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Cheng X, Li Y, Wang H. Activation of Wnt/β-catenin signal induces DCs to differentiate into immune tolerant regDCs in septic mice. Mol Immunol 2024; 172:38-46. [PMID: 38870636 DOI: 10.1016/j.molimm.2024.04.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 02/06/2024] [Accepted: 04/28/2024] [Indexed: 06/15/2024]
Abstract
BACKGROUND Sepsis is a common complication among patients in intensive care units, and has a high mortality rate, with no effective therapies to date. As immunosuppression has become the research focus of sepsis, the regulatory role of dendritic cells (DCs) in the immune response to sepsis has received attention. OBJECTIVE To investigate the role of the Wnt/β-catenin signaling pathway in inducing the differentiation of splenic DCs in mice with sepsis caused by cecal ligation and puncture (CLP). METHODS C57bl/6 mice were randomly divided into three groups, namely the sham, 24 h post-CLP, and 72 h post-CLP groups. Levels of regulatory T cells (Tregs) among splenic mononuclear cells, suppressor T cells (TSs), and surface markers, such as major histocompatibility complex class II (MHC-II), co-stimulatory molecules (CD80 and CD86), negative co-stimulatory molecule death-ligand 1 (PD-L1), CC chemokine receptor-5 (CCR5), and CC chemokine receptor-7 (CCR7), were analyzed via flow cytometry for each group of mice post-surgery. CD11c+ DCs were purified from the splenic mononuclear cells of each group, and the expression of β-catenin, Wnt5a, and Wnt3a was detected using RT-PCR and western blotting.Each group of DCs was incubated with LPS-containing culture solution, and the supernatant of the culture solution was collected after 24 hours to detect the level of Tumor necrosis factor-α(TNF-α), interleukin (IL)-6, IL-12, and IL-10. RESULTS Compared with that in the sham group, the expression of β-catenin, Wnt5a, and Wnt3a in splenic DCs of the other two groups of mice increased with prolonged CLP exposure (P<0.05). Meanwhile, the proportion of Tregs and TSs increased in the mouse spleens after CLP, and levels of DC surface molecules, such as CCR5, CCR7, CD80, CD86, and MHC-II, decreased to different degrees, whereas those of PD-L1 increased. These results suggested that DCs differentiate towards regulatory DCs (regDCs) after CLP in mice. The results of ELISA showed that the longer the exposure time after CLP, the lower the ability of DCs to secrete TNF-α and IL-12, but the higher the level of IL-10 and IL-6. CONCLUSION The Wnt/β-catenin signaling pathway activates and induces regDCs differentiation in the splenic DCs of mice with sepsis and participates in the regulation of immune tolerance in the organism.
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Affiliation(s)
- Xia Cheng
- Graduate Training Base of Jinzhou Medical University (Department of Pathology, Fourth Medical Center, General Hospital of Chinese People's Liberation Army), Beijing 100048, China; Department of Pathology, The Fourth Medical Center of PLA General Hospital, Beijing 100048, China
| | - Yazhuo Li
- Department of Pathology, The Fourth Medical Center of PLA General Hospital, Beijing 100048, China
| | - Hongwei Wang
- Department of Pathology, The Fourth Medical Center of PLA General Hospital, Beijing 100048, China.
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2
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Hwang N, Ghanta S, Li Q, Lamattina AM, Murzin E, Lederer JA, El-Chemaly S, Chung SW, Liu X, Perrella MA. Carbon monoxide-induced autophagy enhances human mesenchymal stromal cell function via paracrine actions in murine polymicrobial sepsis. Mol Ther 2024; 32:2232-2247. [PMID: 38734903 PMCID: PMC11286814 DOI: 10.1016/j.ymthe.2024.05.018] [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: 12/01/2023] [Revised: 04/23/2024] [Accepted: 05/09/2024] [Indexed: 05/13/2024] Open
Abstract
Sepsis is a life-threatening process due to organ dysfunction resulting from severe infections. Mesenchymal stromal cells (MSCs) are being investigated as therapy for sepsis, along with conditioning regimens to improve their function. Carbon monoxide (CO) gas, which is cytoprotective at low doses, induces autophagy and is a mediator of inflammation. We evaluated CO-induced autophagy in human MSCs (hMSCs), and its impact on cell function in murine cecal ligation and puncture. Conditioning of hMSCs with CO ex vivo resulted in enhanced survival and bacterial clearance in vivo, and neutrophil phagocytosis of bacteria in vitro. Decreased neutrophil infiltration and less parenchymal cell death in organs were associated with increased macrophage efferocytosis of apoptotic neutrophils, promoting resolution of inflammation. These CO effects were lost when the cells were exposed to autophagy inhibition prior to gas exposure. When assessing paracrine actions of CO-induced autophagy, extracellular vesicles (EVs) were predominantly responsible. CO had no effect on EV production, but altered their miRNA cargo. Increased expression of miR-145-3p and miR-193a-3p by CO was blunted with disruption of autophagy, and inhibitors of these miRNAs led to a loss of neutrophil phagocytosis and macrophage efferocytosis. Collectively, CO-induced autophagy enhanced hMSC function during sepsis via paracrine actions of MSC-derived EVs.
