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Williams-Brown MY, Summey RM, Newtson A, Burke W, Turner T, Sabu P, Davidson BA, Glaser G. System-level recommendations for improved wellness for gynecologic oncologists: A Society of Gynecologic Oncology Review. Gynecol Oncol 2024; 183:85-92. [PMID: 38554478 DOI: 10.1016/j.ygyno.2024.03.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 03/15/2024] [Accepted: 03/19/2024] [Indexed: 04/01/2024]
Abstract
Burnout and its negative sequelae are a persistent problem in gynecologic oncology, threatening the health of our physician workforce. Individual-level interventions such as stress management training, physical activity, and sleep hygiene only partially address this widespread, systemic crisis rooted in the extended work hours and stressful situations associated with gynecologic oncology practice. There is an urgent need for systematic, institution-level changes to allow gynecologic oncologists to continue the crucial work of caring for people with gynecologic cancer. We present recommendations for institution-level changes which are grounded in the framework presented by the National Plan for Health Workforce Well-Being by the National Academy of Medicine. These are aimed at facilitating gynecologic oncologists' well-being and reduction of burnout. Recommendations include efforts to create a more positive and inclusive work environment, decrease administrative barriers, promote mental health, optimize electronic medical record use, and support a diverse workforce. Implementation and regular evaluation of these interventions, with specific attention to at-risk groups, is an important next step.
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Affiliation(s)
- M Y Williams-Brown
- Department of Women's Health, Dell Medical School at The University of Texas at Austin, Austin, TX, United States of America.
| | - R M Summey
- Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, WI, United States of America
| | - A Newtson
- Department of Obstetrics and Gynecology, University of Nebraska Medical Center, Omaha, NE, United States of America
| | - W Burke
- Department of Obstetrics, Gynecology and Reproductive Medicine, Stony Brook University Cancer Center, Stony Brook, NY, United States of America
| | - T Turner
- St. Luke's Cancer Institute, Boise, ID, United States of America
| | - P Sabu
- Division of Gynecologic Oncology, University of Kansas Medical Center, Kansas City, KS, United States of America
| | - B A Davidson
- Division of Gynecologic Oncology, Duke University, Durham, NC, United States of America
| | - G Glaser
- Division of Gynecologic Oncology, Mayo Clinic College of Medicine, Rochester, MN, United States of America
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Sia ZR, Roy J, Huang WC, Song Y, Zhou S, Luo Y, Li Q, Arpin D, Kutscher HL, Ortega J, Davidson BA, Lovell JF. Adjuvanted nanoliposomes displaying six hemagglutinins and neuraminidases as an influenza virus vaccine. Cell Rep Med 2024; 5:101433. [PMID: 38401547 PMCID: PMC10982964 DOI: 10.1016/j.xcrm.2024.101433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 11/29/2023] [Accepted: 01/25/2024] [Indexed: 02/26/2024]
Abstract
Inclusion of defined quantities of the two major surface proteins of influenza virus, hemagglutinin (HA) and neuraminidase (NA), could benefit seasonal influenza vaccines. Recombinant HA and NA multimeric proteins derived from three influenza serotypes, H1N1, H3N2, and type B, are surface displayed on nanoliposomes co-loaded with immunostimulatory adjuvants, generating "hexaplex" particles that are used to immunize mice. Protective immune responses to hexaplex liposomes involve functional antibody elicitation against each included antigen, comparable to vaccination with monovalent antigen particles. When compared to contemporary recombinant or adjuvanted influenza virus vaccines, hexaplex liposomes perform favorably in many areas, including antibody production, T cell activation, protection from lethal virus challenge, and protection following passive sera transfer. Based on these results, hexaplex liposomes warrant further investigation as an adjuvanted recombinant influenza vaccine formulation.
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Affiliation(s)
- Zachary R Sia
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Jayishnu Roy
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Wei-Chiao Huang
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA; POP Biotechnologies, Buffalo, NY 14228, USA
| | - Yiting Song
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Shiqi Zhou
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Yuan Luo
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Qinzhe Li
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Dominic Arpin
- Department of Anatomy and Cell Biology, McGill University, Montreal, QC H3A 0C7, Canada
| | - Hilliard L Kutscher
- POP Biotechnologies, Buffalo, NY 14228, USA; Department of Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY 14203, USA
| | - Joaquin Ortega
- Department of Anatomy and Cell Biology, McGill University, Montreal, QC H3A 0C7, Canada
| | - Bruce A Davidson
- Department of Anesthesiology, University at Buffalo, State University of New York, Buffalo, NY 14203, USA.
| | - Jonathan F Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA.
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Davidson BA, Turner TB, Kim KH, Cass I, Calat L, McGwin G, Kushner DM. SGO and the elephant that is still in the room: Wellness, burnout and gynecologic oncology. Gynecol Oncol 2022; 167:354-359. [PMID: 36064677 DOI: 10.1016/j.ygyno.2022.08.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To measure wellness and burnout among gynecologic oncology clinicians and identify trends and at-risk populations to inform future interventions. METHODS Gynecologic oncologist (GO) and advanced practice provider (APP) responses to the 2020 Society of Gynecologic Oncology State of the Society survey were analyzed. The Maslach Burnout Inventory criteria for burnout was used. Work-life balance was scored on a 5-point Likert scale. Chi-square tests were used to compare mental health factors and the prevalence of burnout. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated for associations between burnout and gender. RESULTS 543 survey responses were included for analysis. Most GO (54%) and all APP respondents were female. Female GOs were disproportionately affected by burnout particularly in the Northeast (female(F): 40.9% vs male(M): 19.1%, p = 0.007) and South (F: 42.5% vs M:22.9%, p = 0.01). Burnout in female GOs over 40 was 1.79 (CI: 1.13-2.83; p-value 0.01) times higher than similarly aged males. Females in non-private practice experienced burnout 1.66 times that of males in similar positions (CI: 1.18-2.94; p < 0.0001). Female GOs reported the worst work-life balance across all 5 domains. APPs and female GOs experienced more stress and feeling overwhelmed compared to men. GOs were more reluctant to see a mental health professional (p = 0.0003) or take medication (p = 0.009) than APPs. CONCLUSIONS Burnout in gynecologic oncology persists in both genders and is felt most acutely by female GOs. APPs are not immune and would benefit from inclusion in future research to mitigate burnout in healthcare clinicians.
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Affiliation(s)
- B A Davidson
- Division of Gynecologic Oncology, Duke University, Durham, NC, United States of America.
| | - T B Turner
- St. Luke's Cancer Institute, Boise, ID, United States of America
| | - K H Kim
- Division of Gynecologic Oncology, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America
| | - I Cass
- Division of Gynecologic Oncology, Dartmouth-Hitchcock Medical Center, Lebanon, NH, United States of America
| | - L Calat
- Department of Obstetrics and Gynecology, NYU Langone Health, New York, NY, United States of America
| | - G McGwin
- School of Public Health, Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL, United States of America
| | - D M Kushner
- Division of Gynecologic Oncology, University of Wisconsin, Madison, WI, United States of America
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Bohannon CD, Ende Z, Cao W, Mboko WP, Ranjan P, Kumar A, Mishina M, Amoah S, Gangappa S, Mittal SK, Lovell JF, García‐Sastre A, Pfeifer BA, Davidson BA, Knight P, Sambhara S. Influenza Virus Infects and Depletes Activated Adaptive Immune Responders. Adv Sci (Weinh) 2021; 8:e2100693. [PMID: 34189857 PMCID: PMC8373117 DOI: 10.1002/advs.202100693] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 05/18/2021] [Indexed: 05/14/2023]
Abstract
Influenza infections cause several million cases of severe respiratory illness, hospitalizations, and hundreds of thousands of deaths globally. Secondary infections are a leading cause of influenza's high morbidity and mortality, and significantly factored into the severity of the 1918, 1968, and 2009 pandemics. Furthermore, there is an increased incidence of other respiratory infections even in vaccinated individuals during influenza season. Putative mechanisms responsible for vaccine failures against influenza as well as other respiratory infections during influenza season are investigated. Peripheral blood mononuclear cells (PBMCs) are used from influenza vaccinated individuals to assess antigen-specific responses to influenza, measles, and varicella. The observations made in humans to a mouse model to unravel the mechanism is confirmed and extended. Infection with influenza virus suppresses an ongoing adaptive response to vaccination against influenza as well as other respiratory pathogens, i.e., Adenovirus and Streptococcus pneumoniae by preferentially infecting and killing activated lymphocytes which express elevated levels of sialic acid receptors. These findings propose a new mechanism for the high incidence of secondary respiratory infections due to bacteria and other viruses as well as vaccine failures to influenza and other respiratory pathogens even in immune individuals due to influenza viral infections.
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Affiliation(s)
- Caitlin D. Bohannon
- Influenza DivisionCenters for Disease Control and PreventionAtlantaGA30329USA
- Oak Ridge Institute for Science and Education (ORISE)CDC Fellowship ProgramOak RidgeTN37831USA
| | - Zachary Ende
- Influenza DivisionCenters for Disease Control and PreventionAtlantaGA30329USA
- Oak Ridge Institute for Science and Education (ORISE)CDC Fellowship ProgramOak RidgeTN37831USA
| | - Weiping Cao
- Influenza DivisionCenters for Disease Control and PreventionAtlantaGA30329USA
| | - Wadzanai P. Mboko
- Influenza DivisionCenters for Disease Control and PreventionAtlantaGA30329USA
- Department of Comparative Pathobiology and Purdue Institute for InflammationImmunologyand Infectious DiseasePurdue UniversityWest LafayetteIN47907USA
| | - Priya Ranjan
- Influenza DivisionCenters for Disease Control and PreventionAtlantaGA30329USA
| | - Amrita Kumar
- Influenza DivisionCenters for Disease Control and PreventionAtlantaGA30329USA
| | - Margarita Mishina
- Influenza DivisionCenters for Disease Control and PreventionAtlantaGA30329USA
| | - Samuel Amoah
- Influenza DivisionCenters for Disease Control and PreventionAtlantaGA30329USA
| | | | - Suresh K. Mittal
- Department of Comparative Pathobiology and Purdue Institute for InflammationImmunologyand Infectious DiseasePurdue UniversityWest LafayetteIN47907USA
| | - Jonathan F. Lovell
- Department of Biomedical EngineeringState University of New York at BuffaloBuffaloNY14260USA
| | - Adolfo García‐Sastre
- Global Health and Emerging Pathogens InstituteIcahn School of Medicine at Mount SinaiNew YorkNY10029USA
- Department of MicrobiologyIcahn School of Medicine at Mount SinaiNew YorkNY10029USA
- Department of MedicineDivision of Infectious DiseasesIcahn School of Medicine at Mount SinaiNew YorkNY10029USA
- The Tisch Cancer InstituteIcahn School of Medicine at Mount SinaiNew YorkNY10029USA
| | - Blaine A. Pfeifer
- Department of Chemical and Biological EngineeringSchool of Engineering and Applied SciencesState University of New York at BuffaloBuffaloNY14260USA
| | - Bruce A. Davidson
- Department of AnesthesiologyJacobs School of Medicine and Biomedical SciencesState University of New York at BuffaloBuffaloNY14260USA
- Department of Pathology and Anatomical SciencesSchool of Medicine and Biomedical SciencesState University of New York at BuffaloBuffaloNY14260USA
- Research ServiceVeterans AdministrationWestern New York Healthcare SystemBuffaloNY14215USA
| | - Paul Knight
- Department of AnesthesiologyJacobs School of Medicine and Biomedical SciencesState University of New York at BuffaloBuffaloNY14260USA
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Alqassim EY, Sharma S, Khan ANMNH, Emmons TR, Cortes Gomez E, Alahmari A, Singel KL, Mark J, Davidson BA, Robert McGray AJ, Liu Q, Lichty BD, Moysich KB, Wang J, Odunsi K, Segal BH, Baysal BE. RNA editing enzyme APOBEC3A promotes pro-inflammatory M1 macrophage polarization. Commun Biol 2021; 4:102. [PMID: 33483601 PMCID: PMC7822933 DOI: 10.1038/s42003-020-01620-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 12/15/2020] [Indexed: 02/07/2023] Open
Abstract
Pro-inflammatory M1 macrophage polarization is associated with microbicidal and antitumor responses. We recently described APOBEC3A-mediated cytosine-to-uracil (C > U) RNA editing during M1 polarization. However, the functional significance of this editing is unknown. Here we find that APOBEC3A-mediated cellular RNA editing can also be induced by influenza or Maraba virus infections in normal human macrophages, and by interferons in tumor-associated macrophages. Gene knockdown and RNA_Seq analyses show that APOBEC3A mediates C>U RNA editing of 209 exonic/UTR sites in 203 genes during M1 polarization. The highest level of nonsynonymous RNA editing alters a highly-conserved amino acid in THOC5, which encodes a nuclear mRNA export protein implicated in M-CSF-driven macrophage differentiation. Knockdown of APOBEC3A reduces IL6, IL23A and IL12B gene expression, CD86 surface protein expression, and TNF-α, IL-1β and IL-6 cytokine secretion, and increases glycolysis. These results show a key role of APOBEC3A cytidine deaminase in transcriptomic and functional polarization of M1 macrophages.
