Cited by 67PI3K/AKT/mTOR signaling in cancerMechanisms of cancer metastasisRNA and protein synthesis mechanisms

Tumor suppressor Pdcd4 attenuates Sin1 translation to inhibit invasion in colon carcinoma

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Wang, Q, Zhu, J, Wang, Y-W, Dai, Y, Wang, Y-L, Wang, C, Liu, J, Baker, A +2 more·2017·Oncogene

Abstract

Programmed cell death 4 (Pdcd4), a tumor invasion suppressor, is frequently downregulated in colorectal cancer and other cancers. In this study, we find that loss of Pdcd4 increases the activity of mammalian target of rapamycin complex 2 (mTORC2) and thereby upregulates Snail expression. Examining the components of mTORC2 showed that Pdcd4 knockdown increased the protein but not mRNA level of stress-activated-protein kinase interacting protein 1 (Sin1), which resulted from enhanced Sin1 translation. To understand how Pdcd4 regulates Sin1 translation, the SIN1 5' untranslated region (5'UTR) was fused with luciferase reporter and named as 5'Sin1-Luc. Pdcd4 knockdown/knockout significantly increased the translation of 5'Sin1-Luc but not the control luciferase without the SIN1 5'UTR, suggesting that Sin1 5'UTR is necessary for Pdcd4 to inhibit Sin1 translation. Ectopic expression of wild-type Pdcd4 and Pdcd4(157-469), a deletion mutant that binds to translation initiation factor 4A (eIF4A), sufficiently inhibited Sin1 translation, and thus suppressed mTORC2 kinase activity and invasion in colon tumor cells. By contrast, Pdcd4(157-469)(D253A,D418A), a mutant that does not bind to eIF4A, failed to inhibit Sin1 translation, and consequently failed to repress mTORC2 activity and invasion. In addition, directly inhibiting eIF4A with silvestrol significantly suppressed Sin1 translation and attenuated invasion. These results indicate that Pdcd4-inhibited Sin1 translation is through suppressing eIF4A, and functionally important for suppression of mTORC2 activity and invasion. Moreover, in colorectal cancer tissues, the Sin1 protein but not mRNA was significantly upregulated while Pdcd4 protein was downregulated, suggesting that loss of Pdcd4 might correlate with Sin1 protein level but not mRNA level in colorectal cancer patients. Taken together, our work reveals a novel mechanism by which Pdcd4 inhibits Sin1 translation to attenuatemTORC2 activity and thereby suppresses invasion.

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  • The mRNAs of TP53 and SIN1 are physiological translational targets of PDCD4.

    “It was reported that the mRNAs of the tumor suppressor TP53 and stress-activated-protein kinase interacting protein-1 (SIN1) are such physiological translational targets of PDCD4 [25,26].”

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  1. [49]Ikenoue T Hong S Inoki K Monitoring mammalian target of rapamycin (mTOR) activity Methods Enzymol 2009 452 165 180 19200882

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Authors
Wang, Q., Zhu, J., Wang, Y.-W., Dai, Y., Wang, Y.-L., Wang, C., Liu, J., Baker, A., Colburn, N. H., & Yang, H.-S.
Affiliations
  • University of Kentucky (US)
  • Shandong University (CN)
  • Qilu Hospital of Shandong University (CN)
  • National Cancer Institute (US)
Corresponding author
  • Zhu, J
  • Yang, H-S
Venue
Oncogene
Published
2017-07-10
Volume
36
Issue
45
Pages
6225-6234
ISSN
  • 0950-9232 (ISSN-L)
  • 1476-5594
OpenAlex
W2735343979
Cited by
67
References
50
Citations by year
2026: 4 · 2025: 6 · 2024: 8 · 2023: 4 · 2022: 4 · 2021: 9 · 2020: 17 · 2019: 6 · 2018: 8
FWCI
3.46
Type
journal article
Language
en
Open access
Locations
  • Oncogene (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • UKnowledge (University of Kentucky) (submittedVersion)
Funders
National Cancer Institute (R03CA187839, R01CA129015, P30CA177558)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mechanisms of cancer metastasis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
Keywords
PDCD4, SIN-1, mTORC2, eIF4A, translational regulation, 5' untranslated region, colorectal cancer, tumor invasion, snails, silvestrol, tumor suppressor
MeSH terms
Mechanistic Target of Rapamycin Complex 2, Animals, Carrier Proteins, Colonic Neoplasms, Humans, Mice, Nude, Neoplasm Invasiveness, Transfection, Protein Biosynthesis, Genes, Tumor Suppressor, RNA-Binding Proteins, Mice, Knockout, HT29 Cells, Eukaryotic Initiation Factor-4A, HCT116 Cells, Cell Line, Tumor, Adaptor Proteins, Signal Transducing, Apoptosis Regulatory Proteins, Mice

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