Cited by 69Pancreatic and Hepatic Oncology ResearchProtein Tyrosine PhosphatasesProtein Kinase Regulation and GTPase Signaling

PR55α subunit of protein phosphatase 2A supports the tumorigenic and metastatic potential of pancreatic cancer cells by sustaining hyperactive oncogenic signaling

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Hein, Ashley L., Seshacharyulu, Parthasarathy, Rachagani, Satyanarayana, Sheinin, Yuri M., Ouellette, Michel M., Ponnusamy, Moorthy P., Mumby, Marc C., Batra, Surinder K. +1 more·2016·Cancer Research

Published version of a preprint

Abstract

The protein phosphatase 2 (PP2A) holoenzyme consists of a catalytic subunit, a scaffold subunit, and a regulatory subunit. Based on loss-of-function analysis using PP2A catalytic inhibitors or inhibition via tumor viral antigens, limited studies suggest that PP2A is a putative tumor suppressor. However, PP2A has also been shown to facilitate the activation of oncogenic signaling pathways when associated with specific regulatory subunits. In this study, we investigated the possible oncogenic role of PP2A in pancreatic cancer. We found a striking increase in the expression of PR55α (PPP2R2A), a PP2A regulatory subunit, in pancreatic cancer cells compared with normal pancreatic epithelial cells. Consistently, PR55α expression was markedly elevated in pancreatic ductal adenocarcinoma tissues compared with adjacent normal pancreatic tissues (P < 0.0001) and correlated with poor survival of pancreatic cancer patients (P < 0.0003). RNAi-mediated depletion of PR55α in pancreatic cancer cell lines resulted in diminished phosphorylation of both AKT and ERK1/2 (MAPK3/1) and decreased protein levels of β-catenin (CTNNB1). Accordingly, pancreatic cancer cells with reduced PR55α expression exhibited significantly impaired properties of transformation, including attenuated cell growth, clonogenicity, mobility, and anchorage-independent growth. Moreover, orthotopic implantation of PR55α-depleted pancreatic cancer cells into nude mice resulted in markedly reduced tumorigenicity (P < 0.001) and distant metastases. Together, these results suggest that PR55α promotes pancreatic cancer development by sustaining hyperactivity of multiple oncogenic signaling pathways, including AKT, ERK, and Wnt. These studies also provide a basis for exploring PR55α as a diagnostic or therapeutic target in pancreatic cancer. Cancer Res; 76(8); 2243-53. ©2016 AACR.

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Crossref · 10.1158/0008-5472.can-15-2119

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  • B55α overexpression is observed in pancreatic ductal adenocarcinoma and correlates with poor patient prognosis.

    “While there is growing evidence supporting a tumor suppressor role for PPP2R2A, B55α overexpression has been observed in pancreatic ductal adenocarcinoma tissues and correlated with poor patient prognosis (Hein et al., 2016).”

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Authors
Hein, A. L., Seshacharyulu, P., Rachagani, S., Sheinin, Y. M., Ouellette, M. M., Ponnusamy, M. P., Mumby, M. C., Batra, S. K., & Yan, Y.
Affiliations
  • University of Nebraska Medical Center (US)
  • The University of Texas Southwestern Medical Center (US)
Corresponding author
  • Batra, Surinder K.
  • Yan, Ying
Venue
Cancer Research
Published
2016-04-14
Volume
76
Issue
8
Pages
2243-2253
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W2283790305
Cited by
66
References
49
Citations by year
2026: 1 · 2025: 8 · 2024: 8 · 2023: 5 · 2022: 4 · 2021: 7 · 2020: 9 · 2019: 11 · 2018: 9 · 2017: 3 · 2016: 1
FWCI
4.32
Type
journal article
Language
en
Open access
Locations
  • Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
Pilot Project (5P30GM106397, U54CA163120, P50CA127297)
Topics
  • Health Sciences › Medicine › Oncology › Pancreatic and Hepatic Oncology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
PPP2R2A, protein phosphatase 2A regulatory subunit, pancreatic ductal adenocarcinoma, oncogenic signaling, Akt signaling, ERK signaling, Wnt/β-catenin signaling, tumorigenicity, metastasis, tumor suppressor, prognostic factors, therapeutic target
MeSH terms
Animals, Humans, Neoplasm Metastasis, Oncogenes, Pancreatic Neoplasms, Signal Transduction, Cell Line, Tumor, Mice, Protein Phosphatase 2

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