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Article

Activation of ERK/IER3/PP2A-B56γ-positive feedback loop in lung adenocarcinoma by allelic deletion of B56γ gene

  • Authors:
    • Tomoko Ito
    • Satoru Ozaki
    • Rachanee Chanasong
    • Yuki Mizutani
    • Takeru Oyama
    • Hiroshi Sakurai
    • Isao Matsumoto
    • Hirofumi Takemura
    • Ei Kawahara
  • View Affiliations / Copyright

    Affiliations: Department of Thoracic, Cardiovascular and General Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa 920-8640, Japan, Department of Clinical Laboratory Medicine, Graduate School of Health Sciences, Kanazawa University, Kanazawa 920-0942, Japan, Department of Anatomy, Faculty of Medical Sciences, Naresuan University, Phitsanulok 65000, Thailand, Department of Pathology, Graduate School of Medical Sciences, Kanazawa University, Kanazawa 920-8640, Japan
  • Pages: 2635-2642
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    Published online on: March 16, 2016
       https://doi.org/10.3892/or.2016.4677
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Abstract

In order to investigate the involvement of the IER3/PP2A-B56γ/ERK-positive feedback loop, which leads to sustained phosphorylation/activation of ERK in carcinogenesis, we immunohistochemically examined the expression of IER3 and phosphorylated ERK in lung tumor tissues. IER3 was overexpressed in all cases of adenocarcinomas examined, but was not overexpressed in squamous cell carcinomas. Phosphorylated ERK (pERK) was also overexpressed in almost all adenocarcinomas. EGFR and RAS, whose gene product is located upstream of ERK, were sequenced. Activating mutation of EGFR, which is a possible cause of overexpression of IER3 and pERK, was found only in 5 adenocarcinomas (42%). No mutation of RAS was found. We further examined the sequences of all exons of B56γ gene (PPP2R5C) and IER3, but no mutation was found. Using a single nucleotide insertion in intron 1 of PPP2R5C, which was found in the process of sequencing, allelic deletion of PPP2R5C was examined. Eight cases were informative (67%), and the deletion was found in 4 of them (50%). Three cases having deletion of PPP2R5C did not have EGFR mutation. Finally, PPP2R5C deletion or EGFR mutation that could be responsible for IER3/pERK overexpression was found in at least 8 cases (67% or more). This is the first report of a high incidence of deletion of PPP2R5C in human carcinomas.
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Copy and paste a formatted citation
Spandidos Publications style
Ito T, Ozaki S, Chanasong R, Mizutani Y, Oyama T, Sakurai H, Matsumoto I, Takemura H and Kawahara E: Activation of ERK/IER3/PP2A-B56γ-positive feedback loop in lung adenocarcinoma by allelic deletion of B56γ gene. Oncol Rep 35: 2635-2642, 2016.
APA
Ito, T., Ozaki, S., Chanasong, R., Mizutani, Y., Oyama, T., Sakurai, H. ... Kawahara, E. (2016). Activation of ERK/IER3/PP2A-B56γ-positive feedback loop in lung adenocarcinoma by allelic deletion of B56γ gene. Oncology Reports, 35, 2635-2642. https://doi.org/10.3892/or.2016.4677
MLA
Ito, T., Ozaki, S., Chanasong, R., Mizutani, Y., Oyama, T., Sakurai, H., Matsumoto, I., Takemura, H., Kawahara, E."Activation of ERK/IER3/PP2A-B56γ-positive feedback loop in lung adenocarcinoma by allelic deletion of B56γ gene". Oncology Reports 35.5 (2016): 2635-2642.
Chicago
Ito, T., Ozaki, S., Chanasong, R., Mizutani, Y., Oyama, T., Sakurai, H., Matsumoto, I., Takemura, H., Kawahara, E."Activation of ERK/IER3/PP2A-B56γ-positive feedback loop in lung adenocarcinoma by allelic deletion of B56γ gene". Oncology Reports 35, no. 5 (2016): 2635-2642. https://doi.org/10.3892/or.2016.4677
Copy and paste a formatted citation
x
Spandidos Publications style
Ito T, Ozaki S, Chanasong R, Mizutani Y, Oyama T, Sakurai H, Matsumoto I, Takemura H and Kawahara E: Activation of ERK/IER3/PP2A-B56γ-positive feedback loop in lung adenocarcinoma by allelic deletion of B56γ gene. Oncol Rep 35: 2635-2642, 2016.
APA
Ito, T., Ozaki, S., Chanasong, R., Mizutani, Y., Oyama, T., Sakurai, H. ... Kawahara, E. (2016). Activation of ERK/IER3/PP2A-B56γ-positive feedback loop in lung adenocarcinoma by allelic deletion of B56γ gene. Oncology Reports, 35, 2635-2642. https://doi.org/10.3892/or.2016.4677
MLA
Ito, T., Ozaki, S., Chanasong, R., Mizutani, Y., Oyama, T., Sakurai, H., Matsumoto, I., Takemura, H., Kawahara, E."Activation of ERK/IER3/PP2A-B56γ-positive feedback loop in lung adenocarcinoma by allelic deletion of B56γ gene". Oncology Reports 35.5 (2016): 2635-2642.
Chicago
Ito, T., Ozaki, S., Chanasong, R., Mizutani, Y., Oyama, T., Sakurai, H., Matsumoto, I., Takemura, H., Kawahara, E."Activation of ERK/IER3/PP2A-B56γ-positive feedback loop in lung adenocarcinoma by allelic deletion of B56γ gene". Oncology Reports 35, no. 5 (2016): 2635-2642. https://doi.org/10.3892/or.2016.4677
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