Cited by 100Protein Kinase Regulation and GTPase SignalingProtein Tyrosine PhosphatasesMelanoma and MAPK Pathways

The RhoGEF GEF-H1 is required for oncogenic RAS signaling via KSR-1

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Cullis, Jane, Meiri, David, Sandi, Maria Jose, Radulovich, Nikolina, Kent, Oliver A., Medrano, Mauricio, Mokady, Daphna, Normand, Josee +10 more·2014·Cancer Cell

Abstract

Cellular transformation by oncogenic RAS engages the MAPK pathway under strict regulation by the scaffold protein KSR-1. Here, we report that the guanine nucleotide exchange factor GEF-H1 plays a critical role in a positive feedback loop for the RAS/MAPK pathway independent of its RhoGEF activity. GEF-H1 acts as an adaptor protein linking the PP2A B' subunits to KSR-1, thereby mediating the dephosphorylation of KSR-1 S392 and activation of MAPK signaling. GEF-H1 is important for the growth and survival of HRAS(V12)-transformed cells and pancreatic tumor xenografts. GEF-H1 expression is induced by oncogenic RAS and is correlated with pancreatic neoplastic progression. Our results, therefore, identify GEF-H1 as an amplifier of MAPK signaling and provide mechanistic insight into the progression of RAS mutant tumors.

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Crossref · 10.1016/j.ccr.2014.01.025

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  • GEF-H1 links KSR1 to PP2A and is needed for KSR1 dephosphorylation and oncogenic RAS signaling through KSR1.

    “More recent studies have found that the guanine nucleotide exchange factor GEF-H1 serves as the bridge linking KSR1 to PP2A, as it is required for KSR1 dephosphorylation and oncogenic RAS signaling via KSR1 (Cullis et al., 2014).”

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Authors
Cullis, J., Meiri, D., Sandi, M. J., Radulovich, N., Kent, O. A., Medrano, M., Mokady, D., Normand, J., Larose, J., Marcotte, R., Marshall, C. B., Ikura, M., Ketela, T., Moffat, J., Neel, B. G., Gingras, A.-C., Tsao, M.-S., & Rottapel, R.
Affiliations
  • University Health Network (CA)
  • University of Toronto (CA)
  • Mount Sinai Hospital (CA)
  • St. Michael's Hospital (CA)
Corresponding author
Rottapel, Robert
Venue
Cancer Cell
Publisher
Elsevier BV
Published
2014-02
Volume
25
Issue
2
Pages
181-195
ISSN
1535-6108 (ISSN-L)
OpenAlex
W1979041306
Cited by
100
References
67
Citations by year
2026: 6 · 2025: 7 · 2024: 7 · 2023: 5 · 2022: 11 · 2021: 8 · 2020: 9 · 2019: 9 · 2018: 7 · 2017: 13 · 2016: 10 · 2015: 6 · 2014: 2
FWCI
4.23
Type
journal article
Language
en
Open access
Locations
  • Cancer Cell (publishedVersion)
  • PubMed (publishedVersion)
Funders
Canadian Institutes of Health Research
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Melanoma and MAPK Pathways
Keywords
GEF-H1, oncogenic Ras, KSR1, MAPK signaling, positive feedback loop, pancreatic cancer, tumor progression, cell transformation
MeSH terms
Adenocarcinoma, Animals, Cell Transformation, Neoplastic, Cells, Cultured, Embryo, Mammalian, Fibroblasts, Humans, Immunoenzyme Techniques, Pancreatic Neoplasms, Phosphorylation, Promoter Regions, Genetic, Protein Kinases, Tumor Cells, Cultured, Signal Transduction, Gene Expression Regulation, Neoplastic, ras Proteins, NIH 3T3 Cells, Mice, Rho Guanine Nucleotide Exchange Factors

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