LEGEND MAX™ Free Active TGF-β1 ELISA Kit

Pricing & Availability
Regulatory Status
Other Names
Free Active TGF-β1 Pre-coated ELISA Kit
Ave. Rating
Submit a Review
Product Citations
  • TGF-b1_020711
Cat # Size Price Quantity Check Availability Save
437707 1 Pre-coated Plate 398€
Check Availability

Need larger quantities of this item?
Request Bulk Quote

Transforming growth factor beta 1 (TGF-β1) is a member of the transforming growth factor beta superfamily of cytokines. TGF-β1 precursor contains 390 amino acids with an N-terminal signal peptide of 29 amino acids required for secretion from a cell, a 249 amino acids pro-region (latency associated peptide or LAP), and a 112 amino acids C-terminal region that becomes the active TGF-β1 upon activation.

Both LAP and TGF-β1 exist as homodimers in circulation, but the disulfide linked homodimers of LAP and TGF-β1 remain non-covalently associated, forming the small latent TGF-β1 complex (SLC, 100 kD).  The large latent TGF-β1 Complex (LLC, 235 - 260 kD) contains a third component, the latent TGF-β binding protein (LTBP), which is linked to LAP by a single disulfide bond.  The LTBP does not confer latency, but for efficient secretion of the complex to extracellular sites.  Free active TGF-β1 can be released (activated) by many factors including enzymes and low or high pH.

TGF-β1 is nearly 100% conserved across mammalian species. It has diverse biological functions in multiple cellular processes such as regulating proliferation and differentiation of various cell types. TGF-β1 is also an important immunoregulatory cytokine, which is involved in the maintenance of self-tolerance, Th17 differentiation, and T cell homeostasis, etc.

It is expected that normal serum, plasma, or other biological fluid contains low concentration of free active TGF-β1 and high concentration of Latent TGF-β1. It is the free active form TGF-β1 that binds TGF-β receptor and exerts biological functions. However, it has been difficult to quantify the free active TGF-β1 because of insufficient sensitivities of most assay products currently available on the market. It is necessary to measure both the free active form and total TGF-β1 in biological samples to understand the TGF-β1 functions.

Product Details
Technical Data Sheet (pdf)

Kit Contents

Kit Contents
  • Anti-TGF-β1 Pre-coated 96-well Strip microplate
  • TGF-β1 Detection Antibody
  • TGF-β1 Standard
  • Avidin-HRP D
  • Assay Buffer C
  • Wash Buffer (20X)
  • Substrate Solution F
  • Stop Solution
  • Plate Sealers

Product Details

Verified Reactivity
Human, Mouse, Rat
Reported Reactivity
Other species


Additional Product Notes

View more applications data for this product in our Scientific Poster Library.

Application References

(PubMed link indicates BioLegend citation)
  1. Tucker, TA., et al. 2011. Am J. Respir Cell Mol Biol. 46:173. PubMed
  2. Andreade BB, et al. 2013. J Infect Dis. 207:1379. PubMed
  3. Wen L, et al. 2014. PLoS One. 9:101841. PubMed
  4. Kemter AM, et al. 2015. Life Sci. 15:129. PubMed
Product Citations
  1. Xu M, et al. 2018. Am J Transplant. 18:855. PubMed
  2. Kemter A, et al. 2015. Life Sci. 15:129. PubMed
  3. Lawson J, et al. 2016. Vet J. 214:1-6. PubMed
  4. Takeshima T, et al. 2016. Proc Natl Acad Sci U S A. 113: 11300 - 11305. PubMed
  5. Kupani M, et al. 2021. Front Cell Infect Microbiol. 614165:10. PubMed
  6. Lefebvre J, et al. 2016. Sci Rep. 6: 25051. PubMed
  7. McInerney-Leo A, et al. 2016. J Med Genet. 53: 457 - 464. PubMed
  8. Andrade B, et al. 2013. J Infect Dis. 207:1379. PubMed
  9. Díaz-García E, et al. 2021. Cancers (Basel). 13:. PubMed
  10. Li Y, et al. 2021. Sci Transl Med. 13:. PubMed
  11. Smith C, et al. 2015. Cell Rep. 13:1137-48. PubMed
  12. Wen L, et al. 2014. PLoS One. 9:101841. PubMed
  13. Tucker T, et al. 2012. Am J Respir Cell Mol Biol. 118:2784. PubMed
  14. Tang R, et al. 2020. Exp Ther Med. 3.388194444. PubMed
  15. Popek M, et al. 2022. Int J Mol Sci. 23:. PubMed
2.3 pg/mL
Standard Range
7.8-500 pg/mL
Materials Not Included
  • Microplate reader able to measure absorbance at 450 nm
  • Adjustable pipettes to measure volumes ranging from 1 µL to 1,000 µL
  • Deionized water
  • Wash bottle or automated microplate washer
  • Log-Log graph paper or software for data analysis
  • Tubes to prepare standard dilutions
  • Timer
  • Plate Shaker
  • Polypropylene vials

Antigen Details

Cell Sources
Many cell types, highly expressed on activated Tregs and platelets
Biology Area
Apoptosis/Tumor Suppressors/Cell Death, Cell Biology, Immunology, Neuroinflammation, Neuroscience, Signal Transduction
Molecular Family
Cytokines/Chemokines, Growth Factors
Gene ID
21803 View all products for this Gene ID
View information about TGF-beta1 on UniProt.org

Related FAQs

In your LEGEND MAX™ ELISA Kits, there is a step that calls for washing the plates before adding sample. What is the purpose of this step?

We typically use a stabilizer for pre-coated plates. The additional washing step is designed to remove these components before you start the assay. If you do not perform the washing, the effect on assay performance is negligible.

I have multiple LEGEND MAX™ ELISA kits that I want to run simultaneously. Can I use the same wash buffer for all the kits?

The wash buffer provided in all our LEGEND MAX™ kits is the same and the part numbers on the wash buffer bottles in these kits should be identical. For ELISA MAX™ Deluxe and ELISA MAX™ Standard Sets, we provide a recipe for the wash buffer on each kit’s technical data sheet. This recipe is the same for all ELISA MAX™ sets.

For some of your ELISA kits, why do my serum samples require dilution with assay buffer?

In some cases, dilution with assay buffer is required to minimize the matrix difference between the samples and the standards to achieve better accuracy.

Go To Top Version: 4    Revision Date: 09/19/2023

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.


BioLegend, the BioLegend logo, and all other trademarks are property of BioLegend, Inc. or their respective owners, and all rights are reserved.


8999 BioLegend Way, San Diego, CA 92121 www.biolegend.com
Toll-Free Phone: 1-877-Bio-Legend (246-5343) Phone: (858) 768-5800 Fax: (877) 455-9587


Login / Register
Remember me
Forgot your password? Reset password?
Create an Account