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Quantification of Monocyte Chemotactic Activity In Vivo and Characterization of Blood Monocyte Derived Macrophages
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Regulation of oxidative stress by methylation-controlled J protein controls macrophage responses to inflammatory

Nicolás Navasa1, Itziar Martín2, Juan Manuel Iglesias-Pedraz3

  • 1Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst Proteomics Unit.

The Journal of Infectious Diseases
|July 17, 2014
PubMed

Insights

Mitochondria regulate macrophage immune responses. The protein MCJ inhibits mitochondrial respiration, controlling tumor necrosis factor production and protecting against liver injury, highlighting its role in immunity.

Area of Science:

  • Immunology
  • Mitochondrial biology
  • Cellular metabolism

Background:

  • Mitochondria generate reactive oxygen species (ROS), impacting macrophage immune function.
  • MCJ (DnaJC15) is a mitochondrial inner membrane protein that inhibits respiratory chain complex I.

Purpose of the Study:

  • To investigate the role of MCJ in macrophage immune responses.
  • To elucidate the mechanism by which MCJ regulates inflammatory signaling.

Main Methods:

  • Macrophage cell culture and stimulation with Toll-like receptor ligands and bacteria.
  • Mitochondrial respiration assays and ROS measurements.
  • Analysis of inflammatory pathway activation (JNK/c-Jun) and cytokine shedding.
  • Assessment of liver injury in MCJ-deficient mice.

Main Results:

  • MCJ is essential for tumor necrosis factor (TNF) production by macrophages.
  • Loss of MCJ increases mitochondrial respiration and basal ROS levels.
  • MCJ deficiency leads to JNK/c-Jun pathway activation and TIMP-3 upregulation, inhibiting TNF shedding.
  • MCJ-deficient mice are resistant to lipopolysaccharide-induced liver injury.

Conclusions:

  • MCJ acts as a critical regulator of macrophage inflammatory responses.
  • MCJ's inhibition of mitochondrial respiration controls ROS production and subsequent inflammatory signaling.
  • MCJ plays a protective role against inflammatory liver injury by modulating macrophage TNF release.
Keywords:
MCJTACE activityTIMP-3TNF sheddingmacrophagereactive oxygen species

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