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2014 ; 20
(3
): 483-98
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Mitochondrial complex I activity suppresses inflammation and enhances bone
resorption by shifting macrophage-osteoclast polarization
#MMPMID25130399
Jin Z
; Wei W
; Yang M
; Du Y
; Wan Y
Cell Metab
2014[Sep]; 20
(3
): 483-98
PMID25130399
show ga
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.