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Wang S, Song Y, Wang Z, Chang X, Wu H, Yan Z, Wu J, He Z, Kang L, Hu W, Xia T, Li Z, Ren X, Bai Y. Neutrophil-derived PAD4 induces citrullination of CKMT1 exacerbates mucosal inflammation in inflammatory bowel disease. Cell Mol Immunol 2024; 21:620-633. [PMID: 38720063 PMCID: PMC11143373 DOI: 10.1038/s41423-024-01158-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 03/21/2024] [Indexed: 06/02/2024] Open
Abstract
Peptidyl arginine deiminase 4 (PAD4) plays a pivotal role in infection and inflammatory diseases by facilitating the formation of neutrophil extracellular traps (NETs). However, the substrates of PAD4 and its exact role in inflammatory bowel disease (IBD) remain unclear. In this study, we employed single-cell RNA sequencing (scRNA-seq) and substrate citrullination mapping to decipher the role of PAD4 in intestinal inflammation associated with IBD. Our results demonstrated that PAD4 deficiency alleviated colonic inflammation and restored intestinal barrier function in a dextran sulfate sodium (DSS)-induced colitis mouse model. scRNA-seq analysis revealed significant alterations in intestinal cell populations, with reduced neutrophil numbers and changes in epithelial subsets upon PAD4 deletion. Gene expression analysis highlighted pathways related to inflammation and epithelial cell function. Furthermore, we found that neutrophil-derived extracellular vesicles (EVs) carrying PAD4 were secreted into intestinal epithelial cells (IECs). Within IECs, PAD4 citrullinates mitochondrial creatine kinase 1 (CKMT1) at the R242 site, leading to reduced CKMT1 protein stability via the autophagy pathway. This action compromises mitochondrial homeostasis, impairs intestinal barrier integrity, and induces IECs apoptosis. IEC-specific depletion of CKMT1 exacerbated intestinal inflammation and apoptosis in mice with colitis. Clinical analysis of IBD patients revealed elevated levels of PAD4, increased CKMT1 citrullination, and decreased CKMT1 expression. In summary, our findings highlight the crucial role of PAD4 in IBD, where it modulates IECs plasticity via CKMT1 citrullination, suggesting that PAD4 may be a potential therapeutic target for IBD.
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Affiliation(s)
- Shuling Wang
- National Clinical Research Center for Digestive Diseases, Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- National Key Laboratory of Immunology and Inflammation, Naval Medical University, Shanghai, 200433, China
- Changhai Clinical Research Unit, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- Institute of Immunology and the CAS Key Laboratory of Innate Immunity and Chronic Disease, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230027, China
| | - Yihang Song
- National Clinical Research Center for Digestive Diseases, Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- National Key Laboratory of Immunology and Inflammation, Naval Medical University, Shanghai, 200433, China
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
| | - Zhijie Wang
- National Clinical Research Center for Digestive Diseases, Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
| | - Xin Chang
- National Clinical Research Center for Digestive Diseases, Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- National Key Laboratory of Immunology and Inflammation, Naval Medical University, Shanghai, 200433, China
| | - Haicong Wu
- National Clinical Research Center for Digestive Diseases, Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- National Key Laboratory of Immunology and Inflammation, Naval Medical University, Shanghai, 200433, China
| | - Ziwei Yan
- National Key Laboratory of Immunology and Inflammation, Naval Medical University, Shanghai, 200433, China
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
| | - Jiayi Wu
- National Key Laboratory of Immunology and Inflammation, Naval Medical University, Shanghai, 200433, China
| | - Zixuan He
- Changhai Clinical Research Unit, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
| | - Le Kang
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
| | - Wenjun Hu
- National Key Laboratory of Immunology and Inflammation, Naval Medical University, Shanghai, 200433, China
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
| | - Tian Xia
- National Clinical Research Center for Digestive Diseases, Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- Changhai Clinical Research Unit, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China
| | - Zhaoshen Li
- National Clinical Research Center for Digestive Diseases, Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China.
- National Key Laboratory of Immunology and Inflammation, Naval Medical University, Shanghai, 200433, China.
- Changhai Clinical Research Unit, Changhai Hospital, Naval Medical University, Shanghai, 200433, China.
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China.
| | - Xingxing Ren
- Institute of Immunology and the CAS Key Laboratory of Innate Immunity and Chronic Disease, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230027, China.
| | - Yu Bai
- National Clinical Research Center for Digestive Diseases, Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China.
- National Key Laboratory of Immunology and Inflammation, Naval Medical University, Shanghai, 200433, China.
- Changhai Clinical Research Unit, Changhai Hospital, Naval Medical University, Shanghai, 200433, China.
- Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China.
