Human LAG-3 Fluorescein-conjugated Antibody

Catalog # Availability Size / Price Qty
FAB2319F
Detection of LAG-3 in Human PBMCs by Flow Cytometry.
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Product Details
Citations (2)
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Human LAG-3 Fluorescein-conjugated Antibody Summary

Species Reactivity
Human
Specificity
Detects human LAG-3 in direct ELISAs and Western blots. In direct ELISAs and Western blots, less than 1% cross-reactivity with recombinant mouse LAG-3 is observed.
Source
Polyclonal Goat IgG
Purification
Antigen Affinity-purified
Immunogen
Mouse myeloma cell line NS0-derived recombinant human LAG-3
Leu23-Leu450
Accession # P18627
Formulation
Supplied in a saline solution containing BSA and Sodium Azide.
Label
Fluorescein (Excitation= 488 nm, Emission= 515-545 nm)

Applications

Recommended Concentration
Sample
Flow Cytometry
10 µL/106 cells
See below

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

Scientific Data

Flow Cytometry Detection of LAG-3 antibody in Human PBMCs antibody by Flow Cytometry. View Larger

Detection of LAG-3 in Human PBMCs by Flow Cytometry. Human peripheral blood mononuclear cells (PBMCs) treated with 1 μg/mL PHA for 5 days were stained with Mouse Anti-Human CD3 epsilon APC-conjugated Monoclonal Antibody (Catalog # FAB100A) and either (A) Goat Anti-Human LAG-3 Fluorescein-conjugated Antigen Affinity-purified Polyclonal Antibody (Catalog # FAB2319F) or (B) Normal Goat IgG Fluorescein Control (Catalog # IC108F). View our protocol for Staining Membrane-associated Proteins.

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Preparation and Storage

Shipping
The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage
Protect from light. Do not freeze.
  • 12 months from date of receipt, 2 to 8 °C as supplied.

Background: LAG-3

LAG-3 (Lymphocyte activation gene-3), also known as CD223, is a member of the immunoglobulin superfamily (IgSF). The mature LAG-3 protein is a 496 amino acid (aa) membrane protein with a 421 aa extracellular region which contains four IgSF domains, a 21 aa transmembrane region and a 54 aa cytoplasmic region. LAG-3 and CD4 molecules share < 20% aa sequence homology but have a similar structure (1, 2). Both molecules bind to MHC class II. LAG-3 binds to MHC class II with higher affinity compared to CD4. Both LAG-3 and CD4 genes are located on the distal part of the short arm of chromosome 12.

LAG-3 is an activation-induced molecule, expressed on activated T cells and NK cells, but not on resting T cells. Studies using LAG-3 -/- mice have shown significant delay of T cell apoptosis following antigen stimulation and increased size of memory T cells pool following infection (3, 4). It also has been reported that anti-LAG-3 antibodies up-regulate T cell activation by blocking interaction of LAG-3 and MHC class II. The study has demonstrated that LAG-3 is selectively expressed on activated CD4+CD25+ TReg cells and plays a role in their suppressive activity (5). This evidence indicated, unlike the interaction of CD4 with MHC class II that plays a positive role in T cell activation, LAG-3 binds to MHC class II and negatively regulates T cell activation through LAG-3 signaling. On the other hand, studies have shown that binding of LAG-3 to MHC class II molecules on antigen presenting cells induce maturation of dendritic cells and cytokine secretion by monocytes through MHC class II signal transduction (6). Taken together, LAG-3 may have two major functions, it negatively regulates T cells activation through LAG-3 signaling and stimulates antigen presenting cells which express MHC class II.

References
  1. Triebel, F. et al. (1990) J. Exp. Med. 171:1393.
  2. Baixeras, E. et al. (1992) J. Exp. Med 176:327.
  3. Workman, C.J. and D.A. Vignali (2003) Eur. J. Immunol. 33:970.
  4. Workman, C.J. et al. (2004) J. Immunol. 172:5450.
  5. Huang, C.T. et al. (2004) Immunity 21:503.
  6. Andreae, S. et al. (2003) Blood 102:2130.
Long Name
Lymphocyte-activation Gene 3
Entrez Gene IDs
3902 (Human); 16768 (Mouse); 297596 (Rat); 102122272 (Cynomolgus Monkey)
Alternate Names
CD223 antigen; CD223; LAG3; LAG-3; lymphocyte activating 3; lymphocyte activation gene 3 protein; lymphocyte-activation gene 3; Secreted lymphocyte activation gene 3 protein; sLAG-3

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Citations for Human LAG-3 Fluorescein-conjugated Antibody

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

2 Citations: Showing 1 - 2
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  1. Increased homeostatic cytokines and stability of HIV-infected memory CD4 T-cells identify individuals with suboptimal CD4 T-cell recovery on-ART
    Authors: M Pino, S Pereira Ri, A Pagliuzza, K Ghneim, A Khan, E Ryan, JL Harper, CT King, S Welbourn, L Micci, S Aldrete, KA Delman, T Stuart, M Lowe, JM Brenchley, CA Derdeyn, K Easley, RP Sekaly, N Chomont, M Paiardini, VC Marconi
    PloS Pathogens, 2021;17(8):e1009825.
    Species: Human
    Sample Types: Whole Cells
    Applications: Flow Cytometry
  2. Antitumor Activity Associated with Prolonged Persistence of Adoptively Transferred NY-ESO-1c259T cells in Synovial Sarcoma
    Authors: SP D'Angelo, L Melchiori, MS Merchant, DB Bernstein, J Glod, RN Kaplan, SA Grupp, WD Tap, K Chagin, GK Binder, S Basu, DE Lowther, R Wang, N Bath, A Tipping, G Betts, I Ramachandr, JM Navenot, H Zhang, DK Wells, E Van Winkle, G Kari, T Trivedi, T Holdich, LN Pandite, R Amado, CL Mackall
    Cancer Discov, 2018;0(0):.
    Species: Human
    Sample Types: Whole Cells
    Applications: Flow Cytometry

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