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Affiliation(s)
- Emad Y Alqassim
- Department of Cancer Prevention and Control, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
- Department of Pathology, Faculty of Medicine, Jazan University, Jazan, 45142, Saudi Arabia
| | - Shraddha Sharma
- Department of Pathology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
- Translate Bio, Lexington, MA, 02421, USA
| | - A N M Nazmul H Khan
- Department of Internal Medicine,, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
| | - Tiffany R Emmons
- Department of Immunology,, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
| | - Eduardo Cortes Gomez
- Department of Biostatistics/Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
| | - Abdulrahman Alahmari
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
- Department of Medical Laboratory Sciences, Prince Sattam Bin Abdulaziz University, Al-Kharj, 16278, Saudi Arabia
| | - Kelly L Singel
- Department of Immunology,, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
- Office of Evaluation, Performance, and Reporting, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Jaron Mark
- Department of Gynecologic Oncology,, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
- The Start Center for Cancer Care, 4383 Medical Drive, San Antonio, TX, 78229, USA
| | - Bruce A Davidson
- Departments of Anesthesiology, Pathology and Anatomical Sciences, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, 14203, USA
| | - A J Robert McGray
- Center for Immunotherapy, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
| | - Qian Liu
- Department of Biostatistics/Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
| | - Brian D Lichty
- McMaster Immunology Research Centre, McMaster University, 1200 Main St W, Hamilton, ON, L8N 3Z5, Canada
| | - Kirsten B Moysich
- Department of Cancer Prevention and Control, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
| | - Jianmin Wang
- Department of Biostatistics/Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
| | - Kunle Odunsi
- Department of Immunology,, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
- Department of Gynecologic Oncology,, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
- Center for Immunotherapy, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA
| | - Brahm H Segal
- Department of Internal Medicine,, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA.
- Department of Immunology,, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA.
- Departments of Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, 14203, USA.
| | - Bora E Baysal
- Department of Pathology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14203, USA.
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6
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Li F, Zou Y, Han MG, Foyevtsova K, Shin H, Lee S, Liu C, Shin K, Albright SD, Sutarto R, He F, Davidson BA, Walker FJ, Ahn CH, Zhu Y, Cheng ZG, Elfimov I, Sawatzky GA, Zou K. Single-crystalline epitaxial TiO film: A metal and superconductor, similar to Ti metal. Sci Adv 2021; 7:7/2/eabd4248. [PMID: 33523988 PMCID: PMC7793583 DOI: 10.1126/sciadv.abd4248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 11/10/2020] [Indexed: 06/12/2023]
Abstract
Titanium monoxide (TiO), an important member of the rock salt 3d transition-metal monoxides, has not been studied in the stoichiometric single-crystal form. It has been challenging to prepare stoichiometric TiO due to the highly reactive Ti2+ We adapt a closely lattice-matched MgO(001) substrate and report the successful growth of single-crystalline TiO(001) film using molecular beam epitaxy. This enables a first-time study of stoichiometric TiO thin films, showing that TiO is metal but in proximity to Mott insulating state. We observe a transition to the superconducting phase below 0.5 K close to that of Ti metal. Density functional theory (DFT) and a DFT-based tight-binding model demonstrate the extreme importance of direct Ti-Ti bonding in TiO, suggesting that similar superconductivity exists in TiO and Ti metal. Our work introduces the new concept that TiO behaves more similar to its metal counterpart, distinguishing it from other 3d transition-metal monoxides.
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Affiliation(s)
- Fengmiao Li
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Yuting Zou
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Myung-Geun Han
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Kateryna Foyevtsova
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Hyungki Shin
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Sangjae Lee
- Department of Physics, Yale University, New Haven, CT 06520, USA
| | - Chong Liu
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Kidae Shin
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA
| | | | - Ronny Sutarto
- Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Feizhou He
- Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Bruce A Davidson
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Frederick J Walker
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA
| | - Charles H Ahn
- Department of Physics, Yale University, New Haven, CT 06520, USA
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA
| | - Yimei Zhu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Zhi Gang Cheng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Ilya Elfimov
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - George A Sawatzky
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Ke Zou
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
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7
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Huang WC, Zhou S, He X, Chiem K, Mabrouk MT, Nissly RH, Bird IM, Strauss M, Sambhara S, Ortega J, Wohlfert EA, Martinez-Sobrido L, Kuchipudi SV, Davidson BA, Lovell JF. SARS-CoV-2 RBD Neutralizing Antibody Induction is Enhanced by Particulate Vaccination. Adv Mater 2020. [PMID: 33111375 DOI: 10.1002/adma.v32.5010.1002/adma.202005637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The receptor-binding domain (RBD) of the SARS-CoV-2 spike protein is a candidate vaccine antigen that binds angiotensin-converting enzyme 2 (ACE2), leading to virus entry. Here, it is shown that rapid conversion of recombinant RBD into particulate form via admixing with liposomes containing cobalt-porphyrin-phospholipid (CoPoP) potently enhances the functional antibody response. Antigen binding via His-tag insertion into the CoPoP bilayer results in a serum-stable and conformationally intact display of the RBD on the liposome surface. Compared to other vaccine formulations, immunization using CoPoP liposomes admixed with recombinant RBD induces multiple orders of magnitude higher levels of antibody titers in mice that neutralize pseudovirus cell entry, block RBD interaction with ACE2, and inhibit live virus replication. Enhanced immunogenicity can be accounted for by greater RBD uptake into antigen-presenting cells in particulate form and improved immune cell infiltration in draining lymph nodes. QS-21 inclusion in the liposomes results in an enhanced antigen-specific polyfunctional T cell response. In mice, high dose immunization results in minimal local reactogenicity, is well-tolerated, and does not elevate serum cobalt levels. Taken together, these results confirm that particulate presentation strategies for the RBD immunogen should be considered for inducing strongly neutralizing antibody responses against SARS-CoV-2.
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Affiliation(s)
- Wei-Chiao Huang
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA
| | - Shiqi Zhou
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA
| | - Xuedan He
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA
| | - Kevin Chiem
- Texas Biomedical Research Institute, San Antonio, TX, 78227, USA
| | - Moustafa T Mabrouk
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA
| | - Ruth H Nissly
- Animal Diagnostic Laboratory, Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA, 16802, USA
| | - Ian M Bird
- Animal Diagnostic Laboratory, Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA, 16802, USA
| | - Mike Strauss
- Department of Anatomy and Cell Biology, McGill University Montreal, Quebec, H3A 0C7, Canada
| | - Suryaprakash Sambhara
- Immunology and Pathogenesis Branch, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA, 30329-4027, USA
| | - Joaquin Ortega
- Department of Anatomy and Cell Biology, McGill University Montreal, Quebec, H3A 0C7, Canada
| | - Elizabeth A Wohlfert
- Department of Microbiology and Immunology, University at Buffalo, State University of New York, Buffalo, NY, 14203, USA
| | | | - Suresh V Kuchipudi
- Animal Diagnostic Laboratory, Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA, 16802, USA
- Animal Diagnostic Laboratory, Department of Veterinary and Biomedical Sciences, The Center for Infectious Disease Dynamics, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Bruce A Davidson
- Department of Anesthesiology, Department of Pathology and Anatomical Sciences, University at Buffalo, State University of New York, Buffalo, NY, 14203, USA
| | - Jonathan F Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA
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8
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Huang W, Zhou S, He X, Chiem K, Mabrouk MT, Nissly RH, Bird IM, Strauss M, Sambhara S, Ortega J, Wohlfert EA, Martinez‐Sobrido L, Kuchipudi SV, Davidson BA, Lovell JF. SARS-CoV-2 RBD Neutralizing Antibody Induction is Enhanced by Particulate Vaccination. Adv Mater 2020; 32:e2005637. [PMID: 33111375 PMCID: PMC7645956 DOI: 10.1002/adma.202005637] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 09/25/2020] [Indexed: 05/21/2023]
Abstract
The receptor-binding domain (RBD) of the SARS-CoV-2 spike protein is a candidate vaccine antigen that binds angiotensin-converting enzyme 2 (ACE2), leading to virus entry. Here, it is shown that rapid conversion of recombinant RBD into particulate form via admixing with liposomes containing cobalt-porphyrin-phospholipid (CoPoP) potently enhances the functional antibody response. Antigen binding via His-tag insertion into the CoPoP bilayer results in a serum-stable and conformationally intact display of the RBD on the liposome surface. Compared to other vaccine formulations, immunization using CoPoP liposomes admixed with recombinant RBD induces multiple orders of magnitude higher levels of antibody titers in mice that neutralize pseudovirus cell entry, block RBD interaction with ACE2, and inhibit live virus replication. Enhanced immunogenicity can be accounted for by greater RBD uptake into antigen-presenting cells in particulate form and improved immune cell infiltration in draining lymph nodes. QS-21 inclusion in the liposomes results in an enhanced antigen-specific polyfunctional T cell response. In mice, high dose immunization results in minimal local reactogenicity, is well-tolerated, and does not elevate serum cobalt levels. Taken together, these results confirm that particulate presentation strategies for the RBD immunogen should be considered for inducing strongly neutralizing antibody responses against SARS-CoV-2.
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Affiliation(s)
- Wei‐Chiao Huang
- Department of Biomedical EngineeringUniversity at BuffaloState University of New YorkBuffaloNY14260USA
| | - Shiqi Zhou
- Department of Biomedical EngineeringUniversity at BuffaloState University of New YorkBuffaloNY14260USA
| | - Xuedan He
- Department of Biomedical EngineeringUniversity at BuffaloState University of New YorkBuffaloNY14260USA
| | - Kevin Chiem
- Texas Biomedical Research InstituteSan AntonioTX78227USA
| | - Moustafa T. Mabrouk
- Department of Biomedical EngineeringUniversity at BuffaloState University of New YorkBuffaloNY14260USA
| | - Ruth H. Nissly
- Animal Diagnostic LaboratoryDepartment of Veterinary and Biomedical SciencesPennsylvania State UniversityUniversity ParkPA16802USA
| | - Ian M. Bird
- Animal Diagnostic LaboratoryDepartment of Veterinary and Biomedical SciencesPennsylvania State UniversityUniversity ParkPA16802USA
| | - Mike Strauss
- Department of Anatomy and Cell BiologyMcGill University MontrealQuebecH3A 0C7Canada
| | - Suryaprakash Sambhara
- Immunology and Pathogenesis BranchCenters for Disease Control and Prevention1600 Clifton RoadAtlantaGA30329‐4027USA
| | - Joaquin Ortega
- Department of Anatomy and Cell BiologyMcGill University MontrealQuebecH3A 0C7Canada
| | - Elizabeth A. Wohlfert
- Department of Microbiology and ImmunologyUniversity at BuffaloState University of New YorkBuffaloNY14203USA
| | | | - Suresh V. Kuchipudi
- Animal Diagnostic LaboratoryDepartment of Veterinary and Biomedical SciencesPennsylvania State UniversityUniversity ParkPA16802USA
- Animal Diagnostic LaboratoryDepartment of Veterinary and Biomedical SciencesThe Center for Infectious Disease DynamicsThe Pennsylvania State UniversityUniversity ParkPA16802USA
| | - Bruce A. Davidson
- Department of AnesthesiologyDepartment of Pathology and Anatomical SciencesUniversity at BuffaloState University of New YorkBuffaloNY14203USA
| | - Jonathan F. Lovell
- Department of Biomedical EngineeringUniversity at BuffaloState University of New YorkBuffaloNY14260USA
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9
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Vinai G, Motti F, Petrov AY, Polewczyk V, Bonanni V, Edla R, Gobaut B, Fujii J, Suran F, Benedetti D, Salvador F, Fondacaro A, Rossi G, Panaccione G, Davidson BA, Torelli P. An integrated ultra-high vacuum apparatus for growth and in situ characterization of complex materials. Rev Sci Instrum 2020; 91:085109. [PMID: 32872955 DOI: 10.1063/5.0005302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 07/29/2020] [Indexed: 06/11/2023]
Abstract
Here, we present an integrated ultra-high vacuum apparatus-named MBE-Cluster -dedicated to the growth and in situ structural, spectroscopic, and magnetic characterization of complex materials. Molecular Beam Epitaxy (MBE) growth of metal oxides, e.g., manganites, and deposition of the patterned metallic layers can be fabricated and in situ characterized by reflection high-energy electron diffraction, low-energy electron diffraction, Auger electron spectroscopy, x-ray photoemission spectroscopy, and azimuthal longitudinal magneto-optic Kerr effect. The temperature can be controlled in the range from 5 K to 580 K, with the possibility of application of magnetic fields H up to ±7 kOe and electric fields E for voltages up to ±500 V. The MBE-Cluster operates for in-house research as well as user facility in combination with the APE beamlines at Sincrotrone-Trieste and the high harmonic generator facility for time-resolved spectroscopy.
