LAG3 Antibody

Code CSB-PA012719LA01HU
Size US$166
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  • Western Blot
    Positive WB detected in: HepG2 whole cell lysate
    All lanes: LAG3 antibody at 4.9µg/ml
    Goat polyclonal to rabbit IgG at 1/50000 dilution
    Predicted band size: 58, 40 kDa
    Observed band size: 58 kDa
  • Immunofluorescence staining of HepG2 cells with CSB-PA012719LA01HU at 1:66, counter-stained with DAPI. The cells were fixed in 4% formaldehyde, permeabilized using 0.2% Triton X-100 and blocked in 10% normal Goat Serum. The cells were then incubated with the antibody overnight at 4°C. The secondary antibody was Alexa Fluor 488-congugated AffiniPure Goat Anti-Rabbit IgG(H+L).
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Product Details

Full Product Name
Rabbit anti-Homo sapiens (Human) LAG3 Polyclonal antibody
Uniprot No.
Target Names
Alternative Names
CD223 antibody; CD223 antigen antibody; FDC protein antibody; LAG-3 antibody; Lag3 antibody; LAG3_HUMAN antibody; Lymphocyte activating 3 antibody; Lymphocyte activation gene 3 antibody; Lymphocyte activation gene 3 protein antibody; Protein FDC antibody
Raised in
Species Reactivity
Recombinant Human Lymphocyte activation gene 3 protein (29-450AA)
Immunogen Species
Homo sapiens (Human)

The LAG3 Antibody (Product code: CSB-PA012719LA01HU) is Non-conjugated. For LAG3 Antibody with conjugates, please check the following table.

Available Conjugates
Conjugate Product Code Product Name Application
HRP CSB-PA012719LB01HU LAG3 Antibody, HRP conjugated ELISA
FITC CSB-PA012719LC01HU LAG3 Antibody, FITC conjugated
Biotin CSB-PA012719LD01HU LAG3 Antibody, Biotin conjugated ELISA
Purification Method
>95%, Protein G purified
It differs from different batches. Please contact us to confirm it.
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, PH 7.4
Tested Applications
Recommended Dilution
Application Recommended Dilution
WB 1:500-1:5000
IF 1:50-1:200
Troubleshooting and FAQs
Upon receipt, store at -20°C or -80°C. Avoid repeated freeze.
Lead Time
Basically, we can dispatch the products out in 1-3 working days after receiving your orders. Delivery time maybe differs from different purchasing way or location, please kindly consult your local distributors for specific delivery time.
LAG3 polyclonal antibody CSB-PA012719LA01HU was produced in the rabbit immunized by using the Recombinant Human Lymphocyte activation gene 3 protein (29-450AA) as the immunogen. The target protein LAG3 belongs to Ig superfamily and contains 4 extracellular Ig-like domains. It is inhibitory receptor on antigen activated T-cells and delivers inhibitory signals upon binding to ligands, such as FGL1 (By similarity). Diseases associated with LAG3 include Smoldering Myeloma and Kyphoscoliotic Heart Disease.
This Rabbit anti-Homo sapiens (Human) LAG3 Polyclonal antibody was tested in the ELISA, WB, IHC and IF applications. The non-conjugated IgG got purified by protein G and reached up to 95% in purity. It only reacts with the LAG3 proteins of human-origin and may be used to detect the endogenous levels of LAG3 protein.