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2
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Jin L, Han Z, Jiang Z, Lu J, Wu Y, Yan B, Zhang W, Lin X, Jiang L, Zhao P, Sun K. Integrated genomic analysis identifies novel low-frequency cis-regulatory variant rs2279658 associated with VSD risk in Chinese children. Front Cell Dev Biol 2022; 10:1062403. [PMID: 36568976 PMCID: PMC9773552 DOI: 10.3389/fcell.2022.1062403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 11/21/2022] [Indexed: 12/13/2022] Open
Abstract
VSD combined with other cardiac or extracardiac malformations (defined as "complex VSD" by us) is one of the major causes of perinatal morbidity and mortality. Functional non-coding SNPs (cis-regulatory SNPs) have not been systematically studied in CHDs, including complex VSD. Here we report an exome-wide association analysis using WES data of 60 PA/VSD cases, 20 TOF cases and 100 controls in Chinese children. We identify 93 low-frequency non-coding SNPs associated with complex VSD risk. A functional genomics pipeline integrating ATAC-seq, ChIP-seq and promoter CHi-C recognizes the rs2279658 variant as a candidate cis-regulatory SNP. Specifically, rs2279658 resides in a cardiac-specific enhancer bound by FOXH1 and PITX2, and would abrogate binding of these two transcription factors to the identified enhancer during cardiac morphogenesis. COQ2 and FAM175A are predicted to be target genes for "rs2279658-FOXH1 or PITX2" pairs in the heart. These findings highlight the importance of cis-regulatory SNPs in the pathogenesis of complex VSD and broaden our understanding of this disease.
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Affiliation(s)
- Lihui Jin
- Department of Pediatric Cardiology, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Zhenyuan Han
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China
| | - Zhongli Jiang
- Department of Statistics, College of Science, Purdue University, West Lafayette, IN, United States
| | - Jieru Lu
- Department of Pediatric Cardiology, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China,Children’s Heart Center, Institute of Cardiovascular Development and Translational Medicine, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, China
| | - Yizhuo Wu
- Department of Pediatric Cardiology, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China,Institute for Developmental and Regenerative Cardiovascular Medicine, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Bingqian Yan
- Children’s Hospital of Fudan University, National Children’s Medical Center, Shanghai, China
| | - Weibin Zhang
- Department of Dermatology, People’s Hospital of Zhengzhou, Zhengzhou, China
| | - Xuedong Lin
- Department of Gastroenterology, Wenzhou Hospital of Chinese Medicine, Wenzhou, China
| | - Lvyan Jiang
- Ping’an Community Healthcare Center Hospital, Shanghai, China
| | - Pengjun Zhao
- Department of Pediatric Cardiology, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China,*Correspondence: Pengjun Zhao, ; Kun Sun,
| | - Kun Sun
- Department of Pediatric Cardiology, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China,*Correspondence: Pengjun Zhao, ; Kun Sun,
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3
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Cirilli I, Damiani E, Dludla PV, Hargreaves I, Marcheggiani F, Millichap LE, Orlando P, Silvestri S, Tiano L. Role of Coenzyme Q 10 in Health and Disease: An Update on the Last 10 Years (2010-2020). Antioxidants (Basel) 2021; 10:antiox10081325. [PMID: 34439573 PMCID: PMC8389239 DOI: 10.3390/antiox10081325] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 08/17/2021] [Accepted: 08/20/2021] [Indexed: 12/11/2022] Open
Abstract
The present review focuses on preclinical and clinical studies conducted in the last decade that contribute to increasing knowledge on Coenzyme Q10's role in health and disease. Classical antioxidant and bioenergetic functions of the coenzyme have been taken into consideration, as well as novel mechanisms of action involving the redox-regulated activation of molecular pathways associated with anti-inflammatory activities. Cardiovascular research and fertility remain major fields of application of Coenzyme Q10, although novel applications, in particular in relation to topical application, are gaining considerable interest. In this respect, bioavailability represents a major challenge and the innovation in formulation aspects is gaining critical importance.
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Affiliation(s)
- Ilenia Cirilli
- School of Pharmacy, University of Camerino, 62032 Camerino, Italy;
| | - Elisabetta Damiani
- Department of Life and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy; (E.D.); (F.M.); (L.E.M.); (P.O.); (S.S.)
| | - Phiwayinkosi Vusi Dludla
- Biomedical Research and Innovation Platform, South African Medical Research Council, Tygerberg 7505, South Africa;
| | - Iain Hargreaves
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool L3 3AF, UK;
| | - Fabio Marcheggiani
- Department of Life and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy; (E.D.); (F.M.); (L.E.M.); (P.O.); (S.S.)
| | - Lauren Elizabeth Millichap
- Department of Life and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy; (E.D.); (F.M.); (L.E.M.); (P.O.); (S.S.)
| | - Patrick Orlando
- Department of Life and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy; (E.D.); (F.M.); (L.E.M.); (P.O.); (S.S.)
| | - Sonia Silvestri
- Department of Life and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy; (E.D.); (F.M.); (L.E.M.); (P.O.); (S.S.)
| | - Luca Tiano
- Department of Life and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy; (E.D.); (F.M.); (L.E.M.); (P.O.); (S.S.)
