Cited by 85Hippo pathway signaling and YAP/TAZPI3K/AKT/mTOR signaling in cancerProtein Kinase Regulation and GTPase Signaling

LKB1 tumor suppressor regulates AMP kinase/mTOR-independent cell growth and proliferation via the phosphorylation of Yap

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Nguyen, H B, Babcock, J T, Wells, C D, Quilliam, L A·2013·Oncogene

Abstract

The liver kinase B1 (LKB1) tumor suppressor inhibits cell growth through its regulation of cellular metabolism and apical-basal polarity. The best understood mechanism whereby LKB1 limits cell growth is through activation of the AMP-activated-protein-kinase/mammalian-target-of-rapamycin (AMPK/mTOR) pathway to control metabolism. As LKB1 is also required for polarized epithelial cells to resist hyperplasia, it is anticipated to function through additional mechanisms. Recently, Yes-associated protein (Yap) has emerged as a transcriptional co-activator that modulates tissue homeostasis in response to cell-cell contact. Thus this study examined a possible connection between Yap and LKB1. Restoration of LKB1 expression in HeLa cells, which lack this tumor suppressor, or short-hairpin RNA knockdown of LKB1 in NTERT immortalized keratinocytes, demonstrated that LKB1 promotes Yap phosphorylation, nuclear exclusion and proteasomal degradation. The ability of phosphorylation-defective Yap mutants to rescue LKB1 phenotypes, such as reduced cell proliferation and cell size, suggest that Yap inhibition contributes to LKB1 tumor suppressor function(s). However, failure of Lats1/2 knockdown to suppress LKB1-mediated Yap regulation suggested that LKB1 signals to Yap via a non-canonical pathway. Additionally, LKB1 inhibited Yap independently of either AMPK or mTOR activation. These findings reveal a novel mechanism whereby LKB1 may restrict cancer cell growth via the inhibition of Yap.

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Crossref · 10.1038/onc.2012.431

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Authors
Nguyen, H. B., Babcock, J. T., Wells, C. D., & Quilliam, L. A.
Affiliations
  • Indiana University Indianapolis (US)
  • Indiana University School of Medicine (US)
Corresponding author
Quilliam, L A
Venue
Oncogene
Published
2012-10-01
Volume
32
Issue
35
Pages
4100-4109
ISSN
  • 0950-9232 (ISSN-L)
  • 1476-5594
OpenAlex
W1996122722
Cited by
84
References
46
Citations by year
2026: 4 · 2025: 4 · 2024: 1 · 2023: 4 · 2022: 2 · 2021: 5 · 2020: 8 · 2019: 5 · 2018: 5 · 2017: 11 · 2016: 8 · 2015: 14 · 2014: 10 · 2013: 2 · 2012: 1
FWCI
4.09
Type
journal article
Language
en
Open access
Locations
  • Oncogene (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • IUScholarWorks (Indiana University) (submittedVersion)
Funders
  • U.S. Department of Defense
  • LAM Foundation
  • Indiana University-Purdue University Indianapolis
  • National Cancer Institute (R01CA151765)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hippo pathway signaling and YAP/TAZ
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
LKB1, tumor suppressor, YAP, YAP phosphorylation, nuclear exclusion, proteasomal degradation, cell proliferation, cell growth, cell size, LATS1/2, AMPK/mTOR signaling, apical-basal polarity, epithelial hyperplasia, keratinocytes, HeLa cells
MeSH terms
YAP-Signaling Proteins, AMP-Activated Protein Kinase Kinases, Adenylate Kinase, HeLa Cells, Humans, Phosphoproteins, Phosphorylation, Transcription Factors, Transcription, Genetic, Protein Serine-Threonine Kinases, Stress Fibers, Tumor Suppressor Proteins, Proteasome Endopeptidase Complex, Cell Size, Adaptor Proteins, Signal Transducing, Cell Proliferation, TOR Serine-Threonine Kinases

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