| 货号 | AB-203-NA |
| 别名 | Hematopoietic growth factor; IL-3MGC79398; interleukin 3 (colony-stimulating factor, multiple); interleukin-3; Mast cell growth factor; mast-cell growth factor; MCGFMGC79399; MULTI-CSF; multilineage-colony-stimulating factor; Multipotential colony-stimulating factor; P-cell stimulating factor; P-cell-stimulating factor | 全称 | Interleukin 3 |
| 反应种属 | Human |
| 应用 | Western Blot(1 µg/mL) Immunocytochemistry(5-15 µg/mL) |
| 目标/特异性 | 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. |
| 使用方法 | Western Blot: 1 µg/mL Immunocytochemistry: 5-15 µg/mL 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. |
| 来源 | Polyclonal Goat IgG |
| 产品组分 |
| 供应商 | R&D Systems |
| Entrez Gene IDs | 3562 (Human); 16187 (Mouse); 24495 (Rat) |
| 纯化方式 | Protein A or G purified |
| 免疫原 | E. coli-derived recombinant human IL-3 Ala20-Phe152 Accession # Q6GS87 |
| 内毒素水平 | <0.10 EU per 1 μg of the antibody by the LAL method. |
| 生物活性 | Human |
| 标记 | Unconjugated |
| 溶解方法 | Reconstitute at 1 mg/mL in sterile PBS. |
| 背景 | 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+TReg 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. |
| 运输条件 | Blue Ice |
| 存放说明 | -20℃ |
| 参考文献 |
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Cell Proliferation Induced by IL‑3 and Neutralization 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. |
