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Kuroshima T, Kawaguchi S, Okada M. Current Perspectives of Mitochondria in Sepsis-Induced Cardiomyopathy. Int J Mol Sci 2024; 25:4710. [PMID: 38731929 PMCID: PMC11083471 DOI: 10.3390/ijms25094710] [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: 03/24/2024] [Revised: 04/19/2024] [Accepted: 04/24/2024] [Indexed: 05/13/2024] Open
Abstract
Sepsis-induced cardiomyopathy (SICM) is one of the leading indicators for poor prognosis associated with sepsis. Despite its reversibility, prognosis varies widely among patients. Mitochondria play a key role in cellular energy production by generating adenosine triphosphate (ATP), which is vital for myocardial energy metabolism. Over recent years, mounting evidence suggests that severe sepsis not only triggers mitochondrial structural abnormalities such as apoptosis, incomplete autophagy, and mitophagy in cardiomyocytes but also compromises their function, leading to ATP depletion. This metabolic disruption is recognized as a significant contributor to SICM, yet effective treatment options remain elusive. Sepsis cannot be effectively treated with inotropic drugs in failing myocardium due to excessive inflammatory factors that blunt β-adrenergic receptors. This review will share the recent knowledge on myocardial cell death in sepsis and its molecular mechanisms, focusing on the role of mitochondria as an important metabolic regulator of SICM, and discuss the potential for developing therapies for sepsis-induced myocardial injury.
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Affiliation(s)
| | | | - Motoi Okada
- Department of Emergency Medicine, Asahikawa Medical University, Asahikawa 078-8510, Japan; (T.K.); (S.K.)
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Li N, Zhu QX, Li GZ, Wang T, Zhou H. Empagliflozin ameliorates diabetic cardiomyopathy probably via activating AMPK/PGC-1α and inhibiting the RhoA/ROCK pathway. World J Diabetes 2023; 14:1862-1876. [PMID: 38222788 PMCID: PMC10784799 DOI: 10.4239/wjd.v14.i12.1862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 10/20/2023] [Accepted: 11/17/2023] [Indexed: 12/14/2023] Open
Abstract
BACKGROUND Diabetic cardiomyopathy (DCM) increases the risk of hospitalization for heart failure (HF) and mortality in patients with diabetes mellitus. However, no specific therapy to delay the progression of DCM has been identified. Mitochondrial dysfunction, oxidative stress, inflammation, and calcium handling imbalance play a crucial role in the pathological processes of DCM, ultimately leading to cardiomyocyte apoptosis and cardiac dysfunctions. Empagliflozin, a novel glucose-lowering agent, has been confirmed to reduce the risk of hospitalization for HF in diabetic patients. Nevertheless, the molecular mechanisms by which this agent provides cardioprotection remain unclear. AIM To investigate the effects of empagliflozin on high glucose (HG)-induced oxidative stress and cardiomyocyte apoptosis and the underlying molecular mechanism. METHODS Twelve-week-old db/db mice and primary cardiomyocytes from neonatal rats stimulated with HG (30 mmol/L) were separately employed as in vivo and in vitro models. Echocardiography was used to evaluate cardiac function. Flow cytometry and TdT-mediated dUTP-biotin nick end labeling staining were used to assess apoptosis in myocardial cells. Mitochondrial function was assessed by cellular ATP levels and changes in mitochondrial membrane potential. Furthermore, intracellular reactive oxygen species production and superoxide dismutase activity were analyzed. Real-time quantitative PCR was used to analyze Bax and Bcl-2 mRNA expression. Western blot analysis was used to measure the phosphorylation of AMP-activated protein kinase (AMPK) and myosin phosphatase target subunit 1 (MYPT1), as well as the peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) and active caspase-3 protein levels. RESULTS In the in vivo experiment, db/db mice developed DCM. However, the treatment of db/db mice with empagliflozin (10 mg/kg/d) for 8 wk substantially enhanced cardiac function and significantly reduced myocardial apoptosis, accompanied by an increase in the phosphorylation of AMPK and PGC-1α protein levels, as well as a decrease in the phosphorylation of MYPT1 in the heart. In the in vitro experiment, the findings indicate that treatment of cardiomyocytes with empagliflozin (10 μM) or fasudil (FA) (a ROCK inhibitor, 100 μM) or overexpression of PGC-1α significantly attenuated HG-induced mitochondrial injury, oxidative stress, and cardiomyocyte apoptosis. However, the above effects were partly reversed by the addition of compound C (CC). In cells exposed to HG, empagliflozin treatment increased the protein levels of p-AMPK and PGC-1α protein while decreasing phosphorylated MYPT1 levels, and these changes were mitigated by the addition of CC. Adding FA and overexpressing PGC-1α in cells exposed to HG substantially increased PGC-1α protein levels. In addition, no sodium-glucose cotransporter (SGLT)2 protein expression was detected in cardiomyocytes. CONCLUSION Empagliflozin partially achieves anti-oxidative stress and anti-apoptotic effects on cardiomyocytes under HG conditions by activating AMPK/PGC-1α and suppressing of the RhoA/ROCK pathway independent of SGLT2.
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Affiliation(s)
- Na Li
- Department of Endocrinology, The Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China
| | - Qiu-Xiao Zhu
- Department of Endocrinology, The Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China
| | - Gui-Zhi Li
- Department of Endocrinology, The Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China
| | - Ting Wang
- Department of Endocrinology, The Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China
| | - Hong Zhou
- Department of Endocrinology, The Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China
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Liu P, Xiao Z, Lu X, Zhang X, Huang J, Li C. Fasudil and SR1001 synergistically protect against sepsis-associated pancreatic injury by inhibiting RhoA/ROCK pathway and Th17/IL-17 response. Heliyon 2023; 9:e20118. [PMID: 37809525 PMCID: PMC10559842 DOI: 10.1016/j.heliyon.2023.e20118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 09/12/2023] [Accepted: 09/12/2023] [Indexed: 10/10/2023] Open
Abstract
Sepsis is defined as a dysregulated host response to infection that can result in organ dysfunction and high mortality, which needs more effective treatment urgently. Pancreas is one of the most vulnerable organs in sepsis, resulting in sepsis-associated pancreatic injury, which is a fatal complication of sepsis. The aim of this study was to investigate the effect of combination of fasudil and SR1001 on sepsis-associated pancreatic injury and to explore the underlying mechanisms. The model of sepsis-associated pancreatic injury was induced by cecal ligation and puncture. Pancreatic injury was evaluated by HE staining, histopathological scores and amylase activity. The frequency of Th17 cells was analyzed by flow cytometry. Serum IL-17 level was determined by ELISA. Protein levels of RORγt, p-STAT3, GEF-H1, RhoA and ROCK1 were determined by Western blot. The apoptosis of pancreatic cells was examined by TUNEL analysis and Hoechst33342/PI staining. Compared to the sham group, the model group showed significant pathological injury including edema, hyperemia, vacuolization and necrosis. After treatment with fasudil, model mice showed an obvious reduction of Th17 cells and IL-17. SR1001 significantly reduced the expressions of GEF-H1, RhoA and ROCK1 in the model mice. The combination treatment with fasudil and SR1001 significantly inhibited the differentiation of Th17 cells, expressions of IL-17, GEF-H1, RhoA and ROCK1, which were more effective than each mono-treatment. In addition, our data revealed a remarkable decrease of apoptosis in pancreatic acinar cells culturing with fasudil or SR1001, which was further inhibited by their combination culture. Lipopolysaccharide remarkably upregulated the differentiation of Th17 cells in vitro, which could be significantly downregulated by fasudil or SR1001, and further downregulated by their combination treatment. Taken together, the combination of fasudil with SR1001 has a synergistic effect on protecting against sepsis-associated pancreatic injury in C57BL/6 mice.
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Affiliation(s)
- Pingping Liu
- Department of Emergency, Key Laboratory of Pediatric Emergency Medicine of Hunan Province, Hunan Children's Hospital, Changsha, 410007, Hunan, PR China
| | - Zhenghui Xiao
- Department of Emergency, Key Laboratory of Pediatric Emergency Medicine of Hunan Province, Hunan Children's Hospital, Changsha, 410007, Hunan, PR China
| | - Xiulan Lu
- Department of Emergency, Key Laboratory of Pediatric Emergency Medicine of Hunan Province, Hunan Children's Hospital, Changsha, 410007, Hunan, PR China
| | - Xinping Zhang
- Department of Emergency, Key Laboratory of Pediatric Emergency Medicine of Hunan Province, Hunan Children's Hospital, Changsha, 410007, Hunan, PR China
| | - Jiaotian Huang
- Department of Emergency, Key Laboratory of Pediatric Emergency Medicine of Hunan Province, Hunan Children's Hospital, Changsha, 410007, Hunan, PR China
| | - Cheng Li
- Department of Respiratory and Critical Care Medicine, Hunan Provincial People's Hospital/The First Affiliated Hospital of Hunan Normal University, Changsha, 410005, Hunan, PR China
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Wang T, Li N, Yuan L, Zhao M, Li G, Chen Y, Zhou H. MALAT1/miR-185-5p mediated high glucose-induced oxidative stress, mitochondrial injury and cardiomyocyte apoptosis via the RhoA/ROCK pathway. J Cell Mol Med 2023; 27:2495-2506. [PMID: 37395157 PMCID: PMC10468660 DOI: 10.1111/jcmm.17835] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 06/20/2023] [Accepted: 06/24/2023] [Indexed: 07/04/2023] Open
Abstract
To explore the underlying mechanism of lncRNA MALAT1 in the pathogenesis of diabetic cardiomyopathy (DCM). DCM models were confirmed in db/db mice. MiRNAs in myocardium were detected by miRNA sequencing. The interactions of miR-185-5p with MALAT1 and RhoA were validated by dual-luciferase reporter assays. Primary neonatal cardiomyocytes were cultured with 5.5 or 30 mmol/L D-glucose (HG) in the presence or absence of MALAT1-shRNA and fasudil, a ROCK inhibitor. MALAT1 and miR-185-5p expression were determined by real-time quantitative PCR. The apoptotic cardiomyocytes were evaluated using flow cytometry and TUNEL staining. SOD activity and MDA contents were measured. The ROCK activity, phosphorylation of Drp1S616 , mitofusin 2 and apoptosis-related proteins were analysed by Western blotting. Mitochondrial membrane potential was examined by JC-1. MALAT1 was significantly up-regulated while miR-185-5p was down-regulated in myocardium of db/db mice and HG-induced cardiomyocytes. MALAT1 regulated RhoA/ROCK pathway via sponging miR-185-5p in cardiomyocytes in HG. Knockdown of MALAT1 and fasudil all inhibited HG-induced oxidative stress, and alleviated imbalance of mitochondrial dynamics and mitochondrial dysfunction, accompanied by reduced cardiomyocyte apoptosis. MALAT1 activated the RhoA/ROCK pathway via sponging miR-185-5p and mediated HG-induced oxidative stress, mitochondrial damage and apoptosis of cardiomyocytes in mice.
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Affiliation(s)
- Ting Wang
- Department of EndocrinologyThe Second Hospital of Hebei Medical UniversityShijiazhuangPeople's Republic of China
| | - Na Li
- Department of EndocrinologyThe Second Hospital of Hebei Medical UniversityShijiazhuangPeople's Republic of China
| | - Lingling Yuan
- Department of EndocrinologyThe Second Hospital of Hebei Medical UniversityShijiazhuangPeople's Republic of China
| | - Mengnan Zhao
- Department of EndocrinologyThe Second Hospital of Hebei Medical UniversityShijiazhuangPeople's Republic of China
| | - Guizhi Li
- Department of EndocrinologyThe Second Hospital of Hebei Medical UniversityShijiazhuangPeople's Republic of China
| | - Yanxia Chen
- Department of EndocrinologyThe Second Hospital of Hebei Medical UniversityShijiazhuangPeople's Republic of China
| | - Hong Zhou
- Department of EndocrinologyThe Second Hospital of Hebei Medical UniversityShijiazhuangPeople's Republic of China
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Wang Z, Qiang X, Peng Y, Fu W, Zhao Q, He D. Design and synthesis of salidroside analogs and their bioactivity against septic myocardial injury. Bioorg Chem 2023; 138:106609. [PMID: 37207595 DOI: 10.1016/j.bioorg.2023.106609] [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: 01/14/2023] [Revised: 05/04/2023] [Accepted: 05/10/2023] [Indexed: 05/21/2023]
Abstract
Cardiac tissue suffers much from sepsis, and the incidence of myocardial injury is high in septic patients. The treatment of sepsis myocardial injury (SMI) has been the focus of clinical medicine. Salidroside shows myocardial cell protection, anti-oxidation and anti- inflammation effects, and it is thought as one of the potential compounds to treat sepsis myocardial injury. However, its anti-inflammatory activity is lower and its pharmacokinetic properties are not ideal, which is far from clinical application. Here, a series of salidroside analogs were synthesized, and their bioactivities were evaluated from several aspects, including their anti-oxidant and anti-inflammatory activities in vitro and anti-sepsis myocardial injury activities in vivo. Of all the compounds which synthesized, compounds 2 and 3 exhibited stronger anti-inflammatory activities than the others; after treating LPS-stimulated RAW264.7 or H9c2 cells with each of them, the levels of IL-1β, IL-6 and TNF-α were down-regulated in a dose-dependent manner. In the anti-oxidative stress injury test, compounds 2 and 3 not only markedly increased the survival rate of cells, and but also improved the cellular oxidative stress-related indicators MDA, SOD and cell damage marker LDH in a dose-dependent manner. In the LPS-induced septic rat myocardial injury models (in vivo), the two compounds also showed good bioactivities. They also reduced the expression of IL-1β, IL-6 and TNF-α, and blocked cell damage by suppressing overhauled oxidation in septic rats. In addition, the myocardial injury was significantly improved and the inflammatory infiltration was reduced after treatment with the two compounds. In conclusion, the salidroside analogs (2 and 3) showed promising therapeutical effect on septic myocardial injury in LPS-model rats, and they could be good candidates for clinical trials against inflammation and septic myocardial injury.
