Human CD28 PE-conjugated Antibody

Discontinued Product

FAB342P has been discontinued.
Detection of CD28 in Human Blood Lymphocytes by Flow Cytometry.
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Product Details
Citations (2)
FAQs
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Human CD28 PE-conjugated Antibody Summary

Species Reactivity
Human
Specificity
Detects human CD28 in Western blots. In Western blots, this antibody does not cross-react with recombinant mouse (rm) CD28, recombinant human CTLA-4, or rmCTLA-4.
Source
Monoclonal Mouse IgG1 Clone # 37407
Purification
Protein A or G purified from ascites
Immunogen
S. frugiperda insect ovarian cell line Sf 21-derived recombinant human CD28
Asn19-Pro152
Accession # P10747
Formulation
Supplied in a saline solution containing BSA and Sodium Azide.
Label
Phycoerythrin

Applications

Recommended Concentration
Sample
Flow Cytometry
10 µL/106 cells
See below

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Data Example

Flow Cytometry Detection of CD28 in Human Blood Lymphocytes by Flow Cytometry. View Larger

Detection of CD28 in Human Blood Lymphocytes by Flow Cytometry. Human peripheral blood lymphocytes were stained with Mouse Anti-Human CD3 epsilon APC‑conjugated Monoclonal Antibody (Catalog # FAB100A) and either (A) Mouse Anti-Human CD28 PE‑conjugated Monoclonal Antibody (Catalog # FAB342P) or (B) Mouse IgG1 Phycoerythrin Isotype Control (Catalog # IC002P). View our protocol for Staining Membrane-associated Proteins.

Reconstitution Calculator

Reconstitution Calculator

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Preparation and Storage

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 mouse 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 upregulation of Bcl-xL. CD28 ligation has also been shown to regulate Th1/Th2 differentiation.

Entrez Gene IDs
940 (Human); 12487 (Mouse); 102146670 (Cynomolgus Monkey)
Alternate Names
CD28 antigen (Tp44); CD28 antigen; CD28 molecule; CD28; MGC138290; T-cell-specific surface glycoprotein CD28; Tp44

Product Datasheets

Citations for Human CD28 PE-conjugated Antibody

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

2 Citations: Showing 1 - 2
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  1. Long-lasting inhibitory effects of fetal liver mesenchymal stem cells on T-lymphocyte proliferation.
    Authors: Giuliani M, Fleury M, Vernochet A, Ketroussi F, Clay D, Azzarone B, Lataillade JJ, Durrbach A
    2011;6(5):e19988.
    Species: Human
    Sample Types: Whole Cells
    Applications: Flow
  2. Immunoregulation of autocrine prolactin: suppressing the expression of costimulatory molecules and cytokines in T lymphocytes by prolactin receptor knockdown.
    Authors: Xu D, Lin L, Lin X
    Cell. Immunol., 2010;263(1):71-8.
    Species: Human
    Sample Types: Whole Cells
    Applications: Flow

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