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Affiliation(s)
- Narae Hwang
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Sailaja Ghanta
- Division of Newborn Medicine, Department of Pediatrics, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Qifei Li
- Division of Neonatology, Department of Pediatrics, University of Miami Miller School of Medicine and Jackson Health System, Miami, FL, USA
| | - Anthony M Lamattina
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Ekaterina Murzin
- Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - James A Lederer
- Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Souheil El-Chemaly
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Su Wol Chung
- School of Biological Sciences, University of Ulsan, Ulsan, South Korea
| | - Xiaoli Liu
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA; Division of Newborn Medicine, Department of Pediatrics, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Mark A Perrella
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA; Division of Newborn Medicine, Department of Pediatrics, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.
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3
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Mizugaki A, Wada T, Tsuchida T, Oda Y, Kayano K, Yamakawa K, Tanaka S. Neutrophil phenotypes implicated in the pathophysiology of post-traumatic sepsis. Front Med (Lausanne) 2022; 9:982399. [PMID: 36530874 PMCID: PMC9757139 DOI: 10.3389/fmed.2022.982399] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 11/09/2022] [Indexed: 08/27/2024] Open
Abstract
BACKGROUND The disruption of immune homeostasis after trauma is a major cause of post-traumatic organ dysfunction and/or sepsis. Recently, a variety of neutrophil phenotypes with distinct functions have been identified and suggested as involved in various clinical conditions. The association between neutrophil phenotypes and post-traumatic immunodeficiency has also been reported, yet the specific neutrophil phenotypes and their functional significance in post-traumatic sepsis have not been fully clarified. Therefore, we sought to investigate neutrophil phenotypic changes in a murine model, as these may hold prognostic value in post-traumatic sepsis. MATERIALS AND METHODS Third-degree burns affecting 25% of the body surface area were used to establish trauma model, and sepsis was induced 24 h later through cecal ligation and puncture (CLP). The Burn/CLP post-traumatic sepsis model and the Sham/CLP control model were established to assess the immunological status after trauma. Histopathological evaluation was performed on the spleen, liver, kidneys, and lung tissues. Immunological evaluation included the assessment of neutrophil markers using mass cytometry as well as cytokine measurements in serum and ascitic fluid through multiplex analysis using LUMINEX®. RESULTS The Burn/CLP group had a lower survival rate than the Sham/CLP group. Histopathological examination revealed an impaired immune response and more advanced organ damage in the Burn/CLP group. Furthermore, the Burn/CLP group exhibited higher levels of transforming growth factor-beta 1 in the blood and generally lower levels of cytokines than the Sham/CLP group. CD11b, which is involved in neutrophil adhesion and migration, was highly expressed on neutrophils in the Burn/CLP group. The expression of CD172a, which is related to the inhibition of phagocytosis, was also upregulated on neutrophils in the Burn/CLP group. The expression of sialic acid-binding lg-like lectin F and CD68 also differed between the two groups. CONCLUSION Different neutrophil phenotypes were observed between Burn/CLP and Sham/CLP groups, suggesting that neutrophils are implicated in the immune imbalance following trauma. However, further studies are needed to prove the causal relationships between neutrophil phenotypes and outcomes, including survival rate and organ dysfunction.