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Target Background

Lymphocyte activation gene 3 protein: Inhibitory receptor on antigen activated T-cells. Delivers inhibitory signals upon binding to ligands, such as FGL1. FGL1 constitutes a major ligand of LAG3 and is responsible for LAG3 T-cell inhibitory function. Following TCR engagement, LAG3 associates with CD3-TCR in the immunological synapse and directly inhibits T-cell activation. May inhibit antigen-specific T-cell activation in synergy with PDCD1/PD-1, possibly by acting as a coreceptor for PDCD1/PD-1. Negatively regulates the proliferation, activation, effector function and homeostasis of both CD8(+) and CD4(+) T-cells. Also mediates immune tolerance: constitutively expressed on a subset of regulatory T-cells (Tregs) and contributes to their suppressive function. Also acts as a negative regulator of plasmacytoid dendritic cell (pDCs) activation. Binds MHC class II (MHC-II); the precise role of MHC-II-binding is however unclear.; May function as a ligand for MHC class II (MHC-II) on antigen-presenting cells (APC), promoting APC activation/maturation and driving Th1 immune response.
Gene References into Functions
  1. Results demonstrated that the expression of LAG3 in colorectal carcinoma tissue was significantly increased compared with the paracancerous tissue. It was mainly expressed at the edge of tumor tissues suggesting that LAG3 was expressed on tumorinfiltrating lymph node cells but not in colorectal cancer cells. PMID: 30272332
  2. These results together suggested that LAG-3 is a marker of CD4(+) T cells with regulatory function; at the same time, LAG-3 might have limited the full suppressive potential of Treg cells. PMID: 29671649
  3. Among the 89 patients, CD274, LAG3, and IDO1 expressions in TIICs were observed in 68.6% (61 cases), 13.5% (12), and 28.1% (25) of patients, respectively. CD274, CTLA4, and IDO1 were expressed in tumor cells of 24.7% (22 cases), 4.5% (4), and 72.0% (64) of patients, respectively. PMID: 29520442
  4. LAG-3+ iTILs are enriched in estrogen receptor-negative breast cancers and represent an independent favorable prognostic factor. In addition, a high proportion of PD-1/PD-L1+ tumors are co-infiltrated with LAG-3+ TILs. PMID: 29045526
  5. Squamous cell carcinomas escape immune surveillance via inducing chronic activation and exhaustion of CD8+ T Cells co-expressing PD-1 and LAG-3 inhibitory receptors. PMID: 27835902
  6. Data suggest that blocking LAG3-MHC class II interactions is a potential therapeutic target in chronic lymphocytic leukemia. PMID: 28154084
  7. LAG-3 expression was correlated with expression of PD-1 on TILs and expression of PD-L1 on tumor cells. Higher expression of LAG-3 on TILs was significantly correlated with higher expression of PD-1 on TILs and higher expression of PD-L1 on tumor cells. PMID: 28132868
  8. the upregulation of others syncytial molecules, including LAG3, CTLA4, CD28 and CD3, assisting the formation of syncytia with APC cells. PMID: 27108398
  9. LAG3-expressing CD4(+)CD25(-) T cells represent another regulatory immune cell type with potential to interfere with anti-tumor immunity. PMID: 28935468
  10. Overexpression of lymphocyte activation gene-3 inhibits regulatory T cell responses in osteoarthritis PMID: 28800255
  11. Egr2-driven cell surface proteins LAG-3 and 4-1BB can identify dysfunctional tumor antigen-specific CD8(+) TIL. PMID: 28115575
  12. our data indicate that the evaluation of stromal TILs remains the most reliable immune prognostic marker in TNBC, and support the clinical evaluation of anti-PD-1/PD-L1 and anti-LAG-3 in a subset of patients with TNBC who have concurrent expression of both checkpoint receptors. PMID: 27912781
  13. this review provides the translational rationale for targeting LAG3, as well as historical and current state of clinical trials utilizing LAG3 cancer immunomodulators PMID: 28258692
  14. this study shows that LAG3 expressed on myeloid leukaemia cells possess the capacity to facilitate functional exhaustion in T helper cells PMID: 27565576
  15. epigenetic modification on LAG-3 increased LAG-3(+) T cells and its immune regulatory roles in chronic osteomyelitis progression PMID: 28028751
  16. Immune checkpoint proteins are co-inhibitory factors that can diminish the antigen-specific immune responses by attenuating the regulatory role of cytotoxic T-lymphocyte-associated protein 4, programmed cell death-1, lymphocyte-activation gene 3, and T-cell immunoglobulin mucin-3. PMID: 28349816
