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Critical role for transcription factor C/EBP-beta in regulating the expression of death-associated protein kinase 1

Padmaja Gade1, Sanjit K Roy, Hui Li

  • 1Department of Microbiology and Immunology, University of Maryland School of Medicine, 660 West Redwood St., Howard Hall 350, Baltimore, MD 21201, USA. dkalvako@umaryland.edu

Molecular and Cellular Biology
|February 6, 2008
PubMed

Insights

Transcription factor C/EBP-beta is crucial for interferon-gamma-induced apoptosis. This study reveals a new pathway where C/EBP-beta regulates death-associated protein kinase 1 (DAPK1) expression, mediating cellular responses to interferons.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Interferons (IFNs) induce physiological responses, including growth suppression.
  • The transcription factor C/EBP-beta plays a role in various cellular processes.
  • IFN-gamma typically induces apoptosis in wild-type cells but not in cebpb(-/-) cells.

Purpose of the Study:

  • To investigate the role of C/EBP-beta in IFN-gamma-mediated apoptosis.
  • To identify IFN-gamma-regulated genes dependent on C/EBP-beta.
  • To elucidate the molecular mechanism linking C/EBP-beta, IFN-gamma, and apoptosis.

Main Methods:

  • Gene expression profiling of wild-type and cebpb(-/-) bone marrow macrophages.
  • Site-directed mutagenesis, RNA interference, and chromatin immunoprecipitation assays.
  • Analysis of promoter regions and protein-DNA interactions.

Main Results:

  • C/EBP-beta is essential for IFN-gamma-induced apoptosis, distinct from JAK-STAT pathways.
  • C/EBP-beta directly binds to the promoter of death-associated protein kinase 1 (DAPK1), regulating its expression.
  • IFN-gamma-dependent C/EBP-beta binding to the DAPK1 promoter involves ERK1/2 signaling.

Conclusions:

  • C/EBP-beta mediates a novel IFN-induced cell growth-suppressive pathway through DAPK1.
  • DAPK1 is a key regulator of cell cycle, apoptosis, and metastasis, controlled by C/EBP-beta.
  • This finding highlights a new mechanism for interferon signaling in cellular regulation.

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