- Correspondence: ; Tel.: +39-071-220-4394
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4
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Harisseh R, Abrial M, Chiari P, Al-Mawla R, Villedieu C, Tessier N, Bidaux G, Ovize M, Gharib A. A modified calcium retention capacity assay clarifies the roles of extra- and intracellular calcium pools in mitochondrial permeability transition pore opening. J Biol Chem 2019; 294:15282-15292. [PMID: 31434742 DOI: 10.1074/jbc.ra119.009477] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 08/20/2019] [Indexed: 11/06/2022] Open
Abstract
Calcium homeostasis is essential for cell survival and is precisely controlled by several cellular actors such as the sarco/endoplasmic reticulum and mitochondria. Upon stress induction, Ca2+ released from sarco/endoplasmic reticulum stores and from extracellular Ca2+ pools accumulates in the cytosol and in the mitochondria. This induces Ca2+ overload and ultimately the opening of the mitochondrial permeability transition pore (mPTP), promoting cell death. Currently, it is unclear whether intracellular Ca2+ stores are sufficient to promote the mPTP opening. Ca2+ retention capacity (CRC) corresponds to the maximal Ca2+ uptake by the mitochondria before mPTP opening. In this study, using permeabilized cardiomyocytes isolated from adult mice, we modified the standard CRC assay by specifically inducing reticular Ca2+ release to investigate the respective contributions of reticular Ca2+ and extracellular Ca2+ to mPTP opening in normoxic conditions or after anoxia-reoxygenation. Our experiments revealed that Ca2+ released from the sarco/endoplasmic reticulum is not sufficient to trigger mPTP opening and corresponds to ∼50% of the total Ca2+ levels required to open the mPTP. We also studied mPTP opening after anoxia-reoxygenation in the presence or absence of extracellular Ca2+ In both conditions, Ca2+ leakage from internal stores could not trigger mPTP opening by itself but significantly decreased the CRC. Our findings highlight how a modified CRC assay enables the investigation of the role of reticular and extracellular Ca2+ pools in the regulation of the mPTP. We propose that this method may be useful for screening molecules of interest implicated in mPTP regulation.
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Affiliation(s)
- Rania Harisseh
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Maryline Abrial
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Pascal Chiari
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France .,Service d'Anesthésie Réanimation, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Ribal Al-Mawla
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Camille Villedieu
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Nolwenn Tessier
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Gabriel Bidaux
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Michel Ovize
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France.,Service d'Explorations Fonctionnelles Cardiovasculaires and Centre d'Investigation Clinique de Lyon, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Abdallah Gharib
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
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5
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Chen Q, Thompson J, Hu Y, Dean J, Lesnefsky EJ. Inhibition of the ubiquitous calpains protects complex I activity and enables improved mitophagy in the heart following ischemia-reperfusion. Am J Physiol Cell Physiol 2019; 317:C910-C921. [PMID: 31411917 DOI: 10.1152/ajpcell.00190.2019] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Activation of calpain 1 (CPN1) and calpain 2 (CPN2) contributes to cardiac injury during ischemia (ISC) and reperfusion (REP). Complex I activity is decreased in heart mitochondria following ISC-REP. CPN1 and CPN2 are ubiquitous calpains that exist in both cytosol (cs)-CPN1 and 2 and mitochondria (mit)-CPN1 and 2. Recent work shows that the complex I subunit (NDUFS7) is a potential substrate of the mit-CPN1. We asked whether ISC-REP led to decreased complex I activity via proteolysis of the NDUFS7 subunit via activation of mit-CPN1 and -2. Activation of cs-CPN1 and -2 decreases mitophagy in hepatocytes following ISC-REP. We asked whether activation of cs-CPN1 and -2 impaired mitophagy in the heart following ISC-REP. Buffer-perfused rat hearts underwent 25 min of global ISC and 30 min of REP. MDL-28170 (MDL; 10 µM) was used to inhibit CPN1 and -2. Cytosol, subsarcolemmal mitochondria (SSM), and interfibrillar mitochondria (IFM) were isolated at the end of heart perfusion. Cardiac ISC-REP led to decreased complex I activity with a decrease in the content of NDUFS7 in both SSM and IFM. ISC-REP also resulted in a decrease in cytosolic beclin-1 content, a key component of the autophagy pathway required to form autophagosomes. MDL treatment protected the contents of cytosolic beclin-1 and mitochondrial NDUFS7 in hearts following ISC-REP. These results support that activation of both cytosolic and mitochondrial calpains impairs mitochondria during cardiac ISC-REP. Mitochondria-localized calpains impair complex I via cleavage of a key subunit. Activation of cytosolic calpains contributes to mitochondrial dysfunction by impairing removal of the impaired mitochondria through depletion of a key component of the mitophagy process.
