1
|
Liang G, Hu JY, Liu RJ, Chao YP, Hu YF, Zheng H, Pan XY, Li YJ, Gong YH, Lin C, Lin JH, Wang JD, Li TX, Pan JP, Guo DY. α-Ketoglutarate plays an inflammatory inhibitory role by regulating scavenger receptor class a expression through N6-methyladenine methylation during sepsis. Eur J Immunol 2024:e2350655. [PMID: 38973083 DOI: 10.1002/eji.202350655] [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: 07/09/2023] [Revised: 06/13/2024] [Accepted: 06/17/2024] [Indexed: 07/09/2024]
Abstract
Sepsis arises from an uncontrolled inflammatory response triggered by infection or stress, accompanied by alteration in cellular energy metabolism, and a strong correlation exists between these factors. Alpha-ketoglutarate (α-KG), an intermediate product of the TCA cycle, has the potential to modulate the inflammatory response and is considered a crucial link between energy metabolism and inflammation. The scavenger receptor (SR-A5), a significant pattern recognition receptor, assumes a vital function in anti-inflammatory reactions. In the current investigation, we have successfully illustrated the ability of α-KG to mitigate inflammatory factors in the serum of septic mice and ameliorate tissue damage. Additionally, α-KG has been shown to modulate metabolic reprogramming and macrophage polarization. Moreover, our findings indicate that the regulatory influence of α-KG on sepsis is mediated through SR-A5. We also elucidated the mechanism by which α-KG regulates SR-A5 expression and found that α-KG reduced the N6-methyladenosine level of macrophages by up-regulating the m6A demethylase ALKBH5. α-KG plays a crucial role in inhibiting inflammation by regulating SR-A5 expression through m6A demethylation during sepsis. The outcomes of this research provide valuable insights into the relationship between energy metabolism and inflammation regulation, as well as the underlying molecular regulatory mechanism.
Collapse
Affiliation(s)
- Gang Liang
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
- Zhejiang University school of medicine, Hangzhou, P. R. China
| | - Jia-Yan Hu
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Rou-Jun Liu
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Yu-Peng Chao
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Yi-Fan Hu
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Hong Zheng
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Xin-Yu Pan
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Yuan-Jing Li
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Yang-Hui Gong
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Chi Lin
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Jia-Hao Lin
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Jia-Dong Wang
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Tong-Xin Li
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
| | - Jian-Ping Pan
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
- Institute of Translational Medicine, Hangzhou City University, Hangzhou, P.R. China
| | - Dong-Yang Guo
- Department of Clinical Medicine, Hangzhou City University School of Medicine, Hangzhou, P.R. China
- Institute of Translational Medicine, Hangzhou City University, Hangzhou, P.R. China
| |
Collapse
|
2
|
Sahoo DK, Wong D, Patani A, Paital B, Yadav VK, Patel A, Jergens AE. Exploring the role of antioxidants in sepsis-associated oxidative stress: a comprehensive review. Front Cell Infect Microbiol 2024; 14:1348713. [PMID: 38510969 PMCID: PMC10952105 DOI: 10.3389/fcimb.2024.1348713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Accepted: 02/15/2024] [Indexed: 03/22/2024] Open
Abstract
Sepsis is a potentially fatal condition characterized by organ dysfunction caused by an imbalanced immune response to infection. Although an increased inflammatory response significantly contributes to the pathogenesis of sepsis, several molecular mechanisms underlying the progression of sepsis are associated with increased cellular reactive oxygen species (ROS) generation and exhausted antioxidant pathways. This review article provides a comprehensive overview of the involvement of ROS in the pathophysiology of sepsis and the potential application of antioxidants with antimicrobial properties as an adjunct to primary therapies (fluid and antibiotic therapies) against sepsis. This article delves into the advantages and disadvantages associated with the utilization of antioxidants in the therapeutic approach to sepsis, which has been explored in a variety of animal models and clinical trials. While the application of antioxidants has been suggested as a potential therapy to suppress the immune response in cases where an intensified inflammatory reaction occurs, the use of multiple antioxidant agents can be beneficial as they can act additively or synergistically on different pathways, thereby enhancing the antioxidant defense. Furthermore, the utilization of immunoadjuvant therapy, specifically in septic patients displaying immunosuppressive tendencies, represents a promising advancement in sepsis therapy.
Collapse
Affiliation(s)
- Dipak Kumar Sahoo
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| | - David Wong
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| | - Anil Patani
- Department of Biotechnology, Smt. S. S. Patel Nootan Science and Commerce College, Sankalchand Patel University, Gujarat, India
| | - Biswaranjan Paital
- Redox Regulation Laboratory, Department of Zoology, College of Basic Science and Humanities, Odisha University of Agriculture and Technology, Bhubaneswar, India
| | - Virendra Kumar Yadav
- Department of Life Sciences, Hemchandracharya North Gujarat University, Gujarat, India
| | - Ashish Patel
- Department of Life Sciences, Hemchandracharya North Gujarat University, Gujarat, India
| | - Albert E. Jergens
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| |
Collapse
|
3
|
Liu AB, Li SJ, Yu YY, Zhang JF, Ma L. Current insight on the mechanisms of programmed cell death in sepsis-induced myocardial dysfunction. Front Cell Dev Biol 2023; 11:1309719. [PMID: 38161332 PMCID: PMC10754983 DOI: 10.3389/fcell.2023.1309719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Accepted: 12/04/2023] [Indexed: 01/03/2024] Open
Abstract
Sepsis is a clinical syndrome characterized by a dysregulated host response to infection, leading to life-threatening organ dysfunction. It is a high-fatality condition associated with a complex interplay of immune and inflammatory responses that can cause severe harm to vital organs. Sepsis-induced myocardial injury (SIMI), as a severe complication of sepsis, significantly affects the prognosis of septic patients and shortens their survival time. For the sake of better administrating hospitalized patients with sepsis, it is necessary to understand the specific mechanisms of SIMI. To date, multiple studies have shown that programmed cell death (PCD) may play an essential role in myocardial injury in sepsis, offering new strategies and insights for the therapeutic aspects of SIMI. This review aims to elucidate the role of cardiomyocyte's programmed death in the pathophysiological mechanisms of SIMI, with a particular focus on the classical pathways, key molecules, and signaling transduction of PCD. It will explore the role of the cross-interaction between different patterns of PCD in SIMI, providing a new theoretical basis for multi-target treatments for SIMI.
Collapse
Affiliation(s)
- An-Bu Liu
- Department of Emergency Medical, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, China
| | - Shu-Jing Li
- Department of Pediatrics Medical, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, China
| | - Yuan-Yuan Yu
- Department of Emergency Medical, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, China
| | - Jun-Fei Zhang
- Department of Emergency Medical, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, China
| | - Lei Ma
- Department of Emergency Medical, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, China
| |
Collapse
|
4
|
Yusuff H, Chawla S, Sato R, Dugar S, Bangash MN, Antonini MV, Shelley B, Valchanov K, Roscoe A, Scott J, Akhtar W, Rosenberg A, Dimarakis I, Khorsandi M, Zochios V. Mechanisms of Acute Right Ventricular Injury in Cardiothoracic Surgical and Critical Care Settings: Part 2. J Cardiothorac Vasc Anesth 2023; 37:2318-2326. [PMID: 37625918 DOI: 10.1053/j.jvca.2023.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 07/05/2023] [Accepted: 07/17/2023] [Indexed: 08/27/2023]
Abstract
The right ventricle (RV) is intricately linked in the clinical presentation of critical illness; however, the basis of this is not well-understood and has not been studied as extensively as the left ventricle. There has been an increased awareness of the need to understand how the RV is affected in different critical illness states. In addition, the increased use of point-of-care echocardiography in the critical care setting has allowed for earlier identification and monitoring of the RV in a patient who is critically ill. The first part of this review describes and characterizes the RV in different perioperative states. This second part of the review discusses and analyzes the complex pathophysiologic relationships between the RV and different critical care states. There is a lack of a universal RV injury definition because it represents a range of abnormal RV biomechanics and phenotypes. The term "RV injury" (RVI) has been used to describe a spectrum of presentations, which includes diastolic dysfunction (early injury), when the RV retains the ability to compensate, to RV failure (late or advanced injury). Understanding the mechanisms leading to functional 'uncoupling' between the RV and the pulmonary circulation may enable perioperative physicians, intensivists, and researchers to identify clinical phenotypes of RVI. This, consequently, may provide the opportunity to test RV-centric hypotheses and potentially individualize therapies.
Collapse
Affiliation(s)
- Hakeem Yusuff
- Department of Cardiothoracic Critical Care Medicine and ECMO Unit, Glenfield Hospital, University Hospitals of Leicester NHS Trust, Leicester, United Kingdom; Department of Respiratory Sciences, University of Leicester, Leicester, United Kingdom.
| | - Sanchit Chawla
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, OH
| | - Ryota Sato
- Division of Critical Care Medicine, Department of Medicine, The Queen's Medical Center, Honolulu, HI
| | - Siddharth Dugar
- Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, OH; Cleveland Clinic Lerner College of Medicine, Case Western University Reserve University, Cleveland, OH
| | - Mansoor N Bangash
- Liver Intensive Care Unit, Queen Elizabeth Hospital Birmingham, Mindelsohn Way, Birmingham, United Kingdom; Birmingham Liver Failure Research Group, Institute of Inflammation and Ageing, College of Medical and Dental sciences, University of Birmingham, Birmingham, United Kingdom; Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, College of Medical and Dental sciences, University of Birmingham, Birmingham, United Kingdom
| | - Marta Velia Antonini
- Anesthesia and Intensive Care Unit, Bufalini Hospital, AUSL della Romagna, Cesena, Italy; Department of Biomedical, Metabolic and Neural Sciences, University of Modena & Reggio Emilia, Modena, Italy
| | - Benjamin Shelley
- Department of Cardiothoracic Anesthesia and Intensive Care, Golden Jubilee National Hospital, Clydebank, United Kingdom; Anesthesia, Perioperative Medicine and Critical Care research group, University of Glasgow, Glasgow, United Kingdom
| | - Kamen Valchanov
- Department of Anesthesia and Perioperative Medicine, Singapore General Hospital, Outram Road, Singapore
| | - Andrew Roscoe
- Department of Anesthesia and Perioperative Medicine, Singapore General Hospital, Outram Road, Singapore; Department of Anesthesiology, Singapore General Hospital, National Heart Centre Singapore, Singapore
| | - Jeffrey Scott
- Jackson Health System / Miami Transplant Institute, Miami, FL
| | - Waqas Akhtar
- Royal Brompton and Harefield Hospitals, Part of Guys and St. Thomas's National Health System Foundation Trust, London, United Kingdom
| | - Alex Rosenberg
- Royal Brompton and Harefield Hospitals, Part of Guys and St. Thomas's National Health System Foundation Trust, London, United Kingdom
| | - Ioannis Dimarakis
- Division of Cardiothoracic Surgery, University of Washington Medical Center, Seattle, WA
| | - Maziar Khorsandi
- Division of Cardiothoracic Surgery, University of Washington Medical Center, Seattle, WA
| | - Vasileios Zochios
- Department of Cardiothoracic Critical Care Medicine and ECMO Unit, Glenfield Hospital, University Hospitals of Leicester NHS Trust, Leicester, United Kingdom; Department of Cardiovascular Sciences, University of Leicester, Leicester, United Kingdom
| |
Collapse
|
5
|
Fan Y, Guan B, Xu J, Zhang H, Yi L, Yang Z. Role of toll-like receptor-mediated pyroptosis in sepsis-induced cardiomyopathy. Biomed Pharmacother 2023; 167:115493. [PMID: 37734261 DOI: 10.1016/j.biopha.2023.115493] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 09/08/2023] [Accepted: 09/12/2023] [Indexed: 09/23/2023] Open
Abstract
Sepsis, a life-threatening dysregulated status of the host response to infection, can cause multiorgan dysfunction and mortality. Sepsis places a heavy burden on the cardiovascular system due to the pathological imbalance of hyperinflammation and immune suppression. Myocardial injury and cardiac dysfunction caused by the aberrant host responses to pathogens can lead to cardiomyopathy, one of the most critical complications of sepsis. However, many questions about the specific mechanisms and characteristics of this complication remain to be answered. The causes of sepsis-induced cardiac dysfunction include abnormal cardiac perfusion, myocardial inhibitory substances, autonomic dysfunction, mitochondrial dysfunction, and calcium homeostasis dysregulation. The fight between the host and pathogens acts as the trigger for sepsis-induced cardiomyopathy. Pyroptosis, a form of programmed cell death, plays a critical role in the progress of sepsis. Toll-like receptors (TLRs) act as pattern recognition receptors and participate in innate immune pathways that recognize damage-associated molecular patterns as well as pathogen-associated molecular patterns to mediate pyroptosis. Notably, pyroptosis is tightly associated with cardiac dysfunction in sepsis and septic shock. In line with these observations, induction of TLR-mediated pyroptosis may be a promising therapeutic approach to treat sepsis-induced cardiomyopathy. This review focuses on the potential roles of TLR-mediated pyroptosis in sepsis-induced cardiomyopathy, to shed light on this promising therapeutic approach, thus helping to prevent and control septic shock caused by cardiovascular disorders and improve the prognosis of sepsis patients.