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Affiliation(s)
- G Vinai
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - F Motti
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - A Yu Petrov
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - V Polewczyk
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - V Bonanni
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - R Edla
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - B Gobaut
- Elettra-Sincrotrone Trieste S.C.p.A, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - J Fujii
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - F Suran
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - D Benedetti
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - F Salvador
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - A Fondacaro
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - G Rossi
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - G Panaccione
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - B A Davidson
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - P Torelli
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
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10
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Bohannon CD, Ende Z, Cao W, Mboko W, Ranjan P, Kumar A, Mishina M, Amoah S, Gangappa S, Mittal SK, Garcia-Sastre A, Pfeifer B, Davidson BA, Knight P, Sambhara S. Influenza virus suppresses the adaptive immune response leaving immune hosts vulnerable to influenza and other respiratory pathogens. The Journal of Immunology 2020. [DOI: 10.4049/jimmunol.204.supp.93.24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Influenza infections are associated with several million cases of severe respiratory illness, hospitalizations, and hundreds of thousands of deaths globally. Secondary infections further complicate influenza’s high morbidity and mortality, and significantly factored into the severity of the 1918, 1968, and 2009 pandemics. The most common coinfections are bacterial, leading to bacterial pneumonia, though viral secondary infections also occur. Previous studies have shown that influenza can target innate responses and damage affected tissues, allowing for secondary infections. In this study we show that influenza virus targets not only innate immune responses but also the adaptive responses - specifically activated B cells, T cells, and NKT cells. Importantly, we demonstrate that infection with influenza virus can attenuate the adaptive responses to prior influenza vaccination and to other respiratory pathogen vaccinations, in humans and in mouse models. This occurs through a viral hijacking of the normal immune responses by taking advantage of elevated expression of sialic acid receptors on activated lymphocytes to preferentially infect and kill immune responders. Our findings provide a novel potential mechanism for the high incidence of secondary respiratory infections due to bacteria and other viruses, as well as for vaccine failures against other infectious agents during influenza seasons.
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Affiliation(s)
- Caitlin D Bohannon
- 1Centers for Disease Control (CDC)
- 2Oak Ridge Institute for Science and Education (ORISE)
| | - Zachary Ende
- 1Centers for Disease Control (CDC)
- 2Oak Ridge Institute for Science and Education (ORISE)
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11
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Singh N, Ranjan P, Cao W, Patel J, Gangappa S, Davidson BA, Sullivan JM, Prasad PN, Knight PR, Sambhara S. A Dual-Functioning 5'-PPP-NS1shRNA that Activates a RIG-I Antiviral Pathway and Suppresses Influenza NS1. Mol Ther Nucleic Acids 2020; 19:1413-1422. [PMID: 32160710 PMCID: PMC7049568 DOI: 10.1016/j.omtn.2020.01.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 01/19/2020] [Indexed: 12/25/2022]
Abstract
Retinoic acid-inducible gene-I (RIG-I) is a cytosolic pathogen sensor that is crucial against a number of viral infections. Many viruses have evolved to inhibit pathogen sensors to suppress host innate immune responses. In the case of influenza, nonstructural protein 1 (NS1) suppresses RIG-I function, leading to viral replication, morbidity, and mortality. We show that silencing NS1 with in-vitro-transcribed 5'-triphosphate containing NS1 short hairpin RNA (shRNA) (5'-PPP-NS1shRNA), designed using the conserved region of a number of influenza viruses, not only prevented NS1 expression but also induced RIG-I activation and type I interferon (IFN) expression, resulting in an antiviral state leading to inhibition of influenza virus replication in vitro. In addition, administration of 5'-PPP-NS1shRNA in prophylactic and therapeutic settings resulted in significant inhibition of viral replication following viral challenge in vivo in mice with corresponding increases of RIG-I, IFN-β, and IFN-λ, as well as a decrease in NS1 expression.
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Affiliation(s)
- Neetu Singh
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329, USA
| | - Priya Ranjan
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329, USA
| | - Weiping Cao
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329, USA
| | - Jenish Patel
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329, USA
| | - Shivaprakash Gangappa
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329, USA
| | - Bruce A Davidson
- Department of Anesthesiology, State University of New York at Buffalo, Buffalo, NY 14203, USA; Department of Pathology and Anatomical Sciences, State University of New York at Buffalo, Buffalo, NY 14203, USA; Veterans Administration Western New York Healthcare System, Buffalo, NY 14215, USA
| | - John M Sullivan
- Department of Ophthalmology, State University of New York at Buffalo, Buffalo, NY 14203, USA; Veterans Administration Western New York Healthcare System, Buffalo, NY 14215, USA
| | - Paras N Prasad
- Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14203, USA; Institute for Laser, Photonics, and Biophotonics, State University of New York at Buffalo, Buffalo, NY 14203, USA
| | - Paul R Knight
- Department of Anesthesiology, State University of New York at Buffalo, Buffalo, NY 14203, USA.
| | - Suryaprakash Sambhara
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329, USA.
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12
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Abstract
Historically, volatile anesthetics have demonstrated interesting interactions with both the innate and adaptive immune systems. This review organizes these interactions into four phases: recognition, recruitment, response, and resolution. These phases represent a range of proinflammatory, inflammatory, and innate and adaptive immune regulatory responses. The interaction between volatile anesthetics and the immune system is discussed in the context of pathogenesis of infectious disease.
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Affiliation(s)
| | - Hilliard L Kutscher
- b Institute for Lasers, Photonics and Biophotonics , University of Buffalo, State University of New York , Buffalo , NY USA
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13
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Jones CH, Zhang G, Nayerhoda R, Beitelshees M, Hill A, Rostami P, Li Y, Davidson BA, Knight P, Pfeifer BA. Comprehensive vaccine design for commensal disease progression. Sci Adv 2017; 3:e1701797. [PMID: 29057325 PMCID: PMC5647123 DOI: 10.1126/sciadv.1701797] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Accepted: 09/20/2017] [Indexed: 06/07/2023]
Abstract
Commensal organisms with the potential to cause disease pose a challenge in developing treatment options. Using the example featured in this study, pneumococcal disease begins with Streptococcus pneumoniae colonization, followed by triggering events that prompt the release of a virulent subpopulation of bacteria. Current vaccines focus on colonization prevention, which poses unintended consequences of serotype niche replacement. In this study, noncovalent colocalization of two classes of complementary antigens, one to prevent the colonization of the most aggressive S. pneumoniae serotypes and another to restrict virulence transition, provides complete vaccine effectiveness in animal subjects and the most comprehensive coverage of disease reported to date. As a result, the proposed vaccine formulation offers universal pneumococcal disease prevention with the prospect of effectively managing a disease that afflicts tens to hundreds of millions globally. The approach more generally puts forth a balanced prophylactic treatment strategy in response to complex commensal-host dynamics.
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Affiliation(s)
| | - Guojian Zhang
- Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Roozbeh Nayerhoda
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Marie Beitelshees
- Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Andrew Hill
- Abcombi Biosciences Inc., Buffalo, NY 14228, USA
- Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Pooya Rostami
- New York University Langone Medical Center, Brooklyn, NY 11229, USA
| | - Yi Li
- Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Bruce A. Davidson
- Department of Anesthesiology, University at Buffalo, State University of New York, Buffalo, NY 14214, USA
| | - Paul Knight
- Department of Anesthesiology, University at Buffalo, State University of New York, Buffalo, NY 14214, USA
- Department of Microbiology and Immunology, University at Buffalo, State University of New York, Buffalo, NY 14214, USA
| | - Blaine A. Pfeifer
- Department of Chemical and Biological Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
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14
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Alluri R, Kutscher HL, Mullan BA, Davidson BA, Knight PR. Open Tracheostomy Gastric Acid Aspiration Murine Model of Acute Lung Injury Results in Maximal Acute Nonlethal Lung Injury. J Vis Exp 2017. [PMID: 28287530 DOI: 10.3791/54700] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Acid pneumonitis is a major cause of sterile acute lung injury (ALI) in humans. Acid pneumonitis spans the clinical spectrum from asymptomatic to acute respiratory distress syndrome (ARDS), characterized by neutrophilic alveolitis, and injury to both alveolar epithelium and vascular endothelium. Clinically, ARDS is defined by acute onset of hypoxemia, bilateral patchy pulmonary infiltrates and non-cardiogenic pulmonary edema. Human studies have provided us with valuable information about the physiological and inflammatory changes in the lung caused by ARDS, which has led to various hypotheses about the underling mechanisms. Unfortunately, difficulties determining the etiology of ARDS, as well as a wide range of pathophysiology have resulted in a lack of critical information that could be useful in developing therapeutic strategies. Translational animal models are valuable when their pathogenesis and pathophysiology accurately reproduce a concept proven in both in vitro and clinical settings. Although large animal models (e.g., sheep) share characteristics of the anatomy of human trachea-bronchial tree, murine models provide a host of other advantages including: low cost; short reproductive cycle lending itself to greater data acquisition; a well understood immunologic system; and a well characterized genome leading to the availability of a variety of gene deletion and transgenic strains. A robust model of low pH induced ARDS requires a murine ALI that targets mainly the alveolar epithelium, secondarily the vascular endothelium, as well as the small airways leading to the alveoli. Furthermore, a reproducible injury with wide differences between different injurious and non-injurious insults is important. The murine gastric acid aspiration model presented here using hydrochloric acid employs an open tracheostomy and recreates a pathogenic scenario that reproduces the low pH pneumonitis injury in humans. Additionally, this model can be used to examine interaction of a low pH insult with other pulmonary injurious entities (e.g., food particles, pathogenic bacteria).
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Affiliation(s)
- Ravi Alluri
- Department of Anesthesiology, University at Buffalo, State University of New York; Department of Anesthsiology, Veterans Admistration Western New York Healthcare System
| | - Hilliard L Kutscher
- Institute of Lasers, Photonics and Biophotonics, University at Buffalo, State University of New York
| | - Barbara A Mullan
- Department of Anesthesiology, University at Buffalo, State University of New York; Department of Anesthsiology, Veterans Admistration Western New York Healthcare System
| | - Bruce A Davidson
- Department of Anesthesiology, University at Buffalo, State University of New York; Department of Anesthsiology, Veterans Admistration Western New York Healthcare System
| | - Paul R Knight
- Department of Anesthesiology, University at Buffalo, State University of New York; Department of Anesthsiology, Veterans Admistration Western New York Healthcare System;
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15
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Chandrasena RU, Yang W, Lei Q, Delgado-Jaime MU, Wijesekara KD, Golalikhani M, Davidson BA, Arenholz E, Kobayashi K, Kobata M, de Groot FMF, Aschauer U, Spaldin NA, Xi X, Gray AX. Strain-Engineered Oxygen Vacancies in CaMnO 3 Thin Films. Nano Lett 2017; 17:794-799. [PMID: 28103040 DOI: 10.1021/acs.nanolett.6b03986] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We demonstrate a novel pathway to control and stabilize oxygen vacancies in complex transition-metal oxide thin films. Using atomic layer-by-layer pulsed laser deposition (PLD) from two separate targets, we synthesize high-quality single-crystalline CaMnO3 films with systematically varying oxygen vacancy defect formation energies as controlled by coherent tensile strain. The systematic increase of the oxygen vacancy content in CaMnO3 as a function of applied in-plane strain is observed and confirmed experimentally using high-resolution soft X-ray absorption spectroscopy (XAS) in conjunction with bulk-sensitive hard X-ray photoemission spectroscopy (HAXPES). The relevant defect states in the densities of states are identified and the vacancy content in the films quantified using the combination of first-principles theory and core-hole multiplet calculations with holistic fitting. Our findings open up a promising avenue for designing and controlling new ionically active properties and functionalities of complex transition-metal oxides via strain-induced oxygen-vacancy formation and ordering.
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Affiliation(s)
- Ravini U Chandrasena
- Department of Physics, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
- Temple Materials Institute, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
| | - Weibing Yang
- Department of Physics, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
- Temple Materials Institute, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
| | - Qingyu Lei
- Department of Physics, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
- Temple Materials Institute, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
| | - Mario U Delgado-Jaime
- Inorganic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Utrecht University , Universiteitsweg 99, Utrecht 3584 CG, The Netherlands
| | - Kanishka D Wijesekara
- Department of Physics, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
- Temple Materials Institute, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
| | - Maryam Golalikhani
- Department of Physics, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
- Temple Materials Institute, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
| | - Bruce A Davidson
- Department of Physics, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
| | - Elke Arenholz
- Advanced Light Source, Lawrence Berkeley National Laboratory , One Cyclotron Road, Berkeley, California 94720, United States
| | - Keisuke Kobayashi
- Materials Sciences Research Center, Japan Atomic Energy Agency , 1-1-1 Kouto, Sayo-cho, Hyogo 679-5148, Japan
| | - Masaaki Kobata
- Materials Sciences Research Center, Japan Atomic Energy Agency , 1-1-1 Kouto, Sayo-cho, Hyogo 679-5148, Japan
| | - Frank M F de Groot
- Inorganic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Utrecht University , Universiteitsweg 99, Utrecht 3584 CG, The Netherlands
| | - Ulrich Aschauer
- Materials Theory, ETH Zurich , Wolfgang-Pauli-Strasse 27, CH-8093 Zürich, Switzerland
- Department of Chemistry and Biochemistry, University of Bern , Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Nicola A Spaldin
- Materials Theory, ETH Zurich , Wolfgang-Pauli-Strasse 27, CH-8093 Zürich, Switzerland
| | - Xiaoxing Xi
- Department of Physics, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
- Temple Materials Institute, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
| | - Alexander X Gray
- Department of Physics, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
- Temple Materials Institute, Temple University , 1925 North 12th Street, Philadelphia, Pennsylvania 19122, United States
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16
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Li Y, Beitelshees M, Fang L, Hill A, Ahmadi MK, Chen M, Davidson BA, Knight P, Smith RJ, Andreadis ST, Hakansson AP, Jones CH, Pfeifer BA. In situ pneumococcal vaccine production and delivery through a hybrid biological-biomaterial vector. Sci Adv 2016; 2:e1600264. [PMID: 27419235 PMCID: PMC4942325 DOI: 10.1126/sciadv.1600264] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 06/06/2016] [Indexed: 05/14/2023]
Abstract
The type and potency of an immune response provoked during vaccination will determine ultimate success in disease prevention. The basis for this response will be the design and implementation of antigen presentation to the immune system. Whereas direct antigen administration will elicit some form of immunological response, a more sophisticated approach would couple the antigen of interest to a vector capable of broad delivery formats and designed for heightened response. New antigens associated with pneumococcal disease virulence were used to test the delivery and adjuvant capabilities of a hybrid biological-biomaterial vector consisting of a bacterial core electrostatically coated with a cationic polymer. The hybrid design provides (i) passive and active targeting of antigen-presenting cells, (ii) natural and multicomponent adjuvant properties, (iii) dual intracellular delivery mechanisms, and (iv) a simple formulation mechanism. In addition, the hybrid format enables device-specific, or in situ, antigen production and consolidation via localization within the bacterial component of the vector. This capability eliminates the need for dedicated antigen production and purification before vaccination efforts while leveraging the aforementioned features of the overall delivery device. We present the first disease-specific utilization of the vector toward pneumococcal disease highlighted by improved immune responses and protective capabilities when tested against traditional vaccine formulations and a range of clinically relevant Streptococcus pneumoniae strains. More broadly, the results point to similar levels of success with other diseases that would benefit from the production, delivery, and efficacy capabilities offered by the hybrid vector.
