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deWeever A, Paudel SS, Zhou C, Francis CM, Tambe DT, Frank DW, Balczon R, Stevens T. cUMP elicits interendothelial gap formation during Pseudomonas aeruginosa infection. Am J Physiol Lung Cell Mol Physiol 2024; 327:L395-L405. [PMID: 39076085 DOI: 10.1152/ajplung.00164.2023] [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: 05/22/2023] [Revised: 05/08/2024] [Accepted: 06/30/2024] [Indexed: 07/31/2024] Open
Abstract
Pseudomonas aeruginosa utilizes a type 3 secretion system to intoxicate host cells with the nucleotidyl cyclase ExoY. After activation by its host cell cofactor, filamentous actin, ExoY produces purine and pyrimidine cyclic nucleotides, including cAMP, cGMP, and cUMP. ExoY-generated cyclic nucleotides promote interendothelial gap formation, impair motility, and arrest cell growth. The disruptive activities of cAMP and cGMP during the P. aeruginosa infection are established; however, little is known about the function of cUMP. Here, we tested the hypothesis that cUMP contributes to endothelial cell barrier disruption during P. aeruginosa infection. Using a membrane permeable cUMP analog, cUMP-AM, we revealed that during infection with catalytically inactive ExoY, cUMP promotes interendothelial gap formation in cultured pulmonary microvascular endothelial cells (PMVECs) and contributes to increased filtration coefficient in the isolated perfused lung. These findings indicate that cUMP contributes to endothelial permeability during P. aeruginosa lung infection.NEW & NOTEWORTHY During pneumonia, bacteria utilize a virulence arsenal to communicate with host cells. The Pseudomonas aeruginosa T3SS directly introduces virulence molecules into the host cell cytoplasm. These molecules are enzymes that trigger interkingdom communication. One of the exoenzymes is a nucleotidyl cyclase that produces noncanonical cyclic nucleotides like cUMP. Little is known about how cUMP acts in the cell. Here we found that cUMP instigates pulmonary edema during Pseudomonas aeruginosa infection of the lung.
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Grants
- HL66299 HHS | NIH | National Heart, Lung, and Blood Institute (NHLBI)
- HL148069 HHS | NIH | National Heart, Lung, and Blood Institute (NHLBI)
- HL167997 HHS | NIH | National Heart, Lung, and Blood Institute (NHLBI)
- HL140182 HHS | NIH | National Heart, Lung, and Blood Institute (NHLBI)
- AI104922 HHS | NIH | NIAID | Division of Microbiology and Infectious Diseases (DMID)
- HL136689 HHS | NIH | National Heart, Lung, and Blood Institute (NHLBI)
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Affiliation(s)
- Althea deWeever
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Sunita S Paudel
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Chun Zhou
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - C Michael Francis
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Dhananjay T Tambe
- Department of Mechanical, Aerospace and Biomedical Engineering, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Dara W Frank
- Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Center for Infectious Disease Research, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Ron Balczon
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Troy Stevens
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States
- Department of Internal Medicine, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
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2
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Ellis MJ, Lekka C, Holden KL, Tulmin H, Seedat F, O'Brien DP, Dhayal S, Zeissler ML, Knudsen JG, Kessler BM, Morgan NG, Todd JA, Richardson SJ, Stefana MI. Identification of high-performing antibodies for the reliable detection of Tau proteoforms by Western blotting and immunohistochemistry. Acta Neuropathol 2024; 147:87. [PMID: 38761203 PMCID: PMC11102361 DOI: 10.1007/s00401-024-02729-7] [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: 11/07/2023] [Revised: 04/03/2024] [Accepted: 04/03/2024] [Indexed: 05/20/2024]
Abstract
Antibodies are essential research tools whose performance directly impacts research conclusions and reproducibility. Owing to its central role in Alzheimer's disease and other dementias, hundreds of distinct antibody clones have been developed against the microtubule-associated protein Tau and its multiple proteoforms. Despite this breadth of offer, limited understanding of their performance and poor antibody selectivity have hindered research progress. Here, we validate a large panel of Tau antibodies by Western blot (79 reagents) and immunohistochemistry (35 reagents). We address the reagents' ability to detect the target proteoform, selectivity, the impact of protein phosphorylation on antibody binding and performance in human brain samples. While most antibodies detected Tau at high levels, many failed to detect it at lower, endogenous levels. By WB, non-selective binding to other proteins affected over half of the antibodies tested, with several cross-reacting with the related MAP2 protein, whereas the "oligomeric Tau" T22 antibody reacted with monomeric Tau by WB, thus calling into question its specificity to Tau oligomers. Despite the presumption that "total" Tau antibodies are agnostic to post-translational modifications, we found that phosphorylation partially inhibits binding for many such antibodies, including the popular Tau-5 clone. We further combine high-sensitivity reagents, mass-spectrometry proteomics and cDNA sequencing to demonstrate that presumptive Tau "knockout" human cells continue to express residual protein arising through exon skipping, providing evidence of previously unappreciated gene plasticity. Finally, probing of human brain samples with a large panel of antibodies revealed the presence of C-term-truncated versions of all main Tau brain isoforms in both control and tauopathy donors. Ultimately, we identify a validated panel of Tau antibodies that can be employed in Western blotting and/or immunohistochemistry to reliably detect even low levels of Tau expression with high selectivity. This work represents an extensive resource that will enable the re-interpretation of published data, improve reproducibility in Tau research, and overall accelerate scientific progress.
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Affiliation(s)
- Michael J Ellis
- JDRF/Wellcome Diabetes and Inflammation Laboratory, Nuffield Department of Medicine, Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK
| | - Christiana Lekka
- Islet Biology Group, Department of Clinical & Biomedical Sciences, Exeter Centre of Excellence in Diabetes (EXCEED), University of Exeter, RILD Building, Exeter, UK
| | - Katie L Holden
- JDRF/Wellcome Diabetes and Inflammation Laboratory, Nuffield Department of Medicine, Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK
| | - Hanna Tulmin
- JDRF/Wellcome Diabetes and Inflammation Laboratory, Nuffield Department of Medicine, Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK
| | - Faheem Seedat
- JDRF/Wellcome Diabetes and Inflammation Laboratory, Nuffield Department of Medicine, Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK
- Nuffield Department of Women's and Reproductive Health, Women's Centre, University of Oxford, John Radcliffe Hospital, Level 3, Oxford, UK
| | - Darragh P O'Brien
- Target Discovery Institute, Centre for Medicines Discovery, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford, UK
| | - Shalinee Dhayal
- Islet Biology Group, Department of Clinical & Biomedical Sciences, Exeter Centre of Excellence in Diabetes (EXCEED), University of Exeter, RILD Building, Exeter, UK
| | - Marie-Louise Zeissler
- Islet Biology Group, Department of Clinical & Biomedical Sciences, Exeter Centre of Excellence in Diabetes (EXCEED), University of Exeter, RILD Building, Exeter, UK
| | - Jakob G Knudsen
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Department of Medicine, University of Oxford, Radcliffe, UK
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Benedikt M Kessler
- Target Discovery Institute, Centre for Medicines Discovery, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford, UK
| | - Noel G Morgan
- Islet Biology Group, Department of Clinical & Biomedical Sciences, Exeter Centre of Excellence in Diabetes (EXCEED), University of Exeter, RILD Building, Exeter, UK
| | - John A Todd
- JDRF/Wellcome Diabetes and Inflammation Laboratory, Nuffield Department of Medicine, Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK
| | - Sarah J Richardson
- Islet Biology Group, Department of Clinical & Biomedical Sciences, Exeter Centre of Excellence in Diabetes (EXCEED), University of Exeter, RILD Building, Exeter, UK
| | - M Irina Stefana
- JDRF/Wellcome Diabetes and Inflammation Laboratory, Nuffield Department of Medicine, Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK.
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Balczon R, Lin MT, Voth S, Nelson AR, Schupp JC, Wagener BM, Pittet JF, Stevens T. Lung endothelium, tau, and amyloids in health and disease. Physiol Rev 2024; 104:533-587. [PMID: 37561137 PMCID: PMC11281824 DOI: 10.1152/physrev.00006.2023] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 06/26/2023] [Accepted: 08/04/2023] [Indexed: 08/11/2023] Open
Abstract
Lung endothelia in the arteries, capillaries, and veins are heterogeneous in structure and function. Lung capillaries in particular represent a unique vascular niche, with a thin yet highly restrictive alveolar-capillary barrier that optimizes gas exchange. Capillary endothelium surveys the blood while simultaneously interpreting cues initiated within the alveolus and communicated via immediately adjacent type I and type II epithelial cells, fibroblasts, and pericytes. This cell-cell communication is necessary to coordinate the immune response to lower respiratory tract infection. Recent discoveries identify an important role for the microtubule-associated protein tau that is expressed in lung capillary endothelia in the host-pathogen interaction. This endothelial tau stabilizes microtubules necessary for barrier integrity, yet infection drives production of cytotoxic tau variants that are released into the airways and circulation, where they contribute to end-organ dysfunction. Similarly, beta-amyloid is produced during infection. Beta-amyloid has antimicrobial activity, but during infection it can acquire cytotoxic activity that is deleterious to the host. The production and function of these cytotoxic tau and amyloid variants are the subject of this review. Lung-derived cytotoxic tau and amyloid variants are a recently discovered mechanism of end-organ dysfunction, including neurocognitive dysfunction, during and in the aftermath of infection.
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Affiliation(s)
- Ron Balczon
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Mike T Lin
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Sarah Voth
- Department of Cell Biology and Physiology, Edward Via College of Osteopathic Medicine, Monroe, Louisiana, United States
| | - Amy R Nelson
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Jonas C Schupp
- Pulmonary and Critical Care Medicine, Department of Internal Medicine, Yale University, New Haven, Connecticut, United States
- Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
- German Center for Lung Research (DZL), Hannover, Germany
| | - Brant M Wagener
- Department of Anesthesiology and Perioperative Medicine, University of Alabama-Birmingham, Birmingham, Alabama, United States
| | - Jean-Francois Pittet
- Department of Anesthesiology and Perioperative Medicine, University of Alabama-Birmingham, Birmingham, Alabama, United States
| | - Troy Stevens
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States
- Department of Internal Medicine, University of South Alabama, Mobile, Alabama, United States
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
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4
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Renema P, Pittet JF, Brandon AP, Leal SM, Gu S, Promer G, Hackney A, Braswell P, Pickering A, Rafield G, Voth S, Balczon R, Lin MT, Morrow KA, Bell J, Audia JP, Alvarez D, Stevens T, Wagener BM. Tau and Aβ42 in lavage fluid of pneumonia patients are associated with end-organ dysfunction: A prospective exploratory study. PLoS One 2024; 19:e0298816. [PMID: 38394060 PMCID: PMC10889620 DOI: 10.1371/journal.pone.0298816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 01/30/2024] [Indexed: 02/25/2024] Open
Abstract
BACKGROUND Bacterial pneumonia and sepsis are both common causes of end-organ dysfunction, especially in immunocompromised and critically ill patients. Pre-clinical data demonstrate that bacterial pneumonia and sepsis elicit the production of cytotoxic tau and amyloids from pulmonary endothelial cells, which cause lung and brain injury in naïve animal subjects, independent of the primary infection. The contribution of infection-elicited cytotoxic tau and amyloids to end-organ dysfunction has not been examined in the clinical setting. We hypothesized that cytotoxic tau and amyloids are present in the bronchoalveolar lavage fluid of critically ill patients with bacterial pneumonia and that these tau/amyloids are associated with end-organ dysfunction. METHODS Bacterial culture-positive and culture-negative mechanically ventilated patients were recruited into a prospective, exploratory observational study. Levels of tau and Aβ42 in, and cytotoxicity of, the bronchoalveolar lavage fluid were measured. Cytotoxic tau and amyloid concentrations were examined in comparison with patient clinical characteristics, including measures of end-organ dysfunction. RESULTS Tau and Aβ42 were increased in culture-positive patients (n = 49) compared to culture-negative patients (n = 50), independent of the causative bacterial organism. The mean age of patients was 52.1 ± 16.72 years old in the culture-positive group and 52.78 ± 18.18 years old in the culture-negative group. Males comprised 65.3% of the culture-positive group and 56% of the culture-negative group. Caucasian culture-positive patients had increased tau, boiled tau, and Aβ42 compared to both Caucasian and minority culture-negative patients. The increase in cytotoxins was most evident in males of all ages, and their presence was associated with end-organ dysfunction. CONCLUSIONS Bacterial infection promotes the generation of cytotoxic tau and Aβ42 within the lung, and these cytotoxins contribute to end-organ dysfunction among critically ill patients. This work illuminates an unappreciated mechanism of injury in critical illness.