Collapse
Affiliation(s)
- Yixuan Fan
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China; Intensive Care Unit, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Baoyi Guan
- Department of Internal Medicine-Cardiovascular, The First Affiliated Hospital of Guangzhou University of Chinese Medicine
| | - Jianxing Xu
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China; Intensive Care Unit, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - He Zhang
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China; National Clinical Research Center for Chinese Medicine Cardiology, Beijing, China
| | - Liang Yi
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China; Intensive Care Unit, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China.
| | - Zhixu Yang
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China; Intensive Care Unit, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China.
| |
Collapse
|
6
|
Yin L, Tang Y, Lin X, Jiang B. Progress in the mechanism of mitochondrial dysfunction in septic cardiomyopathy. ALL LIFE 2022. [DOI: 10.1080/26895293.2022.2156622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Affiliation(s)
- Leijing Yin
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, Changsha, Hunan, People’s Republic of China
- Sepsis Translational Medicine Key Lab of Hunan Province, Hunan, People’s Republic of China
- National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan, People’s Republic of China
| | - Yuting Tang
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, Changsha, Hunan, People’s Republic of China
- Sepsis Translational Medicine Key Lab of Hunan Province, Hunan, People’s Republic of China
- National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan, People’s Republic of China
| | - Xiaofang Lin
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, Changsha, Hunan, People’s Republic of China
- Sepsis Translational Medicine Key Lab of Hunan Province, Hunan, People’s Republic of China
- National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan, People’s Republic of China
| | - Bimei Jiang
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, Changsha, Hunan, People’s Republic of China
- Sepsis Translational Medicine Key Lab of Hunan Province, Hunan, People’s Republic of China
- National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan, People’s Republic of China
| |
Collapse
|
7
|
Hanaford A, Johnson SC. The immune system as a driver of mitochondrial disease pathogenesis: a review of evidence. Orphanet J Rare Dis 2022; 17:335. [PMID: 36056365 PMCID: PMC9438277 DOI: 10.1186/s13023-022-02495-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Accepted: 08/15/2022] [Indexed: 12/04/2022] Open
Abstract
Background Genetic mitochondrial diseases represent a significant challenge to human health. These diseases are extraordinarily heterogeneous in clinical presentation and genetic origin, and often involve multi-system disease with severe progressive symptoms. Mitochondrial diseases represent the most common cause of inherited metabolic disorders and one of the most common causes of inherited neurologic diseases, yet no proven therapeutic strategies yet exist. The basic cell and molecular mechanisms underlying the pathogenesis of mitochondrial diseases have not been resolved, hampering efforts to develop therapeutic agents. Main body In recent pre-clinical work, we have shown that pharmacologic agents targeting the immune system can prevent disease in the Ndufs4(KO) model of Leigh syndrome, indicating that the immune system plays a causal role in the pathogenesis of at least this form of mitochondrial disease. Intriguingly, a number of case reports have indicated that immune-targeting therapeutics may be beneficial in the setting of genetic mitochondrial disease. Here, we summarize clinical and pre-clinical evidence suggesting a key role for the immune system in mediating the pathogenesis of at least some forms of genetic mitochondrial disease. Conclusions Significant clinical and pre-clinical evidence indicates a key role for the immune system as a significant in the pathogenesis of at least some forms of genetic mitochondrial disease.
Collapse
Affiliation(s)
- Allison Hanaford
- Center for Integrative Brain Research, Seattle Children's Research Institute, 1900 9th Ave., JMB-925, Seattle, WA, 98101, USA
| | - Simon C Johnson
- Center for Integrative Brain Research, Seattle Children's Research Institute, 1900 9th Ave., JMB-925, Seattle, WA, 98101, USA. .,Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, USA. .,Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA, USA. .,Department of Neurology, University of Washington, Seattle, WA, USA.
| |
Collapse
|
8
|
Lai Y, Lin C, Lin X, Wu L, Zhao Y, Shao T, Lin F. Comprehensive Analysis of Molecular Subtypes and Hub Genes of Sepsis by Gene Expression Profiles. Front Genet 2022; 13:884762. [PMID: 36035194 PMCID: PMC9412106 DOI: 10.3389/fgene.2022.884762] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Accepted: 06/10/2022] [Indexed: 11/15/2022] Open
Abstract
Background: Sepsis is a systemic inflammatory response syndrome (SIRS) with heterogeneity of clinical symptoms. Studies further exploring the molecular subtypes of sepsis and elucidating its probable mechanisms are urgently needed. Methods: Microarray datasets of peripheral blood in sepsis were downloaded from the Gene Expression Omnibus (GEO) database, and differentially expressed genes (DEGs) were identified. Weighted gene co-expression network analysis (WGCNA) analysis was conducted to screen key module genes. Consensus clustering analysis was carried out to identify distinct sepsis molecular subtypes. Subtype-specific pathways were explored using gene set variation analysis (GSVA). Afterward, we intersected subtype-related, dramatically expressed and module-specific genes to screen consensus DEGs (co-DEGs). Enrichment analysis was carried out to identify key pathways. The least absolute shrinkage and selection operator (LASSO) regression analysis was used for screen potential diagnostic biomarkers. Results: Patients with sepsis were classified into three clusters. GSVA showed these DEGs among different clusters in sepsis were assigned to metabolism, oxidative phosphorylation, autophagy regulation, and VEGF pathways, etc. In addition, we identified 40 co-DEGs and several dysregulated pathways. A diagnostic model with 25-gene signature was proven to be of high value for the diagnosis of sepsis. Genes in the diagnostic model with AUC values more than 0.95 in external datasets were screened as key genes for the diagnosis of sepsis. Finally, ANKRD22, GPR84, GYG1, BLOC1S1, CARD11, NOG, and LRG1 were recognized as critical genes associated with sepsis molecular subtypes. Conclusion: There are remarkable differences in and enriched pathways among different molecular subgroups of sepsis, which may be the key factors leading to heterogeneity of clinical symptoms and prognosis in patients with sepsis. Our current study provides novel diagnostic and therapeutic biomarkers for sepsis molecular subtypes.
Collapse
Affiliation(s)
- Yongxing Lai
- Department of Geriatric Medicine, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Fujian Provincial Center for Geriatrics, Fujian Provincial Hospital, Fuzhou, China
| | - Chunjin Lin
- Department of Geriatric Medicine, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Fujian Provincial Center for Geriatrics, Fujian Provincial Hospital, Fuzhou, China
| | - Xing Lin
- Department of Geriatric Medicine, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Fujian Provincial Center for Geriatrics, Fujian Provincial Hospital, Fuzhou, China
| | - Lijuan Wu
- Department of Geriatric Medicine, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Fujian Provincial Center for Geriatrics, Fujian Provincial Hospital, Fuzhou, China
| | - Yinan Zhao
- Department of Geriatric Medicine, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Fujian Provincial Center for Geriatrics, Fujian Provincial Hospital, Fuzhou, China
| | - Tingfang Shao
- Department of Geriatric Medicine, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Fujian Provincial Center for Geriatrics, Fujian Provincial Hospital, Fuzhou, China
| | - Fan Lin
- Department of Geriatric Medicine, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Fujian Provincial Center for Geriatrics, Fujian Provincial Hospital, Fuzhou, China
- *Correspondence: Fan Lin,
| |
Collapse
|
9
|
Brusletto BS, Hellerud BC, Olstad OK, Øvstebø R, Brandtzaeg P. Transcriptomic changes in the large organs in lethal meningococcal shock are reflected in a porcine shock model. Front Cell Infect Microbiol 2022; 12:908204. [PMID: 36034711 PMCID: PMC9413276 DOI: 10.3389/fcimb.2022.908204] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 07/06/2022] [Indexed: 11/26/2022] Open
Abstract
Background Fulminant meningococcal sepsis with shock and multiple organ failure is associated with a massive systemic inflammatory response involving solid organs. We have previously established a porcine model of the disease to study pathophysiologic and possible therapeutic strategies. Objective This study examined whether the organ specific gene expression profile in such a large animal model reflects the profile seen in patients with fulminant meningococcal sepsis. Patients and methods Data from gene expression profiles induced in organs from patients (n=5) and the porcine model (n=8) were imported into the Ingenuity pathway analysis (IPA) software for comparison analysis. The number of meningococci in the organs were quantified by real time-PCR. Results The all-over transcriptional activation between different organs revealed a striking concordance between the patients and the pigs regarding the pattern of transcriptional activation and activated pathways. Comparison analysis demonstrated similar pattern of upregulation of genes being associated with a large range of inflammatory biofunctions in the patients and the porcine model. Genes associated with biofunctions such as organismal death, morbidity and mortality were similarly downregulated in the patients and the porcine model. Comparison analysis of main predicted canonical pathways also demonstrated a high degree of similarity regarding up- and downregulation in both groups. Core analysis revealed different top-upstream regulators in the different organs in the patients. In the patients pro-inflammatory regulators were most activated in the lungs. In the other organs up-stream factors that regulate signaling pathways involved in development, growth, repair and homeostasis and triglyceride synthesis were most activated. In the porcine model, the top-upstream regulators were pro-inflammatory in all organs. The difference may reflect the shorter duration of the porcine experiment than the duration of the patient’s infection before death. Conclusion The inflammatory responses measured on the transcriptomic level in organs in patients with fulminant meningococcal sepsis is reproduced in the porcine model of the disease, although some differences may exist regarding the top-upregulated factors in individual organs. Thus, this large animal model reproduces important immunological features of meningococcal sepsis and can be a valuable tool in further investigations of inflammatory aspects and possible treatment options
Collapse
Affiliation(s)
- Berit Sletbakk Brusletto
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
- *Correspondence: Berit Sletbakk Brusletto,
| | | | | | - Reidun Øvstebø
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Petter Brandtzaeg
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
- Department of Pediatrics, Oslo University Hospital, Oslo, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| |
Collapse
|
10
|
Mokhtari B, Yavari R, Badalzadeh R, Mahmoodpoor A. An Overview on Mitochondrial-Based Therapies in Sepsis-Related Myocardial Dysfunction: Mitochondrial Transplantation as a Promising Approach. THE CANADIAN JOURNAL OF INFECTIOUS DISEASES & MEDICAL MICROBIOLOGY = JOURNAL CANADIEN DES MALADIES INFECTIEUSES ET DE LA MICROBIOLOGIE MEDICALE 2022; 2022:3277274. [PMID: 35706715 PMCID: PMC9192296 DOI: 10.1155/2022/3277274] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 05/05/2022] [Indexed: 11/19/2022]
Abstract
Sepsis is defined as a life-threatening organ failure due to dysregulated host response to infection. Despite current advances in our knowledge about sepsis, it is still considered as a major global health challenge. Myocardial dysfunction is a well-defined manifestation of sepsis which is related to worse outcomes in septic patients. Given that the heart is a mitochondria-rich organ and the normal function of mitochondria is essential for successful modulation of septic response, the contribution of mitochondrial damage in sepsis-related myocardial dysfunction has attracted the attention of many scientists. It is widely accepted that mitochondrial damage is involved in sepsis-related myocardial dysfunction; however, effective and potential treatment modalities in clinical setting are still lacking. Mitochondrial-based therapies are potential approaches in sepsis treatment. Although various therapeutic strategies have been used for mitochondrial function improvement, their effects are limited when mitochondria undergo irreversible alterations under septic challenge. Therefore, application of more effective approaches such as mitochondrial transplantation has been suggested. This review highlights the crucial role of mitochondrial damage in sepsis-related myocardial dysfunction, then provides an overview on mitochondrial-based therapies and current approaches to mitochondrial transplantation as a novel strategy, and proposes future directions for more researches in this field.
