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Feng A, Su S, Li C, Kang Y, Qiu J, Zhou J. Berberine decreases S100B generation to regulate gut vascular barrier permeability in mice with burn injury. PHARMACEUTICAL BIOLOGY 2024; 62:53-61. [PMID: 38108311 PMCID: PMC10732204 DOI: 10.1080/13880209.2023.2291679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 12/01/2023] [Indexed: 12/19/2023]
Abstract
Context: Berberine (BBR) can regulate enteric glial cells (EGCs) and the gut vascular barrier (GVB).Objective: To explore whether BBR regulates GVB permeability via the S100B pathway.Materials and methods: GVB hyperpermeability in C57BL/6J mice was induced by burns or S100B enema. BBR (25 or 50 mg/kg/d, 3 d) was gavaged preburn. S100B monoclonal antibody (S100BmAb) was i.v. injected postburn. Mouse intestinal microvascular endothelial cells (MIMECs) were treated with S100B, S100B plus BBR, or Z-IETD-FMK. GVB permeability was assayed by FITC-dextran, S100B by ELISA, caspase-8, β-catenin, occludin and PV-1 by immunoblot.Results: Burns elevated S100B in serum and in colonic mucosa to a peak (147.00 ± 4.95 ng/mL and 160.30 ± 8.50 ng/mg, respectively) at 36 h postburn, but BBR decreased burns-induced S100B in serum (126.20 ± 6.30 or 90.60 ± 3.78 ng/mL) and in mucosa (125.80 ± 12.40 or 91.20 ± 8.54 ng/mg). Burns raised GVB permeability (serum FITC-dextran 111.40 ± 8.56 pg/mL) at 48 h postburn, but BBR reduced GVB permeability (serum FITC-dextran 89.20 ± 6.98 or 68.60 ± 5.50 ng/mL). S100B enema (1 μM) aggravated burns-raised GVB permeability (142.80 ± 8.07 pg/mL) and PV-1, but the effect of S100B was antagonized by BBR. Z-IETD-FMK (5 μM) increased S100B-induced permeability to FITC-dextran (205.80 ± 9.70 to 263.80 ± 11.04 AUs) while reducing β-catenin in MIMECs. BBR (5 μM) reduced S100B-induced permeability (104.20 ± 9.65 AUs) and increased caspase-8, β-catenin and occludin.Discussion and conclusion: BBR decreases burns-induced GVB hyperpermeability via modulating S100B/caspase-8/β-catenin pathway and may involve EGCs.
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Affiliation(s)
- Aiwen Feng
- Department of General Surgery, Maoming People’s Hospital, Guangdong Medical University, China
- Department of General Surgery, Maoming People’s Hospital, Southern Medical University, China
| | - Shaosheng Su
- Department of General Surgery, Maoming People’s Hospital, Guangdong Medical University, China
| | - Cheng Li
- Department of General Surgery, Maoming People’s Hospital, Southern Medical University, China
| | - Yutian Kang
- Department of Burn and Plastic Surgery, Maoming People’s Hospital, Southern Medical University, China
| | - Jiasheng Qiu
- Department of General Surgery, Maoming People’s Hospital, Guangdong Medical University, China
- Department of General Surgery, Maoming People’s Hospital, Southern Medical University, China
| | - Jun Zhou
- Department of General Surgery, Maoming People’s Hospital, Guangdong Medical University, China
- Department of General Surgery, Maoming People’s Hospital, Southern Medical University, China
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Prabhakaran HS, Hu D, He W, Luo G, Liou YC. Mitochondrial dysfunction and mitophagy: crucial players in burn trauma and wound healing. BURNS & TRAUMA 2023; 11:tkad029. [PMID: 37465279 PMCID: PMC10350398 DOI: 10.1093/burnst/tkad029] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 03/10/2023] [Accepted: 04/28/2023] [Indexed: 07/20/2023]
Abstract
Burn injuries are a significant cause of death worldwide, leading to systemic inflammation, multiple organ failure and sepsis. The progression of burn injury is explicitly correlated with mitochondrial homeostasis, which is disrupted by the hyperinflammation induced by burn injury, leading to mitochondrial dysfunction and cell death. Mitophagy plays a crucial role in maintaining cellular homeostasis by selectively removing damaged mitochondria. A growing body of evidence from various disease models suggest that pharmacological interventions targeting mitophagy could be a promising therapeutic strategy. Recent studies have shown that mitophagy plays a crucial role in wound healing and burn injury. Furthermore, chemicals targeting mitophagy have also been shown to improve wound recovery, highlighting the potential for novel therapeutic strategies based on an in-depth exploration of the molecular mechanisms regulating mitophagy and its association with skin wound healing.
