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Huang B, Lin G, Chen F, Yang W, Zhang C, Yao Y, Zeng Q, Yang Y, Huang J. UCP2 knockout exacerbates sepsis-induced intestinal injury by promoting NLRP3-mediated pyroptosis. Int Immunopharmacol 2024; 141:112935. [PMID: 39159561 DOI: 10.1016/j.intimp.2024.112935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2024] [Revised: 07/05/2024] [Accepted: 08/12/2024] [Indexed: 08/21/2024]
Abstract
Sepsis-induced intestinal injury is a common complication that increases the morbidity and mortality associated with sepsis. UCP2, a mitochondrial membrane protein, is involved in numerous cellular processes, including metabolism, inflammation, and pyroptosis. According to our previous studies, UCP2 expression increases in septic intestinal tissue. However, its function in intestinal damage is not known. This work investigated UCP2's role in intestinal injury caused by sepsis. A sepsis mouse model was established in wild-type and UCP2-knockout (UCP2-KO) animals using cecal ligation and puncture (CLP). MCC950, an NLRP3 inflammasome inhibitor, was injected intraperitoneally 3 h before CLP surgery. Overall, significantly higher levels of UCP2 were observed in the intestines of septic mice. UCP2-KO mice subjected to CLP exhibited exacerbated intestinal damage, characterized by enhanced mucosal erosion, inflammatory cell infiltration, and increased intestinal permeability. Furthermore, UCP2 knockout significantly increased oxidative stress, inflammation, and pyroptosis in the CLP mouse intestines. Interestingly, MCC950 not only inhibited pyroptosis but also reversed inflammation, oxidative stress as well as damage to intestinal tissues as a result of UCP2 knockout. Our results highlighted the protective functions of UCP2 in sepsis-associated intestinal injury through modulation of inflammation and oxidative stress via NLRP3 inflammasome-induced pyroptosis.
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Affiliation(s)
- Bolun Huang
- Department of Pediatric Intensive Care Unit, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou 510623, China
| | - Gangxi Lin
- The School of Clinical Medicine, Fujian Medical University, Fuzhou 350007, China; Department of Pediatrics, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen 361003, China
| | - Feiyan Chen
- Department of Pediatric Intensive Care Unit, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou 510623, China
| | - Wenmin Yang
- Department of Pediatric Intensive Care Unit, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou 510623, China
| | - Chunmin Zhang
- Department of Pediatric Intensive Care Unit, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou 510623, China
| | - Yu Yao
- Department of Otolaryngology Head & Neck Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou 510280, China
| | - Qiyi Zeng
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510280, China
| | - Yiyu Yang
- Department of Pediatric Intensive Care Unit, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou 510623, China.
| | - Jinda Huang
- Department of Pediatric Intensive Care Unit, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou 510623, China.
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Sachidananda R, Bhat VK, Kurjogi M, Vanti GNL, Kayara M. Potential role of mitochondrial uncoupling protein 2 as a biomarker in patients with sepsis and septic shock: A prospective observational study. Indian J Anaesth 2024; 68:718-724. [PMID: 39176117 PMCID: PMC11338380 DOI: 10.4103/ija.ija_1181_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 04/14/2024] [Accepted: 05/04/2024] [Indexed: 08/24/2024] Open
Abstract
Background and Aims Early diagnosis of sepsis is crucial. The primary objective of this study was to explore the role of uncoupling protein 2 (UCP2) in diagnosing sepsis and septic shock. Methods This prospective observational study was conducted over 19 months. All adult patients aged more than 18 years with a diagnosis of sepsis or septic shock based on quick sequential organ failure assessment (qSOFA) score were enroled. Blood was drawn for procalcitonin (PCT) and UCP2 on days 0, 3, 7 and 28. Blood samples from 50 healthy volunteers were used as controls. An electrochemiluminescence test was done for PCT. A quantitative enzyme-linked immune sorbent assay was used for UCP2. The Chi-square test was used for qualitative variables and the independent t-test for quantitative variables. The receiver operator characteristic curve was used to evaluate the diagnostic efficacy of UCP2. Results A total of 128 subjects were included in the study. Out of these, 78 patients (qSOFA score ≥2) were subcategorised into the infection group, sepsis or septic shock group based on the PCT levels. The UCP2 levels in the infection, sepsis or septic shock group were significantly higher than in the control group (P > 0.001). The UCP2 levels correlated with PCT on admission, day 3 and day 7. Conclusion The UCP2 levels were significantly higher in sepsis and septic shock groups compared to controls and hence could be a potential diagnostic biomarker of sepsis.