Collapse
Affiliation(s)
- Behnaz Mokhtari
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Rana Yavari
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Reza Badalzadeh
- Molecular Medicine Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Physiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ata Mahmoodpoor
- Intensive Care Unit, Emam Reza Hospital, Tabriz University of Medical Sciences, Tabriz, Iran
- Evidence-Based Medicine Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| |
Collapse
|
11
|
Shimada BK, Boyman L, Huang W, Zhu J, Yang Y, Chen F, Kane MA, Yadava N, Zou L, Lederer WJ, Polster BM, Chao W. Pyruvate-Driven Oxidative Phosphorylation is Downregulated in Sepsis-Induced Cardiomyopathy: A Study of Mitochondrial Proteome. Shock 2022; 57:553-564. [PMID: 34506367 PMCID: PMC8904652 DOI: 10.1097/shk.0000000000001858] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 07/28/2021] [Accepted: 09/02/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND Sepsis-induced cardiomyopathy (SIC) is a major contributing factor for morbidity and mortality in sepsis. Accumulative evidence has suggested that cardiac mitochondrial oxidative phosphorylation is attenuated in sepsis, but the underlying molecular mechanisms remain incompletely understood. METHODS Adult male mice of 9 to 12 weeks old were subjected to sham or cecal ligation and puncture procedure. Echocardiography in vivo and Langendorff-perfused hearts were used to assess cardiac function 24 h after the procedures. Unbiased proteomics analysis was performed to profile mitochondrial proteins in the hearts of both sham and SIC mice. Seahorse respirator technology was used to evaluate oxygen consumption in purified mitochondria. RESULTS Of the 665 mitochondrial proteins identified in the proteomics assay, 35 were altered in septic mice. The mitochondrial remodeling involved various energy metabolism pathways including subunits of the electron transport chain, fatty acid catabolism, and carbohydrate oxidative metabolism. We also identified a significant increase of pyruvate dehydrogenase (PDH) kinase 4 (PDK4) and inhibition of PDH activity in septic hearts. Furthermore, compared to sham mice, mitochondrial oxygen consumption of septic mice was significantly reduced when pyruvate was provided as a substrate. However, it was unchanged when PDH was bypassed by directly supplying the Complex I substrate NADH, or by using the Complex II substrate succinate, or using Complex IV substrate, or by providing the beta-oxidation substrate palmitoylcarnitine, neither of which require PDH for mitochondrial oxygen consumption. CONCLUSIONS These data demonstrate a broad mitochondrial protein remodeling, PDH inactivation and impaired pyruvate-fueled oxidative phosphorylation during SIC, and provide a molecular framework for further exploration.
Collapse
Affiliation(s)
- Briana K. Shimada
- Translational Research Program, Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, Baltimore, Maryland
| | - Liron Boyman
- The Department of Physiology and Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, Maryland
| | - Weiliang Huang
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, Maryland
| | - Jing Zhu
- Translational Research Program, Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, Baltimore, Maryland
| | - Yang Yang
- Translational Research Program, Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, Baltimore, Maryland
| | - Fengqian Chen
- Translational Research Program, Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, Baltimore, Maryland
| | - Maureen A. Kane
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, Maryland
| | - Nagendra Yadava
- Translational Research Program, Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, Baltimore, Maryland
| | - Lin Zou
- Translational Research Program, Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, Baltimore, Maryland
| | - W. Jonathan Lederer
- The Department of Physiology and Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, Maryland
| | - Brian M. Polster
- Translational Research Program, Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, Baltimore, Maryland
| | - Wei Chao
- Translational Research Program, Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, Baltimore, Maryland
| |
Collapse
|
12
|
Aki T, Unuma K, Uemura K. The Role of Peroxiredoxins in the Regulation of Sepsis. Antioxidants (Basel) 2022; 11:antiox11010126. [PMID: 35052630 PMCID: PMC8773135 DOI: 10.3390/antiox11010126] [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: 12/12/2021] [Revised: 01/05/2022] [Accepted: 01/05/2022] [Indexed: 02/01/2023] Open
Abstract
Oxidative stress, a result of a disturbance in redox homeostasis, is considered to be one of the main aggravating events in the pathogenesis of immune disorders. Peroxiredoxins (Prdxs) are an enzyme family that catalyzes the reduction of peroxides, including hydrogen peroxide, lipid peroxides, and nitrogen peroxides. Although the maintenance of cellular redox homeostasis through Prdxs is essential for surviving in adverse environments, Prdxs also participate in the regulation of cellular signal transduction by modulating the activities of a panel of molecules involved in the signal transduction process. Although Prdxs were discovered as intracellular anti-oxidative enzymes, recent research has revealed that Prdxs also play important roles in the extracellular milieu. Indeed, Prdxs have been shown to have the capacity to activate immune cells through ligation with innate immune receptors such as toll-like receptors (TLRs). In this review, we will summarize the intracellular as well as extracellular roles of Prdxs for and against the pathogenesis of inflammatory disorders including sepsis, hemorrhagic shock, and drug-induced liver injury.
Collapse
|
13
|
Asci H, Ozmen O, Erzurumlu Y, Sofu A, Icten P, Kaynak M. Agomelatine protects heart and aorta against lipopolysaccharide-induced cardiovascular toxicity via inhibition of NF-kβ phosphorylation. Drug Chem Toxicol 2022; 45:133-142. [PMID: 31514555 DOI: 10.1080/01480545.2019.1663209] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 08/07/2019] [Accepted: 08/26/2019] [Indexed: 12/19/2022]
Abstract
The aim of this study was to investigate the possible ameliorating effects of agomelatine (AGO) on lipopolysaccharide (LPS)-induced endothelial and cardiac damage. Twenty-four female Wistar Albino rats divided into 3 groups as follows: Control, LPS and LPS + AGO. Total oxidant status (TOS), total antioxidant status (TAS), nuclear factor kappa beta (NF-kβ)/p65, p-NF-kβ, full caspase-8 (Cas-8) and cleaved cas-8 levels were measured in cardiac tissues and creatine kinase MB (CKMB), aspartate aminotransferase (AST), lactate dehydrogenase (LDH) levels in blood biochemically. In addition; cas-8, sirtuin-1 (SIRT-1), interleukin-4 (IL-4), interleukin-10 (IL-10), haptoglobin measured histopathologically in cardiac and aortic tissues. The levels of CKMB, AST, LDH and TOS were increased and TAS were decreased in the LPS group. In Western blot analyses NF-kβ/p65, p-NF-kβ/p65, full and cleaved cas-8 protein levels increased in cardiac tissues of LPS group. In histopathological and immunohistochemical evaluation of the heart sections; hyperemia, micro-hemorrhages and inflammatory cell infiltrations, increase of cas-8, haptoglobin, IL-4 and IL-10 and decrease of SIRT-1 levels were observed in cardiac and endothelial tissues of LPS groups. AGO treatment reversed all these parameters. It was shown that LPS-induced inflammation, oxidative stress and apoptosis via increasing of NF-kβ/p65 signaling, decreasing of SIRT-1 levels and increase of cas-8 levels in heart and endothelial tissues respectively. AGO corrected all these parameters by its antioxidant, antiinflammatory and antiapoptotic activities.
Collapse
Affiliation(s)
- H Asci
- Department of Pharmacology, Faculty of Medicine/Medicine, Medical Device and Dermocosmetic Research and Application Laboratory (IDAL), Suleyman Demirel University, Isparta, Turkey
| | - O Ozmen
- Department of Pathology, Faculty of Veterinary Medicine, Mehmet Akif Ersoy University, Burdur, Turkey
| | - Y Erzurumlu
- Department of Biochemistry, Faculty of Pharmacy, Suleyman Demirel University, Isparta, Turkey
| | - A Sofu
- Department of Bioengineering, Faculty of Engineering, Suleyman Demirel University, Isparta, Turkey
| | - P Icten
- Department of Pharmacology, Faculty of Medicine/Medicine, Medical Device and Dermocosmetic Research and Application Laboratory (IDAL), Suleyman Demirel University, Isparta, Turkey
| | - M Kaynak
- Department of Pharmacology, Faculty of Medicine/Medicine, Medical Device and Dermocosmetic Research and Application Laboratory (IDAL), Suleyman Demirel University, Isparta, Turkey
| |
Collapse
|
14
|
Jiang X, Cai S, Jin Y, Wu F, He J, Wu X, Tan Y, Wang Y. Irisin Attenuates Oxidative Stress, Mitochondrial Dysfunction, and Apoptosis in the H9C2 Cellular Model of Septic Cardiomyopathy through Augmenting Fundc1-Dependent Mitophagy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:2989974. [PMID: 34457111 PMCID: PMC8390168 DOI: 10.1155/2021/2989974] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 07/25/2021] [Accepted: 08/06/2021] [Indexed: 12/22/2022]
Abstract
In the present study, we used lipopolysaccharide- (LPS-) stimulated H9C2 cardiomyocytes to investigate whether irisin treatment attenuates septic cardiomyopathy via Fundc1-related mitophagy. Fundc1 levels and mitophagy were significantly reduced in LPS-stimulated H9C2 cardiomyocytes but were significantly increased by irisin treatment. Irisin significantly increased ATP production and the activities of mitochondrial complexes I and III in the LPS-stimulated cardiomyocytes. Irisin also improved glucose metabolism and significantly reduced LPS-induced levels of reactive oxygen species by increasing the activities of antioxidant enzymes, glutathione peroxidase (GPX), and superoxide dismutase (SOD), as well as levels of reduced glutathione (GSH). TUNEL assays showed that irisin significantly reduced LPS-stimulated cardiomyocyte apoptosis by suppressing the activation of caspase-3 and caspase-9. However, the beneficial effects of irisin on oxidative stress, mitochondrial metabolism, and viability of LPS-stimulated H9C2 cardiomyocytes were abolished by silencing Fundc1. These results demonstrate that irisin abrogates mitochondrial dysfunction, oxidative stress, and apoptosis through Fundc1-related mitophagy in LPS-stimulated H9C2 cardiomyocytes. This suggests irisin is a potentially useful treatment for septic cardiomyopathy, though further investigations are necessary to confirm our findings.
Collapse
Affiliation(s)
- Xiaoqing Jiang
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Shumin Cai
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Yinghui Jin
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Feng Wu
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Jing He
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Xixuan Wu
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Ying Tan
- Department of Critical Care Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Yu Wang
- Department of Hepatobiliary Surgery, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| |
Collapse
|
15
|
Pravda J. Sepsis: Evidence-based pathogenesis and treatment. World J Crit Care Med 2021; 10:66-80. [PMID: 34316443 PMCID: PMC8291008 DOI: 10.5492/wjccm.v10.i4.66] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 04/13/2021] [Accepted: 06/02/2021] [Indexed: 02/06/2023] Open
Abstract
Sepsis can develop during the body’s response to a critical illness leading to multiple organ failure, irreversible shock, and death. Sepsis has been vexing health care providers for centuries due to its insidious onset, generalized metabolic dysfunction, and lack of specific therapy. A common factor underlying sepsis is the characteristic hypermetabolic response as the body ramps up every physiological system in its fight against the underlying critical illness. A hypermetabolic response requires supraphysiological amounts of energy, which is mostly supplied via oxidative phosphorylation generated ATP. A by-product of oxidative phosphorylation is hydrogen peroxide (H2O2), a toxic, membrane-permeable oxidizing agent that is produced in far greater amounts during a hypermetabolic state. Continued production of mitochondrial H2O2 can overwhelm cellular reductive (antioxidant) capacity leading to a build-up within cells and eventual diffusion into the bloodstream. H2O2 is a metabolic poison that can inhibit enzyme systems leading to organ failure, microangiopathic dysfunction, and irreversible septic shock. The toxic effects of H2O2 mirror the clinical and laboratory abnormalities observed in sepsis, and toxic levels of blood H2O2 have been reported in patients with septic shock. This review provides evidence to support a causal role for H2O2 in the pathogenesis of sepsis, and an evidence-based therapeutic intervention to reduce H2O2 levels in the body and restore redox homeostasis, which is necessary for normal organ function and vascular responsiveness.
Collapse
Affiliation(s)
- Jay Pravda
- Inflammatory Disease Research Centre, Therashock LLC, Palm Beach Gardens, FL 33410, United States
| |
Collapse
|
16
|
Abstract
Sepsis is the life-threatening organ dysfunction caused by a dysregulated host response to infection and is the leading cause of death in intensive care units. Cardiac dysfunction caused by sepsis, usually termed sepsis-induced cardiomyopathy, is common and has long been a subject of interest. In this Review, we explore the definition, epidemiology, diagnosis and pathophysiology of septic cardiomyopathy, with an emphasis on how best to interpret this condition in the clinical context. Advances in diagnostic techniques have increased the sensitivity of detection of myocardial abnormalities but have posed challenges in linking those abnormalities to therapeutic strategies and relevant clinical outcomes. Sophisticated methodologies have elucidated various pathophysiological mechanisms but the extent to which these are adaptive responses is yet to be definitively answered. Although the indications for monitoring and treating septic cardiomyopathy are clinical and directed towards restoring tissue perfusion, a better understanding of the course and implications of septic cardiomyopathy can help to optimize interventions and improve clinical outcomes.
