- Other Names
- Thymus and activation-regulated chemokine (TARC), Small-inducible cytokine 17 (SCYA17)
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- Product Citations
CCL17 was initially isolated from phytohemagglutinin-stimulated PBMC. CCL17 is constitutively expressed in the thymus and, under activation, in several cell types. CCL17-mediated recruitment of Th2 cells and CLA+ CD4+ T cells plays a key role in allergic diseases like atopic dermatitis, allergic asthma, allergic rhinitis, and allergic contact dermatitis. In addition, CCL17 has been detected in idiopathic pulmonary fibrosis. Also, CCL17 and CCL22 secreted by DC seem to mediate the recruitment of regulatory T cells to sites of inflammation in patients with chronic hepatitis. CCL17 is upregulated by several combinations of cytokines: TNFα, IL-4, and IFNγ in bronchial epithelial cells; TGFβ1, TNFα, and IFNγ in human keratinocyte cell lines; and histamine and prostaglandin E2P in immature DC.Product Details
- Human CCL17, amino acids Ala24-Ser94 (Accession# Q92583.1) was expressed in E. coli.
- Molecular Mass
- The 71 amino acid recombinant protein has a predicted molecular mass of approximately 8 kD. The DTT-reduced protein migrates at approximately 10 kD and non-reduced protein migrates at approximately 11 kD by SDS-PAGE. The N-terminal amino acid is Ala.
- >98%, as determined by Coomassie stained SDS-PAGE.
- 0.22 µm filtered protein solution is in PBS.
- Endotoxin Level
- Less than 0.01 ng per µg cytokine as determined by the LAL method.
- 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 (please contact technical support for concentration, or use our Lookup tool if you have a lot number.) Please note, new lots of the 100 µg size will be lot-specific and may differ from previous lots that had a fixed concentration.
- 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.
- Bioactivity was measured by its property to chemoattract Baf3-hCCR4 transfectants in a dose dependent manner. 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 validated 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 firstname.lastname@example.org.
- Upon activation, CCL17 is expressed by PBMC, monocytes, dendritic cells, bronchial epithelial cells, smooth muscle cells, keratinocytes, and fibroblasts.
- CCL17 chemoattracts T cells, Th2 cells, and CLA+ CD4+ T cells and plays major role in allergic diseases. CCL17 can be upregulated by IL-4 in T cells and by a combination of cytokines in different cells.
- T cells, Th2 cells, CLA+ CD4 T cells, T (reg) cells, NK cells, NKT cells, and macrophages.
- Biology Area
- Cell Biology, Signal Transduction
- Molecular Family
- Antigen References
1. Imai T, et al. 1997. J. Biol. Chem. 272:15036.
2. McIlroy A, et al. 2006. Immunology 117:507.
3. Yogo Y, et al. 2009. Respir. Res. 10:80.
4. Stutte S, et al. 2010. P. Natl. Acad. Sci. USA 107:8736.
5. Oo YH, et al. 2010. J. Immunol. 184:2886.
- Gene ID
- 6361 View all products for this Gene ID
- View information about CCL17 on UniProt.org
- 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.
- 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.
- 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)
- 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.