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Each lot of this FOXP3 antibody is quality control tested by immunofluorescent intracellular staining with flow cytometric analysis. For immunofluorescent staining, the suggested use of this reagent is 5 µl per 106 cells in 100 µl volume. It is recommended that the reagent be titrated for optimal performance for each application.
* Alexa Fluor® 647 has a maximum emission of 668 nm when it is excited at 633nm / 635nm. ** Alexa Fluor® is a registered trademark of Molecular Probes, Inc. Alexa Fluor® dye antibody conjugates are sold under license from Molecular Probes, Inc. for research use only, except for use in combination with microarrays and high content screening, and are covered by pending and issued patents.
Additional reported applications (for the relevant formats) include: immunohistochemical staining1 of acetone-fixed frozen sections and formalin-fixed paraffin-embedded sections, and Western blotting1. The binding of 206D to FOXP3 can be partially blocked by 259D, but 206D does not show significant blocking effect on 259D binding.
Surface Staining & FOXP3 Buffer Preparation:
Centrifugation steps: perform at 250Xg for 5min Incubation steps: perform at room temperature
NOTE: The FOXP3 Perm buffer (10X) may have crystalization or precipitation observed when it is stored at 2-8°C, however, it is normal and does not affect the buffer performance. If there is a heavy precipitation observed after diluting to 1X working solution, it may be clarified by filtering. Caution: The FOXP3 Fix/Perm buffer contains paraformaldehyde, which is toxigenic and mutagenic. Please handle with caution and wear gloves, lab coat and necessary protection to avoid direct body contact.
FOXP3 Intracellular Staining Procedures:
3. Add 1 ml of 1X Biolegend's FOXP3 Fix/Perm solution to each tube, resuspend the cells (gentle vortex) and incubate at room temperature in the dark for 20 minutes, then centrifuge and remove the supernatant. The cell pellet will now be translucent and difficult to see; take care not to dislodge and accidentally aspirate cells at all later stages of staining protocol. 4. Wash: resuspend cells in cell staining buffer (Cat. No. 420201); centrifuge, then discard the supernatant. 5. Wash: resuspend in 1ml 1X BioLegend's FOXP3 Perm buffer; centrifuge, then discard the supernatant. 6. Resuspend cells in 1ml 1X BioLegend's FOXP3 Perm buffer, incubate in the dark for 15 minutes; centrifuge, then discard the supernatant. Resuspend the pellet in 100 µl of 1X BioLegend's FOXP3 Perm buffer. 7. Add appropriate amount of flurochrome conjugated anti-FOXP3 antibody and incubate at room temperature in the dark for 30 minutes. 8. Wash twice with cell staining buffer (see step 4) then resuspend in 0.5 ml cell staining buffer. Analyze with flow cytometer using appropriate instrument settings.
NOTE: BioLegend's FOXP3 Fix/Perm buffer set (Cat. No. 421403) is specifically developed and formulated for intracellular staining FOXP3 with minimum effect on surface fluorochrome staining and is highly recommended for optimal result of FOXP3 intracellular immunofluorescence staining.
FOXP3 is a 50-55 kD transcription factor, also known as Forkhead box protein P3, Scurfin, JM2, or IPEX. It is proposed to be a master regulatory gene and more specific marker of T regulatory cells than most cell surface markers (such as CD4 and CD25). Transduced expression of FOXP3 in CD4+/CD25- cells has been shown to induce GITR, CD103, and CTLA4 and impart a T regulatory cell phenotype. FOXP3 is mutated in X-linked autoimmunity-allergic dysregulation syndrome (XLAAD or IPEX) in humans and in "scurfy" mice. Overexpression of FOXP3 has been shown to lead to a hypoactive immune state suggesting that this transcriptional factor is a central regulator of T cell activity. In human, unlike in mouse, two isoforms of FOXP3 have been reported: one (FOXP3) corresponding to the canonical full-length sequence; the other (FOXP3 δ2) lacking exon 2. The 206D antibody recognizes human FOXP3 epitope in the region of amino acids 105-235.
Forkhead box protein P3, Scurfin, JM2, IPEX, Zinc finger protein JM2
Forkhead/winged-helix transcription factor family, approximately 50 kD, contains zinc finger and forkhead domains
Nuclear; expressed in T regulatory cells
Transcription factor proposed to be a master regulatory gene in T regulatory cell development and a critical factor for immune homeostasis
FOXP3 is present at high levels in T regulatory cell can also be induced by T cell activation
Interacts with DNA
1. Hori S, et al. 2003. Science 299:1057. 2. Gandhi R, et al. 2010. Nat. Immunol. 11:846.
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This data display is provided for general comparisons between formats. Your actual data may vary due to variations in samples, target cells, instruments and their settings, staining conditions, and other factors. If you need assistance with selecting the best format contact our expert technical support team.
Purified anti-human FOXP3
Cell extract from HEK293T cells transfected with human FoxP3 cDNA was resolved by electrophoresis, transferred to nitrocellulose, and probed with monoclonal anti-FoxP3 antibody (clone 206D). Proteins were visualized using a goat anti-mouse secondary conjugated to HRP and a chemiluminescence detection system.
Alexa Fluor® 488 anti-human FOXP3
Human PBMCs were surface stained with CD4-APC, CD25-PE and intracellular stained with 206D Alexa Fluor® 488
Alexa Fluor® 647 anti-human FOXP3
Human peripheral blood lymphocytes surface stained with FITC CD4 (RPA-T4) and then intracellularly stained with Alexa Fluor® 647 206D
FITC anti-human FOXP3
Human peripheral blood lymphocytes surface stained with PE/Cy5 CD4 (RPA-T4) and PE CD25 (BC96), then intracellularly stained with FITC 206D. The data shown was gated on CD4+ cells.
Pacific Blue™ anti-human FOXP3
Dot plots of human peripheral blood lymphocytes stained with CD4-PE/Cy7, CD25-PE, and FOXP3 206D-Pacific Blue™.
PE anti-human FOXP3
Human peripheral blood lymphocytes surface stained with CD4 FITC and then intracellular stained with 206D PE