FCRL3/FcRH3 Antibody

Human peripheral blood lymphocytes were stained with Goat Anti-Human FCRL3/FcRH3 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF3126) followed by Allophycocyanin-conjugated Anti-Goat IgG Secondary Antibody (Catalog # F0108) and Mouse Anti-Human NKp46/NCR1 Phycoerythrin-conjugated Monoclonal Antibody (Catalog # FAB1850P). Quadrant markers were set based on control antibody staining (Catalog # AB-108-C).

• Reactivity: Hu
• Applications: Flow, CyTOF-ready
• Clonality: Polyclonal
• Host: Goat
• Conjugate: Unconjugated
• Concentration: LYOPH

FCRL3/FcRH3 Antibody Summary

• Immunogen: Mouse myeloma cell line NS0-derived recombinant human FCRL3/FcRH3
  Arg14-Arg569
  Accession # NP_443171
• Specificity: Detects human FCRL3/FcRH3 in direct ELISAs. In direct ELISAs, approximately 15% cross-reactivity with recombinant human (rh) IRTA2 and rhIRTA5 is observed.
• Source: N/A
• Isotype: IgG
• Clonality: Polyclonal
• Host: Goat
• Gene: FCRL3
• Purity: Immunogen affinity purified
• Purity Statement: Antigen Affinity-purified

Applications/Dilutions

• Dilutions:
  • CyTOF-ready
  • Flow Cytometry 2.5 ug/10^6 cells

Packaging, Storage & Formulations

• Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
• Buffer: Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.
• Preservative: No Preservative
• Concentration: LYOPH
• Purity: Immunogen affinity purified
• Reconstitution Instructions: Reconstitute at 0.2 mg/mL in sterile PBS.

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for FCRL3/FcRH3 Antibody

• CD307c
• Fc receptor homolog 3
• Fc receptor-like 3
• Fc receptor-like protein 3
• FcRH3
• FCRL3
• fcR-like protein 3
• hIFGP3
• IFGP3
• immunoglobulin superfamily receptor translocation associated protein 3
• IRTA3
• SPAP2

Background

FCRL3 (Fc Receptor-Like 3), also known as FcRH3, IRTA3, and SPAP2, is a 110 kDa molecule 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). Mature human FCRL3 consists of a 556 amino acid (aa) extracellular domain (ECD) with six Ig-like domains, a 21 aa transmembrane segment, and a 140 aa cytoplasmic domain with four immunotyrosine inhibitory motifs (ITIMs) (2 - 4). Within the ECD, human and mouse FCRL3 share 35% aa sequence identity. Alternate splicing generates several additional isoforms with deletions or substitutions in both the extracellular and intracellular regions. These include potentially secreted forms that are truncated following the second Ig-like domain (4). FCRL3 is expressed in secondary lymphoid organs on the surface of mature naïve and memory B cells, NK cells, and B cell lines derived from chronic lymphocytic leukemias (2, 3, 5). It is upregulated on B cells following LPS or anti-CD40 stimulation (6). A polymorphism in the FCRL3 promoter induces enhanced transcription and is associated with the development of autoimmune disorders in a Japanese population (6, 7). Tyrosine phosphorylation within the ITIMs of FCRL3 enables its association with SHP-1 (4).

1. Davis, R.S. (2007) Annu. Rev. Immunol. 25:525.
2. Miller, I. et al. (2002) Blood, 99:2662.
3. Davis, R.S. et al. (2001) Proc. Natl. Acad. Sci. 98:9772.
4. Xu, M.-J. et al. (2002) Biochem. Biophys. Res. Commun. 293:1037.
5. Polson, A.G. et al. (2006) Int. Immunol. 18:1363.
6. Kochi, Y. et al. (2005) Nat. Genet. 37:478.
7. Chistiakov, D.A. and A.P. Chistiakov (2007) Hum. Immunol. 68:375.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

Bioinformatics

• Gene Symbol: FCRL3
• Uniprot:
  • NP_443171()