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2016 ; 213
(5
): 697-713
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Oxidized mitochondrial nucleoids released by neutrophils drive type I interferon
production in human lupus
#MMPMID27091841
Caielli S
; Athale S
; Domic B
; Murat E
; Chandra M
; Banchereau R
; Baisch J
; Phelps K
; Clayton S
; Gong M
; Wright T
; Punaro M
; Palucka K
; Guiducci C
; Banchereau J
; Pascual V
J Exp Med
2016[May]; 213
(5
): 697-713
PMID27091841
show ga
Autoantibodies against nucleic acids and excessive type I interferon (IFN) are
hallmarks of human systemic lupus erythematosus (SLE). We previously reported
that SLE neutrophils exposed to TLR7 agonist autoantibodies release
interferogenic DNA, which we now demonstrate to be of mitochondrial origin. We
further show that healthy human neutrophils do not complete mitophagy upon
induction of mitochondrial damage. Rather, they extrude mitochondrial components,
including DNA (mtDNA), devoid of oxidized (Ox) residues. When mtDNA undergoes
oxidation, it is directly routed to lysosomes for degradation. This rerouting
requires dissociation from the transcription factor A mitochondria (TFAM), a dual
high-mobility group (HMG) protein involved in maintenance and compaction of the
mitochondrial genome into nucleoids. Exposure of SLE neutrophils, or healthy
IFN-primed neutrophils, to antiribonucleotide protein autoantibodies blocks TFAM
phosphorylation, a necessary step for nucleoid dissociation. Consequently, Ox
nucleoids accumulate within mitochondria and are eventually extruded as potent
interferogenic complexes. In support of the in vivo relevance of this phenomenon,
mitochondrial retention of Ox nucleoids is a feature of SLE blood neutrophils,
and autoantibodies against Ox mtDNA are present in a fraction of patients. This
pathway represents a novel therapeutic target in human SLE.