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Affiliation(s)
- Roopa Sachidananda
- Department of Anaesthesia, Karnataka Institute of Medical Sciences, Hubli, Karnataka, India
| | - Vikram Kemmannu Bhat
- Department of ENT, Karnataka Institute of Medical Sciences, Hubli, Karnataka, India
| | - Mahantesh Kurjogi
- Department of Multi-Disciplinary Research Unit, Karnataka Institute of Medical Sciences, Hubli, Karnataka, India
| | - Gulam Nabi L. Vanti
- Department of Multi-Disciplinary Research Unit, Karnataka Institute of Medical Sciences, Hubli, Karnataka, India
| | - Madhura Kayara
- Department of Anaesthesia, Karnataka Institute of Medical Sciences, Hubli, Karnataka, India
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Pokharel MD, Garcia-Flores A, Marciano D, Franco MC, Fineman JR, Aggarwal S, Wang T, Black SM. Mitochondrial network dynamics in pulmonary disease: Bridging the gap between inflammation, oxidative stress, and bioenergetics. Redox Biol 2024; 70:103049. [PMID: 38295575 PMCID: PMC10844980 DOI: 10.1016/j.redox.2024.103049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Accepted: 01/16/2024] [Indexed: 02/02/2024] Open
Abstract
Once thought of in terms of bioenergetics, mitochondria are now widely accepted as both the orchestrator of cellular health and the gatekeeper of cell death. The pulmonary disease field has performed extensive efforts to explore the role of mitochondria in regulating inflammation, cellular metabolism, apoptosis, and oxidative stress. However, a critical component of these processes needs to be more studied: mitochondrial network dynamics. Mitochondria morphologically change in response to their environment to regulate these processes through fusion, fission, and mitophagy. This allows mitochondria to adapt their function to respond to cellular requirements, a critical component in maintaining cellular homeostasis. For that reason, mitochondrial network dynamics can be considered a bridge that brings multiple cellular processes together, revealing a potential pathway for therapeutic intervention. In this review, we discuss the critical modulators of mitochondrial dynamics and how they are affected in pulmonary diseases, including chronic obstructive pulmonary disease (COPD), idiopathic pulmonary fibrosis (IPF), acute lung injury (ALI), and pulmonary arterial hypertension (PAH). A dysregulated mitochondrial network plays a crucial role in lung disease pathobiology, and aberrant fission/fusion/mitophagy pathways are druggable processes that warrant further exploration. Thus, we also discuss the candidates for lung disease therapeutics that regulate mitochondrial network dynamics.
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Affiliation(s)
- Marissa D Pokharel
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Alejandro Garcia-Flores
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA
| | - David Marciano
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Maria C Franco
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Jeffrey R Fineman
- Department of Pediatrics, UC San Francisco, San Francisco, CA, 94143, USA
| | - Saurabh Aggarwal
- Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Ting Wang
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, 33199, USA
| | - Stephen M Black
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA; Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, 33199, USA.