  17. LAG3 binds alpha-synuclein preformed fibrils (PFF) with high affinity (dissociation constant = 77 nanomolar), whereas the alpha-syn monomer exhibited minimal binding. alpha-Syn-biotin PFF binding to LAG3 initiated alpha-syn PFF endocytosis, transmission, and toxicity. PMID: 27708076
  18. An IL-27/Lag3 axis enhances Foxp3+ regulatory T cell-suppressive function and therapeutic efficacy. PMID: 26013006
  19. LAG-3 is highly expressed in peripheral blood CD8+ T cells in chronic HBV-infected patients. PMID: 27053622
  20. iNKT cytokine production is profoundly altered by both HIV infection and treatment, and LAG-3, but not PD-1, expression is associated with a reduction in iNKT IFNgamma production. PMID: 25810006
  21. NFKB1, CD27, LAG3 and IKZF3 are new susceptibility genes for psoriasis. PMID: 25006012
  22. The elevated expression of LAG-3 at the genital tract suggests it may regulate T-cell activation, and identify cells susceptible to HIV infection. The enrichment of LAG-3 on double negative T cells suggests LAG-3 may contribute to the immunoregulatory activity of these cells. PMID: 25154740
  23. the LAG-3/MHC class II pathway may synergize with PD-1/PD ligand to enhance T cell-mediated immune responses. PMID: 25780040
  24. LAG-3 trafficking from lysosomal compartments to the cell surface is dependent on the cytoplasmic domain through protein kinase C signaling in activated T cells. PMID: 25108024
  25. These results suggest that LAG-3-mediated activation of plasmacytoid dendritic cells takes place in vivo at tumor sites, and it is in part responsible for directing an immune-suppressive environment. PMID: 24441096
  26. Expression of LAG-3 is coincident with the impaired effector function of HBV-specific CD8(+) T cell in HCC patients. PMID: 23261718
  27. our data suggest that the LAG-3-MHC II interaction could be viewed as a bidirectional immune escape pathway in melanoma PMID: 21441454
  28. Multiple myeloma was associated with 2 SNPs in intron regions of LAG3 within 20 k base pairs 5' upstream of the candidate CD4 gene. The variant in LAG3 gene itself may play a role in susceptibility of MM. PMID: 20568250
  29. Analysis identified a gene-set (LAG3, LPL, ZAP70) whose overexpression is assigned to unmutated immunoglobulin variable heavy chain region with 90% specificity. PMID: 20228263
  30. LAG-3 defines an active CD4(+)CD25(high)Foxp3(+) regulatory T cell subset whose frequency is enhanced in the PBMCs of patients with cancer PMID: 20421648
  31. Tumor-infiltrating NY-ESO-1-specific CD8+ T cells are negatively regulated by LAG-3 and PD-1 in human ovarian cancer. PMID: 20385810
  32. MHC class II-mediated signals induced by the natural ligand, LAG-3, lead to complete maturation of monocyte-derived dendritic cells, which acquire the capacity to trigger naive T cells and drive polarized Th1 responses. PMID: 11937541
  33. LAG-3 induces rapid protein phosphorylation of phospholipase Cgamma2 and p72syk as well as activation of phosphatidyl inositol 3-kinase/Akt, p42/44 extracellular signal-regulated protein kinase, and p38 mitogen-activated protein kinase pathways. PMID: 12775570
  34. LAG3 may mediate sphingolipid metabolism PMID: 12825348
  35. LAG-3 activates antigen-presenting cells through MHC class II signalling, leading to increased antigen-specific T-cell responses in vivo. PMID: 14644131
  36. regulatory T cells and LAG-3 have pivotal roles in the suppression of EBV-specific cell-mediated immunity in Hodgkin lymphoma PMID: 16757686
  37. The result, including a total of 2640 MS patients and 2194 controls shows no significant association with CD4 and LAG3 and MS. We conclude that these genes are of minor importance in regard of genetic predisposition to the MS. PMID: 17020785
  38. Soluble human recombinant fusion protein (hLAG-3Ig) used in vitro as a single maturation agent induces phenotypic maturation of monocyte-derived dendritic cells and promotes the production of chemokines and TNF-alpha inflammatory cytokine. PMID: 18322184

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Subcellular Location
[Lymphocyte activation gene 3 protein]: Cell membrane; Single-pass type I membrane protein.; [Secreted lymphocyte activation gene 3 protein]: Secreted.
Tissue Specificity
Primarily expressed in activated T-cells and a subset of natural killer (NK) cells.
Database Links

HGNC: 6476

OMIM: 153337

KEGG: hsa:3902

STRING: 9606.ENSP00000203629

UniGene: Hs.409523

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