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Affiliation(s)
- Zongyuan Wang
- Materia Medica Development Group, Institute of Medicinal Chemistry, School of Pharmacy of Lanzhou University, Lanzhou 730000, China
| | - Xin Qiang
- Materia Medica Development Group, Institute of Medicinal Chemistry, School of Pharmacy of Lanzhou University, Lanzhou 730000, China
| | - Yijie Peng
- Materia Medica Development Group, Institute of Medicinal Chemistry, School of Pharmacy of Lanzhou University, Lanzhou 730000, China
| | - Wenjie Fu
- Materia Medica Development Group, Institute of Medicinal Chemistry, School of Pharmacy of Lanzhou University, Lanzhou 730000, China
| | - Quanyi Zhao
- Materia Medica Development Group, Institute of Medicinal Chemistry, School of Pharmacy of Lanzhou University, Lanzhou 730000, China.
| | - Dian He
- Materia Medica Development Group, Institute of Medicinal Chemistry, School of Pharmacy of Lanzhou University, Lanzhou 730000, China
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Zhang Y, Li M, Wang Y, Han F, Shen K, Luo L, Li Y, Jia Y, Zhang J, Cai W, Wang K, Zhao M, Wang J, Gao X, Tian C, Guo B, Hu D. Exosome/metformin-loaded self-healing conductive hydrogel rescues microvascular dysfunction and promotes chronic diabetic wound healing by inhibiting mitochondrial fission. Bioact Mater 2023; 26:323-336. [PMID: 36950152 PMCID: PMC10027478 DOI: 10.1016/j.bioactmat.2023.01.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 01/08/2023] [Accepted: 01/27/2023] [Indexed: 03/17/2023] Open
Abstract
Chronic diabetic wounds remain a globally recognized clinical challenge. They occur due to high concentrations of reactive oxygen species and vascular function disorders. A promising strategy for diabetic wound healing is the delivery of exosomes, comprising bioactive dressings. Metformin activates the vascular endothelial growth factor pathway, thereby improving angiogenesis in hyperglycemic states. However, multifunctional hydrogels loaded with drugs and bioactive substances synergistically promote wound repair has been rarely reported, and the mechanism of their combinatorial effect of exosome and metformin in wound healing remains unclear. Here, we engineered dual-loaded hydrogels possessing tissue adhesive, antioxidant, self-healing and electrical conductivity properties, wherein 4-armed SH-PEG cross-links with Ag+, which minimizes damage to the loaded goods and investigated their mechanism of promotion effect for wound repair. Multiwalled carbon nanotubes exhibiting good conductivity were also incorporated into the hydrogels to generate hydrogen bonds with the thiol group, creating a stable three-dimensional structure for exosome and metformin loading. The diabetic wound model of the present study suggests that the PEG/Ag/CNT-M + E hydrogel promotes wound healing by triggering cell proliferation and angiogenesis and relieving peritraumatic inflammation and vascular injury. The mechanism of the dual-loaded hydrogel involves reducing the level of reactive oxygen species by interfering with mitochondrial fission, thereby protecting F-actin homeostasis and alleviating microvascular dysfunction. Hence, we propose a drug-bioactive substance combination therapy and provide a potential mechanism for developing vascular function-associated strategies for treating chronic diabetic wounds.
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Affiliation(s)
- Yue Zhang
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Meng Li
- State Key Laboratory for Mechanical Behavior of Materials, And Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, China
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Yunchuan Wang
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Fei Han
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Kuo Shen
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Liang Luo
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Yan Li
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Yanhui Jia
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Jian Zhang
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Weixia Cai
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Kejia Wang
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Ming Zhao
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Jing Wang
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Xiaowen Gao
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Chenyang Tian
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
| | - Baolin Guo
- State Key Laboratory for Mechanical Behavior of Materials, And Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, China
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710049, China
- Corresponding author. State Key Laboratory for Mechanical Behavior of Materials, and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, China.
| | - Dahai Hu
- Department of Burns and Cutaneous Surgery, Xijing Hospital, Fourth Military Medical University, 127 Changle West Road, Xi'an, Shaanxi, 710032, China
- Corresponding author.
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Qi Y, Chen Z, Guo B, Liu Z, Wang L, Liu S, Xue L, Ma M, Yin Y, Li Y, Liu G. Speckle-tracking echocardiography provides sensitive measurements of subtle early alterations associated with cardiac dysfunction in T2DM rats. BMC Cardiovasc Disord 2023; 23:266. [PMID: 37217862 DOI: 10.1186/s12872-023-03239-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 04/12/2023] [Indexed: 05/24/2023] Open
Abstract
BACKGROUND Diabetic cardiomyopathy results in cardiac structural and functional abnormalities. Previous studies have demonstrated that inhibiting the RhoA/ROCK signalling pathway increases the injury resistance of cardiomyocytes. The early detection of cardiac structural and functional alterations may facilitate an improved understanding of the pathophysiologic progress and guide therapy. This study aimed to identify the optimal diagnostic measures for the subtle early alterations of cardiac dysfunction in type 2 diabetes mellitus (T2DM) rats. METHODS Twenty-four rat models were divided into four groups and received treatments for 4 weeks: the CON group (control rats), the DM group (T2DM rats), the DMF group (T2DM rats receiving fasudil) and the CONF group (control rats receiving fasudil) group. Left ventricular (LV) structure was quantified by histological staining and transmission electron microscopy. LV function and myocardial deformation were assessed by high-frequency echocardiography. RESULTS Treatment with fasudil, a ROCK inhibitor, significantly protected against diabetes-induced myocardial hypertrophy, fibrosis and mitochondrial dysfunction. Impaired LV performance was found in T2DM rats, as evidenced by significant reductions in the ejection fraction (EF), fractional shortening (FS) and the mitral valve (MV) E/A ratio (which decreased 26%, 34% and 20%, respectively). Fasudil failed to improve the conventional ultrasonic parameters in T2DM rats, but the myocardial deformation measured by speckle-tracking echocardiography (STE) were significantly improved (global circumferential strain, GCS: P = 0.003; GCS rate, GCSR: P = 0.021). When receiver operating characteristic (ROC) curves were used in combination with linear regression analysis, STE parameters were found to be characterized by both optimal prediction of cardiac damage [AUC (95% CI): fractional area change, FAC: 0.927 (0.744, 0.993); GCS: 0.819 (0.610, 0.945); GCSR: 0.899 (0.707, 0.984)] and stronger correlations with cardiac fibrosis (FAC: r = -0.825; GCS: r = 0.772; GCSR: r = 0.829) than conventional parameters. CONCLUSION The results suggest that STE parameters are more sensitive and specific than conventional parameters in predicting the subtle cardiac functional changes that occur in the early stage, providing new insight into the management of diabetic cardiomyopathy.
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Affiliation(s)
- Yanchao Qi
- Department of Cardiology, The First Hospital of Hebei Medical University, Shijiazhuang, 050031, Hebei, People's Republic of China
- Heart Center, The First Hospital of Hebei Medical University, Shijiazhuang, 050031, Hebei, People's Republic of China
| | - Zhiyan Chen
- Heart Center, The First Hospital of Hebei Medical University, Shijiazhuang, 050031, Hebei, People's Republic of China
| | - Bingyan Guo
- Department of Cardiology, The Second Hospital of Hebei Medical University, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Zhe Liu
- Heart Center, The First Hospital of Hebei Medical University, Shijiazhuang, 050031, Hebei, People's Republic of China
| | - Lijie Wang
- Department of Cardiology, The Second Hospital of Hebei Medical University, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Suyun Liu
- Department of Cardiology, The Second Hospital of Hebei Medical University, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Lixiang Xue
- Center of Basic Medical Research, Peking University Third Hospital, Beijing, 100191, People's Republic of China
| | - Meifang Ma
- Department of Cardiology, Handan Central Hospital, Handan, 056008, Hebei, People's Republic of China
| | - Yajuan Yin
- Department of Cardiology, The First Hospital of Hebei Medical University, Shijiazhuang, 050031, Hebei, People's Republic of China
- Hebei International Joint Research Center for Structural Heart Disease, Shijiazhuang, 050031, Hebei, People's Republic of China
- Hebei Key Laboratory of Cardiac Injury Repair Mechanism Study, Shijiazhuang, 050031, Hebei, People's Republic of China
- Hebei Key Laboratory of Heart and Metabolism, Shijiazhuang, 050031, People's Republic of China
| | - Yongjun Li
- Department of Cardiology, The Second Hospital of Hebei Medical University, Shijiazhuang, 050000, Hebei, People's Republic of China.
| | - Gang Liu
- Department of Cardiology, The First Hospital of Hebei Medical University, Shijiazhuang, 050031, Hebei, People's Republic of China.
- Heart Center, The First Hospital of Hebei Medical University, Shijiazhuang, 050031, Hebei, People's Republic of China.
- Hebei International Joint Research Center for Structural Heart Disease, Shijiazhuang, 050031, Hebei, People's Republic of China.
- Hebei Key Laboratory of Cardiac Injury Repair Mechanism Study, Shijiazhuang, 050031, Hebei, People's Republic of China.
- Hebei Key Laboratory of Heart and Metabolism, Shijiazhuang, 050031, People's Republic of China.
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Wu Y, Zhu Y, Zhou Y, Liu L, Li T. Effects of Mdivi-1 on Extending the Golden Treatment Time following Hemorrhagic Shock in Hot Environment in Rats. Adv Biol (Weinh) 2023:e2300024. [PMID: 37104841 DOI: 10.1002/adbi.202300024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 03/07/2023] [Indexed: 04/29/2023]
Abstract
It is found that a hot environment aggravates hemorrhagic shock-induced internal environment and organ dysfunction. Meanwhile mitochondria show over-fission. Whether inhibition of mitochondrial fission benefits from the early treatment of hemorrhagic shock under a hot environment is unclear. An uncontrolled hemorrhagic shock model in rats is used, and the effects of mitochondrial fission inhibitor mdivi-1 on mitochondrial function, organ function, and survival rate of rats are measured. The results show that 0.1-3 mg/kg mdivi-1 antagonizes hemorrhagic shock-induced mitochondrial fragment. In addition, mdivi-1 improves mitochondrial function, and alleviates hemorrhagic shock-induced oxidative stress and inflammation under a hot environment. Further studies show that 0.1-3 mg/kg Mdivi-1 reduces blood loss, and maintains a mean artery pressure (MAP) of 50-60 mmHg before bleeding-stops after hemorrhagic shock, compared with single Lactate Ringer's (LR) resuscitation. Notably, 1 mg/kg of Mdivi-1 extends the time of hypotensive resuscitation to 2-3 h. During 1 or 2 h of ligation, Mdivi-1 prolongs survival time and protects vital organ function by rescuing mitochondrial morphology and improving mitochondrial function. These results suggest Mdivi-1 is suitable for the early treatment of hemorrhagic shock under a hot environment and can extend the golden treatment time to 2-3 hour for hemorrhagic shock under a hot environment.
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Affiliation(s)
- Yue Wu
- State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute of Surgery, Third Military Medical University (Army Medical University), Chongqing, 400042, P. R. China
| | - Yu Zhu
- State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute of Surgery, Third Military Medical University (Army Medical University), Chongqing, 400042, P. R. China
| | - Yuanqun Zhou
- State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute of Surgery, Third Military Medical University (Army Medical University), Chongqing, 400042, P. R. China
| | - Liangming Liu
- State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute of Surgery, Third Military Medical University (Army Medical University), Chongqing, 400042, P. R. China
| | - Tao Li
- State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute of Surgery, Third Military Medical University (Army Medical University), Chongqing, 400042, P. R. China
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Liu MX, Yang J, Qin Y, Li ZD, Jin J, Zhang YB, Yang XJ. ESMOLOL PROTECTS AGAINST LPS-INDUCED CARDIAC INJURY VIA THE AMPK/mTOR/ULK1 PATHWAY IN RAT. Shock 2023; 59:469-476. [PMID: 36579896 DOI: 10.1097/shk.0000000000002071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
ABSTRACT Aim: The purpose of this study was to investigate the effect of esmolol (ES) on LPS-induced cardiac injury and the possible mechanism. Methods: Sepsis was induced by i.p. injection of LPS (10 mg/kg) in male Sprague-Dawley rats pretreated with ES, 3-methyladenine or rapamycin. The severity of myocardial damage was analyzed by hematoxylin-eosin staining, and myocardial damage scores were calculated. The concentration of cardiac troponin was measured by enzyme-linked immunosorbent assay. The expression of autophagy-related proteins (beclin-1, LC3-II, p-AMPK, p-ULK1, p-mTOR) in myocardial tissue was detected by Western blotting. Autophagosome formation and the ultrastructural damage of mitochondria were assessed using transmission electron microscopy. Results: LPS induced an increase in myocardial damage score in a time-dependent manner, accompanied with an increase in autophagy at 3 h and decrease in autophagy at 6, 12, and 24 h. Pretreatment of LPS-treated rats with ES or rapamycin reduced myocardial injury (release of cardiac troponin, myocardial damage score) and increased autophagy (LC3-II, beclin-1, p-AMPK, and p-ULK1 levels and autophagosome numbers) at 12 and 24 h. In contrast, 3-methyladenine showed no effect. Conclusion: Esmolol alleviates LPS-induced myocardial damage through activating the AMPK/mTOR/ULK1 signal pathway-regulated autophagy.
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Affiliation(s)
- Mao-Xia Liu
- Department of Intensive Care Unit, the First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Jia Yang
- Shanxi Academy of Advanced Research and Innovation, Taiyuan, Shanxi China
| | - Yan Qin
- Department of Emergency Medicine, the First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Zheng-da Li
- Department of Intensive Care Unit, the First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Jun Jin
- Department of Intensive Care Unit, the First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Yan-Bing Zhang
- Department of Anesthesiology, the First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Xin-Jing Yang
- Department of Intensive Care Unit, the First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
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10
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The mitochondrial calcium uniporter of pulmonary type 2 cells determines severity of acute lung injury. Nat Commun 2022; 13:5837. [PMID: 36192486 PMCID: PMC9529882 DOI: 10.1038/s41467-022-33543-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Accepted: 09/21/2022] [Indexed: 11/28/2022] Open
Abstract
Acute Lung Injury (ALI) due to inhaled pathogens causes high mortality. Underlying mechanisms are inadequately understood. Here, by optical imaging of live mouse lungs we show that a key mechanism is the viability of cytosolic Ca2+ buffering by the mitochondrial Ca2+ uniporter (MCU) in the lung’s surfactant-secreting, alveolar type 2 cells (AT2). The buffering increased mitochondrial Ca2+ and induced surfactant secretion in wild-type mice, but not in mice with AT2-specific MCU knockout. In the knockout mice, ALI due to intranasal LPS instillation caused severe pulmonary edema and mortality, which were mitigated by surfactant replenishment prior to LPS instillation, indicating surfactant’s protective effect against alveolar edema. In wild-type mice, intranasal LPS, or Pseudomonas aeruginosa decreased AT2 MCU. Loss of MCU abrogated buffering. The resulting mortality was reduced by spontaneous recovery of MCU expression, or by MCU replenishment. Enhancement of AT2 mitochondrial buffering, hence endogenous surfactant secretion, through MCU replenishment might be a therapy against ALI. Acute lung injury caused by inhalation of pathogens leads to mortality, but the mechanisms are unclear. Here, the authors show in mice that that loss of the mitochondrial calcium uniporter (MCU) of alveolar type 2 cells (AT2) impaired mitochondrial Ca2+ buffering and surfactant secretion, and increased mortality, in response to LPS instillation, suggesting the MCU as a potential therapeutic target in ALI.
