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Khadangi F, Tremblay-Pitre S, Dufour-Mailhot A, Rojas-Ruiz AB, Boucher M, Henry C, Fereydoonzad L, Brunet D, Robichaud A, Bossé Y. Sensitive physiological readouts to evaluate countermeasures for lipopolysaccharide-induced lung alterations in mice. Am J Physiol Lung Cell Mol Physiol 2022; 323:L107-L120. [PMID: 35670484 DOI: 10.1152/ajplung.00073.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Despite decades of research, studies investigating the physiological alterations caused by an acute bout of inflammation induced by exposing the lung to lipopolysaccharide have yielded inconsistent results. This can be attributed to small effects and/or a lack of fitted physiological testing. Herein, a comprehensive investigation of lung mechanics was conducted in 270 male C57BL/6 mice at 24, 48 or 96 h after an intranasal exposure to saline or lipopolysaccharide at either 1 or 3 mg/kg (30 mice per group). Traditional techniques that probe the lung using small-amplitude perturbations (i.e., oscillometry) were used, together with less conventional and new techniques that probe the lung using maneuvers of large amplitudes. The latter include a partial and a full-range pressure-volume maneuvers to measure quasi-static elastance, compliance, total lung volume, vital capacity and residual volume. The results demonstrate that lung mechanics assessed by oscillometry was only slightly affected by lipopolysaccharide, confirming previous findings. In contradistinction, lipopolysaccharide markedly altered mechanics when the lung was probed with maneuvers of large amplitudes. With the dose of 3 mg/kg at the peak of inflammation (48 h post-exposure), lipopolysaccharide increased quasi-static elastance by 26.7% (p<0.0001), and decreased compliance by 34.5% (p<0.0001). It also decreased lung volumes, including total lung capacity, vital capacity and residual volume by 33.3%, 30.5% and 43.3%, respectively (all p<0.0001). These newly reported physiological alterations represent sensitive outcomes to efficiently evaluate countermeasures (e.g., drugs) in the context of several lung diseases.
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Affiliation(s)
- Fatemeh Khadangi
- Institut Universitaire de Cardiologie et de Pneumologie de Quebec, Université Laval, Québec, Canada
| | - Sophie Tremblay-Pitre
- Institut Universitaire de Cardiologie et de Pneumologie de Quebec, Université Laval, Québec, Canada
| | - Alexis Dufour-Mailhot
- Institut Universitaire de Cardiologie et de Pneumologie de Quebec, Université Laval, Québec, Canada
| | - Andrés Bruno Rojas-Ruiz
- Institut Universitaire de Cardiologie et de Pneumologie de Quebec, Université Laval, Québec, Canada
| | - Magali Boucher
- Institut Universitaire de Cardiologie et de Pneumologie de Quebec, Université Laval, Québec, Canada
| | - Cyndi Henry
- Institut Universitaire de Cardiologie et de Pneumologie de Quebec, Université Laval, Québec, Canada
| | | | - David Brunet
- SCIREQ - Scientific Respiratory Equipment Inc., Montreal, Canada
| | | | - Ynuk Bossé
- Institut Universitaire de Cardiologie et de Pneumologie de Quebec, Université Laval, Québec, Canada
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2
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Robichaud A, Fereydoonzad L, Collins SL, Loube JM, Ishii Y, Horton MR, Martin JG, Mitzner W. Airway compliance measurements in mouse models of respiratory diseases. Am J Physiol Lung Cell Mol Physiol 2021; 321:L204-L212. [PMID: 34009049 DOI: 10.1152/ajplung.00470.2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The quantification of airway compliance (Caw) is essential to the study of airway alterations in disease models. However, the required measurements of airway pressure and volume are difficult to acquire in mice. We hypothesized that the inflation limb of full-range pressure-volume (PV) curves could be used to quantify Caw, as it contains a segment where only the airway tree is distended. The study objective was to assess the feasibility of the approach by analysis of full-range PV curves previously collected in three mouse models: an elastase model of emphysema, a genetic model spontaneously developing emphysema (leukotriene C4 synthase knockout; LTC4S-KO), and a bleomycin model of lung fibrosis. Attempts to validate results included Caw change relative to respiratory system compliance (ΔCaw/ΔC), the minute work of breathing (mWOB), and the elastance at 20.5 Hz (Ers_20.5) from prior respiratory mechanics measurements in the same subjects. Caw was estimated at 3% of total compliance in healthy mice or 2.3 ± 1 μL/cmH2O (n = 17). The technique detected changes in models of respiratory obstructive and restrictive diseases relative to control mice as well as differences in the two emphysema models studied. The changes in Caw were consistent with those seen in ΔCaw/ΔC, mWOB, or Ers_20.5, with some variations according to the model, as well as with results reported in the literature in humans and mice. Direct Caw measurements in subjects as small as mice could prove useful to further characterize other respiratory disease models associated with airway remodeling or to assess treatment effects.