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Affiliation(s)
- Harshini Sheeja Prabhakaran
- Department of Biological Sciences, Faculty of Science, National University of Singapore, 14 Science drive 4, 117543 Singapore, Singapore
| | - Dongxue Hu
- Department of Biological Sciences, Faculty of Science, National University of Singapore, 14 Science drive 4, 117543 Singapore, Singapore
| | - Weifeng He
- State Key Laboratory of Trauma, Burn and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical University (Army Medical University), Gao Tan Yan Zheng Street, Sha Ping Ba District, Chongqing, 400038, People's Republic of China
- Chongqing Key Laboratory for Disease Proteomics, Gao Tan Yan Zheng Street, Sha Ping Ba District, Chongqing, 400038, People's Republic of China
| | - Gaoxing Luo
- State Key Laboratory of Trauma, Burn and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical University (Army Medical University), Gao Tan Yan Zheng Street, Sha Ping Ba District, Chongqing, 400038, People's Republic of China
- Chongqing Key Laboratory for Disease Proteomics, Gao Tan Yan Zheng Street, Sha Ping Ba District, Chongqing, 400038, People's Republic of China
| | - Yih-Cherng Liou
- Department of Biological Sciences, Faculty of Science, National University of Singapore, 14 Science drive 4, 117543 Singapore, Singapore
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Kim M, Nikouee A, Zou R, Ren D, He Z, Li J, Wang L, Djukovic D, Raftery D, Purcell H, Promislow D, Sun Y, Goodarzi M, Zhang Q, Liu Z, Zang QS. Age-Independent Cardiac Protection by Pharmacological Activation of Beclin-1 During Endotoxemia and Its Association With Energy Metabolic Reprograming in Myocardium-A Targeted Metabolomics Study. J Am Heart Assoc 2022; 11:e025310. [PMID: 35861821 PMCID: PMC9707816 DOI: 10.1161/jaha.122.025310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 06/02/2022] [Indexed: 11/16/2022]
Abstract
Background We showed that Beclin-1-dependent autophagy protects the heart in young and adult mice that underwent endotoxemia. Herein, we compared the potential therapeutic effects of Beclin-1 activating peptide, TB-peptide, on endotoxemia-induced cardiac outcomes in young adult and aged mice. We further evaluated lipopolysaccharide (lipopolysaccharide)-induced and TB-peptide treatment-mediated alterations in myocardial metabolism. Methods and Results C57BL/6J mice that were 10 weeks and 24 months old were challenged by lipopolysaccharide using doses at which cardiac dysfunction occurred. Following the treatment of TB-peptide or control vehicle, heart contractility, circulating cytokines, and myocardial autophagy were evaluated. We detected that TB-peptide boosted autophagy, attenuated cytokines, and improved cardiac performance in both young and aged mice during endotoxemia. A targeted metabolomics assay was designed to detect a pool of 361 known metabolites, of which 156 were detected in at least 1 of the heart tissue samples. Lipopolysaccharide-induced impairments were found in glucose and amino acid metabolisms in mice of all ages, and TB-peptide ameliorated these alterations. However, lipid metabolites were upregulated in the young group but moderately downregulated in the aged by lipopolysaccharide, suggesting an age-dependent response. TB-peptide mitigated lipopolysaccharide-mediated trend of lipids in the young mice but had little effect on the aged. (Study registration: Project DOI: https://doi.org/10.21228/M8K11W). Conclusions Pharmacological activation of Beclin-1 by TB-peptide is cardiac protective in both young and aged population during endotoxemia, suggest a therapeutic potential for sepsis-induced cardiomyopathy. Metabolomics analysis suggests that an age-independent protection by TB-peptide is associated with reprograming of energy production via glucose and amino acid metabolisms.
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Affiliation(s)
- Matthew Kim
- Department of Surgery, Burn & Shock Trauma Research InstituteLoyola University Chicago Stritch School of MedicineMaywoodIL
| | - Azadeh Nikouee
- Department of Surgery, Burn & Shock Trauma Research InstituteLoyola University Chicago Stritch School of MedicineMaywoodIL
| | - Raymond Zou
- Department of Biological SciencesRice UniversityHoustonTX
| | - Di Ren
- Department of SurgeryUniversity of South FloridaTampaFL
| | - Zhibin He
- Department of SurgeryUniversity of South FloridaTampaFL
| | - Ji Li
- Department of SurgeryUniversity of South FloridaTampaFL
| | - Lu Wang
- Department of Environmental and Occupational Health SciencesUniversity of WashingtonSeattleWA
| | - Danijel Djukovic
- Department of Anesthesiology and Pain Medicine, Northwest Metabolomics Research CenterUniversity of WashingtonSeattleWA
| | - Daniel Raftery
- Department of Anesthesiology and Pain Medicine, Northwest Metabolomics Research CenterUniversity of WashingtonSeattleWA
| | - Hayley Purcell
- Department of Anesthesiology and Pain Medicine, Northwest Metabolomics Research CenterUniversity of WashingtonSeattleWA
| | - Daniel Promislow
- Department of Lab Medicine & PathologyUniversity of Washington School of MedicineSeattleWA
- Department of BiologyUniversity of Washington School of MedicineSeattleWA
| | - Yuxiao Sun
- Department of SurgeryUniversity of Texas Southwestern Medical CenterDallasTX
| | - Mohammad Goodarzi
- Department of ImmunologyUniversity of Texas Southwestern Medical CenterDallasTX
| | - Qing‐Jun Zhang
- Cardiology Division, Department of Internal MedicineUniversity of Texas Southwestern Medical CenterDallasTX
| | - Zhi‐Ping Liu
- Cardiology Division, Department of Internal MedicineUniversity of Texas Southwestern Medical CenterDallasTX
| | - Qun Sophia Zang
- Department of Surgery, Burn & Shock Trauma Research InstituteLoyola University Chicago Stritch School of MedicineMaywoodIL
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Peng Y, Wang L, Zhao X, Lai S, He X, Fan Q, He H, He M. Puerarin attenuates lipopolysaccharide-induced myocardial injury via the 14-3-3γ/PKCε pathway activating adaptive autophagy. Int Immunopharmacol 2022; 108:108905. [DOI: 10.1016/j.intimp.2022.108905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 05/18/2022] [Accepted: 05/24/2022] [Indexed: 12/30/2022]
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Catalpol Protects ARPE-19 Cells against Oxidative Stress via Activation of the Keap1/Nrf2/ARE Pathway. Cells 2021; 10:cells10102635. [PMID: 34685615 PMCID: PMC8534470 DOI: 10.3390/cells10102635] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 09/28/2021] [Accepted: 09/30/2021] [Indexed: 02/07/2023] Open
Abstract
Oxidative damage to retinal pigment epithelial (RPE) has been identified as one of the major regulatory factors in the pathogenesis of age-related macular degeneration (AMD). Catalpol is an iridoid glucoside compound that has been found to possess potential antioxidant activity. In the present study, we aimed to investigate the protective effect of catalpol on RPE cells under oxidative stress and to elucidate the potential molecular mechanism involved. We found that catalpol significantly attenuated hydrogen peroxide (H2O2)-induced cytotoxicity, G0/G1 phase cell cycle arrest, and apoptosis in RPE cells. The overproduction of reactive oxygen species (ROS) and malondialdehyde (MDA) stimulated by oxidative stress and the corresponding reductions in antioxidant glutathione (GSH) and superoxide dismutase (SOD) levels were largely reversed by catalpol pretreatment. Moreover, catalpol pretreatment markedly activated the expression of nuclear factor (erythroid-derived 2)-like 2 (Nrf2) and its downstream antioxidant enzymes, catalase (CAT), heme oxygenase-1 (HO-1), and NADPH dehydrogenase (NQO1). It also increased the expression levels of cyclin E, Bcl-2, cyclin A, and cyclin-dependent kinase 2 (CDK2) and decreased the expression levels of Bax, Fas, cleaved PARP, p-p53, and p21 cleaved caspase-3, 8, and 9. The oxidative stress-induced formation of the Keap1/Nrf2 complex in the cytoplasm was significantly blocked by catalpol pretreatment. These results indicate that catalpol protected RPE cells from oxidative stress through a mechanism involving the activation of the Keap1/Nrf2/ARE pathways and the inactivation of oxidative stress-mediated pathways of apoptosis.
