Recombinant Human Thrombopoietin (TPO) (Animal-Free)

Pricing & Availability
Regulatory Status
Other Names
Megakaryocyte Colony Stimulating Factor (MKCSF), Myeloproliferative leukemia virus oncogene ligand (Mpl-ligand), Megakaryocyte growth and development factor (MGDF), THPO
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Product Citations
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712602 10 µg $253
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TPO is a key regulator of megakaryocytopoiesis and thrombopoiesis. It signals through the c-mpl receptor and stimulates the proliferation and maturation of megakaryocytes; hence, TPO plays an important role in regulating the level of circulating platelets in vivo. It has also been shown that TPO is able to promote the survival, self-renewal, and expansion of hematopoietic stem cells and primitive multilineage progenitors. Besides its hematopoietic effects, TPO is expressed in the brain where it promotes apoptosis of hypoxia sensitized neurons and inhibits neuronal differentiation by blocking NGF-induced signaling.     

Product Details
Technical data sheet

Product Details

Human TPO, amino acids Ser22-Leu195 (Accession# AAA50553.1), was expressed in E. coli.
Molecular Mass
The 174 amino acid recombinant protein has a predicted molecular mass of approximately 18.6 kD. The predicted N-terminal amino acid is Ser.
>98%, as determined by Coomassie stained SDS-PAGE and HPLC analysis.
Lyophilized, carrier-free.
Endotoxin Level
Less than 0.1 ng per µg of protein.
Storage & Handling
Unopened vial can be stored at -20°C or -70°C. For maximum results, quick spin vial prior to opening. Reconstitute in water to a concentration of 0.1-1.0 mg/ml. Do not vortex. It is recommended to further dilute in a buffer, such as 5% Trehalose, and store working aliquots at -20°C to -80°C. Avoid repeated freeze/thaw cycles.
The ED50 as determined by the dose-dependent stimulation of the proliferation of human MO7e cells was found to be ≤ 1.0 ng/ml, corresponding to a specific activity of ≥ 1.0 x 106 units/mg.


Antigen Details


TPO is produced by liver and kidney.

TPO regulates megakaryocytopoiesis and thrombopoiesis.
Cell Type
Mesenchymal Stem Cells, Hematopoietic stem and progenitors, Embryonic Stem Cells
Biology Area
Apoptosis/Tumor Suppressors/Cell Death, Cell Biology, Stem Cells
Molecular Family
Growth Factors, Cytokines/Chemokines
Antigen References

1. Avanzi G. et al. 1988. Br. J. Haematol. 69:359.
2. Deutsch V.R. and Tomer A. 2006. Br. J. Haematol. 134:453.
3. Kaushansky K. 2005. J. Clin. Invest. 115:3339.
4. Li J. et al. 1999. Br. J. Haematol. 106:345.
5. Kato T. et al. 1997. Proc. Natl. Acad. Sci. USA 94:4669.
6. Ehrenreich H. et al. 2005. Proc. Natl. Acad. Sci. USA 102:862.

Gene ID
7066 View all products for this Gene ID
View information about Thrombopoietin on

Related FAQs

Why choose BioLegend recombinant proteins?

     • Each lot of product is quality-tested for bioactivity as indicated on the data sheet.
     • Greater than 95% Purity or higher, tested on every lot of product.
     • 100% Satisfaction Guarantee for quality performance, stability, and consistency.
     • Ready-to-use liquid format saves time and reduces challenges associated with reconstitution.
     • Bulk and customization available. Contact us.
     • Learn more about our Recombinant Proteins.

How does the activity of your recombinant proteins compare to competitors?

We quality control each and every lot of recombinant protein. Not only do we check its bioactivity, but we also compare it against other commercially available recombinant proteins. We make sure each recombinant protein’s activity is at least as good as or better than the competition’s. In order to provide you with the best possible product, we ensure that our testing process is rigorous and thorough. If you’re curious and eager to make the switch to BioLegend recombinants, contact your sales representative today!

What is the specific activity or ED50 of my recombinant protein?

The specific activity range of the protein is indicated on the product datasheets. Because the exact activity values on a per unit basis can largely fluctuate depending on a number of factors, including the nature of the assay, cell density, age of cells/passage number, culture media used, and end user technique, the specific activity is best defined as a range and we guarantee the specific activity of all our lots will be within the range indicated on the datasheet. Please note this only applies to recombinants labeled for use in bioassays. ELISA standard recombinant proteins are not recommended for bioassay usage as they are not tested for these applications.

Have your recombinants been tested for stability?

Our testing shows that the recombinant proteins are able to withstand room temperature for a week without losing activity. In addition the recombinant proteins were also found to withstand four cycles of freeze and thaw without losing activity.

Does specific activity of a recombinant protein vary between lots?

Specific activity will vary for each lot and for the type of experiment that is done to validate it, but all passed lots will have activity within the established ED50 range for the product and we guarantee that our products will have lot-to-lot consistency. Please conduct an experiment-specific validation to find the optimal ED50 for your system.

How do you convert activity as an ED50 in ng/ml to a specific activity in Units/mg?

Use formula Specific activity (Units/mg) = 10^6/ ED50 (ng/mL)

Go To Top Version: 3    Revision Date: 05/06/2014

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*These products may be covered by one or more Limited Use Label Licenses (see the BioLegend Catalog or our website, BioLegend products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products, reverse engineer functionally similar materials, or to provide a service to third parties without written approval of BioLegend. By use of these products you accept the terms and conditions of all applicable Limited Use Label Licenses. Unless otherwise indicated, these products are for research use only and are not intended for human or animal diagnostic, therapeutic or commercial use.


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