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BNip3 is a mediator of TNF-induced necrotic cell death

Jee-Youn Kim1, Yong-Jun Kim, Sun Lee

  • 1Department of Pathology and Medical Science and Engineering Research Center for Bioreaction to Reactive Oxygen Species, School of Medicine, Kyung Hee University, Seoul 130-701, Korea.

Apoptosis : an International Journal on Programmed Cell Death
|October 22, 2010
PubMed

Insights

Tumor necrosis factor (TNF) upregulates the pro-death protein BNip3 in lung cells, influencing necroptosis sensitivity. BNip3, essential for TNF-induced cell death, presents a potential therapeutic target for tissue damage.

Area of Science:

  • Cellular biology
  • Immunology
  • Molecular mechanisms of cell death

Background:

  • Tumor necrosis factor (TNF) is a key cytokine regulating immune responses, inflammation, and cell death.
  • TNF initiates distinct cell death pathways, including apoptosis and necroptosis.
  • The precise molecular players in TNF-mediated cell death beyond well-known pathways require further elucidation.

Purpose of the Study:

  • To investigate the role of BNip3 in TNF-induced cell death pathways in A549 alveolar epithelial cells.
  • To determine if BNip3 expression influences sensitivity to TNF-induced necroptosis.
  • To explore the involvement of reactive oxygen species (ROS) in BNip3-mediated mitochondrial damage.

Main Methods:

  • Utilized A549 alveolar epithelial cells.
  • Analyzed transcriptional and translational upregulation of BNip3 by TNF.
  • Assessed the impact of BNip3 expression on TNF-induced apoptosis and necroptosis.
  • Investigated the role of ROS in BNip3 mitochondrial localization.

Main Results:

  • TNF induces both transcriptional and translational upregulation of BNip3 in lung alveolar cells.
  • BNip3 expression levels correlate with sensitivity to TNF-induced necroptosis.
  • BNip3 is not implicated in TNF-induced caspase-8/Bid-dependent apoptosis.
  • Reactive oxygen species (ROS) generation is crucial for BNip3 mitochondrial translocation and subsequent cell death.

Conclusions:

  • BNip3 is a TNF-inducible protein that modulates necroptosis in lung epithelial cells.
  • The generation of ROS is essential for BNip3-mediated mitochondrial catastrophe.
  • BNip3 represents a potential therapeutic target for conditions involving TNF-driven tissue damage.

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