Measured by its ability to neutralize Flt‑3 Ligand-induced proliferation in BaFlt3 mouse pro‑B cell line transfected with mouse Flt‑3. Hannum, C. et al. (1994) Nature 368:643. The Neutralization Dose (ND50) is typically 0.02‑0.06 µg/mL in the presence of 5 ng/mL Recombinant Human Flt‑3 Ligand.
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.
Cell Proliferation Induced by Flt‑3 Ligand and Neutralization by Human Flt‑3 Ligand Antibody. Recombinant Human Flt‑3 Ligand (Catalog # 308-FK) stimulates proliferation in BaFlt3 mouse pro‑B cell line transfected with mouse Flt‑3 in a dose-dependent manner (orange line). Proliferation elicited by Recombinant Human Flt‑3 Ligand (5 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human Flt‑3 Ligand Antigen Affinity-purified Polyclonal Antibody (Catalog # AF-308-NA). The ND50 is typically 0.02-0.06 µg/mL.
Preparation and Storage
Reconstitute at 0.2 mg/mL in sterile PBS.
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
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: Flt-3 Ligand
Flt-3 Ligand, also known as FL, is an alpha -helical cytokine that promotes the differentiation of multiple hematopoietic cell lineages (1‑3). Mature human Flt-3 Ligand consists of a 158 amino acid (aa) extracellular domain (ECD) with a cytokine-like domain and a juxtamembrane tether region, a 21 aa transmembrane segment, and a 30 aa cytoplasmic tail (4‑7). Within the ECD, human Flt-3 Ligand shares 71% and 65% aa sequence identity with mouse and rat Flt-3 Ligand, respectively. Human and mouse Flt-3 Ligand show cross-species activity (4‑6). Flt-3 Ligand is expressed as a noncovalently-linked dimer by T cells and bone marrow and thymic fibroblasts (1, 8). Each 36 kDa chain carries approximately 12 kDa of N- and O-linked carbohydrates (8). Alternate splicing and proteolytic cleavage of the transmembrane form can generate a soluble 30 kDa fragment that includes the cytokine domain (4, 8). Alternate splicing of human Flt-3 Ligand also generates membrane-associated isoforms that contain either a truncated cytoplasmic tail or an 85 aa substitution following the cytokine domain (4, 5, 8). Both transmembrane and soluble Flt-3 Ligand signal through the tyrosine kinase receptor Flt-3/Flk-2 (3, 4, 6, 7). Flt-3 Ligand induces the expansion of monocytes and immature dendritic cells as well as early B cell lineage differentiation (2, 9). It synergizes with IL-3, GM-CSF, and SCF to promote the mobilization and myeloid differentiation of hematopoietic stem cells (4‑6). It cooperates with IL-2, -6, -7, and -15 to induce NK cell development and with IL-3, -7, and -11 to induce terminal B cell maturation (1, 10). Animal studies also show Flt‑3 Ligand to reduce the severity of experimentally induced allergic inflammation (11).
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Hannum, C. et al. (1994) Nature 368:643.
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Savvides, S.N. et al. (2000) Nat. Struct. Biol. 7:486.
McClanahan, T. et al. (1996) Blood 88:3371.
Diener, K.R. et al. (2008) Exp. Hematol. 36:51.
Farag, S.S. and M.A. Caligiuri (2006) Blood Rev. 20:123.
R&D Systems personnel manually curate a database that contains references using R&D Systems products.
The data collected includes not only links to publications in PubMed,
but also provides information about sample types, species, and experimental conditions.
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