Human FCRL1/FcRH1 Alexa Fluor® 700-conjugated Antibody

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FAB2049N-100UG
R&D Systems Antibodies
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Human FCRL1/FcRH1 Alexa Fluor® 700-conjugated Antibody Summary

Species Reactivity
Human
Specificity
Detects human FCRL1/FcRH1 in direct ELISAs and Western blots. In Western blots, no cross-reactivity with recombinant human (rh) FCRL2, 3, 4, or 5 is observed.
Source
Monoclonal Mouse IgG1 Clone # 282415
Immunogen
Mouse myeloma cell line NS0-derived recombinant human FCRL1/FcRH1
Ala17-His304
Accession # Q96LA6
Formulation
Supplied 0.2 mg/mL in a saline solution containing BSA and Sodium Azide.
Label
Alexa Fluor 700 (Excitation= 675-700 nm, Emission= 723 nm)

Applications

Recommended Concentration
Sample
Flow Cytometry
0.25-1 µg/106 cells
Human whole blood CD19+ B cells

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.

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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
Store the unopened product at 2 - 8 °C. Do not use past expiration date.

Background: FCRL1/FcRH1

Fc Receptor-Like 1 (FCRL1), also known as FcRH1, and IRTA5, is an approximately 50 kDa protein with sequence homology to classical Fc receptors. The type 1 transmembrane FCRL proteins contain from three to nine immunoglobulin-like domains. They are differentially expressed within the B cell lineage and can either promote or inhibit B cell proliferation and activation (1, 2). According to R&D Systems testing, FCRL1 binds to purified human IgG. Mature human FCRL1 consists of a 291 amino acid (aa) extracellular domain (ECD) with three Ig-like domains, a 21 aa transmembrane segment, and a 101 aa cytoplasmic domain with two immunotyrosine activation motifs (ITIMs) (3, 4). A charged glutamic acid within the transmembrane segment may mediate association with other signaling proteins. Alternative splicing may generate an isoform that lacks the transmembrane segment and an isoform that largely consists of the first two Ig-like domains (5). Mouse FCRL1 contains only two Ig-like domains, but it shares 62% aa sequence identity with homologous regions of the human FCRL1 ECD. FCRL1 is expressed on pre-B cells and naive B cells (6, 7). It is down‑regulated upon B cell activation but up‑regulated on memory B cells (6, 8). FCRL1 is expressed on many B cell lymphoma and leukemia tumor cells with the exception of B cell acute lymphoblastic leukemia (9‑11). Antibody crosslinking of FCRL1 triggers its tyrosine phosphorylation and augments B cell proliferation induced by the B cell receptor (6).

References
  1. Davis, R.S. et al. (2007) Annu. Rev. Immunol. 25:525.
  2. Maltais, L.J. et al. (2006) Nat. Immunol. 7:431.
  3. Miller, I. et al. (2002) Blood 99:2662.
  4. Davis, R.S. et al. (2001) Proc. Natl. Acad. Sci. 98:9772.
  5. Accession # Q96LA6.
  6. Leu, C.-M. et al. (2005) Blood 105:1121.
  7. Li, F.J. et al. (2008) Blood 112:179.
  8. Polson, A.G. et al. (2006) Int. Immunol. 18:1363.
  9. Du, X. et al. (2008) Blood 111:338.
  10. Kazemi, T. et al. (2008) Int. J. Cancer 123:2113.
  11. Kazemi, T. et al. (2009) Cancer Immunol. Immunother. 58:989.
Long Name
Fc Receptor-like 1
Entrez Gene IDs
115350 (Human); 229499 (Mouse); 680665 (Rat)
Alternate Names
BXMH1; CD307a antigen; CD307a; Fc receptor homolog 1; Fc receptor-like 1; FcRH1; FCRH1DKFZp667O1421; FCRL1; FcR-like protein 1; hIFGP1; IFGP family protein 1; IFGP1; IFGP1Fc receptor-like protein 1; Immune receptor translocation-associated protein 5; IRTA5; IRTA5immunoglobulin superfamily Fc receptor, gp42

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