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Qiao Y, Wang L, Hu T, Yin D, He H, He M. Capsaicin protects cardiomyocytes against lipopolysaccharide-induced damage via 14-3-3γ-mediated autophagy augmentation. Front Pharmacol 2021; 12:659015. [PMID: 33986684 PMCID: PMC8111444 DOI: 10.3389/fphar.2021.659015] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 03/30/2021] [Indexed: 12/16/2022] Open
Abstract
Background: The myocardium is susceptible to lipopolysaccharide (LPS)-induced damage in sepsis, and cardiac dysfunction is a leading cause of mortality in patients with sepsis. The changes in cardiomyocyte autophagy in sepsis and the effects and mechanism of action of capsaicin (Cap) remain unclear. Methods and Results: The potential pathway of 14-3-3γ-dependent autophagy and the effects and mechanisms of Cap were studied in LPS-induced injury to primary cultured neonatal rat cardiomyocytes. The results showed that cardiomyocyte viability decreased, lactate dehydrogenase and creatine kinase activities increased, 14-3-3γ expression was downregulated, and autophagy was inhibited after LPS challenge. Cap pretreatment augmented autophagy by upregulating 14-3-3γ expression and activating AMP-activated protein kinase (AMPK) and unc-51 like autophagy-activating kinase 1 (ULK1), suppressing mammalian target of rapamycin (mTOR), alleviating cardiac dysfunction and improving the inflammation response, whereas pAD/14-3-3γ-shRNA nullified the above effects. Cap pretreatment also decreased the levels of IL-1β, TNF-α, IL-6, and IL-10; suppressed intracellular oxidative stress; reduced the intracellular/mitochondrial reactive oxygen species (ROS); balanced GSH/GSSG; increased GSH-Px, catalase, and SOD activities; and decreased MDA contents. It also increased ATP content, activated complex Ⅰ and complex Ⅲ, stabilized the mitochondrial membrane potential, and decreased the mitochondrial permeability transition pore opening, thereby improving mitochondrial function. Conclusion: Pretreatment with Cap can regulate autophagy by upregulating 14-3-3γ expression, inhibiting oxidative stress and inflammation, maintaining mitochondrial function, and protecting cardiomyocytes against LPS-induced injury.
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Affiliation(s)
- Yang Qiao
- Institute of Cardiovascular Diseases, Jiangxi Academy of Clinical Medical Sciences, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Liang Wang
- Department of Rehabilitation, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Tianhong Hu
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University School of Pharmaceutical Science, Nanchang, China
| | - Dong Yin
- Jiangxi Provincial Key Laboratory of Molecular Medicine, The Second Affiliated Hospital, Nanchang University, Nanchang, China
| | - Huan He
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University School of Pharmaceutical Science, Nanchang, China
| | - Ming He
- Institute of Cardiovascular Diseases, Jiangxi Academy of Clinical Medical Sciences, The First Affiliated Hospital of Nanchang University, Nanchang, China
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7
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Wang M, Scott SR, Koniaris LG, Zimmers TA. Pathological Responses of Cardiac Mitochondria to Burn Trauma. Int J Mol Sci 2020; 21:ijms21186655. [PMID: 32932869 PMCID: PMC7554938 DOI: 10.3390/ijms21186655] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 09/04/2020] [Accepted: 09/08/2020] [Indexed: 12/18/2022] Open
Abstract
Despite advances in treatment and care, burn trauma remains the fourth most common type of traumatic injury. Burn-induced cardiac failure is a key factor for patient mortality, especially during the initial post-burn period (the first 24 to 48 h). Mitochondria, among the most important subcellular organelles in cardiomyocytes, are a central player in determining the severity of myocardial damage. Defects in mitochondrial function and structure are involved in pathogenesis of numerous myocardial injuries and cardiovascular diseases. In this article, we comprehensively review the current findings on cardiac mitochondrial pathological changes and summarize burn-impaired mitochondrial respiration capacity and energy supply, induced mitochondrial oxidative stress, and increased cell death. The molecular mechanisms underlying these alterations are discussed, along with the possible influence of other biological variables. We hope this review will provide useful information to explore potential therapeutic approaches that target mitochondria for cardiac protection following burn injury.
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Affiliation(s)
- Meijing Wang
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA; (S.R.S.); (L.G.K.); (T.A.Z.)
- Correspondence:
| | - Susan R. Scott
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA; (S.R.S.); (L.G.K.); (T.A.Z.)
| | - Leonidas G. Koniaris
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA; (S.R.S.); (L.G.K.); (T.A.Z.)
- Simon Cancer Center, Indiana University, Indianapolis, IN 46202, USA
- Indiana Center for Musculoskeletal Health, Indianopolis, IN 46202, USA
- Center for Cachexia Research Innovation and Therapy, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Teresa A. Zimmers
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA; (S.R.S.); (L.G.K.); (T.A.Z.)
- Simon Cancer Center, Indiana University, Indianapolis, IN 46202, USA
- Indiana Center for Musculoskeletal Health, Indianopolis, IN 46202, USA
- Center for Cachexia Research Innovation and Therapy, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA
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Chen M, Guan Y, Li A, Zhao YZ, Zhang L, Zhang L, Gong Y. LncRNA SOX2OT Mediates Mitochondrial Dysfunction in Septic Cardiomyopathy. DNA Cell Biol 2019; 38:1197-1206. [PMID: 31618067 DOI: 10.1089/dna.2019.4839] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Researches establish an indispensable role of mitochondrial dysfunction in septic cardiomyopathy. We aimed to investigate the effects of long noncoding RNA (LncRNA) SOX2 overlapping transcript (SOX2OT) on mitochondrial dysfunction in septic cardiomyopathy. We observed an obvious overexpression of SOX2OT in septic hearts and cardiomyocytes. Knockdown of SOX2OT in mice recovered the reduced cardiac function, and improved the mitochondrial membrane potential impaired by lipopolysaccharide (LPS). SOX2OT overexpressed mice showed the opposite situation. In parallel, knockdown of SOX2OT in cardiomyocytes restored the mitochondrial membrane potential, along with reduced mitochondrial reactive oxygen species production induced by LPS, while overexpression of SOX2OT reversed these effects. Mechanistically, SOX2OT could regulate mitochondrial dysfunction in septic cardiomyopathy via SOX2. In general, SOX2OT contributed to mitochondrial dysfunction progression via inhibiting SOX2 expression in septic cardiomyopathy, which may provide a new insight for treatment of septic cardiomyopathy.
