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miR-93 functions as an oncomiR for the downregulation of PDCD4 in gastric carcinoma

Hongwei Liang1, Feng Wang2, Danping Chu1

  • 1State Key Laboratory of Pharmaceutical Biotechnology, NJU Advanced Institute for Life Sciences, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Science, Nanjing University, Nanjing, Jiangsu 210093, China.

Scientific Reports
|March 30, 2016
PubMed

Insights

MicroRNA-93 (miR-93) promotes gastric cancer by suppressing the tumor suppressor programmed cell death 4 (PDCD4). This leads to reduced apoptosis and increased tumor growth, highlighting miR-93 as an oncogenic factor in gastric cancer.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • Programmed cell death 4 (PDCD4) is a tumor suppressor frequently downregulated in gastric cancer, impacting apoptosis and tumorigenesis.
  • The upstream regulatory mechanisms of PDCD4 in gastric cancer remain largely uncharacterized.

Purpose of the Study:

  • To investigate the role of microRNAs (miRNAs) in regulating PDCD4 expression in gastric cancer.
  • To elucidate the molecular mechanism by which miR-93 influences gastric cancer progression.

Main Methods:

  • Bioinformatic analysis to identify potential miRNA targets of PDCD4.
  • Correlation analysis of miR-93 and PDCD4 protein/mRNA levels in gastric cancer tissues.
  • Experimental validation of miR-93 targeting PDCD4 using cell lines (overexpression/knockdown).
  • In vitro apoptosis assays and in vivo xenograft mouse models to assess tumor growth.

Main Results:

  • miR-93 was identified as a direct targeting miRNA of PDCD4.
  • An inverse correlation was observed between miR-93 and PDCD4 protein levels in gastric cancer tissues.
  • Overexpression of miR-93 suppressed PDCD4 expression, leading to reduced apoptosis in gastric cancer cells.
  • miR-93 promoted gastric tumor growth in vivo by negatively regulating PDCD4.

Conclusions:

  • miR-93 acts as an oncogenic factor in gastric cancer by targeting and downregulating the tumor suppressor PDCD4.
  • The miR-93/PDCD4 axis plays a critical role in regulating apoptosis and promoting gastric tumor development.
  • Targeting miR-93 may represent a potential therapeutic strategy for gastric cancer.

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