Collapse
|
17
|
Metabolic Alterations in Sepsis. J Clin Med 2021; 10:jcm10112412. [PMID: 34072402 PMCID: PMC8197843 DOI: 10.3390/jcm10112412] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/19/2021] [Accepted: 05/27/2021] [Indexed: 12/20/2022] Open
Abstract
Sepsis is defined as “life-threatening organ dysfunction caused by a dysregulated host response to infection”. Contrary to the older definitions, the current one not only focuses on inflammation, but points to systemic disturbances in homeostasis, including metabolism. Sepsis leads to sepsis-induced dysfunction and mitochondrial damage, which is suggested as a major cause of cell metabolism disorders in these patients. The changes affect the metabolism of all macronutrients. The metabolism of all macronutrients is altered. A characteristic change in carbohydrate metabolism is the intensification of glycolysis, which in combination with the failure of entering pyruvate to the tricarboxylic acid cycle increases the formation of lactate. Sepsis also affects lipid metabolism—lipolysis in adipose tissue is upregulated, which leads to an increase in the level of fatty acids and triglycerides in the blood. At the same time, their use is disturbed, which may result in the accumulation of lipids and their toxic metabolites. Changes in the metabolism of ketone bodies and amino acids have also been described. Metabolic disorders in sepsis are an important area of research, both for their potential role as a target for future therapies (metabolic resuscitation) and for optimizing the current treatment, such as clinical nutrition.
Collapse
|
18
|
Abstract
Objectives: Expound upon priorities for basic/translational science identified in a recent paper by a group of experts assigned by the Society of Critical Care Medicine and the European Society of Intensive Care Medicine. Data Sources: Original paper, search of the literature. Study Selection: By several members of the original task force with specific expertise in basic/translational science. Data Extraction: None. Data Synthesis: None. Conclusions: In the first of a series of follow-up reports to the original paper, several members of the original task force with specific expertise provided a more in-depth analysis of the five identified priorities directly related to basic/translational science. This analysis expounds on what is known about the question and what was identified as priorities for ongoing research. It is hoped that this analysis will aid the development of future research initiatives.
Collapse
|
19
|
Deutschman CS, Hellman J, Roca RF, De Backer D, Coopersmith CM. The surviving sepsis campaign: basic/translational science research priorities. Intensive Care Med Exp 2020; 8:31. [PMID: 32676795 PMCID: PMC7365694 DOI: 10.1186/s40635-020-00312-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Objectives Expound upon priorities for basic/translational science identified in a recent paper by a group of experts assigned by the Society of Critical Care Medicine and the European Society of Intensive Care Medicine. Data sources Original paper, search of the literature. Study selection This study is selected by several members of the original task force with specific expertise in basic/translational science. Data extraction and data synthesis are not available. Conclusions In the first of a series of follow-up reports to the original paper, several members of the original task force with specific expertise provided a more in-depth analysis of the five identified priorities directly related to basic/translational science. This analysis expounds on what is known about the question and what was identified as priorities for ongoing research. It is hoped that this analysis will aid the development of future research initiatives.
Collapse
Affiliation(s)
- Clifford S Deutschman
- Department of Pediatrics, Hofstra/Northwell School of Medicine and the Feinstein Institute for Medical Research/Elmezzi Graduate School of Molecular Medicine, Manhasset, NY, USA. .,Department of Molecular Medicine, Hofstra/Northwell School of Medicine and the Feinstein Institute for Medical Research/Elmezzi Graduate School of Molecular Medicine, Manhasset, NY, USA.
| | - Judith Hellman
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA, USA
| | - Ricard Ferrer Roca
- Intensive Care Department, Vall d'Hebron University Hospital, Barcelona, Spain.,Shock, Organ Dysfunction and Resuscitation (SODIR) Research Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Daniel De Backer
- Chirec Hospitals, Université Libre de Bruxelles, Brussels, Belgium
| | - Craig M Coopersmith
- Department of Surgery and Emory Critical Care Center, Emory University, Atlanta, GA, USA
| | | |
Collapse
|
20
|
Mnatsakanyan N, Jonas EA. ATP synthase c-subunit ring as the channel of mitochondrial permeability transition: Regulator of metabolism in development and degeneration. J Mol Cell Cardiol 2020; 144:109-118. [PMID: 32461058 PMCID: PMC7877492 DOI: 10.1016/j.yjmcc.2020.05.013] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 05/07/2020] [Accepted: 05/20/2020] [Indexed: 12/29/2022]
Abstract
The mitochondrial permeability transition pore (mPTP) or mitochondrial megachannel is arguably one of the most mysterious phenomena in biology today. mPTP has been at the center of ongoing extensive scientific research for the last several decades. In this review we will discuss recent advances in the field that enhance our understanding of the molecular composition of mPTP, its regulatory mechanisms and its pathophysiological role. We will describe our recent findings on the role of ATP synthase c-subunit ring as a central player in mitochondrial permeability transition and as an important metabolic regulator during development and in degenerative diseases.
Collapse
Affiliation(s)
- Nelli Mnatsakanyan
- Section of Endocrinology, Department of Internal Medicine, Yale University, New Haven, CT, USA.
| | - Elizabeth Ann Jonas
- Section of Endocrinology, Department of Internal Medicine, Yale University, New Haven, CT, USA.
| |
Collapse
|
21
|
Brusletto BS, Løberg EM, Hellerud BC, Goverud IL, Berg JP, Olstad OK, Gopinathan U, Brandtzaeg P, Øvstebø R. Extensive Changes in Transcriptomic "Fingerprints" and Immunological Cells in the Large Organs of Patients Dying of Acute Septic Shock and Multiple Organ Failure Caused by Neisseria meningitidis. Front Cell Infect Microbiol 2020; 10:42. [PMID: 32154187 PMCID: PMC7045056 DOI: 10.3389/fcimb.2020.00042] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 01/22/2020] [Indexed: 12/16/2022] Open
Abstract
Background: Patients developing meningococcal septic shock reveal levels of Neisseria meningitidis (106-108/mL) and endotoxin (101-103 EU/mL) in the circulation and organs, leading to acute cardiovascular, pulmonary and renal failure, coagulopathy and a high case fatality rate within 24 h. Objective: To investigate transcriptional profiles in heart, lungs, kidneys, liver, and spleen and immunostain key inflammatory cells and proteins in post mortem formalin-fixed, paraffin-embedded (FFPE) tissue samples from meningococcal septic shock patients. Patients and Methods: Total RNA was isolated from FFPE and fresh frozen (FF) tissue samples from five patients and two controls (acute non-infectious death). Differential expression of genes was detected using Affymetrix microarray analysis. Lung and heart tissue samples were immunostained for T-and B cells, macrophages, neutrophils and the inflammatory markers PAI-1 and MCP-1. Inflammatory mediators were quantified in lysates from FF tissues. Results: The transcriptional profiles showed a complex pattern of protein-coding and non-coding RNAs with significant regulation of pathways associated with organismal death, cell death and survival, leukocyte migration, cellular movement, proliferation of cells, cell-to-cell signaling, immune cell trafficking, and inflammatory responses in an organ-specific clustering manner. The canonical pathways including acute phase response-, EIF2-, TREM1-, IL-6-, HMBG1-, PPAR signaling, and LXR/RXR activation were associated with acute heart, pulmonary, and renal failure. Fewer genes were regulated in the liver and particularly in the spleen. The main upstream regulators were TNF, IL-1β, IL-6, RICTOR, miR-6739-3p, and CD3. Increased numbers of inflammatory cells (CD68+, MPO+, CD3+, and CD20+) were found in lungs and heart. PAI-1 inhibiting fibrinolysis and MCP-1 attracting leukocyte were found significantly present in the septic tissue samples compared to the controls. Conclusions: FFPE tissue samples can be suitable for gene expression studies as well as immunostaining of specific cells or molecules. The most pronounced gene expression patterns were found in the organs with highest levels of Neisseria meningitidis DNA. Thousands of protein-coding and non-coding RNA transcripts were altered in lungs, heart and kidneys. We identified specific biomarker panels both protein-coding and non-coding RNA transcripts, which differed from organ to organ. Involvement of many genes and pathways add up and the combined effect induce organ failure.
Collapse
Affiliation(s)
- Berit Sletbakk Brusletto
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Else Marit Løberg
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Department of Pathology, Oslo University Hospital, Oslo, Norway
| | | | - Ingeborg Løstegaard Goverud
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Department of Pathology, Oslo University Hospital, Oslo, Norway
| | - Jens Petter Berg
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | | | - Unni Gopinathan
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Petter Brandtzaeg
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Department of Pediatrics, Oslo University Hospital, Oslo, Norway
| | - Reidun Øvstebø
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| |
Collapse
|
22
|
Hasegawa-Ishii S, Inaba M, Shimada A. Widespread time-dependent changes in tissue cytokine concentrations in brain regions during the acute phase of endotoxemia in mice. Neurotoxicology 2019; 76:67-74. [PMID: 31628962 DOI: 10.1016/j.neuro.2019.10.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 10/11/2019] [Accepted: 10/15/2019] [Indexed: 11/19/2022]
Abstract
Sepsis-associated encephalopathy (SAE) is a diffuse brain dysfunction induced by the systemic response to infection in septic patients. In the present study, we modeled SAE by administering lipopolysaccharide (LPS) intraperitoneally to mice at a concentration of 3.0 mg/kg. We investigated regional preferences for cytokine-mediated brain reactions to endotoxemia and at what time point brain inflammation begins, as well as what cytokines are involved in acute brain reactions. Brains were divided into seven parts: cortex (CTX), olfactory system (Olf), hippocampus (Hip), striatum (Str), diencephalon (Die), brain stem (BS), and cerebellum (CBL). In each brain region, we determined the tissue concentrations of 11 cytokines: CCL2, CCL3, CCL11, CXCL1, CXCL2, CXCL9, CXCL10, G-CSF, IL-1β, IL-6, and TNF-α, in mice injected with LPS or saline, at 1, 4, and 24 h after injection using multiplex cytokine assays. Every brain region responded with the production of multiple cytokines to LPS-induced systemic inflammation during the acute phase (4-24 h) after LPS injection. IL-6, CCL2, CCL3, CXCL1, CXCL2, CXCL9, and TNF-α were "early cytokines" that increased only at 4 h but not at 24 h after LPS injection in most brain regions. CCL11, CXCL10, and G-CSF were "late cytokines" that were elevated up to 24 h after LPS injection in selected brain regions. The regions Olf, Hip, and Die were the most responsive to endotoxemia; these regions produced ten cytokines and continued to produce three "late cytokines" up to 24 h after LPS injection. Str was the least responsive to endotoxemia. The widespread nature of brain cytokine production explains the characteristics of SAE. Further studies on the roles of CCL11, CXCL10, and G-CSF may be especially important in terms of potential prevention of SAE between 4 and 24 h after the onset of sepsis.
