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FTH1 binds to Daxx and inhibits Daxx-mediated cell apoptosis

Fang Liu1, Zhi-Yin Du, Jun-Lin He

  • 1Department of Clinical Laboratory, the First People's Hospital in Jiangbei District, Chongqing 400020, China.

Molecular Biology Reports
|May 17, 2011
PubMed

Insights

Death domain-associated protein (Daxx) interacts with ferritin (FTH1), influencing apoptosis. FTH1 inhibits Daxx-induced apoptosis by modulating the JNK signaling pathway, revealing a novel regulatory mechanism in cell death.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Death domain-associated protein (Daxx) is a conserved nuclear protein involved in transcriptional control, carcinogenesis, and viral infection resistance.
  • Understanding Daxx's molecular mechanisms is crucial for elucidating its roles in various cellular processes.

Purpose of the Study:

  • To identify intracellular proteins interacting with Daxx.
  • To investigate the functional relationship between Daxx and its interacting partners in apoptosis regulation.

Main Methods:

  • Yeast two-hybrid screening to identify Daxx-interacting proteins.
  • GST pull-down and co-immunoprecipitation assays to confirm protein interactions.
  • Apoptosis assays and signaling pathway analysis (Fas-Daxx-ASK1-JNK1).

Main Results:

  • Identified ferritin, heavy polypeptide 1 (FTH1) as a Daxx-interacting protein.
  • Demonstrated that Daxx induces apoptosis, while FTH1 inhibits this process.
  • Elucidated that Daxx mediates apoptosis via the Fas-Daxx-ASK1-JNK1 pathway.
  • Showed that FTH1 inhibits Daxx-mediated apoptosis by suppressing JNK signaling pathway activation.

Conclusions:

  • Ferritin (FTH1) directly interacts with Daxx and modulates its pro-apoptotic function.
  • FTH1 acts as an inhibitor of Daxx-induced apoptosis through the JNK signaling pathway.
  • This study reveals a novel mechanism of apoptosis regulation involving the Daxx-FTH1 interaction.

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