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DDX21 Controls Cell Cycle Progression and Autophagy in Pancreatic Cancer Cells.

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Helicase DDX21 promotes pancreatic ductal adenocarcinoma (PDAC) growth and metastasis. Inhibiting DDX21 reduces PDAC cell proliferation and alters cell cycle and autophagy, suggesting DDX21 as a therapeutic target.

Keywords:
autophagycell cyclepancreatic ductal adenocarcinoma

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Pancreatic ductal adenocarcinoma (PDAC) has a poor prognosis due to late diagnosis and chemoresistance.
  • Surgical resection is only an option for ~20% of patients, highlighting the need for novel therapeutic strategies.
  • The helicase DDX21 has emerged as a potential prognostic marker in various cancers, including PDAC.

Purpose of the Study:

  • To investigate the role of DDX21 in PDAC progression.
  • To explore the functional impact of DDX21 depletion on PDAC cells.
  • To identify potential therapeutic targets for PDAC management.

Main Methods:

  • Assessed DDX21 expression in PDAC samples and cell lines.
  • Performed RNA sequencing and bioinformatics analysis on DDX21-depleted PANC-1 cells.
  • Conducted functional assays for autophagy, cell cycle, and proliferation.

Main Results:

  • DDX21 expression is elevated in PDAC liver metastases.
  • DDX21 depletion led to enrichment of genes involved in autophagy and cell cycle progression.
  • Inactivation of DDX21 enhanced autophagic flux, altered G1-S cell cycle transition, and reduced PDAC cell proliferation and clonogenic activity.

Conclusions:

  • DDX21 plays an oncogenic role in PDAC.
  • DDX21 is implicated in the regulation of basal autophagy in PDAC.
  • Targeting DDX21 may offer a new therapeutic avenue for PDAC treatment.