Recombinant Human Placental Lactogen/CSH1 (carrier-free)

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Regulatory Status
Other Names
Chorionic Somatomammotropin Hormone 1 (CSH1), Chorionic Somatomammotropin A (CS-A), Growth Hormone B3 (GHB3), Lactogen, PL
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Product Citations
Human recombinant Placental lactogen induces the proliferation of rat Nb2-11 cells in a dose dependent manner.
  • Human_Placental-Lactogen_CF_1_072318
    Human recombinant Placental lactogen induces the proliferation of rat Nb2-11 cells in a dose dependent manner.
  • Human_Placental-Lactogen_CF_2_072318
    Stability testing for human Placental lactogen. PL was aliquoted in PBS at 0.2 mg/ml and one aliquot was kept at 4°C (control) and another was freeze-thawed four times (4 x freeze-thaws). After this procedure, the samples were tested by induction of proliferation of rat Nb2-11 cells.
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774008 500 µg 1313€
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774002 10 µg 90€
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774004 25 µg 249€
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774006 100 µg 484€
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Placental lactogen (PL) belongs to the prolactin family that includes growth hormone (GH), prolactin (PRL), and PL. Placental lactogen and GH share 85% identity at the amino acid level, in contrast human PRL has approximately 25% similarity with PL and GH; nevertheless, PL has very low affinity for the GH receptor, while all three human proteins bind with high affinity to the PRL receptor. PL is located on chromosome 17q22-24, GH/CSH locus, this locus participates in the regulation of postnatal and intrauterine growth. It contains five highly homologous genes: GH1, and four placenta-expressed paralogs (CSHL1CSH1GH2CSH2). PL is encoded by CSH1 and CSH2 genes (chorionic somatomammotropin hormone 1 and 2). PL is produced only during pregnancy and it is a key factor for the mass increase of pancreatic islets, through pregnancy, as well as the improvement of their function. Human PL inhibits apoptosis human pancreatic islets and insulinoma cell lines by activation of signaling pathways, phosphorylation of AKT protein; also, PL improves insulin secretion in human pancreatic islets.

Product Details
Technical Data Sheet (pdf)

Product Details

Human Placental lactogen amino acids (Val27-Phe217) (Accession # PODML2) was expressed in 293Ecells.The carboxy terminus contains 8His-GGQ tag.
Molecular Mass
The 204 amino acid recombinant protein has a predicted molecular mass of approximately 23.8 kD. The DTT-reduced and non-reduced protein migrate at approximately 25 kD and 20 kD respectively by SDS-PAGE. The predicted N-terminal amino acid is Val.
> 95% by SDS-PAGE gel as determined by Coomassie stained SDS-PAGE.
0.22 µm filtered protein solution is in PBS pH 7.2.
Endotoxin Level
Less than 0.1 EU per µg cytokine as determined by the LAL method.
10 and 25 µg sizes are bottled at 200 µg/mL. 100 µg and larger sizes are lot-specific and bottled at the concentration indicated on the vial. To obtain lot-specific concentration, please enter the lot number in our Concentration and Expiration Lookup or Certificate of Analysis online tools.
Storage & Handling
Unopened vial can be stored between 2°C and 8°C for up to 2 weeks, at -20°C for up to six months, or at -70°C or colder until the expiration date. For maximum results, quick spin vial prior to opening. The protein can be aliquoted and stored at -20°C or colder. Stock solutions can also be prepared at 50 - 100 µg/mL in appropriate sterile buffer, carrier protein such as 0.2 - 1% BSA or HSA can be added when preparing the stock solution. Aliquots can be stored between 2°C and 8°C for up to one week and stored at -20°C or colder for up to 3 months. Avoid repeated freeze/thaw cycles.
Human recombinant Placental lactogen induces the proliferation of rat Nb2-11 cells in a dose dependent manner. The ED50 = 0.2 – 1.2 ng/mL.


Application Notes

BioLegend carrier-free recombinant proteins provided in liquid format are shipped on blue-ice. Our comparison testing data indicates that when handled and stored as recommended, the liquid format has equal or better stability and shelf-life compared to commercially available lyophilized proteins after reconstitution. Our liquid proteins are verified in-house to maintain activity after shipping on blue ice and are backed by our 100% satisfaction guarantee. If you have any concerns, contact us at

Antigen Details


Placenta, syncytiotrophoblast, plasma during pregnancy.

Regulation of intrauterine growth, improves pancreatic islet function and mass increase. Activated macrophages might regulate extracellular levels of PL.
Human pancreatic islets, insulinoma cell lines, hepatocytes.
Prolactin Receptor, GHR
Induces rat NB2-11 cell proliferation.
Molecular Family
Enzymes and Regulators
Antigen References
  1. Kzhyshkowska J, et al. 2008. J Immunol. 180:3028.
  2. Männik J, et al. 2010. J Clin Endocrinol Metab. 95:2433.
  3. Lombardo MF, et al. 2011. Islets. 3:250.
  4. Gonzalez C, et al. 2015. Acta Pharmacol Sin. 36:572.
  5. Goyvaerts L, et al. 2015. PLoS One. 10(3):e0121868.
Gene ID
1442 View all products for this Gene ID
View information about Placental Lactogen 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) = 10e6/ ED50 (ng/mL)
Go To Top Version: 1    Revision Date: 07/24/2018

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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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