Feline Flt-3 Ligand/FLT3L Antibody Summary
Accession # NP_001009842
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/FLT3L and Neutralization by Feline Flt-3 Ligand/FLT3L Antibody. Recombinant Feline Flt-3 Ligand/FLT3L (Catalog # 2467-FL) 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 Feline Flt-3 Ligand/FLT3L (2 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Feline Flt-3 Ligand/FLT3L Antigen Affinity-purified Polyclonal Antibody (Catalog # AF2467). The ND50is typically 0.1-0.4 µg/mL.
Flt-3 Ligand/FLT3L in Feline PBMCs. Flt-3 Ligand/FLT3L was detected in immersion fixed feline peripheral blood mononuclear cells (PBMCs) using Goat Anti-Feline Flt-3 Ligand/FLT3L Antigen Affinity-purified Polyclonal Antibody (Catalog # AF2467) at 15 µg/mL for 3 hours at room temperature. Cells were stained using the NorthernLights™ 557-conjugated Anti-Goat IgG Secondary Antibody (red; Catalog # NL001) and counterstained with DAPI (blue). Specific staining was localized to cytoplasm. View our protocol for Fluorescent ICC Staining of Non-adherent Cells.
Preparation and Storage
- 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/FLT3L
Flt-3 Ligand, also known as FL, is an alpha -helical cytokine that promotes the differentiation of multiple hematopoietic cell lineages (1‑3). Mature feline Flt-3 Ligand consists of a 156 amino acid (aa) extracellular region with a cytokine-like domain and a juxtamembrane tether region, a 21 aa transmembrane segment, and an 88 aa cytoplasmic tail (4, 5). Within the ECD, feline Flt-3 Ligand shares 92%, 81%, 70%, and 63% aa sequence identity with canine, human, mouse, and rat Flt-3 Ligand, respectively. Flt-3 Ligand is expressed as a noncovalently-linked dimer by T cells and bone marrow and thymic fibroblasts (1, 6). Each 36 kDa chain carries approximately 12 kDa of N- and O-linked carbohydrates (6). Alternate splicing and proteolytic cleavage of the transmembrane form can generate a soluble 30 kDa fragment that includes the cytokine domain (6, 7). Multiple splice forms of canine, human, and mouse Flt-3 Ligand have been described and may also exist in feline (4, 6‑10). Both transmembrane and soluble Flt-3 Ligand signal through the tyrosine kinase receptor Flt-3/Flk-2 (3, 5, 7, 10). Flt-3 Ligand induces the expansion of monocytes and immature dendritic cells as well as early B cell lineage differentiation (2, 11). It synergizes with IL-3, GM-CSF, and SCF to promote the mobilization and myeloid differentiation of hematopoietic stem cells (7, 8, 10). 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, 12). Animal studies also show Flt-3 Ligand to reduce the severity of experimentally induced allergic inflammation (13).
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