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Mitochondrial complex I activity suppresses inflammation and enhances bone resorption by shifting

Zixue Jin1, Wei Wei1, Marie Yang1

  • 1Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Cell Metabolism
|August 19, 2014
PubMed

Insights

Mitochondrial complex I (CI) deficiency impacts innate immunity and bone health. Our study shows mitochondria regulate macrophage activation and osteoclast function, revealing CI as key to immune and skeletal balance.

Area of Science:

  • Immunology
  • Metabolism
  • Skeletal Biology

Background:

  • Mitochondrial complex I (CI) deficiency is linked to neurological and metabolic diseases.
  • Its role in innate immunity and bone remodeling remains largely unknown.

Purpose of the Study:

  • To investigate the impact of mitochondrial dysfunction, specifically CI deficiency, on innate immunity and bone homeostasis.
  • To elucidate the mechanisms by which mitochondria regulate macrophage and osteoclast function.

Main Methods:

  • Utilized Ndufs4 deletion in mice as a model for CI deficiency.
  • Analyzed systemic inflammation, osteoclast differentiation, and macrophage activation.
  • Investigated metabolic shifts and the role of fatty acids/lactate (FA/LAC) and Toll-like receptors (TLR4/2).

Main Results:

  • Global Ndufs4 deletion led to systemic inflammation and osteopetrosis.
  • Hematopoietic Ndufs4 deletion caused a shift from osteoclasts to macrophages.
  • Liver Ndufs4 deletion induced metabolic changes, increasing circulating FA/LAC, which activated macrophages and impaired osteoclast commitment, findings partially reversed by TLR4/2 deletion.

Conclusions:

  • Mitochondrial CI plays a crucial role in suppressing macrophage activation and promoting osteoclast differentiation.
  • Mitochondrial dysfunction disrupts innate immunity and skeletal homeostasis through cell-autonomous and systemic effects.
  • CI acts as a critical regulator of innate immunity and skeletal health.

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