Cited by 44Protein Kinase Regulation and GTPase SignalingMelanoma and MAPK PathwaysProtein Tyrosine Phosphatases

Identification of a c-Jun N-terminal kinase-2-dependent signal amplification cascade that regulates c-Myc levels in ras transformation

Mathiasen, D P, Egebjerg, C, Andersen, S H, Rafn, B, Puustinen, P, Khanna, A, Daugaard, M, Valo, E +9 more·2012·Oncogene

Abstract

Ras is one of the most frequently activated oncogenes in cancer. Two mitogen-activated protein kinases (MAPKs) are important for ras transformation: extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase 2 (JNK2). Here we present a downstream signal amplification cascade that is critical for ras transformation in murine embryonic fibroblasts. This cascade is coordinated by ERK and JNK2 MAPKs, whose Ras-mediated activation leads to the enhanced levels of three oncogenic transcription factors, namely, c-Myc, activating transcription factor 2 (ATF2) and ATF3, all of which are essential for ras transformation. Previous studies show that ERK-mediated serine 62 phosphorylation protects c-Myc from proteasomal degradation. ERK is, however, not alone sufficient to stabilize c-Myc but requires the cooperation of cancerous inhibitor of protein phosphatase 2A (CIP2A), an oncogene that counteracts protein phosphatase 2A-mediated dephosphorylation of c-Myc. Here we show that JNK2 regulates Cip2a transcription via ATF2. ATF2 and c-Myc cooperate to activate the transcription of ATF3. Remarkably, not only ectopic JNK2, but also ectopic ATF2, CIP2A, c-Myc and ATF3 are sufficient to rescue the defective ras transformation of JNK2-deficient cells. Thus, these data identify the key signal converging point of JNK2 and ERK pathways and underline the central role of CIP2A in ras transformation.

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Crossref · 10.1038/onc.2011.230

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Authors
Mathiasen, D. P., Egebjerg, C., Andersen, S. H., Rafn, B., Puustinen, P., Khanna, A., Daugaard, M., Valo, E., Tuomela, S., Bøttzauw, T., Nielsen, C. F., Willumsen, B. M., Hautaniemi, S., Lahesmaa, R., Westermarck, J., Jäättelä, M., & Kallunki, T.
Affiliations
  • Danish Cancer Society (DK)
  • University of Tampere (FI)
  • University of Helsinki (FI)
  • Åbo Akademi University (FI)
  • University of Copenhagen (DK)
Corresponding author
Kallunki, T
Venue
Oncogene
Published
2011-06-27
Volume
31
Issue
3
Pages
390-401
ISSN
  • 0950-9232 (ISSN-L)
  • 1476-5594
OpenAlex
W2067854511
Cited by
44
References
65
Citations by year
2025: 1 · 2024: 1 · 2023: 2 · 2022: 2 · 2021: 4 · 2018: 3 · 2017: 3 · 2016: 2 · 2015: 4 · 2014: 8 · 2013: 9 · 2012: 4
FWCI
2.86
Type
journal article
Language
en
Open access
closed
Locations
  • Oncogene (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
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 › Melanoma and MAPK Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
Keywords
ERK, Ras transformation, c-Myc, ATF2, ATF3, CIP2A, protein phosphatase 2A, proteasomal degradation, MAPK signaling, transcriptional regulation, murine embryonic fibroblasts
MeSH terms
Animals, Cell Transformation, Neoplastic, Cells, Cultured, Fibroblasts, Mice, Inbred BALB C, Mice, Nude, Genes, ras, Proto-Oncogene Proteins c-myc, ras Proteins, MAP Kinase Signaling System, Mitogen-Activated Protein Kinase 9, Mice, Activating Transcription Factor 2, Activating Transcription Factor 3, Protein Phosphatase 2

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