Human CD28 Alexa Fluor® 350-conjugated Antibody
R&D Systems, part of Bio-Techne | Catalog # FAB3422U
Recombinant Monoclonal Antibody.
Key Product Details
Species Reactivity
Human
Applications
Flow Cytometry
Label
Alexa Fluor 350 (Excitation = 346 nm, Emission = 442 nm)
Antibody Source
Monoclonal Rabbit IgG Clone # 2946A
Product Specifications
Immunogen
S. frugiperda insect ovarian cell line Sf21-derived recombinant human CD28
Asn19-Pro152
Accession # P10747
Asn19-Pro152
Accession # P10747
Specificity
Detects human CD28 in direct ELISA.
Clonality
Monoclonal
Host
Rabbit
Isotype
IgG
Applications for Human CD28 Alexa Fluor® 350-conjugated Antibody
Application
Recommended Usage
Flow Cytometry
Titration recommended for optimal concentration
with starting range of 0.1-1 µg/1 million cells. Sample used for this
experiment was PBMC
lymphocytes with CD3 costain.
Please Note: Optimal dilutions of this antibody should be experimentally determined.
Formulation, Preparation, and Storage
Purification
Protein A or G purified from cell culture supernatant
Formulation
Supplied 0.2 mg/mL in a saline solution
containing BSA and Sodium Azide.
Shipping
The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage
Protect from light. Do not freeze.
- 12 months from date of receipt, 2 to 8 °C as supplied.
Background: CD28
CD28 and CTLA-4, together with their ligands B7-1 and B7-2, constitute one of the dominant costimulatory pathways that regulate T and B cell responses. CD28 and CTLA-4 are structurally homologous molecules that are members of the immunoglobulin (Ig) gene superfamily. Both CD28 and CTLA-4 are composed of a single Ig V‑like extracellular domain, a transmembrane domain and an intracellular domain. CD28 and CTLA-4 are both expressed on the cell surface as disulfide-linked homodimers or as monomers. The genes encoding these two molecules are closely linked on human chromosome 2 and mouse chromosome 1. Mouse CD28 is expressed constitutively on virtually 100% of mouse T cells and on developing thymocytes. Cell surface expression of mouse CD28 is down-regulated upon ligation of CD28 in the presence of PMA or PHA. In contrast, CTLA-4 is not expressed constitutively but is up-regulated rapidly following T cell activation and CD28 ligation. Cell surface expression of CTLA-4 peaks approximately 48 hours after activation. Although both CTLA-4 and CD28 can bind to the same ligands, CTLA-4 binds to B7‑1 and B7‑2 with a 20-100 fold higher affinity than CD28. CD28/B7 interaction has been shown to prevent apoptosis of activated T cells via the up‑regulation of Bcl‑xL. CD28 ligation has also been shown to regulate Th1/Th2 differentiation. Agonist activity has been reported using MAB4831 (4, 5).
References
- Lenschow, D.J. et al. (1996) Annu. Rev. Immunol. 14:233.
- Hathcock, K.S. and R.J. Hodes (1996) Advances in Immunol. 62:131.
- Ward, S.G. (1996) Biochem. J. 318:361.
- Nguyen, P. et al. (2003) Blood 13:4320.
- Orbach, A. et al. (2007) J. Immunol. 179:7287.
Alternate Names
CD28
Gene Symbol
CD28
UniProt
Additional CD28 Products
Product Documents for Human CD28 Alexa Fluor® 350-conjugated Antibody
Product Specific Notices for Human CD28 Alexa Fluor® 350-conjugated Antibody
This product is provided under an agreement between Life Technologies Corporation and R&D Systems, Inc, and the manufacture, use, sale or import of this product is subject to one or more US patents and corresponding non-US equivalents, owned by Life Technologies Corporation and its affiliates. The purchase of this product conveys to the buyer the non-transferable right to use the purchased amount of the product and components of the product only in research conducted by the buyer (whether the buyer is an academic or for-profit entity). The sale of this product is expressly conditioned on the buyer not using the product or its components (1) in manufacturing; (2) to provide a service, information, or data to an unaffiliated third party for payment; (3) for therapeutic, diagnostic or prophylactic purposes; (4) to resell, sell, or otherwise transfer this product or its components to any third party, or for any other commercial purpose. Life Technologies Corporation will not assert a claim against the buyer of the infringement of the above patents based on the manufacture, use or sale of a commercial product developed in research by the buyer in which this product or its components was employed, provided that neither this product nor any of its components was used in the manufacture of such product. For information on purchasing a license to this product for purposes other than research, contact Life Technologies Corporation, Cell Analysis Business Unit, Business Development, 29851 Willow Creek Road, Eugene, OR 97402, Tel: (541) 465-8300. Fax: (541) 335-0354.
For research use only
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