1
|
Tong S, Scott JC, Eyoh E, Werthmann DW, Stone AE, Murrell AE, Sabino-Santos G, Trinh IV, Chandra S, Elliott DH, Smira AR, Velazquez JV, Schieffelin J, Ning B, Hu T, Kolls JK, Landry SJ, Zwezdaryk KJ, Robinson JE, Gunn BM, Rabito FA, Norton EB. Altered COVID-19 immunity in children with asthma by atopic status. J Allergy Clin Immunol Glob 2024; 3:100236. [PMID: 38590754 PMCID: PMC11000189 DOI: 10.1016/j.jacig.2024.100236] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 12/13/2023] [Accepted: 01/03/2024] [Indexed: 04/10/2024]
Abstract
Background Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection causes a spectrum of clinical outcomes that may be complicated by severe asthma. Antiviral immunity is often compromised in patients with asthma; however, whether this is true for SARS-CoV-2 immunity and children is unknown. Objective We aimed to evaluate SARS-CoV-2 immunity in children with asthma on the basis of infection or vaccination history and compared to respiratory syncytial viral or allergen (eg, cockroach, dust mite)-specific immunity. Methods Fifty-three children from an urban asthma study were evaluated for medical history, lung function, and virus- or allergen-specific immunity using antibody or T-cell assays. Results Polyclonal antibody responses to spike were observed in most children from infection and/or vaccination history. Children with atopic asthma or high allergen-specific IgE, particularly to dust mites, exhibited reduced seroconversion, antibody magnitude, and SARS-CoV-2 virus neutralization after SARS-CoV-2 infection or vaccination. TH1 responses to SARS-CoV-2 and respiratory syncytial virus correlated with antigen-respective IgG. Cockroach-specific T-cell activation as well as IL-17A and IL-21 cytokines negatively correlated with SARS-CoV-2 antibodies and effector functions, distinct from total and dust mite IgE. Allergen-specific IgE and lack of vaccination were associated with recent health care utilization. Reduced lung function (forced expiratory volume in 1 second ≤ 80%) was independently associated with (SARS-CoV-2) peptide-induced cytokines, including IL-31, whereas poor asthma control was associated with cockroach-specific cytokine responses. Conclusion Mechanisms underpinning atopic and nonatopic asthma may complicate the development of memory to SARS-CoV-2 infection or vaccination and lead to a higher risk of repeated infection in these children.
Collapse
Affiliation(s)
- Sherry Tong
- Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, La
| | - Jordan C. Scott
- Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, La
| | - Enwono Eyoh
- Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, La
| | - Derek W. Werthmann
- Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, La
| | - Addison E. Stone
- Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, La
| | - Amelie E. Murrell
- Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, La
| | - Gilberto Sabino-Santos
- Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, La
| | - Ivy V. Trinh
- Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, La
| | - Sruti Chandra
- Department of Pediatrics, Tulane University School of Medicine, New Orleans, La
| | - Debra H. Elliott
- Department of Pediatrics, Tulane University School of Medicine, New Orleans, La
| | - Ashley R. Smira
- Department of Pediatrics, Tulane University School of Medicine, New Orleans, La
| | - Jalene V. Velazquez
- Paul G. Allen School of Global Health, Washington State University, Pullman, Wash
| | - John Schieffelin
- Department of Pediatrics, Tulane University School of Medicine, New Orleans, La
| | - Bo Ning
- Center for Cellular and Molecular Diagnostics, Tulane University School of Medicine, New Orleans, La
- Department of Biochemistry & Molecular Biology, Tulane University School of Medicine, New Orleans, La
| | - Tony Hu
- Center for Cellular and Molecular Diagnostics, Tulane University School of Medicine, New Orleans, La
- Department of Biochemistry & Molecular Biology, Tulane University School of Medicine, New Orleans, La
| | - Jay K. Kolls
- Department of Medicine, Tulane University School of Medicine, New Orleans, La
| | - Samuel J. Landry
- Department of Biochemistry & Molecular Biology, Tulane University School of Medicine, New Orleans, La
| | - Kevin J. Zwezdaryk
- Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, La
| | - James E. Robinson
- Department of Pediatrics, Tulane University School of Medicine, New Orleans, La
| | - Bronwyn M. Gunn
- Paul G. Allen School of Global Health, Washington State University, Pullman, Wash
| | - Felicia A. Rabito
- Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, La
| | - Elizabeth B. Norton
- Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, La
| |
Collapse
|
2
|