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Affiliation(s)
- Phoibe Renema
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States of America
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States of America
- Department of Biomedical Sciences, University of South Alabama, Mobile, Alabama, United States of America
| | - Jean-Francois Pittet
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Angela P. Brandon
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Sixto M. Leal
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Steven Gu
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Grace Promer
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Andrew Hackney
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Phillip Braswell
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Andrew Pickering
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Grace Rafield
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Sarah Voth
- Department of Cell Biology and Physiology, Edward Via College of Osteopathic Medicine, Monroe, Louisiana, United States of America
| | - Ron Balczon
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States of America
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, Alabama, United States of America
| | - Mike T. Lin
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States of America
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States of America
| | - K. Adam Morrow
- Department of Cell Biology and Physiology, Edward Via College of Osteopathic Medicine, Monroe, Louisiana, United States of America
| | - Jessica Bell
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States of America
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States of America
| | - Jonathon P. Audia
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States of America
- Department of Microbiology and Immunology, University of South Alabama, Mobile, Alabama, United States of America
| | - Diego Alvarez
- Department of Physiology and Pharmacology, Sam Houston State University, Conroe, Texas, United States of America
| | - Troy Stevens
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States of America
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, United States of America
- Department of Internal Medicine, University of South Alabama, Mobile, Alabama, United States of America
| | - Brant M. Wagener
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
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5
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Walker A, Czyz DM. Oh my gut! Is the microbial origin of neurodegenerative diseases real? Infect Immun 2023; 91:e0043722. [PMID: 37750713 PMCID: PMC10580905 DOI: 10.1128/iai.00437-22] [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] [Indexed: 09/27/2023] Open
Abstract
There is no cure or effective treatment for neurodegenerative protein conformational diseases (PCDs), such as Alzheimer's or Parkinson's diseases, mainly because the etiology of these diseases remains elusive. Recent data suggest that unique changes in the gut microbial composition are associated with these ailments; however, our current understanding of the bacterial role in the pathogenesis of PCDs is hindered by the complexity of the microbial communities associated with specific microbiomes, such as the gut, oral, or vaginal microbiota. The composition of these specific microbiomes is regarded as a unique fingerprint affected by factors such as infections, diet, lifestyle, and antibiotics. All of these factors also affect the severity of neurodegenerative diseases. The majority of studies that reveal microbial contribution are correlational, and various models, including worm, fly, and mouse, are being utilized to decipher the role of individual microbes that may affect disease onset and progression. Recent evidence from across model organisms and humans shows a positive correlation between the presence of gram-negative enteropathogenic bacteria and the pathogenesis of PCDs. While these correlational studies do not provide a mechanistic explanation, they do reveal contributing bacterial species and provide an important basis for further investigation. One of the lurking concerns related to the microbial contribution to PCDs is the increasing prevalence of antibiotic resistance and poor antibiotic stewardship, which ultimately select for proteotoxic bacteria, especially the gram-negative species that are known for intrinsic resistance. In this review, we summarize what is known about individual microbial contribution to PCDs and the potential impact of increasing antimicrobial resistance.
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Affiliation(s)
- Alyssa Walker
- Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA
| | - Daniel M. Czyz
- Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA
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Lu J, Liang F, Bai P, Liu C, Xu M, Sun Z, Tian W, Dong Y, Zhang Y, Quan Q, Khatri A, Shen Y, Marcantonio E, Crosby G, Culley D, Wang C, Yang G, Xie Z. Blood tau-PT217 contributes to the anesthesia/surgery-induced delirium-like behavior in aged mice. Alzheimers Dement 2023; 19:4110-4126. [PMID: 37249148 PMCID: PMC10524579 DOI: 10.1002/alz.13118] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 04/07/2023] [Accepted: 04/11/2023] [Indexed: 05/31/2023]
Abstract
INTRODUCTION Blood phosphorylated tau at threonine 217 (tau-PT217) is a newly established biomarker for Alzheimer's disease and postoperative delirium in patients. However, the mechanisms and consequences of acute changes in blood tau-PT217 remain largely unknown. METHODS We investigated the effects of anesthesia/surgery on blood tau-PT217 in aged mice, and evaluated the associated changes in B cell populations, neuronal excitability in anterior cingulate cortex, and delirium-like behavior using positron emission tomography imaging, nanoneedle technology, flow cytometry, electrophysiology, and behavioral tests. RESULTS Anesthesia/surgery induced acute increases in blood tau-PT217 via enhanced generation in the lungs and release from B cells. Tau-PT217 might cross the blood-brain barrier, increasing neuronal excitability and inducing delirium-like behavior. B cell transfer and WS635, a mitochondrial function enhancer, mitigated the anesthesia/surgery-induced changes. DISCUSSION Acute increases in blood tau-PT217 may contribute to brain dysfunction and postoperative delirium. Targeting B cells or mitochondrial function may have therapeutic potential for preventing or treating these conditions.
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Affiliation(s)
- Jing Lu
- Department of Anesthesiology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan, 610072, China
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
| | - Feng Liang
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
| | - Ping Bai
- Targeted Tracer Research and Development Laboratory, Precision Medicine Key Laboratory of Sichuan Province & Precision Medicine Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041, China
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
| | - Chenghao Liu
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
- Chinese Academy of Sciences, Institute of Automation, Beijing, 100080, China
| | - Miao Xu
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
- Department of Anesthesiology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, 510120, China
| | - Zhengwang Sun
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
| | - Wenjie Tian
- Department of Cardiology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan, 610072, China
- Cardiovascular Research Center and Cardiology Division of the Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
| | - Yuanlin Dong
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
| | - Yiying Zhang
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
| | - Qimin Quan
- NanoMosaic, Inc., Woburn, MA, 01801, United States
| | - Ashok Khatri
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, 02129, United States
| | - Yuan Shen
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
- Anesthesia and Brain Research Institute, Tongji University School of Medicine, Shanghai, 200092, China
- Mental Health Center affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China
| | - Edward Marcantonio
- Divisions of General Medicine and Primary Care and Gerontology, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, 02115, United States
| | - Gregory Crosby
- Department of Anesthesiology, Brigham & Women’s Hospital and Harvard Medical School, Boston, MA, 02115, United States
| | - Deborah Culley
- Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania Health System, Philadelphia, PA, 19104, United States
| | - Changning Wang
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
| | - Guang Yang
- Department of Anesthesiology, Columbia University Medical Center, New York, NY, 10032, United States
| | - Zhongcong Xie
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, United States
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7
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Lee JY, Stevens RP, Pastukh VV, Pastukh VM, Kozhukhar N, Alexeyev MF, Reisz JA, Nerguizian D, D’Alessandro A, Koloteva A, Gwin MS, Roberts JT, Borchert GM, Wagener BM, Pittet JF, Graham BB, Stenmark KR, Stevens T. PFKFB3 Inhibits Fructose Metabolism in Pulmonary Microvascular Endothelial Cells. Am J Respir Cell Mol Biol 2023; 69:340-354. [PMID: 37201952 PMCID: PMC10503305 DOI: 10.1165/rcmb.2022-0443oc] [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: 11/13/2022] [Accepted: 05/17/2023] [Indexed: 05/20/2023] Open
Abstract
Pulmonary microvascular endothelial cells contribute to the integrity of the lung gas exchange interface, and they are highly glycolytic. Although glucose and fructose represent discrete substrates available for glycolysis, pulmonary microvascular endothelial cells prefer glucose over fructose, and the mechanisms involved in this selection are unknown. 6-Phosphofructo-2-kinase/fructose-2, 6-bisphosphatase 3 (PFKFB3) is an important glycolytic enzyme that drives glycolytic flux against negative feedback and links glycolytic and fructolytic pathways. We hypothesized that PFKFB3 inhibits fructose metabolism in pulmonary microvascular endothelial cells. We found that PFKFB3 knockout cells survive better than wild-type cells in fructose-rich medium under hypoxia. Seahorse assays, lactate and glucose measurements, and stable isotope tracing showed that PFKFB3 inhibits fructose-hexokinase-mediated glycolysis and oxidative phosphorylation. Microarray analysis revealed that fructose upregulates PFKFB3, and PFKFB3 knockout cells increase fructose-specific GLUT5 (glucose transporter 5) expression. Using conditional endothelial-specific PFKFB3 knockout mice, we demonstrated that endothelial PFKFB3 knockout increases lung tissue lactate production after fructose gavage. Last, we showed that pneumonia increases fructose in BAL fluid in mechanically ventilated ICU patients. Thus, PFKFB3 knockout increases GLUT5 expression and the hexokinase-mediated fructose use in pulmonary microvascular endothelial cells that promotes their survival. Our findings indicate that PFKFB3 is a molecular switch that controls glucose versus fructose use in glycolysis and help better understand lung endothelial cell metabolism during respiratory failure.
