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RNA-binding protein PUM2 suppresses osteosarcoma progression via partly and competitively binding to STARD13 3'UTR

Ruixi Hu1, Xiaodong Zhu1, Chao Chen1

  • 1TongRen Hospital, School of Medicine, Shanghai JiaoTong University, Shanghai, China.

Cell Proliferation
|August 8, 2018
PubMed
Abstract

Insights

RNA binding protein PUM2 suppresses osteosarcoma (OS) progression by binding to STARD13 messenger RNA. This interaction, along with specific microRNAs, inhibits tumor cell proliferation, migration, and stemness, revealing a novel therapeutic target for OS.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • Osteosarcoma (OS) is a primary bone malignancy with limited treatment options.
  • Understanding the molecular mechanisms driving OS progression is crucial for developing targeted therapies.
  • RNA binding proteins (RBPs) play significant roles in post-transcriptional gene regulation, influencing cancer development.

Purpose of the Study:

  • To investigate the role of RNA binding protein PUM2 in osteosarcoma progression.
  • To elucidate the underlying molecular mechanisms by which PUM2 affects OS development.
  • To identify potential therapeutic targets for osteosarcoma treatment.

Main Methods:

  • Transcriptome analysis (RNA sequencing) and quantitative PCR (RT-qPCR) to assess gene expression in OS tissues.
  • Western blot analysis to detect protein levels of PUM2 and STARD13.
  • Cell-based assays (viability, migration, sphere formation) and in vivo tumor formation assays to evaluate PUM2 function.
  • RNA immunoprecipitation (RIP) and luciferase reporter assays to confirm direct binding interactions.

Main Results:

  • PUM2 and STARD13 expression were significantly decreased in OS tissues and showed a positive correlation.
  • Overexpression of PUM2 or STARD13 3' untranslated region (UTR) suppressed OS cell proliferation, migration, and stemness.
  • PUM2 was found to competitively bind to the STARD13 3'UTR with miR-590-3p and miR-9, thereby regulating STARD13 expression.

Conclusions:

  • PUM2 acts as a tumor suppressor in osteosarcoma.
  • PUM2 inhibits OS progression by competitively binding to the STARD13 3'UTR with specific microRNAs.
  • The PUM2/STARD13/miRNA axis represents a potential therapeutic strategy for osteosarcoma.

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