Ulu A, Sveiven S, Bilg A, Velazquez JV, Diaz M, Mukherjee M, Yuil-Valdes AG, Kota S, Burr A, Najera A, Nordgren TM. IL-22 regulates inflammatory responses to agricultural dust-induced airway inflammation. Toxicol Appl Pharmacol 2022; 446:116044. [PMID: 35525330 PMCID: PMC9133182 DOI: 10.1016/j.taap.2022.116044] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 04/21/2022] [Accepted: 04/28/2022] [Indexed: 11/26/2022]
Abstract
IL-22 is a unique cytokine that is upregulated in many chronic inflammatory diseases, including asthma, and modulates tissue responses during inflammation. However, the role of IL-22 in the resolution of inflammation and how this contributes to lung repair processes are largely unknown. Here, we tested the hypothesis that IL-22 signaling is critical in inflammation resolution after repetitive exposure to agricultural dust. Using an established mouse model of organic dust extract-induced lung inflammation, we found that IL-22 knockout mice have an enhanced response to agricultural dust as evidenced by an exacerbated increase in infiltrating immune cells and lung pathology as compared to wild-type controls. We further identified that, in response to dust, IL-22 is expressed in airway epithelium and in Ym1+ macrophages found within the parenchyma in response to dust. The increase in IL-22 expression was accompanied by increases in IL-22 receptor IL-22R1 within the lung epithelium. In addition, we found that alveolar macrophages in vivo as well as THP-1 cells in vitro express IL-22, and this expression is modulated by dust exposure. Furthermore, subcellular localization of IL-22 appears to be in the Golgi of resting THP1 human monocytes, and treatment with dust extracts is associated with IL-22 release into the cytosolic compartment from the Golgi reservoirs during dust extract exposure. Taken together, we have identified a significant role for macrophage-mediated IL-22 signaling that is activated in dust-induced lung inflammation in mice.
Collapse
Affiliation(s)
- Arzu Ulu
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA
| | - Stefanie Sveiven
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA
| | - Amanpreet Bilg
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA
| | - Jalene V Velazquez
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA
| | - Marissa Diaz
- Riverside Community College, Riverside, CA 92521, USA
| | - Maheswari Mukherjee
- Department of Medical Sciences, College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Ana G Yuil-Valdes
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Santosh Kota
- Department of Preprofessional Biology, University of Florida, Gainesville, FL 32603, USA
| | - Abigail Burr
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA
| | - Aileen Najera
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA
| | - Tara M Nordgren
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA; Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO, 80521, USA.
| |
Collapse
|
3
|
Velazquez JV, Bond NG, Schieffelin JS, Gunn BM. Distinct antibody profiles against Ebola virus track with the development of Post-Ebola Syndrome. The Journal of Immunology 2022. [DOI: 10.4049/jimmunol.208.supp.126.30] [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: 01/03/2023]
Abstract
Abstract
Survivors of Ebola virus disease (EVD) have reported a wide range of symptoms following recovery from infection. These long-term sequelae, collectively termed post-Ebola syndrome (PES), can significantly impact the daily lives of EVD survivors, yet little is known about the underlying mechanism of PES pathogenesis. Antibodies against Ebola virus provide protection against infection through both neutralization and recruitment of innate immune effector functions via the antibody Fc region, yet persistent antibody-mediated inflammation may contribute to PES manifestations. To investigate the potential role that virus-specific antibodies have in PES, we analyzed the antibody immune profiles in a cohort of EVD survivors and household contacts that had been previously characterized for clinical sequelae. Antibodies isolated from survivors an average of 2.5 years after recovery were measured for induction of Fc-mediated innate effector function against the immunodominant antigen Ebola glycoprotein-coated targets. We found that antibodies in asymptomatic EVD survivors were qualitatively different from survivors experiencing musculoskeletal and gastrointestinal manifestations of PES. Specifically, antibodies from asymptomatic individuals induced higher levels of antibody-dependent complement deposition and monocyte-mediated phagocytosis, but not neutrophil-mediated phagocytosis, and differed in NK cell activation profiles compared with individuals with PES. Together, these data suggest that the development of qualitatively different antibodies may shape susceptibility to/protection from the development of PES and may help identify potential therapeutic targets for EVD survivors suffering from PES.
