Recombinant Human CD14 (carrier-free)

Pricing & Availability
Regulatory Status
RUO
Other Names
Human monocyte differentiation antigen CD14, Myeloid cell-specific leucine-rich glycoprotein
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Product Citations
publications
CD14_Human_Recombinant_Protein_011614
IL-8 induction on THP-1 cells stimulated with LPS+ CD14.
  • CD14_Human_Recombinant_Protein_011614
    IL-8 induction on THP-1 cells stimulated with LPS+ CD14.
Cat # Size Price Save
593002 10 µg ¥17,720
593004 25 µg ¥30,450
593006 100 µg ¥69,060

Select size of product is eligible for a 40% discount! Promotion valid until December 31, 2024. Exclusions apply. To view full promotion terms and conditions or to contact your local BioLegend representative to receive a quote, visit our webpage.

Description

CD14 is a pattern recognition receptor important in innate immunity. CD14 exists in two forms, as a glycosylphosphatidylinositol-anchored protein on the surface of mononuclear cells and as a soluble protein in the blood. CD14 is shed from the surface of CD14-expressing cells, resulting in the soluble CD14 protein (sCD14). CD14 is down regulated from the cell membrane on stimulated monocytes by different factors such as LPS, IFNγ, PMA, calcium ionophore A 23187, and antibodies against CD14. CD14 can be released from the cells with GPI-phospholipase C and D (PLC/D). Membrane associated CD14 is a pro-inflammatory coreceptor for LPS, a characteristic constituent of the cell wall of Gram-negative bacteria. LPS interacts with LPS-binding protein (LBP) and CD14, and this complex interacts with TLR4, which subsequently induces inflammatory gene expression through NF-κB and mitogen-activated protein-kinase signaling in host cells. sCD14 enables responses to LPS by cells that do not express CD14 such as endothelial cells. In this sense, HUVEC cells respond to LPS by production of IL-6 and this responsiveness is serum dependent.  Elevated levels of sCD14 has been detected in serum of patients with different diseases such as systemic lupus erythematosus, HIV infected patients, common variable immunodeficiency (CVID), and nonalcoholic fatty liver disease (NAFLD). Also, high levels of sCD14 has been associated with infectious diseases, including sepsis. In addition, it has been reported that sCD14 could be a potential biomarker for predicting the prognosis of breast invasive ductal carcinoma.

Product Details
Technical data sheet

Product Details

Source
Human CD14, amino acids (Thr20-Cys352) (Accession# NM_000591 ) was expressed in CHO cells.
Molecular Mass
The 333 amino acid recombinant protein has a predicted molecular mass of approximately 35.8 kD. The DTT-reduced and non-reduced glycosylated protein migrate at approximately 50-60 kD and 40-55 kD respectively by SDS-PAGE. The N-terminal amino acid is Thr.
Purity
>95% glycosylated, as determined by Coomassie stained SDS-PAGE.
Formulation
0.22 µm filtered protein solution is 1X PBS, pH 7.2.
Endotoxin Level
Less than 0.01 ng per µg cytokine as determined by the LAL method.
Concentration
10 and 25 µg sizes are bottled at 200 µg/mL. 100 µg size and larger sizes are lot-specific and bottled at the concentration indicated on the vial. To obtain lot-specific concentration and expiration, please enter the lot number in our Certificate of Analysis online tool.
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.
Activity
ED50 = 100-400 ng/ml, corresponding to a specific activity of 1.0-2.5 x 104 units/mg, as determined by production of IL-8 from THP-1 cells trated with LPS (2 ng/ml) and CD14.
Application

Bioassay

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 tech@biolegend.com.

Product Citations
  1. Feng Y, et al. 2022. Ther Adv Med Oncol. 14:17588359221131532. PubMed

Antigen Details

Distribution
Activated monocytes are a source of sCD14. It is present in plasma, colostrum, and milk.
Function
CD14 enhances innate immune responses to infections, and it sensitizes cells to bacterial LPS. sCD14 induces B cell growth and differentiation. It enables responsivesness to LPS by non CD14-expressing cells. LPS, IFNγ, PMA, calcium ionophore A 23187, and antibodies against CD14 induce sCD14.
Interaction
B cells, endothelial cells
Ligand/Receptor
LBP, TLR2, TLR4
Biology Area
Immunology, Innate Immunity
Molecular Family
Soluble Receptors, CD Molecules
Antigen References

1. Simmons DL, et al. 1989. Blood 73:284.
2. Wright SD, et al. 1990. Sciences 249:1431.
3. Bazil V and Strominger JL. 1991. J. Immunol. 147:1567.
4. Frey EA, et al. 1992. J. Exp. Med. 176:1665.
5. Matsuguchi T, et al. 2000. J. Immunol. 165:5767.
6. Bochkov VN, et al. 2002. Nature 419:77.
7. Zanin-Zhorov A, et al. 2007. J. Immunol. 179:41.
8. Baumann CL, et al. 2010. J. Exp. Med. 207:2689.
9. Litzman J, et al. 2012. Clin. Exp. Immunol. 170:321.

Gene ID
929 View all products for this Gene ID
UniProt
View information about CD14 on UniProt.org

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: 1    Revision Date: 01/16/2014

For Research Use Only. Not for diagnostic or therapeutic use.

 

This product is supplied subject to the terms and conditions, including the limited license, located at www.biolegend.com/terms) ("Terms") and may be used only as provided in the Terms. Without limiting the foregoing, BioLegend products may not be used for any Commercial Purpose as defined in the Terms, resold in any form, used in manufacturing, or reverse engineered, sequenced, or otherwise studied or used to learn its design or composition without express written approval of BioLegend. Regardless of the information given in this document, user is solely responsible for determining any license requirements necessary for user’s intended use and assumes all risk and liability arising from use of the product. BioLegend is not responsible for patent infringement or any other risks or liabilities whatsoever resulting from the use of its products.

 

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