Human IL-3 Antibody

Catalog #: AB-203-NA Datasheet / COA / SDS

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AB-203-NA

Cell Proliferation Induced by IL‑3 and Neutral-ization by Human IL‑3 Antibody.

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Human IL-3 Antibody Summary

Species Reactivity

Human

Specificity

Detects human IL-3 in direct ELISAs and Western blots. In direct ELISA, less than 1% cross-reactivity with recombinant mouse IL-3 and recombinant rat IL-3 is observed.

Source

Polyclonal Goat IgG

Purification

Protein A or G purified

Immunogen

E. coli-derived recombinant human IL-3
Ala20-Phe152
Accession # Q6GS87

Formulation

Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.

Endotoxin Level

<0.10 EU per 1 μg of the antibody by the LAL method.

Applications

Recommended Concentration

Sample

Western Blot

1 µg/mL

Recombinant Human IL‑3 (Catalog # 203-IL)

Immunocytochemistry

5-15 µg/mL

Immersion fixed human peripheral blood lymphocytes

Neutralization

Measured by its ability to neutralize IL‑3-induced proliferation in the TF‑1 human erythroleukemic cell line. Kitamura, T. et al. (1989) J. Cell Physiol. 140:323. The Neutralization Dose (ND₅₀) is typically 0.4-2 µg/mL in the presence of 1.25 ng/mL Recombinant Human IL‑3.

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

Neutralization

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Cell Proliferation Induced by IL‑3 and Neutral-ization by Human IL‑3 Antibody. Recombinant Human IL-3 (Catalog # 203-IL) stimulates proliferation in the TF-1 human erythroleukemic cell line in a dose-dependent manner (orange line). Proliferation elicited by Recombinant Human IL-3 (1.25 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human IL-3 Polyclonal Antibody (Catalog # AB-203-NA). The ND₅₀ is typically 0.4-2 µg/mL.

Reconstitution Calculator

Preparation and Storage

Reconstitution

Reconstitute at 1 mg/mL in sterile PBS.

Shipping

The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.

Stability & Storage

Use a manual defrost freezer and avoid repeated freeze-thaw cycles.

12 months from date of receipt, -20 to -70 °C as supplied.
1 month, 2 to 8 °C under sterile conditions after reconstitution.
6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: IL-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⁺ T_Reg 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

Triebel, F. et al. (1990) J. Exp. Med. 171:1393.
Baixeras, E. et al. (1992) J. Exp. Med 176:327.
Workman, C.J. and D.A. Vignali (2003) Eur. J. Immunol. 33:970.
Workman, C.J. et al. (2004) J. Immunol. 172:5450.
Huang, C.T. et al. (2004) Immunity 21:503.
Andreae, S. et al. (2003) Blood 102:2130.

Long Name

Interleukin 3

Entrez Gene IDs

3562 (Human); 16187 (Mouse); 24495 (Rat)

Alternate Names

Hematopoietic growth factor; IL3; IL-3; IL-3MGC79398; interleukin 3 (colony-stimulating factor, multiple); interleukin-3; Mast cell growth factor; mast-cell growth factor; MCGF; MCGFMGC79399; MULTI-CSF; multilineage-colony-stimulating factor; Multipotential colony-stimulating factor; P-cell stimulating factor; P-cell-stimulating factor