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Affiliation(s)
- Qun Chen
- Department of Medicine, Division of Cardiology, Virginia Commonwealth University, Richmond, Virginia
| | - Jeremy Thompson
- Department of Medicine, Division of Cardiology, Virginia Commonwealth University, Richmond, Virginia
| | - Ying Hu
- Department of Medicine, Division of Cardiology, Virginia Commonwealth University, Richmond, Virginia
| | - Joseph Dean
- Department of Medicine, Division of Cardiology, Virginia Commonwealth University, Richmond, Virginia
| | - Edward J Lesnefsky
- Department of Medicine, Division of Cardiology, Virginia Commonwealth University, Richmond, Virginia.,Department of Biochemistry and Molecular Biology Virginia Commonwealth University, Richmond, Virginia.,Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, Virginia.,McGuire Department of Veterans Affairs Medical Center, Richmond, Virginia
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6
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Harhous Z, Badawi S, Bona NG, Pillot B, Augeul L, Paillard M, Booz GW, Canet-Soulas E, Ovize M, Kurdi M, Bidaux G. Critical appraisal of STAT3 pattern in adult cardiomyocytes. J Mol Cell Cardiol 2019; 131:91-100. [PMID: 31022374 DOI: 10.1016/j.yjmcc.2019.04.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 04/08/2019] [Accepted: 04/19/2019] [Indexed: 11/19/2022]
Abstract
The signal transducer and activator of transcription 3, STAT3, transfers cellular signals from the plasma membrane to the nucleus, acting as a signaling molecule and a transcription factor. Reports proposed an additional non-canonical role of STAT3 that could regulate the activity of complexes I and II of the electron transport chain and the opening of the mitochondrial permeability transition pore (PTP) after ischemia-reperfusion in various cell types. The native expression of STAT3 in heart mitochondria, together with a direct versus an indirect transcriptional role in mitochondrial functions, have been recently questioned. The objective of the present study was to investigate the cellular distribution of STAT3 in mouse adult cardiomyocytes under basal and stress conditions, along with assessing its presence and activity in cardiac mitochondria using structural and functional approaches. The analysis of the spatial distribution of STAT3 signal in the cardiomyocytes interestingly showed that it is transversely distributed along the T-tubules and in the nucleus. This distribution was neither affected by hypoxia nor by hypoxia/re‑oxygenation conditions. Focusing on the mitochondrial STAT3 localization, our results suggest that serine-phosphorylated STAT3 (PS727-STAT3) and total STAT3 are detected in crude but not in pure mitochondria of mouse adult cardiomyocytes, under basal and ischemia-reperfusion conditions. The inhibition of STAT3, with a pre-validated non-toxic Stattic dose, had no significant effects on mitochondrial respiration, but a weak effect on the calcium retention capacity. Overall, our results exclusively reveal a unique cellular distribution of STAT3 in mouse adult cardiomyocytes, along the T-tubules and in nucleus, under different conditions. They also challenge the expression and activity of STAT3 in mitochondria of these cells under basal conditions and following ischemia-reperfusion. In addition, our results underline technical methods, complemental to cell fractionation, to evaluate STAT3 roles during hypoxia-reoxygenation and at the interface between nucleus and endoplasmic reticulum.
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Affiliation(s)
- Zeina Harhous
- Univ-Lyon, CarMeN Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, INSA Lyon, Oullins, France; IHU OPeRa, Groupement Hospitalier EST, Bâtiment B13, 59 boulevard Pinel, F-69500 Bron, France; Lebanese University, Faculty of Sciences, Doctoral School of Sciences and Techlogy, Laboratory of Experimental and Clinical Pharmacology, Hadat, Lebanon
| | - Sally Badawi
- Univ-Lyon, CarMeN Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, INSA Lyon, Oullins, France; IHU OPeRa, Groupement Hospitalier EST, Bâtiment B13, 59 boulevard Pinel, F-69500 Bron, France; Lebanese University, Faculty of Sciences, Doctoral School of Sciences and Techlogy, Laboratory of Experimental and Clinical Pharmacology, Hadat, Lebanon
| | - Noelle Gallo Bona
- Univ-Lyon, CarMeN Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, INSA Lyon, Oullins, France; IHU OPeRa, Groupement Hospitalier EST, Bâtiment B13, 59 boulevard Pinel, F-69500 Bron, France
| | - Bruno Pillot
- Univ-Lyon, CarMeN Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, INSA Lyon, Oullins, France; IHU OPeRa, Groupement Hospitalier EST, Bâtiment B13, 59 boulevard Pinel, F-69500 Bron, France
| | - Lionel Augeul
- Univ-Lyon, CarMeN Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, INSA Lyon, Oullins, France; IHU OPeRa, Groupement Hospitalier EST, Bâtiment B13, 59 boulevard Pinel, F-69500 Bron, France
| | - Melanie Paillard
- Univ-Lyon, CarMeN Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, INSA Lyon, Oullins, France; IHU OPeRa, Groupement Hospitalier EST, Bâtiment B13, 59 boulevard Pinel, F-69500 Bron, France
| | - George W Booz
- Department of Pharmacology and Toxicology, School of Medicine, The University of Mississippi Medical Center, Jackson, MS, USA
| | - Emmanuelle Canet-Soulas
- Univ-Lyon, CarMeN Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, INSA Lyon, Oullins, France; IHU OPeRa, Groupement Hospitalier EST, Bâtiment B13, 59 boulevard Pinel, F-69500 Bron, France
| | - Michel Ovize
- Univ-Lyon, CarMeN Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, INSA Lyon, Oullins, France; IHU OPeRa, Groupement Hospitalier EST, Bâtiment B13, 59 boulevard Pinel, F-69500 Bron, France
| | - Mazen Kurdi
- Lebanese University, Faculty of Sciences, Doctoral School of Sciences and Techlogy, Laboratory of Experimental and Clinical Pharmacology, Hadat, Lebanon.
| | - Gabriel Bidaux
- Univ-Lyon, CarMeN Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, INSA Lyon, Oullins, France; IHU OPeRa, Groupement Hospitalier EST, Bâtiment B13, 59 boulevard Pinel, F-69500 Bron, France.