Collapse
Affiliation(s)
- Sanae Hasegawa-Ishii
- Pathology Research Team, Faculty of Health Sciences, Kyorin University, 5-4-1 Shimorenjaku, Mitaka, Tokyo, 181-8612, Japan
| | - Muneo Inaba
- First Department of Internal Medicine, Kansai Medical University, 2-5-1 Shinmachi, Hirakata, Osaka, 573-1010, Japan
| | - Atsuyoshi Shimada
- Pathology Research Team, Faculty of Health Sciences, Kyorin University, 5-4-1 Shimorenjaku, Mitaka, Tokyo, 181-8612, Japan; Central Hospital, Aichi Developmental Disability Center, 713-8 Kamiya, Kasugai, Aichi, 480-0392, Japan.
| |
Collapse
|
23
|
Serum Levels of Mitochondrial and Microbial Metabolites Reflect Mitochondrial Dysfunction in Different Stages of Sepsis. Metabolites 2019; 9:metabo9100196. [PMID: 31547099 PMCID: PMC6835733 DOI: 10.3390/metabo9100196] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 09/16/2019] [Accepted: 09/18/2019] [Indexed: 12/26/2022] Open
Abstract
Mechanisms of mitochondrial dysfunction in sepsis are being extensively studied in recent years. During our study, concentrations of microbial phenolic acids and mitochondrial metabolites (succinic, α-ketoglutaric, fumaric, itaconic acids) as indicators of sepsis and mitochondrial dysfunction, respectively, are measured by gas chromatography–mass spectrometry (GC–MS) in the blood of critically ill patients at the early and late stages of documented sepsis. The increase in levels of some phenylcarboxylic (phenyllactic (PhLA), p-hydroxyphenylacetic (p-HPhAA), p-hydroxyphenyllactic (p-HPhAA)) acids (PhCAs), simultaneously with a rise in levels of mitochondrial dicarboxylic acids, are mainly detected during the late stage of sepsis, especially succinic acid (up to 100–1000 µM). Itaconic acid is found in low concentrations (0.5–2.3 µM) only at early-stage sepsis. PhCAs in vitro inhibits succinate dehydrogenase (SDH) in isolated mitochondria but, unlike itaconic acid which acts as a competitive inhibitor of SDH, microbial metabolites most likely act on the ubiquinone binding site of the respiratory chain. A close correlation of the level of succinic acid in serum and sepsis-induced organ dysfunction is revealed, moreover the most significant correlation is observed at high concentrations of phenolic microbial metabolites (PhCAs) in late-stage sepsis. These data indicate the promise of such an approach for early detection, monitoring the progression of organ dysfunction and predicting the risk of non-survival in sepsis.
Collapse
|
24
|
Halbach JL, Prieto JM, Wang AW, Hawisher D, Cauvi DM, Reyes T, Okerblom J, Ramirez-Sanchez I, Villarreal F, Patel HH, Bickler SW, Perdrizet GA, De Maio A. Early hyperbaric oxygen therapy improves survival in a model of severe sepsis. Am J Physiol Regul Integr Comp Physiol 2019; 317:R160-R168. [PMID: 31091156 PMCID: PMC6692752 DOI: 10.1152/ajpregu.00083.2019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 05/06/2019] [Accepted: 05/08/2019] [Indexed: 12/20/2022]
Abstract
Sepsis is a major clinical challenge, with therapy limited to supportive interventions. Therefore, the search for novel remedial approaches is of great importance. We addressed whether hyperbaric oxygen therapy (HBOT) could improve the outcome of sepsis using an acute experimental mouse model. Sepsis was induced in male CD-1 mice by cecal ligation and puncture (CLP) tailored to result in 80-90% mortality within 72 h of the insult. After CLP, mice were randomized into two groups receiving HBOT or not at different times after the initial insult or subjected to multiple HBOT treatments. HBOT conditions were 98% oxygen pressurized to 2.4 atmospheres for 1 h. HBOT within 1 h after CLP resulted in 52% survival in comparison with mice that did not receive the treatment (13% survival). Multiple HBOT at 1 and 6 h or 1, 6, and 21 h displayed an increase in survival of >50%, but they were not significantly different from a single treatment after 1 h of CLP. Treatments at 6 or 21 h after CLP, excluding the 1 h of treatment, did not show any protective effect. Early HBO treatment did not modify bacterial counts after CLP, but it was associated with decreased expression of TNF-α, IL-6, and IL-10 expression in the liver within 3 h after CLP. The decrease of cytokine expression was reproduced in cultured macrophages after exposure to HBOT. Early HBOT could be of benefit in the treatment of sepsis, and the protective mechanism may be related to a reduction in the systemic inflammatory response.
Collapse
Affiliation(s)
- Jonathan L Halbach
- Department of Surgery, Naval Medical Center San Diego , San Diego, California
| | - James M Prieto
- Department of Surgery, Naval Medical Center San Diego , San Diego, California
| | - Andrew W Wang
- Department of Surgery, Naval Medical Center San Diego , San Diego, California
| | - Dennis Hawisher
- Division of Trauma, Critical Care, Burns, and Acute Care Surgery, Department of Surgery, School of Medicine, University of California San Diego , La Jolla, California
| | - David M Cauvi
- Division of Trauma, Critical Care, Burns, and Acute Care Surgery, Department of Surgery, School of Medicine, University of California San Diego , La Jolla, California
| | - Tony Reyes
- Univeristy of California San Diego Initiative for Maximizing Student Development Program, University of California San Diego , La Jolla, California
| | - Jonathan Okerblom
- Department of Anesthesiology, School of Medicine, University of California San Diego, and Veterans Affairs San Diego Healthcare System, La Jolla, California
| | - Israel Ramirez-Sanchez
- Department of Medicine, School of Medicine, University of California San Diego , La Jolla, California
| | - Francisco Villarreal
- Department of Medicine, School of Medicine, University of California San Diego , La Jolla, California
| | - Hemal H Patel
- Department of Anesthesiology, School of Medicine, University of California San Diego, and Veterans Affairs San Diego Healthcare System, La Jolla, California
| | - Stephen W Bickler
- Division of Pediatric Surgery, Rady Children's Hospital , San Diego, California
| | - George A Perdrizet
- Department of Emergency Medicine, School of Medicine, University of California San Diego , La Jolla, California
| | - Antonio De Maio
- Division of Trauma, Critical Care, Burns, and Acute Care Surgery, Department of Surgery, School of Medicine, University of California San Diego , La Jolla, California
- Department of Neurosciences, School of Medicine, University of California San Diego , La Jolla, California
| |
Collapse
|
25
|
Abstract
Platelet contraction provides a minimally invasive source for physiologic information. In this article, we describe a device that directly measures the kinetics of platelet contraction. Whole blood is injected between acrylic plates and an adherent clot forms. The bottom plate is fixed, and the top plate is attached to a wire cantilever. Platelet contraction drives deflection of the wire cantilever which is captured by a camera. Force generated by the clot with time is derived using beam equations. Force derivations were verified using a microelectromechanical (MEMS) force sensor. Kinetics of clot contraction were defined, including maximum contraction force (FMAX), lift-off time (TLIFTOFF), and contraction rate (CR). Metrics were compared with optical aggregometry and thromboelastography. FMAX correlates with optical aggregometry maximal amplitude with a Spearman's rho of 0.7904 and p = 0.0195 and thromboelastography maximal amplitude with a Spearman's rho of 0.8857 and p = 0.0188. Lift-off time correlates with optical aggregometry lag time with a Spearman's rho of 0.9048 and p = 0.002. This preliminary study demonstrates the repeatability of a useful platelet contraction device and its correlation with thromboelastography and optical aggregometry, the gold standard platelet function test.
Collapse
|
26
|
Li J, Shi W, Zhang J, Ren L. To Explore the Protective Mechanism of PTEN-Induced Kinase 1 (PINK1)/Parkin Mitophagy-Mediated Extract of Periplaneta Americana on Lipopolysaccharide-Induced Cardiomyocyte Injury. Med Sci Monit 2019; 25:1383-1391. [PMID: 30789157 PMCID: PMC6394139 DOI: 10.12659/msm.912980] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Sepsis is defined as a systemic inflammatory response syndrome caused by an infection (suspicious or confirmed). Its essence is inflammatory mediators and cytokines mediated by host immune response. The present study aimed to investigate the role of Periplaneta americana extracts (XML) on PTEN-induced kinase 1 (PINK1)/Parkin mediated mitophagy in cardiomyocyte injury by sepsis. MATERIAL AND METHODS H9C2 cells were cultured and transfected with Mdivi-1 and Atg7 siRNA. The cell viability and drug toxicity were detected using Cell Counting Kit-8 assay. ELISA (enzyme-linked immunosorbent assay) was used to assess cardiac injury factors and inflammatory factors. Fluorescence levels of LC3 were detected using immunofluorescence assay. Then, the protein and mRNA expression levels were analyzed using western blot and qRT-PCR. Intracellular adenosine triphosphate (ATP) levels were measured using an ATP kit. Finally, flow cytometry was used to detected apoptosis. RESULTS The result showed that XML significantly increase cell viability in H9C2 cells. Compared with XML+LPS (lipopolysaccharide) group, the level of cTNI, CK-MB, interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α was significantly upregulation in LPS+XML+Mdivi-1 or LPS+XML+Atg7 siRNA group. In addition, the release of LC3 was significant decreased. The protein and mRNA expression of PINK1, Parkin, Nix, Beclin-1 was significantly increased, but decreased expression of Mitofusin1, Mitofusin2, Opa1, Drp1, and P62 in LPS+XML+Mdivi-1 or LPS+XML+Atg7 siRNA groups. More importantly, we found that cell apoptosis was induced by Mdivi-1 and Atg7 siRNA. CONCLUSIONS The study provided evidence that XML regulated the process of LPS-induced cardiomyocyte injury through mitophagy by the PINK1/Parkin pathway.
Collapse
Affiliation(s)
- Jie Li
- Department of Geriatrics, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China (mainland)
| | - Wei Shi
- Department of Geriatrics, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China (mainland)
| | - Jun Zhang
- Department of Geriatrics, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China (mainland)
| | - Liqun Ren
- Department of Geriatrics, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China (mainland)
| |
Collapse
|
27
|
Kokkinaki D, Hoffman M, Kalliora C, Kyriazis ID, Maning J, Lucchese AM, Shanmughapriya S, Tomar D, Park JY, Wang H, Yang XF, Madesh M, Lymperopoulos A, Koch WJ, Christofidou-Solomidou M, Drosatos K. Chemically synthesized Secoisolariciresinol diglucoside (LGM2605) improves mitochondrial function in cardiac myocytes and alleviates septic cardiomyopathy. J Mol Cell Cardiol 2019; 127:232-245. [PMID: 30611795 PMCID: PMC6359996 DOI: 10.1016/j.yjmcc.2018.12.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 12/14/2018] [Accepted: 12/27/2018] [Indexed: 02/07/2023]
Abstract
Sepsis is the overwhelming systemic immune response to infection, which can result in multiple organ dysfunction and septic shock. Myocardial dysfunction during sepsis is associated with advanced disease and significantly increased in-hospital mortality. Our group has shown that energetic failure and excess reactive oxygen species (ROS) generation constitute major components of myocardial dysfunction in sepsis. Because ROS production is central to cellular metabolic health, we tested if the synthetic anti-oxidant lignan secoisolariciresinol diglucoside (SDG; LGM2605) would alleviate septic cardiac dysfunction and investigated the underlying mechanism. Using the cecal ligation and puncture (CLP) mouse model of peritonitis-induced sepsis, we observed impairment of cardiac function beginning at 4 h post-CLP surgery. Treatment of mice with LGM2605 (100 mg/kg body weight, i.p.) 6 h post-CLP surgery reduced cardiac ROS accumulation and restored cardiac function. Assessment of mitochondrial respiration (Seahorse XF) in primary cardiomyocytes obtained from adult C57BL/6 mice that had undergone CLP and treatment with LGM2605 showed restored basal and maximal respiration, as well as preserved oxygen consumption rate (OCR) associated with spare capacity. Further analyses aiming to identify the cellular mechanisms that may account for improved cardiac function showed that LGM2605 restored mitochondria abundance, increased mitochondrial calcium uptake and preserved mitochondrial membrane potential. In addition to protecting against cardiac dysfunction, daily treatment with LGM2605 and antibiotic ertapenem (70 mg/kg) protected against CLP-associated mortality and reversed hypothermia when compared against mice receiving ertapenem and saline. Therefore, treatment of septic mice with LGM2605 emerges as a novel pharmacological approach that reduces cardiac ROS accumulation, protects cardiac mitochondrial function, alleviates cardiac dysfunction, and improves survival.
Collapse
Affiliation(s)
- Dimitra Kokkinaki
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA; Faculty of Medicine, University of Crete, Voutes, Greece
| | - Matthew Hoffman
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Charikleia Kalliora
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA; Faculty of Medicine, University of Crete, Voutes, Greece
| | - Ioannis D Kyriazis
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Jennifer Maning
- Laboratory for the Study of Neurohormonal Control of the Circulation, Nova Southeastern University College of Pharmacy, Fort Lauderdale, FL, USA
| | - Anna Maria Lucchese
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Santhanam Shanmughapriya
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Dhanendra Tomar
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Joon Young Park
- Cardiovascular Research Center, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Hong Wang
- Cardiovascular Research Center, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA; Center for Metabolic Disease Research, Department of Pharmacology Lewis Katz School of Medicine, Temple University, 3500 Broad Street, Philadelphia, PA 19140, USA
| | - Xiao-Feng Yang
- Cardiovascular Research Center, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA; Center for Metabolic Disease Research, Department of Pharmacology Lewis Katz School of Medicine, Temple University, 3500 Broad Street, Philadelphia, PA 19140, USA
| | - Muniswamy Madesh
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Anastasios Lymperopoulos
- Laboratory for the Study of Neurohormonal Control of the Circulation, Nova Southeastern University College of Pharmacy, Fort Lauderdale, FL, USA
| | - Walter J Koch
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Melpo Christofidou-Solomidou
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Pennsylvania Perelman School of Medicine, USA
| | - Konstantinos Drosatos
- Center for Translational Medicine and Department of Pharmacology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA.
| |
Collapse
|
28
|
|
29
|
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.