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11
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Petroni RC, de Oliveira SJS, Fungaro TP, Ariga SKK, Barbeiro HV, Soriano FG, de Lima TM. Short-term Obesity Worsens Heart Inflammation and Disrupts Mitochondrial Biogenesis and Function in an Experimental Model of Endotoxemia. Inflammation 2022; 45:1985-1999. [PMID: 35411498 DOI: 10.1007/s10753-022-01669-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/22/2022] [Accepted: 03/31/2022] [Indexed: 11/28/2022]
Abstract
Cardiomyopathy is a well-known complication of sepsis that may deteriorate when accompanied by obesity. To test this hypothesis we fed C57black/6 male mice for 6 week with a high fat diet (60% energy) and submitted them to endotoxemic shock using E. coli LPS (10 mg/kg). Inflammatory markers (cytokines and adhesion molecules) were determined in plasma and heart tissue, as well as heart mitochondrial biogenesis and function. Obesity markedly shortened the survival rate of mouse after LPS injection and induced a persistent systemic inflammation since TNFα, IL-1β, IL-6 and resistin plasma levels were higher 24 h after LPS injection. Heart tissue inflammation was significantly higher in obese mice, as detected by elevated mRNA expression of pro-inflammatory cytokines (IL-1β, IL-6 and TNFα). Obese animals presented reduced maximum respiratory rate after LPS injection, however fatty acid oxidation increased in both groups. LPS decreased mitochondrial DNA content and mitochondria biogenesis factors, such as PGC1α and PGC1β, in both groups, while NRF1 expression was significantly stimulated in obese mice hearts. Mitochondrial fusion/fission balance was only altered by obesity, with no influence of endotoxemia. Obesity accelerated endotoxemia death rate due to higher systemic inflammation and decreased heart mitochondrial respiratory capacity.
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Affiliation(s)
- Ricardo Costa Petroni
- Emergency Medicine Department, Medical School, University of São Paulo, Av. Dr. Arnaldo, 455 - Cerqueira César, São Paulo, São Paulo, CEP, 01246-903, Brazil
| | - Suelen Jeronymo Souza de Oliveira
- Emergency Medicine Department, Medical School, University of São Paulo, Av. Dr. Arnaldo, 455 - Cerqueira César, São Paulo, São Paulo, CEP, 01246-903, Brazil
| | - Thais Pineda Fungaro
- Emergency Medicine Department, Medical School, University of São Paulo, Av. Dr. Arnaldo, 455 - Cerqueira César, São Paulo, São Paulo, CEP, 01246-903, Brazil
| | - Suely K K Ariga
- Emergency Medicine Department, Medical School, University of São Paulo, Av. Dr. Arnaldo, 455 - Cerqueira César, São Paulo, São Paulo, CEP, 01246-903, Brazil
| | - Hermes Vieira Barbeiro
- Emergency Medicine Department, Medical School, University of São Paulo, Av. Dr. Arnaldo, 455 - Cerqueira César, São Paulo, São Paulo, CEP, 01246-903, Brazil
| | - Francisco Garcia Soriano
- Emergency Medicine Department, Medical School, University of São Paulo, Av. Dr. Arnaldo, 455 - Cerqueira César, São Paulo, São Paulo, CEP, 01246-903, Brazil
| | - Thais Martins de Lima
- Emergency Medicine Department, Medical School, University of São Paulo, Av. Dr. Arnaldo, 455 - Cerqueira César, São Paulo, São Paulo, CEP, 01246-903, Brazil.
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12
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Wei L, Shi J. Insight Into Rho Kinase Isoforms in Obesity and Energy Homeostasis. Front Endocrinol (Lausanne) 2022; 13:886534. [PMID: 35769086 PMCID: PMC9234286 DOI: 10.3389/fendo.2022.886534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 05/06/2022] [Indexed: 11/13/2022] Open
Abstract
Obesity and associated complications increasingly jeopardize global health and contribute to the rapidly rising prevalence of type 2 diabetes mellitus and obesity-related diseases. Developing novel methods for the prevention and treatment of excess body adipose tissue expansion can make a significant contribution to public health. Rho kinase is a Rho-associated coiled-coil-containing protein kinase (Rho kinase or ROCK). The ROCK family including ROCK1 and ROCK2 has recently emerged as a potential therapeutic target for the treatment of metabolic disorders. Up-regulated ROCK activity has been involved in the pathogenesis of all aspects of metabolic syndrome including obesity, insulin resistance, dyslipidemia and hypertension. The RhoA/ROCK-mediated actin cytoskeleton dynamics have been implicated in both white and beige adipogenesis. Studies using ROCK pan-inhibitors in animal models of obesity, diabetes, and associated complications have demonstrated beneficial outcomes. Studies via genetically modified animal models further established isoform-specific roles of ROCK in the pathogenesis of metabolic disorders including obesity. However, most reported studies have been focused on ROCK1 activity during the past decade. Due to the progress in developing ROCK2-selective inhibitors in recent years, a growing body of evidence indicates more attention should be devoted towards understanding ROCK2 isoform function in metabolism. Hence, studying individual ROCK isoforms to reveal their specific roles and principal mechanisms in white and beige adipogenesis, insulin sensitivity, energy balancing regulation, and obesity development will facilitate significant breakthroughs for systemic treatment with isoform-selective inhibitors. In this review, we give an overview of ROCK functions in the pathogenesis of obesity and insulin resistance with a particular focus on the current understanding of ROCK isoform signaling in white and beige adipogenesis, obesity and thermogenesis in adipose tissue and other major metabolic organs involved in energy homeostasis regulation.
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Affiliation(s)
- Lei Wei
- *Correspondence: Lei Wei, ; Jianjian Shi,
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13
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Zhu Y, Kuang L, Wu Y, Deng H, She H, Zhou Y, Zhang J, Liu L, Li T. Protective Effects of Inhibition of Mitochondrial Fission on Organ Function After Sepsis. Front Pharmacol 2021; 12:712489. [PMID: 34566637 PMCID: PMC8457550 DOI: 10.3389/fphar.2021.712489] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 08/26/2021] [Indexed: 01/10/2023] Open
Abstract
Sepsis-associated organ dysfunction plays a critical role in its high mortality, mainly in connection with mitochondrial dysfunction. Whether the inhibition of mitochondrial fission is beneficial to sepsis-related organ dysfunction and underlying mechanisms are unknown. Cecal ligation and puncture induced sepsis in rats and dynamic related protein 1 knockout mice, lipopolysaccharide-treated vascular smooth muscle cells and cardiomyocytes, were used to explore the effects of inhibition of mitochondrial fission and specific mechanisms. Our study showed that mitochondrial fission inhibitor Mdivi-1 could antagonize sepsis-induced organ dysfunction including heart, vascular smooth muscle, liver, kidney, and intestinal functions, and prolonged animal survival. The further study showed that mitochondrial functions such as mitochondrial membrane potential, adenosine-triphosphate contents, reactive oxygen species, superoxide dismutase and malonaldehyde were recovered after Mdivi-1 administration via improving mitochondrial morphology. And sepsis-induced inflammation and apoptosis in heart and vascular smooth muscle were alleviated through inhibition of mitochondrial fission and mitochondrial function improvement. The parameter trends in lipopolysaccharide-stimulated cardiomyocytes and vascular smooth muscle cells were similar in vivo. Dynamic related protein 1 knockout preserved sepsis-induced organ dysfunction, and the animal survival was prolonged. Taken together, this finding provides a novel effective candidate therapy for severe sepsis/septic shock and other critical clinical diseases.
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Affiliation(s)
- Yu Zhu
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Lei Kuang
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Yue Wu
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Haoyue Deng
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Han She
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Yuanqun Zhou
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Jie Zhang
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Liangming Liu
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Tao Li
- State Key Laboratory of Trauma, Burns and Combined Injury, Shock and Transfusion Department, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
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14
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Rho-Proteins and Downstream Pathways as Potential Targets in Sepsis and Septic Shock: What Have We Learned from Basic Research. Cells 2021; 10:cells10081844. [PMID: 34440613 PMCID: PMC8391638 DOI: 10.3390/cells10081844] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 07/09/2021] [Accepted: 07/15/2021] [Indexed: 01/19/2023] Open
Abstract
Sepsis and septic shock are associated with acute and sustained impairment in the function of the cardiovascular system, kidneys, lungs, liver, and brain, among others. Despite the significant advances in prevention and treatment, sepsis and septic shock sepsis remain global health problems with elevated mortality rates. Rho proteins can interact with a considerable number of targets, directly affecting cellular contractility, actin filament assembly and growing, cell motility and migration, cytoskeleton rearrangement, and actin polymerization, physiological functions that are intensively impaired during inflammatory conditions, such as the one that occurs in sepsis. In the last few decades, Rho proteins and their downstream pathways have been investigated in sepsis-associated experimental models. The most frequently used experimental design included the exposure to bacterial lipopolysaccharide (LPS), in both in vitro and in vivo approaches, but experiments using the cecal ligation and puncture (CLP) model of sepsis have also been performed. The findings described in this review indicate that Rho proteins, mainly RhoA and Rac1, are associated with the development of crucial sepsis-associated dysfunction in different systems and cells, including the endothelium, vessels, and heart. Notably, the data found in the literature suggest that either the inhibition or activation of Rho proteins and associated pathways might be desirable in sepsis and septic shock, accordingly with the cellular system evaluated. This review included the main findings, relevance, and limitations of the current knowledge connecting Rho proteins and sepsis-associated experimental models.
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15
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Wasyluk W, Nowicka-Stążka P, Zwolak A. Heart Metabolism in Sepsis-Induced Cardiomyopathy-Unusual Metabolic Dysfunction of the Heart. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18147598. [PMID: 34300048 PMCID: PMC8303349 DOI: 10.3390/ijerph18147598] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 06/26/2021] [Accepted: 07/02/2021] [Indexed: 12/11/2022]
Abstract
Due to the need for continuous work, the heart uses up to 8% of the total energy expenditure. Due to the relatively low adenosine triphosphate (ATP) storage capacity, the heart's work is dependent on its production. This is possible due to the metabolic flexibility of the heart, which allows it to use numerous substrates as a source of energy. Under normal conditions, a healthy heart obtains approximately 95% of its ATP by oxidative phosphorylation in the mitochondria. The primary source of energy is fatty acid oxidation, the rest of the energy comes from the oxidation of pyruvate. A failed heart is characterised by a disturbance in these proportions, with the contribution of individual components as a source of energy depending on the aetiology and stage of heart failure. A unique form of cardiac dysfunction is sepsis-induced cardiomyopathy, characterised by a significant reduction in energy production and impairment of cardiac oxidation of both fatty acids and glucose. Metabolic disorders appear to contribute to the pathogenesis of cardiac dysfunction and therefore are a promising target for future therapies. However, as many aspects of the metabolism of the failing heart remain unexplained, this issue requires further research.
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Affiliation(s)
- Weronika Wasyluk
- Chair of Internal Medicine and Department of Internal Medicine in Nursing, Faculty of Health Sciences, Medical University of Lublin, 20-093 Lublin, Poland; (P.N.-S.); (A.Z.)
- Doctoral School, Medical University of Lublin, 20-093 Lublin, Poland
- Correspondence:
| | - Patrycja Nowicka-Stążka
- Chair of Internal Medicine and Department of Internal Medicine in Nursing, Faculty of Health Sciences, Medical University of Lublin, 20-093 Lublin, Poland; (P.N.-S.); (A.Z.)
| | - Agnieszka Zwolak
- Chair of Internal Medicine and Department of Internal Medicine in Nursing, Faculty of Health Sciences, Medical University of Lublin, 20-093 Lublin, Poland; (P.N.-S.); (A.Z.)
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16
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Preau S, Vodovar D, Jung B, Lancel S, Zafrani L, Flatres A, Oualha M, Voiriot G, Jouan Y, Joffre J, Huel F, De Prost N, Silva S, Azabou E, Radermacher P. Energetic dysfunction in sepsis: a narrative review. Ann Intensive Care 2021; 11:104. [PMID: 34216304 PMCID: PMC8254847 DOI: 10.1186/s13613-021-00893-7] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 06/24/2021] [Indexed: 02/07/2023] Open
Abstract
Background Growing evidence associates organ dysfunction(s) with impaired metabolism in sepsis. Recent research has increased our understanding of the role of substrate utilization and mitochondrial dysfunction in the pathophysiology of sepsis-related organ dysfunction. The purpose of this review is to present this evidence as a coherent whole and to highlight future research directions. Main text Sepsis is characterized by systemic and organ-specific changes in metabolism. Alterations of oxygen consumption, increased levels of circulating substrates, impaired glucose and lipid oxidation, and mitochondrial dysfunction are all associated with organ dysfunction and poor outcomes in both animal models and patients. The pathophysiological relevance of bioenergetics and metabolism in the specific examples of sepsis-related immunodeficiency, cerebral dysfunction, cardiomyopathy, acute kidney injury and diaphragmatic failure is also described. Conclusions Recent understandings in substrate utilization and mitochondrial dysfunction may pave the way for new diagnostic and therapeutic approaches. These findings could help physicians to identify distinct subgroups of sepsis and to develop personalized treatment strategies. Implications for their use as bioenergetic targets to identify metabolism- and mitochondria-targeted treatments need to be evaluated in future studies. Supplementary Information The online version contains supplementary material available at 10.1186/s13613-021-00893-7.
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Affiliation(s)
- Sebastien Preau
- U1167 - RID-AGE - Facteurs de Risque et Déterminants Moléculaires des Maladies Liées au Vieillissement, University Lille, Inserm, CHU Lille, Institut Pasteur de Lille, F-59000, Lille, France.
