- RPA-T4 (See other available formats)
- Regulatory Status
- IV T114
- Other Names
- Mouse IgG1, κ
- Ave. Rating
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- Product Citations
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CD4, also known as T4, is a 55 kD single-chain type I transmembrane glycoprotein expressed on most thymocytes, a subset of T cells, and monocytes/macrophages. CD4, a member of the Ig superfamily, recognizes antigens associated with MHC class II molecules, and participates in cell-cell interactions, thymic differentiation, and signal transduction. CD4 acts as a primary receptor for HIV, binding to HIV gp120. CD4 has also been shown to interact with IL-16.Product Details
- Human, Chimpanzee
- Antibody Type
- Host Species
µg size: Phosphate-buffered solution, pH 7.2, containing 0.09% sodium azide.
test sizes: Phosphate-buffered solution, pH 7.2, containing 0.09% sodium azide and 0.2% (w/v) BSA (origin USA).
- The antibody was purified by affinity chromatography, and conjugated with APC under optimal conditions.
µg sizes: 0.2 mg/ml
test sizes: lot-specific (please contact technical support for concentration and total µg amount)
- Storage & Handling
- The CD4 antibody solution should be stored undiluted between 2°C and 8°C, and protected from prolonged exposure to light. Do not freeze.
FC - Quality tested
- Recommended Usage
Each lot of this antibody is quality control tested by immunofluorescent staining with flow cytometric analysis. For flow cytometric staining using the µg size, the suggested use of this reagent is ≤0.25 µg per million cells in 100 µl volume. It is recommended that the reagent be titrated for optimal performance for each application. For flow cytometric staining using the test sizes, the suggested use of this reagent is 5 µl per million cells in 100 µl staining volume or 5 µl per 100 µl of whole blood.
- Excitation Laser
Red Laser (633 nm)
- Application Notes
The RPA-T4 antibody binds to the D1 domain of CD4 (CDR1 and CDR3 epitopes) and can block HIV gp120 binding and inhibit syncytia formation. Additional reported applications (for the relevant formats) include: immunohistochemistry of acetone-fixed frozen sections3,4,5, and blocking of T cell activation1,2. This clone was tested in-house and does not work on formalin fixed paraffin-embedded (FFPE) tissue. The Ultra-LEAF™ purified antibody (Endotoxin < 0.01 EU/µg, Azide-Free, 0.2 µm filtered) is recommended for functional assays (Cat. No. 300569 - 300574).
- Application References
- Knapp W, et al. 1989. Leucocyte Typing IV. Oxford University Press. New York. (Activ)
- Moir S, et al. 1999. J. Virol. 73:7972. (Activ)
- Deng MC, et al. 1995. Circulation 91:1647. (IHC)
- Friedman T, et al. 1999. J. Immunol. 162:5256. (IHC)
- Mack CL, et al. 2004. Pediatr. Res. 56:79. (IHC)
- Lan RY, et al. 2006. Hepatology 43:729.
- Zenaro E, et al. 2009. J. Leukoc. Biol. 86:1393. (FC) PubMed
- Yoshino N, et al. 2000. Exp. Anim. (Tokyo) 49:97. (FC)
- Stoeckius M, et al. 2017. Nat. Methods. 14:865. (PG)
- Product Citations
AB_314082 (BioLegend Cat. No. 300514)
AB_2564153 (BioLegend Cat. No. 300552)
AB_2562051 (BioLegend Cat. No. 300537)
- Ig superfamily, type I transmembrane glycoprotein, 55 kD
T cell subset, majority of thymocytes, monocytes/macrophages
- MHC class II co-receptor, lymphocyte adhesion, thymic differentiation, HIV receptor
- MHC class II molecules, HIV gp120, IL-16
- Cell Type
- Dendritic cells, Macrophages, Monocytes, T cells, Thymocytes, Tregs
- Biology Area
- Molecular Family
- CD Molecules
- Antigen References
1. Center D, et al. 1996. Immunol. Today 17:476.
2. Gaubin M, et al. 1996. Eur. J. Clin. Chem. Clin. Biochem. 34:723.
- Gene ID
- 920 View all products for this Gene ID
- View information about CD4 on UniProt.org
- I am unable to see expression of T cell markers such as CD3 and CD4 post activation.
- TCR-CD3 complexes on the T-lymphocyte surface are rapidly downregulated upon activation with peptide-MHC complex, superantigen or cross-linking with anti-TCR or anti-CD3 antibodies. PMA/Ionomycin treatment has been shown to downregulate surface CD4 expression. Receptor downregulation is a common biological phenomenon and so make sure that your stimulation treatment is not causing it in your sample type.
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