Collapse
|
30
|
Ferreira CA, Ni D, Rosenkrans ZT, Cai W. Scavenging of reactive oxygen and nitrogen species with nanomaterials. NANO RESEARCH 2018; 11:4955-4984. [PMID: 30450165 PMCID: PMC6233906 DOI: 10.1007/s12274-018-2092-y] [Citation(s) in RCA: 158] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Reactive oxygen and nitrogen species (RONS) are essential for normal physiological processes and play important roles in cell signaling, immunity, and tissue homeostasis. However, excess radical species are implicated in the development and augmented pathogenesis of various diseases. Several antioxidants may restore the chemical balance, but their use is limited by disappointing results of clinical trials. Nanoparticles are an attractive therapeutic alternative because they can change the biodistribution profile of antioxidants, and possess intrinsic ability to scavenge RONS. Herein, we review the types of RONS, how they are implicated in several diseases, and the types of nanoparticles with inherent antioxidant capability, their mechanisms of action, and their biological applications.
Collapse
Affiliation(s)
| | - Dalong Ni
- Address correspondence to Dalong Ni, ; Weibo Cai,
| | | | - Weibo Cai
- Address correspondence to Dalong Ni, ; Weibo Cai,
| |
Collapse
|
31
|
Rosenstein PG, Tennent-Brown BS, Hughes D. Clinical use of plasma lactate concentration. Part 1: Physiology, pathophysiology, and measurement. J Vet Emerg Crit Care (San Antonio) 2018. [PMID: 29533512 DOI: 10.1111/vec.12708] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To review the current literature with respect to the physiology, pathophysiology, and measurement of lactate. DATA SOURCES Data were sourced from veterinary and human clinical trials, retrospective studies, experimental studies, and review articles. Articles were retrieved without date restrictions and were sourced primarily via PubMed, Scopus, and CAB Abstracts as well as by manual selection. HUMAN AND VETERINARY DATA SYNTHESIS Lactate is an important energy storage molecule, the production of which preserves cellular energy production and mitigates the acidosis from ATP hydrolysis. Although the most common cause of hyperlactatemia is inadequate tissue oxygen delivery, hyperlactatemia can, and does occur in the face of apparently adequate oxygen supply. At a cellular level, the pathogenesis of hyperlactatemia varies widely depending on the underlying cause. Microcirculatory dysfunction, mitochondrial dysfunction, and epinephrine-mediated stimulation of Na+ -K+ -ATPase pumps are likely important contributors to hyperlactatemia in critically ill patients. Ultimately, hyperlactatemia is a marker of altered cellular bioenergetics. CONCLUSION The etiology of hyperlactatemia is complex and multifactorial. Understanding the relevant pathophysiology is helpful when characterizing hyperlactatemia in clinical patients.
Collapse
Affiliation(s)
- Patricia G Rosenstein
- Department of Veterinary Clinical Sciences, Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Werribee, Victoria, Australia
| | - Brett S Tennent-Brown
- Department of Veterinary Clinical Sciences, Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Werribee, Victoria, Australia
| | - Dez Hughes
- Department of Veterinary Clinical Sciences, Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Werribee, Victoria, Australia
| |
Collapse
|
32
|
Abstract
Despite several decades of focused investigation, sepsis remains a major cause of mortality in critically ill patients. Advancements in intensive care have enabled more patients to survive the acute phase of sepsis than previously, but a growing number of them progress to chronic critical illness. The failure of previous randomized clinical trials of anti-inflammatory agents to show any pro-survival benefit in septic patients underscores current thought that simple anti-inflammatory strategies are ineffective because the inhibitory effect of anti-inflammatory agents undermines the immune response to pathogens. New strategies with the dual capability of ameliorating inflammation in organs while stimulating antimicrobial activity are eagerly awaited. On the other hand, the metabolic alterations associated with systemic inflammatory response, including mitochondrial dysfunction and metabolic shift, are closely linked through a nexus of signaling pathways and signaling molecules. Preventing these metabolic derangements may be an alternative way to control excessive inflammation, an intriguing possibility that has not been fully explored. New insight into the molecular pathogenesis of sepsis and sepsis-associated chronic critical illness has led to the recognition of septic cachexia, a life-threatening form of metabolic inflammatory complex associated with multiple organ dysfunction. The potential for septic cachexia to serve as a novel target disease state to improve the clinical outcome of septic patients is discussed in this review.
Collapse
Affiliation(s)
- Masao Kaneki
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Shriners Hospitals for Children, Harvard Medical School, Charlestown, Massachusetts
| |
Collapse
|
33
|
Abstract
Three therapeutic principles most substantially improve organ dysfunction and survival in sepsis: early, appropriate antimicrobial therapy; restoration of adequate cellular perfusion; timely source control. The new definitions of sepsis and septic shock reflect the inadequate sensitivity, specify, and lack of prognostication of systemic inflammatory response syndrome criteria. Sequential (sepsis-related) organ failure assessment more effectively prognosticates in sepsis and critical illness. Inadequate cellular perfusion accelerates injury and reestablishing perfusion limits injury. Multiple organ systems are affected by sepsis and septic shock and an evidence-based multipronged approach to systems-based therapy in critical illness results in improve outcomes.
Collapse
Affiliation(s)
- Bracken A Armstrong
- Division of Trauma and Surgical Critical Care, Department of Surgery, Vanderbilt University Medical Center, 1211 21st Ave S Medical Arts Building 404, Nashville, TN 37212, USA.
| | - Richard D Betzold
- Division of Trauma and Surgical Critical Care, Department of Surgery, Vanderbilt University Medical Center, 1211 21st Ave S Medical Arts Building 404, Nashville, TN 37212, USA
| | - Addison K May
- Division of Trauma and Surgical Critical Care, Department of Surgery, Vanderbilt University Medical Center, 1211 21st Ave S Medical Arts Building 404, Nashville, TN 37212, USA
| |
Collapse
|
34
|
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: 49] [Impact Index Per Article: 7.0] [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.
Collapse
|
35
|
Maestraggi Q, Lebas B, Clere-Jehl R, Ludes PO, Chamaraux-Tran TN, Schneider F, Diemunsch P, Geny B, Pottecher J. Skeletal Muscle and Lymphocyte Mitochondrial Dysfunctions in Septic Shock Trigger ICU-Acquired Weakness and Sepsis-Induced Immunoparalysis. BIOMED RESEARCH INTERNATIONAL 2017; 2017:7897325. [PMID: 28589148 PMCID: PMC5447268 DOI: 10.1155/2017/7897325] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 03/16/2017] [Accepted: 04/23/2017] [Indexed: 12/20/2022]
Abstract
Fundamental events driving the pathological processes of septic shock-induced multiorgan failure (MOF) at the cellular and subcellular levels remain debated. Emerging data implicate mitochondrial dysfunction as a critical factor in the pathogenesis of sepsis-associated MOF. If macrocirculatory and microcirculatory dysfunctions undoubtedly participate in organ dysfunction at the early stage of septic shock, an intrinsic bioenergetic failure, sometimes called "cytopathic hypoxia," perpetuates cellular dysfunction. Short-term failure of vital organs immediately threatens patient survival but long-term recovery is also severely hindered by persistent dysfunction of organs traditionally described as nonvital, such as skeletal muscle and peripheral blood mononuclear cells (PBMCs). In this review, we will stress how and why a persistent mitochondrial dysfunction in skeletal muscles and PBMC could impair survival in patients who overcome the first acute phase of their septic episode. First, muscle wasting protracts weaning from mechanical ventilation, increases the risk of mechanical ventilator-associated pneumonia, and creates a state of ICU-acquired muscle weakness, compelling the patient to bed. Second, failure of the immune system ("immunoparalysis") translates into its inability to clear infectious foci and predisposes the patient to recurrent nosocomial infections. We will finally emphasize how mitochondrial-targeted therapies could represent a realistic strategy to promote long-term recovery after sepsis.
Collapse
Affiliation(s)
- Quentin Maestraggi
- Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Service de Réanimation Médicale, avenue Molière, 67098 Strasbourg Cedex, France
- Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de Médecine, Institut de Physiologie, Equipe d'Accueil 3072 “Mitochondrie, Stress Oxydant et Protection Musculaire”, 11 rue Human, 67000 Strasbourg, France
| | - Benjamin Lebas
- Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de Médecine, Institut de Physiologie, Equipe d'Accueil 3072 “Mitochondrie, Stress Oxydant et Protection Musculaire”, 11 rue Human, 67000 Strasbourg, France
- Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Service d'Anesthésie-Réanimation Chirurgicale, avenue Molière, 67098 Strasbourg Cedex, France
| | - Raphaël Clere-Jehl
- Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Service de Réanimation Médicale, avenue Molière, 67098 Strasbourg Cedex, France
- Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de Médecine, Institut de Physiologie, Equipe d'Accueil 3072 “Mitochondrie, Stress Oxydant et Protection Musculaire”, 11 rue Human, 67000 Strasbourg, France
| | - Pierre-Olivier Ludes
- Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de Médecine, Institut de Physiologie, Equipe d'Accueil 3072 “Mitochondrie, Stress Oxydant et Protection Musculaire”, 11 rue Human, 67000 Strasbourg, France
- Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Service d'Anesthésie-Réanimation Chirurgicale, avenue Molière, 67098 Strasbourg Cedex, France
| | - Thiên-Nga Chamaraux-Tran
- Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de Médecine, Institut de Physiologie, Equipe d'Accueil 3072 “Mitochondrie, Stress Oxydant et Protection Musculaire”, 11 rue Human, 67000 Strasbourg, France
- Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Service d'Anesthésie-Réanimation Chirurgicale, avenue Molière, 67098 Strasbourg Cedex, France
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Francis Schneider
- Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Service de Réanimation Médicale, avenue Molière, 67098 Strasbourg Cedex, France
- Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de Médecine, Institut de Physiologie, Equipe d'Accueil 3072 “Mitochondrie, Stress Oxydant et Protection Musculaire”, 11 rue Human, 67000 Strasbourg, France
| | - Pierre Diemunsch
- Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de Médecine, Institut de Physiologie, Equipe d'Accueil 3072 “Mitochondrie, Stress Oxydant et Protection Musculaire”, 11 rue Human, 67000 Strasbourg, France
- Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Service d'Anesthésie-Réanimation Chirurgicale, avenue Molière, 67098 Strasbourg Cedex, France
| | - Bernard Geny
- Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de Médecine, Institut de Physiologie, Equipe d'Accueil 3072 “Mitochondrie, Stress Oxydant et Protection Musculaire”, 11 rue Human, 67000 Strasbourg, France
- Hôpitaux Universitaires de Strasbourg, Nouvel Hôpital Civil, Service de Physiologie et d'Explorations Fonctionnelles, 1 Place de l'Hôpital, 67091 Strasbourg Cedex, France
| | - Julien Pottecher
- Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de Médecine, Institut de Physiologie, Equipe d'Accueil 3072 “Mitochondrie, Stress Oxydant et Protection Musculaire”, 11 rue Human, 67000 Strasbourg, France
- Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Service d'Anesthésie-Réanimation Chirurgicale, avenue Molière, 67098 Strasbourg Cedex, France
| |
Collapse
|
36
|
Abstract
OBJECTIVE To describe the pathophysiology associated with multiple organ dysfunction syndrome in children. DATA SOURCES Literature review, research data, and expert opinion. STUDY SELECTION Not applicable. DATA EXTRACTION Moderated by an experienced expert from the field, pathophysiologic processes associated with multiple organ dysfunction syndrome in children were described, discussed, and debated with a focus on identifying knowledge gaps and research priorities. DATA SYNTHESIS Summary of presentations and discussion supported and supplemented by relevant literature. CONCLUSIONS Experiment modeling suggests that persistent macrophage activation may be a pathophysiologic basis for multiple organ dysfunction syndrome. Children with multiple organ dysfunction syndrome have 1) reduced cytochrome P450 metabolism inversely proportional to inflammation; 2) increased circulating damage-associated molecular pattern molecules from injured tissues; 3) increased circulating pathogen-associated molecular pattern molecules from infection or endogenous microbiome; and 4) cytokine-driven epithelial, endothelial, mitochondrial, and immune cell dysfunction. Cytochrome P450s metabolize endogenous compounds and xenobiotics, many of which ameliorate inflammation, whereas damage-associated molecular pattern molecules and pathogen-associated molecular pattern molecules alone and together amplify the cytokine production leading to the inflammatory multiple organ dysfunction syndrome response. Genetic and environmental factors can impede inflammation resolution in children with a spectrum of multiple organ dysfunction syndrome pathobiology phenotypes. Thrombocytopenia-associated multiple organ dysfunction syndrome patients have extensive endothelial activation and thrombotic microangiopathy with associated oligogenic deficiencies in inhibitory complement and a disintegrin and metalloproteinase with a thrombospondin type 1 motif, member 13. Sequential multiple organ dysfunction syndrome patients have soluble Fas ligand-Fas-mediated hepatic failure with associated oligogenic deficiencies in perforin and granzyme signaling. Immunoparalysis-associated multiple organ dysfunction syndrome patients have impaired ability to resolve infection and have associated environmental causes of lymphocyte apoptosis. These inflammation phenotypes can lead to macrophage activation syndrome. Resolution of multiple organ dysfunction syndrome requires elimination of the source of inflammation. Full recovery of organ functions is noted 6-18 weeks later when epithelial, endothelial, mitochondrial, and immune cell regeneration and reprogramming is completed.