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Affiliation(s)
- Ji Young Lee
- Department of Physiology and Cell Biology
- Division of Pulmonary and Critical Care Medicine
- Department of Internal Medicine
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Reece P. Stevens
- Department of Physiology and Cell Biology
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Viktoriya V. Pastukh
- Department of Physiology and Cell Biology
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Viktor M. Pastukh
- Department of Pharmacology, and
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Natalya Kozhukhar
- Department of Physiology and Cell Biology
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Mikhail F. Alexeyev
- Department of Physiology and Cell Biology
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | | | | | | | - Anna Koloteva
- Department of Physiology and Cell Biology
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Meredith S. Gwin
- Department of Physiology and Cell Biology
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Justin T. Roberts
- Department of Pharmacology, and
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Glen M. Borchert
- Department of Pharmacology, and
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Brant M. Wagener
- Division of Critical Care Medicine, Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and
| | - Jean-François Pittet
- Division of Critical Care Medicine, Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and
| | - Brian B. Graham
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Lung Biology Center, University of California, San Francisco, San Francisco, California
| | - Kurt R. Stenmark
- Cardiovascular Pulmonary Research Laboratories, Department of Pediatrics and
- Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Troy Stevens
- Department of Physiology and Cell Biology
- Department of Internal Medicine
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, Alabama
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8
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Gwin MS, Alexeyev MF, Geurts AM, Lee JY, Zhou C, Yang XM, Cohen MV, Downey JM, Barrington RA, Spadafora D, Audia JP, Frank DW, Voth S, Pastukh VV, Bell J, Ayers L, Tambe DT, Nelson AR, Balczon R, Lin MT, Stevens T. Gamma secretase activating protein promotes end-organ dysfunction after bacterial pneumonia. Am J Physiol Lung Cell Mol Physiol 2023; 325:L174-L189. [PMID: 37366533 PMCID: PMC10396227 DOI: 10.1152/ajplung.00018.2023] [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: 01/13/2023] [Revised: 06/20/2023] [Accepted: 06/20/2023] [Indexed: 06/28/2023] Open
Abstract
Pneumonia elicits the production of cytotoxic beta amyloid (Aβ) that contributes to end-organ dysfunction, yet the mechanism(s) linking infection to activation of the amyloidogenic pathway that produces cytotoxic Aβ is unknown. Here, we tested the hypothesis that gamma-secretase activating protein (GSAP), which contributes to the amyloidogenic pathway in the brain, promotes end-organ dysfunction following bacterial pneumonia. First-in-kind Gsap knockout rats were generated. Wild-type and knockout rats possessed similar body weights, organ weights, circulating blood cell counts, arterial blood gases, and cardiac indices at baseline. Intratracheal Pseudomonas aeruginosa infection caused acute lung injury and a hyperdynamic circulatory state. Whereas infection led to arterial hypoxemia in wild-type rats, the alveolar-capillary barrier integrity was preserved in Gsap knockout rats. Infection potentiated myocardial infarction following ischemia-reperfusion injury, and this potentiation was abolished in knockout rats. In the hippocampus, GSAP contributed to both pre- and postsynaptic neurotransmission, increasing the presynaptic action potential recruitment, decreasing neurotransmitter release probability, decreasing the postsynaptic response, and preventing postsynaptic hyperexcitability, resulting in greater early long-term potentiation but reduced late long-term potentiation. Infection abolished early and late long-term potentiation in wild-type rats, whereas the late long-term potentiation was partially preserved in Gsap knockout rats. Furthermore, hippocampi from knockout rats, and both the wild-type and knockout rats following infection, exhibited a GSAP-dependent increase in neurotransmitter release probability and postsynaptic hyperexcitability. These results elucidate an unappreciated role for GSAP in innate immunity and highlight the contribution of GSAP to end-organ dysfunction during infection.NEW & NOTEWORTHY Pneumonia is a common cause of end-organ dysfunction, both during and in the aftermath of infection. In particular, pneumonia is a common cause of lung injury, increased risk of myocardial infarction, and neurocognitive dysfunction, although the mechanisms responsible for such increased risk are unknown. Here, we reveal that gamma-secretase activating protein, which contributes to the amyloidogenic pathway, is important for end-organ dysfunction following infection.
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Affiliation(s)
- Meredith S Gwin
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Mikhail F Alexeyev
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Aron M Geurts
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Ji Young Lee
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Chun Zhou
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Xi-Ming Yang
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Michael V Cohen
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - James M Downey
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Robert A Barrington
- Department of Microbiology and Immunology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Domenico Spadafora
- Department of Microbiology and Immunology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Jonathon P Audia
- Department of Microbiology and Immunology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Dara W Frank
- Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Sarah Voth
- Department of Cell Biology and Physiology, Edward Via College of Osteopathic Medicine, Monroe, Louisiana, United States
| | - Viktoriya V Pastukh
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Jessica Bell
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Linn Ayers
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Dhananjay T Tambe
- Department of Mechanical, Aerospace, and Biomedical Engineering, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Amy R Nelson
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Ron Balczon
- Department of Biochemistry and Molecular Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Mike T Lin
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
| | - Troy Stevens
- Department of Physiology and Cell Biology, Center for Lung Biology, University of South Alabama, Mobile, Alabama, United States
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9
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Balczon R, Choi CS, deWeever A, Zhou C, Gwin MS, Kolb C, Francis CM, Lin MT, Stevens T. Infection promotes Ser-214 phosphorylation important for generation of cytotoxic tau variants. FASEB J 2023; 37:e23042. [PMID: 37358817 DOI: 10.1096/fj.202300620rr] [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: 03/31/2023] [Revised: 06/02/2023] [Accepted: 06/07/2023] [Indexed: 06/27/2023]
Abstract
Patients who recover from hospital-acquired pneumonia exhibit a high incidence of end-organ dysfunction following hospital discharge, including cognitive deficits. We have previously demonstrated that pneumonia induces the production and release of cytotoxic oligomeric tau from pulmonary endothelial cells, and these tau oligomers can enter the circulation and may be a cause of long-term morbidities. Endothelial-derived oligomeric tau is hyperphosphorylated during infection. The purpose of these studies was to determine whether Ser-214 phosphorylation of tau is a necessary stimulus for generation of cytotoxic tau variants. The results of these studies demonstrate that Ser-214 phosphorylation is critical for the cytotoxic properties of infection-induced oligomeric tau. In the lung, Ser-214 phosphorylated tau contributes to disruption of the alveolar-capillary barrier, resulting in increased permeability. However, in the brain, both the Ser-214 phosphorylated tau and the mutant Ser-214-Ala tau, which cannot be phosphorylated, disrupted hippocampal long-term potentiation suggesting that inhibition of long-term potentiation was relatively insensitive to the phosphorylation status of Ser-214. Nonetheless, phosphorylation of tau is essential to its cytotoxicity since global dephosphorylation of the infection-induced cytotoxic tau variants rescued long-term potentiation. Collectively, these data demonstrate that multiple forms of oligomeric tau are generated during infectious pneumonia, with different forms of oligomeric tau being responsible for dysfunction of distinct end-organs during pneumonia.
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Affiliation(s)
- Ron Balczon
- Department of Biochemistry and Molecular Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Chung-Sik Choi
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Althea deWeever
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Chun Zhou
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Meredith S Gwin
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Claire Kolb
- Department of Biochemistry and Molecular Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - C Michael Francis
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Mike T Lin
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Troy Stevens
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
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10
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Arbov E, Tayara A, Wu S, Rich TC, Wagener BM. COVID-19 and Long-Term Outcomes: Lessons from Other Critical Care Illnesses and Potential Mechanisms. Am J Respir Cell Mol Biol 2022; 67:275-283. [PMID: 35348443 PMCID: PMC9447134 DOI: 10.1165/rcmb.2021-0374ps] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 03/28/2022] [Indexed: 01/08/2023] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a novel coronavirus that is currently causing a pandemic and has been termed coronavirus disease (COVID-19). The elderly or those with preexisting conditions like diabetes, hypertension, coronary heart disease, chronic obstructive pulmonary disease, cerebrovascular disease, or kidney dysfunction are more likely to develop severe cases when infected. Patients with COVID-19 admitted to the ICU have higher mortality than non-ICU patients. Critical illness has consistently posed a challenge not only in terms of mortality but also in regard to long-term outcomes of survivors. Patients who survive acute critical illness including, but not limited to, pulmonary and systemic insults associated with acute respiratory distress syndrome, pneumonia, systemic inflammation, and mechanical ventilation, will likely suffer from post-ICU syndrome, a phenomenon of cognitive, psychiatric, and/or physical disability after treatment in the ICU. Post-ICU morbidity and mortality continue to be a cause for concern when considering large-scale studies showing 12-month mortality risks of 11.8-21%. Previous studies have demonstrated that multiple mechanisms, including cytokine release, mitochondrial dysfunction, and even amyloids, may lead to end-organ dysfunction in patients. We hypothesize that COVID-19 infection will lead to post-ICU syndrome via potentially similar mechanisms as other chronic critical illnesses and cause long-term morbidity and mortality in patients. We consider a variety of mechanisms and questions that not only consider the short-term impact of the COVID-19 pandemic but its long-term effects that may not yet be imagined.
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Affiliation(s)
- Eli Arbov
- Morehouse School of Medicine, Atlanta, Georgia
| | - Alia Tayara
- Department of Biomedical Sciences
- Honors College
| | - Songwei Wu
- Divisions of Molecular and Translational Biomedicine and
| | - Thomas C. Rich
- Department of Pharmacology, and
- Center for Lung Biology, University of South Alabama, Mobile, Alabama; and
| | - Brant M. Wagener
- Divisions of Molecular and Translational Biomedicine and
- Critical Care Medicine, Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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11
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Martin TR, Zemans RL, Ware LB, Schmidt EP, Riches DWH, Bastarache L, Calfee CS, Desai TJ, Herold S, Hough CL, Looney MR, Matthay MA, Meyer N, Parikh SM, Stevens T, Thompson BT. New Insights into Clinical and Mechanistic Heterogeneity of the Acute Respiratory Distress Syndrome: Summary of the Aspen Lung Conference 2021. Am J Respir Cell Mol Biol 2022; 67:284-308. [PMID: 35679511 PMCID: PMC9447141 DOI: 10.1165/rcmb.2022-0089ws] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 06/09/2022] [Indexed: 12/15/2022] Open
Abstract
Clinical and molecular heterogeneity are common features of human disease. Understanding the basis for heterogeneity has led to major advances in therapy for many cancers and pulmonary diseases such as cystic fibrosis and asthma. Although heterogeneity of risk factors, disease severity, and outcomes in survivors are common features of the acute respiratory distress syndrome (ARDS), many challenges exist in understanding the clinical and molecular basis for disease heterogeneity and using heterogeneity to tailor therapy for individual patients. This report summarizes the proceedings of the 2021 Aspen Lung Conference, which was organized to review key issues related to understanding clinical and molecular heterogeneity in ARDS. The goals were to review new information about ARDS phenotypes, to explore multicellular and multisystem mechanisms responsible for heterogeneity, and to review how best to account for clinical and molecular heterogeneity in clinical trial design and assessment of outcomes. The report concludes with recommendations for future research to understand the clinical and basic mechanisms underlying heterogeneity in ARDS to advance the development of new treatments for this life-threatening critical illness.