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Affiliation(s)
- Yi Li
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
| | - Marie Beitelshees
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
| | - Lei Fang
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
| | - Andrew Hill
- Abcombi Biosciences Inc., Buffalo, NY 14260–4200, USA
| | - Mahmoud Kamal Ahmadi
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
| | - Mingfu Chen
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
| | - Bruce A. Davidson
- Department of Anesthesiology, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
| | - Paul Knight
- Department of Anesthesiology, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
- Department of Microbiology and Immunology, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
| | - Randall J. Smith
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
| | - Stelios T. Andreadis
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
- Center of Excellence in Bioinformatics and Life Sciences, Buffalo, NY 14203, USA
| | - Anders P. Hakansson
- Department of Microbiology and Immunology, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
- Division of Experimental Infection Medicine, Department of Laboratory Medicine, Lund University, Malmö SE-20502, Sweden
| | - Charles H. Jones
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
- Abcombi Biosciences Inc., Buffalo, NY 14260–4200, USA
- Corresponding author. (C.H.J.); (B.A.P.)
| | - Blaine A. Pfeifer
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260–4200, USA
- Abcombi Biosciences Inc., Buffalo, NY 14260–4200, USA
- Corresponding author. (C.H.J.); (B.A.P.)
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17
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Li Y, Hill A, Beitelshees M, Shao S, Lovell JF, Davidson BA, Knight PR, Hakansson AP, Pfeifer BA, Jones CH. Directed vaccination against pneumococcal disease. Proc Natl Acad Sci U S A 2016; 113:6898-903. [PMID: 27274071 PMCID: PMC4922154 DOI: 10.1073/pnas.1603007113] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Immunization strategies against commensal bacterial pathogens have long focused on eradicating asymptomatic carriage as well as disease, resulting in changes in the colonizing microflora with unknown future consequences. Additionally, current vaccines are not easily adaptable to sequence diversity and immune evasion. Here, we present a "smart" vaccine that leverages our current understanding of disease transition from bacterial carriage to infection with the pneumococcus serving as a model organism. Using conserved surface proteins highly expressed during virulent transition, the vaccine mounts an immune response specifically against disease-causing bacterial populations without affecting carriage. Aided by a delivery technology capable of multivalent surface display, which can be adapted easily to a changing clinical picture, results include complete protection against the development of pneumonia and sepsis during animal challenge experiments with multiple, highly variable, and clinically relevant pneumococcal isolates. The approach thus offers a unique and dynamic treatment option readily adaptable to other commensal pathogens.
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Affiliation(s)
- Yi Li
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260
| | | | - Marie Beitelshees
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260
| | - Shuai Shao
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260
| | - Jonathan F Lovell
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260
| | - Bruce A Davidson
- Department of Anesthesiology, University at Buffalo, The State University of New York, Buffalo, NY 14260
| | - Paul R Knight
- Department of Anesthesiology, University at Buffalo, The State University of New York, Buffalo, NY 14260; Department of Microbiology and Immunology, University at Buffalo, The State University of New York, Buffalo, NY 14260
| | - Anders P Hakansson
- Department of Microbiology and Immunology, University at Buffalo, The State University of New York, Buffalo, NY 14260; Division of Experimental Infection Medicine, Department of Laboratory Medicine, Lund University, SE-221 00 Malmo, Sweden
| | - Blaine A Pfeifer
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260; Abcombi Biosciences Inc., Buffalo, NY 14260;
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Gerard E, Spengler RN, Bonoiu AC, Mahajan SD, Davidson BA, Ding H, Kumar R, Prasad PN, Knight PR, Ignatowski TA. Chronic constriction injury-induced nociception is relieved by nanomedicine-mediated decrease of rat hippocampal tumor necrosis factor. Pain 2015; 156:1320-1333. [PMID: 25851457 PMCID: PMC4474806 DOI: 10.1097/j.pain.0000000000000181] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Neuropathic pain is a chronic pain syndrome that arises from nerve injury. Current treatments only offer limited relief, clearly indicating the need for more effective therapeutic strategies. Previously, we demonstrated that proinflammatory tumor necrosis factor-alpha (TNF) is a key mediator of neuropathic pain pathogenesis; TNF is elevated at sites of neuronal injury, in the spinal cord, and supraspinally during the initial development of pain. The inhibition of TNF action along pain pathways outside higher brain centers results in transient decreases in pain perception. The objective of this study was to determine whether specific blockade of TNF in the hippocampus, a site of pain integration, could prove efficacious in reducing sciatic nerve chronic constriction injury (CCI)-induced pain behavior. Small inhibitory RNA directed against TNF mRNA was complexed to gold nanorods (GNR-TNF siRNA; TNF nanoplexes) and injected into the contralateral hippocampus of rats 4 days after unilateral CCI. Withdrawal latencies to a noxious thermal stimulus (hyperalgesia) and withdrawal to innocuous forces (allodynia) were recorded up to 10 days and compared with baseline values and sham-operated rats. Thermal hyperalgesia was dramatically decreased in CCI rats receiving hippocampal TNF nanoplexes; and mechanical allodynia was transiently relieved. TNF levels (bioactive protein, TNF immunoreactivity) in hippocampal tissue were decreased. The observation that TNF nanoplex injection into the hippocampus alleviated neuropathic pain-like behavior advances our previous findings that hippocampal TNF levels modulate pain perception. These data provide evidence that targeting TNF in the brain using nanoparticle-protected siRNA may be an effective strategy for treatment of neuropathic pain.
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Affiliation(s)
- Elizabeth Gerard
- Department of Pathology and Anatomical Sciences, University at Buffalo, The State University of New York
| | | | - Adela C. Bonoiu
- Institute for Lasers, Photonics, and Biophotonics, University at Buffalo, The State University of New York
| | - Supriya D. Mahajan
- Department of Medicine, Division of Allergy, Immunology, and Rheumatology, University at Buffalo, The State University of New York
| | - Bruce A. Davidson
- Department of Pathology and Anatomical Sciences, University at Buffalo, The State University of New York
- NanoAxis, LLC, Clarence, New York 14031
- Department of Anesthesiology, University at Buffalo, The State University of New York
- Veterans Administration Western New York Healthcare System
| | - Hong Ding
- Institute for Lasers, Photonics, and Biophotonics, University at Buffalo, The State University of New York
| | - Rajiv Kumar
- Institute for Lasers, Photonics, and Biophotonics, University at Buffalo, The State University of New York
| | - Paras N. Prasad
- Institute for Lasers, Photonics, and Biophotonics, University at Buffalo, The State University of New York
- Department of Chemistry, University at Buffalo, The State University of New York
| | - Paul R. Knight
- NanoAxis, LLC, Clarence, New York 14031
- Institute for Lasers, Photonics, and Biophotonics, University at Buffalo, The State University of New York
- Department of Anesthesiology, University at Buffalo, The State University of New York
- Veterans Administration Western New York Healthcare System
- Department of Microbiology and Immunology, University at Buffalo, The State University of New York
| | - Tracey A. Ignatowski
- Department of Pathology and Anatomical Sciences, University at Buffalo, The State University of New York
- NanoAxis, LLC, Clarence, New York 14031
- Program for Neuroscience, University at Buffalo, The State University of New York
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Petrov AY, Torrelles X, Verna A, Xu H, Cossaro A, Pedio M, Garcia-Barriocanal J, Castro GR, Davidson BA. Surface octahedral distortions and atomic design of perovskite interfaces. Adv Mater 2013; 25:4043-4048. [PMID: 23813784 DOI: 10.1002/adma.201301841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Indexed: 06/02/2023]
Abstract
Atomic engineering of perovskite films and interfaces is significantly improved by in situ optimization of reflection high-energy electron diffraction (RHEED) features resulting from surface BO₆ octahedral rotations seen during molecular-beam epitaxy growth. This approach yields Sr-doped manganite films across the phase diagram with magnetotransport properties that are, for the first time, identical to bulk single crystals. Careful structural analysis of manganite/titanate interfaces shows that cation intermixing and unit cell dilations are eliminated, while BO₆ rotations and Jahn-Teller-type elongations are nearly completely suppressed at the interface.
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Affiliation(s)
- A Yu Petrov
- CNR-IOM TASC National Laboratory, Area Science Park-Basovizza, 34149 Trieste, Italy
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Grimm MJ, Vethanayagam RR, Almyroudis NG, Dennis CG, Khan ANH, D'Auria AC, Singel KL, Davidson BA, Knight PR, Blackwell TS, Hohl TM, Mansour MK, Vyas JM, Röhm M, Urban CF, Kelkka T, Holmdahl R, Segal BH. Monocyte- and macrophage-targeted NADPH oxidase mediates antifungal host defense and regulation of acute inflammation in mice. J Immunol 2013; 190:4175-84. [PMID: 23509361 DOI: 10.4049/jimmunol.1202800] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Chronic granulomatous disease, an inherited disorder of the NADPH oxidase in which phagocytes are defective in the generation of superoxide anion and downstream reactive oxidant species, is characterized by severe bacterial and fungal infections and excessive inflammation. Although NADPH oxidase isoforms exist in several lineages, reactive oxidant generation is greatest in neutrophils, where NADPH oxidase has been deemed vital for pathogen killing. In contrast, the function and importance of NADPH oxidase in macrophages are less clear. Therefore, we evaluated susceptibility to pulmonary aspergillosis in globally NADPH oxidase-deficient mice versus transgenic mice with monocyte/macrophage-targeted NADPH oxidase activity. We found that the lethal inoculum was >100-fold greater in transgenic versus globally NADPH oxidase-deficient mice. Consistent with these in vivo results, NADPH oxidase in mouse alveolar macrophages limited germination of phagocytosed Aspergillus fumigatus spores. Finally, globally NADPH oxidase-deficient mice developed exuberant neutrophilic lung inflammation and proinflammatory cytokine responses to zymosan, a fungal cell wall-derived product composed principally of particulate β-glucans, whereas inflammation in transgenic and wild-type mice was mild and transient. Taken together, our studies identify a central role for monocyte/macrophage NADPH oxidase in controlling fungal infection and in limiting acute lung inflammation.
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Affiliation(s)
- Melissa J Grimm
- Department of Medicine, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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Almyroudis NG, Grimm MJ, Davidson BA, Röhm M, Urban CF, Segal BH. NETosis and NADPH oxidase: at the intersection of host defense, inflammation, and injury. Front Immunol 2013; 4:45. [PMID: 23459634 PMCID: PMC3585429 DOI: 10.3389/fimmu.2013.00045] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Accepted: 02/07/2013] [Indexed: 01/13/2023] Open
Abstract
Neutrophils are armed with both oxidant-dependent and -independent pathways for killing pathogens. Activation of the phagocyte nicotinamide adenine dinucleotide phosphate (NADPH) oxidase constitutes an emergency response to infectious threat and results in the generation of antimicrobial reactive oxidants. In addition, NADPH oxidase activation in neutrophils is linked to activation of granular proteases and generation of neutrophil extracellular traps (NETs). NETosis involves the release of nuclear and granular components that can target extracellular pathogens. NETosis is activated during microbial threat and in certain conditions mimicking sepsis, and can result in both augmented host defense and inflammatory injury. In contrast, apoptosis, the physiological form of neutrophil death, not only leads to non-inflammatory cell death but also contributes to alleviate inflammation. Although there are significant gaps in knowledge regarding the specific contribution of NETs to host defense, we speculate that the coordinated activation of NADPH oxidase and NETosis maximizes microbial killing. Work in engineered mice and limited patient experience point to varying susceptibility of bacterial and fungal pathogens to NADPH oxidase versus NET constituents. Since reactive oxidants and NET constituents can injure host tissue, it is important that these pathways be tightly regulated. Recent work supports a role for NETosis in both acute lung injury and in autoimmunity. Knowledge gained about mechanisms that modulate NETosis may lead to novel therapeutic approaches to limit inflammation-associated injury.