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Affiliation(s)
- Asumi Mizugaki
- Division of Acute and Critical Care Medicine, Department of Anesthesiology and Critical Care Medicine, Faculty of Medicine, Hokkaido University, Sapporo, Japan
| | - Takeshi Wada
- Division of Acute and Critical Care Medicine, Department of Anesthesiology and Critical Care Medicine, Faculty of Medicine, Hokkaido University, Sapporo, Japan
| | - Takumi Tsuchida
- Division of Acute and Critical Care Medicine, Department of Anesthesiology and Critical Care Medicine, Faculty of Medicine, Hokkaido University, Sapporo, Japan
| | - Yoshitaka Oda
- Department of Cancer Pathology, Faculty of Medicine, Hokkaido University, Sapporo, Japan
| | - Katsuhide Kayano
- Department of Emergency Medicine, Osaka Medical and Pharmaceutical University, Takatsuki, Japan
| | - Kazuma Yamakawa
- Department of Emergency Medicine, Osaka Medical and Pharmaceutical University, Takatsuki, Japan
| | - Shinya Tanaka
- Department of Cancer Pathology, Faculty of Medicine, Hokkaido University, Sapporo, Japan
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, Japan
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4
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Burmeister DM, Supp DM, Clark RA, Tredget EE, Powell HM, Enkhbaatar P, Bohannon JK, Cancio LC, Hill DM, Nygaard RM. Advantages and Disadvantages of Using Small and Large Animals in Burn Research: Proceedings of the 2021 Research Special Interest Group. J Burn Care Res 2022; 43:1032-1041. [PMID: 35778269 DOI: 10.1093/jbcr/irac091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Multiple animal species and approaches have been used for modeling different aspects of burn care, with some strategies considered more appropriate or translatable than others. On April 15, 2021, the Research Special Interest Group of the American Burn Association held a virtual session as part of the agenda for the annual meeting. The session was set up as a pro/con debate on the use of small versus large animals for application to four important aspects of burn pathophysiology: burn healing/conversion; scarring; inhalation injury; and sepsis. For each of these topics, 2 experienced investigators (one each for small and large animal models) described the advantages and disadvantages of using these preclinical models. The use of swine as a large animal model was a common theme due to anatomic similarities with human skin. The exception to this was a well-defined ovine model of inhalation injury; both of these species have larger airways which allow for incorporation of clinical tools such as bronchoscopes. However, these models are expensive and demanding from labor and resource standpoints. Various strategies have been implemented to make the more inexpensive rodent models appropriate for answering specific questions of interest in burns. Moreover, modelling burn-sepsis in large animals has proven difficult. It was agreed that the use of both small and large animal models have merit for answering basic questions about the responses to burn injury. Expert opinion and the ensuing lively conversations are summarized herein, which we hope will help inform experimental design of future research.
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Affiliation(s)
- David M Burmeister
- Uniformed Services University of the Health Sciences, Department of Medicine, Bethesda, MD, United States of America
| | - Dorothy M Supp
- Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA.,Scientific Staff, Shriners Children's Ohio, Dayton, OH, USA
| | - Richard A Clark
- Stony Brook University, Departments of Dermatology, Biomedical Engineering and Medicine, Stony Brook, NY, USA
| | - Edward E Tredget
- Firefighters' Burn Treatment Unit, Department of Surgery, 2D3.31 Mackenzie Health Sciences Centre, University of Alberta, Edmonton, AB, Canada
| | - Heather M Powell
- Department of Materials Science and Engineering, Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA.,Scientific Staff, Shriners Children's Ohio, Dayton, OH, USA
| | - Perenlei Enkhbaatar
- Department of Anesthesiology, Medical Branch, University of Texas, 301 University Boulevard, Galveston, TX, USA
| | - Julia K Bohannon
- Vanderbilt University Medical Center, Department of Anesthesiology, Department of Pathology, Microbiology, and Immunology, Nashville, TN, USA
| | - Leopoldo C Cancio
- United States Army Institute of Surgical Research, JBSA Fort Sam Houston, TX, USA
| | - David M Hill
- Firefighters' Burn Center, Regional One Health, 877 Jefferson Avenue, Memphis, TN, USA
| | - Rachel M Nygaard
- Department of Surgery, Hennepin Healthcare, Minneapolis, MN, USA
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5
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Guo F, Hancock B, Griffith A, Lin H, Howard K, Keegan J, Zhang F, Chicoine A, Cahill L, Ng J, Lederer J. Distinct Injury Responsive Regulatory T Cells Identified by Multi-Dimensional Phenotyping. Front Immunol 2022; 13:833100. [PMID: 35634302 PMCID: PMC9135044 DOI: 10.3389/fimmu.2022.833100] [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: 12/10/2021] [Accepted: 04/11/2022] [Indexed: 01/21/2023] Open
Abstract
CD4+ regulatory T cells (Tregs) activate and expand in response to different types of injuries, suggesting that they play a critical role in controlling the immune response to tissue and cell damage. This project used multi-dimensional profiling techniques to comprehensively characterize injury responsive Tregs in mice. We show that CD44high Tregs expand in response to injury and were highly suppressive when compared to CD44low Tregs. T cell receptor (TCR) repertoire analysis revealed that the CD44high Treg population undergo TCRαβ clonal expansion as well as increased TCR CDR3 diversity. Bulk RNA sequencing and single-cell RNA sequencing with paired TCR clonotype analysis identified unique differences between CD44high and CD44low Tregs and specific upregulation of genes in Tregs with expanded TCR clonotypes. Gene ontology analysis for molecular function of RNA sequencing data identified chemokine receptors and cell division as the most enriched functional terms in CD44high Tregs versus CD44low Tregs. Mass cytometry (CyTOF) analysis of Tregs from injured and uninjured mice verified protein expression of these genes on CD44high Tregs, with injury-induced increases in Helios, Galectin-3 and PYCARD expression. Taken together, these data indicate that injury triggers the expansion of a highly suppressive CD44high Treg population that is transcriptionally and phenotypically distinct from CD44low Tregs suggesting that they actively participate in controlling immune responses to injury and tissue damage.
