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Liang Y, Fan S, Jiang Y, Ji T, Chen R, Xu Q, Liu Y, Xiao Y, Cai H, Dai J. Elevated serum mitochondrial DNA levels were associated with the progression and mortality in idiopathic pulmonary fibrosis. Int Immunopharmacol 2023; 123:110754. [PMID: 37573686 DOI: 10.1016/j.intimp.2023.110754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 07/31/2023] [Accepted: 07/31/2023] [Indexed: 08/15/2023]
Abstract
Circulating mitochondrial DNA (mtDNA) was implicated in idiopathic pulmonary fibrosis (IPF), but the association between circulating mtDNA levels with clinical parameters in IPF was unclear. In this study, we investigate the relationship between serum mtDNA levels with the progression and mortality of IPF. Eighty-three patients with clinical diagnoses of IPF and fifty-three healthy controls were enrolled. Clinical data were collected and IPF patients were classified as stable disease (SD) and progressive disease (PD) based on the diagnostic criteria. Serum mtDNA levels were measured by real-time quantitative PCR and were compared between the two groups. Associations of the mtDNA levels with pulmonary function data and clinical parameters were assessed. Cox regression was performed to access the association between serum mtDNA levels with mortality in IPF. The serum mtDNA levels were significantly higher in IPF patients compared to those in healthy controls (P < 0.001), and further higher in patients with PD than those with SD (P < 0.001). Serum mtDNA levels were significantly inverse correlated with carbon monoxide diffusing capacity percent predicted (DLCO% predicted) (P = 0.030) and serum albumin levels (P = 0.008). During follow-up, 36 patients (43.4 %) died with a median survival of 46.00 (IQR: 25.00-69.75) months. Multivariate analysis showed that higher serum mtDNA levels were a significant predictor of mortality in IPF. In conclusion, elevated serum mtDNA levels were associated with the progression and mortality of IPF, which provided new insights that mitochondrial metabolism might have a potential role in the pathogenesis of IPF.
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Affiliation(s)
- Yi Liang
- Department of Pulmonary and Critical Care Medicine, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China
| | - Shiwen Fan
- Department of Pulmonary and Critical Care Medicine, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China
| | - Yuxian Jiang
- Department of Pulmonary and Critical Care Medicine, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China
| | - Tong Ji
- Department of Pulmonary and Critical Care Medicine, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Ranxun Chen
- Department of Pulmonary and Critical Care Medicine, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Qingqing Xu
- Department of Pulmonary and Critical Care Medicine, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Yin Liu
- Department of Pulmonary and Critical Care Medicine, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Yonglong Xiao
- Department of Pulmonary and Critical Care Medicine, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Hourong Cai
- Department of Pulmonary and Critical Care Medicine, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Jinghong Dai
- Department of Pulmonary and Critical Care Medicine, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China; Department of Pulmonary and Critical Care Medicine, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu, China.
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Mitochondrial Dysfunction in Chronic Respiratory Diseases: Implications for the Pathogenesis and Potential Therapeutics. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:5188306. [PMID: 34354793 PMCID: PMC8331273 DOI: 10.1155/2021/5188306] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 06/30/2021] [Accepted: 07/16/2021] [Indexed: 02/07/2023]
Abstract
Mitochondria are indispensable for energy metabolism and cell signaling. Mitochondrial homeostasis is sustained with stabilization of mitochondrial membrane potential, balance of mitochondrial calcium, integrity of mitochondrial DNA, and timely clearance of damaged mitochondria via mitophagy. Mitochondrial dysfunction is featured by increased generation of mitochondrial reactive oxygen species, reduced mitochondrial membrane potential, mitochondrial calcium imbalance, mitochondrial DNA damage, and abnormal mitophagy. Accumulating evidence indicates that mitochondrial dysregulation causes oxidative stress, inflammasome activation, apoptosis, senescence, and metabolic reprogramming. All these cellular processes participate in the pathogenesis and progression of chronic respiratory diseases, including chronic obstructive pulmonary disease, pulmonary fibrosis, and asthma. In this review, we provide a comprehensive and updated overview of the impact of mitochondrial dysfunction on cellular processes involved in the development of these respiratory diseases. This not only implicates mechanisms of mitochondrial dysfunction for the pathogenesis of chronic lung diseases but also provides potential therapeutic approaches for these diseases by targeting dysfunctional mitochondria.
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Fan Y, He R, Zou L, Meng J. [Clinical value of biomarkers in diagnosis and treatment of idiopathic pulmonary fibrosis]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2020; 40:1062-1065. [PMID: 32895164 DOI: 10.12122/j.issn.1673-4254.2020.07.23] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Idiopathic pulmonary fibrosis (IPF) is a chronic interstitial pneumonia characterized by progressive accumulation of fibroblastic foci and destruction of the alveolar structure. Due to an incomplete understanding of the mechanism of the occurrence and progression of IPF, currently no effective means have been available for its early screening or treatment. With a poor overall prognosis, the patients with IPF have a median survival of only 2-4 years. In recent years, several studies have confirmed that dozens of molecules are involved in the development of IPF and can be used as potential biomarkers. These biomarkers play important roles in early diagnosis (such as SP-D, MMP-7, and osteopontin), prognostic evaluation (such as telomerase length, KL-6, mtDNA, HSP-70, LOXL2, CXCL13, miRNA, ICAM-1, and CCL18), and guiding treatment of IPF (such as TOLLIP rs3750920 genotype, SAMS score, and SP-D), and also provide potential therapeutic targets (such as TERT, TERR, RTEC, and PARN).
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Affiliation(s)
- Yubin Fan
- Department of Respiratory and Critical Care Medicine, Xiangya Hospital; Organ Fibrosis Research Center, Central South University, Changsha 410008, China
| | - Rongling He
- Department of Respiratory and Critical Care Medicine, Xiangya Hospital; Organ Fibrosis Research Center, Central South University, Changsha 410008, China
| | - Lijun Zou
- Department of Respiratory and Critical Care Medicine, Xiangya Hospital; Organ Fibrosis Research Center, Central South University, Changsha 410008, China
| | - Jie Meng
- Department of Respiratory and Critical Care Medicine, Xiangya Hospital; Organ Fibrosis Research Center, Central South University, Changsha 410008, China
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Benmerzoug S, Ryffel B, Togbe D, Quesniaux VF. Self-DNA Sensing in Lung Inflammatory Diseases. Trends Immunol 2019; 40:719-734. [DOI: 10.1016/j.it.2019.06.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 05/31/2019] [Accepted: 06/04/2019] [Indexed: 02/07/2023]
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Detection of mitochondrial transfer RNA (mt-tRNA) gene mutations in patients with idiopathic pulmonary fibrosis and sarcoidosis. Mitochondrion 2018; 43:43-52. [PMID: 30473003 DOI: 10.1016/j.mito.2018.10.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Revised: 09/10/2018] [Accepted: 10/25/2018] [Indexed: 12/17/2022]
Abstract
Mitochondrial reactive oxygen species production may lead to tissue injury associated with two respiratory disorders of unknown origin which are shared by common tissue fibrosis, IPF and sarcoidosis. Sequence analysis of 22 mt-tRNA genes and parts of their flanking genes revealed 32 and 45 mutations in 38/40 IPF and 69/85 sarcoidosis patients respectively. 4 novel mutations were identified. 15/32 and 25/45 mutations were exclusively expressed while 12/32 and 17/45 mutations predominantly occurred in IPF and sarcoidosis group respectively, compared to healthy controls. Novel mutation combinations were solely expressed in disease. Hence, a mitochondrial-mediated pathogenic pathway seems to underlie both entities.
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