We were unable to detect CD3 in other tissues. Disease states, inflammation, and other physiological changes can have a substantial impact on antibody staining patterns. These measurements were all taken in tissues deemed normal or from patients without known disease.

Selected References

Haga-Friedman A, Horovitz-Fried M, and Cohen CJ. Jun 2012. J. Immunol. 188:5538-5546. (in vitro activation)Bikker A, Moret FM, Kruize AA, Bijlsma JWJ, Lafeber FPJG, and van Roon JAG. Jun 2012. Rheumatology 51:996-1005 (in vitro activation)Bagnara D, Kaufman MS, Calissano C, et al. 2011. Blood. 117: 5463-5472. (in vivo depletion)Nguyen V, Cao L, Lin JT, Hung N, Ritz A, Yu K, Jianu R, Ulin SP, Raphael BJ, Laidlaw DH, Brossay L, and Salomon AR. 2009. Mol. Cell. Proeomics. 8: 2418-2431. (in vitro activation)Bibollet-Ruche F, McKinney BA, Duverger A, Wagner FH, Ansari AA, and Kutsch O. 2008. J. Virol. 82(20): 10271-10278. (in vitro activation - Chimpanzee)Roura-Mir C, Catalfamo M, Cheng TY, Marqusee E, Besra GS, Jaraquemada D, and Moody DB. 2005. J. Immunol. 174:3773-3780 (Immunohistochemistry - Acetone fixed frozen sections)Sato Y, Mukai K, Watanabe S, Goto M, and Shimosato Y. 1986. Am. J. Pathol. 125(3):431-435. (Immunohistochemistry - Paraffin embedded sections)

Limitations and Warranty

enQuire Bio's Human Anti-CD3 Monoclonal is available for Research Use Only. This antibody is guaranteed to work for a period of two years when properly stored.

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