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A PTEN translational isoform has PTEN-like activity

Xie Zhang1, Bowei Yin1, Fangfang Zhu1

  • 11 Department of Gastroenterology, Ningbo Medical Center, LiHuiLi Hospital, Ningbo 315040, Zhejiang, China ; 2 School of Medicine, Ningbo University, Ningbo 315211, Zhejiang, China ; 3 Ningbo Medical Center, 4 Minimally Invasive Abdominal Surgery, Ningbo Medical Center, LiHuiLi Hospital, Ningbo 315040, Zhejiang Province, China.

Chinese Journal of Cancer Research = Chung-Kuo Yen Cheng Yen Chiu
|November 7, 2015
PubMed
Abstract

Insights

A newly identified PTEN isoform, larger than the standard PTEN protein, demonstrates tumor suppressor functions by inhibiting cell growth and promoting apoptosis. This PTEN isoform may represent a novel target for cancer therapy.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Biochemistry

Background:

  • The phosphatase and tensin homolog (PTEN) is a critical tumor suppressor.
  • The existence and function of a PTEN isoform were previously unknown.

Purpose of the Study:

  • To identify and characterize a novel PTEN isoform.
  • To investigate the role of this PTEN isoform in tumor suppression and the PI3K-Akt signaling pathway.

Main Methods:

  • Western blotting, immunoprecipitation, and bioinformatic analysis were employed to identify and validate the PTEN isoform.
  • Cellular assays including proliferation, apoptosis, and migration assays were performed to assess biological activities.
  • Overexpression and shRNA-mediated knockdown techniques were utilized to study PTEN isoform expression and function.

Main Results:

  • A PTEN isoform approximately 15 kDa larger than PTEN was identified, with expression dependent on PTEN status.
  • The PTEN isoform is not a result of common post-translational modifications; its expression originates from an alternative upstream CTG start codon.
  • Overexpression of the PTEN isoform suppressed the PI3K-Akt pathway, reduced cell growth, enhanced apoptosis, and inhibited cell migration.

Conclusions:

  • The identified PTEN isoform possesses PTEN-like tumor suppressor activity.
  • This PTEN isoform represents a potential new player in tumor suppression and warrants further investigation.
Keywords:
PI3K-AktPTENPTEN isoformapoptosiscell growthcell migrationtumor suppressor

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