| | - Dominique Vodovar
- Centre AntiPoison de Paris, Hôpital Fernand Widal, APHP, 75010, Paris, France.,Faculté de pharmacie, UMRS 1144, 75006, Paris, France.,Université de Paris, UFR de Médecine, 75010, Paris, France
| | - Boris Jung
- Medical Intensive Care Unit, Lapeyronie Teaching Hospital, Montpellier University Hospital and PhyMedExp, University of Montpellier, Montpellier, France
| | - Steve Lancel
- U1167 - RID-AGE - Facteurs de Risque et Déterminants Moléculaires des Maladies Liées au Vieillissement, University Lille, Inserm, CHU Lille, Institut Pasteur de Lille, F-59000, Lille, France
| | - Lara Zafrani
- Médecine Intensive Réanimation, Hôpital Saint-Louis, AP-HP, Université de Paris, Paris, France.,INSERM UMR 976, Hôpital Saint Louis, Université de Paris, Paris, France
| | | | - Mehdi Oualha
- Pediatric Intensive Care Unit, Necker Hospital, APHP, Centre - Paris University, Paris, France
| | - Guillaume Voiriot
- Service de Médecine Intensive Réanimation, Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Hôpital Tenon, Paris, France
| | - Youenn Jouan
- Service de Médecine Intensive Réanimation, CHRU Tours, Tours, France.,Faculté de Médecine de Tours, INSERM U1100 Centre d'Etudes des Pathologies Respiratoires, Tours, France
| | - Jeremie Joffre
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, 94143, USA
| | - Fabrice Huel
- Réanimation médico-chirurgicale, Université de Paris, Assistance Publique - Hôpitaux de Paris, Hôpital Louis Mourier, Paris, France
| | - Nicolas De Prost
- Service de Réanimation Médicale, Hôpital Henri Mondor, Assistance Publique-Hôpitaux de Paris, Cedex 94010, Créteil, France
| | - Stein Silva
- Réanimation URM CHU Purpan, Cedex 31300, Toulouse, France.,Toulouse NeuroImaging Center INSERM1214, Cedex 31300, Toulouse, France
| | - Eric Azabou
- Clinical Neurophysiology and Neuromodulation Unit, Departments of Physiology and Critical Care Medicine, Raymond Poincaré Hospital, AP-HP, Inserm UMR 1173, Infection and Inflammation (2I), University of Versailles (UVSQ), Paris-Saclay University, Paris, France
| | - Peter Radermacher
- Institut für Anästhesiologische Pathophysiologie und Verfahrensentwicklung, Universitätsklinikum, Ulm, Germany
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17
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Wang Z, Liu M, Ye D, Ye J, Wang M, Liu J, Xu Y, Zhang J, Zhao M, Feng Y, Xu S, Pan W, Luo Z, Li D, Wan J. Il12a Deletion Aggravates Sepsis-Induced Cardiac Dysfunction by Regulating Macrophage Polarization. Front Pharmacol 2021; 12:632912. [PMID: 34276358 PMCID: PMC8284189 DOI: 10.3389/fphar.2021.632912] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 03/17/2021] [Indexed: 12/12/2022] Open
Abstract
Cardiac dysfunction is a well-recognized complication of sepsis and is associated with the outcome and prognosis of septic patients. Evidence suggests that Il12a participates in the regulation of various cardiovascular diseases, including heart failure, hypertension and acute myocardial infarction. However, the effects of Il12a in sepsis-induced cardiac dysfunction remain unknown. In our study, lipopolysaccharide (LPS) and cecal ligation and puncture (CLP) model were used to mimic sepsis, and cardiac Il12a expression was assessed. In addition, Il12a knockout mice were used to detect the role of Il12a in sepsis-related cardiac dysfunction. We observed for the first time that Il12a expression is upregulated in mice after LPS treatment and macrophages were the main sources of Il12a. In addition, our findings demonstrated that Il12a deletion aggravates LPS-induced cardiac dysfunction and injury, as evidenced by the increased serum and cardiac levels of lactate dehydrogenase (LDH) and cardiac creatine kinase-myocardial band (CK-MB). Moreover, Il12a deletion enhances LPS-induced macrophage accumulation and drives macrophages toward the M1 phenotype in LPS-treated mice. Il12a deletion also downregulated the activity of AMP-activated protein kinase (AMPK) but increased the phosphorylation levels of p65 (p-p65) and NF-κB inhibitor alpha (p-IκBα). In addition, Il12a deletion aggravates CLP-induced cardiac dysfunction and injury. Treatment with the AMPK activator AICAR abolishes the deterioration effect of Il12a deletion on LPS-induced cardiac dysfunction. In conclusion, Il12a deletion aggravated LPS-induced cardiac dysfunction and injury by exacerbating the imbalance of M1 and M2 macrophages. Our data provide evidence that Il12a may represent an attractive target for sepsis-induced cardiac dysfunction.
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Affiliation(s)
- Zhen Wang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Menglin Liu
- Department of Emergency, Renmin Hospital of Wuhan University, Wuhan, China
| | - Di Ye
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Jing Ye
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Menglong Wang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Jianfang Liu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Yao Xu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Jishou Zhang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Mengmeng Zhao
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Yongqi Feng
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Shuwan Xu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Wei Pan
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Zhen Luo
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Dan Li
- Department of Pediatrics, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Jun Wan
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Cardiovascular Research Institute, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Cardiology, Wuhan, China
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18
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Sepsis-Induced Myocardial Dysfunction (SIMD): the Pathophysiological Mechanisms and Therapeutic Strategies Targeting Mitochondria. Inflammation 2021; 43:1184-1200. [PMID: 32333359 DOI: 10.1007/s10753-020-01233-w] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Sepsis is a lethal syndrome with multiple organ failure caused by an inappropriate host response to infection. Cardiac dysfunction is one of the important complications of sepsis, termed sepsis-induced myocardial dysfunction (SIMD), which is characterized by systolic and diastolic dysfunction of both sides of the heart. Mechanisms that contribute to SIMD include an excessive inflammatory response, altered circulatory, microvascular status, nitric oxide (NO) synthesis impairment, endothelial dysfunction, disorders of calcium regulation, cardiac autophagy anomaly, autonomic nervous system dysregulation, metabolic reprogramming, and mitochondrial dysfunction. The role of mitochondrial dysfunction, which is characterized by structural abnormalities, increased oxidative stress, abnormal opening of the mitochondrial permeability transition pore (mPTP), mitochondrial uncoupling, and disordered quality control systems, has been gaining increasing attention as a central player in the pathophysiology of SIMD. The disruption of homeostasis within the organism induced by mitochondrial dysfunction may also be an important aspect of SIMD development. In addition, an emerging therapy strategy targeting mitochondria, namely, metabolic resuscitation, seems promising. The current review briefly introduces the mechanism of SIMD, highlights how mitochondrial dysfunction contributes to SIMD, and discusses the role of metabolic resuscitation in the treatment of SIMD.
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19
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Liu H, Fafeng, Cheng, Tang F, Wang Y, Liu S, Wang X. Paeoniflorin inhibits lipopolysaccharide-induced inflammation in LO2 cells by regulating RhoA/NLRP3 pathway. JOURNAL OF TRADITIONAL CHINESE MEDICAL SCIENCES 2021. [DOI: 10.1016/j.jtcms.2021.06.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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20
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Jianjun Z, Baochun Z, Limei M, Lijun L. Exploring the beneficial role of ROCK inhibitors in sepsis-induced cerebral and cognitive injury in rats. Fundam Clin Pharmacol 2021; 35:882-891. [PMID: 33440039 DOI: 10.1111/fcp.12645] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 12/28/2020] [Accepted: 01/08/2021] [Indexed: 11/29/2022]
Abstract
Sepsis-induced cerebral injury is a systemic inflammatory response associated with high mortality rate and cognitive impairment. Rho/ROCK pathway activation is involved in initiating the inflammatory response and promoting cerebral dysfunction. The present study explored the beneficial effects of ROCK inhibitors in sepsis-induced cerebral injury and cognitive impairment in rats. The model of sepsis was established by employing cecal ligation and puncture (CLP). CLP significantly augmented cerebral injury assessed in terms of intensified activity of caspases-3 and decrease in BCL-2 in the brain along with the release of S100β and NSE, and assessed on day 7. Significant increase in inflammatory biomarkers IL-1β and TNF-α as well as increase in the protein levels of ROCK1 and ROCK2 was observed in the brain. A significant decrease in learning and memory ability was observed because of increased escape latency time on day 4 and significant decrease in time spent in the target quadrant on day 7 in CLP-subjected rats. Administration of nonselective ROCK inhibitor, fasudil (10 and 30 mg/kg), and selective ROCK1 inhibitor, Y27632 (10 and 30 mg/kg), attenuated the sepsis-induced increase in the S100β and NSE, IL-1β, TNF-α, BCL-2, caspase-3, ROCK1 and ROCK2 in septic rats and significantly memory and learning.The beneficial effects of Y27632 and fasudil were comparable suggesting the key role of ROCK1 in sepsis-induced deleterious effects. It may be concluded that sepsis may increase cerebral and cognitive injury through Rho-kinase/ROCK pathway in septic rats, and ROCK inhibitors may be potentially employed to overcome sepsis-induced deleterious effects in the brain.
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Affiliation(s)
- Zhu Jianjun
- Intensive Care Unit, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Zhou Baochun
- Intensive Care Unit, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Ma Limei
- Intensive Care Unit, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Liu Lijun
- Intensive Care Unit, The Second Affiliated Hospital of Soochow University, Suzhou, China
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21
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Tan Y, Xia F, Li L, Peng X, Liu W, Zhang Y, Fang H, Zeng Z, Chen Z. Novel Insights into the Molecular Features and Regulatory Mechanisms of Mitochondrial Dynamic Disorder in the Pathogenesis of Cardiovascular Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:6669075. [PMID: 33688392 PMCID: PMC7914101 DOI: 10.1155/2021/6669075] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 01/26/2021] [Accepted: 02/08/2021] [Indexed: 12/20/2022]
Abstract
Mitochondria maintain mitochondrial homeostasis through continuous fusion and fission, that is, mitochondrial dynamics, which is precisely mediated by mitochondrial fission and fusion proteins, including dynamin-related protein 1 (Drp1), mitofusin 1 and 2 (Mfn1/2), and optic atrophy 1 (OPA1). When the mitochondrial fission and fusion of cardiomyocytes are out of balance, they will cause their own morphology and function disorders, which damage the structure and function of the heart, are involved in the occurrence and progression of cardiovascular disease such as ischemia-reperfusion injury (IRI), septic cardiomyopathy, and diabetic cardiomyopathy. In this paper, we focus on the latest findings regarding the molecular features and regulatory mechanisms of mitochondrial dynamic disorder in cardiovascular pathologies. Finally, we will address how these findings can be applied to improve the treatment of cardiovascular disease.
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Affiliation(s)
- Ying Tan
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Fengfan Xia
- Department of Cardiology, Shunde Hospital, Southern Medical University (The First People's Hospital of Shunde Foshan), Foshan, 528300 Guangdong, China
| | - Lulan Li
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Xiaojie Peng
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Wenqian Liu
- Department of Critical Care Medicine, Huiqiao Medical Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Yaoyuan Zhang
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Haihong Fang
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, 1838 Guangzhou Ave N, Guangzhou 510515, China
| | - Zhenhua Zeng
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Zhongqing Chen
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
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22
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Islam MN, Gusarova GA, Das SR, Li L, Monma E, Anjaneyulu M, Owusu-Ansah E, Bhattacharya S, Bhattacharya J. The Mitochondrial Calcium Uniporter of Pulmonary Type 2 Cells Determines Severity of ARDS. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2021. [PMID: 33469582 DOI: 10.1101/2021.01.18.427173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Acute lung immunity to inhaled pathogens elicits defensive pneumonitis that may convert to the Acute Respiratory Distress Syndrome (ARDS), causing high mortality. Mechanisms underlying the conversion are not understood, but are of intense interest because of the ARDS-induced mortality in the ongoing Covid-19 pandemic. Here, by optical imaging of live lungs we show that key to the lethality is the functional status of mitochondrial Ca2+ buffering across the mitochondrial Ca2+ uniporter (MCU) in the alveolar type 2 cells (AT2), which protect alveolar stability. In mice subjected to ARDS by airway exposure to lipopolysaccharide (LPS), or to Pseudomonas aeruginosa, there was marked loss of MCU expression in AT2. The ability of mice to survive ARDS depended on the extent to which the MCU expression recovered, indicating that the viability of Ca2+ buffering by AT2 mitochondria critically determines ARDS severity. Mitochondrial transfer to enhance AT2 MCU expression might protect against ARDS.
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Zhang S, Xu Y, Zhu J, Ma J, Niu Q, Wang X. Carbon monoxide attenuates LPS-induced myocardial dysfunction in rats by regulating the mitochondrial dynamic equilibrium. Eur J Pharmacol 2020; 889:173726. [PMID: 33159931 DOI: 10.1016/j.ejphar.2020.173726] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 10/30/2020] [Accepted: 11/01/2020] [Indexed: 01/07/2023]
Abstract
Lipopolysaccharide (LPS) induces myocardial dysfunction by damaging the mitochondrial structure in cardiomyocytes. Since low levels of carbon monoxide can confer cytoprotective effects against end-organ damage from endotoxic shock, we tested whether treatment with carbon monoxide-releasing molecule-2 (CORM-2) could ameliorate LPS-induced myocardial dysfunction in rats by maintaining the dynamic equilibrium between the mitochondrial fusion and fission processes. Cardiac function, myocardial histopathology, myocardial enzymes, and changes in myocardial mitochondrial function and mitochondrial fusion-fission protein expression were assessed in rats. The mitochondrial structure and morphology were studied by electron microscopy, and the expression levels of key proteins involved in the mitochondrial dynamics were assessed by Western blot assay. Cardiac dysfunction and increased myocardial enzyme activity together with myocardial pathological damage, mitochondrial dysfunction, and impaired mitochondrial dynamics homeostasis were observed in the LPS-challenged septic rats. However, these observations were reversed by CORM-2, which effectively inhibited cardiac and mitochondrial damage in the LPS-challenged rats and improved the survival rate of the animals. In conclusion, CORM-2 regulates the LPS-induced imbalance of the dynamic mitochondrial fusion and fission processes, thereby effectively ameliorating the LPS-induced myocardial dysfunction and improving the survival of the rats.
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Affiliation(s)
- Sheng Zhang
- Department of Critical Care Medicine, General Hospital of Ningxia Medical University, Yinchuan, 750004, Ningxia Hui Autonomous Region, People's Republic of China; Cangzhou Central Hospital, Cangzhou, 061000, Hebei Province, People's Republic of China
| | - Yanping Xu
- Department of Cardiac Functions Examination, General Hospital of Ningxia Medical University, Yinchuan, 750004, Ningxia Hui Autonomous Region, People's Republic of China
| | - Jinyuan Zhu
- Department of Critical Care Medicine, General Hospital of Ningxia Medical University, Yinchuan, 750004, Ningxia Hui Autonomous Region, People's Republic of China
| | - Jinlan Ma
- Ningxia Medical University, Yinchuan, 750004, People's Republic of China
| | - Qingsheng Niu
- Ningxia Medical University, Yinchuan, 750004, People's Republic of China
| | - Xiaohong Wang
- Department of Critical Care Medicine, General Hospital of Ningxia Medical University, Yinchuan, 750004, Ningxia Hui Autonomous Region, People's Republic of China.
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24
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Autophagy is involved in the protective effect of p21 on LPS-induced cardiac dysfunction. Cell Death Dis 2020; 11:554. [PMID: 32694519 PMCID: PMC7374585 DOI: 10.1038/s41419-020-02765-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 06/12/2020] [Accepted: 06/15/2020] [Indexed: 12/18/2022]
Abstract
p21 has emerged as an important protein involved in cardiovascular diseases, but its role remains controversial. Recently, p21 has been reported to mediate inflammatory responses. As inflammatory responses are a feature of sepsis, our study investigated whether p21 has a role in cardiac dysfunction induced by sepsis and analyzed the mechanisms involved. To establish a mouse sepsis model, p21 global knockout (p21KO) and C57BL/6J wild-type (WT) male mice were treated with 5 mg/kg LPS intraperitoneally for 6, 24, or 48 h. After LPS stimulation, the level of p21 had significantly increased in the WT mice and in cardiomyocytes. Cardiac dysfunction induced by LPS was markedly aggravated in p21KO mice relative to that of WT mice. Downregulation of p21 expression exacerbated the LPS-mediated inflammatory response, and it increased oxidative stress as well as mitochondrial damage in the heart and in cardiomyocytes. In contrast, overexpressing p21 attenuated the increase of TNFα and promoted the increase of SOD2. Moreover, p21 regulated the LPS-induced autophagy activation; that is, the increase in autophagy was impaired when p21 expression was decreased, whereas the increase was significant when p21 was overexpressed. The autophagy inducer rapamycin partially rescued the cardiac deterioration caused by p21 downregulation in the LPS-stimulated groups. In addition, p21 regulated the autophagy level by interacting with LC3B. These results revealed that p21 controls LPS-induced cardiac dysfunction by modulating inflammatory and oxidative stress, and it is partially dependent on regulating the autophagy level. This study is the first to show that p21 could interact with LC3B to promote autophagy for the improvement of cardiac function during sepsis.
