Recombinant Human Flt-3 Ligand/FLT3L Protein

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Carrier Free

Catalog # Availability Size / Price Qty
308-FKN-005/CF
308-FKN-025/CF
308-FKN-100/CF
308-FKN-250/CF

With Carrier

Catalog # Availability Size / Price Qty
308-FKN-005
308-FKN-025
308-FKN-01M
308-FKN-100
308-FKN-250
Recombinant Human Flt-3 Ligand/FLT3L Protein Bioactivity
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Citations (10)
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Recombinant Human Flt-3 Ligand/FLT3L Protein Summary

Product Specifications

Purity
>97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Activity
Measured in a cell proliferation assay using BaF3 mouse pro‑B cells transfected with mouse Flt-3. The ED50 for this effect is 0.2-1 ng/mL.
The specific activity of Recombinant Human Flt-3 Ligand/FLT3L is approximately 1.2 x 103 U/μg, which is calibrated against Recombinant Human Flt-3 Ligand/FLT3L WHO Standard (NIBSC code: 96/532).   Specific activity is for reference purposes only and is not routinely tested.  
Source
Mouse myeloma cell line, NS0-derived human Flt-3 Ligand/FLT3L protein
Thr27-Pro185
Accession #
N-terminal Sequence
Analysis
Thr27
Predicted Molecular Mass
18 kDa
SDS-PAGE
Multiple bands between 24 kDa and 28 kDa, reducing conditions

Product Datasheets

308-FKN (with carrier)

308-FKN/CF (carrier free)

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

308-FKN

Formulation Lyophilized from a 0.2 μm filtered solution in Acetonitrile and TFA with BSA as a carrier protein.
Reconstitution Reconstitute at 100 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin.
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.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

308-FKN/CF

Formulation Lyophilized from a 0.2 μm filtered solution in Acetonitrile and TFA.
Reconstitution Reconstitute 5 µg vials at 50 µg/mL in sterile PBS. Reconstitute 25 µg or larger vials at 100-250 µg/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.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Data Images

Bioactivity Recombinant Human Flt-3 Ligand/FLT3L Protein Bioactivity View Larger

Recombinant Human Flt-3 Ligand (Catalog # 308-FKN) stimulates cell proliferation in the BaF3 mouse pro-B cell line transfected with mouse Flt-3. The ED50 for this effect is 0.2-1 ng/mL.

SDS-PAGE Recombinant Human Flt-3 Ligand/FLT3L Protein SDS-PAGE View Larger

1 µg/lane of Recombinant Human Flt-3 Ligand/FLT3L was resolved with SDS-PAGE under reducing (R) conditions and visualized by silver staining, showing major bands at 24-28 kDa. Multiple bands are due to variable glycosylation.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

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Background: Flt-3 Ligand/FLT3L

Flt‑3 Ligand, also known as FLT3L, 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 (4-6). The human and mouse Flt‑3 Ligand proteins show cross-species activity. Flt-3 Ligand is also structurally related to M-CSF and SCF. Flt-3 Ligand is widely expressed in various human and mouse tissues. It is expressed as a noncovalently-linked dimer by T cells and bone marrow and thymic fibroblasts (1, 8). Each 36 kDa chain of the Flt-3 Ligand dimer carries approximately 12 kDa of N- and O-linked carbohydrates (8). Alternate splicing and proteolytic cleavage of the transmembrane form of the Flt-3 Ligand protein can generate a soluble 30 kDa fragment that includes the cytokine-like 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-like domain in the ECD of the Flt-3 Ligand protein (4, 5, 8). Both transmembrane and soluble forms of 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). Additionally, Flt-3 Ligand synergizes with IL-3, GM-CSF, and SCF to promote the mobilization and myeloid differentiation of hematopoietic stem cells (4-6). Flt-3 Ligand also cooperates with IL-2, IL-6, IL-7, and IL-15 to induce NK cell development and with IL-3, IL-7, and IL-11 to induce terminal B cell maturation (1, 10). Animal studies show that Flt‑3 Ligand reduces the severity of experimentally induced allergic inflammation (11).

References
  1. Wodnar-Filipowicz, A. (2003) News Physiol. Sci. 18:247.
  2. Dong, J. et al. (2002) Cancer Biol. Ther. 1:486.
  3. Gilliland, D.G. and J.D. Griffin (2002) Blood 100:1532.
  4. Hannum, C. et al. (1994) Nature 368:643.
  5. Lyman, S.D. et al. (1994) Blood 83:2795.
  6. Lyman, S.D. et al. (1993) Cell 75:1157.
  7. Savvides, S.N. et al. (2000) Nat. Struct. Biol. 7:486.
  8. McClanahan, T. et al. (1996) Blood 88:3371.
  9. Diener, K.R. et al. (2008) Exp. Hematol. 36:51.
  10. Farag, S.S. and M.A. Caligiuri (2006) Blood Rev. 20:123.
  11. Edwan, J.H. et al. (2004) J. Immunol. 172:5016.
Long Name
fms-like Tyrosine Kinase 3 Ligand
Entrez Gene IDs
2323 (Human); 14256 (Mouse); 102125470 (Cynomolgus Monkey); 493796 (Feline)
Alternate Names
FL; FLG3L; Flt3 ligand; Flt-3 Ligand; Flt3L; FLT3LG; fms-related tyrosine kinase 3 ligand; SL cytokine

Citations for Recombinant Human Flt-3 Ligand/FLT3L Protein

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.

