1
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Bock F, Dong X, Li S, Viquez OM, Sha E, Tantengco M, Hennen EM, Plosa E, Ramezani A, Brown KL, Whang YM, Terker AS, Arroyo JP, Harrison DG, Fogo A, Brakebusch CH, Pozzi A, Zent R. Rac1 promotes kidney collecting duct repair by mechanically coupling cell morphology to mitotic entry. SCIENCE ADVANCES 2024; 10:eadi7840. [PMID: 38324689 PMCID: PMC10849615 DOI: 10.1126/sciadv.adi7840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 01/03/2024] [Indexed: 02/09/2024]
Abstract
Prolonged obstruction of the ureter, which leads to injury of the kidney collecting ducts, results in permanent structural damage, while early reversal allows for repair. Cell structure is defined by the actin cytoskeleton, which is dynamically organized by small Rho guanosine triphosphatases (GTPases). In this study, we identified the Rho GTPase, Rac1, as a driver of postobstructive kidney collecting duct repair. After the relief of ureteric obstruction, Rac1 promoted actin cytoskeletal reconstitution, which was required to maintain normal mitotic morphology allowing for successful cell division. Mechanistically, Rac1 restricted excessive actomyosin activity that stabilized the negative mitotic entry kinase Wee1. This mechanism ensured mechanical G2-M checkpoint stability and prevented premature mitotic entry. The repair defects following injury could be rescued by direct myosin inhibition. Thus, Rac1-dependent control of the actin cytoskeleton integrates with the cell cycle to mediate kidney tubular repair by preventing dysmorphic cells from entering cell division.
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Affiliation(s)
- Fabian Bock
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Veterans Affairs Hospital, Tennessee Valley Healthcare System, Nashville, TN, USA
- Vanderbilt Center for Kidney Disease, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Xinyu Dong
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Shensen Li
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Olga M. Viquez
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Eric Sha
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Matthew Tantengco
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Elizabeth M. Hennen
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Erin Plosa
- Division of Neonatology, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Alireza Ramezani
- Interdisciplinary Center for Quantitative Modeling in Biology, University of California, Riverside, CA, USA
- Department of Physics and Astronomy, University of California, Riverside, CA, USA
| | - Kyle L. Brown
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Young Mi Whang
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Andrew S. Terker
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt Center for Kidney Disease, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Juan Pablo Arroyo
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Veterans Affairs Hospital, Tennessee Valley Healthcare System, Nashville, TN, USA
- Vanderbilt Center for Kidney Disease, Vanderbilt University Medical Center, Nashville, TN, USA
| | - David G. Harrison
- Division of Clinical Pharmacology, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Agnes Fogo
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Cord H. Brakebusch
- Biotech Research Center, University of Copenhagen, Copenhagen DK-2200, Denmark
| | - Ambra Pozzi
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Veterans Affairs Hospital, Tennessee Valley Healthcare System, Nashville, TN, USA
- Vanderbilt Center for Kidney Disease, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Physiology and Molecular Biophysics, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Roy Zent
- Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Veterans Affairs Hospital, Tennessee Valley Healthcare System, Nashville, TN, USA
- Vanderbilt Center for Kidney Disease, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
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2
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Huang Q, Le Y, Li S, Bian Y. Signaling pathways and potential therapeutic targets in acute respiratory distress syndrome (ARDS). Respir Res 2024; 25:30. [PMID: 38218783 PMCID: PMC10788036 DOI: 10.1186/s12931-024-02678-5] [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: 09/30/2023] [Accepted: 01/03/2024] [Indexed: 01/15/2024] Open
Abstract
Acute respiratory distress syndrome (ARDS) is a common condition associated with critically ill patients, characterized by bilateral chest radiographical opacities with refractory hypoxemia due to noncardiogenic pulmonary edema. Despite significant advances, the mortality of ARDS remains unacceptably high, and there are still no effective targeted pharmacotherapeutic agents. With the outbreak of coronavirus disease 19 worldwide, the mortality of ARDS has increased correspondingly. Comprehending the pathophysiology and the underlying molecular mechanisms of ARDS may thus be essential to developing effective therapeutic strategies and reducing mortality. To facilitate further understanding of its pathogenesis and exploring novel therapeutics, this review provides comprehensive information of ARDS from pathophysiology to molecular mechanisms and presents targeted therapeutics. We first describe the pathogenesis and pathophysiology of ARDS that involve dysregulated inflammation, alveolar-capillary barrier dysfunction, impaired alveolar fluid clearance and oxidative stress. Next, we summarize the molecular mechanisms and signaling pathways related to the above four aspects of ARDS pathophysiology, along with the latest research progress. Finally, we discuss the emerging therapeutic strategies that show exciting promise in ARDS, including several pharmacologic therapies, microRNA-based therapies and mesenchymal stromal cell therapies, highlighting the pathophysiological basis and the influences on signal transduction pathways for their use.