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7
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Harisseh R, Chiari P, Villedieu C, Sueur P, Abrial M, Fellahi JL, Ovize M, Gharib A. Cyclophilin D Modulates the Cardiac Mitochondrial Target of Isoflurane, Sevoflurane, and Desflurane. J Cardiovasc Pharmacol 2017; 69:326-334. [PMID: 28328748 DOI: 10.1097/fjc.0000000000000479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND Volatile anesthetics are known to limit myocardial ischemia-reperfusion injuries. Mitochondria were shown to be major contributors to cardioprotection. Cyclophilin D (CypD) is one of the main regulators of mitochondria-induced cell death. We compared the effect of isoflurane, sevoflurane, and desflurane in the presence or absence of CypD, to clarify its role in the mechanism of cardioprotection induced by these anesthetics. METHODS Oxidative phosphorylation, mitochondrial membrane potential, and H2O2 production were measured in isolated mitochondria from wild-type (WT) or CypD knockout mice in basal conditions and after hypoxia-reoxygenation in the presence or absence of volatile anesthetics. RESULTS All volatile anesthetics inhibited mitochondrial state 3 of complex I, decreased membrane potential, and increased adenosine diphosphate consumption duration in both WT and CypD knockout mice. However, they differently modified H2O2 production after stimulation by succinate: CypD ablation reduced H2O2 production, isoflurane decreased H2O2 level in WT but not in CypD knockout mice, sevoflurane affected both lines whereas desflurane increased H2O2 production in CypD knockout and had no effect on WT mice. CONCLUSIONS This study showed different effects of isoflurane, sevoflurane, and desflurane on mitochondrial functions and highlighted the implication of CypD in the regulation of adenosine diphosphate consumption and complex I-induced radical oxygen species production.
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MESH Headings
- Adenosine Triphosphate/metabolism
- Anesthetics, Inhalation/pharmacology
- Animals
- Peptidyl-Prolyl Isomerase F
- Cyclophilins/deficiency
- Cyclophilins/genetics
- Cyclophilins/metabolism
- Cytoprotection
- Desflurane
- Energy Metabolism/drug effects
- Genotype
- Hydrogen Peroxide/metabolism
- Isoflurane/analogs & derivatives
- Isoflurane/pharmacology
- Male
- Membrane Potential, Mitochondrial/drug effects
- Methyl Ethers/pharmacology
- Mice, 129 Strain
- Mice, Inbred C57BL
- Mice, Knockout
- Mitochondria, Heart/drug effects
- Mitochondria, Heart/enzymology
- Mitochondria, Heart/pathology
- Myocardial Reperfusion Injury/enzymology
- Myocardial Reperfusion Injury/pathology
- Myocardial Reperfusion Injury/prevention & control
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/enzymology
- Myocytes, Cardiac/pathology
- Oxidative Phosphorylation/drug effects
- Phenotype
- Protective Agents/pharmacology
- Sevoflurane
- Time Factors
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Affiliation(s)
- Rania Harisseh
- *INSERM UMR 1060, CarMeN Laboratory, Univ Lyon1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, Lyon, France; †Service d'Anesthésie Réanimation, Hôpital Louis Pradel, Hospices Civils de Lyon, Lyon, France; and ‡Service d'Explorations Fonctionnelles Cardiovasculaires & CIC de Lyon, Hôpital Louis Pradel, Hospices Civils de Lyon, Lyon, France
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8
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Lesnefsky EJ, Chen Q, Hoppel CL. Mitochondrial Metabolism in Aging Heart. Circ Res 2017; 118:1593-611. [PMID: 27174952 DOI: 10.1161/circresaha.116.307505] [Citation(s) in RCA: 216] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 04/05/2016] [Indexed: 02/07/2023]
Abstract
Altered mitochondrial metabolism is the underlying basis for the increased sensitivity in the aged heart to stress. The aged heart exhibits impaired metabolic flexibility, with a decreased capacity to oxidize fatty acids and enhanced dependence on glucose metabolism. Aging impairs mitochondrial oxidative phosphorylation, with a greater role played by the mitochondria located between the myofibrils, the interfibrillar mitochondria. With aging, there is a decrease in activity of complexes III and IV, which account for the decrease in respiration. Furthermore, aging decreases mitochondrial content among the myofibrils. The end result is that in the interfibrillar area, there is ≈50% decrease in mitochondrial function, affecting all substrates. The defective mitochondria persist in the aged heart, leading to enhanced oxidant production and oxidative injury and the activation of oxidant signaling for cell death. Aging defects in mitochondria represent new therapeutic targets, whether by manipulation of the mitochondrial proteome, modulation of electron transport, activation of biogenesis or mitophagy, or the regulation of mitochondrial fission and fusion. These mechanisms provide new ways to attenuate cardiac disease in elders by preemptive treatment of age-related defects, in contrast to the treatment of disease-induced dysfunction.