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Affiliation(s)
- Nikolaos G Almyroudis
- Division of Infectious Diseases, Department of Medicine, University at Buffalo School of Medicine Buffalo, NY, USA ; Department of Medicine, Roswell Park Cancer Institute Buffalo, NY, USA
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Davidson BA, Vethanayagam RR, Grimm MJ, Mullan BA, Raghavendran K, Blackwell TS, Freeman ML, Ayyasamy V, Singh KK, Sporn MB, Itagaki K, Hauser CJ, Knight PR, Segal BH. NADPH oxidase and Nrf2 regulate gastric aspiration-induced inflammation and acute lung injury. J Immunol 2013; 190:1714-24. [PMID: 23296708 DOI: 10.4049/jimmunol.1202410] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Recruitment of neutrophils and release of reactive oxygen species are considered to be major pathogenic components driving acute lung injury (ALI). However, NADPH oxidase, the major source of reactive oxygen species in activated phagocytes, can paradoxically limit inflammation and injury. We hypothesized that NADPH oxidase protects against ALI by limiting neutrophilic inflammation and activating Nrf2, a transcriptional factor that induces antioxidative and cytoprotective pathways. Our objective was to delineate the roles of NADPH oxidase and Nrf2 in modulating acute lung inflammation and injury in clinically relevant models of acute gastric aspiration injury, a major cause of ALI. Acid aspiration caused increased ALI (as assessed by bronchoalveolar lavage fluid albumin concentration) in both NADPH oxidase-deficient mice and Nrf2(-/-) mice compared with wild-type mice. NADPH oxidase reduced airway neutrophil accumulation, but Nrf2 decreased ALI without affecting neutrophil recovery. Acid injury resulted in a 120-fold increase in mitochondrial DNA, a proinflammatory and injurious product of cellular necrosis, in cell-free bronchoalveolar lavage fluid. Pharmacologic activation of Nrf2 by the triterpenoid 1-[2-cyano-3-,12-dioxooleana-1,9 (11)-dien-28-oyl]imidazole limited aspiration-induced ALI in wild-type mice and reduced endothelial cell injury caused by mitochondrial extract-primed human neutrophils, leading to the conclusion that NADPH oxidase and Nrf2 have coordinated, but distinct, functions in modulating inflammation and injury. These results also point to Nrf2 as a therapeutic target to limit ALI by attenuating neutrophil-induced cellular injury.
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Affiliation(s)
- Bruce A Davidson
- Department of Anesthesiology, University at Buffalo School of Medicine, Buffalo, NY 14214, USA
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Martuscello RT, Spengler RN, Bonoiu AC, Davidson BA, Helinski J, Ding H, Mahajan S, Kumar R, Bergey EJ, Knight PR, Prasad PN, Ignatowski TA. Increasing TNF levels solely in the rat hippocampus produces persistent pain-like symptoms. Pain 2012; 153:1871-1882. [PMID: 22770843 DOI: 10.1016/j.pain.2012.05.028] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 03/19/2012] [Accepted: 05/24/2012] [Indexed: 02/07/2023]
Abstract
The manifestation of chronic, neuropathic pain includes elevated levels of the cytokine tumor necrosis factor-alpha (TNF). Previously, we have shown that the hippocampus, an area of the brain most notable for its role in learning and memory formation, plays a fundamental role in pain sensation. Using an animal model of peripheral neuropathic pain, we have demonstrated that intracerebroventricular infusion of a TNF antibody adjacent to the hippocampus completely alleviated pain. Furthermore, intracerebroventricular infusion of rTNF adjacent to the hippocampus induced pain behavior in naïve animals similar to that expressed during a model of neuropathic pain. These data support our premise that enhanced production of hippocampal-TNF is integral in pain sensation. In the present study, TNF gene expression was induced exclusively in the hippocampus, eliciting increased local bioactive TNF levels, and animals were assessed for pain behaviors. Male Sprague-Dawley rats received stereotaxic injection of gold nanorod (GNR)-complexed cDNA (control or TNF) plasmids (nanoplasmidexes), and pain responses (i.e., thermal hyperalgesia and mechanical allodynia) were measured. Animals receiving hippocampal microinjection of TNF nanoplasmidexes developed thermal hyperalgesia bilaterally. Sensitivity to mechanical stimulation also developed bilaterally in the rat hind paws. In support of these behavioral findings, immunoreactive staining for TNF, bioactive levels of TNF, and levels of TNF mRNA per polymerase chain reaction analysis were assessed in several brain regions and found to be increased only in the hippocampus. These findings indicate that the specific elevation of TNF in the hippocampus is not a consequence of pain, but in fact induces these behaviors/symptoms.
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Affiliation(s)
- Regina T Martuscello
- Department of Pathology and Anatomical Sciences, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA NanoAxis, LLC, Amherst, New York, USA Institute for Lasers, Photonics and Biophotonics, Buffalo, NY, USA Department of Anesthesiology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA Veterans Administration Western New York Healthcare System, Buffalo, NY, USA Department of Medicine, Division of Allergy, Immunology and Rheumatology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA Department of Chemistry, School of Arts and Sciences, State University of New York at Buffalo, Buffalo, NY, USA Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA Program for Neuroscience, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA
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Suresh MV, Yu B, Machado-Aranda D, Bender MD, Ochoa-Frongia L, Helinski JD, Davidson BA, Knight PR, Hogaboam CM, Moore BB, Raghavendran K. Role of macrophage chemoattractant protein-1 in acute inflammation after lung contusion. Am J Respir Cell Mol Biol 2012; 46:797-806. [PMID: 22281985 DOI: 10.1165/rcmb.2011-0358oc] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Lung contusion (LC), commonly observed in patients with thoracic trauma is a leading risk factor for development of acute lung injury/acute respiratory distress syndrome. Previously, we have shown that CC chemokine ligand (CCL)-2, a monotactic chemokine abundant in the lungs, is significantly elevated in LC. This study investigated the nature of protection afforded by CCL-2 in acute lung injury/acute respiratory distress syndrome during LC, using rats and CC chemokine receptor (CCR) 2 knockout (CCR2(-/-)) mice. Rats injected with a polyclonal antibody to CCL-2 showed higher levels of albumin and IL-6 in the bronchoalveolar lavage and myeloperoxidase in the lung tissue after LC. Closed-chest bilateral LC demonstrated CCL-2 localization in alveolar macrophages (AMs) and epithelial cells. Subsequent experiments performed using a murine model of LC showed that the extent of injury, assessed by pulmonary compliance and albumin levels in the bronchoalveolar lavage, was higher in the CCR2(-/-) mice when compared with the wild-type (WT) mice. We also found increased release of IL-1β, IL-6, macrophage inflammatory protein-1, and keratinocyte chemoattractant, lower recruitment of AMs, and higher neutrophil infiltration and phagocytic activity in CCR2(-/-) mice at 24 hours. However, impaired phagocytic activity was observed at 48 hours compared with the WT. Production of CCL-2 and macrophage chemoattractant protein-5 was increased in the absence of CCR2, thus suggesting a negative feedback mechanism of regulation. Isolated AMs in the CCR2(-/-) mice showed a predominant M1 phenotype compared with the predominant M2 phenotype in WT mice. Taken together, the above results show that CCL-2 is functionally important in the down-modulation of injury and inflammation in LC.
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Chakravarthy KV, Davidson BA, Helinski JD, Ding H, Law WC, Yong KT, Prasad PN, Knight PR. Doxorubicin-conjugated quantum dots to target alveolar macrophages and inflammation. Nanomedicine 2010; 7:88-96. [PMID: 20887813 DOI: 10.1016/j.nano.2010.09.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2009] [Revised: 08/23/2010] [Accepted: 09/02/2010] [Indexed: 10/19/2022]
Abstract
UNLABELLED The ability to provide targeted therapeutic delivery in the lung would be a major advancement in pharmacological treatments for many pulmonary diseases. Critical issues for such successful delivery would require the ability to target specific cell types, minimize toxicity (e.g., inflammatory response), and deliver therapeutic levels of drugs. We report here on the ability of nanoconjugates of CdSe/CdS/ZnS quantum dots (QDs) and doxorubicin (Dox) to target alveolar macrophages (aMØs), cells that play a critical role in the pathogenesis of inflammatory lung injuries. Confocal imaging showed the release of Dox from the QD-Dox nanoconjugate, as was evident by its accumulation in the cell nucleus and induction of apoptosis, implying that the drug retains its bioactivity after coupling to the nanoparticle. Inflammatory injury parameters (albumin leakage, proinflammatory cytokines, and neutrophil infiltration) were recorded after in vivo administration of QD-Dox and Dox, observing no significant effect after QD-Dox treatment compared with Dox. These results demonstrate that nanoparticle platforms can provide targeted macrophage-selective therapy for the treatment of pulmonary disease. FROM THE CLINICAL EDITOR Pulmonary inflammatory diseases still often remain challenging to treat, despite decades of advances and several available agents. In this study, a quantum dot-based alveolar delivery system is presented, targeting macrophages with doxorubicin.
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Affiliation(s)
- Krishnan V Chakravarthy
- Department of Microbiology and Immunology, State University of New York at Buffalo, Buffalo, New York, USA
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Abstract
This article reviews current animal models and laboratory studies investigating the pathophysiology of lung contusion (LC), a common and severe condition in patients with blunt thoracic trauma. Emphasis is on studies elucidating cells, mediators, receptors, and processes important in the innate pulmonary inflammatory response that contribute to LC injury. Surfactant dysfunction in the pathogenesis of LC is also discussed, as is the potential role of epithelial cell or neutrophil apoptosis. Studies examining combination injuries where LC is exacerbated by secondary insults such as gastric aspiration in trauma patients are also noted. The need for continuing mechanism-based research to further clarify the pathophysiology of LC injury, and to define and test potential therapeutic interventions targeting specific aspects of inflammation or surfactant dysfunction to improve clinical outcomes in patients with LC, is also emphasized.
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Raghavendran K, Davidson BA, Huebschmann JC, Helinski JD, Hutson AD, Dayton MT, Notter RH, Knight PR. Superimposed gastric aspiration increases the severity of inflammation and permeability injury in a rat model of lung contusion. J Surg Res 2008; 155:273-82. [PMID: 19515386 DOI: 10.1016/j.jss.2008.08.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2008] [Revised: 07/18/2008] [Accepted: 08/17/2008] [Indexed: 10/21/2022]
Abstract
INTRODUCTION Lung contusion (LC) from blunt thoracic trauma is a clinically-prevalent condition that can progress to acute lung injury (ALI) and acute respiratory distress syndrome (ARDS). Patients with LC are at risk for gastric aspiration at the time of trauma, but the combined insults have not been well-studied in animal models. This study tests the hypothesis that concurrent gastric aspiration (combined acid and small gastric particles, CASP) at the time of trauma significantly increases permeability injury and inflammation compared with LC alone, and also modifies the inflammatory response to include distinct features compared with the aspiration component of injury. MATERIALS AND METHODS Four groups of adult male Long-Evans rats were studied (LC, CASP, LC+CASP, uninjured controls). LC was induced in anesthetized rats at a fixed impact energy of 2.0 J, and CASP (1.2 mL/kg body weight, 40 mg particles/mL, pH=1.25) was instilled through an endotracheal tube. Lung injury and inflammation were assessed by arterial blood gases and levels of albumin, cells, and cytokines/chemokines in bronchoalveolar lavage (BAL) at 5 and 24 h. RESULTS Rats with LC+CASP had lower mean PaO(2)/FiO(2) ratios compared with LC alone at 24 h, and higher BAL albumin concentrations compared with either LC or CASP alone. Rats with LC+CASP versus LC had more severe inflammation based on higher levels of PMN in BAL at 5 h, increased whole lung myeloperoxidase (MPO) activity at 5 and 24 h, and increased levels of inflammatory mediators in BAL (TNFalpha, IL-1beta, and MCP-1 at 5 and 24 h; IL-10, MIP-2, and CINC-1 at 5 h). Rats with LC+CASP also had distinct aspects of inflammation compared with CASP alone, i.e., significantly higher levels of IL-10 (5 and 24 h), IL-1beta (24 h), CINC-1 (24 h), and MCP-1 (24 h), and significantly lower levels of MPO (5 h), MIP-2 (5 h), and CINC-1 (5 h). CONCLUSIONS Concurrent gastric aspiration can exacerbate permeability lung injury and inflammation associated with LC, and also generates a modified inflammatory response compared with aspiration alone. Unwitnessed gastric aspiration has the potential to contribute to more severe forms of LC injury associated with progression to ALI/ARDS and pneumonia in patients with thoracic trauma.
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Jamesdaniel S, Ding D, Kermany MH, Davidson BA, Knight PR, Salvi R, Coling DE. Proteomic analysis of the balance between survival and cell death responses in cisplatin-mediated ototoxicity. J Proteome Res 2008; 7:3516-24. [PMID: 18578524 DOI: 10.1021/pr8002479] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cisplatin, a widely used anticancer drug, preferentially damages outer hair cells (OHCs) of the inner ear. In this study, an antibody microarray was used to identify early changes in protein expression in the rat cochlea induced by cisplatin. Only small changes in hearing thresholds (4-34 dB elevation) were detected two days after cisplatin treatment (12 mg/kg). OHC function, measured by otoacoustic emissions, was slightly depressed (10 dB), and little or no receptor cell loss was observed. However, cisplatin induced large changes in the expression of 19 proteins involved in apoptosis, cell survival, or progression through the cell cycle. Fifteen of the proteins are novel to the study of the inner ear. Immunoblotting confirmed increases in the levels of the pro-survival activating transcription factor 2 (ATF2), of pro-apoptotic serine-threonine protein kinase, receptor interacting protein, and a 70/75 kDa nitrotyrosine bearing doublet of unknown function. Anti-nitrotyrosine antibodies localized these oxidatively damaged proteins to the stereocilia of OHCs, the Golgi-centrosome region of Hensen's cells, nuclei of outer pillar cells, and tunnel crossing fibers innervating OHCs. The results of this proteomic analysis reflect the commencement of ototoxic and cell survival responses before the observation of a significant functional or anatomical loss.