Collapse
|
37
|
Shimada A, Hasegawa-Ishii S. Histological Architecture Underlying Brain-Immune Cell-Cell Interactions and the Cerebral Response to Systemic Inflammation. Front Immunol 2017; 8:17. [PMID: 28154566 PMCID: PMC5243818 DOI: 10.3389/fimmu.2017.00017] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 01/05/2017] [Indexed: 11/18/2022] Open
Abstract
Although the brain is now known to actively interact with the immune system under non-inflammatory conditions, the site of cell–cell interactions between brain parenchymal cells and immune cells has been an open question until recently. Studies by our and other groups have indicated that brain structures such as the leptomeninges, choroid plexus stroma and epithelium, attachments of choroid plexus, vascular endothelial cells, cells of the perivascular space, circumventricular organs, and astrocytic endfeet construct the histological architecture that provides a location for intercellular interactions between bone marrow-derived myeloid lineage cells and brain parenchymal cells under non-inflammatory conditions. This architecture also functions as the interface between the brain and the immune system, through which systemic inflammation-induced molecular events can be relayed to the brain parenchyma at early stages of systemic inflammation during which the blood–brain barrier is relatively preserved. Although brain microglia are well known to be activated by systemic inflammation, the mechanism by which systemic inflammatory challenge and microglial activation are connected has not been well documented. Perturbed brain–immune interaction underlies a wide variety of neurological and psychiatric disorders including ischemic brain injury, status epilepticus, repeated social defeat, and neurodegenerative diseases such as Alzheimer’s disease and Parkinson’s disease. Proinflammatory status associated with cytokine imbalance is involved in autism spectrum disorders, schizophrenia, and depression. In this article, we propose a mechanism connecting systemic inflammation, brain–immune interface cells, and brain parenchymal cells and discuss the relevance of basic studies of the mechanism to neurological disorders with a special emphasis on sepsis-associated encephalopathy and preterm brain injury.
Collapse
Affiliation(s)
- Atsuyoshi Shimada
- Department of Pathology and Laboratory Medicine, Central Hospital, Aichi Human Service Center , Kasugai, Aichi , Japan
| | - Sanae Hasegawa-Ishii
- Department of Pharmacology, Pennsylvania State University College of Medicine , Hershey, PA , USA
| |
Collapse
|
38
|
Ostojic SM. Impaired Bioenergetics in Clinical Medicine: A Target to Tackle. TOHOKU J EXP MED 2017; 243:227-235. [DOI: 10.1620/tjem.243.227] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Sergej M. Ostojic
- Faculty of Sport and Physical Education, University of Novi Sad
- University of Belgrade School of Medicine
| |
Collapse
|
39
|
Lipopolysaccharide Disrupts Mitochondrial Physiology in Skeletal Muscle via Disparate Effects on Sphingolipid Metabolism. Shock 2016; 44:585-92. [PMID: 26529656 PMCID: PMC4851226 DOI: 10.1097/shk.0000000000000468] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Lipopolysaccharides (LPS) are prevalent pathogenic molecules that are found within tissues and blood. Elevated circulating LPS is a feature of obesity and sepsis, both of which are associated with mitochondrial abnormalities that are key pathological features of LPS excess. However, the mechanism of LPS-induced mitochondrial alterations remains poorly understood. Herein we demonstrate the necessity of sphingolipid accrual in mediating altered mitochondrial physiology in skeletal muscle following LPS exposure. In particular, we found LPS elicited disparate effects on the sphingolipids dihydroceramides (DhCer) and ceramides (Cer) in both cultured myotubes and in muscle of LPS-injected mice. Although LPS-treated myotubes had reduced DhCer and increased Cer as well as increased mitochondrial respiration, muscle from LPS-injected mice manifested a reverse trend, namely elevated DhCer, but reduced Cer as well as reduced mitochondrial respiration. In addition, we found that LPS treatment caused mitochondrial fission, likely via dynamin-related protein 1, and increased oxidative stress. However, inhibition of de novo sphingolipid biosynthesis via myriocin protected normal mitochondrial function in spite of LPS, but inhibition of DhCer desaturase 1, which increases DhCer, but not Cer, exacerbated mitochondrial respiration with LPS. In an attempt to reconcile the incongruent effects of LPS in isolated muscle cells and whole muscle tissue, we incubated myotubes with conditioned medium from treated macrophages. In contrast to direct myotube LPS treatment, conditioned medium from LPS-treated macrophages reduced myotube respiration, but this was again mitigated with sphingolipid inhibition. Thus, macrophage sphingolipid production appears to be necessary for LPS-induced mitochondrial alterations in skeletal muscle tissue.
Collapse
|
40
|
Martin L, Peters C, Heinbockel L, Moellmann J, Martincuks A, Brandenburg K, Lehrke M, Müller-Newen G, Marx G, Schuerholz T. The synthetic antimicrobial peptide 19-2.5 attenuates mitochondrial dysfunction in cardiomyocytes stimulated with human sepsis serum. Innate Immun 2016; 22:612-619. [DOI: 10.1177/1753425916667474] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Septic cardiomyopathy affects up to 70% of patients with septic shock and the derangement of cardiac mitochondrial function contributes to the likelihood of death. However, at present, there is no specific therapeutic drug available. The peroxisome proliferator-activated receptor (PPAR)-γ coactivator-1α (PGC-1α) and coactivator-1β (PGC-1β) modulate members of the PPARs, which regulate mitochondrial energy metabolism and the production of mitochondrial reactive oxygen species in the heart. This study investigated the potential of the newly developed synthetic antimicrobial peptide 19-2.5 (Pep2.5) to attenuate mitochondrial dysfunction in murine cardiomyocytes stimulated with serum from septic shock patients. Pep2.5 treatment attenuated the suppression of PPAR-α, PPAR-γ ( P = 0.0004 and P = 0.0001, respectively) and PGC-1α/β ( P = 0.0008 and P = 0.0147, respectively) in cardiomyocytes stimulated with serum from septic shock patients compared with untreated cells. Pep2.5 treatment enhanced the mitochondrial maximum respiration ( P < 0.0001), increased cellular ATP levels ( P < 0.0001) and reduced the production of mitochondrial reactive oxygen species. Thus, the administration of Pep2.5 may have the potential as a promising therapeutic approach in septic cardiomyopathy by attenuating mitochondrial dysfunction in the septic heart.
Collapse
Affiliation(s)
- Lukas Martin
- Department of Intensive Care and Intermediate Care, University Hospital Aachen, Aachen, Germany
| | - Carsten Peters
- Department of Intensive Care and Intermediate Care, University Hospital Aachen, Aachen, Germany
| | - Lena Heinbockel
- Clinical and Experimental Pathology, Forschungszentrum Borstel, Borstel, Germany
| | - Julia Moellmann
- Department of Cardiology, Pneumology, Angiology and Intensive Care, University Hospital Aachen, Aachen, Germany
| | - Antons Martincuks
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Aachen, Germany
| | | | - Michael Lehrke
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Aachen, Germany
| | - Gerhard Müller-Newen
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Aachen, Germany
| | - Gernot Marx
- Department of Intensive Care and Intermediate Care, University Hospital Aachen, Aachen, Germany
| | - Tobias Schuerholz
- Department of Intensive Care and Intermediate Care, University Hospital Aachen, Aachen, Germany
| |
Collapse
|
41
|
Ding R, Han J, Zhao D, Hu Z, Ma X. Pretreatment with Rho-kinase inhibitor ameliorates lethal endotoxemia-induced liver injury by improving mitochondrial function. Int Immunopharmacol 2016; 40:125-130. [PMID: 27588912 DOI: 10.1016/j.intimp.2016.08.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 08/09/2016] [Accepted: 08/26/2016] [Indexed: 12/26/2022]
Abstract
Rho kinase (ROCK) inhibition has been reported to improve various inflammatory diseases including endotoxemia. Mitochondrial dysfunction might be the key to the pathophysiology of sepsis-induced organ failure. Therefore, this study aimed to explore whether ROCK inhibition protects against the liver injury by regulating mitochondrial function in endotoxemia model mice. The mice were randomly divided into four groups (N=6-8 per group): control, LPS, LPS+Y-27632 (LPS+Y), and LPS+Mito-TEMPO (LPS+M). For induction of endotoxin-induced acute liver injury, the mice were intraperitoneally administered lipopolysaccharide (LPS, 20mg/kg). The ROCK inhibitor Y-27632 (or mitochondrial antioxidant Mito-TEMPO) was intraperitoneally administered at 18 and 1h before injection of LPS. The mice were euthanized 8h after LPS administration. The liver and blood samples were taken and preserved for analysis. Results of this study showed that pretreatment with Y-27632 or Mito-TEMPO significantly attenuated the liver injury as compared to the LPS group. This was confirmed by decreased plasma alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels, and by reduced hepatocellular apoptosis and histologic damage. Pretreatment with Y-27632 or Mito-TEMPO markedly reduced the LPS-induced inflammatory response and oxidative stress the in liver. Furthermore, it showed similar protective effects on the hepatic mitochondrial function, including an increased activity of complexes I and IV and mitochondrial superoxide dismutase (MnSOD), and an upregulated expression of mtDNA-encoded genes. Taken together, these data demonstrate that Mito-TEMPO can potently inhibit the endotoxin-induced mitochondrial and hepatic abnormalities and indicate that mitochondrial dysfunction might play a key role in the endotoxemia-induced acute liver injury. Moreover, our study shows that ROCK inhibition protects against the endotoxemia-induced liver injury by improving the mitochondrial function.
Collapse
Affiliation(s)
- Renyu Ding
- Department of Intensive Care Unit, The First Hospital of China Medical University, Nanjing Bei Street 155, Shenyang 110001, Liaoning Province, PR China.
| | - Jiali Han
- Department of Otolaryngology, The First Hospital of China Medical University, Nanjing Bei Street 155, Shenyang 110001, Liaoning Province, PR China
| | - Dongmei Zhao
- Department of Intensive Care Unit, The First Hospital of China Medical University, Nanjing Bei Street 155, Shenyang 110001, Liaoning Province, PR China
| | - Ziwei Hu
- Department of Intensive Care Unit, The First Hospital of China Medical University, Nanjing Bei Street 155, Shenyang 110001, Liaoning Province, PR China
| | - Xiaochun Ma
- Department of Intensive Care Unit, The First Hospital of China Medical University, Nanjing Bei Street 155, Shenyang 110001, Liaoning Province, PR China.
| |
Collapse
|
42
|
Neri M, Riezzo I, Pomara C, Schiavone S, Turillazzi E. Oxidative-Nitrosative Stress and Myocardial Dysfunctions in Sepsis: Evidence from the Literature and Postmortem Observations. Mediators Inflamm 2016; 2016:3423450. [PMID: 27274621 PMCID: PMC4870364 DOI: 10.1155/2016/3423450] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Accepted: 04/11/2016] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Myocardial depression in sepsis is common, and it is associated with higher mortality. In recent years, the hypothesis that the myocardial dysfunction during sepsis could be mediated by ischemia related to decreased coronary blood flow waned and a complex mechanism was invoked to explain cardiac dysfunction in sepsis. Oxidative stress unbalance is thought to play a critical role in the pathogenesis of cardiac impairment in septic patients. AIM In this paper, we review the current literature regarding the pathophysiology of cardiac dysfunction in sepsis, focusing on the possible role of oxidative-nitrosative stress unbalance and mitochondria dysfunction. We discuss these mechanisms within the broad scenario of cardiac involvement in sepsis. CONCLUSIONS Findings from the current literature broaden our understanding of the role of oxidative and nitrosative stress unbalance in the pathophysiology of cardiac dysfunction in sepsis, thus contributing to the establishment of a relationship between these settings and the occurrence of oxidative stress. The complex pathogenesis of septic cardiac failure may explain why, despite the therapeutic strategies, sepsis remains a big clinical challenge for effectively managing the disease to minimize mortality, leading to consideration of the potential therapeutic effects of antioxidant agents.