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Emin MT, Lee MJ, Bhattacharya J, Hough RF. Mitochondria of lung venular capillaries mediate lung-liver cross talk in pneumonia. Am J Physiol Lung Cell Mol Physiol 2023; 325:L277-L287. [PMID: 37431588 PMCID: PMC10625830 DOI: 10.1152/ajplung.00209.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/02/2023] [Accepted: 07/03/2023] [Indexed: 07/12/2023] Open
Abstract
Failure of the lung's endothelial barrier underlies lung injury, which causes the high mortality acute respiratory distress syndrome (ARDS). Multiple organ failure predisposes to the mortality, but mechanisms are poorly understood. Here, we show that mitochondrial uncoupling protein 2 (UCP2), a component of the mitochondrial inner membrane, plays a role in the barrier failure. Subsequent lung-liver cross talk mediated by neutrophil activation causes liver congestion. We intranasally instilled lipopolysaccharide (LPS). Then, we viewed the lung endothelium by real-time confocal imaging of the isolated, blood-perfused mouse lung. LPS caused alveolar-capillary transfer of reactive oxygen species and mitochondrial depolarization in lung venular capillaries. The mitochondrial depolarization was inhibited by transfection of alveolar Catalase and vascular knockdown of UCP2. LPS instillation caused lung injury as indicated by increases in bronchoalveolar lavage (BAL) protein content and extravascular lung water. LPS or Pseudomonas aeruginosa instillation also caused liver congestion, quantified by liver hemoglobin and plasma aspartate aminotransferase (AST) increases. Genetic inhibition of vascular UCP2 prevented both lung injury and liver congestion. Antibody-mediated neutrophil depletion blocked the liver responses, but not lung injury. Knockdown of lung vascular UCP2 mitigated P. aeruginosa-induced mortality. Together, these data suggest a mechanism in which bacterial pneumonia induces oxidative signaling to lung venular capillaries, known sites of inflammatory signaling in the lung microvasculature, depolarizing venular mitochondria. Successive activation of neutrophils induces liver congestion. We conclude that oxidant-induced UCP2 expression in lung venular capillaries causes a mechanistic sequence leading to liver congestion and mortality. Lung vascular UCP2 may present a therapeutic target in ARDS.NEW & NOTEWORTHY We report that mitochondrial injury in lung venular capillaries underlies barrier failure in pneumonia, and venular capillary uncoupling protein 2 (UCP2) causes neutrophil-mediated liver congestion. Using in situ imaging, we found that epithelial-endothelial transfer of H2O2 activates UCP2, depolarizing mitochondria in venular capillaries. The conceptual advance from our findings is that mitochondrial depolarization in lung capillaries mediates liver cross talk through circulating neutrophils. Pharmacologic blockade of UCP2 could be a therapeutic strategy for lung injury.
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Affiliation(s)
- Memet T Emin
- Department of Pediatrics, Pediatric Critical Care and Hospital Medicine, Columbia University Irving Medical Center, New York, New York, United States
| | - Michael J Lee
- Department of Pathology and Cell Biology, Columbia University, New York, New York, United States
| | - Jahar Bhattacharya
- Lung Biology Laboratory, Pulmonary Division, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, New York, United States
| | - Rebecca F Hough
- Department of Pediatrics, Pediatric Critical Care and Hospital Medicine, Columbia University Irving Medical Center, New York, New York, United States
- Lung Biology Laboratory, Pulmonary Division, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, New York, United States
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5
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Pokharel MD, Marciano DP, Fu P, Franco MC, Unwalla H, Tieu K, Fineman JR, Wang T, Black SM. Metabolic reprogramming, oxidative stress, and pulmonary hypertension. Redox Biol 2023; 64:102797. [PMID: 37392518 PMCID: PMC10363484 DOI: 10.1016/j.redox.2023.102797] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/15/2023] [Accepted: 06/23/2023] [Indexed: 07/03/2023] Open
Abstract
Mitochondria are highly dynamic organelles essential for cell metabolism, growth, and function. It is becoming increasingly clear that endothelial cell dysfunction significantly contributes to the pathogenesis and vascular remodeling of various lung diseases, including pulmonary arterial hypertension (PAH), and that mitochondria are at the center of this dysfunction. The more we uncover the role mitochondria play in pulmonary vascular disease, the more apparent it becomes that multiple pathways are involved. To achieve effective treatments, we must understand how these pathways are dysregulated to be able to intervene therapeutically. We know that nitric oxide signaling, glucose metabolism, fatty acid oxidation, and the TCA cycle are abnormal in PAH, along with alterations in the mitochondrial membrane potential, proliferation, and apoptosis. However, these pathways are incompletely characterized in PAH, especially in endothelial cells, highlighting the urgent need for further research. This review summarizes what is currently known about how mitochondrial metabolism facilitates a metabolic shift in endothelial cells that induces vascular remodeling during PAH.
