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JunD protects cells from p53-dependent senescence and apoptosis

J B Weitzman1, L Fiette, K Matsuo

  • 1Unite des Virus Oncogenes CNRS URA1644 Pasteur Institute, Paris, France.

Molecular Cell
|December 7, 2000
PubMed

Insights

JunD protein protects cells from premature aging and stress-induced cell death. Loss of JunD leads to growth arrest in primary cells but increased proliferation in immortalized cells, impacting Ras-p53 signaling.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • JunD is a widely expressed member of the Jun family and the Activator Protein-1 (AP-1) transcription factor complex.
  • The AP-1 complex plays critical roles in cellular processes including proliferation, differentiation, and apoptosis.

Purpose of the Study:

  • To investigate the role of JunD in cellular responses to stress, senescence, and oncogenic signaling.
  • To elucidate the relationship between JunD, Ras, and p53 pathways.

Main Methods:

  • Gene knockout studies in primary fibroblasts and immortalized cell lines.
  • Analysis of cell proliferation, senescence markers (p19Arf), apoptosis, and cell cycle regulators (cyclinD1).
  • In vivo studies using a mouse model of TNF-alpha-induced hepatitis.

Main Results:

  • Primary fibroblasts lacking JunD exhibited p53-dependent growth arrest, premature senescence, and increased apoptosis upon UV irradiation.
  • Immortalized cell lines lacking JunD showed increased proliferation and cyclin D1 levels, similar to oncogenic Ras expression.
  • JunD deficiency sensitized cells to TNF-alpha cytotoxicity, and JunD demonstrated an anti-apoptotic role in vivo.

Conclusions:

  • JunD acts as a crucial modulator of signaling pathways linking Ras to p53.
  • JunD protects cells against senescence and apoptosis in response to various stress stimuli.
  • These findings highlight JunD's role as a tumor suppressor by preventing aberrant proliferation and promoting cell survival under stress.

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