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Affiliation(s)
- Thomas R. Martin
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, University of Washington, Seattle, Washington
| | - Rachel L. Zemans
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Program in Cellular and Molecular Biology, University of Michigan School of Medicine, Ann Arbor, Michigan
| | - Lorraine B. Ware
- Division of Allergy, Pulmonary, and Critical Care Medicine, Department of Medicine and
- Division of Allergy, Pulmonary, and Critical Care Medicine, Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Eric P. Schmidt
- Division of Pulmonary Sciences and Critical Care, Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado
| | - David W. H. Riches
- Division of Pulmonary Sciences and Critical Care, Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado
- Program in Cell Biology, Department of Pediatrics, National Jewish Health, Denver, Colorado
| | - Lisa Bastarache
- Department of Biomedical Informatics, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Carolyn S. Calfee
- Division of Pulmonary, Critical Care, Allergy, and Sleep Medicine, Department of Medicine
- Division of Pulmonary, Critical Care, Allergy, and Sleep Medicine, Department of Anesthesia
| | - Tushar J. Desai
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Stem Cell Institute, Stanford University School of Medicine, Stanford, California
| | - Susanne Herold
- Department of Internal Medicine VI and Cardio-Pulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany
| | - Catherine L. Hough
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Oregon Health & Science University, Portland, Oregon
| | | | - Michael A. Matthay
- Departments of Medicine and Anesthesia, Cardiovascular Research Institute, University of California San Francisco, San Francisco, California
| | - Nuala Meyer
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Samir M. Parikh
- Center for Vascular Biology Research, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
- Division of Nephrology, University of Texas Southwestern, Dallas, Texas
| | - Troy Stevens
- Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, Alabama; and
| | - B. Taylor Thompson
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts
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12
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Saiyasit N, Butlig EAR, Chaney SD, Traylor MK, Hawley NA, Randall RB, Bobinger HV, Frizell CA, Trimm F, Crook ED, Lin M, Hill BD, Keller JL, Nelson AR. Neurovascular Dysfunction in Diverse Communities With Health Disparities-Contributions to Dementia and Alzheimer's Disease. Front Neurosci 2022; 16:915405. [PMID: 35844216 PMCID: PMC9279126 DOI: 10.3389/fnins.2022.915405] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 05/31/2022] [Indexed: 12/13/2022] Open
Abstract
Alzheimer's disease and related dementias (ADRD) are an expanding worldwide crisis. In the absence of scientific breakthroughs, the global prevalence of ADRD will continue to increase as more people are living longer. Racial or ethnic minority groups have an increased risk and incidence of ADRD and have often been neglected by the scientific research community. There is mounting evidence that vascular insults in the brain can initiate a series of biological events leading to neurodegeneration, cognitive impairment, and ADRD. We are a group of researchers interested in developing and expanding ADRD research, with an emphasis on vascular contributions to dementia, to serve our local diverse community. Toward this goal, the primary objective of this review was to investigate and better understand health disparities in Alabama and the contributions of the social determinants of health to those disparities, particularly in the context of vascular dysfunction in ADRD. Here, we explain the neurovascular dysfunction associated with Alzheimer's disease (AD) as well as the intrinsic and extrinsic risk factors contributing to dysfunction of the neurovascular unit (NVU). Next, we ascertain ethnoregional health disparities of individuals living in Alabama, as well as relevant vascular risk factors linked to AD. We also discuss current pharmaceutical and non-pharmaceutical treatment options for neurovascular dysfunction, mild cognitive impairment (MCI) and AD, including relevant studies and ongoing clinical trials. Overall, individuals in Alabama are adversely affected by social and structural determinants of health leading to health disparities, driven by rurality, ethnic minority status, and lower socioeconomic status (SES). In general, these communities have limited access to healthcare and healthy food and other amenities resulting in decreased opportunities for early diagnosis of and pharmaceutical treatments for ADRD. Although this review is focused on the current state of health disparities of ADRD patients in Alabama, future studies must include diversity of race, ethnicity, and region to best be able to treat all individuals affected by ADRD.
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Affiliation(s)
- Napatsorn Saiyasit
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, United States
| | - Evan-Angelo R. Butlig
- Department of Neurology, Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, Intellectual and Developmental Disabilities Research Center, University of California, Los Angeles, Los Angeles, CA, United States
| | - Samantha D. Chaney
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, United States
| | - Miranda K. Traylor
- Department of Health, Kinesiology, and Sport, University of South Alabama, Mobile, AL, United States
| | - Nanako A. Hawley
- Department of Psychology, University of South Alabama, Mobile, AL, United States
| | - Ryleigh B. Randall
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, United States
| | - Hanna V. Bobinger
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, United States
| | - Carl A. Frizell
- Department of Physician Assistant Studies, University of South Alabama, Mobile, AL, United States
| | - Franklin Trimm
- College of Medicine, University of South Alabama, Mobile, AL, United States
| | - Errol D. Crook
- Department of Internal Medicine, College of Medicine, University of South Alabama, Mobile, AL, United States
| | - Mike Lin
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, United States
| | - Benjamin D. Hill
- Department of Psychology, University of South Alabama, Mobile, AL, United States
| | - Joshua L. Keller
- Department of Health, Kinesiology, and Sport, University of South Alabama, Mobile, AL, United States
| | - Amy R. Nelson
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, United States
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13
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Teixeira-Nunes M, Retailleau P, Comisso M, Deruelle V, Mechold U, Renault L. Bacterial Nucleotidyl Cyclases Activated by Calmodulin or Actin in Host Cells: Enzyme Specificities and Cytotoxicity Mechanisms Identified to Date. Int J Mol Sci 2022; 23:ijms23126743. [PMID: 35743184 PMCID: PMC9223806 DOI: 10.3390/ijms23126743] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Revised: 06/10/2022] [Accepted: 06/13/2022] [Indexed: 02/06/2023] Open
Abstract
Many pathogens manipulate host cell cAMP signaling pathways to promote their survival and proliferation. Bacterial Exoenzyme Y (ExoY) toxins belong to a family of invasive, structurally-related bacterial nucleotidyl cyclases (NC). Inactive in bacteria, they use proteins that are uniquely and abundantly present in eukaryotic cells to become potent, unregulated NC enzymes in host cells. Other well-known members of the family include Bacillus anthracis Edema Factor (EF) and Bordetella pertussis CyaA. Once bound to their eukaryotic protein cofactor, they can catalyze supra-physiological levels of various cyclic nucleotide monophosphates in infected cells. Originally identified in Pseudomonas aeruginosa, ExoY-related NC toxins appear now to be more widely distributed among various γ- and β-proteobacteria. ExoY-like toxins represent atypical, poorly characterized members within the NC toxin family. While the NC catalytic domains of EF and CyaA toxins use both calmodulin as cofactor, their counterparts in ExoY-like members from pathogens of the genus Pseudomonas or Vibrio use actin as a potent cofactor, in either its monomeric or polymerized form. This is an original subversion of actin for cytoskeleton-targeting toxins. Here, we review recent advances on the different members of the NC toxin family to highlight their common and distinct functional characteristics at the molecular, cytotoxic and enzymatic levels, and important aspects that need further characterizations.
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Affiliation(s)
- Magda Teixeira-Nunes
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Saclay, 91198 Gif-sur-Yvette, France; (M.T.-N.); (M.C.)
| | - Pascal Retailleau
- Institut de Chimie des Substances Naturelles (ICSN), CNRS-UPR2301, Université Paris-Saclay, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette, France;
| | - Martine Comisso
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Saclay, 91198 Gif-sur-Yvette, France; (M.T.-N.); (M.C.)
| | - Vincent Deruelle
- Unité de Biochimie des Interactions Macromoléculaires, Département de Biologie Structurale et Chimie, CNRS UMR 3528, Institut Pasteur, 75015 Paris, France; (V.D.); (U.M.)
| | - Undine Mechold
- Unité de Biochimie des Interactions Macromoléculaires, Département de Biologie Structurale et Chimie, CNRS UMR 3528, Institut Pasteur, 75015 Paris, France; (V.D.); (U.M.)
| | - Louis Renault
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Saclay, 91198 Gif-sur-Yvette, France; (M.T.-N.); (M.C.)
- Correspondence:
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14
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Walker AC, Bhargava R, Dove AS, Brust AS, Owji AA, Czyż DM. Bacteria-Derived Protein Aggregates Contribute to the Disruption of Host Proteostasis. Int J Mol Sci 2022; 23:4807. [PMID: 35563197 PMCID: PMC9103901 DOI: 10.3390/ijms23094807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 04/14/2022] [Accepted: 04/24/2022] [Indexed: 12/10/2022] Open
Abstract
Neurodegenerative protein conformational diseases are characterized by the misfolding and aggregation of metastable proteins encoded within the host genome. The host is also home to thousands of proteins encoded within exogenous genomes harbored by bacteria, fungi, and viruses. Yet, their contributions to host protein-folding homeostasis, or proteostasis, remain elusive. Recent studies, including our previous work, suggest that bacterial products contribute to the toxic aggregation of endogenous host proteins. We refer to these products as bacteria-derived protein aggregates (BDPAs). Furthermore, antibiotics were recently associated with an increased risk for neurodegenerative diseases, including Parkinson's disease and amyotrophic lateral sclerosis-possibly by virtue of altering the composition of the human gut microbiota. Other studies have shown a negative correlation between disease progression and antibiotic administration, supporting their protective effect against neurodegenerative diseases. These contradicting studies emphasize the complexity of the human gut microbiota, the gut-brain axis, and the effect of antibiotics. Here, we further our understanding of bacteria's effect on host protein folding using the model Caenorhabditis elegans. We employed genetic and chemical methods to demonstrate that the proteotoxic effect of bacteria on host protein folding correlates with the presence of BDPAs. Furthermore, the abundance and proteotoxicity of BDPAs are influenced by gentamicin, an aminoglycoside antibiotic that induces protein misfolding, and by butyrate, a short-chain fatty acid that we previously found to affect host protein aggregation and the associated toxicity. Collectively, these results increase our understanding of host-bacteria interactions in the context of protein conformational diseases.
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Affiliation(s)
| | | | | | | | | | - Daniel M. Czyż
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, USA; (A.C.W.); (R.B.); (A.S.D.); (A.S.B.); (A.A.O.)
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15
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Nelson AR. Peripheral Pathways to Neurovascular Unit Dysfunction, Cognitive Impairment, and Alzheimer’s Disease. Front Aging Neurosci 2022; 14:858429. [PMID: 35517047 PMCID: PMC9062225 DOI: 10.3389/fnagi.2022.858429] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/03/2022] [Indexed: 12/11/2022] Open
Abstract
Alzheimer’s disease (AD) is the most common form of dementia. It was first described more than a century ago, and scientists are acquiring new data and learning novel information about the disease every day. Although there are nuances and details continuously being unraveled, many key players were identified in the early 1900’s by Dr. Oskar Fischer and Dr. Alois Alzheimer, including amyloid-beta (Aβ), tau, vascular abnormalities, gliosis, and a possible role of infections. More recently, there has been growing interest in and appreciation for neurovascular unit dysfunction that occurs early in mild cognitive impairment (MCI) before and independent of Aβ and tau brain accumulation. In the last decade, evidence that Aβ and tau oligomers are antimicrobial peptides generated in response to infection has expanded our knowledge and challenged preconceived notions. The concept that pathogenic germs cause infections generating an innate immune response (e.g., Aβ and tau produced by peripheral organs) that is associated with incident dementia is worthwhile considering in the context of sporadic AD with an unknown root cause. Therefore, the peripheral amyloid hypothesis to cognitive impairment and AD is proposed and remains to be vetted by future research. Meanwhile, humans remain complex variable organisms with individual risk factors that define their immune status, neurovascular function, and neuronal plasticity. In this focused review, the idea that infections and organ dysfunction contribute to Alzheimer’s disease, through the generation of peripheral amyloids and/or neurovascular unit dysfunction will be explored and discussed. Ultimately, many questions remain to be answered and critical areas of future exploration are highlighted.