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Affiliation(s)
- Fei Guo
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United States,Ningbo Medical Centre Lihuili Hospital, Ningbo University, Ningbo, China
| | - Brandon Hancock
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United States
| | - Alec Griffith
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United States
| | - Hui Lin
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United States,Department of Pathophysiology, School of Basic Medical Sciences, Nanchang University, Nanchang, China
| | - Kaitlyn Howard
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United States
| | - Joshua Keegan
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United States
| | - Fan Zhang
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United States,Department of Critical Care Medicine, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Adam Chicoine
- Human Immunology Center, Brigham and Women’s Hospital, Boston, MA, United States
| | - Laura Cahill
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United States
| | - Julie Ng
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital, Boston, MA, United States
| | - James Lederer
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United States,*Correspondence: James Lederer,
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Kwon M, Ghanta S, Ng J, Castano AP, Han J, Ith B, Lederer JA, El‐Chemaly S, Chung SW, Liu X, Perrella MA. Mesenchymal stromal cells expressing a dominant-negative high mobility group A1 transgene exhibit improved function during sepsis. J Leukoc Biol 2021; 110:711-722. [PMID: 33438259 PMCID: PMC8275698 DOI: 10.1002/jlb.4a0720-424r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 10/18/2020] [Accepted: 09/11/2020] [Indexed: 12/23/2022] Open
Abstract
High mobility group (HMG)A proteins are nonhistone chromatin proteins that bind to the minor groove of DNA, interact with transcriptional machinery, and facilitate DNA-directed nuclear processes. HMGA1 has been shown to regulate genes involved with systemic inflammatory processes. We hypothesized that HMGA1 is important in the function of mesenchymal stromal cells (MSCs), which are known to modulate inflammatory responses due to sepsis. To study this process, we harvested MSCs from transgenic (Tg) mice expressing a dominant-negative (dn) form of HMGA1 in mesenchymal cells. MSCs harvested from Tg mice contained the dnHMGA1 transgene, and transgene expression did not change endogenous HMGA1 levels. Immunophenotyping of the cells, along with trilineage differentiation revealed no striking differences between Tg and wild-type (WT) MSCs. However, Tg MSCs growth was decreased compared with WT MSCs, although Tg MSCs were more resistant to oxidative stress-induced death and expressed less IL-6. Tg MSCs administered after the onset of Escherichia coli-induced sepsis maintained their ability to improve survival when given in a single dose, in contrast with WT MSCs. This survival benefit of Tg MSCs was associated with less tissue cell death, and also a reduction in tissue neutrophil infiltration and expression of neutrophil chemokines. Finally, Tg MSCs promoted bacterial clearance and enhanced neutrophil phagocytosis, in part through their increased expression of stromal cell-derived factor-1 compared with WT MSCs. Taken together, these data demonstrate that expression of dnHMGA1 in MSCs provides a functional advantage of the cells when administered during bacterial sepsis.
