LKB1 tumor suppressor protein regulates actin filament assembly through Rho and its exchange factor Dbl independently of kinase activity
Open accessAbstract
Background: Germline mutations in LKB1 result in Peutz-Jeghers Syndrome characterized by intestinal hamartomas and increased incidence of epithelial cancers. LKB1 encodes a serine/threonine kinase that plays an important role in regulating energy metabolism through the AMPK/mTOR signaling pathway. In addition, LKB1 is homologous to PAR-4, a polarity protein first described in C. elegans, while activation of LKB1 in mammalian epithelial cells induces the polarized assembly of actin filaments. Results: To explore the mechanism by which LKB1 interacts with the actin cytoskeleton, we introduced LKB1 into HeLa cells that lack endogenous LKB1. This results in activation of the small GTPase Rho and the assembly of linear actin filaments associated with focal adhesions. These effects on the actin cytoskeleton are attenuated by siRNA-mediated depletion of the guanine nucleotide exchange factor Dbl. Co-expression of the LKB1 with the adaptor protein STRAD induces actin filament puncta associated with phospho-ezrin. Conclusions: This study reveals that LKB1 regulates the actin cytoskeleton through a Dbl/Rho pathway.
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- Authors
- Xu, X., Omelchenko, T., & Hall, A.
- Affiliations
- Memorial Sloan Kettering Cancer Center (US)
- Corresponding author
- Hall, Alan
- Venue
- BMC Cell Biology
- Published
- 2010-10-12
- Volume
- 11
- Issue
- 1
- Pages
- 77-77
- ISSN
- 1471-2121 (ISSN-L)
- PMC
- PMC2964536
- OpenAlex
- W2069519244
- Cited by
- 33
- References
- 23
- Citations by year
- 2025: 2 · 2023: 1 · 2022: 1 · 2021: 1 · 2017: 3 · 2016: 4 · 2015: 1 · 2014: 4 · 2013: 7 · 2012: 5
- FWCI
- 2.07
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- BMC Cell Biology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Case Western Reserve University
- National Institutes of Health (CA08748)
- National Cancer Institute (CA08748, P30CA008748)
- National Institute of General Medical Sciences (R01GM081435, GM081435)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hippo pathway signaling and YAP/TAZ
- Keywords
- LKB1, tumor suppressor, actin filament assembly, Rho GTPases, STRAD, ezrin, focal adhesions, actin cytoskeleton, Peutz-Jeghers syndrome, Par-4, kinase-independent function
- MeSH terms
- AMP-Activated Protein Kinase Kinases, Ezrin, Carcinoma, Cell Transformation, Neoplastic, Cytoskeletal Proteins, DNA-Binding Proteins, Enzyme Activation, HeLa Cells, Humans, Intestinal Neoplasms, Actin Cytoskeleton, Mutation, Peutz-Jeghers Syndrome, Transcription Factors, Signal Transduction, Protein Serine-Threonine Kinases, Transgenes, rho GTP-Binding Proteins, Tumor Suppressor Proteins, Adaptor Proteins, Vesicular Transport, RNA, Small Interfering
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