Related Experiment Videos
LKB1 (XEEK1) regulates Wnt signalling in vertebrate development
Olga Ossipova1, Nabeel Bardeesy, Ronald A DePinho
1Department of Cancer Biology, Dana Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.
Nature Cell Biology
|September 16, 2003
Summary
LKB1 (also known as STK11) is crucial for vertebrate development. This study reveals LKB1/XEEK1 is essential for Wnt-beta-catenin signaling, impacting embryonic patterning and potentially preventing cancer.
Area of Science:
- Developmental Biology
- Molecular Biology
- Cancer Biology
Background:
- Germline LKB1/STK11 mutations cause Peutz-Jeghers syndrome (PJS), a cancer predisposition.
- LKB1 nullizygosity in mice results in developmental abnormalities.
- The precise role of LKB1 in vertebrate development remains unclear.
Purpose of the Study:
- To investigate the function of LKB1 in embryonic development using Xenopus.
- To elucidate the relationship between LKB1 and Wnt signaling pathways.
Main Methods:
- Inhibition of XEEK1 (Xenopus LKB1 orthologue) in developing Xenopus embryos.
- Analysis of developmental anomalies, including body axis formation and patterning.
- Investigation of Wnt-beta-catenin signaling pathway components and gene expression in Xenopus and mammalian cells.
Main Results:
- XEEK1 inhibition caused developmental defects, such as shortened body axis and altered dorsoanterior patterning.
- LKB1/XEEK1 was found to cooperate with Wnt-beta-catenin signaling in axis induction.
- LKB1/XEEK1 modulates Wnt-responsive gene expression and acts upstream of beta-catenin.
- LKB1/XEEK1 regulates GSK3beta phosphorylation and associates with GSK3beta and PKC-zeta.
Conclusions:
- LKB1/XEEK1 is essential for Wnt-beta-catenin signaling in both Xenopus and mammals.
- This study provides new insights into LKB1's role in vertebrate developmental patterning.
- Understanding LKB1's function may offer novel perspectives on carcinogenesis.