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Affiliation(s)
- Edward J Lesnefsky
- From the Division of Cardiology, Department of Medicine, Pauley Heart Center (E.J.L, Q.C.), Departments of Biochemistry and Molecular Biology and Physiology and Biophsyics (E.J.L.), Virginia Commonwealth University, Richmond, VA (E.J.L., Q.C.); Medical Service, McGuire Veterans Affairs Medical Center, Richmond, VA (E.J.L.); and Departments of Pharmacology (C.L.H.) and Medicine (E.J.L., C.L.H.), Center for Mitochondrial Disease (C.L.H.), Case Western Reserve University, School of Medicine, Cleveland, OH
| | - Qun Chen
- From the Division of Cardiology, Department of Medicine, Pauley Heart Center (E.J.L, Q.C.), Departments of Biochemistry and Molecular Biology and Physiology and Biophsyics (E.J.L.), Virginia Commonwealth University, Richmond, VA (E.J.L., Q.C.); Medical Service, McGuire Veterans Affairs Medical Center, Richmond, VA (E.J.L.); and Departments of Pharmacology (C.L.H.) and Medicine (E.J.L., C.L.H.), Center for Mitochondrial Disease (C.L.H.), Case Western Reserve University, School of Medicine, Cleveland, OH
| | - Charles L Hoppel
- From the Division of Cardiology, Department of Medicine, Pauley Heart Center (E.J.L, Q.C.), Departments of Biochemistry and Molecular Biology and Physiology and Biophsyics (E.J.L.), Virginia Commonwealth University, Richmond, VA (E.J.L., Q.C.); Medical Service, McGuire Veterans Affairs Medical Center, Richmond, VA (E.J.L.); and Departments of Pharmacology (C.L.H.) and Medicine (E.J.L., C.L.H.), Center for Mitochondrial Disease (C.L.H.), Case Western Reserve University, School of Medicine, Cleveland, OH.
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9
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Unacylated ghrelin analog prevents myocardial reperfusion injury independently of permeability transition pore. Basic Res Cardiol 2016; 112:4. [PMID: 27995363 DOI: 10.1007/s00395-016-0595-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 12/09/2016] [Indexed: 02/06/2023]
Abstract
Reperfusion injury is responsible for an important part of myocardial infarct establishment due notably to triggering cardiomyocytes death at the first minutes of reperfusion. AZP-531 is an optimized analog of unacylated ghrelin currently in clinical development in several metabolic diseases. We investigated a potential cardioprotective effect of AZP-531 in ischemia/reperfusion (IR) and the molecular underlying mechanism(s) involved in this protection. In vivo postconditioning with AZP-531 in C57BL6 mouse IR model decreased infarct size. Western blot analysis on areas at risk from the different mouse groups showed that AZP-531 activates Akt, ERK1-2 as well as S6 and 4EBP1, mTORC1 effectors. We also showed an inhibition of caspase 3 cleavage and Bax translocation to the mitochondria. AZP-531 also stimulated the expression of antioxidants and was capable of decreasing mitochondrial H2O2 production, contributing to the reduction of ROS accumulation. AZP-531 exhibits cardioprotective effect when administrated for postconditioning in C57BL6 mouse IR model. Treatment with AZP-531 rescued the myocardium from cell death at early reperfusion by stimulating protein synthesis, inhibiting Bax/caspase 3-induced apoptosis as well as ROS accumulation and oxidative stress-induced necrosis. AZP-531 may prove useful in the treatment of IR injury.
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10
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Le Page S, Niro M, Fauconnier J, Cellier L, Tamareille S, Gharib A, Chevrollier A, Loufrani L, Grenier C, Kamel R, Sarzi E, Lacampagne A, Ovize M, Henrion D, Reynier P, Lenaers G, Mirebeau-Prunier D, Prunier F. Increase in Cardiac Ischemia-Reperfusion Injuries in Opa1+/- Mouse Model. PLoS One 2016; 11:e0164066. [PMID: 27723783 PMCID: PMC5056696 DOI: 10.1371/journal.pone.0164066] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 09/19/2016] [Indexed: 11/21/2022] Open
Abstract
Background Recent data suggests the involvement of mitochondrial dynamics in cardiac ischemia/reperfusion (I/R) injuries. Whilst excessive mitochondrial fission has been described as detrimental, the role of fusion proteins in this context remains uncertain. Objectives To investigate whether Opa1 (protein involved in mitochondrial inner-membrane fusion) deficiency affects I/R injuries. Methods and Results We examined mice exhibiting Opa1delTTAG mutations (Opa1+/-), showing 70% Opa1 protein expression in the myocardium as compared to their wild-type (WT) littermates. Cardiac left-ventricular systolic function assessed by means of echocardiography was observed to be similar in 3-month-old WT and Opa1+/- mice. After subjection to I/R, infarct size was significantly greater in Opa1+/- than in WTs both in vivo (43.2±4.1% vs. 28.4±3.5%, respectively; p<0.01) and ex vivo (71.1±3.2% vs. 59.6±8.5%, respectively; p<0.05). No difference was observed in the expression of other main fission/fusion protein, oxidative phosphorylation, apoptotic markers, or mitochondrial permeability transition pore (mPTP) function. Analysis of calcium transients in isolated ventricular cardiomyocytes demonstrated a lower sarcoplasmic reticulum Ca2+ uptake, whereas cytosolic Ca2+ removal from the Na+/Ca2+ exchanger (NCX) was increased, whilst SERCA2a, phospholamban, and NCX protein expression levels were unaffected in Opa1+/- compared to WT mice. Simultaneous whole-cell patch-clamp recordings of mitochondrial Ca2+ movements and ventricular action potential (AP) showed impairment of dynamic mitochondrial Ca2+ uptake and a marked increase in the AP late repolarization phase in conjunction with greater occurrence of arrhythmia in Opa1+/- mice. Conclusion Opa1 deficiency was associated with increased sensitivity to I/R, imbalance in dynamic mitochondrial Ca2+ uptake, and subsequent increase in NCX activity.
