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Published on: December 14, 2015
Head inducer Dickkopf-1 is a ligand for Wnt coreceptor LRP6
M V Semënov1, K Tamai, B K Brott
1Division of Neuroscience, Children's Hospital, Department of Neurology, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA.
Current Biology : CB
|July 13, 2001
Summary
Dickkopf-1 (Dkk-1) inhibits Wnt signaling by binding to LRP6, preventing Frizzled (Fz)-LRP6 complex formation. This reveals a novel mechanism for Wnt/beta-catenin pathway modulation.
Area of Science:
- Developmental Biology
- Molecular Signaling
- Cell Biology
Background:
- Dickkopf-1 (Dkk-1) is a secreted protein crucial for vertebrate head development.
- Dkk-1 antagonizes Wnt signaling, a pathway involved in numerous biological processes.
- The precise molecular mechanism by which Dkk-1 inhibits Wnt signaling was previously unknown.
Purpose of the Study:
- To elucidate the molecular mechanism of Dickkopf-1 (Dkk-1) action in Wnt signaling.
- To determine how Dkk-1 inhibits Wnt-induced anterior development.
- To investigate the role of LRP6 in Wnt pathway activation and Dkk-1 inhibition.
Main Methods:
- Investigated the interaction of Dkk-1 with Wnt pathway components.
- Assessed the effect of Dkk-1 on Wnt-Frizzled (Fz) and Fz-LRP6 complex formation.
- Correlated Dkk-1 binding to LRP6 with its inhibitory function in Wnt signaling.
Main Results:
- Dkk-1 acts as a high-affinity ligand for LRP6, a Wnt signaling coreceptor.
- Dkk-1 inhibits Wnt signaling by preventing the formation of Wnt-induced Fz-LRP6 complexes.
- Dkk-1 does not bind Wnt or Fz, nor does it interfere with Wnt-Fz interactions.
Conclusions:
- Dkk-1 inhibits Wnt signaling by blocking Wnt-induced Fz-LRP6 complex formation, revealing a novel modulation mechanism.
- LRP6 functions as a Wnt coreceptor specifying signaling to the beta-catenin pathway.
- Dkk-1 is a specific inhibitor of Wnt/beta-catenin signaling, distinct from Wnt-binding antagonists.
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