NKG2A/CD159a/KLRC1 Antibody (131411R) [FITC]

NKG2A/CD159a/KLRC1 Antibody (131411R) [FITC] [FAB1059RF] - Vial of FITC conjugated antibody. FITC is optimally excited at 498 nm by the Blue laser (488 nm) and has an emission maximum of 519 nm.

• Applications: Flow, CyTOF-ready
• Clone: 131411R
• Clonality: Monoclonal
• Host: Mouse
• Conjugate: FITC

NKG2A/CD159a/KLRC1 Antibody (131411R) [FITC] Summary

• Description: This conjugate is made on demand and is not held in inventory. Each order represents a unique lot. All conjugates are generated using validated conjugation protocols and meet strict degree of labeling (F/P) specifications; additional information is available upon request. The antibody concentration is provided on the individual product label.
  
  For specialized conjugation needs, like large quantities, specific concentrations, and defined F/P ratios, bulk and custom antibody conjugation services are available.
• Additional Information: Recombinant Monoclonal Antibody
• Immunogen: BaF3 mouse pro-B cell line transfected with human NKG2A and CD94
• Specificity: Recognizes the human NKG2A/CD94 heterodimer. It does not recognize the NKG2C/CD94 heterodimer or the CD94 homodimer.
• Isotype: IgG2a
• Clonality: Monoclonal
• Host: Mouse
• Purity: Protein A or G purified from cell culture supernatant

Applications/Dilutions

• Dilutions:
  • CyTOF-ready
  • Flow Cytometry
• Application Notes: Recommended applications are based on validated applications from the unconjugated base product FAB1059R. This conjugated antibody is not kept in inventory and is made to order using validated conjugation protocols.

Packaging, Storage & Formulations

• Storage: Store at 4C in the dark.
• Buffer: PBS
• Preservative: 0.05% Sodium Azide
• Purity: Protein A or G purified from cell culture supernatant

Alternate Names for NKG2A/CD159a/KLRC1 Antibody (131411R) [FITC]

• CD159 antigen-like family member A
• CD159a antigen
• CD159a
• C-lectin type II protein
• killer cell lectin-like receptor subfamily C, member 1
• Klrc1
• MGC13374
• natural killer cell lectin
• natural killer group protein 2
• NK cell receptor A
• NKG2
• NKG2-1/B activating NK receptor
• NKG2A
• NKG2-A
• NKG2-A/B type II integral membrane protein
• NKG2-A/B-activating NK receptor
• NKG2-A/NKG2-B type II integral membrane protein
• NKG2AMGC59791
• NKG2-B

Background

NK group 2 member A (NKG2A), also known as killer lectin like receptor c1 (KLRC1) and CD159a, is a ~38 kDa type II transmembrane protein belonging to the C-type lectin superfamily and plays a role in suppression of cytotoxic CD8+ T cell activity and functions as an immune checkpoint (1,2). NKG2A belongs to a group of natural killer (NK) cell inhibitor receptors (IRs) which includes killer immunoglobulin receptors (KIRs), lymphocyte activation gene-3 (LAG-3), T cell immunoreceptor with Ig and ITIM domains (TIGIT), programmed death ligand-1 (PD-1), and T cell immunoglobulin mucin-3 (TIM-3) (1,3). NKG2A is synthesized as a protein of 233 amino acids (aa) with a theoretical molecular weight of 26.3 kDa and is expressed on CD56hi NK cells, NKT cells, and some CD8+ alphabeta T cells (2,4). Together with CD94, NKG2A forms a heterodimer and acts as a receptor for the MHC Class I molecular human leukocyte antigen (HLA)-E (1-3). The NKG2A/CD94 receptor interaction with the HLA-E ligand results in phosphorylation of NKG2A's immunoreceptor tyrosine-based inhibition motifs (ITIMs), causing suppression of activating signals from immunoreceptor tyrosine-based activation motif (ITAM)- containing T cell receptors (TCR) or other activating receptors like NKG2D, via the intracellular phosphatase SHP1 (2,3,5). Overall, cancer cells utilize the NKG2A-HLA-E interaction and signaling to evade immune surveillance by NK cells and T cells (1-3,5-6).

Similar to cytotoxic T lymphocyte associated protein 4 (CTLA-4) and PD-1, NKG2A has become a prominent target for immune checkpoint blockade and cancer immunotherapy (1-3,5-6). Monalizumab is a novel IgG4 monoclonal antibody developed for blocking NKG2A's interaction with HLA-E and has shown promising results in clinical trials (1-3,5-6). In addition to being used as a single agent, it is being studied as a possible combination therapy with other blocking antibodies such as anti-PD-L1 and anti-epidermal growth factor receptor (EGFR) (2,5,6).

References

1. Alfarra, H., Weir, J., Grieve, S., & Reiman, T. (2020). Targeting NK Cell Inhibitory Receptors for Precision Multiple Myeloma Immunotherapy. Frontiers in immunology, 11, 575609. https://doi.org/10.3389/fimmu.2020.575609

2. Creelan, B. C., & Antonia, S. J. (2019). The NKG2A immune checkpoint - a new direction in cancer immunotherapy. Nature reviews. Clinical oncology, 16(5), 277-278. https://doi.org/10.1038/s41571-019-0182-8

3. Zaghi, E., Calvi, M., Marcenaro, E., Mavilio, D., & Di Vito, C. (2019). Targeting NKG2A to elucidate natural killer cell ontogenesis and to develop novel immune-therapeutic strategies in cancer therapy. Journal of leukocyte biology, 105(6), 1243-1251. https://doi.org/10.1002/JLB.MR0718-300R

4. Uniprot (P26715)

5. Borst, L., van der Burg, S. H., & van Hall, T. (2020). The NKG2A-HLA-E Axis as a Novel Checkpoint in the Tumor Microenvironment. Clinical cancer research : an official journal of the American Association for Cancer Research, 26(21), 5549-5556. https://doi.org/10.1158/1078-0432.CCR-19-2095

6. Andre, P., Denis, C., Soulas, C., Bourbon-Caillet, C., Lopez, J., Arnoux, T., Blery, M., Bonnafous, C., Gauthier, L., Morel, A., Rossi, B., Remark, R., Breso, V., Bonnet, E., Habif, G., Guia, S., Lalanne, A. I., Hoffmann, C., Lantz, O., Fayette, J., ... Vivier, E. (2018). Anti-NKG2A mAb Is a Checkpoint Inhibitor that Promotes Anti-tumor Immunity by Unleashing Both T and NK Cells. Cell, 175(7), 1731-1743.e13. https://doi.org/10.1016/j.cell.2018.10.014

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.