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25
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Fan H, He Z, Huang H, Zhuang H, Liu H, Liu X, Yang S, He P, Yang H, Feng D. Mitochondrial Quality Control in Cardiomyocytes: A Critical Role in the Progression of Cardiovascular Diseases. Front Physiol 2020; 11:252. [PMID: 32292354 PMCID: PMC7119225 DOI: 10.3389/fphys.2020.00252] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 03/05/2020] [Indexed: 12/11/2022] Open
Abstract
Mitochondria serve as an energy plant and participate in a variety of signaling pathways to regulate cellular metabolism, survival and immunity. Mitochondrial dysfunction, in particular in cardiomyocytes, is associated with the development and progression of cardiovascular disease, resulting in heart failure, cardiomyopathy, and cardiac ischemia/reperfusion injury. Therefore, mitochondrial quality control processes, including post-translational modifications of mitochondrial proteins, mitochondrial dynamics, mitophagy, and formation of mitochondrial-driven vesicles, play a critical role in maintenance of mitochondrial and even cellular homeostasis in physiological or pathological conditions. Accumulating evidence suggests that mitochondrial quality control in cardiomyocytes is able to improve cardiac function, rescue dying cardiomyocytes, and prevent the deterioration of cardiovascular disease upon external environmental stress. In this review, we discuss recent progress in understanding mitochondrial quality control in cardiomyocytes. We also evaluate potential targets to prevent or treat cardiovascular diseases, and highlight future research directions which will help uncover additional mechanisms underlying mitochondrial homeostasis in cardiomyocytes.
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Affiliation(s)
- Hualin Fan
- Guangdong Provincial People's Hospital, School of Medicine, South China University of Technology, Guangzhou, China.,Guangzhou Municipal and Guangdong Provincial Key Laboratory of Protein Modification and Degradation, State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, China
| | - Zhengjie He
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Protein Modification and Degradation, State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, China
| | - Haofeng Huang
- Institute of Neurology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, China
| | - Haixia Zhuang
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Protein Modification and Degradation, State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, China
| | - Hao Liu
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Protein Modification and Degradation, State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, China
| | - Xiao Liu
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Protein Modification and Degradation, State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, China
| | - Sijun Yang
- ABSL-Laboratory at the Center for Animal Experiment and Institute of Animal Model for Human Disease, Wuhan University School of Medicine, Wuhan, China
| | - Pengcheng He
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial Key Laboratory of Coronary Heart Disease Prevention, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Huan Yang
- Department of Pulmonary and Critical Care Medicine, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, China
| | - Du Feng
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Protein Modification and Degradation, State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, China.,The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan People's Hospital, Guangzhou Medical University, Guangzhou, China
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26
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Kang W, Cheng Y, Wang X, Zhou F, Zhou C, Wang L, Zhong L. Neuregulin‑1: An underlying protective force of cardiac dysfunction in sepsis (Review). Mol Med Rep 2020; 21:2311-2320. [PMID: 32236630 PMCID: PMC7185085 DOI: 10.3892/mmr.2020.11034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Accepted: 03/04/2020] [Indexed: 11/10/2022] Open
Abstract
Neuregulin-1 (NRG-1) is a type of epidermal growth factor-like protein primarily distributed in the nervous and cardiovascular systems. When sepsis occurs, the incidence of cardiac dysfunction in myocardial injury is high and the mechanism is complicated. It directly causes myocardial cell damage, whilst also causing damage to the structure and function of myocardial cells, weakening of endothelial function and coronary microcirculation, autonomic dysfunction, and activation of myocardial inhibitory factors. Studies investigating NRG-1 have been performed using a variety of methods, including in vitro models, and animal and human clinical trials; however, the results are not consistent. NRG-1/ErbBs signaling is involved in a variety of cardiac processes, from the development of the myocardium and cardiac conduction systems to the promotion of angiogenesis in cardiomyocytes, and in cardio-protective effects during injury. NRG-1 may exert a multifaceted cardiovascular protective effect by activating NRG-1/ErbBs signaling and regulating multiple downstream signaling pathways, thereby improving myocardial cell dysfunction in sepsis, and protecting cardiomyocytes and endothelial cells. It may alleviate myocardial microvascular endothelial injury in sepsis; its anti-inflammatory effects inhibit the production of myocardial inhibitory factors in sepsis, improve myocardial ischemia, decrease oxidative stress, regulate the disruption to the homeostasis of the autonomic nervous system, improve diastolic function, and offer protective effects at multiple target sites. As the mechanism of action of NRG-1 intersects with the pathways involved in the pathogenesis of sepsis, it may be applicable as a treatment strategy to numerous pathological processes in sepsis.
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Affiliation(s)
- Wen Kang
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Yue Cheng
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Xi Wang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Fang Zhou
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Chenliang Zhou
- Department of Critical Care Medicine, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Long Wang
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Liang Zhong
- Department of Anesthesiology, Wuhan Medical and Healthcare Center for Women and Children, Wuhan, Hubei 430060, P.R. China
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27
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Di S, Wang Z, Hu W, Yan X, Ma Z, Li X, Li W, Gao J. The Protective Effects of Melatonin Against LPS-Induced Septic Myocardial Injury: A Potential Role of AMPK-Mediated Autophagy. Front Endocrinol (Lausanne) 2020; 11:162. [PMID: 32373063 PMCID: PMC7176935 DOI: 10.3389/fendo.2020.00162] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Accepted: 03/09/2020] [Indexed: 12/12/2022] Open
Abstract
Aim: Melatonin is an indolamine secreted by the pineal gland, as well as most of the organs and tissues. In addition to regulating circadian biology, studies have confirmed the multiple pharmacological effects of melatonin. Melatonin provides a strong defense against septic myocardial injury. However, the underlying mechanism has not been fully described. In this study, we investigated the protective effects of melatonin against lipopolysaccharide (LPS)-induced myocardial injury as well as the mechanisms involved. Methods: Mice were intraperitoneally injected with LPS to induce a septic myocardial injury model or an LPS shock model, depending on the dose of LPS. Melatonin was given (20 mg/kg/day, via intraperitoneal injection) for a week prior to LPS insult. 6 h after LPS injection, echocardiographic analysis, TUNEL staining, transmission electron microscopy (TEM), western blot, quantitative real-time PCR and ELISA were used to investigate the protective effects of melatonin against LPS induced myocardial injury. AMPK inhibitor, autophagy activator and inhibitor, siRNAs were used for further validation. Results: Survival test showed that melatonin significantly increased the survival rate after LPS-induced shock. In the sepsis model, melatonin markedly ameliorated myocardial dysfunction, decreased the release of inflammatory cytokines, activated AMP-activated protein kinase (AMPK), improved mitochondrial function, and activated autophagy. To confirm whether the protection of melatonin was mediated by AMPK and autophagy, Compound C, an AMPK inhibitor; 3-MA, an autophagy inhibitor; and Rapamycin (Rapa), an autophagy activator, were used in this study. AMPK inhibition down-regulated autophagy, abolished protection of melatonin, as indicated by significantly decreased cardiac function, increased inflammation and damaged mitochondrial function. Furthermore, autophagy inhibition by 3-MA significantly impaired the protective effects of melatonin, whereas autophagy activation by Rapa reversed LPS + Compound C induced myocardial injury. In addition, in vitro studies further confirmed the protection of melatonin against LPS-induced myocardial injury and the mechanisms involving AMPK-mediated autophagy signaling. Conclusions: In summary, our results demonstrated that melatonin protects against LPS-induced septic myocardial injury by activating AMPK mediated autophagy pathway.
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Affiliation(s)
- Shouyin Di
- Department of Geriatrics, Xijing Hospital, The Fourth Military Medical University, Xi'an, China
- Department of Thoracic Surgery, Sixth Medical Center of PLA General Hospital, Beijing, China
- Department of Thoracic Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China
| | - Zheng Wang
- Department of Cardiothoracic Surgery, Central Theater Command General Hospital of Chinese People's Liberation Army, Wuhan, China
| | - Wei Hu
- Department of Immunology, The Fourth Military Medical University, Xi'an, China
| | - Xiaolong Yan
- Department of Thoracic Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China
| | - Zhiqiang Ma
- Department of Thoracic Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China
| | - Xiaofei Li
- Department of Thoracic Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China
| | - Weimiao Li
- Department of Oncology, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
- *Correspondence: Weimiao Li
| | - Jianyuan Gao
- Department of Geriatrics, Xijing Hospital, The Fourth Military Medical University, Xi'an, China
- Jianyuan Gao
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28
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Tan Y, Chen S, Zhong J, Ren J, Dong M. Mitochondrial Injury and Targeted Intervention in Septic Cardiomyopathy. Curr Pharm Des 2019; 25:2060-2070. [PMID: 31284854 DOI: 10.2174/1381612825666190708155400] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 06/20/2019] [Indexed: 12/31/2022]
Abstract
Background:
Sepsis and septic shock are known to prompt multiple organ failure including cardiac
contractile dysfunction, which is typically referred to as septic cardiomyopathy. Among various theories postulated
for the etiology of septic cardiomyopathy, mitochondrial injury (both morphology and function) in the heart
is perceived as the main culprit for reduced myocardial performance and ultimately heart failure in the face of
sepsis.
Methods:
Over the past decades, ample of experimental and clinical work have appeared, focusing on myocardial
mitochondrial changes and related interventions in septic cardiomyopathy.
Results and Conclusion:
Here we will briefly summarize the recent experimental and clinical progress on myocardial
mitochondrial morphology and function in sepsis, and discuss possible underlying mechanisms, as well as
the contemporary interventional options.
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Affiliation(s)
- Ying Tan
- Department of Emergency Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Sainan Chen
- Department of Emergency Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Jiankai Zhong
- Department of Cardiology, Shunde Hospital, Southern Medical University, Foshan, 528300, Guangdong, China
| | - Jun Ren
- Department of Cardiology, Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital Fudan University, Shanghai, 200032, China
| | - Maolong Dong
- Department of Emergency Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
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29
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Yin X, Xin H, Mao S, Wu G, Guo L. The Role of Autophagy in Sepsis: Protection and Injury to Organs. Front Physiol 2019; 10:1071. [PMID: 31507440 PMCID: PMC6716215 DOI: 10.3389/fphys.2019.01071] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Accepted: 08/05/2019] [Indexed: 12/12/2022] Open
Abstract
Sepsis is a systemic inflammatory disease with infection, and autophagy has been shown to play an important role in sepsis. This review summarizes the main regulatory mechanisms of autophagy in sepsis and its latest research. Recent studies have shown that autophagy can regulate innate immune processes and acquired immune processes, and the regulation of autophagy in different immune cells is different. Mitophagy can select damaged mitochondria and remove it to deal with oxidative stress damage. The process of mitophagy is regulated by other factors. Non-coding RNA is also an important factor in the regulation of autophagy. In addition, more and more studies in recent years have shown that autophagy plays different roles in different organs. It tends to be protective in the lungs, heart, kidneys, and brain, and tends to be damaging in skeletal muscle. We also mentioned that some drugs can regulate autophagy. The process of modulating autophagy through drug intervention appears to be a new potential hope for the treatment of sepsis.
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Affiliation(s)
- Xin Yin
- Department of Critical Care Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Huang Xin
- Department of Critical Care Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Shuai Mao
- Department of Critical Care Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Guangping Wu
- Department of Critical Care Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Liheng Guo
- Department of Critical Care Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou, China
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30
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Lautz AJ, Zingarelli B. Age-Dependent Myocardial Dysfunction in Critically Ill Patients: Role of Mitochondrial Dysfunction. Int J Mol Sci 2019; 20:ijms20143523. [PMID: 31323783 PMCID: PMC6679204 DOI: 10.3390/ijms20143523] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 07/11/2019] [Accepted: 07/16/2019] [Indexed: 02/06/2023] Open
Abstract
Myocardial dysfunction is common in septic shock and post-cardiac arrest but manifests differently in pediatric and adult patients. By conventional echocardiographic parameters, biventricular systolic dysfunction is more prevalent in children with septic shock, though strain imaging reveals that myocardial injury may be more common in adults than previously thought. In contrast, diastolic dysfunction in general and post-arrest myocardial systolic dysfunction appear to be more widespread in the adult population. A growing body of evidence suggests that mitochondrial dysfunction mediates myocardial depression in critical illness; alterations in mitochondrial electron transport system function, bioenergetic production, oxidative and nitrosative stress, uncoupling, mitochondrial permeability transition, fusion, fission, biogenesis, and autophagy all may play key pathophysiologic roles. In this review we summarize the epidemiologic and clinical phenotypes of myocardial dysfunction in septic shock and post-cardiac arrest and the multifaceted manifestations of mitochondrial injury in these disease processes. Since neonatal and pediatric-specific data for mitochondrial dysfunction remain sparse, conclusive age-dependent differences are not clear; instead, we highlight what evidence exists and identify gaps in knowledge to guide future research. Finally, since focal ischemic injury (with or without reperfusion) leading to myocardial infarction is predominantly an atherosclerotic disease of the elderly, this review focuses specifically on septic shock and global ischemia-reperfusion injury occurring after resuscitation from cardiac arrest.
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Affiliation(s)
- Andrew J Lautz
- Division of Critical Care Medicine, Cincinnati Children's Hospital Medical Center, and Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Basilia Zingarelli
- Division of Critical Care Medicine, Cincinnati Children's Hospital Medical Center, and Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH 45229, USA.
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31
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Inhibitory effect of melatonin on Mst1 ameliorates myocarditis through attenuating ER stress and mitochondrial dysfunction. J Mol Histol 2019; 50:405-415. [PMID: 31256303 DOI: 10.1007/s10735-019-09836-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 06/20/2019] [Indexed: 12/27/2022]
Abstract
Viral myocarditis has been found to be one of the leading causes of sudden death in young adults. However, no effective drugs have been developed to intervene the progression of myocarditis. Accordingly, the present study is carried out to explore the protective role played by melatonin in the setting of viral myocarditis with a focus on Mst1-Hippo pathway, mitochondrial dysfunction and ER stress. Cardiac function was determined via echocardiographic examination. Mitochondrial function and ER stress were detected via ELISA, western blots, and immunofluorescence. Our data demonstrated that virus injection induced cardiac dysfunction as evidenced by reduced contractile function in myocardium. Besides, LDH release assay and western blotting analysis demonstrated that cardiomyocyte death was activated by virus injection. Interestingly, melatonin treatment improved cardiac function and repressed virus-mediated cardiomyocyte apoptosis. At the molecular levels, mitochondrial dysfunction was induced by virus infection, as indicated by mitochondrial membrane potential reduction, mPTP opening rate elevation and caspase-9-related apoptosis activation. Besides, ER stress parameters were also elevated in virus-treated cardiomyocytes. Interestingly, melatonin treatment maintained mitochondrial dysfunction and repressed ER stress. To the end, we found that Mst1 was upregulated by virus infection; this effect was attenuated through supplementation with melatonin. However, Mst1 overexpression reduced the beneficial impact exerted by melatonin on cardiomyocyte viability, mitochondrial function and ER homeostasis. Our study illustrated that melatonin treatment attenuated viral myocarditis via sustaining cardiomyocyte viability, repressing mitochondrial dysfunction and inhibiting ER stress in a manner dependent on Mst1 inhibition.