Supported by Washington State University, College of Veterinary Medicine
Collapse
Affiliation(s)
| | | | | | - Bronwyn M Gunn
- 1Paul G. Allen School of Global Health, Washington State University
| |
Collapse
|
4
|
Eyoh E, Murrell A, Werthmann D, Trinh I, Stone A, Chandra S, Elliott D, Smira A, Velazquez JV, Schieffelin JS, Kolls JK, Robinson J, Gunn BM, Rabito F, Norton EB. T Cell Responses In Children With Asthma Against SARS-CoV-2 Correlates To Asthmatic Outcomes. The Journal of Immunology 2022. [DOI: 10.4049/jimmunol.208.supp.109.05] [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: 01/04/2023]
Abstract
Abstract
SARS CoV-2 in children or special populations post-infection has not been well studied. Asthma is a heterogenous disease marked by chronic airway inflammation; triggers include cockroaches (CRA), and other inhaled irritants. Asthma also has links to viral infections like respiratory syncytial virus (RSV). Additionally, some with moderate to severe asthma are more likely to be hospitalized with COVID. T cells play key roles in asthma and control of viruses such; however, there is limited information connecting T cell responses in people with asthma to viral infections. We aimed to evaluate T cells and antibodies in an asthma confirmed cohort. Thirty-five children aged 5–17 years were included. We measured SARS CoV-2 spike (S) and Nucleoprotein (N) plasma antibody responses or effector functions and CD4, CD8 T cells specific to CRA or peptide pools made from RSV, S and N antigen using an activation induced markers (AIM) assay. Surprisingly, in this population many CD4 and CD8 T-cell AIM responses to S, N, CRA, and RSV were significantly associated, particularly for CD8 T-cells (Spearmans r = 0.57–0.76) and the restimulation antigens CRA and RSV. N-specific CD4 AIM was the only immune measure to correlate to a recent asthma attack within a month of the blood collection visit, though anti-N antibodies, CD4 AIM to CRA, RSV or CD8 AIM to CRA, RSV, or N antigens also correlated with asthmatic outcomes (e.g., ER visits, night waking from symptoms, etc.) whereas allergen specific IgE or anti-S IgG did not. Taken together these results indicate an immunological association between viral infection and asthma, broadly allowing for the conjecture that viral infections, in particular RSV and SARS-CoV-2 could act together as possible triggers of asthma.
