Recombinant Human IL-3 Protein


1 μg/lane of Recombinant Human IL-3 was resolved with SDS-PAGE under reducing (R) conditions and visualized by silver staining, showing a single band at 14 kDa.
Recombinant Human IL-3 (Catalog # 203-IL) stimulates cell proliferation of the TF-1 human erythroleukemic cell line. The ED50 for this effect is 0.02-0.1 ng/mL.

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Recombinant Human IL-3 Protein Summary

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Details of Functionality
Measured in a cell proliferation assay using TF‑1 human erythroleukemic cells. Kitamura, T. et al. (1989) J. Cell Physiol. 140:323. The ED50 for this effect is 0.02-0.1 ng/mL.
The specific activity of Recombinant Human IL-3 is approximately 1.8 x 103 IU/μg, which is calibrated against recombinant human IL-3 WHO International Standard (NIBSC code: 91/510).
E. coli-derived human IL-3 protein
Ala20-Phe152, with and without an N-terminal Met
Accession #
N-terminal Sequence
Ala20 and Met
Protein/Peptide Type
Recombinant Proteins
>97%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Note
<0.10 EU per 1 μg of the protein by the LAL method.


Theoretical MW
15 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.
Read Publications using
203-IL 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 PBS with BSA as a carrier protein.
>97%, by SDS-PAGE under reducing conditions and visualized by silver stain.
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 IL-3 Protein

  • Hematopoietic growth factor
  • IL3
  • IL-3
  • IL-3MGC79398
  • interleukin 3 (colony-stimulating factor, multiple)
  • interleukin-3
  • Mast cell growth factor
  • mast-cell growth factor
  • MCGF
  • MCGFMGC79399
  • multilineage-colony-stimulating factor
  • Multipotential colony-stimulating factor
  • P-cell stimulating factor
  • P-cell-stimulating factor


Interleukin 3 is a pleiotropic factor produced primarily by activated T cells that can stimulate the proliferation and differentiation of pluripotent hematopoietic stem cells as well as various lineage committed progenitors. In addition, IL-3 also affects the functional activity of mature mast cells, basophils, eosinophils and macrophages. Because of its multiple functions and targets, it was originally studied under different names, including mast cell growth factor, P-cell stimulating factor, burst promoting activity, multi-colony stimulating factor, thy-1 inducing factor and WEHI-3 growth factor. In addition to activated T cells, other cell types such as human thymic epithelial cells, activated murine mast cells, murine keratinocytes and neurons/astrocytes can also produce IL-3. At the amino acid sequence level, mature human and murine IL-3 share only 29% sequence identity. Consistent with this lack of homology, IL-3 activity is highly species-specific and human IL-3 does not show activity on murine cells.

IL-3 exerts its biological activities through binding to specific cell surface receptors. The high affinity receptor responsible for IL-3 signaling is composed of at least two subunits, an IL-3 specific alpha chain which binds IL-3 with low affinity and a common beta chain that is shared by the IL-5 and GM-CSF high-affinity receptors. Although the beta chain itself does not bind IL-3, it confers high-affinity IL-3 binding in the presence of the  alpha chain. Receptors for IL-3 are present on bone marrow progenitors, macrophages, mast cells, eosinophils, megakaryocytes, basophils and various myeloid leukemic cells.

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Publications for IL-3 (203-IL)(139)

We have publications tested in 6 confirmed species: Human, Mouse, Porcine, Primate - Macaca fascicularis (Crab-eating Monkey or Cynomolgus Macaque), Primate - Macaca mulatta (Rhesus Macaque), Xenograft.

We have publications tested in 4 applications: Bioassay, Cell Culture, Differentiation, In Vivo.