Collapse
Affiliation(s)
- M. Neri
- Institute of Forensic Pathology, Department of Clinical and Experimental Medicine, University of Foggia, Ospedale Colonnello D'Avanzo, Viale degli Aviatori 1, 71100 Foggia, Italy
| | - I. Riezzo
- Institute of Forensic Pathology, Department of Clinical and Experimental Medicine, University of Foggia, Ospedale Colonnello D'Avanzo, Viale degli Aviatori 1, 71100 Foggia, Italy
| | - C. Pomara
- Institute of Forensic Pathology, Department of Clinical and Experimental Medicine, University of Foggia, Ospedale Colonnello D'Avanzo, Viale degli Aviatori 1, 71100 Foggia, Italy
| | - S. Schiavone
- Institute of Pharmacology, Department of Clinical and Experimental Medicine, University of Foggia, Via L. Pinto 1, 71100 Foggia, Italy
| | - E. Turillazzi
- Institute of Forensic Pathology, Department of Clinical and Experimental Medicine, University of Foggia, Ospedale Colonnello D'Avanzo, Viale degli Aviatori 1, 71100 Foggia, Italy
| |
Collapse
|
43
|
Soraya H, Masoud WGT, Gandhi M, Garjani A, Clanachan AS. Myocardial mechanical dysfunction following endotoxemia: role of changes in energy substrate metabolism. Basic Res Cardiol 2016; 111:24. [DOI: 10.1007/s00395-016-0544-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 02/17/2016] [Indexed: 01/06/2023]
|
44
|
Waltz P, Carchman E, Gomez H, Zuckerbraun B. Sepsis results in an altered renal metabolic and osmolyte profile. J Surg Res 2015; 202:8-12. [PMID: 27083942 DOI: 10.1016/j.jss.2015.12.011] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 11/24/2015] [Accepted: 12/01/2015] [Indexed: 11/16/2022]
Abstract
BACKGROUND Sepsis remains a major health-care burden and source of morbidity and mortality. Acute kidney injury and failure frequently accompanies severe sepsis and contributes to this burden. Despite a great deal of research, the exact mechanisms underlying renal failure in sepsis are poorly understood. This study aims to further understand metabolic changes in renal tissue during sepsis. MATERIALS AND METHODS Experimental sepsis was induced by cecal ligation and puncture (CLP) in C57BL/6 mice. Serum and organs were harvested 8 h after CLP. Markers of renal function including serum creatinine, blood urea nitrogen, and cystatin C were measured. Whole kidneys were analyzed for a global biochemical profile via liquid chromatography/tandem mass spectrometry by Metabolon. RESULTS CLP induced renal injury as evidenced by elevated serum creatinine, blood urea nitrogen, and cystatin C. Global energetic profile in sepsis showed an increase in glycolytic intermediates with decreased flux through the tricarboxylic acid (TCA) cycle. Multiple inflammatory markers were elevated in response to CLP. Levels of osmotic regulators varied, with an overall increase in pinitol, urea, and taurine in response to CLP. CONCLUSIONS CLP resulted in dramatic changes in the renal macromolecular milieu. There appears to be an increased dependence on glycolysis and diminished flush through the TCA cycle. In addition, changes in renal osmolytes including pinitol, urea, and taurine were observed, perhaps uncovering an additional change with implications on renal function during sepsis.
Collapse
Affiliation(s)
- Paul Waltz
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Evie Carchman
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Hernando Gomez
- Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Brian Zuckerbraun
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania; VA Pittsburgh Healthcare System, University Dr C, Pittsburgh, Pennsylvania.
| |
Collapse
|
45
|
Pathophysiology of sepsis-related cardiac dysfunction: driven by inflammation, energy mismanagement, or both? Curr Heart Fail Rep 2015; 12:130-40. [PMID: 25475180 DOI: 10.1007/s11897-014-0247-z] [Citation(s) in RCA: 142] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Sepsis is a systemic inflammatory response that follows bacterial infection. Cardiac dysfunction is an important consequence of sepsis that affects mortality and has been attributed to either elevated inflammation or suppression of both fatty acid and glucose oxidation and eventual ATP depletion. Moreover, cardiac adrenergic signaling is compromised in septic patients and this aggravates further heart function. While anti-inflammatory therapies are important for the treatment of the disease, administration of anti-inflammatory drugs did not improve survival in septic patients. This review article summarizes findings on inflammatory and other mechanisms that are triggered in sepsis and affect cardiac function and mortality. Particularly, it focuses on the effects of the disease in metabolic pathways, as well as in adrenergic signaling and the potential interplay of the latter with inflammation. It is suggested that therapeutic approaches should include combination of anti-inflammatory treatments, stimulation of energy production, and restoration of adrenergic signaling in the heart.
Collapse
|
46
|
Fedotcheva NI, Litvinova EG, Osipov AA, Olenin AY, Moroz VV, Beloborodova NV. The effects of phenolic microbial metabolites on the activities of mitochondrial enzymes. Biophysics (Nagoya-shi) 2015. [DOI: 10.1134/s0006350915060068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
|
47
|
Srivastava A, McGinniss J, Wong Y, Shinn AS, Lam TT, Lee PJ, Mannam P. MKK3 deletion improves mitochondrial quality. Free Radic Biol Med 2015; 87:373-84. [PMID: 26119780 DOI: 10.1016/j.freeradbiomed.2015.06.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 05/18/2015] [Accepted: 06/14/2015] [Indexed: 11/23/2022]
Abstract
Sepsis, a severe response to infection, leads to excessive inflammation and is the major cause of mortality in intensive care units. Mitochondria have been shown to influence the outcome of septic injury. We have previously shown that MAP kinase kinase 3 (MKK3)(-/-) mice are resistant to septic injury and MKK3(-/-) macrophages have improved mitochondrial function. In this study we examined processes that lead to improved mitochondrial quality in MKK3(-/-) mouse embryonic fibroblasts (MEFs) and specifically the role of mitophagy in mitochondrial health. MKK3(-/-) MEFs had lower inflammatory cytokine release and oxidant production after lipopolysaccharide (LPS) stimulation, confirming our earlier observations. MKK3(-/-) MEFs had better mitochondrial function as measured by mitochondrial membrane potential (MMP) and ATP, even after LPS treatment. We observed higher mitophagy in MKK3(-/-) MEFs compared to wild type (WT). Transmission electron microscopy studies showed longer and larger mitochondria in MKK3(-/-) MEFs, indicative of healthier mitochondria. We performed a SILAC (stable isotope labeling by/with amino acids in cell culture) study to assess differences in mitochondrial proteome between WT and MKK3(-/-) MEFs and observed increased expression of tricarboxylic acid (TCA) cycle enzymes and respiratory complex subunits. Further, inhibition of mitophagy by Mdivi1 led to loss in MMP and increased cytokine secretion after LPS treatment in MKK3(-/-) MEFs. In conclusion, this study demonstrates that MKK3 influences mitochondrial quality by affecting the expression of mitochondrial proteins, including TCA cycle enzymes, and mitophagy, which consequently regulates the inflammatory response. Based on our results, MKK3 could be a potential therapeutic target for inflammatory diseases like sepsis.
Collapse
Affiliation(s)
- Anup Srivastava
- Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520-8057, USA
| | - John McGinniss
- Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520-8057, USA
| | - Yao Wong
- Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520-8057, USA
| | - Amanda S Shinn
- Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520-8057, USA
| | - TuKiet T Lam
- Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520-8057, USA; W.M. Keck Foundation Biotechnology Resource Laboratory, Yale University School of Medicine, New Haven, CT 06511, USA
| | - Patty J Lee
- Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520-8057, USA
| | - Praveen Mannam
- Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520-8057, USA.
| |
Collapse
|
48
|
|
49
|
Wu Y, Xia P, Zheng C. Bioinformatics analysis of transcription profiling of sepsis. EUR J INFLAMM 2015. [DOI: 10.1177/1721727x15590946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Sepsis is a fatal whole-body inflammatory response that complicates a serious infection. To elucidate the molecular mechanism of sepsis, transcription profile data of GSE12624 which included a total of 70 samples (34 sepsis samples and 36 non-sepsis samples) was downloaded. The t test based on Bayes method in limma package was used to identify differentially expressed genes (DEGs) between sepsis and non-sepsis samples (criterion: P value <0.05). Gene Ontology (GO) enrichment analysis was conducted to investigate the biological processes involved DEGs. Protein-protein interaction (PPI) network and sub-network analysis were conducted to investigate the interactions between DEGs. A total of 894 DEGs, including 479 downregulated DEGs and 415 upregulated DEGs, were identified in sepsis samples comparing with non-sepsis samples. GO enrichment analysis showed that DEGs mainly involved in cellular metabolic process, primary metabolic process, and response to organic cyclic compound. In the PPI network, four genes of CDC2, GTF2F2, PCNA, and SMAD4 with degrees more than 10 were identified. Subsequently, four sub-networks, in which genes of PTBP1, PSMA3, PSMA6, PSMB9, PSMB10, and GADD45 had relative high degrees were identified from the PPI network. After the discussion referring to previous studies, we suggested that CDC2, GTF2F2, PCNA, SMAD4 PSMA3, PTBP1, and GADD45 might be used as new therapeutic targets for sepsis. However, experiments should be further performed to prove the practical utility of these candidates.
Collapse
Affiliation(s)
- Yanfeng Wu
- The Department of Respiratory Medicine, the Second Hospital of Jilin University, Changchun 130041, PR China
| | - Peng Xia
- The Department of Respiratory Medicine, the Second Hospital of Jilin University, Changchun 130041, PR China
| | - Changjun Zheng
- The Department of Respiratory Medicine, the Second Hospital of Jilin University, Changchun 130041, PR China
| |
Collapse
|
50
|
Lyu J, Zheng G, Chen Z, Wang B, Tao S, Xiang D, Xie M, Huang J, Liu C, Zeng Q. Sepsis-induced brain mitochondrial dysfunction is associated with altered mitochondrial Src and PTP1B levels. Brain Res 2015; 1620:130-8. [PMID: 25998537 DOI: 10.1016/j.brainres.2015.04.062] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 04/24/2015] [Indexed: 10/23/2022]
Abstract
Sepsis-induced brain dysfunction (SIBD) is often the first manifestation of sepsis, and its pathogenesis is associated with mitochondrial dysfunction. In this study, we investigated the roles of the tyrosine kinase Src and protein tyrosine phosphatase 1B (PTP1B) in brain mitochondrial dysfunction using a rat model of lipopolysaccharide (LPS)-induced sepsis. We found that there was a gradual and significant increase of PTP1B levels in the rat brain after sepsis induction. In contrast, brain Src levels were reduced in parallel with the PTP1B increase. Sepsis led to significantly reduced tyrosine phosphorylation of mitochondrial oxidative phosphorylation (OXPHOS) complexes I, II and III. Pretreatment of mitochondrial proteins with active PTP1B significantly inhibited complexes I and III activities in vitro, whereas Src enhanced complexes I, II, and III activities. PTP1B and Src were each co-immunoprecipitated with OXPHOS complexes I and III, suggesting direct interactions between both proteins and complexes I and III. Src also directly interacted with complex II. Furthermore, pretreatment of mitochondrial proteins with active PTP1B resulted in overproduction of reactive oxygen species and decreased mitochondrial membrane potential. Pretreatment with active Src produced the opposite effect. These results suggest that brain mitochondrial dysfunction following LPS-induced sepsis in rats is partly attributed to PTP1B and Src mediated decrease in mitochondrial protein tyrosine phosphorylation.
Collapse
Affiliation(s)
- Juanjuan Lyu
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Guilang Zheng
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Zhijiang Chen
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Bin Wang
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Shaohua Tao
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Dan Xiang
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Meiyan Xie
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Jinda Huang
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Cui Liu
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China
| | - Qiyi Zeng
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, Guangdong Province, China.
| |
Collapse
|