Collapse
Affiliation(s)
- Enwono Eyoh
- 1Immunology, Department of Microbiology & Immunology, Tulane University School of Medicine
| | - Amelie Murrell
- 2Department of Microbiology & Immunology, Tulane University School of Medicine
| | - Derek Werthmann
- 3Tulane University School of Public Health and Tropical Medicine
| | - Ivy Trinh
- 2Department of Microbiology & Immunology, Tulane University School of Medicine
| | - Addison Stone
- 2Department of Microbiology & Immunology, Tulane University School of Medicine
| | - Sruti Chandra
- 4Department of Pediatrics, Tulane University School of Medicine
| | - Debra Elliott
- 4Department of Pediatrics, Tulane University School of Medicine
| | - Ashley Smira
- 4Department of Pediatrics, Tulane University School of Medicine
| | | | | | - Jay K Kolls
- 7Department of Medicine, Tulane University School of Medicine
| | - James Robinson
- 4Department of Pediatrics, Tulane University School of Medicine
| | - Bronwyn M Gunn
- 5Paul G. Allen School of Global Health, Washington State University
| | - Felicia Rabito
- 3Tulane University School of Public Health and Tropical Medicine
| | - Elizabeth B Norton
- 2Department of Microbiology & Immunology, Tulane University School of Medicine
| |
Collapse
|
5
|
Ulu A, Velazquez JV, Burr A, Sveiven SN, Yang J, Bravo C, Hammock BD, Nordgren TM. Sex-Specific Differences in Resolution of Airway Inflammation in Fat-1 Transgenic Mice Following Repetitive Agricultural Dust Exposure. Front Pharmacol 2022; 12:785193. [PMID: 35095496 PMCID: PMC8793679 DOI: 10.3389/fphar.2021.785193] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 12/23/2021] [Indexed: 11/13/2022] Open
Abstract
In agriculture industries, workers are at increased risk for developing pulmonary diseases due to inhalation of agricultural dusts, particularly when working in enclosed confinement facilities. Agricultural dusts inhalation leads to unresolved airway inflammation that precedes the development and progression of lung disease. We have previously shown beneficial effects of the omega-3 polyunsaturated fatty acid (ω-3 PUFA) DHA in protecting against the negative inflammatory effects of repetitive dust exposure in the lung. Dietary manipulation of pulmonary disease risk is an attractive and timely approach given the contribution of an increased ω-6 to ω-3 PUFA ratio to low grade inflammation and chronic disease in the Western diet. To prevent any confounding factors that comes with dietary supplementation of ω-3 PUFA (different sources, purity, dose, and duration), we employed a Fat-1 transgenic mouse model that convert ω-6 PUFA to ω-3 PUFA, leading to a tissue ω-6 to ω-3 PUFA ratio of approximately 1:1. Building on our initial findings, we hypothesized that attaining elevated tissue levels of ω-3 PUFA would attenuate agricultural dust-induced lung inflammation and its resolution. To test this hypothesis, we compared wild-type (WT) and Fat-1 transgenic mice in their response to aqueous extracts of agricultural dust (DE). We also used a soluble epoxide hydrolase inhibitor (sEH) to potentiate the effects of ω-3 PUFA, since sEH inhibitors have been shown to stabilize the anti-inflammatory P450 metabolites derived from both ω-3 and ω-6 PUFA and promote generation of specialized pro-resolving lipid mediators from ω-3 PUFA. Over a three-week period, mice were exposed to a total of 15 intranasal instillations of DE obtained from swine confinement buildings in the Midwest. We observed genotype and sex-specific differences between the WT vs. Fat-1 transgenic mice in response to repetitive dust exposure, where three-way ANOVA revealed significant main effects of treatment, genotype, and sex. Also, Fat-1 transgenic mice displayed reduced lymphoid aggregates in the lung following DE exposure as compared to WT animals exposed to DE, suggesting improved resilience to the DE-induced inflammatory effects. Overall, our data implicate a protective role of ω-3 FA in the lung following repetitive dust exposure.
