Description
ISOkine® Flt-3 Ligand (FLT3L) Human, Animal-Free Recombinant Protein is a high-purity, bioactive growth factor expressed in barley grain and provided as a lyophilized powder. The protein produced under ISO 9001:2015 conditions contains 155 amino acids and an N-terminal 6 amino acid histidine tag for a total length of 161 amino acids and has a predicted molecular mass of 18.44 kDa.
ISOkine® growth factors and cytokines are animal-free (AOF/ACF), serum-free, and void of antibiotics, endotoxins, viruses, and prions.
Summary
Flt-3 ligand (FMS related tyrosine kinase 3 ligand, flk-2 ligand) is involved in proliferation and differentiation of early hematopoietic cells. Flt-3 ligand synergizes with other CSFs and interleukins to induce proliferation of early hematopoietic cells but does not stimulate growth or differentiation alone. Flt-3 ligand binds to cells expressing the tyrosine kinase receptor Flt3. Multiple isoforms of Flt-3 ligand have been identified but the predominant biologically active isoform is a transmembrane protein which can be proteolytically cleaved to generate a biologically active soluble form.
Source
Expression Host: Produced in the endosperm tissue of barley grain (Hordeum vulgare) plants.
Manufacturer: ORF Genetics
Country of Origin: Iceland
Formulation
2xPBS pH 7.2, sterile filtered through 0.22 µm filter
Purity
≥ 95% by SDS-PAGE gel analysis.
Reconstitution
Always centrifuge the vial before opening. It is recommended to reconstitute the lyophilized protein in sterile phosphate-buffered saline to a concentration of no less than 100 µg/ml. For long-term storage of the reconstituted solution, it is recommended to add a carrier protein (0.1% HSA or BSA).
Stability
The lyophilized protein, though stable at room temperature for a few weeks, is best stored at -20°C. Reconstituted protein should be used immediately or stored in working aliquots at -20°C. Avoid repeated freeze-thaw cycles.
Biological Activity
Each batch of ISOkine® growth factors is tested for bioactivity and verified to have comparable activity to a commercial source. The bioactivity of ISOkine® recombinant human Flt-3 ligand is assayed by measuring its dose-dependent effect on the proliferation of AML5 cells. The ED50 for this effect using Flt-3 ligand is typically <1 ng/ml. Optimal concentration should be determined for specific applications and cell lines.
Endotoxin Level
Endotoxin level is < 0.01 EU per μg of ISOkine® product by LAL method.
Pyrogen Free
Purified ISOkine® product carries no pyrogenic or pro-inflammatory contaminants, as assayed with monocyte activation test (MAT Assay) using Human 10-plex Cytokine Assay measuring IL-6, TNF-alpha, and IL-1 beta induction.
Usage
This product is intended for laboratory research use only. Not for use in diagnostic or therapeutic procedures. This product may not be used as a pharmaceutical or veterinary drug, agricultural product, or food additive.
Synonyms
Flt3 Ligand, Fms-related tyrosine kinase 3 ligand, FLT3LG, SL cytokine.
Documents
Product References
- Root, Sierra H, and Héctor L Aguila. “Novel population of human monocyte and osteoclast progenitors from pluripotent stem cells and peripheral blood.” Blood advances vol. 5,21 (2021): 4435-4446. doi:10.1182/bloodadvances.2021004552
- Razmkhah, Farnaz et al. “Leukemia microvesicles affect healthy hematopoietic stem cells.” Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine vol. 39,2 (2017): 1010428317692234. doi:10.1177/1010428317692234
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Ilex Life Sciences LLC is an authorized worldwide distributor of ISOkine® growth factors & cytokines manufactured by ORF Genetics Ltd.