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Affiliation(s)
- Mengfei Chen
- Department of Emergency, People's Hospital of Ningxia Hui Autonomous Region (The First Affiliated Hospital of Northwest Minzu University), Ningxia, China
| | - Yan Guan
- Department of Emergency, People's Hospital of Ningxia Hui Autonomous Region (The First Affiliated Hospital of Northwest Minzu University), Ningxia, China
| | - Ao Li
- Medical College of Northwest Minzu University, Lanzhou, China
| | - Ying-Zhu Zhao
- People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi, China
| | - Ling Zhang
- Department of Emergency, People's Hospital of Ningxia Hui Autonomous Region (The First Affiliated Hospital of Northwest Minzu University), Ningxia, China
| | - Liang Zhang
- Department of Emergency, People's Hospital of Ningxia Hui Autonomous Region (The First Affiliated Hospital of Northwest Minzu University), Ningxia, China
| | - Yanxuan Gong
- Department of Geratology, Lanzhou University, Lanzhou, China.,Department of Geratology, Gansu Second Provincial Hospital, Lanzhou, China.,Xi'An International University, Xi'An, China
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Sun Y, Yao X, Zhang QJ, Zhu M, Liu ZP, Ci B, Xie Y, Carlson D, Rothermel BA, Sun Y, Levine B, Hill JA, Wolf SE, Minei JP, Zang QS. Beclin-1-Dependent Autophagy Protects the Heart During Sepsis. Circulation 2019; 138:2247-2262. [PMID: 29853517 DOI: 10.1161/circulationaha.117.032821] [Citation(s) in RCA: 265] [Impact Index Per Article: 53.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND Cardiac dysfunction is a major component of sepsis-induced multiorgan failure in critical care units. Changes in cardiac autophagy and its role during sepsis pathogenesis have not been clearly defined. Targeted autophagy-based therapeutic approaches for sepsis are not yet developed. METHODS Beclin-1-dependent autophagy in the heart during sepsis and the potential therapeutic benefit of targeting this pathway were investigated in a mouse model of lipopolysaccharide (LPS)-induced sepsis. RESULTS LPS induced a dose-dependent increase in autophagy at low doses, followed by a decline that was in conjunction with mammalian target of rapamycin activation at high doses. Cardiac-specific overexpression of Beclin-1 promoted autophagy, suppressed mammalian target of rapamycin signaling, improved cardiac function, and alleviated inflammation and fibrosis after LPS challenge. Haplosufficiency for beclin 1 resulted in opposite effects. Beclin-1 also protected mitochondria, reduced the release of mitochondrial danger-associated molecular patterns, and promoted mitophagy via PTEN-induced putative kinase 1-Parkin but not adaptor proteins in response to LPS. Injection of a cell-permeable Tat-Beclin-1 peptide to activate autophagy improved cardiac function, attenuated inflammation, and rescued the phenotypes caused by beclin 1 deficiency in LPS-challenged mice. CONCLUSIONS These results suggest that Beclin-1 protects the heart during sepsis and that the targeted induction of Beclin-1 signaling may have important therapeutic potential.
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Affiliation(s)
- Yuxiao Sun
- Departments of Surgery (Y.S., X.Y., D.C., S.E.W., J.P.M., Q.S.Z.), University of Texas Southwestern Medical Center, Dallas
| | - Xiao Yao
- Departments of Surgery (Y.S., X.Y., D.C., S.E.W., J.P.M., Q.S.Z.), University of Texas Southwestern Medical Center, Dallas
| | - Qing-Jun Zhang
- Internal Medicine, Cardiology Division (Q.-J.Z., M.Z., Z.-P.L., B.A.R., J.A.H.), University of Texas Southwestern Medical Center, Dallas
| | - Min Zhu
- Internal Medicine, Cardiology Division (Q.-J.Z., M.Z., Z.-P.L., B.A.R., J.A.H.), University of Texas Southwestern Medical Center, Dallas
| | - Zhi-Ping Liu
- Internal Medicine, Cardiology Division (Q.-J.Z., M.Z., Z.-P.L., B.A.R., J.A.H.), University of Texas Southwestern Medical Center, Dallas
| | - Bo Ci
- Clinical Science, Quantitative Biomedical Research Center (B.C., Y.X.), University of Texas Southwestern Medical Center, Dallas
| | - Yang Xie
- Clinical Science, Quantitative Biomedical Research Center (B.C., Y.X.), University of Texas Southwestern Medical Center, Dallas
| | - Deborah Carlson
- Departments of Surgery (Y.S., X.Y., D.C., S.E.W., J.P.M., Q.S.Z.), University of Texas Southwestern Medical Center, Dallas
| | - Beverly A Rothermel
- Internal Medicine, Cardiology Division (Q.-J.Z., M.Z., Z.-P.L., B.A.R., J.A.H.), University of Texas Southwestern Medical Center, Dallas
| | - Yuxiang Sun
- Department of Nutrition and Food Science, Texas A&M University, College Station (Y.S.)