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16
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Hardy KS, Tessmer MH, Frank DW, Audia JP. Perspectives on the Pseudomonas aeruginosa Type III Secretion System Effector ExoU and Its Subversion of the Host Innate Immune Response to Infection. Toxins (Basel) 2021; 13:880. [PMID: 34941717 PMCID: PMC8708460 DOI: 10.3390/toxins13120880] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 11/19/2021] [Accepted: 12/04/2021] [Indexed: 12/02/2022] Open
Abstract
Pseudomonas aeruginosa is an opportunistic, Gram-negative pathogen and an important cause of hospital acquired infections, especially in immunocompromised patients. Highly virulent P. aeruginosa strains use a type III secretion system (T3SS) to inject exoenzyme effectors directly into the cytoplasm of a target host cell. P. aeruginosa strains that express the T3SS effector, ExoU, associate with adverse outcomes in critically ill patients with pneumonia, owing to the ability of ExoU to rapidly damage host cell membranes and subvert the innate immune response to infection. Herein, we review the structure, function, regulation, and virulence characteristics of the T3SS effector ExoU, a highly cytotoxic phospholipase A2 enzyme.
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Affiliation(s)
- Kierra S. Hardy
- Department of Microbiology and Immunology, University of South Alabama College of Medicine, Mobile, AL 36608, USA;
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, AL 36608, USA
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Maxx H. Tessmer
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA;
| | - Dara W. Frank
- Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Jonathon P. Audia
- Department of Microbiology and Immunology, University of South Alabama College of Medicine, Mobile, AL 36608, USA;
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, AL 36608, USA
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17
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Cytotoxic tau released from lung microvascular endothelial cells upon infection with Pseudomonas aeruginosa promotes neuronal tauopathy. J Biol Chem 2021; 298:101482. [PMID: 34896150 PMCID: PMC8718960 DOI: 10.1016/j.jbc.2021.101482] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 12/02/2021] [Accepted: 12/03/2021] [Indexed: 11/23/2022] Open
Abstract
Patients who recover from nosocomial pneumonia oftentimes exhibit long-lasting cognitive impairment comparable with what is observed in Alzheimer’s disease patients. We previously hypothesized that the lung endothelium contributes to infection-related neurocognitive dysfunction, because bacteria-exposed endothelial cells release a form(s) of cytotoxic tau that is sufficient to impair long-term potentiation in the hippocampus. However, the full-length lung and endothelial tau isoform(s) have yet to be resolved and it remains unclear whether the infection-induced endothelial cytotoxic tau triggers neuronal tau aggregation. Here, we demonstrate that lung endothelial cells express a big tau isoform and three additional tau isoforms that are similar to neuronal tau, each containing four microtubule-binding repeat domains, and that tau is expressed in lung capillaries in vivo. To test whether infection elicits endothelial tau capable of causing transmissible tau aggregation, the cells were infected with Pseudomonas aeruginosa. The infection-induced tau released from endothelium into the medium-induced neuronal tau aggregation in reporter cells, including reporter cells that express either the four microtubule-binding repeat domains or the full-length tau. Infection-induced release of pathological tau variant(s) from endothelium, and the ability of the endothelial-derived tau to cause neuronal tau aggregation, was abolished in tau knockout cells. After bacterial lung infection, brain homogenates from WT mice, but not from tau knockout mice, initiated tau aggregation. Thus, we conclude that bacterial pneumonia initiates the release of lung endothelial-derived cytotoxic tau, which is capable of propagating a neuronal tauopathy.
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18
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Balczon R, Lin MT, Lee JY, Abbasi A, Renema P, Voth SB, Zhou C, Koloteva A, Michael Francis C, Sodha NR, Pittet JF, Wagener BM, Bell J, Choi CS, Ventetuolo CE, Stevens T. Pneumonia initiates a tauopathy. FASEB J 2021; 35:e21807. [PMID: 34384141 PMCID: PMC8443149 DOI: 10.1096/fj.202100718r] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 06/30/2021] [Accepted: 07/06/2021] [Indexed: 12/11/2022]
Abstract
Pneumonia causes short‐ and long‐term cognitive dysfunction in a high proportion of patients, although the mechanism(s) responsible for this effect are unknown. Here, we tested the hypothesis that pneumonia‐elicited cytotoxic amyloid and tau variants: (1) are present in the circulation during infection; (2) lead to impairment of long‐term potentiation; and, (3) inhibit long‐term potentiation dependent upon tau. Cytotoxic amyloid and tau species were recovered from the blood and the hippocampus following pneumonia, and they were present in the extracorporeal membrane oxygenation oxygenators of patients with pneumonia, especially in those who died. Introduction of immunopurified blood‐borne amyloid and tau into either the airways or the blood of uninfected animals acutely and chronically impaired hippocampal information processing. In contrast, the infection did not impair long‐term potentiation in tau knockout mice and the amyloid‐ and tau‐dependent disruption in hippocampal signaling was less severe in tau knockout mice. Moreover, the infection did not elicit cytotoxic amyloid and tau variants in tau knockout mice. Therefore, pneumonia initiates a tauopathy that contributes to cognitive dysfunction.
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Affiliation(s)
- Ron Balczon
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, AL, USA.,Center for Lung Biology, University of South Alabama, Mobile, AL, USA
| | - Mike T Lin
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA
| | - Ji Young Lee
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Internal Medicine, University of South Alabama, Mobile, AL, USA
| | - Adeel Abbasi
- Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Alpert Medical School of Brown University, Providence, RI, USA
| | - Phoibe Renema
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA
| | - Sarah B Voth
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA
| | - Chun Zhou
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA
| | - Anna Koloteva
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA
| | - C Michael Francis
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA
| | - Neel R Sodha
- Department of Surgery, Brown University, Providence, RI, USA
| | - Jean-Francois Pittet
- Department of Anesthesiology and Perioperative Medicine, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Brant M Wagener
- Department of Anesthesiology and Perioperative Medicine, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Jessica Bell
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA
| | - Chung-Sik Choi
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA
| | - Corey E Ventetuolo
- Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Alpert Medical School of Brown University, Providence, RI, USA.,Health Services, Policy and Practice, Brown University School of Public Health, Providence, RI, USA
| | - Troy Stevens
- Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Department of Physiology and Cell Biology, College of Medicine, Center for Lung Biology, University of South Alabama, Mobile, AL, USA.,Internal Medicine, University of South Alabama, Mobile, AL, USA
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19
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Qiu C, Albayram O, Kondo A, Wang B, Kim N, Arai K, Tsai CY, Bassal MA, Herbert MK, Washida K, Angeli P, Kozono S, Stucky JE, Baxley S, Lin YM, Sun Y, Rotenberg A, Caldarone BJ, Bigio EH, Chen X, Tenen DG, Zeidel M, Lo EH, Zhou XZ, Lu KP. Cis P-tau underlies vascular contribution to cognitive impairment and dementia and can be effectively targeted by immunotherapy in mice. Sci Transl Med 2021; 13:13/596/eaaz7615. [PMID: 34078745 DOI: 10.1126/scitranslmed.aaz7615] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 08/14/2020] [Accepted: 03/26/2021] [Indexed: 01/02/2023]
Abstract
Compelling evidence supports vascular contributions to cognitive impairment and dementia (VCID) including Alzheimer's disease (AD), but the underlying pathogenic mechanisms and treatments are not fully understood. Cis P-tau is an early driver of neurodegeneration resulting from traumatic brain injury, but its role in VCID remains unclear. Here, we found robust cis P-tau despite no tau tangles in patients with VCID and in mice modeling key aspects of clinical VCID, likely because of the inhibition of its isomerase Pin1 by DAPK1. Elimination of cis P-tau in VCID mice using cis-targeted immunotherapy, brain-specific Pin1 overexpression, or DAPK1 knockout effectively rescues VCID-like neurodegeneration and cognitive impairment in executive function. Cis mAb also prevents and ameliorates progression of AD-like neurodegeneration and memory loss in mice. Furthermore, single-cell RNA sequencing revealed that young VCID mice display diverse cortical cell type-specific transcriptomic changes resembling old patients with AD, and the vast majority of these global changes were recovered by cis-targeted immunotherapy. Moreover, purified soluble cis P-tau was sufficient to induce progressive neurodegeneration and brain dysfunction by causing axonopathy and conserved transcriptomic signature found in VCID mice and patients with AD with early pathology. Thus, cis P-tau might play a major role in mediating VCID and AD, and antibody targeting it may be useful for early diagnosis, prevention, and treatment of cognitive impairment and dementia after neurovascular insults and in AD.
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Affiliation(s)
- Chenxi Qiu
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Onder Albayram
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Division of Cardiology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Asami Kondo
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Bin Wang
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Nami Kim
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Ken Arai
- Departments of Radiology and Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA
| | - Cheng-Yu Tsai
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Mahmoud A Bassal
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Science Institute of Singapore, National University of Singapore, Singapore 117599, Singapore.,Harvard Stem Cell Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Megan K Herbert
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Kazuo Washida
- Departments of Radiology and Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA
| | - Peter Angeli
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Shingo Kozono
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Joseph E Stucky
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Sean Baxley
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Yu-Min Lin
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Yan Sun
- Department of Neurology, Children's Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
| | - Alexander Rotenberg
- Department of Neurology, Children's Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
| | - Barbara J Caldarone
- NeuroBehavior Laboratory, Harvard NeuroDiscovery Center, Harvard Medical School, Boston, MA 02115, USA
| | - Eileen H Bigio
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Xiaochun Chen
- Fujian Key Laboratory of Molecular Neurology, Fujian Medical University Union Hospital, Fuzhou, Fujian 350001, China
| | - Daniel G Tenen
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Science Institute of Singapore, National University of Singapore, Singapore 117599, Singapore.,Harvard Stem Cell Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Mark Zeidel
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Eng H Lo
- Departments of Radiology and Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA
| | - Xiao Zhen Zhou
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA. .,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Kun Ping Lu
- Division of Translational Therapeutics, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA. .,Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.,Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.,Program in Neuroscience, Harvard Medical School, Boston, MA 02115, USA
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20
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Dong Y, Liang F, Huang L, Fang F, Yang G, Tanzi RE, Zhang Y, Quan Q, Xie Z. The anesthetic sevoflurane induces tau trafficking from neurons to microglia. Commun Biol 2021; 4:560. [PMID: 33980987 PMCID: PMC8115254 DOI: 10.1038/s42003-021-02047-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 03/29/2021] [Indexed: 01/08/2023] Open
Abstract
Accumulation and spread of tau in Alzheimer's disease and other tauopathies occur in a prion-like manner. However, the mechanisms and downstream consequences of tau trafficking remain largely unknown. We hypothesized that tau traffics from neurons to microglia via extracellular vesicles (EVs), leading to IL-6 generation and cognitive impairment. We assessed mice and neurons treated with anesthetics sevoflurane and desflurane, and applied nanobeam-sensor technology, an ultrasensitive method, to measure tau/p-tau amounts. Sevoflurane, but not desflurane, increased tau or p-tau amounts in blood, neuron culture medium, or EVs. Sevoflurane increased p-tau amounts in brain interstitial fluid. Microglia from tau knockout mice took up tau and p-tau when treated with sevoflurane-conditioned neuron culture medium, leading to IL-6 generation. Tau phosphorylation inhibitor lithium and EVs generation inhibitor GW4869 attenuated tau trafficking. GW4869 mitigated sevoflurane-induced cognitive impairment in mice. Thus, tau trafficking could occur from neurons to microglia to generate IL-6, leading to cognitive impairment.