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Affiliation(s)
- Samson Jamesdaniel
- Center for Hearing and Deafness, Department of Anesthesiology, Pathology, and Microbiology and Immunology, University at Buffalo, the State University of New York, Buffalo, NY 14214, USA
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Nodzo SR, Davidson BA, Knight PR, Notter RH, Raghavendran K. 87. Surfactant Dysfunction in Lung Contusion Correlates With Severity of Lung Injury. J Surg Res 2008. [DOI: 10.1016/j.jss.2007.12.099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nodzo SR, Davidson BA, Knight PR, Notter RH, Raghavendran K. P16. Surfactant Dysfunction in Lung Contusion Correlates With Severity of Lung Injury. J Surg Res 2008. [DOI: 10.1016/j.jss.2007.12.726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Guo WA, Davidson BA, Hutson AD, Helinski JD, Dayton MT, Knight PR, Raghavendran K. 81. Biomarkers of Lung Contusion With/Without Superimposed Gastric Aspiration in Rats. J Surg Res 2008. [DOI: 10.1016/j.jss.2007.12.093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
Acute lung injury (ALI) and the acute respiratory distress syndrome (ARDS) are characterized by rapid-onset respiratory failure following a variety of direct and indirect insults to the parenchyma or vasculature of the lungs. Mortality from ALI/ARDS is substantial, and current therapy primarily emphasizes mechanical ventilation and judicial fluid management plus standard treatment of the initiating insult and any known underlying disease. Current pharmacotherapy for ALI/ARDS is not optimal, and there is a significant need for more effective medicinal chemical agents for use in these severe and lethal lung injury syndromes. To facilitate future chemical-based drug discovery research on new agent development, this paper reviews present pharmacotherapy for ALI/ARDS in the context of biological and biochemical drug activities. The complex lung injury pathophysiology of ALI/ARDS offers an array of possible targets for drug therapy, including inflammation, cell and tissue injury, vascular dysfunction, surfactant dysfunction, and oxidant injury. Added targets for pharmacotherapy outside the lungs may also be present, since multiorgan or systemic pathology is common in ALI/ARDS. The biological and physiological complexity of ALI/ARDS requires the consideration of combined-agent treatments in addition to single-agent therapies. A number of pharmacologic agents have been studied individually in ALI/ARDS, with limited or minimal success in improving survival. However, many of these agents have complementary biological/biochemical activities with the potential for synergy or additivity in combination therapy as discussed in this article.
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Affiliation(s)
- Krishnan Raghavendran
- Department of Surgery, State University of New York (SUNY) at Buffalo, Buffalo, NY 14214, USA.
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Russo TA, Davidson BA, Beanan JM, Olson R, Holm BA, Notter RH, Knight PR. Capsule and O-antigen from an extraintestinal isolate of Escherichia coli modulate cytokine levels in rat macrophages in vitro and in a rat model of pneumonia. Exp Lung Res 2007; 33:337-56. [PMID: 17849261 DOI: 10.1080/01902140701634819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Gram-negative pneumonia results in significant morbidity, mortality, and cost to the healthcare system. Previously the authors demonstrated that capsule and O-antigen, virulence factors of the extraintestinal Escherichia coli isolate CP9, modulate pulmonary neutrophil influx in a rat pneumonia model. In this report, the authors utilized CP9 and mutants deficient in O-antigen (CP921), capsule (CP9.137), or both (CP923) to test the hypothesis that modulation of cytokine levels by capsule and/or O-antigen may be a contributory mechanism. Effects of capsule and O-antigen on cytokine levels in rats in vivo and in isolated pulmonary macrophages in vitro were assessed. In vivo, capsule and O-antigen had no significant effect on tumor necrosis factor (TNF)-alpha levels in bronchoalveolar lavage fluid (BALF), but both were associated with significant increases in the levels of interleukin (IL)-1beta and Cytokine-induced neutrophil Chemoattractant-1 (CINC-1). However, potential difficulties in interpreting data occurred because challenge bacterial strains exhibited differential growth, and clearance characteristics and mixed cell populations were present. Therefore, added mechanistic studies investigated specific interactions of capsule and O-antigen with pulmonary macrophages purified from normal rats and exposed to CP9, CP921, CP9.137, or CP923 in vitro. Results indicated that the presence of capsule led to significantly increased levels of TNF-alpha, IL-1beta, and CINC-1, whereas O-antigen significantly decreased macrophage-associated levels of these mediators. These findings support the hypothesis that CP9 capsule is proinflammatory for macrophage-induced neutrophil recruitment, whereas O-antigen attenuates macrophage production of proinflammatory mediators in pneumonia. These results expand our understanding on the mechanisms by which these virulence traits may contribute to the inflammatory pathogenesis of pneumonia.
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Affiliation(s)
- Thomas A Russo
- Department of Medicine, The Witebsky Center for Microbial Pathogenesis, Veterans Administration Western New York Healthcare System, University at Buffalo-State University of New York, Buffalo, New York 14214, USA.
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Russo TA, Beanan JM, Olson R, Genagon SA, MacDonald U, Cope JJ, Davidson BA, Johnston B, Johnson JR. A killed, genetically engineered derivative of a wild-type extraintestinal pathogenic E. coli strain is a vaccine candidate. Vaccine 2007; 25:3859-70. [PMID: 17306426 PMCID: PMC1913199 DOI: 10.1016/j.vaccine.2007.01.100] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2006] [Revised: 01/18/2007] [Accepted: 01/23/2007] [Indexed: 11/28/2022]
Abstract
Infections due to extraintestinal pathogenic E. coli (ExPEC) result in significant morbidity, mortality and increased healthcare costs. An efficacious vaccine against ExPEC would be desirable. In this report, we explore the use of killed-whole E. coli as a vaccine immunogen. Given the diversity of capsule and O-antigens in ExPEC, we have hypothesized that alternative targets are viable vaccine candidates. We have also hypothesized that immunization with a genetically engineered strain that is deficient in the capsule and O-antigen will generate a greater immune response against antigens other than the capsular and O-antigen epitopes than a wild-type strain. Lastly, we hypothesize that mucosal immunization with killed E. coli has the potential to generate a significant immune response. In this study, we demonstrated that nasal immunization with a formalin-killed ExPEC derivative deficient in capsule and O-antigen results in a significantly greater overall humoral response compared to its wild-type derivative (which demonstrates that capsule and/or the O-antigen impede the development of an optimal humoral immune response) and a significantly greater immune response against non-capsular and O-antigen epitopes. These antibodies also bound to a subset of heterologous ExPEC strains and enhanced neutrophil-mediated bactericidal activity against the homologous and a heterologous strain. Taken together, these studies support the concept that formalin-killed genetically engineered ExPEC derivatives are whole cell vaccine candidates to prevent infections due to ExPEC.
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Affiliation(s)
- Thomas A Russo
- Department of Medicine, University at Buffalo, and Veterans Administration Western New York Healthcare System, Buffalo, NY 14214, United States.
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Russo TA, Wang Z, Davidson BA, Genagon SA, Beanan JM, Olson R, Holm BA, Knight PR, Chess PR, Notter RH. Surfactant dysfunction and lung injury due to the E. coli virulence factor hemolysin in a rat pneumonia model. Am J Physiol Lung Cell Mol Physiol 2007; 292:L632-43. [PMID: 17341765 DOI: 10.1152/ajplung.00326.2006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This study tests the hypothesis that the virulence factor hemolysin (Hly) expressed by extraintestinal pathogenic Escherichia coli contributes to surfactant dysfunction and lung injury in a rat model of gram-negative pneumonia. Rats were instilled intratracheally with CP9 (wild type, Hly-positive), CP9hlyA (Hly-minus), CP9/pEK50 (supraphysiological Hly), or purified LPS. At 6 h postinfection, rats given CP9 had a decreased percentage content of large surfactant aggregates in cell-free bronchoalveolar lavage (BAL), decreased large aggregate surface activity, decreased Pa(O2)/FiO2) ratio, increased BAL albumin/protein levels, and increased histological evidence of lung injury compared with rats given CP9hlyA or LPS. In addition, rats given CP9/pEK50 or CP9 had decreased large aggregate surface activity, decreased Pa(O2)/FiO2) ratios, and increased BAL albumin/protein levels at 2 h postinfection compared with rats given CP9hlyA. The severity of permeability lung injury based on albumin/protein levels in BAL at 2 h was ordered as CP9/pEK50 > CP9 > CP9hlyA > normal saline controls. Total lung titers of bacteria were increased at 6 h in rats given CP9 vs. CP9hlyA, but bacterial titers were not significantly different at 2 h, indicating that increased surfactant dysfunction and lung injury were associated with Hly as opposed to bacterial numbers per se. Further studies in vitro showed that CP9 could directly lyse transformed pulmonary epithelial cells (H441 cells) but that indirect lysis of H441 cells secondary to Hly-induced neutrophil lysis did not occur. Together, these data demonstrate that Hly is an important direct mediator of surfactant dysfunction and lung injury in gram-negative pneumonia.
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Affiliation(s)
- Thomas A Russo
- Department of Medicine, The Witebsky Center for Microbial Pathogenesis, NY, USA.
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Segal BH, Davidson BA, Hutson AD, Russo TA, Holm BA, Mullan B, Habitzruther M, Holland SM, Knight PR. Acid aspiration-induced lung inflammation and injury are exacerbated in NADPH oxidase-deficient mice. Am J Physiol Lung Cell Mol Physiol 2006; 292:L760-8. [PMID: 17114280 DOI: 10.1152/ajplung.00281.2006] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Increased reactive oxidant intermediates (ROIs) from primed leukocytes have been implicated in the pathogenesis of acid aspiration lung injury. To evaluate the specific role of the phagocyte NADPH oxidase-derived ROIs in acid lung injury, the p47phox-/- knockout mouse model of chronic granulomatous disease was used. p47phox-/- mice developed a significantly greater alveolar neutrophilic leukocytosis compared with wild-type mice at all time points after acid injury, with the difference between genotypes being most marked at 48 h. In contrast, the p47phox-/- mice had a decreased number of macrophages in bronchoalveolar lavage (BAL) compared with wild-type at 48 h after acid or saline aspiration. Albumin concentration in BAL reflecting capillary leak was also greater in p47phox-/- compared with wild-type mice. BAL concentrations of proinflammatory cytokines and chemokines were greater in p47phox-/- compared with wild-type mice. These findings suggest that NADPH oxidase, directly or indirectly, plays a role in attenuating the acute neutrophilic response after acid lung injury. We speculate that this downmodulating effect may be mediated by promoting the transition from production of cytokines and chemokines involved in neutrophilic infiltration to a less injurious, chronic inflammatory response.
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Affiliation(s)
- Brahm H Segal
- Department of Medicine, Roswell Park Cancer Institute, University at Buffalo-State University of New York, Buffalo, NY 14214-3013, USA
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Hutson AD, Davidson BA, Raghavendran K, Chess PR, Tait AR, Holm BA, Notter RH, Knight PR. Statistical prediction of the type of gastric aspiration lung injury based on early cytokine/chemokine profiles. Anesthesiology 2006; 104:73-9. [PMID: 16394693 DOI: 10.1097/00000542-200601000-00013] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Unwitnessed gastric aspiration can be a diagnostic dilemma, and early discrimination of different forms may help to identify individuals with increased risk of development of severe clinical acute lung injury or acute respiratory distress syndrome. The authors hypothesized that inflammatory mediator profiles could be used to help diagnose different types of gastric aspiration. METHODS Diagnostic modeling using a newly modified receiver operator characteristic approach was applied to recently published data from our laboratory on lavaged inflammatory mediators from rodents given intratracheal normal saline, hydrochloric acid, small nonacidified gastric particles, or a combination of acid and small gastric particles. Multiple animal groups and postaspiration times of injury were analyzed to gauge the applicability of the predictive approach: rats (6 and 24 h), C57/BL6 wild-type mice (5 and 24 h), and transgenic mice on the same background deficient in the gene for monocyte chemoattractant protein 1 (MCP-1 [-/-] mice; 5 and 24 h). RESULTS Overall, the four types of aspiration were correctly discriminated in 85 of 96 rats (89%), 72 of 78 wild-type mice (92%), and 59 of 73 MCP-1 (-/-) mice (81%) by models that used a maximum of only two mediators. The severe "two-hit" aspirate of the combination of acid and small gastric particles was correctly predicted in 21 of 24 rats, 23 of 23 wild-type mice, and 21 of 21 MCP-1 (-/-) mice. Specific best-fit mediators or mediator pairs varied with aspirate type, animal type, and time of injury. Cytokines and chemokines that best predicted the combination of acid and small gastric particles were cytokine-induced neutrophil chemoattractant 1 (6 h) and MCP-1 (24 h) in rats, tumor necrosis factor alpha/macrophage inflammatory protein 2 (5 h) and tumor necrosis factor alpha/MCP-1 (24 h) in wild-type mice, and tumor necrosis factor alpha/macrophage inflammatory protein 2 (5 h) and tumor necrosis factor alpha/keratinocyte-derived cytokine (24 h) in MCP-1 (-/-) mice. CONCLUSIONS These results support the potential feasibility of developing predictive models that use focused measurements of inflammatory mediators to help diagnose severe clinical forms of unwitnessed gastric aspiration, such as the combination of acid and small gastric particles, that may have a high risk of progression to acute lung injury/acute respiratory distress syndrome.
