Urinary Mitochondrial DNA Identifies Renal Dysfunction and Mitochondrial Damage in Sepsis-Induced Acute Kidney Injury
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 m...
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doaj-e1121aed8e154e83ab0ebb88c718cff32020-11-24T23:13:29ZengHindawi LimitedOxidative Medicine and Cellular Longevity1942-09001942-09942018-01-01201810.1155/2018/80749368074936Urinary Mitochondrial DNA Identifies Renal Dysfunction and Mitochondrial Damage in Sepsis-Induced Acute Kidney InjuryQiongyuan Hu0Jianan Ren1Huajian Ren2Jie Wu3Xiuwen Wu4Song Liu5Gefei Wang6Guosheng Gu7Kun Guo8Jieshou Li9Department of Surgery, Jinling Hospital, Nanjing University Medical School, Nanjing, ChinaDepartment of Surgery, Jinling Hospital, Nanjing University Medical School, Nanjing, ChinaDepartment of Surgery, Jinling Hospital, Nanjing University Medical School, Nanjing, ChinaDepartment of Surgery, Jinling Hospital, Nanjing University Medical School, Nanjing, ChinaDepartment of Surgery, Jinling Hospital, Nanjing University Medical School, Nanjing, ChinaDepartment of General Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, ChinaDepartment of Surgery, Jinling Hospital, Nanjing University Medical School, Nanjing, ChinaDepartment of Surgery, Jinling Hospital, Nanjing University Medical School, Nanjing, ChinaDepartment of Surgery, Jinling Hospital, Nanjing University Medical School, Nanjing, ChinaDepartment of Surgery, Jinling Hospital, Nanjing University Medical School, Nanjing, ChinaBackground. 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.http://dx.doi.org/10.1155/2018/8074936 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Qiongyuan Hu Jianan Ren Huajian Ren Jie Wu Xiuwen Wu Song Liu Gefei Wang Guosheng Gu Kun Guo Jieshou Li |
spellingShingle |
Qiongyuan Hu Jianan Ren Huajian Ren Jie Wu Xiuwen Wu Song Liu Gefei Wang Guosheng Gu Kun Guo Jieshou Li Urinary Mitochondrial DNA Identifies Renal Dysfunction and Mitochondrial Damage in Sepsis-Induced Acute Kidney Injury Oxidative Medicine and Cellular Longevity |
author_facet |
Qiongyuan Hu Jianan Ren Huajian Ren Jie Wu Xiuwen Wu Song Liu Gefei Wang Guosheng Gu Kun Guo Jieshou Li |
author_sort |
Qiongyuan Hu |
title |
Urinary Mitochondrial DNA Identifies Renal Dysfunction and Mitochondrial Damage in Sepsis-Induced Acute Kidney Injury |
title_short |
Urinary Mitochondrial DNA Identifies Renal Dysfunction and Mitochondrial Damage in Sepsis-Induced Acute Kidney Injury |
title_full |
Urinary Mitochondrial DNA Identifies Renal Dysfunction and Mitochondrial Damage in Sepsis-Induced Acute Kidney Injury |
title_fullStr |
Urinary Mitochondrial DNA Identifies Renal Dysfunction and Mitochondrial Damage in Sepsis-Induced Acute Kidney Injury |
title_full_unstemmed |
Urinary Mitochondrial DNA Identifies Renal Dysfunction and Mitochondrial Damage in Sepsis-Induced Acute Kidney Injury |
title_sort |
urinary mitochondrial dna identifies renal dysfunction and mitochondrial damage in sepsis-induced acute kidney injury |
publisher |
Hindawi Limited |
series |
Oxidative Medicine and Cellular Longevity |
issn |
1942-0900 1942-0994 |
publishDate |
2018-01-01 |
description |
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. |
url |
http://dx.doi.org/10.1155/2018/8074936 |
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