Collapse
Affiliation(s)
- Arzu Ulu
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA, United States
| | - Jalene V Velazquez
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA, United States
| | - Abigail Burr
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA, United States
| | - Stefanie N Sveiven
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA, United States
| | - Jun Yang
- Department of Entomology and Nematology, University of California Davis Comprehensive Cancer Center, University of California, Davis, Davis, CA, United States
| | - Carissa Bravo
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA, United States
| | - Bruce D Hammock
- Department of Entomology and Nematology, University of California Davis Comprehensive Cancer Center, University of California, Davis, Davis, CA, United States
| | - Tara M Nordgren
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA, United States.,Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO, United States
| |
Collapse
|
6
|
Burr AC, Velazquez JV, Ulu A, Kamath R, Kim SY, Bilg AK, Najera A, Sultan I, Botthoff JK, Aronson E, Nair MG, Nordgren TM. Lung Inflammatory Response to Environmental Dust Exposure in Mice Suggests a Link to Regional Respiratory Disease Risk. J Inflamm Res 2021; 14:4035-4052. [PMID: 34456580 PMCID: PMC8387588 DOI: 10.2147/jir.s320096] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 08/06/2021] [Indexed: 12/16/2022] Open
Abstract
PURPOSE The Salton Sea, California's largest lake, is designated as an agricultural drainage reservoir. In recent years, the lake has experienced shrinkage due to reduced water sources, increasing levels of aerosolized dusts in surrounding regions. Communities surrounding the Salton Sea have increased asthma prevalence versus the rest of California; however, a connection between dust inhalation and lung health impacts has not been defined. METHODS We used an established intranasal dust exposure murine model to study the lung inflammatory response following single or repetitive (7-day) exposure to extracts of dusts collected in regions surrounding the Salton Sea (SSDE), complemented with in vitro investigations assessing SSDE impacts on the airway epithelium. RESULTS In these investigations, single or repetitive SSDE exposure induced significant lung inflammatory cytokine release concomitant with neutrophil influx. Repetitive SSDE exposure led to significant lung eosinophil recruitment and altered expression of genes associated with allergen-mediated immune response, including Clec4e. SSDE treatment of human bronchial epithelial cells (BEAS-2B) induced inflammatory cytokine production at 5- and 24-hours post-treatment. When BEAS-2B were exposed to protease activity-depleted SSDE (PDSSDE) or treated with SSDE in the context of protease-activated receptor-1 and -2 antagonism, inflammatory cytokine release was decreased. Furthermore, repetitive exposure to PDSSDE led to decreased neutrophil and eosinophilic influx and IL-6 release in mice compared to SSDE-challenged mice. CONCLUSION These investigations demonstrate potent lung inflammatory responses and tissue remodeling in response to SSDE, in part due to environmental proteases found within the dusts. These studies provide the first evidence supporting a link between environmental dust exposure, protease-mediated immune activation, and respiratory disease in the Salton Sea region.
Collapse
Affiliation(s)
- Abigail C Burr
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| | - Jalene V Velazquez
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| | - Arzu Ulu
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| | - Rohan Kamath
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| | - Sang Yong Kim
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| | - Amanpreet K Bilg
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| | - Aileen Najera
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| | - Iman Sultan
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| | - Jon K Botthoff
- Center for Conservation Biology, University of California Riverside, Riverside, CA, 92521, USA
| | - Emma Aronson
- Department of Plant Pathology and Microbiology, University of California Riverside, Riverside, CA, 92521, USA
| | - Meera G Nair
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| | - Tara M Nordgren
- Division of Biomedical Sciences, University of California Riverside, Riverside, CA, 92521, USA
| |
Collapse
|
7
|
Baggio C, Velazquez JV, Fragai M, Nordgren TM, Pellecchia M. Therapeutic Targeting of MMP-12 for the Treatment of Chronic Obstructive Pulmonary Disease. J Med Chem 2020; 63:12911-12920. [PMID: 33107733 DOI: 10.1021/acs.jmedchem.0c01285] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chronic obstructive pulmonary disease (COPD) is a lung disorder characterized by progressive airflow obstruction associated with inflammation and emphysema, and it is currently one of the leading causes of death worldwide. Recent studies with genetically engineered mice reported that during pulmonary inflammation, basophil-derived interleukin-4 can act on lung-infiltrating monocytes causing aberrant expression of the matrix metalloproteinase-12 (MMP-12). MMP-12 activity in turn causes the destruction of alveolar walls leading to emphysema, making it potentially a valid target for pharmacological intervention. Using nuclear magnetic resonance (NMR)- and structure-based optimizations, the current study reports on the optimized novel, potent, and selective MMP-12 inhibitors with single-digit nanomolar affinity in vitro and in vivo efficacy. Using a murine model of elastase-induced emphysema we demonstrated that the most potent agents exhibited a significant decrease in emphysema-like pathology compared to vehicle-treated mice, thus suggesting that the reported agents may potentially be translated into novel therapeutics for the treatment of COPD.