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Guillon A, Preau S, Aboab J, Azabou E, Jung B, Silva S, Textoris J, Uhel F, Vodovar D, Zafrani L, de Prost N, Radermacher P. Preclinical septic shock research: why we need an animal ICU. Ann Intensive Care 2019; 9:66. [PMID: 31183570 PMCID: PMC6557957 DOI: 10.1186/s13613-019-0543-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 06/03/2019] [Indexed: 12/14/2022] Open
Abstract
Animal experiments are widely used in preclinical medical research with the goal of disease modeling and exploration of novel therapeutic approaches. In the context of sepsis and septic shock, the translation into clinical practice has been disappointing. Classical animal models of septic shock usually involve one-sex-one-age animal models, mostly in mice or rats, contrasting with the heterogeneous population of septic shock patients. Many other factors limit the reliability of preclinical models and may contribute to preclinical research failure in critical care, including the host specificity of several pathogens, the fact that laboratory animals are raised in pathogen-free facilities and that organ support techniques are either absent or minimal. Advanced animal models have been developed with the aim of improving the clinical translatability of experimental findings. So-called animal ICUs refer to the preclinical investigation of adult or even aged animals of either sex, using—in case of rats and mice—miniaturized equipment allowing for reproducing an ICU environment at a small animal scale and integrating chronic comorbidities to more closely reflect the clinical conditions studied. Strength and limitations of preclinical animal models designed to decipher the mechanisms involved in septic cardiomyopathy are discussed. This article reviews the current status and the challenges of setting up an animal ICU.
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Affiliation(s)
- Antoine Guillon
- Service de Médecine Intensive - Réanimation, CHRU de Tours, Tours, France.,Centre d'Etude des Pathologies Respiratoires (CEPR), UMR 1100, INSERM, Faculté de Médecine, Université de Tours, Tours, France
| | - Sebastien Preau
- Service de Médecine Intensive, Hôpital Salengro, CHU Lille, Lille, France.,Lille Inflammation Research International Center (LIRIC), U 995, School of Medicine, INSERM, Univ. Lille, Lille, France
| | - Jérôme Aboab
- Service de Réanimation, Hôpital Delafontaine, Saint-Denis, France
| | - Eric Azabou
- Service de Réanimation, Assistance Publique-Hôpitaux de Paris, Hôpital Raymond Poincaré, 92380, Garches, France
| | - Boris Jung
- Service de Réanimation, CHU de Montpellier, Montpellier, France
| | - Stein Silva
- Service de Réanimation, CHU Purpan, 31300, Toulouse, France
| | - Julien Textoris
- Département d'Anesthésie-Réanimation, hôpital Édouard-Herriot, Hospices Civils de Lyon, CHU de Lyon, 69437, Lyon, France.,EA 7426 Pathophysiology of Injury-induced Immunosuppression, University of Lyon1-Hospices Civils de Lyon - bioMérieux, Hôpital Edouard Herriot, 69437, Lyon, France
| | - Fabrice Uhel
- Service de Réanimation Médicale et Maladies Infectieuses, CHU de Rennes, Hôpital Pontchaillou, Rennes, France
| | - Dominique Vodovar
- Centre Antipoison et de Toxicovigilance de Paris - Fédération de Toxicologie, Hôpital Fernand-Widal, Assistance Publique-Hôpitaux de Paris, Paris, France.,UMRS 1144, Faculté de Pharmacie, INSERM, Paris, France
| | - Lara Zafrani
- Service de Réanimation Médicale, Assistance Publique-Hôpitaux de Paris, Hôpital Saint-Louis, Paris, France
| | - Nicolas de Prost
- Service de Réanimation Médicale, Hôpital Henri Mondor, Assistance Publique-Hôpitaux de Paris, 51, Avenue du Maréchal de Lattre de Tassigny, 94010, Créteil Cedex, France.
| | - Peter Radermacher
- Institut für Anästhesiologische Pathophysiologie und Verfahrensentwicklung, Universitätsklinikum, Ulm, Germany
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Chao H, Lin C, Zuo Q, Liu Y, Xiao M, Xu X, Li Z, Bao Z, Chen H, You Y, Kochanek PM, Yin H, Liu N, Kagan VE, Bayır H, Ji J. Cardiolipin-Dependent Mitophagy Guides Outcome after Traumatic Brain Injury. J Neurosci 2019; 39:1930-1943. [PMID: 30626699 PMCID: PMC6407296 DOI: 10.1523/jneurosci.3415-17.2018] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 11/21/2018] [Accepted: 12/28/2018] [Indexed: 01/14/2023] Open
Abstract
Mitochondrial energy production is essential for normal brain function. Traumatic brain injury (TBI) increases brain energy demands, results in the activation of mitochondrial respiration, associated with enhanced generation of reactive oxygen species. This chain of events triggers neuronal apoptosis via oxidation of a mitochondria-specific phospholipid, cardiolipin (CL). One pathway through which cells can avoid apoptosis is via elimination of damaged mitochondria by mitophagy. Previously, we showed that externalization of CL to the mitochondrial surface acts as an elimination signal in cells. Whether CL-mediated mitophagy occurs in vivo or its significance in the disease processes are not known. In this study, we showed that TBI leads to increased mitophagy in the human brain, which was also detected using TBI models in male rats. Knockdown of CL synthase, responsible for de novo synthesis of CL, or phospholipid scramblase-3, responsible for CL translocation to the outer mitochondrial membrane, significantly decreased TBI-induced mitophagy. Inhibition of mitochondrial clearance by 3-methyladenine, mdivi-1, or phospholipid scramblase-3 knockdown after TBI led to a worse outcome, suggesting that mitophagy is beneficial. Together, our findings indicate that TBI-induced mitophagy is an endogenous neuroprotective process that is directed by CL, which marks damaged mitochondria for elimination, thereby limiting neuronal death and behavioral deficits.SIGNIFICANCE STATEMENT Traumatic brain injury (TBI) increases energy demands leading to activation of mitochondrial respiration associated with enhanced generation of reactive oxygen species and resultant damage to mitochondria. We demonstrate that the complete elimination of irreparably damaged organelles via mitophagy is activated as an early response to TBI. This response includes translocation of mitochondria phospholipid cardiolipin from the inner membrane to the outer membrane where externalized cardiolipin mediates targeted protein light chain 3-mediated autophagy of damaged mitochondria. Our data on targeting phospholipid scramblase and cardiolipin synthase in genetically manipulated cells and animals strongly support the essential role of cardiolipin externalization mechanisms in the endogenous reparative plasticity of injured brain cells. Furthermore, successful execution and completion of mitophagy is beneficial in the context of preservation of cognitive functions after TBI.
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Affiliation(s)
- Honglu Chao
- Departments of Neurosurgery and
- Center for Free Radical and Antioxidant Health, Department of Environmental and Occupational Health
- Safar Center for Resuscitation Research, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15219
| | | | - Qiang Zuo
- Orthopedics, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
| | | | - Mengqing Xiao
- Key Laboratory of Food Safety Research, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences (CAS), Shanghai 200031, China
- University of the Chinese Academy of Sciences, CAS, Beijing 100049, China
- School of Life Science and Technology, Shanghai Tech University, Shanghai 201210, China
| | | | | | | | - Huimei Chen
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing 210093, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing 210029, China
| | | | - Patrick M Kochanek
- Safar Center for Resuscitation Research, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15219
| | - Huiyong Yin
- Key Laboratory of Food Safety Research, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences (CAS), Shanghai 200031, China
- University of the Chinese Academy of Sciences, CAS, Beijing 100049, China
- School of Life Science and Technology, Shanghai Tech University, Shanghai 201210, China
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, Beijing 100022, China
| | | | - Valerian E Kagan
- Center for Free Radical and Antioxidant Health, Department of Environmental and Occupational Health
- Laboratory of Navigational Redox Lipidomics and Department of Human Pathology, IM Sechenov Moscow State Medical University, Moscow 119991, Russian Federation, and
| | - Hülya Bayır
- Center for Free Radical and Antioxidant Health, Department of Environmental and Occupational Health,
- Safar Center for Resuscitation Research, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15219
- Children's Neuroscience Institute, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania 15224
| | - Jing Ji
- Departments of Neurosurgery and
- Center for Free Radical and Antioxidant Health, Department of Environmental and Occupational Health
- Safar Center for Resuscitation Research, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15219
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Abstract
The role of autophagy in subarachnoid hemorrhage (SAH) remains unclear. This study aimed to investigate the role of ROCK2 in the regulation of hippocampus autophagy after SAH. Thirty-six Sprague-Dawley rats were randomly divided into three groups - the sham group, the SAH group, and the SAH+ ROCK2 inhibitor group (or the drug group) - and analyzed through a behavior test. The hippocampus tissues were analyzed using immunochemistry and western blot analysis. We observed injured morphology in the hippocampus and impaired learning and memory ability in the rats in the SAH group, accompanied by upregulated ROCK2 expression and increased beclin-1 and LC3-II expression. Compared with the SAH group, we observed normal morphology in the hippocampus and better learning and memory ability in the rats in the drug group, accompanied by downregulated ROCK2 expression and increased beclin-1 and LC3-II expression. SAH activates autophagy in the hippocampus, but this could be inhibited by ROCK2. Inhibition of ROCK2 promotes autophagy and reduces the injury in the hippocampus, leading to the recovery of learning and memory ability following SAH. ROCK2 may represent a new target for the treatment of SAH.
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The role of mitochondria in sepsis-induced cardiomyopathy. Biochim Biophys Acta Mol Basis Dis 2018; 1865:759-773. [PMID: 30342158 DOI: 10.1016/j.bbadis.2018.10.011] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 10/02/2018] [Accepted: 10/05/2018] [Indexed: 02/08/2023]
Abstract
Sepsis is defined as a life-threatening organ dysfunction caused by a dysregulated host response to infection. Myocardial dysfunction, often termed sepsis-induced cardiomyopathy, is a frequent complication and is associated with worse outcomes. Numerous mechanisms contribute to sepsis-induced cardiomyopathy and a growing body of evidence suggests that bioenergetic and metabolic derangements play a central role in its development; however, there are significant discrepancies in the literature, perhaps reflecting variability in the experimental models employed or in the host response to sepsis. The condition is characterised by lack of significant cell death, normal tissue oxygen levels and, in survivors, reversibility of organ dysfunction. The functional changes observed in cardiac tissue may represent an adaptive response to prolonged stress that limits cell death, improving the potential for recovery. In this review, we describe our current understanding of the pathophysiology underlying myocardial dysfunction in sepsis, with a focus on disrupted mitochondrial processes.
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Wang Y, Wang X, Liu W, Zhang L. Role of the Rho/ROCK signaling pathway in the protective effects of fasudil against acute lung injury in septic rats. Mol Med Rep 2018; 18:4486-4498. [PMID: 30221694 PMCID: PMC6172402 DOI: 10.3892/mmr.2018.9446] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 08/13/2018] [Indexed: 01/13/2023] Open
Abstract
Fasudil, which is primarily prescribed to treat cerebral vasospasm, may also inhibit systemic inflammation and prevent sepsis-induced acute lung injury (ALI) in rats, although the mechanisms remain elusive. The purpose of the present study was to investigate the role of the rhodopsin (Rho)/Rho-associated protein kinase (ROCK) signaling pathway in the protective effects of fasudil on ALI in septic rats. A total of 60 Wistar rats were pretreated with fasudil (30 mg/kg) through intraperitoneal injections 1 h prior to cecal ligation and puncture. Administration of fasudil led to reductions in polymorphonuclear neutrophil counts, and the protein concentrations of tumor necrosis factor-α, interleukin (IL)-1β and IL-6 in the bronchoalveolar lavage fluid of rats with sepsis-induced ALI. The results demonstrated that fasudil decreased sepsis-induced bacteremia. In addition, fasudil effectively reduced the Evans blue content, wet/dry lung weight ratio, lung injury score, and expression levels of malondialdehyde and myeloperoxidase. However, the superoxide dismutase activity in the lung tissue of the rats was increased. Activated caspase-3 activity in lung tissue was reduced to 29% by fasudil. Furthermore, the expression of Rho and ROCK1 was significantly downregulated, and the phosphorylation of myosin phosphatase-targeting subunit 1 in lung tissues was markedly decreased, whereas the protein expression levels of zonula occludens 1 were increased in fasudil-treated rats (P<0.05). In the in vitro experiments, vascular endothelial growth factor, intracellular adhesion molecule 1 and vascular cell adhesion molecule 1 secreted from human pulmonary microvascular endothelial cells treated with lipopolysaccharide (LPS) were attenuated by fasudil. Fasudil also reduced the fluorescence intensity of filamentous actin induced by LPS. Taken together, the results of the present study demonstrated that fasudil was able to improve endothelial permeability and inhibit inflammation, oxidative stress and cellular apoptosis in order to alleviate ALI in septic rats through inhibition of the Rho/ROCK signaling pathway.
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Affiliation(s)
- Yu Wang
- Emergency Department, Shengjing Hospital Affiliated to China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Xiaofeng Wang
- Emergency Department, Shengjing Hospital Affiliated to China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Wei Liu
- Emergency Department, Shengjing Hospital Affiliated to China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Lichun Zhang
- Emergency Department, Shengjing Hospital Affiliated to China Medical University, Shenyang, Liaoning 110004, P.R. China
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Gen WR, Fu CY, He HH, Zheng MZ, Wang LL, Yang Y, Shen YL, Chen YY. Linagliptin improved myocardial function recovery in rat hearts after a prolonged hypothermic preservation. Life Sci 2018; 210:47-54. [PMID: 30170072 DOI: 10.1016/j.lfs.2018.08.062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 08/17/2018] [Accepted: 08/26/2018] [Indexed: 11/18/2022]
Abstract
AIMS To determine whether linagliptin, a dipeptidyl peptidase 4 inhibitor, can promote the recovery of cardiac function after hypothermic preservation. MAIN METHODS Rat hearts were preserved in cold Celsior solution with or without linagliptin for 9 h. Cardiac function was evaluated at 60 min of reperfusion after hypothermic preservation. Cardiac mitochondrial morphology was observed using transmission electron microscope. The expression of dynamin-related protein 1 (Drp1), NADPH oxidase 2 (NOX2), calmodulin-dependent protein kinase II (CaMKII) were detected using Western blot. KEY FINDINGS Compared with Celsior group, supplement of Celsior solution with linagliptin (0.25-0.75 nM) could significantly prevent hypothermic preservation-induced cardiac dysfunction. The expression of NOX2 protein, ROS level and MDA content in cardium were increased after hypothermic preservation, which was inhibited by linagliptin. Although the mitofusin1, 2, optic atrophy type 1, and total Drp1 expression in myocardium did not change, the level of p-Drp1 S616 and mitochondrial Drp1 were enhanced after hypothermic preservation. Linagliptin supplement could inhibit the hypothermic preservation-induced increase in p-Drp1 S616 and mitochondrial Drp1 protein, and mitigate the mitochondrial fragmentation. Level of p-CaMKII protein enhanced after hypothermic preservation, which could be prevented by linagliptin or a NOX2 inhibitor Phox-I2. Both Phox-I2 and a CaMKII inhibitor KN-93 could reduce the hypothermic preservation-induced increase in p-Drp1 S616 and mitochondrial Drp1 protein. SIGNIFICANCE Supplement Celsior solution with linagliptin could improve cardiac function recovery in 9-h hypothermic preserved rat hearts. The cardioprotective effect of linagliptin might be due to the inhibition of Drp1 phosphorylation and mitochondrial translocation by preventing NOX2-mediated CaMKII activation.
