Siglec-9 Antibody (191240) [Unconjugated]


Human peripheral blood granulocytes werestained with (A) Mouse Anti-Human Siglec-3/CD33 PE-conjugated Monoclonal Antibody(Catalog # FAB1137P) and (B) MouseAnti-HumanSiglec‑9 Monoclonal Antibody (Catalog # MAB1139, more
Recombinant Human Siglec‑9 Fc Chimera (Catalog # 1139-SL), immobilized onto a microplate, supports the adhesion of human red blood cells in a dose-dependent manner (orange line). Adhesion elicited by Recombinant Human more

Product Details

Reactivity HuSpecies Glossary
Applications WB, Flow, B/N, CyTOF-ready, ELISA(Cap)

Order Details

Siglec-9 Antibody (191240) [Unconjugated] Summary

Additional Information
Clone 191240 was used by HLDA to establish CD designation
Mouse myeloma cell line NS0-derived recombinant human Siglec-9
Gln18-Gly348 (predicted)
Accession # Q9Y336
Detects human Siglec-9 in direct ELISAs and Western blots. In direct ELISAs, less than 10% cross-reactivity with recombinant mouse
Siglec‑E is observed and less than 1% cross-reactivity with recombinant human (rh) Siglec-3, rhSiglec-5, rhSiglec-6, rhSiglec-7, rhSiglec-8 or rhSiglec-10 is observed. In Western blots, approximately 100% cross-reactivity with recombinant mouse Siglec‑E is observed under
non-reduced conditions.
Purity Statement
Protein A or G purified from hybridoma culture supernatant
Endotoxin Note
<1.0 EU per 1 μg of the antibody by the LAL method.
Innovator's Reward
Test in a species/application not listed above to receive a full credit towards a future purchase.


  • CyTOF-ready
  • ELISA Capture (Matched Antibody Pair) 2-8 ug/mL
  • ELISA Detection (Matched Antibody Pair) 0.1-0.4 ug/mL
  • ELISA Standard (Matched Pair)
  • Flow Cytometry 0.25 ug/10^6 cells
  • Neutralization 0.015-0.075 ug/mL
  • Western Blot 1 ug/mL
Application Notes
ELISA Capture: Human Siglec-9 Antibody (Catalog # MAB1139)
ELISA Detection: Human Siglec-9 Biotinylated Antibody (Catalog # BAF1139)
Standard: Recombinant Human Siglec-9 Fc Chimera (Catalog # 1139-SL)
Read Publications using
MAB1139 in the following applications:

Packaging, Storage & Formulations

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.
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.
No Preservative
Reconstitution Instructions
Reconstitute at 0.5 mg/mL in sterile PBS.


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

Alternate Names for Siglec-9 Antibody (191240) [Unconjugated]

  • CD329
  • CDw329
  • FOAP-9
  • OBBP-Like
  • Protein FOAP-9
  • sialic acid binding Ig-like lectin 9
  • sialic acid-binding Ig-like lectin 9
  • Siglec9
  • Siglec-9


Siglecs(1) (sialic acid binding Ig-like lectins) are I-type (Ig-type) lectins belonging to the Ig superfamily. They are characterized by an N-terminal Ig-like V-type domain which mediates sialic acid binding, followed by varying numbers of Ig-like C2-type domains (1, 2). Eleven human Siglecs have been cloned and characterized. They are sialoadhesin/CD169/Siglec-1, CD22/Siglec-2, CD33/Siglec-3, Myelin-Associated Glycoprotein (MAG/Siglec-4a) and Siglec-5 to -11 (1‑4). To date, no Siglec has been shown to recognized any cell surface ligand other than sialic acids, suggesting that interactions with glycans containing this carbohydrate are important in mediating the biological functions of Siglecs. Siglecs 5 to 11 share a high degree of sequence similarity with CD33/Siglec-3 both in their extracellular and intracellular regions. They are collectively referred to as CD33-related Siglecs. One remarkable feature of the CD33-related Siglecs is their differential expression pattern within the hematopoietic system (2, 3). This fact, together with the presence of two conserved immunoreceptor tyrosine-based inhibition motifs (ITIMs) in their cytoplasmic tails, suggests that CD33-related Siglecs are involved in the regulation of cellular activation within the immune system.