| | - Beth Levine
- Internal Medicine, Center for Autophagy Research, Howard Hughes Medical Institute (B.L.), University of Texas Southwestern Medical Center, Dallas
| | - Joseph A Hill
- Internal Medicine, Cardiology Division (Q.-J.Z., M.Z., Z.-P.L., B.A.R., J.A.H.), University of Texas Southwestern Medical Center, Dallas
| | - Steven E Wolf
- Departments of Surgery (Y.S., X.Y., D.C., S.E.W., J.P.M., Q.S.Z.), University of Texas Southwestern Medical Center, Dallas
| | - Joseph P Minei
- Departments of Surgery (Y.S., X.Y., D.C., S.E.W., J.P.M., Q.S.Z.), University of Texas Southwestern Medical Center, Dallas
| | - Qun S Zang
- Departments of Surgery (Y.S., X.Y., D.C., S.E.W., J.P.M., Q.S.Z.), University of Texas Southwestern Medical Center, Dallas
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Sun Y, Cai Y, Zang QS. Cardiac Autophagy in Sepsis. Cells 2019; 8:cells8020141. [PMID: 30744190 PMCID: PMC6406743 DOI: 10.3390/cells8020141] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 02/02/2019] [Accepted: 02/05/2019] [Indexed: 02/06/2023] Open
Abstract
Sepsis is a leading cause of death in intensive care units, and cardiac dysfunction is an identified serious component of the multi-organ failure associated with this critical condition. This review summarized the current discoveries and hypotheses of how autophagy changes in the heart during sepsis and the underlying mechanisms. Recent investigations suggest that specific activation of autophagy initiation factor Beclin-1 has a potential to protect cardiac mitochondria, attenuate inflammation, and improve cardiac function in sepsis. Accordingly, pharmacological interventions targeting this pathway have a potential to become an effective approach to control sepsis outcomes. The role of autophagy during sepsis pathogenesis has been under intensive investigation in recent years. It is expected that developing therapeutic approaches with specificities targeting at autophagy regulatory factors may provide new opportunities to alleviate organ dysfunction caused by maladaptive autophagy during sepsis.
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Affiliation(s)
- Yuxiao Sun
- Departments of Surgery, University of Texas Southwestern Medical Center, 75390 Dallas, TX, USA.
| | - Ying Cai
- Department of Developmental Cell Biology, School of Life Sciences, China Medical University, 77 Puhe Road, Shenbei New District, 110122 Shenyang, China.
| | - Qun S Zang
- Departments of Surgery, University of Texas Southwestern Medical Center, 75390 Dallas, TX, USA.
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Yin S, Jiang B, Huang G, Gong Y, You B, Yang Z, Chen Y, Chen J, Yuan Z, Li M, Hu F, Zhao Y, Peng Y. Burn Serum Increases Staphylococcus aureus Biofilm Formation via Oxidative Stress. Front Microbiol 2017; 8:1191. [PMID: 28702016 PMCID: PMC5487419 DOI: 10.3389/fmicb.2017.01191] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 06/12/2017] [Indexed: 12/22/2022] Open
Abstract
Staphylococcus aureus is a common pathogen isolated from burn patients that can form biofilms on burn wounds and implanted deep vein catheters, which often leads to refractory infections or even biofilm-related sepsis. As biofilm formation is usually regulated by environmental conditions, we hypothesized that serum composition may be altered after burn injury, potentially affecting the ability of infecting bacteria to form biofilms. As predicted, we observed that serum from burn-injured rats increases biofilm formation by S. aureus and also induces bacterial aggregation and adherence to human fibronectin and fibrinogen. Analysis of potential regulatory factors revealed that exposure to burn serum decreases expression of the quorum-sensing agr system and increases mRNA levels of some biofilm inducers such as sarA and icaA. In addition, we also observed that burn serum imposes oxidative stress and increases expression of key oxidoreductase genes (sodA, sodM, katA, and ahpC) in S. aureus. Importantly, the ability of burn serum to enhance biofilm formation and bacterial cell aggregation can be abrogated by treatment with an antioxidant. Taken together, these findings indicate that burn serum increases S. aureus biofilm formation via elevated oxidative stress, and may lead to novel strategies to control biofilm formation and infection in burn patients.
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Affiliation(s)
- Supeng Yin
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
| | - Bei Jiang
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
| | - Guangtao Huang
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
| | - Yali Gong
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
| | - Bo You
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
| | - Zichen Yang
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
| | - Yu Chen
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
| | - Jing Chen
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
| | - Zhiqiang Yuan
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
| | - Ming Li
- Department of Microbiology, Third Military Medical UniversityChongqing, China
| | - Fuquan Hu
- Department of Microbiology, Third Military Medical UniversityChongqing, China
| | - Yan Zhao
- Department of Microbiology, Third Military Medical UniversityChongqing, China
| | - Yizhi Peng
- State Key Laboratory of Trauma, Burns, and Combined Injury, Institute of Burn Research, Southwest Hospital, Third Military Medical UniversityChongqing, China
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Ahmad A, Szabo C. Both the H 2S biosynthesis inhibitor aminooxyacetic acid and the mitochondrially targeted H 2S donor AP39 exert protective effects in a mouse model of burn injury. Pharmacol Res 2016; 113:348-355. [PMID: 27639598 DOI: 10.1016/j.phrs.2016.09.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 07/31/2016] [Accepted: 09/14/2016] [Indexed: 12/19/2022]
Abstract
Hydrogen sulfide (H2S) exerts beneficial as well as deleterious effects in various models of critical illness. Here we tested the effect of two different pharmacological interventions: (a) inhibition of H2S biosynthesis using the cystathionine-beta-synthase (CBS)/cystathionine-gamma-lyase (CSE) inhibitor aminooxyacetic acid (AOAA) and the mitochondrially targeted H2S donor [10-oxo-10-[4-(3-thioxo-3H-1,2-dithiol-5-yl)phenoxy]decyl]triphenyl-phosphonium (AP39). A 30% body surface area burn injury was induced in anesthetized mice; animals were treated with vehicle, AOAA (10mg/kg i.p. once or once a day for 6days), or AP39 (0.3mg/kg/day once or once a day for 6days). In two separate groups, animals were sacrificed, at 24h post-burn or on Day 7 post-burn, blood and lungs were collected and the following parameters were evaluated: myeloperoxidase (MPO) and malondialdehyde (MDA) in lung homogenates, plasma cytokines (Luminex analysis) and circulating indicators of organ dysfunction (Vetscan analysis). Lung MPO levels (an index of neutrophil infiltration) and MDA levels (an index of oxidative stress) were significantly increased in response to burn injury both at 24h and at 7days; both AOAA and AP39 attenuated these increases. From a panel of inflammatory cytokines (TNFα, IL-1β, IL-6, IL-10, MCP-1, MIP-2, VEGF and IFNγ) in the plasma, IL-6 and IL-10 levels were markedly elevated at 24h and VEGF was slightly elevated. IL-6 remained highly elevated at 7days post-burn while IL-10 levels decreased, but remained slightly elevated over baseline 7days post-burn. The changes in cytokine levels were attenuated both by AP39 and AOAA at both time points studied. The burn-induced increases in the organ injury markers ALP and ALT, amylase and creatinine were reduced by both AOAA and AP39. We conclude that both H2S biosynthesis inhibition (using AOAA) and H2S donation (using AP39) suppresses inflammatory mediator production and reduces multi-organ injury in a murine model of burn injury, both at an early time point (when systemic H2S levels are elevated) and at a later time point (at which time systemic H2S levels have returned to baseline). These findings point to the complex pathogenetic role of H2S in burns.