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Affiliation(s)
- Yuanlin Dong
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA
| | - Feng Liang
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA
| | - Lining Huang
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA
- Department of Anesthesiology, the Second Hospital of Hebei Medical University, Shijiazhuang, P.R. China
| | - Fang Fang
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA
- Department of Anesthesia, Zhongshan Hospital, Fudan University, Shanghai, P. R. China
| | - Guang Yang
- Department of Anesthesiology, Columbia University Medical Center, New York, NY, USA
| | - Rudolph E Tanzi
- Genetics and Aging Research Unit, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA
| | - Yiying Zhang
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA
| | - Qimin Quan
- Rowland Institute at Harvard University, Cambridge, MA, USA
- NanoMosaic, Woburn, MA, USA
| | - Zhongcong Xie
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA.
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21
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Balczon R, Morrow KA, Leavesley S, Francis CM, Stevens TC, Agwaramgbo E, Williams C, Stevens RP, Langham G, Voth S, Cioffi EA, Weintraub SE, Stevens T. Cystatin C regulates the cytotoxicity of infection-induced endothelial-derived β-amyloid. FEBS Open Bio 2020; 10:2464-2477. [PMID: 33030263 PMCID: PMC7609779 DOI: 10.1002/2211-5463.12997] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 08/25/2020] [Accepted: 10/05/2020] [Indexed: 02/06/2023] Open
Abstract
Infection of rat pulmonary microvascular endothelial cells with the bacterium Pseudomonas aeruginosa induces the production and release of cytotoxic oligomeric tau and beta amyloid (Aβ). Here, we characterized these cytotoxic amyloids. Cytotoxic behavior and oligomeric tau were partially resistant to digestion with proteinase K, but cytotoxicity was abolished by various denaturants including phenol, diethylpyrocarbonate (DEPC), and 1,1,1,3,3,3-hexafluoro-2-isopropanol (HFIP). Ultracentrifugation for 8 h at 150 000 g was required to remove cytotoxic activity from the supernatant. Ultracentrifugation, DEPC treatment, and immunodepletion using antibodies against Aβ also demonstrated that cytoprotective protein(s) are released from endothelial cells during P. aeruginosa infection. Mass spectrometry of endothelial cell culture media following P. aeruginosa infection allowed identification of multiple potential secreted modulators of Aβ, including cystatin C, gelsolin, and ApoJ/clusterin. Immunodepletion, co-immunoprecipitation, and ultracentrifugation determined that the cytoprotective factor released during infection of endothelial cells by P. aeruginosa is cystatin C, which appears to be in a complex with Aβ. Cytoprotective cystatin C may provide a novel therapeutic avenue for protection against the long-term consequences of infection with P. aeruginosa.
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Affiliation(s)
- Ron Balczon
- Department of Biochemistry and Molecular BiologyUniversity of South AlabamaMobileALUSA
- Center for Lung BiologyUniversity of South AlabamaMobileALUSA
| | - Kyle A. Morrow
- Department of Cell Biology and PhysiologyEdward Via College of Osteopathic MedicineMonroeLAUSA
| | - Silas Leavesley
- Center for Lung BiologyUniversity of South AlabamaMobileALUSA
- Department of Chemical and Biomedical EngineeringUniversity of South AlabamaMobileALUSA
| | - Christopher M. Francis
- Center for Lung BiologyUniversity of South AlabamaMobileALUSA
- Department of Physiology and Cell BiologyUniversity of South AlabamaMobileALUSA
| | - Trevor C. Stevens
- Center for Lung BiologyUniversity of South AlabamaMobileALUSA
- Department of Physiology and Cell BiologyUniversity of South AlabamaMobileALUSA
| | - Ezinne Agwaramgbo
- Department of Physiology and Cell BiologyUniversity of South AlabamaMobileALUSA
| | | | - Reece P. Stevens
- Center for Lung BiologyUniversity of South AlabamaMobileALUSA
- Department of Physiology and Cell BiologyUniversity of South AlabamaMobileALUSA
| | - Geri Langham
- Department of Physiology and Cell BiologyUniversity of South AlabamaMobileALUSA
| | - Sarah Voth
- Center for Lung BiologyUniversity of South AlabamaMobileALUSA
- Department of Physiology and Cell BiologyUniversity of South AlabamaMobileALUSA
| | - Eugene A. Cioffi
- Department of PharmacologyUniversity of South AlabamaMobileALUSA
| | - Susan E. Weintraub
- Department of Biochemistry and Structural Biology and Mass Spectrometry LaboratoryUniversity of Texas at San Antonio Health Sciences CenterTXUSA
| | - Troy Stevens
- Center for Lung BiologyUniversity of South AlabamaMobileALUSA
- Department of Physiology and Cell BiologyUniversity of South AlabamaMobileALUSA
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22
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Renema P, Kozhukhar N, Pastukh V, Spadafora D, Paudel SS, Tambe DT, Alexeyev M, Frank DW, Stevens T. Exoenzyme Y induces extracellular active caspase-7 accumulation independent from apoptosis: modulation of transmissible cytotoxicity. Am J Physiol Lung Cell Mol Physiol 2020; 319:L380-L390. [PMID: 32579398 DOI: 10.1152/ajplung.00508.2019] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Caspase-3 and -7 are executioner caspases whose enzymatic activity is necessary to complete apoptotic cell death. Here, we questioned whether endothelial cell infection leads to caspase-3/7-mediated cell death. Pulmonary microvascular endothelial cells (PMVECs) were infected with Pseudomonas aeruginosa (PA103). PA103 caused cell swelling with a granular appearance, paralleled by intracellular caspase-3/7 activation and cell death. In contrast, PMVEC infection with ExoY+ (PA103 ΔexoUexoT::Tc pUCPexoY) caused cell rounding, but it did not activate intracellular caspase-3/7 and it did not cause cell death. However, ExoY+ led to a time-dependent accumulation of active caspase-7, but not caspase-3, in the supernatant, independent of apoptosis. To study the function of extracellular caspase-7, caspase-7- and caspase-3-deficient PMVECs were generated using clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 technology. Caspase-7 activity was significantly reduced in supernatants from infected caspase-7-deficient cells but was unchanged in supernatants from infected caspase-3 deficient cells, indicating an uncoupling in the mechanism of activation of these two enzymes. Because ExoY+ leads to the release of heat stable amyloid cytotoxins that are responsible for transmissible cytotoxicity, we next questioned whether caspase-7 contributes to the severity of this process. Supernatants obtained from infected caspase-7-deficient cells displayed significantly reduced transmissible cytotoxicity when compared with supernatants from infected wild-type controls, illustrating an essential role for caspase-7 in promoting the potency of transmissible cytotoxicity. Thus, we report a mechanism whereby ExoY+ infection induces active caspase-7 accumulation in the extracellular space, independent of both caspase-3 and cell death, where it modulates ExoY+-induced transmissible cytotoxicity.
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Affiliation(s)
- Phoibe Renema
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama
| | - Natalya Kozhukhar
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama
| | - Viktoriya Pastukh
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama
| | | | - Sunita Subedi Paudel
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama
| | - Dhananjay T Tambe
- Department of Pharmacology, University of South Alabama, Mobile, Alabama.,Department of Mechanical Engineering, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama
| | - Mikhail Alexeyev
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama
| | - Dara W Frank
- Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Troy Stevens
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Department of Internal Medicine, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama
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23
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Lin MT, Balczon R, Pittet JF, Wagener BM, Moser SA, Morrow KA, Voth S, Francis CM, Leavesley S, Bell J, Alvarez DF, Stevens T. Nosocomial Pneumonia Elicits an Endothelial Proteinopathy: Evidence for a Source of Neurotoxic Amyloids in Critically Ill Patients. Am J Respir Crit Care Med 2020; 198:1575-1578. [PMID: 30280916 DOI: 10.1164/rccm.201801-0060le] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Mike T Lin
- University of South Alabama School of MedicineMobile, Alabama
| | - Ron Balczon
- University of South Alabama School of MedicineMobile, Alabama
| | | | - Brant M Wagener
- University of Alabama at Birmingham School of MedicineBirmingham, Alabamaand
| | - Stephen A Moser
- University of Alabama at Birmingham School of MedicineBirmingham, Alabamaand
| | - K Adam Morrow
- Alabama College of Osteopathic MedicineDothan, Alabama
| | - Sarah Voth
- University of South Alabama School of MedicineMobile, Alabama
| | | | - Silas Leavesley
- University of South Alabama School of MedicineMobile, Alabama
| | - Jessica Bell
- University of South Alabama School of MedicineMobile, Alabama
| | - Diego F Alvarez
- University of South Alabama School of MedicineMobile, Alabama
| | - Troy Stevens
- University of South Alabama School of MedicineMobile, Alabama
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24
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Pneumonia-induced endothelial amyloids reduce dendritic spine density in brain neurons. Sci Rep 2020; 10:9327. [PMID: 32518286 PMCID: PMC7283224 DOI: 10.1038/s41598-020-66321-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 05/14/2020] [Indexed: 12/26/2022] Open
Abstract
Pseudomonas aeruginosa pneumonia elicits endothelial cell release of cytotoxic amyloids that can be recovered from the bronchoalveolar lavage and cerebrospinal fluids of critically ill patients. Introduction of these cytotoxic amyloids into the lateral ventricle impairs learning and memory in mice. However, it is unclear whether the amyloids of lung origin (1) are neurotropic, and (2) cause structural remodeling of hippocampal dendrites. Thus, we used electrophysiological studies in brain slices and structural analysis of post-mortem tissues obtained from animals exposed to endothelium-derived amyloids to assess these issues. The amyloids were administered via three different routes, by intracerebroventricular, intratracheal, and intraperitoneal injections. Synaptic long-term potentiation was abolished following intracerebroventricular amyloid injection. Fluorescence dialysis or Golgi-impregnation labeling showed reduced dendritic spine density and destabilized spines of hippocampal pyramidal neurons 4 weeks after intracerebroventricular amyloid injection. In comparison, endothelial amyloids introduced to the airway caused the most prominent dendritic spine density reduction, yet intraperitoneal injection of these amyloids did not affect spine density. Our findings indicate that infection-elicited lung endothelial amyloids are neurotropic and reduce neuronal dendritic spine density in vivo. Amyloids applied into the trachea may either be disseminated through the circulation and cross the blood-brain barrier to access the brain, initiate feed-forward amyloid transmissibility among cells of the blood-brain barrier or access the brain in other ways. Nevertheless, lung-derived amyloids suppress hippocampal signaling and cause injury to neuronal structure.
