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The lymphocyte activation gene-3 (LAG-3, CD223), a member of the immunoglobulin superfamily (IgSF) related to CD4, binds to the major histocompatibility complex (MHC) class II molecules but with higher affinity than CD4. Several alternative mRNA splice-variants of human LAG-3 have been described, two of them encoding potential secreted forms: LAG-3V1 (i.e. the D1-D2 domains of the protein, 36 kDa) and LAG-3V3 (D1-D3, 52 kDa). The longer form was detected by ELISA in the serum of healthy individuals as well as of tuberculosis patients with a favorable outcome. LAG-3 expression by T cell clones correlated with IFN-γ production, and hence soluble LAG-3 has been suggested as a serological marker of Th1 responses.
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Figure: LAG-3 expression on activated human peripheral blood mononuclear cells (PBMC) detected with LAG-3 (human), mAb (17B4) (FITC) (Prod. No. ALX-804-806F).Method: T lymphocytes from human PBMC are stimulated with 1µg/ml of PHA for three days. Then, after seven days of culture, 3×106 three-days PHA-activated human PBMC are treated with LAG-3 (human), mAb (17B4) (FITC) (Prod. No. ALX-804-806F) or FITC coupled isotype-matched (IgG1) control MAb (used at a saturating dilution of 1/800 and 1/150 respectively) for 30 min. at 4°C in RPMI 1640 and washed twice with 1x PBS. Stained cells are then analysed by FACS [4].
Figure: Expression of LAG-3 on CD4+ and CD8+ subpopulations of tumour infiltrating lymphocytes (TILs) detected with LAG-3 (human), mAb (17B4) (FITC) (Prod. No. ALX-804-806F).Method: TILs from a dissociated renal cell carcinoma sample, stained with 5µg/ml LAG-3 (human), mAb (17B4) (FITC) (Prod. No. ALX-804-806F) and FITC-coupled anti-CD4 or -CD8, are analyzed by a two-colour FACS analysis. Additional staining with anti-CD3 allowed a gate analysis of total T cells. Values indicate percentages in each quadrant [5].
Figure: Specific inhibition of 17B4 staining.Method: LAG-3 (human), mAb (17B4) (FITC) (Prod. No. ALX-804-806F) (10µg/ml) (is preincubated with a specific peptide epitope (208b) or a control tetanus toxoid (TT) peptide at different molarities prior to staining of TILs. Stained cells are then analyzed by FACS.
Figure: Tumor infiltrating lymphocytes (TILs) express LAG-3 (detected using LAG-3 (human), mAb (17B4) (Prod. No. ALX-804-806)). Method: Freshly dissociated single cell suspensions of renal cell carcinoma TILs are incubated with LAG-3 (human), mAb (17B4) (FITC) (Prod. No. ALX-804-806) (5µg/ml) and anti-MHC Class II molecules (PE) for 30 min. and washed twice in saline buffer. Additional staining with anti-CD3 allowed a gate analysis of total T cells. The LAG-3 and MHC II profiles of CD3+-gated cells for 3 patients are shown [5].
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| Alternative Name | Lymphocyte activation gene-3, FDC protein, CD223 |
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| Application | ICC, IHC, IP, WB |
| Host | Mouse |
| Isotype | IgG1 |
| Species Reactivity | Human |
| Alternative Name | Lymphocyte activation gene-3, FDC protein, CD223 |
|---|---|
| Application | ELISA, WB |
| Host | Mouse |
| Isotype | IgG1 |
| Species Reactivity | Human |
| Alternative Name | Lymphocyte activation gene-3, FDC protein, CD223 |
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| Application | Flow Cytometry, ICC |
| Host | Mouse |
| Isotype | IgG1 |
| Species Reactivity | Human |
| Alternative Name | Lymphocyte activation gene-3, FDC protein, CD223 |
|---|---|
| Application | Flow Cytometry, ICC |
| Host | Mouse |
| Isotype | IgG1 |
| Species Reactivity | Human |