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Affiliation(s)
- Akbar Ahmad
- Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX, USA; Shriners Hospitals for Children, Galveston, TX, USA
| | - Csaba Szabo
- Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX, USA; Shriners Hospitals for Children, Galveston, TX, USA.
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13
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Mannic T, Satta N, Pagano S, Python M, Virzi J, Montecucco F, Frias MA, James RW, Maturana AD, Rossier MF, Vuilleumier N. CD14 as a Mediator of the Mineralocorticoid Receptor-Dependent Anti-apolipoprotein A-1 IgG Chronotropic Effect on Cardiomyocytes. Endocrinology 2015; 156:4707-19. [PMID: 26393305 DOI: 10.1210/en.2015-1605] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In vitro and animal studies point to autoantibodies against apolipoprotein A-1 (anti-apoA-1 IgG) as possible mediators of cardiovascular (CV) disease involving several mechanisms such as basal heart rate interference mediated by a mineralocorticoid receptor-dependent L-type calcium channel activation, and a direct pro-inflammatory effect through the engagement of the toll-like receptor (TLR) 2/CD14 complex. Nevertheless, the possible implication of these receptors in the pro-arrhythmogenic effect of anti-apoA-1 antibodies remains elusive. We aimed at determining whether CD14 and TLRs could mediate the anti-apoA-1 IgG chronotropic response in neonatal rat ventricular cardiomyocytes (NRVC). Blocking CD14 suppressed anti-apoA-1 IgG binding to NRVC and the related positive chronotropic response. Anti-apoA-1 IgG alone induced the formation of a TLR2/TLR4/CD14 complex, followed by the phosphorylation of Src, whereas aldosterone alone promoted the phosphorylation of Akt by phosphatidylinositol 3-kinase (PI3K), without affecting the chronotropic response. In the presence of both aldosterone and anti-apoA-1 IgG, the localization of TLR2/TLR4/CD14 was increased in membrane lipid rafts, followed by PI3K and Src activation, leading to an L-type calcium channel-dependent positive chronotropic response. Pharmacological inhibition of the Src pathway led to the decrease of L-type calcium channel activity and abrogated the NRVC chronotropic response. Activation of CD14 seems to be a key regulator of the mineralocorticoid receptor-dependent anti-apoA-1 IgG positive chronotropic effect on NRVCs, involving relocation of the CD14/TLR2/TLR4 complex into lipid rafts followed by PI3K and Src-dependent L-type calcium channel activation.
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Affiliation(s)
- Tiphaine Mannic
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Nathalie Satta
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Sabrina Pagano
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Magaly Python
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Julien Virzi
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Fabrizio Montecucco
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Miguel A Frias
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Richard W James
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Andres D Maturana
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Michel F Rossier
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
| | - Nicolas Vuilleumier
- Human Protein Sciences Department, Chemistry and Proteomic Group, Auto-immunity and Atherogenesis group; and Division of Laboratory Medicine, Department of Genetics and Laboratory Medicine (T.M., N.S., J.V., F.M., N.V., M.F.R.), Geneva University Hospitals, 1201 Geneva, Switzerland; Department of Internal Medicine, Division of Endocrinology, Diabetology, Hypertension and Nutrition (M.P., M.A.F., R.W.J.), Geneva University Hospitals, Switzerland; Department of Bioengineering Sciences (A.D.M.), Graduate School of Bioagricultural Sciences, Furo-cho, Chikusa-ku, Nagoya 464-8601, Nagoya University, Japan; and Central Institute of the Hospital of Valais (M.F.R.), 1951 Sion, Switzerland
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14
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Mitochondrial ROS Induces Cardiac Inflammation via a Pathway through mtDNA Damage in a Pneumonia-Related Sepsis Model. PLoS One 2015; 10:e0139416. [PMID: 26448624 PMCID: PMC4598156 DOI: 10.1371/journal.pone.0139416] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 09/14/2015] [Indexed: 12/21/2022] Open
Abstract
We have previously shown that mitochondria-targeted vitamin E (Mito-Vit-E), a mtROS specific antioxidant, improves cardiac performance and attenuates inflammation in a pneumonia-related sepsis model. In this study, we applied the same approaches to decipher the signaling pathway(s) of mtROS-dependent cardiac inflammation after sepsis. Sepsis was induced in Sprague Dawley rats by intratracheal injection of S. pneumoniae. Mito-Vit-E, vitamin E or vehicle was administered 30 minutes later. In myocardium 24 hours post-inoculation, Mito-Vit-E, but not vitamin E, significantly protected mtDNA integrity and decreased mtDNA damage. Mito-Vit-E alleviated sepsis-induced reduction in mitochondria-localized DNA repair enzymes including DNA polymerase γ, AP endonuclease, 8-oxoguanine glycosylase, and uracil-DNA glycosylase. Mito-Vit-E dramatically improved metabolism and membrane integrity in mitochondria, suppressed leakage of mtDNA into the cytoplasm, inhibited up-regulation of Toll-like receptor 9 (TLR9) pathway factors MYD88 and RAGE, and limited RAGE interaction with its ligand TFAM in septic hearts. Mito-Vit-E also deactivated NF-κB and caspase 1, reduced expression of the essential inflammasome component ASC, and decreased inflammatory cytokine IL–1β. In vitro, both Mito-Vit-E and TLR9 inhibitor OND-I suppressed LPS-induced up-regulation in MYD88, RAGE, ASC, active caspase 1, and IL–1β in cardiomyocytes. Since free mtDNA escaped from damaged mitochondria function as a type of DAMPs to stimulate inflammation through TLR9, these data together suggest that sepsis-induced cardiac inflammation is mediated, at least partially, through mtDNA-TLR9-RAGE. At last, Mito-Vit-E reduced the circulation of myocardial injury marker troponin-I, diminished apoptosis and amended morphology in septic hearts, suggesting that mitochondria-targeted antioxidants are a potential cardioprotective approach for sepsis.