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Affiliation(s)
- Wei-Ran Gen
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Chun-Yan Fu
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Hui-Hui He
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Ming-Zhi Zheng
- Department of Pharmacology, Hangzhou Medical College, Hangzhou 310053, China
| | - Lin-Lin Wang
- Center for Stem Cell and Tissue Engineering, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Yi Yang
- Department of Pharmacology, Medical School of Jinhua Polytechnic, Jinhua 321007, China
| | - Yue-Liang Shen
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou 310058, China.
| | - Ying-Ying Chen
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou 310058, China.
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Phosphatidylinositol 3-kinase-mediated HO-1/CO represses Fis1 levels and alleviates lipopolysaccharide-induced oxidative injury in alveolar macrophages. Exp Ther Med 2018; 16:2735-2742. [PMID: 30210614 DOI: 10.3892/etm.2018.6448] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Accepted: 05/17/2018] [Indexed: 12/14/2022] Open
Abstract
Sepsis-related acute respiratory distress syndrome is characterized by marked oxidative stress and mitochondrial dysfunction lacking of specific therapy. Heme oxygenase (HO)-1 followed by endogenous carbon monoxide (CO) exerted a cytoprotective effect against multi-organ damage during sepsis. Additionally, the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt) pathway, which serves as an upstream regulator of HO-1, was associated with inflammation and oxidative stress. Therefore, the purpose of the present study was to investigate whether the PI3K/Akt pathway was involved in the effects of HO-1/CO on the expression of mitochondrial fission 1 protein (Fis1). In the present study, CO releasing molecule-2 (CORM2), as the exogenous source of CO, plus LY294002, as a specific PI3K inhibitor, were pre-incubated in lipopolysaccharide (LPS)-simulated rat NR8383 alveolar macrophages. The results demonstrated that CORM2 improved cell viability, inhibited tumor necrosis factor-α levels, malondialdehyde contents, while elevating interleukin-10 levels and superoxide dismutase activities. In addition, pretreatment with CORM2 suppressed the fragmentation of mitochondria, upregulated the expressions of phosphorylated-Akt and HO-1 but downregulated the levels of Fis1 mRNA and protein in LPS-exposed cells. However, pretreatment with LY294002 significantly inhibited the phosphorylation of Akt, decreased HO-1 levels, aggravated mitochondrial fragmentation, increased Fis1 mRNA and protein levels, and reversed the above protective effects of CORM2. Collectively, the results of the present study indicated that the PI3K/Akt pathway mediated the cytoprotective effects of HO-1/CO on the transcription and translational levels of Fis1, and alleviated LPS-induced oxidative injury in alveolar macrophages.
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Brand CS, Tan VP, Brown JH, Miyamoto S. RhoA regulates Drp1 mediated mitochondrial fission through ROCK to protect cardiomyocytes. Cell Signal 2018; 50:48-57. [PMID: 29953931 DOI: 10.1016/j.cellsig.2018.06.012] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 06/22/2018] [Accepted: 06/24/2018] [Indexed: 12/12/2022]
Abstract
Cardiac ischemia/reperfusion, loss of blood flow and its subsequent restoration, causes damage to the heart. Oxidative stress from ischemia/reperfusion leads to dysfunction and death of cardiomyocytes, increasing the risk of progression to heart failure. Alterations in mitochondrial dynamics, in particular mitochondrial fission, have been suggested to play a role in cardioprotection from oxidative stress. We tested the hypothesis that activation of RhoA regulates mitochondrial fission in cardiomyocytes. Our studies show that expression of constitutively active RhoA in cardiomyocytes increases phosphorylation of Dynamin-related protein 1 (Drp1) at serine-616, and leads to localization of Drp1 at mitochondria. Both responses are blocked by inhibition of Rho-associated Protein Kinase (ROCK). Endogenous RhoA activation by the GPCR agonist sphingosine-1-phosphate (S1P) also increases Drp1 phosphorylation and its mitochondrial translocation in a RhoA and ROCK dependent manner. Consistent with the role of mitochondrial Drp1 in fission, RhoA activation in cardiomyocytes leads to formation of smaller mitochondria and this is attenuated by inhibition of ROCK, by siRNA knockdown of Drp1 or by expression of a phosphorylation-deficient Drp1 S616A mutant. In addition, activation of RhoA prevents cell death in cardiomyocytes challenged by oxidative stress and this protection is blocked by siRNA knockdown of Drp1 or by Drp1 S616A expression. Taken together our findings demonstrate that RhoA activation can regulate Drp1 to induce mitochondrial fission and subsequent cellular protection, implicating regulation of fission as a novel mechanism contributing to RhoA-mediated cardioprotection.
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Affiliation(s)
- Cameron S Brand
- Department of Pharmacology, School of Medicine, University of California - San Diego, La Jolla, CA 92093, United States
| | - Valerie P Tan
- Department of Pharmacology, School of Medicine, University of California - San Diego, La Jolla, CA 92093, United States
| | - Joan Heller Brown
- Department of Pharmacology, School of Medicine, University of California - San Diego, La Jolla, CA 92093, United States.
| | - Shigeki Miyamoto
- Department of Pharmacology, School of Medicine, University of California - San Diego, La Jolla, CA 92093, United States.
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40
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Zhou H, Wang S, Zhu P, Hu S, Chen Y, Ren J. Empagliflozin rescues diabetic myocardial microvascular injury via AMPK-mediated inhibition of mitochondrial fission. Redox Biol 2018; 15:335-346. [PMID: 29306791 PMCID: PMC5756062 DOI: 10.1016/j.redox.2017.12.019] [Citation(s) in RCA: 355] [Impact Index Per Article: 59.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 12/28/2017] [Accepted: 12/29/2017] [Indexed: 02/08/2023] Open
Abstract
Impaired cardiac microvascular function contributes to diabetic cardiovascular complications although effective therapy remains elusive. Empagliflozin, a sodium-glucose cotransporter 2 (SGLT2) inhibitor recently approved for treatment of type 2 diabetes, promotes glycosuria excretion and offers cardioprotective actions beyond its glucose-lowering effects. This study was designed to evaluate the effect of empagliflozin on cardiac microvascular injury in diabetes and the underlying mechanism involved with a focus on mitochondria. Our data revealed that empagliflozin improved diabetic myocardial structure and function, preserved cardiac microvascular barrier function and integrity, sustained eNOS phosphorylation and endothelium-dependent relaxation, as well as improved microvessel density and perfusion. Further study suggested that empagliflozin exerted its effects through inhibition of mitochondrial fission in an adenosine monophosphate (AMP)-activated protein kinase (AMPK)-dependent manner. Empagliflozin restored AMP-to-ATP ratio to trigger AMPK activation, suppressed Drp1S616 phosphorylation, and increased Drp1S637 phosphorylation, ultimately leading to inhibition of mitochondrial fission. The empagliflozin-induced inhibition of mitochondrial fission preserved cardiac microvascular endothelial cell (CMEC) barrier function through suppressed mitochondrial reactive oxygen species (mtROS) production and subsequently oxidative stress to impede CMEC senescence. Empagliflozin-induced fission loss also favored angiogenesis by promoting CMEC migration through amelioration of F-actin depolymerization. Taken together, these results indicated the therapeutic promises of empagliflozin in the treatment of pathological microvascular changes in diabetes.
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Affiliation(s)
- Hao Zhou
- Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing 100853, China.
| | - Shuyi Wang
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA
| | - Pingjun Zhu
- Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing 100853, China
| | - Shunying Hu
- Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing 100853, China
| | - Yundai Chen
- Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing 100853, China.
| | - Jun Ren
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA; Department of Cardiology, Fudan University Zhongshan Hospital, Shanghai 210032, China.
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41
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Pan P, Wang X, Liu D. The potential mechanism of mitochondrial dysfunction in septic cardiomyopathy. J Int Med Res 2018; 46:2157-2169. [PMID: 29637807 PMCID: PMC6023059 DOI: 10.1177/0300060518765896] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Septic cardiomyopathy is one of the most serious complications of sepsis or septic shock. Basic and clinical research has studied the mechanism of cardiac dysfunction for more than five decades. It has become clear that myocardial depression is not related to hypoperfusion. As the heart is highly dependent on abundant adenosine triphosphate (ATP) levels to maintain its contraction and diastolic function, impaired mitochondrial function is lethally detrimental to the heart. Research has shown that mitochondria play an important role in organ damage during sepsis. The mitochondria-related mechanisms in septic cardiomyopathy have been discussed in terms of restoring mitochondrial function. Mitochondrial uncoupling proteins located in the mitochondrial inner membrane can promote proton leakage across the mitochondrial inner membrane. Recent studies have demonstrated that proton leakage is the essential regulator of mitochondrial membrane potential and the generation of reactive oxygen species (ROS) and ATP. Other mechanisms involved in septic cardiomyopathy include mitochondrial ROS production and oxidative stress, mitochondria Ca2+ handling, mitochondrial DNA in sepsis, mitochondrial fission and fusion, mitochondrial biogenesis, mitochondrial gene regulation and mitochondria autophagy. This review will provide an overview of recent insights into the factors contributing to septic cardiomyopathy.
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Affiliation(s)
- Pan Pan
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
| | - Xiaoting Wang
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
| | - Dawei Liu
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
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42
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Qi J, Wang F, Yang P, Wang X, Xu R, Chen J, Yuan Y, Lu Z, Duan J. Mitochondrial Fission Is Required for Angiotensin II-Induced Cardiomyocyte Apoptosis Mediated by a Sirt1-p53 Signaling Pathway. Front Pharmacol 2018; 9:176. [PMID: 29593530 PMCID: PMC5854948 DOI: 10.3389/fphar.2018.00176] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2017] [Accepted: 02/16/2018] [Indexed: 01/06/2023] Open
Abstract
Hypertension-induced cardiac apoptosis is a major contributor to early-stage heart-failure. Our previous studies have found that p53-mediated mitochondrial fission is involved in aldosterone-induced podocyte apoptosis. However, it is not clear that whether p53-induced mitochondrial fission is critical for hypertensive Angiotensin II (AngII)-induced cardiomyocyte apoptosis. In this study, we found that inhibition of the mitochondrial fission protein Drp1 (dynamin-related protein 1) by Mdivi-1 prevented cardiomyocyte apoptosis and cardiac remodeling in SHRs. In vitro we found that treatment of cultured neonatal rat cardiomyocytes with AngII induced Drp1 expression, mitochondrial fission, and apoptosis. Knockdown of Drp1 inhibited AngII-induced mitochondrial fission and cardiomyocyte apoptosis. Furthermore, AngII induced p53 acetylation. Knockdown of p53 inhibited AngII-induced Drp1 expression, mitochondrial fission, and cardiomyocyte apoptosis. Besides, we found that Sirt1 was able to reverse AngII-induced p53 acetylation and its binding to the Drp1 promoter, which subsequently inhibited mitochondrial fission and eventually attenuated cardiomyocyte apoptosis. Collectively, these results suggest that AngII degrades Sirt1 to increase p53 acetylation, which induces Drp1 expression and eventually results in cardiomyocyte apoptosis. Sirt1/p53/Drp1dependent mitochondrial fission may be a valuable therapeutic target for hypertension induced heart failure.
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Affiliation(s)
- Jia Qi
- Department of Pharmacy, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China.,Department of Gerontology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Feng Wang
- Department of Neurology, Shanghai General Hospital, Shanghai Jiaotong University, Shanghai, China
| | - Ping Yang
- Department of Pharmacy, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Xuelian Wang
- Department of Gerontology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Renjie Xu
- Department of Pharmacy, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Jihui Chen
- Department of Pharmacy, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Yanggang Yuan
- Department of Nephrology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Zhaoyang Lu
- Department of Pharmacy, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China.,Department of Gerontology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Junli Duan
- Department of Gerontology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
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Shen YL, Shi YZ, Chen GG, Wang LL, Zheng MZ, Jin HF, Chen YY. TNF-α induces Drp1-mediated mitochondrial fragmentation during inflammatory cardiomyocyte injury. Int J Mol Med 2018; 41:2317-2327. [PMID: 29336470 DOI: 10.3892/ijmm.2018.3385] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 01/09/2018] [Indexed: 11/06/2022] Open
Abstract
Dynamin-related peptide 1 (Drpl)-mediated mitochondrial fission is an important process associated with cardiac dysfunction under different pathological conditions. The aim of the present study was to investigate the expression of Drpl during inflammatory myocardial injury. Sprague‑Dawley rats were treated intraperitoneally with lipopolysaccharides (LPS). Furthermore, cultured H9C2 cardiomyocytes were treated with LPS, interleukin‑6 (IL‑6) and tumor necrosis factor‑α (TNF‑α). Total and mitochondrial proteins were isolated from the heart tissue of rats and from the H9C2 cardiomyocytes. Expression levels of Drp1 and RhoA were analyzed by western blotting. Mitochondrial morphology was determined using confocal laser microscopy. The levels of mitochondrial Drp1 and phosphorylated‑Drp1 (p‑Drp1) Ser616 were revealed to be increased in rats 6 h after injection with LPS (5, 10 or 20 mg/kg). Furthermore, treatment with LPS and IL‑6 did not demonstrate a significant effect on the expression of total and mitochondrial Drp1 in H9C2 cardiomyocytes in vitro; however, treatment with TNF‑α (20 ng/ml) significantly enhanced the levels of mitochondrial Drp1 and p‑Drp1 Ser616. Following TNF‑α treatment, the expression of Ras homolog gene family member A (RhoA) was also revealed to increase. Treatment with both Y‑27632 and fasudil, [Rho kinase (ROCK) inhibitors], was demonstrated to attenuate the otherwise TNF‑α‑induced increase in p‑Drp1 Ser616 and mitochondrial Drp1. In addition, it was revealed that Y‑27632 and fasudil may also attenuate the TNF‑α‑induced increase in mitochondrial fragmentation and cell viability. Therefore, the findings of the present study suggest that TNF‑α is the predominant inducer of Drp1 S616 phosphorylation during sepsis. The results of the present study also suggest that the RhoA/ROCK pathway may be involved in the phosphorylation and mitochondrial translocation of Drp1, which leads to mitochondrial fragmentation.