Collapse
Affiliation(s)
- Carlo Baggio
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, 900 University Avenue, Riverside, California 92521, United States
| | - Jalene V Velazquez
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, 900 University Avenue, Riverside, California 92521, United States
| | - Marco Fragai
- Magnetic Resonance Center (CERM), University of Florence and Consorzio Interuniversitario Risonanze Magnetiche di Metallo Proteine (CIRMMP), Via L. Sacconi 6, 50019 Sesto Fiorentino, Italy
| | - Tara M Nordgren
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, 900 University Avenue, Riverside, California 92521, United States
| | - Maurizio Pellecchia
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, 900 University Avenue, Riverside, California 92521, United States
| |
Collapse
|
8
|
Sattari S, Mariano CA, Vittalbabu S, Velazquez JV, Postma J, Horst C, Teh E, Nordgren TM, Eskandari M. Introducing a Custom-Designed Volume-Pressure Machine for Novel Measurements of Whole Lung Organ Viscoelasticity and Direct Comparisons Between Positive- and Negative-Pressure Ventilation. Front Bioeng Biotechnol 2020; 8:578762. [PMID: 33195138 PMCID: PMC7643401 DOI: 10.3389/fbioe.2020.578762] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 09/17/2020] [Indexed: 12/13/2022] Open
Abstract
Asthma, emphysema, COVID-19 and other lung-impacting diseases cause the remodeling of tissue structural properties and can lead to changes in conducting pulmonary volume, viscoelasticity, and air flow distribution. Whole organ experimental inflation tests are commonly used to understand the impact of these modifications on lung mechanics. Here we introduce a novel, automated, custom-designed device for measuring the volume and pressure response of lungs, surpassing the capabilities of traditional machines and built to range size-scales to accommodate both murine and porcine tests. The software-controlled system is capable of constructing standardized continuous volume-pressure curves, while accounting for air compressibility, yielding consistent and reproducible measures while eliminating the need for pulmonary degassing. This device uses volume-control to enable viscoelastic whole lung macromechanical insights from rate dependencies and pressure-time curves. Moreover, the conceptual design of this device facilitates studies relating the phenomenon of diaphragm breathing and artificial ventilation induced by pushing air inside the lungs. System capabilities are demonstrated and validated via a comparative study between ex vivo murine lungs and elastic balloons, using various testing protocols. Volume-pressure curve comparisons with previous pressure-controlled systems yield good agreement, confirming accuracy. This work expands the capabilities of current lung experiments, improving scientific investigations of healthy and diseased pulmonary biomechanics. Ultimately, the methodologies demonstrated in the manufacturing of this system enable future studies centered on investigating viscoelasticity as a potential biomarker and improvements to patient ventilators based on direct assessment and comparisons of positive- and negative-pressure mechanics.
Collapse
Affiliation(s)
- Samaneh Sattari
- Department of Mechanical Engineering, University of California, Riverside, Riverside, CA, United States
| | - Crystal A Mariano
- Department of Mechanical Engineering, University of California, Riverside, Riverside, CA, United States
| | - Swathi Vittalbabu
- Department of Mechanical Engineering, University of California, Riverside, Riverside, CA, United States
| | - Jalene V Velazquez
- BREATHE Center at the School of Medicine, University of California, Riverside, Riverside, CA, United States.,Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA, United States
| | | | - Caleb Horst
- CellScale Biomaterials Testing, Waterloo, ON, Canada
| | - Eric Teh
- CellScale Biomaterials Testing, Waterloo, ON, Canada
| | - Tara M Nordgren
- BREATHE Center at the School of Medicine, University of California, Riverside, Riverside, CA, United States.,Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA, United States
| | - Mona Eskandari
- Department of Mechanical Engineering, University of California, Riverside, Riverside, CA, United States.,BREATHE Center at the School of Medicine, University of California, Riverside, Riverside, CA, United States.,Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
| |
Collapse
|