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Affiliation(s)
- Marissa D Pokharel
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Cellular Biology & Pharmacology, Howard Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - David P Marciano
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Cellular Biology & Pharmacology, Howard Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Panfeng Fu
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, 33199, USA
| | - Maria Clara Franco
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Cellular Biology & Pharmacology, Howard Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Hoshang Unwalla
- Department of Immunology and Nano-Medicine, Howard Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Kim Tieu
- Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, 33199, USA
| | - Jeffrey R Fineman
- Department of Pediatrics, The University of California San Francisco, San Francisco, CA, 94143, USA; Cardiovascular Research Institute, The University of California San Francisco, San Francisco, CA, 94143, USA
| | - Ting Wang
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, 33199, USA
| | - Stephen M Black
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Cellular Biology & Pharmacology, Howard Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA; Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, 33199, USA.
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Uzunlulu G, Uzunlulu M, Gencer A, Özdoğru F, Seven S. Knowledge on Medical Waste Management Among Health Care Personnel: A Report from Turkey. CYPRUS JOURNAL OF MEDICAL SCIENCES 2022. [DOI: 10.4274/cjms.2020.1107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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7
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What's New in Shock, September 2020? Shock 2021; 54:277-279. [PMID: 32796495 DOI: 10.1097/shk.0000000000001588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Huang W, Wang X, Zhang H, Wang G, Liu D. Prognostic Significance of the Fission1/Parkin Ratio for Sepsis: A Prospective Cohort Study. Front Med (Lausanne) 2021; 8:642749. [PMID: 34055831 PMCID: PMC8155307 DOI: 10.3389/fmed.2021.642749] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 04/08/2021] [Indexed: 12/27/2022] Open
Abstract
Introduction: Fission1 (Fis1) and parkin are key proteins related to mitochondrial fission and mitophagy, respectively. This study aimed to assess the prognostic value of the Fis1/parkin ratio as a biomarker in patients with sepsis. Methods: Consecutive patients with sepsis (n = 133) or simple infection (n = 24) were enrolled within 24 h of arrival at the intensive care unit (ICU). Serum levels of Fis1, parkin, mitofusin2 (Mfn2), and peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) were measured by enzyme-linked immunosorbent assay (ELISA) upon ICU admission. Clinical parameters and standard laboratory test data were also collected. All patients received follow-up for at least 28 days. Results: Patients with sepsis presented with significantly decreased serum levels of parkin, Mfn2, and PGC-1α, but an increased serum Fis1 level and Fis1/parkin, Fis1/Mfn2, and Fis1/PGC-1α ratios at ICU admission. Relative to patients with simple infections, the ratios were remarkably elevated in septic patients—particularly septic shock patients. The area under the receiver operating characteristic (ROC) curve of the Fis1/parkin ratio was greater than that of Fis1, parkin, Mfn2, and PGC-1α levels as well as that of the Fis1/Mfn2 and Fis1/PGC-1α ratios for prediction of 28-day mortality due to sepsis. All of the ratios were significantly higher in non-survivors than survivors at the 28-day follow-up examination. Fis1/parkin ratio was found to be an independent predictor of 28-day mortality in patients with sepsis. Conclusions: The Fis1/parkin ratio is valuable for risk stratification in patients with sepsis and is associated with poor clinical outcomes for sepsis in the ICU.