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Affiliation(s)
- Alan D Hutson
- Department of Biostatistics, State University of New York at Buffalo, Buffalo, New York 14214, USA
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Raghavendran K, Davidson BA, Woytash JA, Helinski JD, Marschke CJ, Manderscheid PA, Notter RH, Knight PR. The evolution of isolated bilateral lung contusion from blunt chest trauma in rats: cellular and cytokine responses. Shock 2005; 24:132-8. [PMID: 16044083 PMCID: PMC3034634 DOI: 10.1097/01.shk.0000169725.80068.4a] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Lung contusion is the leading cause of death from blunt thoracic trauma in adults, but its mechanistic pathophysiology remains unclear. This study uses a recently developed rat model to investigate the evolution of inflammation and injury in isolated lung contusion. Bilateral lung contusion with minimal cardiac trauma was induced in 54 anesthetized rats by dropping a 0.3-kg hollow cylindrical weight onto a precordial shield (impact energy, 2.45 Joules). Arterial oxygenation, pressure-volume (P-V) mechanics, histology, and levels of erythrocytes, leukocytes, albumin, and inflammatory mediators in bronchoalveolar lavage (BAL) were assessed at 8 min, at 4, 12, 24, and 48 h, and at 7 days after injury. The role of neutrophils in the evolution of inflammatory injury was also specifically studied by depleting these cells with intravenous vinblastine before lung contusion. Arterial oxygenation was severely reduced at 8 min to 24 h postcontusion, but became almost normal by 48 h. Levels of erythrocytes, leukocytes, and albumin in BAL were increased at <or=24 h, and returned toward normal by 48 h. Deficits in P-V mechanics were most apparent at 24 h postcontusion. Levels of macrophage inflammatory polypeptide-2, cytokine-induced neutrophil chemoattractant-1, and interleukin 6 in BAL peaked at 24 h, whereas monocyte chemoattractant protein-1 and interleukin 1beta peaked at 24 to 48 h postcontusion. Histology showed early hemorrhagic injury (8 min-12 h), with neutrophilic infiltration at 24 h and areas of bronchiolitis obliterans organizing pneumonia-associated fibrosis at 7 days. Vinblastine-treated neutropenic rats had significantly reduced lung injury based on total lung volume at 4 h and on BAL albumin levels at 24 h postcontusion. Inflammatory injury from isolated bilateral lung contusion in rats is most severe in the acute period (8 min-24 h) after initial blunt trauma, and includes a component of neutrophil-dependent pathology.
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Raghavendran K, Davidson BA, Helinski JD, Marschke CJ, Manderscheid P, Woytash JA, Notter RH, Knight PR. A rat model for isolated bilateral lung contusion from blunt chest trauma. Anesth Analg 2005; 101:1482-1489. [PMID: 16244015 DOI: 10.1213/01.ane.0000180201.25746.1f] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Lung contusion affects 17%-25% of adult blunt trauma patients, and is the leading cause of death from blunt thoracic injury. A small animal model for isolated bilateral lung contusion has not been developed. We induced lung contusion in anesthetized rats by dropping a 0.3-kg weight onto a precordial protective shield to direct the impact force away from the heart and toward the lungs. Lung injury was characterized as a function of chest impact energy (1.8-2.7 J) by measurements of arterial oxygenation, bronchoalveolar lavage (BAL) albumin and cytology, pressure-volume mechanics, and histopathology. Histology confirmed bilateral lung contusion without substantial cardiac muscle trauma. Rats receiving 2.7 J of chest impact energy had 33% mortality that exceeded prospectively defined limits for sublethal injury. Hypoxemia in rats with maximal sublethal injury (2.45 J) met criteria for acute lung injury at < or =24 h, improving by 48 h. BAL albumin levels were highest at < or =24 h, and remained elevated along with increased BAL leukocytes and decreased lung volumes at 48 h. We concluded that an impact energy of 2.45 J induces isolated, bilateral lung contusion and provides a useful model for future mechanistic pathophysiological assessments.
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Affiliation(s)
- Krishnan Raghavendran
- Departments of *Surgery, †Anesthesiology, and ‡Pathology, State University of New York (SUNY) at Buffalo, Buffalo; and §Department of Pediatrics, University of Rochester, Rochester, New York
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Russo TA, Davidson BA, Genagon SA, Warholic NM, Macdonald U, Pawlicki PD, Beanan JM, Olson R, Holm BA, Knight PR. E. colivirulence factor hemolysin induces neutrophil apoptosis and necrosis/lysis in vitro and necrosis/lysis and lung injury in a rat pneumonia model. Am J Physiol Lung Cell Mol Physiol 2005; 289:L207-16. [PMID: 15805136 DOI: 10.1152/ajplung.00482.2004] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Enteric gram-negative bacilli, such as Escherichia coli are the most common cause of nosocomial pneumonia. In this study a wild-type extraintestinal pathogenic strain of E. coli (ExPEC)(CP9) and isogenic derivatives deficient in hemolysin (Hly) and cytotoxic necrotizing factor (CNF) were assessed in vitro and in a rat model of gram-negative pneumonia to test the hypothesis that these virulence factors induce neutrophil apoptosis and/or necrosis/lysis. As ascertained by in vitro caspase-3/7 and LDH activities and neutrophil morphology, Hly mediated neutrophil apoptosis at lower E. coli titers (1 × 105–6cfu) and necrosis/lysis at higher titers (≥1 × 107cfu). Data suggest that CNF promotes apoptosis but not necrosis or lysis. We also demonstrate that annexin V/7-amino-actinomycin D staining was an unreliable assessment of apoptosis using live E. coli. The use of caspase-3/7 and LDH activities and neutrophil morphology supported the notion that necrosis, not apoptosis, was the primary mechanism by which neutrophils were affected in our in vivo gram-negative pneumonia model using live E. coli. In addition, in vivo studies demonstrated that Hly mediates lung injury. Neutrophil necrosis was not observed when animals were challenged with purified lipopolysaccharide, demonstrating the importance of using live bacteria. These findings establish that Hly contributes to ExPEC virulence by mediating neutrophil toxicity, with necrosis/lysis being the dominant effect of Hly on neutrophils in vivo and by lung injury. Whether Hly-mediated lung injury is due to neutrophil necrosis, a direct effect of Hly, or both is unclear.
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Affiliation(s)
- Thomas A Russo
- Dept. of Medicine, Div. of Infectious Diseases, 3435 Main St., Biomedical Research Bldg., Rm. 141, University at Buffalo, Buffalo, New York 14214, USA.
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Davidson BA, Stewart CC, Russo TA, Chess PR, Knight PR. Discrimination of resident and infiltrated alveolar macrophages by flow cytometry in influenza A virus-infected mice. Exp Lung Res 2005; 31:323-39. [PMID: 15962712 DOI: 10.1080/01902140590918524] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Laser flow cytometric analysis was used in conjunction with in vivo labeling with the lipophilic fluorescent dye DiIC18(5)-DS to discriminate resident alveolar macrophages from newly infiltrating monocytes/macrophages in mice with and without pulmonary influenza A virus infection. Leukocytes in bronchoalveolar lavage (BAL) and peripheral blood were analyzed by 2-color flow cytometry as a function of time following intravenous injection of DiIC18(5)-DS. At 4 hours, dye-positive leukocytes were present in both BAL and blood of normal mice, indicating that DiIC18(5)-DS rapidly crossed the pulmonary endothelial-epithelial barrier. At 4 days after dye injection, 98% of BAL cells were DiIC18(5)-DS positive, and almost all of these were monocytes/macrophages based on labeling with fluorescein isothiocyanate (FITC)-conjugated antibody to the Mac-3 marker. Only 3.2% +/- 0.3% of peripheral blood monocytes (approximately 0.16% of total peripheral blood leukocytes) were DiIC18(5)-DS positive at 6 days after injection, whereas > 95% of BAL leukocytes were strongly dye-positive on days 6 to 28. When DiIC18(5)-DS was injected in mice 6 days prior to intranasal challenge with influenza A, flow cytometry indicated that 57.8% 5.6% and 60.7% +/- 8.5% of macrophages/monocytes in BAL were newly infiltrated (i.e., DiIC18(5)-DS negative, Mac-3 positive) at 4 and 7 days, respectively, post viral infection. The discrimination of subpopulations of resident and newly recruited macrophages in BAL should facilitate future mechanistic studies on pulmonary infection and inflammatory lung injury.
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Affiliation(s)
- Bruce A Davidson
- Department of Anesthesiology, University at Buffalo-SUNY School of Medicine, Biomedical Research Building, Room 247, 3435 Main Street, Buffalo, NY 14214, USA.
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Nader ND, Davidson BA, Tait AR, Holm BA, Knight PR. Serine Antiproteinase Administration Preserves Innate Superoxide Dismutase Levels After Acid Aspiration and Hyperoxia but Does Not Decrease Lung Injury. Anesth Analg 2005; 101:213-9, table of contents. [PMID: 15976234 DOI: 10.1213/01.ane.0000152188.65226.fe] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Acute lung injury after acid aspiration and increased ambient oxygen result in significant oxidative damage to the lungs. Lung antioxidant levels are also reduced. Because levels of serine proteinases in the airspaces are also dramatically increased, we hypothesized that these enzymes play a role in degrading lung antioxidants. Rats were treated with a serine proteinase inhibitor, aprotinin, before pulmonary aspiration of acid in the presence of increased ambient oxygen (hyperoxia). Lung Cu/Zn and Mn superoxide dismutase (SOD) activity (by colorimetric assay) and Cu/Zn SOD immune reactive protein (enzyme-linked immunosorbent assay) were assayed. The effects of antiproteinase treatment on acute lung injury were also assessed. Total SOD, Cu/Zn SOD, and Cu/Zn SOD antigenic protein levels were decreased in animals after acid aspiration and hyperoxia. However, Mn SOD activity was unchanged. The decrease in Cu/Zn SOD was attenuated in animals, where serine proteinase activity was inhibited. However, antiproteinase treatment did not decrease acute pulmonary injury, as assessed by leakage of radiolabeled albumin into the lung (permeability index), arterial blood gases, and markers of acute inflammation (pulmonary myeloperoxidase activity, a surrogate neutrophilic marker, and inflammatory cytokine profiles). We conclude that production of serine proteinases play a major role in degrading Cu/Zn SOD, thereby decreasing pulmonary antioxidant capacity. However, the role this plays in the pathogenesis of the acute lung injury is not clear.
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Affiliation(s)
- Nader D Nader
- Department of Anesthesiology, State University of New York at Buffalo, Buffalo, NY 14215, USA.
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Davidson BA, Knight PR, Wang Z, Chess PR, Holm BA, Russo TA, Hutson A, Notter RH. Surfactant alterations in acute inflammatory lung injury from aspiration of acid and gastric particulates. Am J Physiol Lung Cell Mol Physiol 2005; 288:L699-708. [PMID: 15757954 DOI: 10.1152/ajplung.00229.2004] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
This study examines surfactant dysfunction in rats with inflammatory lung injury from intratracheal instillation of hydrochloric acid (ACID, pH 1.25), small nonacidified gastric particles (SNAP), or combined acid and small gastric particles (CASP). Rats given CASP had the most severe lung injury at 6, 24, and 48 h based on decreases in arterial oxygenation and increases in erythrocytes, total leukocytes, neutrophils, total protein, and albumin in bronchoalveolar lavage (BAL). The content of large surfactant aggregates in BAL was reduced in all forms of aspiration injury, but decreases were greatest in rats given CASP. Large aggregates from aspiration-injured rats also had decreased levels of phosphatidylcholine (PC) and increased levels of lyso-PC and total protein compared with saline controls (abnormalities for CASP were greater than for SNAP or ACID alone). The surface tension-lowering ability of large surfactant aggregates on a bubble surfactometer was impaired in rats with aspiration injury at 6, 24, and 48 h, with the largest activity reductions found in animals given CASP. There were strong statistical correlations between surfactant dysfunction (increased minimum surface tension and reduced large aggregate content) and the severity of lung injury based on arterial oxygenation and levels of albumin, protein, and erythrocytes in BAL (P < 0.0001). Surfactant dysfunction also correlated strongly with reduced lung volumes during inflation and deflation (P = 0.0004-0.005). These results indicate that surfactant abnormalities are functionally important in gastric aspiration lung injury and contribute significantly to the increased severity of injury found in CASP compared with ACID or SNAP alone.
