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Mouse Monoclonal to CD170 / Siglec-5

1A5 (IgG1)

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CD170, also known as Siglec 5 (sialic acid binding Ig-like lectin 5) is a type 1 transmembrane glycoprotein containing two cytoplasmic immunoreceptor tyrosine inhibitory motifs (ITIMs). CD170 forms homodimers and functions as an inhibitory receptor able to downregulate cell activation. It binds to alpha2,3- and alpha2,6-linked sialic acid ligands, e.g. on glycophorin A (CD235a). Aberrant expression of CD170 by CD34+ progenitor cells can be observed in case of acute myeloid leukemias.


The mouse monoclonal antibody 1A5 recognizes CD170 (Siglec-5, sialic acid binding Ig-like lectin 5), a transmembrane glycoprotein expressed strongly by neutrophils, macrophages activated during infections, monocytes, and dendritic cells. As in case with other anti-CD170 antibodies, this antibody crossreacts with Siglec-14, whose first two Ig domains are almost identical to those of CD170.
HLDA VII; WS Code 70443

Regulatory Status


Fusion protein composed of human CD170 extracellular domain and Fc region of human IgG1

Species Reactivity:

  • Human
  • Non-Human Primates

Negative Species:


  • Flow Cytometry
  • Immunoprecipitation
  • Immunohistochemistry (frozen sections)
  • Immunocytochemistry
Usage note:
Indicated dilutions are recommended starting points for use of this product. Working concentrations should be determined by the investigator.

Product Specific References

  • *Avril T, Freeman SD, Attrill H, Clarke RG, Crocker PR: Siglec-5 (CD170) can mediate inhibitory signaling in the absence of immunoreceptor tyrosine-based inhibitory motif phosphorylation. J Biol Chem. 2005 May 20;280(20):19843-51. [Abstract] [Full Text]
  • *Yokoi H, Myers A, Matsumoto K, Crocker PR, Saito H, Bochner BS: Alteration and acquisition of Siglecs during in vitro maturation of CD34+ progenitors into human mast cells. Allergy. 2006 Jun;61(6):769-76. [Abstract]
  • *Angata T, Hayakawa T, Yamanaka M, Varki A, Nakamura M: Discovery of Siglec-14, a novel sialic acid receptor undergoing concerted evolution with Siglec-5 in primates. FASEB J. 2006 Oct;20(12):1964-73. [Abstract] [Full Text]
  • *Schuster P, Donhauser N, Pritschet K, Ries M, Haupt S, Kittan NA, Korn K, Schmidt B: Co-ordinated regulation of plasmacytoid dendritic cell surface receptors upon stimulation with herpes simplex virus type 1. Immunology. 2010 Feb;129(2):234-47. [Abstract]
  • For research use only. Not for drug, diagnostic or other use.

    Example Data

    1A5 purified FC

    Fig. 1. Surface staining of human peripheral blood cells using anti-CD170 (1A5) purified, GAM-APC.

    1A5 PE

    Fig. 2. Surface staining of human peripheral blood cells using anti-CD170 (1A5) PE.

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