Cited by 67PI3K/AKT/mTOR signaling in cancerTuberous Sclerosis Complex ResearchHippo pathway signaling and YAP/TAZ

The p53 target Plk2 interacts with TSC proteins impacting mTOR signaling, tumor growth, and chemosensitivity under hypoxic conditions

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Matthew, Elizabeth M., Hart, Lori S., Astrinidis, Aristotelis, Navaraj, Arunasalam, Dolloff, Nathan G., Dicker, David T., Henske, Elizabeth P., El-Deiry, Wafik S.·2009·Cell Cycle

Abstract

Tuberous sclerosis complex 1 (TSC1) inhibits mammalian target of rapamycin (mTOR), a central promotor of cell growth and proliferation. The protein product of the TSC1 gene, hamartin (referred to as TSC1) is known to interact with Polo-like kinase 1 (Plk1) in a cell cycle regulated, phosphorylation-dependent manner. We hypothesized that the p53 target gene, Plk2, is a tumor suppressor, mediating its tumor suppressor function through interactions with TSC1 that facilitate TSC1/2 restraint of mTOR under hypoxic stress. We found that human lung tumor cells deficient in Plk2 grew larger than control tumors, and that Plk2 interacts with endogenous TSC1 protein. Additionally, C-terminal Plk2-GST fusion protein bound both TSC1 and TSC2 proteins. TSC1 levels were elevated in response to Adriamycin and cells transiently overexpressing Plk2 demonstrated decreased phosphorylation of the downstream target of mTOR, ribosomal protein p70S6 kinase during hypoxia. Plk2 levels were inversely correlated with cytoplasmic p70S6K phosphorylation. Plk2 levels did not increase in response to DNA damage (Adriamycin, CPT -11) when HCT 116 and H460 cells were exposed to hypoxia. TSC1-deficient mouse embryonic fibroblasts with TSC1 added back demonstrated decreased S6K phosphorylation, which was further decreased when Plk2 was transiently overexpressed. Interestingly, under normoxia, Plk2 deficient tumor cells demonstrated increased apoptosis in response to various chemotherapeutic agents including CPT -11 but increased resistance to apoptotic death after CPT-11 treatment under hypoxia, and tumor xenografts comprised of these Plk2-deficient cells were resistant to CPT -11. Our results point to a novel Plk2-TSC1 interaction with effects on mTOR signaling during hypoxia, and tumor growth that may enable targeting Plk2 signaling in cancer therapy.

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  • Quantitative proteomic analysis of protein expression changes conferred by asukamycin treatment in 231MFP cells showed many known p53 transcriptional targets upregulated, including GADD45A, GADD45B, ANKRD1, HMOX1, ATF3, PMAIP1, DDIT4, DNAJB9, and PLK2.

    “quantitative proteomic analysis of protein expression changes conferred by asukamycin treatment in 231MFP cells showed many known p53 transcriptional targets upregulated in expression, including GADD45A, GADD45B, ANKRD1, HMOX1, ATF3, PMAIP1, DDIT4, DNAJB9, and PLK2 (Extended Data Figure 9) 31–37.”

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Authors
Matthew, E. M., Hart, L. S., Astrinidis, A., Navaraj, A., Dolloff, N. G., Dicker, D. T., Henske, E. P., & El-Deiry, W. S.
Affiliations
  • University of Pennsylvania (US)
  • Drexel University (US)
  • Abramson Cancer Center (US)
  • Brigham and Women's Hospital (US)
Venue
Cell Cycle
Published
2009-12-15
Volume
8
Issue
24
Pages
4168-4175
ISSN
  • 1538-4101 (ISSN-L)
  • 1551-4005
OpenAlex
W2071765634
Cited by
67
References
20
Citations by year
2024: 1 · 2023: 1 · 2022: 5 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 3 · 2017: 3 · 2016: 2 · 2015: 5 · 2014: 8 · 2013: 6 · 2012: 12
FWCI
3.63
Type
journal article
Language
en
Open access
Locations
  • Cell Cycle (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • American Cancer Society
  • University of Pennsylvania
  • National Institutes of Health
  • National Cancer Institute (CA-105008, U54CA105008, CA135273, CA123258, R01CA123258, R01CA135273)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Health Sciences › Medicine › Physiology › Tuberous Sclerosis Complex Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hippo pathway signaling and YAP/TAZ
Keywords
PLK2, TSC1, TSC2, mTOR signaling, hypoxia, p53 target genes, tumor suppressor, chemoresistance, camptothecin, doxorubicin, apoptosis, tumor growth, lung cancer, hamartin
MeSH terms
Tuberous Sclerosis Complex 1 Protein, Tuberous Sclerosis Complex 2 Protein, Animals, Antineoplastic Agents, Disease Models, Animal, Female, Graft Survival, Humans, Mice, Nude, Neoplasms, Phosphorylation, Recombinant Fusion Proteins, Transplantation, Heterologous, Signal Transduction, Cell Hypoxia, Tumor Suppressor Protein p53, Apoptosis, Protein Serine-Threonine Kinases, Drug Resistance, Neoplasm, Tumor Suppressor Proteins, Ribosomal Protein S6 Kinases, 70-kDa, Cell Line, Tumor, Intracellular Signaling Peptides and Proteins, Mice, TOR Serine-Threonine Kinases

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