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Affiliation(s)
- Bruce A Davidson
- Departments of Anesthesiology,University at Buffalo-State University of New York, Buffalo, NY 14214, USA
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Raghavendran K, Davidson BA, Mullan BA, Hutson AD, Russo TA, Manderscheid PA, Woytash JA, Holm BA, Notter RH, Knight PR. Acid and particulate-induced aspiration lung injury in mice: importance of MCP-1. Am J Physiol Lung Cell Mol Physiol 2005; 289:L134-43. [PMID: 15778247 DOI: 10.1152/ajplung.00390.2004] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A model of aspiration lung injury was developed in WT C57BL/6 mice to exploit genetically modified animals on this background, i.e., MCP-1(-/-) mice. Mice were given intratracheal hydrochloric acid (ACID, pH 1.25), small nonacidified gastric particles (SNAP), or combined acid plus small gastric particles (CASP). As reported previously in rats, lung injury in WT mice was most severe for "two-hit" aspiration from CASP (40 mg/ml particulates) based on the levels of albumin, leukocytes, TNF-alpha, IL-1beta, IL-6, MCP-1, KC, and MIP-2 in bronchoalveolar lavage (BAL) at 5, 24, and 48 h. MCP-1(-/-) mice given 40 mg/ml CASP had significantly decreased survival compared with WT mice (32% vs. 80% survival at 24 h and 0% vs. 72% survival at 48 h). MCP-1(-/-) mice also had decreased survival compared with WT mice for CASP aspirates containing reduced particulate doses of 10-20 mg/ml. MCP-1(-/-) mice given 5 mg/ml CASP had survival similar to WT mice given 40 mg/ml CASP. MCP-1(-/-) mice also had differing responses from WT mice for several inflammatory mediators in BAL (KC or IL-6 depending on the particle dose of CASP and time of injury). Histopathology of WT mice with CASP (40 mg particles/ml) showed microscopic areas of compartmentalization with prominent granuloma formation by 24 h, whereas lung tissue from MCP-1(-/-) mice had severe diffuse pneumonia without granulomas. These results indicate that MCP-1 is important for survival in murine aspiration pneumonitis and appears to act partly to protect uninjured lung regions by promoting isolation and compartmentalization of tissue with active inflammation.
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Affiliation(s)
- Krishnan Raghavendran
- Department of Surgery, University at Buffalo State University of New York, 14214, USA
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Knight PR, Davidson BA, Nader ND, Helinski JD, Marschke CJ, Russo TA, Hutson AD, Notter RH, Holm BA. Progressive, severe lung injury secondary to the interaction of insults in gastric aspiration. Exp Lung Res 2005; 30:535-57. [PMID: 15371091 DOI: 10.1080/01902140490489162] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
This study examines lung injury and inflammation over 24 hours following intratracheal instillation of hydrochloric acid (acid), small nonacidic gastric particles (SNAP), or combined acid and small particles (CASP) in adult rats. The severity and duration of injury was significantly greater for CASP compared to acid or SNAP based on PaO2/FiO2, bronchoalveolar lavage (BAL) albumin, and BAL cell numbers. The inflammatory response associated with aspiration injury from CASP was distinct in several respects. Tumor necrosis factor (TNF)-alpha was greatly reduced in CASP compared to SNAP or acid, whereas interleukin (IL)-1beta was increased. Levels of cytokine-induced neutrophil chemoattractant (CINC)-1, monocyte chemoattractant protein (MCP)-1, and IL-10 in lavage were also significantly increased in animals injured with CASP compared to other forms of aspiration. Statistical analysis showed that BAL levels of IL-10 correlated most strongly with albumin leakage in aspiration-injured animals at 6 and 24 hours, followed by BAL levels of MCP-1. Additional cytokine cluster analyses indicated that levels of MCP-1 and CINC-1 in BAL from all injured animals were strongly correlated with inflammatory neutrophil numbers at 6 and 24 hours post aspiration, and that IL-10 levels in BAL were strongly correlated with inflammatory cell numbers at 24 hours. Preliminary blocking experiments showed that administration of anti-IL-10 antibody increased the albumin permeability index at 6 hours in SNAP and CASP animals, but anti-MCP-1 antibody did not affect the severity of injury. The results of this study support the possibility that different forms of aspiration are associated with identifiable cytokine profiles, and that specific cytokines, including IL-10 and MCP-1, may have utility as diagnostic or prognostic markers in clinical applications.
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Affiliation(s)
- Paul R Knight
- Departments of Anesthesiology and Microbiology, State University of New York (SUNY) at Buffalo, Buffalo, New York 14214, USA.
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Fernandez SF, Huang MH, Davidson BA, Knight PR, Izzo JL. Mechanisms of Angiotensin II–Mediated Decreases in Intraneuronal Ca
2+
in Calcium-Loaded Stellate Ganglion Neurons. Hypertension 2005; 45:276-82. [PMID: 15642775 DOI: 10.1161/01.hyp.0000153320.13842.43] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Our laboratory has reported previously that angiotensin II, type-1 (AT
1
) receptor stimulation in isolated stellate ganglion neurons decreases intraneuronal calcium concentration ([Ca
2+
]i) acutely if baseline [Ca
2+
]i is high and increases [Ca
2+
]i if baseline [Ca
2+
]i is low. Part of the angiotensin II (Ang II) effect in high Ca
2+
neurons is mediated through stimulation of Na
+
–Ca
2+
exchange. Current experiments were conducted to identify additional steps in the signaling pathways. In Ca
2+
-loaded neurons, Ang II–induced decreases in [Ca
2+
]i were attenuated by phospholipase C inhibition (U73122) or nitric oxide (NO) synthase inhibition (
l
-NMMA) and were mimicked by the cGMP analogue 8-Br-cGMP. Protein kinase C (PKC) inhibition (bisindolylmaleimide I or Go6976) and protein kinase G (PKG) inhibition (KT5823) partially blocked Ang II–mediated decreases in [Ca
2+
]i, but complete blockade of Ang II effects was obtained with combined PKC and PKG inhibition. Modulation of inositol triphosphate (IP
3
)-inducible ER Ca
2+
release by [Ca
2+
]i was investigated using furaptra, an ER-retaining dye. IP
3
-mediated ER Ca
2+
release in β-escin–permeabilized neurons was measured after clamping of [Ca
2+
]i from 50 nM to 800 nM. Maximal ER Ca
2+
release was observed at ≈200 nM [Ca
2+
]i, with noted blunting of release at higher [Ca
2+
]i. Steady-state mRNA transcript and protein levels revealed that the principal IP
3
R isoform expressed was IP
3
R-II. These results suggest that Ca
2+
loading in stellate ganglion neurons promotes Ang II-mediated decreases in [Ca
2+
]i via PKC and NO/cGMP/PKG pathways and inhibits IP
3
R-II–mediated ER Ca
2+
release.
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Affiliation(s)
- Stanley F Fernandez
- Department of Pharmacology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, USA
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47
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Manderscheid PA, Bodkin RP, Davidson BA, Jensen E, Russo TA, Knight PR. Bacterial clearance and cytokine profiles in a murine model of postsurgical nosocomial pneumonia. Clin Diagn Lab Immunol 2005; 11:742-51. [PMID: 15242950 PMCID: PMC440598 DOI: 10.1128/cdli.11.4.742-751.2004] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The development of a nosocomial pneumonia is facilitated by alterations in host innate pulmonary antibacterial defenses following surgical trauma, which can result in decreased pulmonary bacterial clearance and increased morbidity and mortality. In a murine model of postoperative nosocomial infection, surgical stress (laparotomy) decreased Escherichia coli clearance from the lungs of animals that underwent surgery. Consistent with previous studies, (i) pulmonary levels of tumor necrosis factor alpha at 6 h and of interleukin-1beta (IL-1beta), IL-6, and gamma interferon (IFN-gamma) at 24 h post-bacterial infection (PBI) were decreased in animals that underwent laparotomy 24 h prior to E. coli infection (LAP/E. coli) compared to animals that received E. coli only; (ii) KC and macrophage inhibitory protein 2 were elevated at 6 h PBI in LAP/E. coli animals compared to E. coli-only animals; however, at 24 h PBI, levels were higher in the E. coli-only group; (iii) at 24 h PBI, monocyte chemoattractant protein 1 was lower in the LAP/E. coli group compared to the E. coli-only group; (iv) IL-10 levels were unaffected at all time points evaluated; and (v) the total number of neutrophils present in the lungs of LAP/E. coli animals at 6 h PBI was decreased in comparison to that in E. coli-only animals, resulting in decreased bacterial clearance and increased mortality in LAP/E. coli animals by 24 h PBI. Similar changes in cytokine profiles, pulmonary bacterial clearance, and mortality were consistent with reported findings in patients following surgical trauma. This model, therefore, provides a clinically relevant system in which the molecular and cellular mechanisms that lead to the development of nosocomial pneumonia can be further explored.
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48
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Davidson BA, Ramazashvili R, Kos S, Eckstein JN. Broken particle-hole symmetry at atomically flat a-axis YBa2Cu3O7-delta interfaces. Phys Rev Lett 2004; 93:107004. [PMID: 15447441 DOI: 10.1103/physrevlett.93.107004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2003] [Indexed: 05/24/2023]
Abstract
We have studied quasiparticle tunneling into atomically flat a-axis films of YBa(2)Cu(3)O(7-delta) and DyBa(2)Cu(3)O(7-delta) through epitaxial CaTiO3 barriers. The junction heterostructures were grown by oxide molecular beam epitaxy and were carefully optimized using in situ monitoring techniques, resulting in unprecedented crystalline perfection of the superconductor-insulator interface. Below T(c), the tunneling conductance shows the evolution of a large unexpected asymmetrical feature near zero-bias. This is evidence that superconducting YBCO crystals, atomically truncated along the lobe direction with a titanate layer, have intrinsically broken particle-hole symmetry over macroscopically large areas.
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Affiliation(s)
- Bruce A Davidson
- Physics Department, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
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49
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Abstract
OBJECTIVE To establish a model of secondary bacterial pneumonia following gastric aspiration and to identify possible mechanisms involved in the suppressed antibacterial defenses following the initial pulmonary insult. DESIGN A controlled, in vivo laboratory study. SETTING Research laboratory of a health sciences university. SUBJECTS Ninety-five Long-Evans rats. INTERVENTIONS Animals were anesthetized for neck dissection and placement of a 14-gauge catheter in the trachea. Gastric aspirate (1.2 mL/kg of saline, pH 1.25, and 40 mg/mL sterile rat gastric particles) or an equal amount of normal saline (pH 5.3) was instilled intratracheally. One minute after this insult, animals received an intratracheal instillation of either 5.6 x 10 colony-forming units of Escherichia coli or an equal volume of normal saline. The animals remained in room air until kill at 4 hrs or 24 hrs after the intratracheal instillation. The lungs were homogenized for quantitative bacterial cultures. Bronchoalveolar lavage fluid was obtained for cell counts and measurements of albumin, tumor necrosis factor-alpha, interleukin-1 beta, cytokine-induced neutrophil chemoattractant-1, macrophage inflammatory protein-2, monocyte chemoattractant protein-1, and interleukin 10. MEASUREMENTS AND MAIN RESULTS Animals that received gastric aspirate (followed by normal saline or E. coli) had increased injury as assessed by significant reductions in oxygenation and elevations in bronchoalveolar lavage albumin. At 24 hrs, animals that received gastric aspirate inoculation followed by E. coli had significantly higher pulmonary bacterial counts compared with animals that received E. coli alone. Gastric aspiration injury followed by bacterial inoculation also resulted in acute, but transient, increases in tumor necrosis factor-alpha, interleukin-1 beta, cytokine-induced neutrophil chemoattractant-1, and macrophage inflammatory protein-2 and more sustained elevations of monocyte chemoattractant protein-1 and interleukin-10. CONCLUSIONS Lung injury increases and bacterial clearance decreases in this experimental model of E. coli pneumonia following gastric aspiration. Cytokine profiles suggest possible mechanisms for the impaired antibacterial host defense.
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Affiliation(s)
- Alexandre T Rotta
- Pediatric Critical Care, The Children's Hospital of Buffalo and State University of New York (SUNY) at Buffalo School of Medicine, Buffalo, NY, USA.
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50
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Russo TA, Davidson BA, Carlino-MacDonald UB, Helinski JD, Priore RL, Knight PR. The effects of Escherichia coli capsule, O-antigen, host neutrophils, and complement in a rat model of Gram-negative pneumonia. FEMS Microbiol Lett 2003; 226:355-61. [PMID: 14553933 DOI: 10.1016/s0378-1097(03)00636-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Gram-negative enteric bacilli are agents of life-threatening pneumonia. The role of the bacterial capsule and O-antigen moiety of lipopolysaccharide in the pathogenesis of Gram-negative pneumonia was assessed. In a rat model of pneumonia the LD(50) of a wild-type extraintestinal pathogenic Escherichia coli strain (CP9) was significantly less than its isogenic derivatives deficient in capsule (CP9.137), O-antigen (CP921) or both capsule and O-antigen (CP923) (P< or =0.003). Studies using complement depleted or neutropenic animals established that both neutrophils and complement are important for the pulmonary clearance of E. coli. Data from these studies also support that capsule and O-antigen serve, at least in part, to counter the complement and neutrophil components of the pulmonary host defense response. Lastly, the contribution of E. coli versus neutrophils in causing lung injury was examined. Findings suggest that E. coli virulence factors and/or non-neutrophil host factors are more important mediators of lung injury than neutrophils. These findings extend our understanding of Gram-negative pneumonia and have treatment implications.
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Affiliation(s)
- Thomas A Russo
- Department of Medicine, Division of Infectious Diseases, 3435 Main St., Biomedical Research Building, Room 141, Buffalo, NY 14214, USA.
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