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Affiliation(s)
- Wei Huang
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Xiaoting Wang
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Hongmin Zhang
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Guangjian Wang
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Dawei Liu
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
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Vallejo FA, Vanni S, Graham RM. UCP2 as a Potential Biomarker for Adjunctive Metabolic Therapies in Tumor Management. Front Oncol 2021; 11:640720. [PMID: 33763373 PMCID: PMC7982524 DOI: 10.3389/fonc.2021.640720] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 02/01/2021] [Indexed: 12/16/2022] Open
Abstract
Glioblastoma (GBM) remains one of the most lethal primary brain tumors in both adult and pediatric patients. Targeting tumor metabolism has emerged as a promising-targeted therapeutic strategy for GBM and characteristically resistant GBM stem-like cells (GSCs). Neoplastic cells, especially those with high proliferative potential such as GSCs, have been shown to upregulate UCP2 as a cytoprotective mechanism in response to chronic increased reactive oxygen species (ROS) exposure. This upregulation plays a central role in the induction of the highly glycolytic phenotype associated with many tumors. In addition to shifting metabolism away from oxidative phosphorylation, UCP2 has also been implicated in increased mitochondrial Ca2+ sequestration, apoptotic evasion, dampened immune response, and chemotherapeutic resistance. A query of the CGGA RNA-seq and the TCGA GBMLGG database demonstrated that UCP2 expression increases with increased WHO tumor-grade and is associated with much poorer prognosis across a cohort of brain tumors. UCP2 expression could potentially serve as a biomarker to stratify patients for adjunctive anti-tumor metabolic therapies, such as glycolytic inhibition alongside current standard of care, particularly in adult and pediatric gliomas. Additionally, because UCP2 correlates with tumor grade, monitoring serum protein levels in the future may allow clinicians a relatively minimally invasive marker to correlate with disease progression. Further investigation of UCP2’s role in metabolic reprogramming is warranted to fully appreciate its clinical translatability and utility.
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Affiliation(s)
- Frederic A Vallejo
- Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, United States.,University of Miami Brain Tumor Initiative, Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, United States
| | - Steven Vanni
- Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, United States
| | - Regina M Graham
- Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, United States.,University of Miami Brain Tumor Initiative, Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, United States.,Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, United States
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Mao JY, Su LX, Li DK, Zhang HM, Wang XT, Liu DW. The effects of UCP2 on autophagy through the AMPK signaling pathway in septic cardiomyopathy and the underlying mechanism. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:259. [PMID: 33708886 PMCID: PMC7940903 DOI: 10.21037/atm-20-4819] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Background Mitochondrial dysfunction plays an important role in the development of septic cardiomyopathy. This study aimed to reveal the protective role of uncoupling protein 2 (UCP2) in mitochondria through AMP-activated protein kinase (AMPK) on autophagy during septic cardiomyopathy. Methods UCP2 knockout mice via a cecal ligation and puncture (CLP) model and the H9C2 cardiomyocyte cell line in response to lipopolysaccharide (LPS) in vitro were used to study the effect. The myocardial morphological alterations, indicators of mitochondrial injury and levels of autophagy-associated proteins (pAMPK, pmTOR, pULK1, pTSC2, Beclin-1, and LC3-I/II) were assessed. In addition, the mechanism of the interaction between UCP2 and AMPK was further studied through gain- and loss-of-function studies. Results Compared with the wild-type mice, the UCP2 knockout mice exhibited more severe cardiomyocyte injury after CLP, and the AMPK agonist AICAR protected against such injury. Consistent with this result, silencing UCP2 augmented the LPS-induced pathological damage and mitochondrial injury in the H9C2 cells, limited the upregulation of autophagy proteins and reduced AMPK phosphorylation. AICAR protected the cells from morphological changes and mitochondrial membrane potential loss and promoted autophagy. The silencing and overexpression of UCP2 led to correlated changes in the AMPK upstream kinases pLKB1 and CAMKK2. Conclusions UCP2 exerts cardioprotective effects on mitochondrial dysfunction during sepsis via the action of AMPK on autophagy.
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Affiliation(s)
- Jia-Yu Mao
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing 100730, China
| | - Long-Xiang Su
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing 100730, China
| | - Dong-Kai Li
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing 100730, China
| | - Hong-Min Zhang
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing 100730, China
| | - Xiao-Ting Wang
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing 100730, China
| | - Da-Wei Liu
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing 100730, China
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