Recombinant Human Flt-3 Ligand/FLT3L Protein


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 more
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.

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Reactivity HuSpecies Glossary
Applications Bioactivity

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Recombinant Human Flt-3 Ligand/FLT3L Protein Summary

Additional Information
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Details of Functionality
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).
Mouse myeloma cell line, NS0-derived human Flt-3 Ligand/FLT3L protein
Accession #
N-terminal Sequence
Protein/Peptide Type
Recombinant Proteins
>97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Note
<0.10 EU per 1 μg of the protein by the LAL method.


Theoretical MW
18 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
Multiple bands between 24 kDa and 28 kDa, reducing conditions
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308-FKN in the following applications:

Packaging, Storage & Formulations

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.
Lyophilized from a 0.2 μm filtered solution in Acetonitrile and TFA with BSA as a carrier protein.
>97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Reconstitution Instructions
Reconstitute at 100 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin.


This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant Human Flt-3 Ligand/FLT3L Protein

  • FL
  • FLG3L
  • Flt3 ligand
  • Flt-3 Ligand
  • Flt3L
  • FLT3LG
  • fms-related tyrosine kinase 3 ligand
  • SL cytokine


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).
  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.

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Publications for Flt-3 Ligand/FLT3L (308-FKN)(10)

We have publications tested in 2 confirmed species: Human, Mouse.

We have publications tested in 1 application: Bioassay.

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Showing Publications 1 - 10 of 10.
Publications using 308-FKN Applications Species
Smith A, Bowers S, Stratman A, Davis G 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. PLoS ONE, 2013;8(12):e85147. 2013 [PMID: 24391990] (Bioassay, Human) Bioassay Human
Ichii, Michiko, Frank, Mark Bar, Iozzo, Renato V, Kincade, Paul W The canonical Wnt pathway shapes niches supportive of hematopoietic stem/progenitor cells. Blood, 2012;119(7):1683-92. 2012 [PMID: 22117039] (Bioassay, Human) Bioassay Human
Uchida N, Hsieh MM, Hayakawa J, Madison C, Washington KN, Tisdale JF Optimal conditions for lentiviral transduction of engrafting human CD34+ cells. Gene Ther., 2011;18(11):1078-86. 2011 [PMID: 21544097] (Bioassay, Human) Bioassay Human
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 Hematopoietic differentiation of induced pluripotent stem cells from patients with mucopolysaccharidosis type I (Hurler syndrome). Blood, 2011;117(3):839-47. 2011 [PMID: 21037085] (Bioassay, Human) Bioassay Human
Trowbridge JJ, Guezguez B, Moon RT Wnt3a activates dormant c-Kit(-) bone marrow-derived cells with short-term multilineage hematopoietic reconstitution capacity. Stem Cells, 2010;28(8):1379-89. 2010 [PMID: 20521329] (Bioassay, Mouse) Bioassay Mouse
Kobune M, Kawano Y, Takahashi S, Takada K, Murase K, Iyama S, Sato T, Takimoto R, Niitsu Y, Kato J Interaction with human stromal cells enhances CXCR4 expression and engraftment of cord blood Lin(-)CD34(-) cells. Exp. Hematol., 2008;36(9):1121-31. 2008 [PMID: 18562079] (Bioassay, Human) Bioassay Human
McCullar V, Oostendorp R, Panoskaltsis-Mortari A, Yun G, Lutz CT, Wagner JE, Miller JS 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. Exp. Hematol., 2008;36(5):598-608. 2008 [PMID: 18295962] (Bioassay, Human) Bioassay Human
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 Virally mediated MafB transduction induces the monocyte commitment of human CD34+ hematopoietic stem/progenitor cells. Cell Death Differ., 2006;13(10):1686-96. 2006 [PMID: 16456583] (Bioassay, Human) Bioassay Human
Kersten C, Dosen G, Myklebust JH, Sivertsen EA, Hystad ME, Smeland EB, Rian E BMP-6 inhibits human bone marrow B lymphopoiesis--upregulation of Id1 and Id3. Exp. Hematol., 2006;34(1):72-81. 2006 [PMID: 16413393] (Bioassay, Human) Bioassay Human
Manz MG, Miyamoto T, Akashi K, Weissman IL Prospective isolation of human clonogenic common myeloid progenitors. Proc. Natl. Acad. Sci. U.S.A., 2002;99(18):11872-7. 2002 [PMID: 12193648] (Bioassay, Human) Bioassay Human

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Gene Symbol FLT3LG