• Species Reactivity

  Human

• Specificity

  Detects human CD300f/LMIR3 in direct ELISAs. In direct ELISAs, no cross-reactivity with recombinant human LMIR1, 2, 4, 5, 6, or recombinant mouse LMIR3 is observed.

• Source

  Monoclonal Rat IgG2b Clone # 234903

• Immunogen

  Y3 rat myeloid cell line transfected with human CD300f/LMIR3

• Formulation

  Supplied 0.2 mg/mL in a saline solution containing BSA and Sodium Azide.

• Label

  Alexa Fluor 700

Applications

• Recommended    
  Concentration

  Sample

• Flow Cytometry

  0.25-1 µg/10    ⁶ cells

  Human whole blood monocytes

• 
  

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

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: CD300f/LMIR3

CD300f, also known as CD300LF, LMIR3, IREM-1, CLM-1, IgSF13, DIgR1, and MAIR-V, is a 50‑60 kDa glycoprotein member of the immunoglobulin superfamily (1). Human CD300f consists of a 137 amino acid (aa) extracellular domain (ECD) with one Ig-like V-type domain, a 21 aa transmembrane segment, and a 113 aa cytoplasmic domain that contains multiple immunoreceptor tyrosine-based inhibitory motifs (ITIMs) or ITIM-like sequences (2, 3). Alternate splicing generates additional isoforms that carry substituted C-terminal tails of varying lengths and sequences following the ECD or transmembrane segment (3). Within the ECD, human CD300f shares 43% aa sequence identity with mouse and rat CD300f. CD300f is expressed on the surface of dendritic cells, monocytes, granulocytes, and mast cells as well as on acute myeloid leukemia (AML) blasts (2‑4). Pervanadate treatment or antibody crosslinking of CD300f induces phosphorylation of tyrosine residues in the cytoplasmic domain and the subsequent recruitment of phosphatases SHIP, SHP-1, SHP-2, and the p85 alpha subunit of PI3K (2, 3, 5, 6). CD300f ligation can induce cell death and inhibit signaling through multiple receptors including Fc epsilon RI, LMIR4, SCF R, TLR2, TLR3, and TLR9 (3‑8). In contrast, it enhances TLR4-mediated signaling/cytokine production in mast cells through association with the activating signaling protein FcR gamma (5). In mouse, a splice variant of CD300f (known as DIgR2, with a 7 aa insertion in the ECD) inhibits CD4+ T cell activation and   in vivo Th1 and CTL responses (9). CD300f is upregulated on monocytes surrounding experimentally-induced spinal cord demyelination and functions as a negative regulator of inflammation in the CNS (10).

• References:

1. Clark, G.J. et al. (2009) Trends Immunol. 30:209.

2. Sui, L. et al. (2004) Biochem. Biophys. Res. Commun. 319:920.

3. Alvarez-Errico, D. et al. (2004) Eur. J. Immunol. 34:3690.

4. Korver, W. et al. (2009) Leukemia 23:1587.

5. Izawa, K. et al. (2009) J. Immunol. 183:925.

6. Alvarez-Errico, D. et al. (2007) J. Immunol. 178:808.

7. Can, I. et al. (2008) J. Immunol. 180:207.

8. Izawa, K. et al. (2007) J. Biol. Chem. 282:17997.

9. Shi, L. et al. (2006) Blood 108:2678.

10. Xi, H. et al. (2010) J. Exp. Med. 207:7.

• Long Name:

  Leukocyte Mono Ig-like Receptor 3

• Entrez Gene IDs:

  146722 (Human); 246746 (Mouse)

• Alternate Names:

  CMRF35-like molecule 1; CD300 molecule-like family member f; CD300f; CD300LF; CLIM1; CLM1; CLM-1; DIgR2; IGSF13; IREM1; IREM-1; LMIR3; NKIR; Pigr3