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Prohibitin 1 modulates mitochondrial function of Stat3.

Jie Han1, Chunhua Yu2, Rhonda F Souza2

  • 1Department of Internal Medicine, Division of Gastroenterology, Baylor Research Institute, Baylor University Medical Center, Dallas, TX, United States.

Cellular Signalling
|July 1, 2014
PubMed
Summary
This summary is machine-generated.

Prohibitin 1 (PHB) protects intestinal cells from inflammatory stress by interacting with phosphorylated Signal Transducer and Activator of Transcription 3 (pS727-Stat3) in mitochondria. Reduced PHB levels may contribute to mitochondrial dysfunction in inflammatory bowel diseases (IBD).

Keywords:
Electron transport chainIntestinal epitheliumMitochondriaOxidative stressProhibitinStat3

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Area of Science:

  • Cell Biology
  • Gastroenterology
  • Mitochondrial Biology

Background:

  • Mitochondrial dysfunction in intestinal epithelial cells (IECs) is implicated in inflammatory bowel diseases (IBD).
  • Prohibitin 1 (PHB) is a mitochondrial protein crucial for electron transport chain (ETC) activity, with decreased expression observed in IBD.
  • Signal Transducer and Activator of Transcription 3 (Stat3) localizes to mitochondria, where S727 phosphorylation is vital for ETC function and protection against stress.

Purpose of the Study:

  • To investigate the protective role of Prohibitin 1 (PHB) against TNFα-induced mitochondrial stress and apoptosis in IECs.
  • To determine if the protective effects of PHB are dependent on phosphorylated Signal Transducer and Activator of Transcription 3 (pS727-Stat3).
  • To explore the interaction between PHB and pS727-Stat3 in the mitochondria of IECs and colonic epithelium.

Main Methods:

  • Overexpression of PHB in cultured IECs.
  • Induction of mitochondrial stress and apoptosis using TNFα.
  • Expression of a dominant-negative pS727-Stat3 mutant.
  • Co-immunoprecipitation to assess protein interactions in cultured IECs and mouse colonic epithelium.

Main Results:

  • PHB overexpression protected cultured IECs against TNFα-induced mitochondrial stress and apoptosis.
  • The protective effect of PHB was abolished by the expression of a dominant-negative pS727-Stat3 mutant.
  • PHB was found to interact with pS727-Stat3 within the mitochondria of IECs and in mouse colonic epithelium.

Conclusions:

  • PHB exerts a protective role against mitochondrial dysfunction in IECs, mediated through its interaction with pS727-Stat3.
  • Reduced PHB levels in the context of IBD may contribute to the observed mitochondrial dysfunction in the intestinal epithelium.
  • This study highlights a novel mechanism involving PHB and pS727-Stat3 in maintaining intestinal epithelial health.