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15
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Third-degree hindpaw burn injury induced apoptosis of lumbar spinal cord ventral horn motor neurons and sciatic nerve and muscle atrophy in rats. BIOMED RESEARCH INTERNATIONAL 2015; 2015:372819. [PMID: 25695065 PMCID: PMC4324890 DOI: 10.1155/2015/372819] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Accepted: 11/25/2014] [Indexed: 12/17/2022]
Abstract
Background. Severe burns result in hypercatabolic state and concomitant muscle atrophy that persists for several months, thereby limiting patient recovery. However, the effects of burns on the corresponding spinal dermatome remain unknown. This study aimed to investigate whether burns induce apoptosis of spinal cord ventral horn motor neurons (VHMNs) and consequently cause skeletal muscle wasting. Methods. Third-degree hindpaw burn injury with 1% total body surface area (TBSA) rats were euthanized 4 and 8 weeks after burn injury. The apoptosis profiles in the ventral horns of the lumbar spinal cords, sciatic nerves, and gastrocnemius muscles were examined. The Schwann cells in the sciatic nerve were marked with S100. The gastrocnemius muscles were harvested to measure the denervation atrophy. Result. The VHMNs apoptosis in the spinal cord was observed after inducing third-degree burns in the hindpaw. The S100 and TUNEL double-positive cells in the sciatic nerve increased significantly after the burn injury. Gastrocnemius muscle apoptosis and denervation atrophy area increased significantly after the burn injury. Conclusion. Local hindpaw burn induces apoptosis in VHMNs and Schwann cells in sciatic nerve, which causes corresponding gastrocnemius muscle denervation atrophy. Our results provided an animal model to evaluate burn-induced muscle wasting, and elucidate the underlying mechanisms.
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16
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Barber RC, Maass DL, White DJ, Horton JW, Wolf SE, Minei JP, Zang QS. Deficiency in Heat Shock Factor 1 (HSF-1) Expression Exacerbates Sepsis-induced Inflammation and Cardiac Dysfunction. ACTA ACUST UNITED AC 2014; 1. [PMID: 30701190 DOI: 10.15226/2376-4570/1/1/00103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In the present study, we investigated whether absence of heat shock factor 1 (HSF-1) and inability to increase myocardial expression of heat shock proteins alter septic responses of inflammatory cytokines and myocardial contractility. HSF-1 knockout (hsf -/-) mice and wild type litter mates underwent a sterile (lipopolysaccharide; LPS) or infectious (Streptococcus pneumoniae or Klebsiella pneumoniae) septic challenge. Production of cytokines, TNF, IL-1β, IL-6 and IL-10, in the blood and from cardiomyocytes was exaggerated in the hsf -/- mice compared to responses measured in wild type mice given an identical septic challenge. This enhanced compartmentalized myocardial inflammation was associated with significantly decreased cardiac contraction and diminished relaxation in the hsf -/- mice. However, lacking HSF-1 expression did not affect intracellular calcium and sodium responses in cardiomyocytes isolated from septic challenged mice, suggesting that ion loading was not a major or sustaining cause of the greater myocardial contractile defects in hsf -/- mice. In conclusion, our data indicated that HSF-1 and downstream heat shock proteins are essential components to support cardiac function in sepsis. Further studies are warranted to further define the precise mechanisms of HSF-1 mediated cardiac protection.
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Affiliation(s)
- Robert C Barber
- University of North Texas Health Science Center, Department of Pharmacology and Neurosciences, Fort Worth, TX, USA
| | - David L Maass
- Department of Surgery, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
| | - D Jean White
- Department of Surgery, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
| | - Jureta W Horton
- Department of Surgery, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
| | - Steven E Wolf
- Department of Surgery, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
| | - Joseph P Minei
- Department of Surgery, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
| | - Qun S Zang
- Department of Surgery, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
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17
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Yao X, Wigginton JG, Maass DL, Ma L, Carlson D, Wolf SE, Minei JP, Zang QS. Estrogen-provided cardiac protection following burn trauma is mediated through a reduction in mitochondria-derived DAMPs. Am J Physiol Heart Circ Physiol 2014; 306:H882-94. [PMID: 24464748 DOI: 10.1152/ajpheart.00475.2013] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Mitochondria-derived danger-associated molecular patterns (DAMPs) play important roles in sterile inflammation after acute injuries. This study was designed to test the hypothesis that 17β-estradiol protects the heart via suppressing myocardial mitochondrial DAMPs after burn injury using an animal model. Sprague-Dawley rats were given a third-degree scald burn comprising 40% total body surface area (TBSA). 17β-Estradiol, 0.5 mg/kg, or control vehicle was administered subcutaneously 15 min following burn. The heart was harvested 24 h postburn. Estradiol showed significant inhibition on the productivity of H2O2 and oxidation of lipid molecules in the mitochondria. Estradiol increased mitochondrial antioxidant defense via enhancing the activities and expression of superoxide dismutase (SOD) and glutathione peroxidase (GPx). Estradiol also protected mitochondrial respiratory function and structural integrity. In parallel, estradiol remarkably decreased burn-induced release of mitochondrial cytochrome c and mitochondrial DNA (mtDNA) into cytoplasm. Further, estradiol inhibited myocardial apoptosis, shown by its suppression on DNA laddering and downregulation of caspase 1 and caspase 3. Estradiol's anti-inflammatory effect was demonstrated by reduction in systemic and cardiac cytokines (TNF-α, IL-1β, and IL-6), decrease in NF-κB activation, and attenuation of the expression of inflammasome component ASC in the heart of burned rats. Estradiol-provided cardiac protection was shown by reduction in myocardial injury marker troponin-I, amendment of heart morphology, and improvement of cardiac contractility after burn injury. Together, these data suggest that postburn administration of 17β-estradiol protects the heart via an effective control over the generation of mitochondrial DAMPs (mtROS, cytochrome c, and mtDNA) that incite cardiac apoptosis and inflammation.
