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MiR-25-3p Serves as an Oncogenic MicroRNA by Downregulating the Expression of Merlin in Osteosarcoma

Hua-Chun Rao1, Zhao-Ke Wu1, Si-da Wei1

  • 1Quanzhou Orthopedic-Traumatological Hospital, Fengze District, Quanzhou, Fujian, People's Republic of China.

Cancer Management and Research
|October 16, 2020
PubMed
Abstract

Insights

MicroRNA-25-3p (miR-25-3p) promotes osteosarcoma progression by suppressing the tumor suppressor Merlin (Moesin-ezrin-radixin-like protein). Targeting this miR-25-3p/Merlin axis offers a potential therapeutic strategy for osteosarcoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Moesin-ezrin-radixin-like protein (Merlin) acts as a tumor suppressor in various cancers, but its role in osteosarcoma is not well understood.
  • MicroRNAs (miRNAs) are key regulators of gene expression and play significant roles in cancer development and progression.

Purpose of the Study:

  • To investigate the regulatory relationship between miR-25-3p and Merlin in osteosarcoma.
  • To elucidate the functional role of the miR-25-3p/Merlin axis in osteosarcoma progression.
  • To assess the potential of this axis as a therapeutic target for osteosarcoma.

Main Methods:

  • Analysis of The Cancer Genome Atlas (TCGA) database for Merlin expression and patient prognosis.
  • RT-qPCR and Western blotting to quantify Merlin expression in normal and osteosarcoma cells.
  • Dual-luciferase reporter assays to confirm direct targeting of Merlin by miR-25-3p.
  • In vitro functional assays (cell growth, migration, invasion, apoptosis, cell cycle) in osteosarcoma cell lines with manipulated miR-25-3p and Merlin levels.

Main Results:

  • Low Merlin expression correlated with poor osteosarcoma prognosis.
  • miR-25-3p directly targets and downregulates Merlin expression.
  • miR-25-3p promotes osteosarcoma cell growth, migration, and invasion, while inhibiting cisplatin-induced apoptosis.
  • Overexpression of Merlin counteracted the oncogenic effects of miR-25-3p.
  • The miR-25-3p/Merlin axis influences the Hippo pathway and regulates downstream genes like BIRC5, CTGF, and CYR61.

Conclusions:

  • miR-25-3p acts as an oncogenic miRNA in osteosarcoma by targeting the tumor suppressor Merlin.
  • The miR-25-3p/Merlin pathway is a critical regulator of osteosarcoma progression.
  • Targeting the miR-25-3p/Merlin axis presents a promising therapeutic strategy for osteosarcoma.
Keywords:
MerlinapoptosismetastasismiR-25-3posteosarcomaproliferation

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