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Exoenzyme Y Contributes to End-Organ Dysfunction Caused by Pseudomonas aeruginosa Pneumonia in Critically Ill Patients: An Exploratory Study. Toxins (Basel) 2020; 12:toxins12060369. [PMID: 32512716 PMCID: PMC7354586 DOI: 10.3390/toxins12060369] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 05/31/2020] [Accepted: 06/01/2020] [Indexed: 12/19/2022] Open
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen that causes pneumonia in immunocompromised and intensive care unit (ICU) patients. During host infection, P. aeruginosa upregulates the type III secretion system (T3SS), which is used to intoxicate host cells with exoenzyme (Exo) virulence factors. Of the four known Exo virulence factors (U, S, T and Y), ExoU has been shown in prior studies to associate with high mortality rates. Preclinical studies have shown that ExoY is an important edema factor in lung infection caused by P. aeruginosa, although its importance in clinical isolates of P. aeruginosa is unknown. We hypothesized that expression of ExoY would be highly prevalent in clinical isolates and would significantly contribute to patient morbidity secondary to P. aeruginosa pneumonia. A single-center, prospective observational study was conducted at the University of Alabama at Birmingham Hospital. Mechanically ventilated ICU patients with a bronchoalveolar lavage fluid culture positive for P. aeruginosa were included. Enrolled patients were followed from ICU admission to discharge and clinical P. aeruginosa isolates were genotyped for the presence of exoenzyme genes. Ninety-nine patients were enrolled in the study. ExoY was present in 93% of P. aeruginosa clinical isolates. Moreover, ExoY alone (ExoY+/ExoU−) was present in 75% of P. aeruginosa isolates, compared to 2% ExoU alone (ExoY−/ExoU+). We found that bacteria isolated from human samples expressed active ExoY and ExoU, and the presence of ExoY in clinical isolates was associated with end-organ dysfunction. This is the first study we are aware of that demonstrates that ExoY is important in clinical outcomes secondary to nosocomial pneumonia.
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Voth S, Gwin M, Francis CM, Balczon R, Frank DW, Pittet JF, Wagener BM, Moser SA, Alexeyev M, Housley N, Audia JP, Piechocki S, Madera K, Simmons A, Crawford M, Stevens T. Virulent Pseudomonas aeruginosa infection converts antimicrobial amyloids into cytotoxic prions. FASEB J 2020; 34:9156-9179. [PMID: 32413239 PMCID: PMC7383673 DOI: 10.1096/fj.202000051rrr] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 04/19/2020] [Accepted: 04/21/2020] [Indexed: 01/05/2023]
Abstract
Pseudomonas aeruginosa infection elicits the production of cytotoxic amyloids from lung endothelium, yet molecular mechanisms of host‐pathogen interaction that underlie the amyloid production are not well understood. We examined the importance of type III secretion system (T3SS) effectors in the production of cytotoxic amyloids. P aeruginosa possessing a functional T3SS and effectors induced the production and release of cytotoxic amyloids from lung endothelium, including beta amyloid, and tau. T3SS effector intoxication was sufficient to generate cytotoxic amyloid release, yet intoxication with exoenzyme Y (ExoY) alone or together with exoenzymes S and T (ExoS/T/Y) generated the most virulent amyloids. Infection with lab and clinical strains engendered cytotoxic amyloids that were capable of being propagated in endothelial cell culture and passed to naïve cells, indicative of a prion strain. Conversely, T3SS‐incompetent P aeruginosa infection produced non‐cytotoxic amyloids with antimicrobial properties. These findings provide evidence that (1) endothelial intoxication with ExoY is sufficient to elicit self‐propagating amyloid cytotoxins during infection, (2) pulmonary endothelium contributes to innate immunity by generating antimicrobial amyloids in response to bacterial infection, and (3) ExoY contributes to the virulence arsenal of P aeruginosa through the subversion of endothelial amyloid host‐defense to promote a lung endothelial‐derived cytotoxic proteinopathy.
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Affiliation(s)
- Sarah Voth
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, USA.,Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Meredith Gwin
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, USA.,Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Christopher Michael Francis
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, USA.,Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Ron Balczon
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, AL, USA.,Department of Biochemistry and Molecular Biology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Dara W Frank
- Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Jean-Francois Pittet
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham School of Medicine, Birmingham, AL, USA
| | - Brant M Wagener
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham School of Medicine, Birmingham, AL, USA
| | - Stephen A Moser
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, AL, USA
| | - Mikhail Alexeyev
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, USA.,Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Nicole Housley
- Department of Microbiology and Immunology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Jonathon P Audia
- Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, AL, USA.,Department of Microbiology and Immunology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Scott Piechocki
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Kayla Madera
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Autumn Simmons
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Michaela Crawford
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, USA
| | - Troy Stevens
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, AL, USA.,Center for Lung Biology, College of Medicine, University of South Alabama, Mobile, AL, USA.,Department of Internal Medicine, College of Medicine, University of South Alabama, Mobile, AL, USA
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27
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Balczon R, Pittet JF, Wagener BM, Moser SA, Voth S, Vorhees CV, Williams MT, Bridges JP, Alvarez DF, Koloteva A, Xu Y, Zha XM, Audia JP, Stevens T, Lin MT. Infection-induced endothelial amyloids impair memory. FASEB J 2019; 33:10300-10314. [PMID: 31211919 PMCID: PMC6704457 DOI: 10.1096/fj.201900322r] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 05/21/2019] [Indexed: 01/14/2023]
Abstract
Patients with nosocomial pneumonia exhibit elevated levels of neurotoxic amyloid and tau proteins in the cerebrospinal fluid (CSF). In vitro studies indicate that pulmonary endothelium infected with clinical isolates of either Pseudomonas aeruginosa, Klebsiella pneumoniae, or Staphylococcus aureus produces and releases cytotoxic amyloid and tau proteins. However, the effects of the pulmonary endothelium-derived amyloid and tau proteins on brain function have not been elucidated. Here, we show that P. aeruginosa infection elicits accumulation of detergent insoluble tau protein in the mouse brain and inhibits synaptic plasticity. Mice receiving endothelium-derived amyloid and tau proteins via intracerebroventricular injection exhibit a learning and memory deficit in object recognition, fear conditioning, and Morris water maze studies. We compared endothelial supernatants obtained after the endothelia were infected with P. aeruginosa possessing an intact [P. aeruginosa isolated from patient 103 (PA103) supernatant] or defective [mutant strain of P. aeruginosa lacking a functional type 3 secretion system needle tip complex (ΔPcrV) supernatant] type 3 secretion system. Whereas the PA103 supernatant impaired working memory, the ΔPcrV supernatant had no effect. Immunodepleting amyloid or tau proteins from the PA103 supernatant with the A11 or T22 antibodies, respectively, overtly rescued working memory. Recordings from hippocampal slices treated with endothelial supernatants or CSF from patients with or without nosocomial pneumonia indicated that endothelium-derived neurotoxins disrupted the postsynaptic synaptic response. Taken together, these results establish a plausible mechanism for the neurologic sequelae consequent to nosocomial bacterial pneumonia.-Balczon, R., Pittet, J.-F., Wagener, B. M., Moser, S. A., Voth, S., Vorhees, C. V., Williams, M. T., Bridges, J. P., Alvarez, D. F., Koloteva, A., Xu, Y., Zha, X.-M., Audia, J. P., Stevens, T., Lin, M. T. Infection-induced endothelial amyloids impair memory.
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Affiliation(s)
- Ron Balczon
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, Alabama, USA
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, USA
| | - Jean-Francois Pittet
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA
| | - Brant M. Wagener
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA
| | - Stephen A. Moser
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, USA
| | - Sarah Voth
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, USA
| | - Charles V. Vorhees
- Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio, USA
- Department of Environmental Health, University of Cincinnati, Cincinnati, Ohio, USA
| | | | - James P. Bridges
- Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio, USA
| | - Diego F. Alvarez
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, USA
| | - Anna Koloteva
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, USA
| | - Yuanyuan Xu
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, USA
| | - Xiang-Ming Zha
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, USA
| | - Jonathon P. Audia
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, USA
- Department of Microbiology and Immunology, University of South Alabama, Mobile, Alabama, USA
| | - Troy Stevens
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, USA
- Department of Internal Medicine, University of South Alabama, Mobile, Alabama, USA
| | - Mike T. Lin
- Center for Lung Biology, University of South Alabama, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama, USA
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28
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Casal D, Iria I, Ramalho JS, Alves S, Mota-Silva E, Mascarenhas-Lemos L, Pontinha C, Guadalupe-Cabral M, Ferreira-Silva J, Ferraz-Oliveira M, Vassilenko V, Goyri-O'Neill J, Pais D, Videira PA. BD-2 and BD-3 increase skin flap survival in a model of ischemia and Pseudomonas aeruginosa infection. Sci Rep 2019; 9:7854. [PMID: 31133641 PMCID: PMC6536547 DOI: 10.1038/s41598-019-44153-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Accepted: 05/09/2019] [Indexed: 02/08/2023] Open
Abstract
The main aim of this work was to study the usefulness of human β-defensins 2 (BD-2) and 3 (BD-3), which are part of the innate immune system, in the treatment of infected ischemic skin flaps. We investigated the effect of transducing rat ischemic skin flaps with lentiviral vectors encoding human BD-2, BD-3, or both BD-2 and BD-3, to increase flap survival in the context of a P. aeruginosa infection associated with a foreign body. The secondary endpoints assessed were: bacterial counts, and biofilm formation on the surface of the foreign body. A local ischemic environment was created by producing arterialized venous flaps in the left epigastric region of rats. Flaps were intentionally infected by placing underneath them two catheters with 105 CFU of P. aeruginosa before the surgical wounds were hermetically closed. Flap biopsies were performed 3 and 7 days post-operatively, and the specimens submitted to immunohistochemical analysis for BD-2 and BD-3, as well as to bacterial quantification. Subsequently, the catheter segments were analyzed with scanning electron microscopy (SEM). Flaps transduced with BD-2 and BD-3 showed expression of these defensins and presented increased flap survival. Rats transduced with BD-3 presented a net reduction in the number of P. aeruginosa on the surface of the foreign body and lesser biofilm formation.
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Affiliation(s)
- Diogo Casal
- Anatomy Department, NOVA Medical School, Universidade NOVA de Lisboa, Lisbon, Portugal.
- Plastic and Reconstructive Surgery Department and Burn Unit, Centro Hospitalar de Lisboa Central - Hospital de São José, Lisbon, Portugal.
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Lisbon, Caparica, Portugal.
