Recombinant Human IL-3

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Pricing & Details

Product. No.I-185
Alternate Names
Interleukin-3, Mast Cell Growth Factor [MCGF], Multi-CSF, HCGF, Multi-CSF, HCGF, P-Cell Stimulation Factor, MCGF, MGC79398, MGC79399, MULTI-CSF
Expression Host
E. coli
Prod No.
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I-185-10 µg
10 µg
In stock
Min: 1
Step: 1
I-185-50 µg
50 µg
In stock
Min: 1
Step: 1
I-185-100 µg
100 µg
In stock
Min: 1
Step: 1
Bulk quantities available. Contact us for pricing.


IL-3 is a 17 kD pleiotropic cytokine and a member of a family of growth factors that sustains both the proliferation and the development of hematopoietic precursors. It also displays neurotrophic activity and is thought to be associated with neurologic disorders. Signal transmission is assured by high affinity binding to the IL-3 receptor (IL3RA). The receptor contains α and β subunits. IL-3 shares the β subunit with IL-5 and GM-CSF which explains their biological functional similarities. The IL-3/receptor complex induces JAK2/STAT5 cell signalization pathway and it can stimulate both the activation of gene expression and the suppression of apoptosis via transcription factor c‑myc and the Ras pathway, respectively. IL-3 fuels the differentiation of multipotent hematopoietic stem cells into myeloid progenitor cells or lymphoid progenitor cells (when in conjunction with IL-7). Together with other cytokines, including EPO, GM-CSF, and IL-6, IL-3 can stimulate proliferation of all cells in the myeloid lineage. The constitutive expression of IL-3 in some leukemia cell lines (as opposed to selective T-cell expression in response to specific impulses or antigens) is thought to fuel the development of the disease. Post-chemotherapy IL-3 application can promote regeneration of granulocytes and platelets. Furthermore, during high-dose chemotherapy, the combination of IL-3, GM-CSF and stem cell factor increases peripheral blood stem cells. IL-3 is thought to have therapeutic potential in lymphohematopoietic disorders and solid cancers.

Protein Details

>97% by SDS-PAGE and analyzed by silver stain.
Endotoxin Level
<0.1 EU/µg as determined by the LAL method
Biological Activity
The biological activity of Human IL-3 was determined by a cell proliferation assay using a human, factor-dependent cell line, TF-1 (Kitamura, T. et al., 1989, J. Cell Physiol. 140:323 - 334). The expected ED50 for this effect is typically 0.1 - 0.4 ng/ml.
Expression Host
E. coli
Protein Accession No.
Amino Acid Sequence
N-terminal Sequence Analysis
Ala20 and Met
State of Matter
Predicted Molecular Mass
The predicted molecular weight of Recombinant Human IL-3 is Mr 15 kDa. However, the actual molecular weight as observed by migration on SDS-PAGE is 14 kDa (reducing conditions).
This recombinant protein was 0.2 µm filtered and lyophilized from modified Dulbecco’s phosphate buffered saline (1X PBS) pH 7.2 – 7.4 with no calcium, magnesium, or preservatives present.
Storage and Stability
This lyophilized protein is stable for six to twelve months when stored desiccated at -20°C to -70°C. After aseptic reconstitution, this protein may be stored at 2°C to 8°C for one month or at -20°C to -70°C in a manual defrost freezer. Avoid Repeated Freeze Thaw Cycles. See Product Insert for exact lot specific storage instructions.
Country of Origin
Next Day Ambient
NCBI Gene Bank

References & Citations

1. Laston, D. et al. (1998) Science 241: 1820
IMPORTANT Use lot specific datasheet for all technical information pertaining to this recombinant protein.
Products are for research use only. Not for use in diagnostic or therapeutic procedures.
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