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Affiliation(s)
- Qianrui Huang
- Department of Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095, Jie Fang Avenue, Wuhan, 430030, China
- Department of Emergency Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1095, Jie Fang Avenue, Wuhan, 430030, China
| | - Yue Le
- Department of Critical Care Medicine, Zhongda Hospital, School of Medicine, Southeast University, 87 Dingjia Bridge, Hunan Road, Gu Lou District, Nanjing, 210009, China
| | - Shusheng Li
- Department of Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095, Jie Fang Avenue, Wuhan, 430030, China.
- Department of Emergency Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1095, Jie Fang Avenue, Wuhan, 430030, China.
| | - Yi Bian
- Department of Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095, Jie Fang Avenue, Wuhan, 430030, China.
- Department of Emergency Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1095, Jie Fang Avenue, Wuhan, 430030, China.
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3
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Tang S, De Jesus AC, Chavez D, Suthakaran S, Moore SK, Suthakaran K, Homami S, Rathnasinghe R, May AJ, Schotsaert M, Britto CJ, Bhattacharya J, Hook JL. Rescue of alveolar wall liquid secretion blocks fatal lung injury due to influenza-staphylococcal coinfection. J Clin Invest 2023; 133:e163402. [PMID: 37581936 PMCID: PMC10541650 DOI: 10.1172/jci163402] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 08/10/2023] [Indexed: 08/17/2023] Open
Abstract
Secondary lung infection by inhaled Staphylococcus aureus (SA) is a common and lethal event for individuals infected with influenza A virus (IAV). How IAV disrupts host defense to promote SA infection in lung alveoli, where fatal lung injury occurs, is not known. We addressed this issue using real-time determinations of alveolar responses to IAV in live, intact, perfused lungs. Our findings show that IAV infection blocked defensive alveolar wall liquid (AWL) secretion and induced airspace liquid absorption, thereby reversing normal alveolar liquid dynamics and inhibiting alveolar clearance of inhaled SA. Loss of AWL secretion resulted from inhibition of the cystic fibrosis transmembrane conductance regulator (CFTR) ion channel in the alveolar epithelium, and airspace liquid absorption was caused by stimulation of the alveolar epithelial Na+ channel (ENaC). Loss of AWL secretion promoted alveolar stabilization of inhaled SA, but rescue of AWL secretion protected against alveolar SA stabilization and fatal SA-induced lung injury in IAV-infected mice. These findings reveal a central role for AWL secretion in alveolar defense against inhaled SA and identify AWL inhibition as a critical mechanism of IAV lung pathogenesis. AWL rescue may represent a new therapeutic approach for IAV-SA coinfection.
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Affiliation(s)
- Stephanie Tang
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
- Graduate School of Biomedical Sciences
| | - Ana Cassandra De Jesus
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
| | - Deebly Chavez
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
| | - Sayahi Suthakaran
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
- Graduate School of Biomedical Sciences
| | - Sarah K.L. Moore
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
| | - Keshon Suthakaran
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
| | - Sonya Homami
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
- Graduate School of Biomedical Sciences
| | - Raveen Rathnasinghe
- Graduate School of Biomedical Sciences
- Global Health and Emerging Pathogens Institute, Department of Microbiology
| | - Alison J. May
- Department of Cell, Developmental and Regenerative Biology
- Department of Otolaryngology, and
- Institute of Regenerative Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Michael Schotsaert
- Global Health and Emerging Pathogens Institute, Department of Microbiology
| | - Clemente J. Britto
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Jahar Bhattacharya
- Departments of Medicine and Physiology and Cellular Biophysics, College of Physicians and Surgeons, Columbia University Medical Center, New York, New York, USA
| | - Jaime L. Hook
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
- Global Health and Emerging Pathogens Institute, Department of Microbiology
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Mthunzi L, Gusarova GA, Islam MN, Bhattacharya S, Bhattacharya J. Sessile alveolar macrophage connexin-43 determines mechano-immunity in the lung. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.24.541735. [PMID: 37292826 PMCID: PMC10245918 DOI: 10.1101/2023.05.24.541735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Although lung immunity is pathogen induced, the immunity can also be induced by mechanical distortion of the lung. The causal basis of the lung's mechanosensitive immunity remains unclear. Here, through live optical imaging of mouse lungs, we show that alveolar stretch due to hyperinflation induced prolonged cytosolic Ca2+ increases in sessile alveolar macrophages (AMs). Knockout studies revealed that the Ca2+ increases resulted from Ca2+ diffusion from the alveolar epithelium to sessile AMs through connexin 43 (Cx43)-containing gap junctions. Lung inflammation and injury in mice exposed to injurious mechanical ventilation were inhibited by AM-specific Cx43 knockout, or AM-specific delivery of a calcium inhibitor. We conclude, Cx43 gap junctions and calcium mobilization in sessile AMs determine the lung's mechanosensitive immunity, providing a therapeutic strategy against hyperinflation-induced lung injury.
