Abstract
Summary Mitochondrial complex I (CI) deficiency is associated with multiple neurological and metabolic disorders. However, its effect on innate immunity and bone remodeling is unclear. Using deletion of the essential CI subunit Ndufs4 as a model for mitochondrial dysfunction, we report that mitochondria suppress macrophage activation and inflammation while promoting osteoclast differentiation and bone resorption via both cell-autonomous and systemic regulation. Global Ndufs4 deletion causes systemic inflammation and osteopetrosis. Hematopoietic Ndufs4 deletion causes an intrinsic lineage shift from osteoclast to macrophage. Liver Ndufs4 deletion causes a metabolic shift from fatty acid oxidation to glycolysis, accumulating fatty acids and lactate (FA/LAC) in the circulation. FA/LAC further activates Ndufs4-/- macrophages via reactive oxygen species induction and diminishes osteoclast lineage commitment in Ndufs4-/- progenitors; both inflammation and osteopetrosis in Ndufs4-/- mice are attenuated by TLR4/2 deletion. Together, these findings reveal mitochondrial CI as a critical rheostat of innate immunity and skeletal homeostasis.
Original language | English (US) |
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Pages (from-to) | 483-498 |
Number of pages | 16 |
Journal | Cell Metabolism |
Volume | 20 |
Issue number | 3 |
DOIs | |
State | Published - Sep 2 2014 |
ASJC Scopus subject areas
- Physiology
- Molecular Biology
- Cell Biology