MicroRNA-431-5p Inhibits the Tumorigenesis of Osteosarcoma Through Targeting PANX3

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An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells
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An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells

Published on: May 21, 2019

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Shengliang Sun1, Lei Fu1, Gen Wang1

  • 1Department of Orthopedic Trauma, The 89th Army Hospital of the Chinese People's Liberation Army, Weifang, Shandong, People's Republic of China.

Cancer Management and Research
|September 28, 2020
PubMed
Abstract

Insights

MicroRNA-431-5p (miR-431-5p) suppresses osteosarcoma (OS) growth by targeting pannexin 3 (PANX3). Upregulating miR-431-5p inhibits OS cell proliferation, migration, and invasion, offering a potential therapeutic strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Osteosarcoma (OS) is a primary bone malignancy with significant metastatic potential.
  • MicroRNAs (miRNAs) play crucial roles in cancer development and progression.
  • Dysregulation of specific miRNAs, like miR-431-5p, is implicated in OS tumorigenesis.

Purpose of the Study:

  • To investigate the regulatory function of miR-431-5p in osteosarcoma.
  • To elucidate the mechanism by which miR-431-5p affects OS, focusing on its interaction with pannexin 3 (PANX3).

Main Methods:

  • Quantitative real-time PCR (qRT-PCR) to assess miR-431-5p expression in OS tissues and cells.
  • In vitro assays (MTT, Transwell) to evaluate cell viability, apoptosis, migration, and invasion following miR-431-5p and PANX3 manipulation.
  • Western blot analysis for key proteins (cleave-caspase-3, MMP-2/-9).
  • Dual-luciferase reporter (DLR) assay to confirm the direct targeting of PANX3 by miR-431-5p.
  • In vivo xenograft mouse model to assess the anti-tumor efficacy of miR-431-5p.

Main Results:

  • miR-431-5p was significantly downregulated in OS tissues and correlated with advanced tumor stage and lymph node metastasis.
  • Overexpression of miR-431-5p inhibited OS cell proliferation, migration, and invasion, while promoting apoptosis.
  • miR-431-5p overexpression led to increased cleave-caspase-3 and decreased MMP-2/-9 levels.
  • PANX3 was confirmed as a direct target of miR-431-5p, and its overexpression reversed the anti-tumor effects of miR-431-5p.
  • In vivo studies demonstrated that miR-431-5p suppressed tumor growth in a xenograft model.

Conclusions:

  • miR-431-5p acts as a tumor suppressor in osteosarcoma.
  • The anti-tumorigenic effects of miR-431-5p are mediated through the inhibition of its target gene, PANX3.
  • miR-431-5p represents a potential therapeutic target for osteosarcoma treatment.
Keywords:
microRNA-431-5pmigrationosteosarcomapannexin 3proliferation

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