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The germline factor DDX4 contributes to the chemoresistance of small cell lung cancer cells

Christopher Noyes1, Shunsuke Kitajima2,3, Fengkai Li4

  • 1Department of Molecular Biology Cell Biology Biochemistry, Brown University, 185 Meeting Street, BOX-GL277, Providence, RI, 02912, USA.

Communications Biology
|January 18, 2023
PubMed

Insights

DEAD-box helicase 4 (DDX4) promotes small cell lung cancer (SCLC) progression and cisplatin resistance. This germline factor enhances cell motility and tumor growth by upregulating DNA repair and immune pathways, correlating with decreased patient survival.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Human cancers can re-express germline factors, but their roles in oncogenesis are unclear.
  • DEAD-box helicase 4 (DDX4), a conserved RNA helicase, is a germline factor implicated in cancer.

Purpose of the Study:

  • To investigate the mechanistic role of DDX4 in small cell lung cancer (SCLC) progression.
  • To determine DDX4's impact on cell motility, drug resistance, and tumor development in SCLC.

Main Methods:

  • Proteomic analysis of DDX4-expressing SCLC cells.
  • In vitro studies on cell motility and cisplatin resistance.
  • In vivo tumor development studies in nude mice.
  • Correlation analysis of DDX4 expression with patient survival and immune markers.

Main Results:

  • DDX4 expression increased SCLC cell motility and cisplatin resistance.
  • Proteomic analysis revealed DDX4 upregulates DNA repair and immune/inflammatory response proteins.
  • DDX4 depletion inhibited tumor growth in vivo, while overexpression enhanced it, even post-cisplatin treatment.
  • Higher DDX4 expression in SCLC patients correlated with decreased survival and increased immune markers.

Conclusions:

  • DDX4 promotes SCLC cell survival and tumor growth, particularly under cisplatin treatment.
  • DDX4 enhances SCLC progression by activating DNA damage and immune response pathways.
  • DDX4 represents a potential therapeutic target for improving SCLC patient outcomes.

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