Recombinant Human Frizzled-8 Fc Chimera Protein, CF


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Product Details

Reactivity HuSpecies Glossary
Applications Bioactivity, GelChrom

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Recombinant Human Frizzled-8 Fc Chimera Protein, CF Summary

Details of Functionality
Measured by its ability to inhibit Wnt-3a-induced alkaline phosphatase production by MC3T3‑E1 mouse preosteoblast cells. The ED50 for this effect is 15-75 ng/mL in the presence of 10 ng/mL of Recombinant Mouse Wnt‑3a (Catalog # 1324-WN) Measured by its binding ability in a functional ELISA. In a 100 µL reaction mixture containing biotinylated recombinant mouse (rm) Wnt-3a or rmWnt-5a at 50-100 ng/mL and Recombinant Human (rh) Frizzled-8 Fc Chimera dilutions at 0.1-8,000 ng/mL, the concentration of rhFrizzled-8 Fc Chimera that produces 50% of the optimal binding response is found to be approximately 7-28 ng/mL.
Optimal concentrations should be determined by each laboratory for each application.
Chinese Hamster Ovary cell line, CHO-derived human Frizzled-8 protein
Human Frizzled-8
Accession # Q9H461
N-terminus C-terminus
Accession #
N-terminal Sequence
Ala25 & Ala28
Structure / Form
Disulfide-linked homodimer
Protein/Peptide Type
Recombinant Proteins
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Endotoxin Note
<0.10 EU per 1 μg of the protein by the LAL method.


  • Bioactivity
  • Gel Filtration Chromatography
Theoretical MW
43.3 kDa (monomer).
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
55-65 kDa, reducing conditions
Read Publications using
6129-FZ in the following applications:

Packaging, Storage & Formulations

Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
Lyophilized from a 0.2 μm filtered solution in PBS.
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Reconstitution Instructions
Reconstitute at 500 μg/mL in PBS.


This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant Human Frizzled-8 Fc Chimera Protein, CF

  • frizzled (Drosophila) homolog 8
  • frizzled 8
  • frizzled family receptor 8
  • frizzled homolog 8 (Drosophila)
  • Frizzled8
  • Frizzled-8
  • FZ-8
  • FZD8
  • hFZ8


Frizzled-8 is one of at least ten seven-transmembrane (7TM) glycoproteins of the Frizzled family of Wnt receptors (1-2). Frizzled proteins are thought to be G-protein-coupled (1). Wnt engagement, with low density lipoprotein receptor-related proteins LRP-5 or LRP-6 acting as co-receptors, stabilizes beta -catenin and promotes gene transcription that is important in development and tissue maintenance (1). Human Frizzled-8 cDNA encodes 694 amino acids (aa) including a 27 aa signal peptide, a 247 aa extracellular domain (ECD), the 7TM region (aa 276-605), and a C-terminal cytoplasmic domain with a PDZ binding motif (aa 606-694) (2). The ECD includes a cysteine-rich region (CRD, aa 30-151) that binds Wnts and is highly conserved among Frizzleds, and a linker region. Within aa 28-172, human Frizzled-8 shares 99%, 99%, 90% and 85% aa identity with mouse, rat, Xenopus and zebrafish Frizzled-8, respectively. It also shares 82% aa identity with human Frizzled-5. Frizzleds can form homodimers or selective hetero-oligomers with other family members, which can involve the TM regions and possibly the CRD (1, 3). During mouse development, Frizzled-8 is expressed in tissues that are important for organizing the anterior-posterior axis (4). Interactions of Frizzled-8 with several non-Wnt ligands have been identified. Interaction with Frizzled-8 and LRP-6 allows R-spondins to activate beta -catenin signaling pathways, while interaction with IGFBP-4 (insulin-like growth factor binding protein (4) or CTGF (connective tissue growth factor) inhibits Wnt signaling (5-7). These ligands bind the extracellular CRD of Frizzled-8, blocking Wnt binding. The recombinant Frizzled-8 CRD has also been used to block Wnt signaling and inhibit growth of teratocarcinomas (5-10).

  1. Schulte, G. and V. Bryja (2007) Trends Pharmacol. Sci. 28:518.
  2. Saitoh, T. et al. (2001) Int. J. Oncol. 18:991.
  3. Dann, C.E. et al. (2001) Nature 412:86.
  4. Lu C.C. et al. (2004) Gene Expr. Patterns 4:569.
  5. Nam, J-S. et al. (2006) J. Biol. Chem. 281:13247.
  6. Zhu, W. et al. (2008) Nature 454:345.
  7. Mercurio, S. et al. (2004) Development 131:2137.
  8. Chesnutt, C. et al. (2004) Dev. Biol. 274:334.
  9. Yamashita, J.K. et al. (2005) FASEB J. 19:1534.
  10. DeAlmeida, V.I. et al. (2007) Cancer Res. 67:5371.

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Publications for Frizzled-8 (6129-FZ)(4)

We have publications tested in 1 confirmed species: Human.

We have publications tested in 1 application: Bioassay.

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Gene Symbol FZD8