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Affiliation(s)
- Min‐Young Kwon
- Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - Sailaja Ghanta
- Department of Pediatric Newborn MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - Julie Ng
- Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - Ana P. Castano
- Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - Junwen Han
- Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - Bonna Ith
- Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - James A. Lederer
- Department of SurgeryBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - Souheil El‐Chemaly
- Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - Su Wol Chung
- Department of Biological SciencesUniversity of UlsanUlsanSouth Korea
| | - Xiaoli Liu
- Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
- Department of Pediatric Newborn MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - Mark A. Perrella
- Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
- Department of Pediatric Newborn MedicineBrigham and Women's Hospital and Harvard Medical SchoolBostonMassachusettsUSA
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7
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Baron RM, Kwon MY, Castano AP, Ghanta S, Riascos-Bernal DF, Lopez-Guzman S, Macias AA, Ith B, Schissel SL, Lederer JA, Reeves R, Yet SF, Layne MD, Liu X, Perrella MA. Frontline Science: Targeted expression of a dominant-negative high mobility group A1 transgene improves outcome in sepsis. J Leukoc Biol 2018; 104:677-689. [PMID: 29975792 PMCID: PMC6431081 DOI: 10.1002/jlb.4hi0817-333rr] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 05/30/2018] [Accepted: 05/31/2018] [Indexed: 01/24/2023] Open
Abstract
High mobility group (HMG) proteins are a family of architectural transcription factors, with HMGA1 playing a role in the regulation of genes involved in promoting systemic inflammatory responses. We speculated that blocking HMGA1-mediated pathways might improve outcomes from sepsis. To investigate HMGA1 further, we developed genetically modified mice expressing a dominant negative (dn) form of HMGA1 targeted to the vasculature. In dnHMGA1 transgenic (Tg) mice, endogenous HMGA1 is present, but its function is decreased due to the mutant transgene. These mice allowed us to specifically study the importance of HMGA1 not only during a purely pro-inflammatory insult of endotoxemia, but also during microbial sepsis induced by implantation of a bacterial-laden fibrin clot into the peritoneum. We found that the dnHMGA1 transgene was only present in Tg and not wild-type (WT) littermate mice, and the mutant transgene was able to interact with transcription factors (such as NF-κB), but was not able to bind DNA. Tg mice exhibited a blunted hypotensive response to endotoxemia, and less mortality in microbial sepsis. Moreover, Tg mice had a reduced inflammatory response during sepsis, with decreased macrophage and neutrophil infiltration into tissues, which was associated with reduced expression of monocyte chemotactic protein-1 and macrophage inflammatory protein-2. Collectively, these data suggest that targeted expression of a dnHMGA1 transgene is able to improve outcomes in models of endotoxin exposure and microbial sepsis, in part by modulating the immune response and suggest a novel modifiable pathway to target therapeutics in sepsis.
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Affiliation(s)
- Rebecca M. Baron
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - Min-Young Kwon
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - Ana P. Castano
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - Sailaja Ghanta
- Department of Pediatric Newborn Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - Dario F. Riascos-Bernal
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
- Division of Cardiology, Department of Medicine, Albert Einstein College of Medicine, Bronx NY 10461
| | - Silvia Lopez-Guzman
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - Alvaro Andres Macias
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
- Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - Bonna Ith
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - Scott L. Schissel
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - James A. Lederer
- Department of Surgery, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - Raymond Reeves
- Department of Chemistry, School of Molecular Biosciences, and Institute of Biological Chemistry, Washington State University, Pullman, WA 99164
| | - Shaw-Fang Yet
- Institute of Cellular and System Medicine, National Health Research Institutes, Zhunan, Taiwan
| | - Matthew D. Layne
- Department of Biochemistry, Boston University School of Medicine, Boston, MA 02118
| | - Xiaoli Liu
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
- Department of Pediatric Newborn Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
| | - Mark A. Perrella
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
- Department of Pediatric Newborn Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
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8
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Mechanical ventilation and Streptococcus pneumoniae pneumonia alter mitochondrial homeostasis. Sci Rep 2018; 8:11718. [PMID: 30082877 PMCID: PMC6078986 DOI: 10.1038/s41598-018-30226-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 07/23/2018] [Indexed: 12/16/2022] Open
Abstract
Required mechanical ventilation (MV) may contribute to bacterial dissemination in patients with Streptococcus pneumoniae pneumonia. Significant variations in plasma mitochondrial DNA (mtDNA) have been reported in sepsis according to the outcome. The impact of lung stretch during MV was addressed in a model of pneumonia. Healthy or S. pneumoniae infected rabbits were submitted to MV or kept spontaneously breathing (SB). Bacterial burden, cytokines release, mitochondrial DNA levels, integrity and transcription were assessed along with 48-hour mortality. Compared with infected SB rabbits, MV rabbits developed more severe pneumonia with greater concentrations of bacteria in the lungs, higher rates of systemic dissemination, higher levels of circulating inflammatory mediators and decreased survival. Pulmonary mtDNA levels were significantly lower in infected animals as compared to non-infected ones, whenever they were SB or MV. After a significant early drop, circulating mtDNA levels returned to baseline values in the infected SB rabbits, but remained low until death in the MV ones. Whole blood ex-vivo stimulation with Streptococcus pneumoniae resulted in a reduction of polymorphonuclear leukocytes mitochondrial density and plasma mtDNA concentrations. Thus, persistent mitochondrial depletion and dysfunction in the infected animals submitted to MV could account for their less efficient immune response against S. pneumoniae.
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