Cited by 29Cancer-related Molecular PathwaysPI3K/AKT/mTOR signaling in cancerProtein Kinase Regulation and GTPase Signaling

Hdm2 Nuclear Export, Regulated by Insulin-like Growth Factor-I/MAPK/p90Rsk Signaling, Mediates the Transformation of Human Cells

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Jackson, Mark W., Patt, Linnea E., LaRusch, Gretchen A., Donner, David B., Stark, George R., Mayo, Lindsey D.·2006·Journal of Biological Chemistry

Abstract

Insulin-like growth factor (IGF)-I receptor activation leads to enhanced proliferation and cell survival via the MAP kinase and phosphatidylinositol 3-kinase-signaling pathways. Upon stimulation by IGF-I, the Hdm2 oncoprotein is phosphorylated by AKT, leading to its rapid nuclear translocation and subsequent inhibition of p53. We now show that IGF-I stimulation regulates the nuclear export of Hdm2 and p53 via the MAP kinase pathway. Inhibition of p38 MAPK or MEK via pharmacological means or expression of dominant negative proteins inhibited the cytoplasmic accumulation of Hdm2 and increased Hdm2 and p53 protein levels, whereas constitutively active p90Rsk promoted the nuclear export of Hdm2. Expression of constitutively active p90Rsk with E1A, oncogenic H-Ras, and hTERT resulted in the anchorage-independent growth of normal human fibroblasts. Our findings link p90Rsk-mediated modulation of Hdm2 nuclear to cytoplasmic shuttling with the diminished ability of p53 to regulate cell cycle checkpoints that ultimately leads to transformation.

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Crossref · 10.1074/jbc.m511617200

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  • AKT-mediated stabilization of MDM2 may partly account for the anti-apoptotic effect of PI3K-AKT signaling.

    “This may be partly due to AKT-dependent stabilization of MDM2 (Refs 125,126).”

    From MDM2, MDMX and p53 in oncogenesis and cancer therapy (2013) · cites this paper as [126]

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Authors
Jackson, M. W., Patt, L. E., LaRusch, G. A., Donner, D. B., Stark, G. R., & Mayo, L. D.
Affiliations
  • Cleveland Clinic (US)
  • Case Comprehensive Cancer Center (US)
  • Indiana University Indianapolis (US)
Corresponding author
Mayo, Lindsey D.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2006-06
Volume
281
Issue
24
Pages
16814-16820
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2122946396
Cited by
29
References
25
Citations by year
2024: 1 · 2021: 1 · 2018: 1 · 2017: 1 · 2014: 3 · 2013: 4 · 2012: 1
FWCI
2.25
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Heart, Lung, and Blood Institute (F32HL072661)
  • National Cancer Institute (P-30 CA43703, T32 CA 59366, R01CA109262, P30CA043703, T32CA059366)
  • National Institute of General Medical Sciences (R01GM049345)
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • 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
MDM2, nuclear export, p53, insulin-like growth factor I, IGF-1 receptor, MAPK signaling, p38 MAPK, MEK, p90RSK, cell transformation, anchorage-independent growth, cell cycle checkpoints, hTERT, adenovirus E1A, dominant negative protein, Akt phosphorylation
MeSH terms
Cytoplasm, Fibroblasts, Humans, Insulin-Like Growth Factor I, Phosphorylation, Retroviridae, Signal Transduction, Tumor Suppressor Protein p53, Phosphatidylinositol 3-Kinases, MAP Kinase Signaling System, Active Transport, Cell Nucleus, Ribosomal Protein S6 Kinases, 90-kDa, Cell Line, Tumor, Proto-Oncogene Proteins c-mdm2

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