- CEDOC, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Lisbon, Portugal.
| | - Inês Iria
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Lisbon, Caparica, Portugal
- CEDOC, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Lisbon, Portugal
- Molecular Microbiology and Biotechnology Unit, iMed, ULisboa, Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
- INESC MN - Microsystems and Nanotechnologies, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - José S Ramalho
- CEDOC, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Lisbon, Portugal
| | - Sara Alves
- Pathology Department, Centro Hospitalar de Lisboa Central - Hospital de São José, Lisbon, Portugal
| | - Eduarda Mota-Silva
- LIBPhys, Physics Department, Faculdade de Ciências e Tecnologias, Universidade NOVA de Lisboa, Lisbon, Caparica, Portugal
| | - Luís Mascarenhas-Lemos
- Anatomy Department, NOVA Medical School, Universidade NOVA de Lisboa, Lisbon, Portugal
- Pathology Department, Centro Hospitalar de Lisboa Central - Hospital de São José, Lisbon, Portugal
| | - Carlos Pontinha
- Anatomy Department, NOVA Medical School, Universidade NOVA de Lisboa, Lisbon, Portugal
- Pathology Department, Centro Hospitalar de Lisboa Central - Hospital de São José, Lisbon, Portugal
| | - Maria Guadalupe-Cabral
- CEDOC, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Lisbon, Portugal
| | - José Ferreira-Silva
- Pathology Department, Centro Hospitalar de Lisboa Central - Hospital de São José, Lisbon, Portugal
| | - Mário Ferraz-Oliveira
- Pathology Department, Centro Hospitalar de Lisboa Central - Hospital de São José, Lisbon, Portugal
| | - Valentina Vassilenko
- LIBPhys, Physics Department, Faculdade de Ciências e Tecnologias, Universidade NOVA de Lisboa, Lisbon, Caparica, Portugal
| | - João Goyri-O'Neill
- Anatomy Department, NOVA Medical School, Universidade NOVA de Lisboa, Lisbon, Portugal
| | - Diogo Pais
- Anatomy Department, NOVA Medical School, Universidade NOVA de Lisboa, Lisbon, Portugal
| | - Paula A Videira
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Lisbon, Caparica, Portugal.
- CEDOC, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Lisbon, Portugal.
- CDG & Allies- Professional and Patient Association International Network (PPAIN), Lisbon, Caparica, Portugal.
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29
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Lee JY, Onanyan M, Garrison I, White R, Crook M, Alexeyev MF, Kozhukhar N, Pastukh V, Swenson ER, Supuran CT, Stevens T. Extrinsic acidosis suppresses glycolysis and migration while increasing network formation in pulmonary microvascular endothelial cells. Am J Physiol Lung Cell Mol Physiol 2019; 317:L188-L201. [PMID: 31042076 DOI: 10.1152/ajplung.00544.2018] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Acidosis is common among critically ill patients, but current approaches to correct pH do not improve disease outcomes. During systemic acidosis, cells are either passively exposed to extracellular acidosis that other cells have generated (extrinsic acidosis) or they are exposed to acid that they generate and export into the extracellular space (intrinsic acidosis). Although endothelial repair following intrinsic acidosis has been studied, the impact of extrinsic acidosis on migration and angiogenesis is unclear. We hypothesized that extrinsic acidosis inhibits metabolism and migration but promotes capillary-like network formation in pulmonary microvascular endothelial cells (PMVECs). Extrinsic acidosis was modeled by titrating media pH. Two types of intrinsic acidosis were compared, including increasing cellular metabolism by chemically inhibiting carbonic anhydrases (CAs) IX and XII (SLC-0111) and with hypoxia. PMVECs maintained baseline intracellular pH for 24 h with both extrinsic and intrinsic acidosis. Whole cell CA IX protein expression was decreased by extrinsic acidosis but not affected by hypoxia. When extracellular pH was equally acidic, extrinsic acidosis suppressed glycolysis, whereas intrinsic acidosis did not. Extrinsic acidosis suppressed migration, but increased Matrigel network master junction and total segment length. CRISPR-Cas9 CA IX knockout PMVECs revealed an independent role of CA IX in promoting glycolysis, as loss of CA IX alone was accompanied by decreased hexokinase I and pyruvate dehydrogenase E1α expression and decreasing migration. 2-deoxy-d-glucose had no effect on migration but profoundly inhibited network formation and increased N-cadherin expression. Thus, we report that while extrinsic acidosis suppresses endothelial glycolysis and migration, it promotes network formation.
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Affiliation(s)
- Ji Young Lee
- Departments of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Department of Internal Medicine, University of South Alabama, Mobile, Alabama.,Division of Pulmonary and Critical Care Medicine, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama.,College of Medicine, University of South Alabama, Mobile, Alabama
| | - Mher Onanyan
- Department of Internal Medicine, University of South Alabama, Mobile, Alabama.,Division of Pulmonary and Critical Care Medicine, University of South Alabama, Mobile, Alabama.,College of Medicine, University of South Alabama, Mobile, Alabama
| | - Ian Garrison
- College of Medicine, University of South Alabama, Mobile, Alabama
| | - Roderica White
- College of Medicine, University of South Alabama, Mobile, Alabama.,Center for Healthy Communities, University of South Alabama, Mobile, Alabama
| | - Maura Crook
- College of Medicine, University of South Alabama, Mobile, Alabama.,Office of Diversity and Inclusion, University of South Alabama, Mobile, Alabama
| | - Mikhail F Alexeyev
- Departments of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama.,College of Medicine, University of South Alabama, Mobile, Alabama
| | - Natalya Kozhukhar
- Departments of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama.,College of Medicine, University of South Alabama, Mobile, Alabama
| | - Viktoriya Pastukh
- Departments of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama.,College of Medicine, University of South Alabama, Mobile, Alabama
| | - Erik R Swenson
- Medical Service, VA Puget Sound Health Care System, University of Washington, Seattle, Washington
| | | | - Troy Stevens
- Departments of Physiology and Cell Biology, University of South Alabama, Mobile, Alabama.,Department of Internal Medicine, University of South Alabama, Mobile, Alabama.,Center for Lung Biology, University of South Alabama, Mobile, Alabama.,College of Medicine, University of South Alabama, Mobile, Alabama
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30
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Balczon R, Francis M, Leavesley S, Stevens T. Methods for Detecting Cytotoxic Amyloids Following Infection of Pulmonary Endothelial Cells by Pseudomonas aeruginosa. J Vis Exp 2018. [PMID: 30059033 DOI: 10.3791/57447] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Patients who survive pneumonia have elevated death rates in the months following hospital discharge. It has been hypothesized that infection of pulmonary tissue during pneumonia results in the production of long-lived cytotoxins that can lead to subsequent end organ failure. We have developed in vitro assays to test the hypothesis that cytotoxins are produced during pulmonary infection. Isolated rat pulmonary endothelial cells and the bacterium Pseudomonas aeruginosa are used as model systems, and the production of cytoxins following infection of the endothelial cells by the bacteria is demonstrated using cell culture followed by direct quantitation using lactate dehydrogenase assays and a novel microscopic method utilizing ImageJ technology. The amyloid nature of these cytotoxins was demonstrated by thioflavin T binding assays and by immunoblotting and immunodepletion using A11 anti-amyloid antibody. Further analyses using immunoblotting demonstrated that oligomeric tau and Aβ were produced and released by endothelial cells following infection by P. aeruginosa. These methods should be readily adaptable to analyses of human clinical samples.
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Affiliation(s)
- Ron Balczon
- Department of Biochemistry and Molecular Biology, University of South Alabama; Center for Lung Biology, University of South Alabama;
| | - Michael Francis
- Department of Physiology and Cell Biology, University of South Alabama; Center for Lung Biology, University of South Alabama
| | - Silas Leavesley
- Department of Chemical and Biomolecular Engineering, University of South Alabama; Center for Lung Biology, University of South Alabama
| | - Troy Stevens
- Department of Physiology and Cell Biology, University of South Alabama; Center for Lung Biology, University of South Alabama
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31
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Lee JY, Alexeyev M, Kozhukhar N, Pastukh V, White R, Stevens T. Carbonic anhydrase IX is a critical determinant of pulmonary microvascular endothelial cell pH regulation and angiogenesis during acidosis. Am J Physiol Lung Cell Mol Physiol 2018; 315:L41-L51. [PMID: 29631360 DOI: 10.1152/ajplung.00446.2017] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Carbonic anhydrase IX (CA IX) is highly expressed in rapidly proliferating and highly glycolytic cells, where it serves to enhance acid-regulatory capacity. Pulmonary microvascular endothelial cells (PMVECs) actively utilize aerobic glycolysis and acidify media, whereas pulmonary arterial endothelial cells (PAECs) primarily rely on oxidative phosphorylation and minimally change media pH. Therefore, we hypothesized that CA IX is critical to PMVEC angiogenesis because of its important role in regulating pH. To test this hypothesis, PMVECs and PAECs were isolated from Sprague-Dawley rats. CA IX knockout PMVECs were generated using the CRISPR-Cas9 technique. During serum-stimulated growth, mild acidosis (pH 6.8) did not affect cell counts of PMVECs, but it decreased PAEC cell number. Severe acidosis (pH 6.2) decreased cell counts of PMVECs and elicited an even more pronounced reduction of PAECs. PMVECs had a higher CA IX expression compared with PAECs. CA activity was higher in PMVECs compared with PAECs, and enzyme activity was dependent on the type IX isoform. Pharmacological inhibition and genetic ablation of CA IX caused profound dysregulation of extra- and intracellular pH in PMVECs. Matrigel assays revealed impaired angiogenesis of CA IX knockout PMVECs in acidosis. Lastly, pharmacological CA IX inhibition caused profound cell death in PMVECs, whereas genetic CA IX ablation had little effect on PMVEC cell death in acidosis. Thus CA IX controls PMVEC pH necessary for angiogenesis during acidosis. CA IX may contribute to lung vascular repair during acute lung injury that is accompanied by acidosis within the microenvironment.
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Affiliation(s)
- Ji Young Lee
- Department of Physiology and Cell Biology, University of South Alabama , Mobile, Alabama.,Department of Internal Medicine, University of South Alabama , Mobile, Alabama.,Division of Pulmonary and Critical Care Medicine, University of South Alabama , Mobile, Alabama.,Center for Lung Biology, University of South Alabama , Mobile, Alabama
| | - Mikhail Alexeyev
- Department of Physiology and Cell Biology, University of South Alabama , Mobile, Alabama.,Center for Lung Biology, University of South Alabama , Mobile, Alabama
| | - Natalya Kozhukhar
- Department of Physiology and Cell Biology, University of South Alabama , Mobile, Alabama.,Center for Lung Biology, University of South Alabama , Mobile, Alabama
| | - Viktoriya Pastukh
- Department of Physiology and Cell Biology, University of South Alabama , Mobile, Alabama.,Center for Lung Biology, University of South Alabama , Mobile, Alabama
| | - Roderica White
- Center for Healthy Communities, University of South Alabama , Mobile, Alabama
| | - Troy Stevens
- Department of Physiology and Cell Biology, University of South Alabama , Mobile, Alabama.,Department of Internal Medicine, University of South Alabama , Mobile, Alabama.,Center for Lung Biology, University of South Alabama , Mobile, Alabama
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