The cDNA of human Siglec-9 encodes a 463 amino acid (aa) polypeptide with a hydrophobic signal peptide, an N-terminal Ig-likeV-type domain, two Ig-like C2-type domains, a transmembrane region and a cytoplasmic tail (5, 6). In peripheral blood leukocytes, Siglec-9 is expressed on neutrophils, monocytes, a fraction of NK cells, B cells, and a minor subset of CD8+ T cells (5). It binds equally well to both 2,3- and 2,6-linked sialic acid (5, 6). Siglec-9 is closely related to Siglec-7, and they share ~80% amino acid sequence identity. The gene encoding siglec-9 was mapped to chromosome 19q13.4.

  1. Crocker, P.R. et al. (1998) Glycobiology 8:v.
  2. Crocker, P.R. and A. Varki (2001) Trends Immunol. 22:337.
  3. Crocker, P.R. and A. Varki (2001) Immunology 103:137.
  4. Angata, T. et al. (2002) J. Biol. Chem. 277:24466.
  5. Zhang, J.Q. et al. (2000) J. Biol. Chem. 275:22121.
  6. Angata, T. et al. (2000) J. Biol. Chem. 275:22127.


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.

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Publications for Siglec-9 Antibody (MAB1139)(6)

We have publications tested in 1 confirmed species: Human.

We have publications tested in 2 applications: Flow Cytometry, Neutralization.

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Showing Publications 1 - 6 of 6.
Publications using MAB1139 Applications Species
F Bai, Z Chen, S Xu, L Han, X Zeng, S Huang, Z Zhu, L Zhou Wogonin attenuates neutrophilic inflammation and airway smooth muscle proliferation through inducing caspase-dependent apoptosis and inhibiting MAPK/Akt signaling in allergic airways International immunopharmacology, 2022-11-11;113(0):109410. 2022-11-11 [PMID: 36371864] (Neutralization, Human) Neutralization Human
M Vijayan, CL Lee, VHH Wong, X Wang, K Bai, J Wu, H Koistinen, M Seppälä, KF Lee, WSB Yeung, EHY Ng, PCN Chiu Decidual glycodelin-A polarizes human monocytes towards a decidual macrophage-like phenotype via siglec-7 J. Cell. Sci., 2020-07-23;0(0):. 2020-07-23 [PMID: 32513821] (Neutralization, Human) Neutralization Human
Q Haas, K Frias Boli, C Jandus, C Schneider, C Simillion, MA Stanczak, M Haubitz, SM Seyed Jafa, A Zippelius, GM Baerlocher, H Läubli, RE Hunger, P Romero, HU Simon, S von Gunten Siglec-9 regulates an effector memory CD8+ T-cell subset that congregates in the melanoma tumor microenvironment Cancer Immunol Res, 2019-04-15;0(0):. 2019-04-15 [PMID: 30988027] (Flow Cytometry, Human) Flow Cytometry Human
MA Stanczak, SS Siddiqui, MP Trefny, DS Thommen, KF Boligan, S von Gunten, A Tzankov, L Tietze, D Lardinois, V Heinzelman, MS von Bergwe, W Zhang, HJ Lenz, Y Han, CI Amos, M Syedbasha, A Egli, F Stenner, DE Speiser, A Varki, A Zippelius, H Läubli Self-associated molecular patterns mediate cancer immune evasion by engaging Siglecs on T cells J. Clin. Invest., 2018-09-24;0(0):. 2018-09-24 [PMID: 30130255] (Neutralization, Human) Neutralization Human
Beziat V, Descours B, Parizot C, Debre P, Vieillard V NK cell terminal differentiation: correlated stepwise decrease of NKG2A and acquisition of KIRs. PLoS ONE, 2010-08-06;5(8):e11966. 2010-08-06 [PMID: 20700504] (Flow Cytometry, Human) Flow Cytometry Human
Carlin AF, Uchiyama S, Chang YC, Lewis AL, Nizet V, Varki A Molecular mimicry of host sialylated glycans allows a bacterial pathogen to engage neutrophil Siglec-9 and dampen the innate immune response. Blood, 2009-02-04;113(14):3333-6. 2009-02-04 [PMID: 19196661] (Neutralization, Human) Neutralization Human

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Gene Symbol SIGLEC9