Human IL-3 R alpha /CD123 Alexa Fluor® 700-conjugated Antibody

  • Species Reactivity
  • Specificity
    Detects human IL-3 R alpha /CD123 in direct ELISAs and Western blots.
  • Source
    Monoclonal Mouse IgG1 Clone # 32703
  • Purification
    Protein A or G purified from hybridoma culture supernatant
  • Immunogen
    S. frugiperda insect ovarian cell line Sf 21-derived recombinant human IL-3 R alpha /CD123
    Lys20-Arg305, predicted
    Accession # P26951
  • Formulation
    Supplied in a saline solution containing BSA and Sodium Azide.
  • Label
    Alexa Fluor 700
  • Flow Cytometry
    5 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 Examples
Detection of IL‑3 R alpha /CD123 in Human Blood Lymphocytes by Flow Cytometry. Human peripheral blood lymphocytes were stained with Mouse Anti-Human HLA‑DR PE‑conjugated Monoclonal Antibody (Catalog # FAB4869P) and either (A) Mouse Anti-Human IL‑3 R alpha /CD123 Alexa Fluor® 700‑conjugated Monoclonal Antibody (Catalog # FAB301N) or (B) Mouse IgG1 Alexa Fluor 700 Isotype Control (Catalog # IC002N). View our protocol for Staining Membrane-associated Proteins.
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: IL-3 R alpha/CD123
IL-3 is a pleiotropic cytokine that can stimulate proliferation and differentiation of pluripotent hematopoietic stem cells as well as various lineage committed progenitors (1, 2). IL-3 exerts its activity through binding to a specific cell surface receptor known as IL-3 R. IL-3 R is a heterodimeric structure composed of a 70 kDa IL-3 R alpha subunit (CD123) and a 120-140 kDa IL-3 R beta subunit (CD131) (3, 4). IL-3 R alpha binds IL-3 with relatively low affinity. In the presence of IL-3 R beta, however, IL-3 R alpha has a much higher affinity for IL-3. It is not clear how signal transduction occurs following IL-3 binding. The IL-3 R alpha chain has a very short intracellular domain while the IL‑3 R beta chain has a very large cytoplasmic domain. The IL‑3 R beta chain is also shared by the receptors for IL-5 and GM-CSF. Cells known to express IL-3 receptors include hematopoietic progenitors, epithelial cells, double negative T cells, mast cells, basophils and blood monocytes (5).
  • References:
    1. Moore, M.A.S. et al. (1991) Blood 72:944.
    2. Warren, D.J. et al. (1988) J. Immunol. 140:94.
    3. Plant M. et al. (1989) Nature 339:150.
    4. Budel, L.M. et al. (1990) Blood 75:1439.
    5. Schrader, J.W. et al. (1988) In Interleukin-3: The Panspecific hemopoietin (ed. J.W. Schrader), Academic Press, San Diego, CA.
  • Long Name:
    Interleukin 3 Receptor alpha
  • Entrez Gene IDs:
    3563 (Human); 16188 (Mouse)
  • Alternate Names:
    CD123 antigen; CD123; hIL3Ra; hIL-3Ra; IL-3 receptor subunit alpha; IL3R alpha; IL-3R subunit alpha; IL3R; IL3RA; IL-3Ra; IL-3R-alpha; IL3RAY; IL3RX; IL3RY; interleukin 3 receptor, alpha (low affinity); interleukin-3 receptor subunit alpha; MGC34174
Related Research Areas
Isotype Controls
Description Application Cat# Citations Images  

Mouse IgG1 Alexa Fluor® 700-conjugated Antibody

Ctrl IC002N  
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Staining Reagents
Description Application Cat# Citations Images  

Flow Cytometry Staining Buffer (1X)

Flow FC001 3
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Flow Cytometry Mouse Lyse Buffer (10X)

Flow FC003 1
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Flow Cytometry Human Lyse Buffer (10X)

Flow FC002 1
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