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Primate - Macaca fascicularis (Crab-eating Monkey or Cynomolgus Macaque)
Primate - Macaca mulatta (Rhesus Macaque)
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Showing Publications 1 - 10 of 139. Show All 139 Publications.
Publications using 203-IL Applications Species
J Grajcarek, J Monlong, Y Nishinaka-, M Nakamura, M Nagai, S Matsuo, D Lougheed, H Sakurai, MK Saito, G Bourque, K Woltjen Genome-wide microhomologies enable precise template-free editing of biologically relevant deletion mutations Nat Commun, 2019;10(1):4856. 2019 [PMID: 31649251] (Bioassay, Human) Bioassay Human
WR Proto, SV Siegel, S Dankwa, W Liu, A Kemp, S Marsden, ZA Zenonos, S Unwin, PM Sharp, GJ Wright, BH Hahn, MT Duraisingh, JC Rayner Adaptation of Plasmodium falciparum to humans involved the loss of an ape-specific erythrocyte invasion ligand Nat Commun, 2019;10(1):4512. 2019 [PMID: 31586047] (Cell Culture, Human) Cell Culture Human
N Uchida, MM Hsieh, L Raines, JJ Haro-Mora, S Demirci, AC Bonifacino, AE Krouse, ME Metzger, RE Donahue, JF Tisdale Development of a forward-oriented therapeutic lentiviral vector for hemoglobin disorders Nat Commun, 2019;10(1):4479. 2019 [PMID: 31578323] (Cell Culture, Human) Cell Culture Human
M Ly, S Rentas, A Vujovic, N Wong, S Moreira, J Xu, N Holzapfel, S Bhatia, D Tran, MD Minden, JS Draper, KJ Hope Diminished AHR signaling drives human acute myeloid leukemia stem cell maintenance Cancer Res., 2019;0(0):. 2019 [PMID: 31519687] (Bioassay, Human) Bioassay Human
MD McKenzie, M Ghisi, EP Oxley, S Ngo, L Cimmino, C Esnault, R Liu, JM Salmon, CC Bell, N Ahmed, M Erlichster, MT Witkowski, GJ Liu, M Chopin, A Dakic, E Simankowic, G Pomilio, T Vu, P Krsmanovic, S Su, L Tian, TM Baldwin, DA Zalcenstei, L DiRago, S Wang, D Metcalf, RW Johnstone, BA Croker, GI Lancaster, AJ Murphy, SH Naik, SL Nutt, V Pospisil, T Schroeder, M Wall, MA Dawson, AH Wei, H de Thé, ME Ritchie, J Zuber, RA Dickins Interconversion between Tumorigenic and Differentiated States in Acute Myeloid Leukemia Cell Stem Cell, 2019;25(2):258-272.e9. 2019 [PMID: 31374198] (Cell Culture, Human) Cell Culture Human
M Nasri, M Ritter, P Mir, B Dannenmann, N Aghaallaei, D Amend, V Makaryan, Y Xu, B Fletcher, R Bernhard, I Steiert, K Hahnel, J Berger, I Koch, B Sailer, K Hipp, C Zeidler, M Klimiankou, B Bajoghli, DC Dale, K Welte, J Skokowa CRISPR/Cas9 mediated ELANE knockout enables neutrophilic maturation of primary hematopoietic stem and progenitor cells and induced pluripotent stem cells of severe congenital neutropenia patients Haematologica, 2019;0(0):. 2019 [PMID: 31248972] (Bioassay, Human) Bioassay Human
M Ruiz-Gutie, ÖV Bölükba??, G Alexe, AG Kotini, K Ballotti, CE Joyce, DW Russell, K Stegmaier, K Myers, CD Novina, EP Papapetrou, A Shimamura Therapeutic discovery for marrow failure with MDS predisposition using pluripotent stem cells JCI Insight, 2019;5(0):. 2019 [PMID: 31039138] (Cell Culture, Human) Cell Culture Human
K Trakarnsan, D Ferguson, DE Daniels, RE Griffiths, MC Wilson, KE Mordue, A Gartner, TN Andrienko, A Calvert, A Condie, A McCahill, JC Mountford, AM Toye, DJ Anstee, J Frayne Vimentin expression is retained in erythroid cells differentiated from human iPSC and ESC and indicates dysregulation in these cells early in differentiation Stem Cell Res Ther, 2019;10(1):130. 2019 [PMID: 31036072] (Bioassay, Human) Bioassay Human
B Mair, J Tomic, SN Masud, P Tonge, A Weiss, M Usaj, AHY Tong, JJ Kwan, KR Brown, E Titus, M Atkins, KSK Chan, L Munsie, A Habsid, H Han, M Kennedy, B Cohen, G Keller, J Moffat Essential Gene Profiles for Human Pluripotent Stem Cells Identify Uncharacterized Genes and Substrate Dependencies Cell Rep, 2019;27(2):599-615.e12. 2019 [PMID: 30970261] (Differentiation, Human) Differentiation Human
AK Seneviratn, M Xu, JJA Henao, VA Fajardo, Z Hao, V Voisin, GW Xu, R Hurren, S Kim, N MacLean, X Wang, M Gronda, D Jeyaraju, Y Jitkova, T Ketela, M Mullokando, D Sharon, G Thomas, R Chouinard-, JR Hawley, C Schafer, HL Yau, Z Khuchua, A Aman, R Al-Awar, A Gross, SM Claypool, R Bazinet, M Lupien, S Chan, DD De Carvalh, MD Minden, GD Bader, KD Stark, P LeBlanc, AD Schimmer The Mitochondrial Transacylase, Tafazzin, Regulates for AML Stemness by Modulating Intracellular Levels of Phospholipids Cell Stem Cell, 2019;0(0):. 2019 [PMID: 30930145] (Bioassay, Human) Bioassay Human
Show All 139 Publications.

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