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Affiliation(s)
- Liberty Mthunzi
- Lung Biology Laboratory, Division of Pulmonary Allergy and Critical Care, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032
| | - Galina A Gusarova
- Lung Biology Laboratory, Division of Pulmonary Allergy and Critical Care, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032
| | - Mohammad N Islam
- Lung Biology Laboratory, Division of Pulmonary Allergy and Critical Care, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032
| | - Sunita Bhattacharya
- Lung Biology Laboratory, Division of Pulmonary Allergy and Critical Care, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032
| | - Jahar Bhattacharya
- Lung Biology Laboratory, Division of Pulmonary Allergy and Critical Care, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032
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5
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Shmarakov IO, Gusarova GA, Islam MN, Marhuenda-Muñoz M, Bhattacharya J, Blaner WS. Retinoids stored locally in the lung are required to attenuate the severity of acute lung injury in male mice. Nat Commun 2023; 14:851. [PMID: 36792627 PMCID: PMC9932169 DOI: 10.1038/s41467-023-36475-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 02/01/2023] [Indexed: 02/17/2023] Open
Abstract
Retinoids are potent transcriptional regulators that act in regulating cell proliferation, differentiation, and other cellular processes. We carried out studies in male mice to establish the importance of local cellular retinoid stores within the lung alveolus for maintaining its health in the face of an acute inflammatory challenge induced by intranasal instillation of lipopolysaccharide. We also undertook single cell RNA sequencing and bioinformatic analyses to identify roles for different alveolar cell populations involved in mediating these retinoid-dependent responses. Here we show that local retinoid stores and uncompromised metabolism and signaling within the lung are required to lessen the severity of an acute inflammatory challenge. Unexpectedly, our data also establish that alveolar cells other than lipofibroblasts, specifically microvascular endothelial and alveolar epithelial cells, are able to take up lipoprotein-transported retinoid and to accumulate cellular retinoid stores that are directly used to respond to an acute inflammatory challenge.
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Affiliation(s)
- Igor O Shmarakov
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, 10032, USA.
- Department of Animal Sciences, School of Environmental and Biological Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ, 08901, USA.
| | - Galina A Gusarova
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, 10032, USA
| | - Mohammad N Islam
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, 10032, USA
| | - María Marhuenda-Muñoz
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, 10032, USA
- Centro de Investigación Biomédica en Red Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, 28029, Madrid, Spain
- Department of Nutrition, Food Science and Gastronomy, School of Pharmacy and Food Sciences and XIA, Institute of Nutrition and Food Safety (INSA-UB), University of Barcelona, 08921, Santa Coloma de Gramenet, Spain
| | - Jahar Bhattacharya
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, 10032, USA
| | - William S Blaner
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, 10032, USA
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The mitochondrial calcium uniporter of pulmonary type 2 cells determines severity of acute lung injury. Nat Commun 2022; 13:5837. [PMID: 36192486 PMCID: PMC9529882 DOI: 10.1038/s41467-022-33543-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Accepted: 09/21/2022] [Indexed: 11/28/2022] Open
Abstract
Acute Lung Injury (ALI) due to inhaled pathogens causes high mortality. Underlying mechanisms are inadequately understood. Here, by optical imaging of live mouse lungs we show that a key mechanism is the viability of cytosolic Ca2+ buffering by the mitochondrial Ca2+ uniporter (MCU) in the lung’s surfactant-secreting, alveolar type 2 cells (AT2). The buffering increased mitochondrial Ca2+ and induced surfactant secretion in wild-type mice, but not in mice with AT2-specific MCU knockout. In the knockout mice, ALI due to intranasal LPS instillation caused severe pulmonary edema and mortality, which were mitigated by surfactant replenishment prior to LPS instillation, indicating surfactant’s protective effect against alveolar edema. In wild-type mice, intranasal LPS, or Pseudomonas aeruginosa decreased AT2 MCU. Loss of MCU abrogated buffering. The resulting mortality was reduced by spontaneous recovery of MCU expression, or by MCU replenishment. Enhancement of AT2 mitochondrial buffering, hence endogenous surfactant secretion, through MCU replenishment might be a therapy against ALI. Acute lung injury caused by inhalation of pathogens leads to mortality, but the mechanisms are unclear. Here, the authors show in mice that that loss of the mitochondrial calcium uniporter (MCU) of alveolar type 2 cells (AT2) impaired mitochondrial Ca2+ buffering and surfactant secretion, and increased mortality, in response to LPS instillation, suggesting the MCU as a potential therapeutic target in ALI.
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