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Affiliation(s)
- Xiao Yao
- Departments of Surgery, University of Texas Southwestern Medical Center, Dallas, Texas
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18
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Zang QS, Martinez B, Yao X, Maass DL, Ma L, Wolf SE, Minei JP. Sepsis-induced cardiac mitochondrial dysfunction involves altered mitochondrial-localization of tyrosine kinase Src and tyrosine phosphatase SHP2. PLoS One 2012; 7:e43424. [PMID: 22952679 PMCID: PMC3428365 DOI: 10.1371/journal.pone.0043424] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Accepted: 07/23/2012] [Indexed: 12/14/2022] Open
Abstract
Our previous research demonstrated that sepsis produces mitochondrial dysfunction with increased mitochondrial oxidative stress in the heart. The present study investigated the role of mitochondria-localized signaling molecules, tyrosine kinase Src and tyrosine phosphatase SHP2, in sepsis-induced cardiac mitochondrial dysfunction using a rat pneumonia-related sepsis model. SD rats were given an intratracheal injection of Streptococcus pneumoniae, 4×10(6) CFU per rat, (or vehicle for shams); heart tissues were then harvested and subcellular fractions were prepared. By Western blot, we detected a gradual and significant decrease in Src and an increase in SHP2 in cardiac mitochondria within 24 hours post-inoculation. Furthermore, at 24 hours post-inoculation, sepsis caused a near 70% reduction in tyrosine phosphorylation of all cardiac mitochondrial proteins. Decreased tyrosine phosphorylation of certain mitochondrial structural proteins (porin, cyclophilin D and cytochrome C) and functional proteins (complex II subunit 30kD and complex I subunit NDUFB8) were evident in the hearts of septic rats. In vitro, pre-treatment of mitochondrial fractions with recombinant active Src kinase elevated OXPHOS complex I and II-III activity, whereas the effect of SHP2 phosphatase was opposite. Neither Src nor SHP2 affected complex IV and V activity under the same conditions. By immunoprecipitation, we showed that Src and SHP2 consistently interacted with complex I and III in the heart, suggesting that complex I and III contain putative substrates of Src and SHP2. In addition, in vitro treatment of mitochondrial fractions with active Src suppressed sepsis-associated mtROS production and protected aconitase activity, an indirect marker of mitochondrial oxidative stress. On the contrary, active SHP2 phosphatase overproduced mtROS and deactivated aconitase under the same in vitro conditions. In conclusion, our data suggest that changes in mitochondria-localized signaling molecules Src and SHP2 constitute a potential signaling pathway to affect mitochondrial dysfunction in the heart during sepsis.
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Affiliation(s)
- Qun S Zang
- Department of Surgery, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America.
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19
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Oppeltz RF, Jatoi I. Tobacco and the escalating global cancer burden. JOURNAL OF ONCOLOGY 2011; 2011:408104. [PMID: 21869888 PMCID: PMC3159994 DOI: 10.1155/2011/408104] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Revised: 03/28/2011] [Accepted: 05/10/2011] [Indexed: 11/18/2022]
Abstract
The global burden of cancer is escalating as a result of dramatic increases in the use of tobacco in the developing world. The use of tobacco is linked to the development of a broad variety of cancers, mainly lung cancer, the single most common cancer in the world. Tobacco smoking-attributable deaths extends beyond cancer and include stroke, heart attack and COPD. Widening disparities in cancer-related mortality have shifted towards a more dramatic burden in the developing world. Appropriate interventions must be implemented to reduce tobacco use and prevent global mortality that has escalated to epidemic levels. Tobacco control policies, including public health advertisement campaigns, warning labels, adoption of smoke-free laws, comprehensive bans and tax policies are highly effective measures to control tobacco use. Clinicians and academic institutions have to be actively committed to support tobacco control initiatives. The reduction in cancer related morbidity and mortality should be viewed as a global crisis and definitive results will depend on a multilevel effort to effectively reduce the burden of cancer, particularly in underprivileged regions of the world.
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Affiliation(s)
- Richard F. Oppeltz
- Department of Surgery, The University of Texas Health Science Center, Mail Code 7738, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Ismail Jatoi
- Department of Surgery, The University of Texas Health Science Center, Mail Code 7738, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
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20
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Cellular mechanism underlying burn serum-generated bidirectional regulation of excitation-contraction coupling in isolated rat cardiomyocytes. Shock 2011; 35:388-95. [PMID: 21063240 DOI: 10.1097/shk.0b013e3182000379] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Myocardial depressant factors have long been recognized to be present in burn serum (BS) and contribute to burn-generated cardiac contractile dysfunction. However, much of the cellular and molecular mechanism for its role in the development of the cardiac deficiency remains unknown. In this study, we investigated the effect of BS on myocardial contractility and Ca handling in single rat cardiomyocytes. The results revealed that BS (5% by volume) bidirectionally regulated cardiac excitation-contraction (EC) coupling. The action potential-elicited Ca transient and cell shortening were increased by 28.0% ± 9.7% and 34.7% ± 12.5% within 20 min after BS stimulation (the upregulation phase), but decreased by 20.5% ± 6.8% and 32.3% ± 5.1% at 60 min after BS stimulation (the downregulation phase). There was a 32.0% ± 5.8% reduction in sarcoplasmic reticulum (SR) Ca content at the downregulation phase, whereas no alteration was detected at the upregulation phase. The incidences of spontaneous Ca sparks and Ca waves were significantly increased after BS stimulation, no matter at the upregulation or downregulation phase. The hyperactive Ca sparks and Ca waves could be completely abolished by antioxidative treatment (vitamin A, 0.2 mM; and vitamin E, 1 mM) and partially reversed by NOS inhibitor L-NAME (100 μM), but not by blocking Ca influx with nifedipine (1 μM). With the normalization of Ca sparks, BS-induced alterations of action potential-elicited Ca transient and contractility were prevented by antioxidative therapy. Taken together, we propose that BS-associated bidirectional regulation of EC coupling is attributed largely to oxidative stress-induced hyperactivity of ryanodine receptors, increasing EC coupling through enhancing intracellular Ca release initially, but subsequently decreasing EC coupling by partially depleting SR Ca content through enhancement of Ca spark-mediated SR leak.
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Burn-induced apoptosis of cardiomyocytes is survivin dependent and regulated by PI3K/Akt, p38 MAPK and ERK pathways. Basic Res Cardiol 2011; 106:1207-20. [DOI: 10.1007/s00395-011-0199-3] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 06/07/2011] [Accepted: 06/17/2011] [Indexed: 01/17/2023]
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