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Affiliation(s)
- Sophie Le Page
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- Laboratoire Cardioprotection Remodelage et Thrombose, Angers, France
- Service de Cardiologie, CHU Angers, Angers, France
| | - Marjorie Niro
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- Laboratoire Cardioprotection Remodelage et Thrombose, Angers, France
- Service de Cardiologie, CHU Angers, Angers, France
| | | | - Laura Cellier
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- Laboratoire Cardioprotection Remodelage et Thrombose, Angers, France
| | - Sophie Tamareille
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- Laboratoire Cardioprotection Remodelage et Thrombose, Angers, France
| | | | - Arnaud Chevrollier
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- INSERM UMR_S1083, CNRS UMR_C6214, BNMI, Angers, France
| | - Laurent Loufrani
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- INSERM UMR_S1083, CNRS UMR_C6214, BNMI, Angers, France
| | - Céline Grenier
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- INSERM UMR_S1083, CNRS UMR_C6214, BNMI, Angers, France
| | - Rima Kamel
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- Laboratoire Cardioprotection Remodelage et Thrombose, Angers, France
| | - Emmanuelle Sarzi
- Institut des Neurosciences de Montpellier, INSERM U1051, Université Montpellier I et II, Montpellier, France
| | - Alain Lacampagne
- INSERM U1046, Université Montpellier I et II, Montpellier, France
| | | | - Daniel Henrion
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- INSERM UMR_S1083, CNRS UMR_C6214, BNMI, Angers, France
| | - Pascal Reynier
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- INSERM UMR_S1083, CNRS UMR_C6214, BNMI, Angers, France
| | - Guy Lenaers
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- INSERM UMR_S1083, CNRS UMR_C6214, BNMI, Angers, France
| | - Delphine Mirebeau-Prunier
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- INSERM UMR_S1083, CNRS UMR_C6214, BNMI, Angers, France
| | - Fabrice Prunier
- Institut MITOVASC, Université Angers, CHU Angers, Angers, France
- Laboratoire Cardioprotection Remodelage et Thrombose, Angers, France
- Service de Cardiologie, CHU Angers, Angers, France
- * E-mail:
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11
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Lougiakis N, Papapetropoulos A, Gikas E, Toumpas S, Efentakis P, Wedmann R, Zoga A, Zhou Z, Iliodromitis EK, Skaltsounis AL, Filipovic MR, Pouli N, Marakos P, Andreadou I. Synthesis and Pharmacological Evaluation of Novel Adenine–Hydrogen Sulfide Slow Release Hybrids Designed as Multitarget Cardioprotective Agents. J Med Chem 2016; 59:1776-90. [DOI: 10.1021/acs.jmedchem.5b01223] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Nikolaos Lougiakis
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
| | - Andreas Papapetropoulos
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
| | - Evangelos Gikas
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
| | - Spyridon Toumpas
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
| | - Panagiotis Efentakis
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
| | - Rudolf Wedmann
- Department
of Chemistry and Pharmacy, Friedrich-Alexander University of Erlangen-Nuremberg, 91054 Erlangen, Germany
| | - Anastasia Zoga
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
- Second University
Department of Cardiology, Medical School, Attikon General Hospital,
National and Kapodistrian University of Athens, 12462, Athens, Greece
| | - Zhongmin Zhou
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
| | - Efstathios K. Iliodromitis
- Second University
Department of Cardiology, Medical School, Attikon General Hospital,
National and Kapodistrian University of Athens, 12462, Athens, Greece
| | - Alexios-Leandros Skaltsounis
- Department
of Pharmacognosy and Natural Products Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
| | - Milos R. Filipovic
- Department
of Chemistry and Pharmacy, Friedrich-Alexander University of Erlangen-Nuremberg, 91054 Erlangen, Germany
| | - Nicole Pouli
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
| | - Panagiotis Marakos
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
| | - Ioanna Andreadou
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, 15771, Athens, Greece
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12
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Thompson J, Hu Y, Lesnefsky EJ, Chen Q. Activation of mitochondrial calpain and increased cardiac injury: beyond AIF release. Am J Physiol Heart Circ Physiol 2016; 310:H376-84. [PMID: 26637561 PMCID: PMC4796621 DOI: 10.1152/ajpheart.00748.2015] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Accepted: 11/23/2015] [Indexed: 12/14/2022]
Abstract