10 Citations: Showing 1 - 10
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  1. Hematopoietic stem cell cytokines and fibroblast growth factor-2 stimulate human endothelial cell-pericyte tube co-assembly in 3D fibrin matrices under serum-free defined conditions.
    Authors: Smith A, Bowers S, Stratman A, Davis G
    PLoS ONE, 2013;8(12):e85147.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  2. The canonical Wnt pathway shapes niches supportive of hematopoietic stem/progenitor cells.
    Authors: Ichii, Michiko, Frank, Mark Bar, Iozzo, Renato V, Kincade, Paul W
    Blood, 2012;119(7):1683-92.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  3. Optimal conditions for lentiviral transduction of engrafting human CD34+ cells.
    Authors: Uchida N, Hsieh MM, Hayakawa J, Madison C, Washington KN, Tisdale JF
    Gene Ther., 2011;18(11):1078-86.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  4. Hematopoietic differentiation of induced pluripotent stem cells from patients with mucopolysaccharidosis type I (Hurler syndrome).
    Authors: Tolar J, Park I, Xia L, Lees C, Peacock B, Webber B, McElmurry R, Eide C, Orchard P, Kyba M, Osborn M, Lund T, Wagner J, Daley G, Blazar B
    Blood, 2011;117(3):839-47.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  5. Wnt3a activates dormant c-Kit(-) bone marrow-derived cells with short-term multilineage hematopoietic reconstitution capacity.
    Authors: Trowbridge JJ, Guezguez B, Moon RT
    Stem Cells, 2010;28(8):1379-89.
    Species: Mouse
    Sample Types: Whole Cells
    Applications: Bioassay
  6. Mouse fetal and embryonic liver cells differentiate human umbilical cord blood progenitors into CD56-negative natural killer cell precursors in the absence of interleukin-15.
    Authors: McCullar V, Oostendorp R, Panoskaltsis-Mortari A, Yun G, Lutz CT, Wagner JE, Miller JS
    Exp. Hematol., 2008;36(5):598-608.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  7. Interaction with human stromal cells enhances CXCR4 expression and engraftment of cord blood Lin(-)CD34(-) cells.
    Authors: Kobune M, Kawano Y, Takahashi S, Takada K, Murase K, Iyama S, Sato T, Takimoto R, Niitsu Y, Kato J
    Exp. Hematol., 2008;36(9):1121-31.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  8. Virally mediated MafB transduction induces the monocyte commitment of human CD34+ hematopoietic stem/progenitor cells.
    Authors: Gemelli C, Montanari M, Tenedini E, Zanocco Marani T, Vignudelli T, Siena M, Zini R, Salati S, Tagliafico E, Manfredini R, Grande A, Ferrari S
    Cell Death Differ., 2006;13(10):1686-96.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  9. BMP-6 inhibits human bone marrow B lymphopoiesis--upregulation of Id1 and Id3.
    Authors: Kersten C, Dosen G, Myklebust JH, Sivertsen EA, Hystad ME, Smeland EB, Rian E
    Exp. Hematol., 2006;34(1):72-81.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  10. Prospective isolation of human clonogenic common myeloid progenitors.
    Authors: Manz MG, Miyamoto T, Akashi K, Weissman IL
    Proc. Natl. Acad. Sci. U.S.A., 2002;99(18):11872-7.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay

FAQs

  1. What are the differences between Recombinant Human Flt-3 Ligand/FLT3L Protein (Catalog # 308-FK), Recombinant Human Flt-3 Ligand/FLT3L Protein (Catalog # 308-FKN), and Recombinant Human Flt-3 Ligand/FLT3L Protein, CF (Catalog # 308-FKE)?

    • Recombinant Human Flt-3 Ligand/FLT3L Protein (Catalog # 308-FK) and Recombinant Human Flt-3 Ligand/FLT3L Protein (Catalog # 308-FKN) share the same protein sequence, Thr27-Pro185 of Accession # AAA17999.1 but Catalog # 308-FK was expressed in Sf 21 baculovirus cells and Catalog # 308-FKN was produced in mammalian NS0 cells. Both of these proteins are glycosylated and available bottled with BSA or without BSA (Carrier-Free).  Recombinant Human Flt-3 Ligand/FLT3L Protein, CF (Catalog # 308-FKE) was produced in an E. Coli expression system and has a sequence of (Thr27-Ala181, Accession # P49771.1), but may also contain an N-terminal Methionine followed by the expected sequence. In addition to being slightly shorter compared to 308-FKN and 308-FK, there is one difference in amino acid at position 72. Accession # AAA17999.1 has an Alanine at position 72, while Accession # P49771.1 has a Glycine in that position. All three versions of Recombinant Human Flt-3 Ligand/FLT3L proteins are routinely tested and have the same activity range in our QC testing assay: Measured in a cell proliferation assay using BaF3 mouse pro‑B cells transfected with mouse Flt-3. The ED50 for this effect is 0.2-1 ng/mL.  R&D Systems also offers two GMP versions of this protein, an E. coli-derived animal-free version, Recombinant Human Flt-3 Ligand/FLT3L GMP Protein, CF (Catalog # 308E-GMP), and an Sf-21 baculovirus-derived version, Recombinant Human Flt-3 Ligand GMP Protein, CF (Catalog # 308-GMP). For information on the GMP proteins, we recommend consulting the product-specific pages for each protein. To determine which of these three proteins is most suitable for an application, we would recommend checking the Citations tab on the product-specific page.

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