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Affiliation(s)
- Yue-Liang Shen
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
| | - Ying-Zhou Shi
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
| | - Gai-Ge Chen
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
| | - Lin-Lin Wang
- Center for Stem Cell and Tissue Engineering, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
| | - Ming-Zhi Zheng
- Department of Pharmacology, Hangzhou Medical College, Hangzhou, Zhejiang 310053, P.R. China
| | - Hong-Feng Jin
- Department of Cardiology, Zhejiang Hospital, Hangzhou, Zhejiang 310013, P.R. China
| | - Ying-Ying Chen
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
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Mitochondrial fission and mitophagy depend on cofilin-mediated actin depolymerization activity at the mitochondrial fission site. Oncogene 2018; 37:1485-1502. [PMID: 29321664 DOI: 10.1038/s41388-017-0064-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 11/09/2017] [Accepted: 11/12/2017] [Indexed: 01/03/2023]
Abstract
Mitochondria fission and mitophagy are fundamentally crucial to cellular physiology and play important roles in cancer progression. Developing a comprehensive understanding of the molecular mechanism underlying mitochondrial fission and mitophagy will provide novel strategies for cancer prevention and treatment. Actin has been shown to participate in mitochondrial fission and mitophagy regulation. Cofilin is best known as an actin-depolymerizing factor. However, the molecular mechanism by which cofilin regulates mitochondrial fission and mitophagy remains largely unknown. Here we report that knockdown of cofilin attenuates and overexpression of cofilin potentiates mitochondrial fission as well as PINK1/PARK2-dependent mitophagy induced by staurosporine (STS), etoposide (ETO), and carbonyl cyanide 3-chlorophenylhydrazone (CCCP). Cofilin-mediated-PINK1 (PTEN-induced putative kinase 1) accumulation mainly depends on its regulation of mitochondrial proteases, including peptidase mitochondrial processing beta (MPPβ), presenilin-associated rhomboid-like protease (PARL), and ATPase family gene 3-like 2 (AFG3L2), via mitochondrial membrane potential activity. We also found that the interaction and colocalization of G-actin/F-actin with cofilin at mitochondrial fission sites undergo constriction after CCCP treatment. Pretreatment with the actin polymerization inhibitor latrunculin B (LatB) increased and actin-depolymerization inhibitor jasplakinolide (Jas) decreased mitochondrial translocation of actin induced by STS, ETO, and CCCP. Both LatB and Jas abrogated CCCP-mediated mitochondrial fission and mitophagy. Our data suggest that G-actin is the actin form that is translocated to mitochondria, and the actin-depolymerization activity regulated by cofilin at the mitochondrial fission site is crucial for inducing mitochondrial fission and mitophagy.
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Involvement of Mitochondrial Disorders in Septic Cardiomyopathy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:4076348. [PMID: 29201271 PMCID: PMC5671744 DOI: 10.1155/2017/4076348] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 09/11/2017] [Accepted: 09/28/2017] [Indexed: 12/29/2022]
Abstract
Sepsis is defined as a life-threatening organ dysfunction caused by a dysregulated host response to infection. It remains a leading cause of death worldwide, despite the development of various therapeutic strategies. Cardiac dysfunction, also referred to as septic cardiomyopathy, is a frequent and well-described complication of sepsis and associated with worse clinical outcomes. Recent research has increased our understanding of the role of mitochondrial dysfunction in the pathophysiology of septic cardiomyopathy. The purpose of this review is to present this evidence as a coherent whole and to highlight future research directions.
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Sepsis-Induced Cardiomyopathy: Oxidative Implications in the Initiation and Resolution of the Damage. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:7393525. [PMID: 29057035 PMCID: PMC5625757 DOI: 10.1155/2017/7393525] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 07/14/2017] [Accepted: 08/23/2017] [Indexed: 12/13/2022]
Abstract
Cardiac dysfunction may complicate the course of severe sepsis and septic shock with significant implications for patient's survival. The basic pathophysiologic mechanisms leading to septic cardiomyopathy have not been fully clarified until now. Disease-specific treatment is lacking, and care is still based on supportive modalities. Septic state causes destruction of redox balance in many cell types, cardiomyocytes included. The production of reactive oxygen and nitrogen species is increased, and natural antioxidant systems fail to counterbalance the overwhelming generation of free radicals. Reactive species interfere with many basic cell functions, mainly through destruction of protein, lipid, and nucleic acid integrity, compromising enzyme function, mitochondrial structure and performance, and intracellular signaling, all leading to cardiac contractile failure. Takotsubo cardiomyopathy may result from oxidative imbalance. This review will address the multiple aspects of cardiomyocyte bioenergetic failure in sepsis and discuss potential therapeutic interventions.
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Zhang J, Zhao P, Quan N, Wang L, Chen X, Cates C, Rousselle T, Li J. The endotoxemia cardiac dysfunction is attenuated by AMPK/mTOR signaling pathway regulating autophagy. Biochem Biophys Res Commun 2017; 492:520-527. [PMID: 28807827 DOI: 10.1016/j.bbrc.2017.08.034] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 08/10/2017] [Indexed: 12/11/2022]
Abstract
AMP-activated protein kinase (AMPK), an enzyme that plays a role in cellular energy homeostasis, modulates myocardial signaling in the heart. Myocardial dysfunction is a common complication of sepsis. Autophagy is involved in the aging related cardiac dysfunction. However, the role of AMPK in sepsis-induced cardiotoxicity has yet to be clarified, especially in aging. In this study, we explored the role of AMPK in lipopolysaccharide (LPS)-induced myocardial dysfunction and elucidated the potential mechanisms of AMPK/mTOR pathway regulating autophagy in young and aged mice. We harvested cardiac tissues by intraperitoneal injection of LPS treatment. The results by echocardiography, pathology, contractile and intracellular Ca2+ property as well as western blot analysis revealed that LPS induced remarkable cardiac dysfunction and cardiotoxicity in mice hearts and cardiomyocytes, which were more seriously in the aged mice. Western blot analysis indicated that the underlying mechanisms included inhibition autophagy mediated by AMPK/mTOR activation. LPS overtly promoted the expression of AMPK upstream regulator PP2A and PP2Cα. Pharmacological activation of AMPK improved cardiac function and upregulated cardiac autophagy induced by LPS in the aged mice. Collectively, our findings suggest that upregulation of autophagy by administration of AMPK could attenuate LPS-induced cardiotoxicity, which enhances our knowledge to explore new drugs and strategies for combating cardiac dysfunction induced by sepsis.
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Affiliation(s)
- Jie Zhang
- Department of Nutrition, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
| | - Peng Zhao
- Department of Cardiology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Nanhu Quan
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
| | - Lin Wang
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
| | - Xu Chen
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
| | - Courtney Cates
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
| | - Thomas Rousselle
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
| | - Ji Li
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA.
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El Zowalaty AE, Li R, Zheng Y, Lydon JP, DeMayo FJ, Ye X. Deletion of RhoA in Progesterone Receptor-Expressing Cells Leads to Luteal Insufficiency and Infertility in Female Mice. Endocrinology 2017; 158:2168-2178. [PMID: 28498971 PMCID: PMC5505209 DOI: 10.1210/en.2016-1796] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 05/08/2017] [Indexed: 12/22/2022]
Abstract
Ras homolog gene family, member A (RhoA) is widely expressed throughout the female reproductive system. To assess its role in progesterone receptor-expressing cells, we generated RhoA conditional knockout mice RhoAd/d (RhoAf/f-Pgr-Cre+/-). RhoAd/d female mice had comparable mating activity, serum luteinizing hormone, prolactin, and estradiol levels and ovulation with control but were infertile with progesterone insufficiency, indicating impaired steroidogenesis in RhoAd/d corpus luteum (CL). RhoA was highly expressed in wild-type luteal cells and conditionally deleted in RhoAd/d CL. Gestation day 3.5 (D3.5) RhoAd/d ovaries had reduced numbers of CL, less defined corpus luteal cord formation, and disorganized CL collagen IV staining. RhoAd/d CL had lipid droplet and free cholesterol accumulation, indicating the availability of cholesterol for steroidogenesis, but disorganized β-actin and vimentin staining, indicating disrupted cytoskeleton integrity. Cytoskeleton is important for cytoplasmic cholesterol movement to mitochondria and for regulating mitochondria. Dramatically reduced expression of mitochondrial markers heat shock protein 60 (HSP60), voltage-dependent anion channel, and StAR was detected in RhoAd/d CL. StAR carries out the rate-limiting step of steroidogenesis. StAR messenger RNA expression was reduced in RU486-treated D3.5 wild-type CL and tended to be induced in progesterone-treated D3.5 RhoAd/d CL, with parallel changes of HSP60 expression. These data demonstrated the in vivo function of RhoA in CL luteal cell cytoskeleton integrity, cholesterol transport, StAR expression, and progesterone synthesis, and a positive feedback on StAR expression in CL by progesterone signaling. These findings provide insights into mechanisms of progesterone insufficiency.
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Affiliation(s)
- Ahmed E. El Zowalaty
- Department of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602
- Interdisciplinary Toxicology Program, University of Georgia, Athens, Georgia 30602
| | - Rong Li
- Department of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602
- Interdisciplinary Toxicology Program, University of Georgia, Athens, Georgia 30602
| | - Yi Zheng
- Division of Experimental Hematology and Cancer Biology, Children’s Hospital Research Foundation, Cincinnati, Ohio 45229
| | - John P. Lydon
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030
| | - Francesco J. DeMayo
- Reproductive and Developmental Biology Laboratory/Pregnancy and Female Reproduction Group, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709
| | - Xiaoqin Ye
- Department of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602
- Interdisciplinary Toxicology Program, University of Georgia, Athens, Georgia 30602
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Schnoor M, García Ponce A, Vadillo E, Pelayo R, Rossaint J, Zarbock A. Actin dynamics in the regulation of endothelial barrier functions and neutrophil recruitment during endotoxemia and sepsis. Cell Mol Life Sci 2017; 74:1985-1997. [PMID: 28154894 PMCID: PMC11107778 DOI: 10.1007/s00018-016-2449-x] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 12/19/2016] [Accepted: 12/21/2016] [Indexed: 01/20/2023]
Abstract
Sepsis is a leading cause of death worldwide. Increased vascular permeability is a major hallmark of sepsis. Dynamic alterations in actin fiber formation play an important role in the regulation of endothelial barrier functions and thus vascular permeability. Endothelial integrity requires a delicate balance between the formation of cortical actin filaments that maintain endothelial cell contact stability and the formation of actin stress fibers that generate pulling forces, and thus compromise endothelial cell contact stability. Current research has revealed multiple molecular pathways that regulate actin dynamics and endothelial barrier dysfunction during sepsis. These include intracellular signaling proteins of the small GTPases family (e.g., Rap1, RhoA and Rac1) as well as the molecules that are directly acting on the actomyosin cytoskeleton such as myosin light chain kinase and Rho kinases. Another hallmark of sepsis is an excessive recruitment of neutrophils that also involves changes in the actin cytoskeleton in both endothelial cells and neutrophils. This review focuses on the available evidence about molecules that control actin dynamics and regulate endothelial barrier functions and neutrophil recruitment. We also discuss treatment strategies using pharmaceutical enzyme inhibitors to target excessive vascular permeability and leukocyte recruitment in septic patients.
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Affiliation(s)
- Michael Schnoor
- Department for Molecular Biomedicine, Centre for Investigation and Advanced Studies of the National Polytechnic Institute (Cinvestav-IPN), Av. IPN 2508, San Pedro Zacatenco, GAM, 07360, Mexico City, Mexico.
| | - Alexander García Ponce
- Department for Molecular Biomedicine, Centre for Investigation and Advanced Studies of the National Polytechnic Institute (Cinvestav-IPN), Av. IPN 2508, San Pedro Zacatenco, GAM, 07360, Mexico City, Mexico
| | - Eduardo Vadillo
- Department for Molecular Biomedicine, Centre for Investigation and Advanced Studies of the National Polytechnic Institute (Cinvestav-IPN), Av. IPN 2508, San Pedro Zacatenco, GAM, 07360, Mexico City, Mexico
| | - Rosana Pelayo
- Oncology Research Unit, National Medical Center, Mexican Institute for Social Security, 06720, Mexico City, Mexico
| | - Jan Rossaint
- Department of Anaesthesiology, Critical Care and Pain Medicine, University Hospital Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany
| | - Alexander Zarbock
- Department of Anaesthesiology, Critical Care and Pain Medicine, University Hospital Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany.
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50
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Tzanavari T, Varela A, Theocharis S, Ninou E, Kapelouzou A, Cokkinos DV, Kontaridis MI, Karalis KP. Metformin protects against infection-induced myocardial dysfunction. Metabolism 2016; 65:1447-58. [PMID: 27621180 PMCID: PMC5456263 DOI: 10.1016/j.metabol.2016.06.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 06/23/2016] [Accepted: 06/29/2016] [Indexed: 01/13/2023]
Abstract
BACKGROUND AND PURPOSE Metformin administration is associated with myocardial protection during ischemia and/or reperfusion, possibly via inhibition of inflammatory responses in the heart. Exposure to pathogens, in addition to the activation of the immune system and the associated metabolic dysfunction, often results in compromised myocardial function. We examined whether metformin administration could maintain the normal myocardial function in experimental moderate Gram negative infection, induced by lipopolysaccharide (LPS) administration. EXPERIMENTAL APPROACH 129xC57BL/6 mice were divided into control groups that received either vehicle or a single intraperitoneal (i.p.) injection of low dose LPS (5mg/kg body wt), and metformin treated groups that received either daily metformin (4mg/kg/animal) i.p. injections for five days prior to LPS administration [Experiment 1], or a single metformin injection following same dose of LPS [Experiment 2]. KEY RESULTS LPS alone caused cardiac dysfunction, as confirmed by echocardiography, whereas metformin administration, either before or after LPS, rescued myocardial function. LPS caused marked reduction of the cardiac metabolism-related genes tested, including Prkaa2, Cpt1b, Ppargc1a and Ppargc1b; reduction of fatty acid oxidation, as reflected by the regulation of Ppara, Acaca and Acacb; increased glucose transport, as shown by Slc2a4 levels; reduction of ATP synthesis; significant increase of inflammatory markers, in particular IL6; and reduction of autophagy. Pretreatment with metformin normalized the levels of all these factors. CONCLUSIONS AND IMPLICATIONS We show for the first time that metformin protects the myocardium from LPS-associated myocardial dysfunction mainly by supporting its metabolic activity and allowing efficient energy utilization. Metformin can be a potential cardioprotective agent in individuals susceptible to exposure to pathogens.
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Affiliation(s)
- Theodora Tzanavari
- Center for Clinical, Experimental Surgery and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens 11527, Greece.
| | - Aimilia Varela
- Center for Clinical, Experimental Surgery and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens 11527, Greece
| | - Stamatis Theocharis
- First Department of Pathology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Elpinickie Ninou
- Centre for Basic Research, Biomedical Research Foundation of the Academy of Athens, Athens 11527, Greece
| | - Alkistis Kapelouzou
- Center for Clinical, Experimental Surgery and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens 11527, Greece
| | - Dennis V Cokkinos
- Center for Clinical, Experimental Surgery and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens 11527, Greece; First Department of Cardiology, Onassis Cardiac Surgery Center, Athens, Greece
| | - Maria I Kontaridis
- Department of Medicine, Division of Cardiology, Beth Israel Deaconess Medical Center and Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA
| | - Katia P Karalis
- Center for Clinical, Experimental Surgery and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens 11527, Greece; Endocrine Division, Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.
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