Calpain 1 (CPN1) is a ubiquitous cysteine protease that exists in both cytosol and cardiac mitochondria. Mitochondrial CPN1 (mit-CPN1) is located in the intermembrane space and matrix. Activation of mit-CPN1 within the intermembrane space increases cardiac injury by releasing apoptosis-inducing factor from mitochondria during ischemia-reperfusion (IR). We asked if activation of mit-CPN1 is involved in mitochondrial injury during IR. MDL-28170 (MDL) was used to inhibit CPN1 in buffer-perfused hearts following 25-min ischemia and 30-min reperfusion. MDL treatment decreased the release of lactate dehydrogenase into coronary effluent compared with untreated hearts, indicating that inhibition of CPN1 decreases cardiac injury. MDL also prevented the cleavage of spectrin (a substrate of CPN1) in cytosol during IR, supporting that MDL treatment decreased cytosolic calpain activation. In addition, MDL markedly improved calcium retention capacity compared with untreated heart, suggesting that MDL treatment decreases mitochondrial permeability transition pore opening. In addition, we found that IR led to decreased complex I activity, whereas inhibition of mit-CPN1 using MDL protected complex I. Pyruvate dehydrogenase content was decreased following IR. However, pyruvate dehydrogenase content was preserved in MDL-treated mitochondria. Taken together, MDL treatment decreased cardiac injury during IR by inhibiting both cytosolic and mit-CPN1. Activation of mit-CPN1 increases cardiac injury during IR by sensitizing mitochondrial permeability transition pore opening and impairing mitochondrial metabolism through damage of complex I.
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Affiliation(s)
- Jeremy Thompson
- Division of Cardiology, Department of Medicine, Virginia Commonwealth University, Richmond, Virginia
| | - Ying Hu
- Division of Cardiology, Department of Medicine, Virginia Commonwealth University, Richmond, Virginia
| | - Edward J Lesnefsky
- Division of Cardiology, Department of Medicine, Virginia Commonwealth University, Richmond, Virginia; Department of Biochemistry and Molecular Biology, Virginia Commonwealth University, Richmond, Virginia; Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, Virginia; and McGuire Veterans Affairs Medical Center, Richmond, Virginia
| | - Qun Chen
- Division of Cardiology, Department of Medicine, Virginia Commonwealth University, Richmond, Virginia;
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13
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Abstract
The field of mitochondrial ion channels has recently seen substantial progress, including the molecular identification of some of the channels. An integrative approach using genetics, electrophysiology, pharmacology, and cell biology to clarify the roles of these channels has thus become possible. It is by now clear that many of these channels are important for energy supply by the mitochondria and have a major impact on the fate of the entire cell as well. The purpose of this review is to provide an up-to-date overview of the electrophysiological properties, molecular identity, and pathophysiological functions of the mitochondrial ion channels studied so far and to highlight possible therapeutic perspectives based on current information.
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14
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Duicu OM, Mirica SN, Gheorgheosu DE, Privistirescu AI, Fira-Mladinescu O, Muntean DM. Ageing-induced decrease in cardiac mitochondrial function in healthy rats. Can J Physiol Pharmacol 2013; 91:593-600. [PMID: 23889593 DOI: 10.1139/cjpp-2012-0422] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
It is widely recognized that mitochondrial dysfunction is a key component of the multifactorial process of ageing. The effects of age on individual components of mitochondrial function vary across species and strains. In this study we investigated the oxygen consumption, the mitochondrial membrane potential (Δψ), the sensitivity of mitochondrial permeability transition pore (mPTP) to calcium overload, and the production of reactive oxygen species (ROS) in heart mitochondria isolated from old compared with adult healthy Sprague-Dawley rats. Respirometry studies and Δψ measurements were performed with an Oxygraph-2k equipped with a tetraphenylphosphonium electrode. ROS production and calcium retention capacity were measured spectrofluorimetrically. Our results show an important decline for all bioenergetic parameters for both complex I and complex II supported-respiration, a decreased Δψ in mitochondria energized with complex I substrates, and an increased mitochondrial ROS production in the old compared with the adult group. Mitochondrial sensitivity to Ca²⁺-induced mPTP opening was also increased in the old compared with the adult animals. Moreover, the protective effect of cyclosporine A on mPTP opening was significantly reduced in the old group. We conclude that healthy ageing is associated with a decrease in heart mitochondria function in Sprague-Dawley rats.
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Affiliation(s)
- Oana M Duicu
- Department of Pathophysiology, Victor Babeş University of Medicine and Pharmacy Timisoara, 14 Tudor Vladimirescu Street, 300173 Timişoara, Timiş, Romania
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