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2018 ; 2018
(ä): 8074936
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Urinary Mitochondrial DNA Identifies Renal Dysfunction and Mitochondrial Damage
in Sepsis-Induced Acute Kidney Injury
#MMPMID29682165
Hu Q
; Ren J
; Ren H
; Wu J
; Wu X
; Liu S
; Wang G
; Gu G
; Guo K
; Li J
Oxid Med Cell Longev
2018[]; 2018
(ä): 8074936
PMID29682165
show ga
BACKGROUND: Recent animal studies have shown that mitochondrial dysfunction
initiates and accelerates renal injury in sepsis, but its role in sepsis remains
unknown. Mitochondrial stress or dying cells can lead to fragmentation of the
mitochondrial genome, which is considered a surrogate marker of mitochondrial
dysfunction. Therefore, we evaluated the efficiency of urinary mitochondrial DNA
(UmtDNA) as a marker of renal dysfunction during sepsis-induced acute kidney
injury (AKI). METHODS: We isolated DNA from plasma and urine of patients. mtDNA
levels were quantified by quantitative PCR. Sepsis patients were divided into no
AKI, mild AKI, and severe AKI groups according to RIFLE criteria. Additionally,
cecal ligation and puncture (CLP) was established in rats to evaluate the
association between UmtDNA and mitochondrial function. RESULTS: A total of 52
(49.5%) developed AKI among enrolled sepsis patients. Increased systemic mtDNA
did not correlate with systemic inflammation or acute renal dysfunction in sepsis
patients, while AKI did not have an additional effect on circulating mtDNA
levels. In contrast, UmtDNA was significantly enriched in severe AKI patients
compared with that in the mild AKI or no AKI group, positively correlated with
plasma creatinine, urinary neutrophil gelatinase-associated lipocalin, and kidney
injury molecule-1, and inversely with the estimated glomerular filtration rate.
Additionally, UmtDNA increased in rats following CLP-induced sepsis. UmtDNA was
predictive of AKI development and correlated with plasma creatinine and blood
urea nitrogen in the rat sepsis model. Finally, the UmtDNA level was inversely
correlated with the cortical mtDNA copy number and relative expression of
mitochondrial gene in the kidney. CONCLUSION: An elevated UmtDNA level correlates
with mitochondrial dysfunction and renal injury in sepsis patients, indicating
renal mitochondrial injury induced by sepsis. Therefore, UmtDNA may be regarded
as a valuable biomarker for the occurrence of AKI and the development of
mitochondria-targeted therapies following sepsis-induced AKI.