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Secreted Frizzled-related proteins (sFRPs) are modulators of the Wnt signaling pathway that plays important roles in both embryogenesis and oncogenesis. sFRPs have been proposed to antagonize Wnt activity by binding to Wnts. However, the affinity of this binding is unknown. Here we show, using surface plasmon resonance and purified proteins, that sFRP1, sFRP2, sFRP4, and Frzb bind directly to Wnt3a with affinities in the nanomolar range. However, only sFRP1 and sFRP2 antagonize Wnt3a activity by blocking Wnt3a induced beta-catenin accumulation in L cells. Furthermore, sFRP2, but not Frzb, antagonizes Wnt3a signaling in an ES cell model of mesoderm differentiation. These results provide the first measurement of binding affinity of sFRPs for a Wnt, which together with the measurement of antagonistic activity of sFRPs could help understand how sFRPs regulate Wnt signaling.
Pubmed ID: 17462603 RIS Download
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Database for primer and probe sequences used in real-time PCR assays employing popular chemistries (SYBR Green I, Taqman, Hybridization Probes, Molecular Beacon) to prevent time-consuming primer design and experimental optimization, and to introduce a certain level of uniformity and standardization among different laboratories. Researchers are encouraged to submit their validated primer and probe sequence, so that other users can benefit from their expertise. The database can be queried using the official gene name or symbol, Entrez or Ensembl Gene identifier, SNP identifier, or oligonucleotide sequence. Different options make it possible to restrict a query to a particular application (Gene Expression Quantification/Detection, DNA Copy Number Quantification/Detection, SNP Detection, Mutation Analysis, Fusion Gene Quantification/Detection, Chromatin immunoprecipitation (ChIP)), organism (Human, Mouse, Rat, and others) or detection chemistry.
View all literature mentionsAnalysis software for life science data. This software package is for presentation and evaluation of sensorgram data from real-time BIA analyses.
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