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Camptothecin induced DDX5 degradation increased the camptothecin resistance of osteosarcoma

Xingkai Zhao1, Miao Bao2, Fengmin Zhang3

  • 1Department of Orthopedic Surgery, the First Affiliated Hospital of Harbin Medical University, Harbin, China.

Experimental Cell Research
|June 26, 2020
PubMed

Insights

Osteosarcoma chemo-resistance is linked to DDX5 protein loss. Restoring DDX5 may improve camptothecin treatment effectiveness in bone cancer patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Osteosarcoma (OS) is a prevalent bone cancer in children and adolescents.
  • Chemo-resistance significantly hinders effective OS treatment.
  • The molecular basis of chemo-resistance in OS is not fully understood.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying chemo-resistance in osteosarcoma.
  • To identify potential therapeutic targets for overcoming camptothecin resistance in OS.

Main Methods:

  • Utilized 143B osteosarcoma cells.
  • Investigated the role of DDX5 protein in camptothecin (cpt) resistance.
  • Examined the interaction between DDX5 and NONO, a DNA repair protein.

Main Results:

  • Camptothecin (cpt) resistance in OS cells was associated with the degradation of DDX5.
  • Knockdown of DDX5 reduced cpt-induced cell death and DNA damage, enhancing cell proliferation.
  • DDX5 regulates the function of the DNA repair protein NONO, and its degradation disrupts this interaction, contributing to cpt resistance.

Conclusions:

  • DDX5 degradation is a key mechanism driving chemo-resistance to camptothecin in osteosarcoma.
  • DDX5 may serve as a potential therapeutic target to enhance camptothecin efficacy in OS treatment.
Keywords:
CamptothecinDDX5OsteosarcomaResistance

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