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Affiliation(s)
| | | | - Samuel L Collins
- Johns Hopkins University School of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - Jeffrey Martin Loube
- Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland
| | - Yumiko Ishii
- Meakins-Christie Laboratories, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - Maureen R Horton
- Johns Hopkins University School of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - James G Martin
- Meakins-Christie Laboratories, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - Wayne Mitzner
- Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland
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3
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Yen S, Preissner M, Bennett E, Dubsky S, Carnibella R, Murrie R, Fouras A, Dargaville PA, Zosky GR. Interaction between regional lung volumes and ventilator-induced lung injury in the normal and endotoxemic lung. Am J Physiol Lung Cell Mol Physiol 2020; 318:L494-L499. [PMID: 31940217 DOI: 10.1152/ajplung.00492.2019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Both overdistension and atelectasis contribute to lung injury and mortality during mechanical ventilation. It has been proposed that combinations of tidal volume and end-expiratory lung volume exist that minimize lung injury linked to mechanical ventilation. The aim of this study was to examine this at the regional level in the healthy and endotoxemic lung. Adult female BALB/c mice were injected intraperitoneally with 10 mg/kg lipopolysaccharide (LPS) in saline or with saline alone. Four hours later, mice were mechanically ventilated for 2 h. Regional specific end-expiratory volume (sEEV) and tidal volume (sVt) were measured at baseline and after 2 h of ventilation using dynamic high-resolution four-dimensional computed tomography images. The regional expression of inflammatory genes was quantified by quantitative PCR. There was a heterogenous response in regional sEEV whereby endotoxemia increased gas trapping at end-expiration in some lung regions. Within the healthy group, there was a relationship between sEEV, sVt, and the expression of Tnfa, where high Vt in combination with high EEV or very low EEV was associated with an increase in gene expression. In endotoxemia there was an association between low sEEV, particularly when this was combined with moderate sVt, and high expression of IL6. Our data suggest that preexisting systemic inflammation modifies the relationship between regional lung volumes and inflammation and that although optimum EEV-Vt combinations to minimize injury exist, further studies are required to identify the critical inflammatory mediators to assess and the effect of different injury types on the response.
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Affiliation(s)
- Seiha Yen
- School of Medicine, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia
| | - Melissa Preissner
- Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Victoria, Australia
| | - Ellen Bennett
- School of Medicine, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia
| | - Stephen Dubsky
- Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Victoria, Australia
| | | | - Rhiannon Murrie
- Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Victoria, Australia
| | | | - Peter A Dargaville
- Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia
| | - Graeme R Zosky
- School of Medicine, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia.,Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia
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4
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Yen S, Preissner M, Bennett E, Dubsky S, Carnibella R, O'Toole R, Roddam L, Jones H, Dargaville PA, Fouras A, Zosky GR. The Link between Regional Tidal Stretch and Lung Injury during Mechanical Ventilation. Am J Respir Cell Mol Biol 2019; 60:569-577. [PMID: 30428271 DOI: 10.1165/rcmb.2018-0143oc] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The aim of this study was to assess the association between regional tidal volume (Vt), regional functional residual capacity (FRC), and the expression of genes linked with ventilator-induced lung injury. Two groups of BALB/c mice (n = 8 per group) were ventilated for 2 hours using a protective or injurious ventilation strategy, with free-breathing mice used as control animals. Regional Vt and FRC of the ventilated mice was determined by analysis of high-resolution four-dimensional computed tomographic images taken at baseline and after 2 hours of ventilation and corrected for the volume of the region (i.e., specific [s]Vt and specific [s]FRC). RNA concentrations of 21 genes in 10 different lung regions were quantified using a quantitative PCR array. sFRC at baseline varied regionally, independent of ventilation strategy, whereas sVt varied regionally depending on ventilation strategy. The expression of IL-6 (P = 0.04), Ccl2 (P < 0.01), and Ang-2 (P < 0.05) was associated with sVt but not sFRC. The expression of seven other genes varied regionally (IL-1β and RAGE [receptor for advanced glycation end products]) or depended on ventilation strategy (Nfe2l2 [nuclear factor erythroid-derived 2 factor 2], c-fos, and Wnt1) or both (TNF-α and Cxcl2), but it was not associated with regional sFRC or sVt. These observations suggest that regional inflammatory responses to mechanical ventilation are driven primarily by tidal stretch.
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Affiliation(s)
| | - Melissa Preissner
- 2 Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Victoria, Australia
| | | | - Stephen Dubsky
- 2 Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Victoria, Australia
| | | | | | | | - Heather Jones
- 4 Biomedical Imaging Research Institute.,5 Department of Medicine, and.,6 Women's Guild Lung Institute, Cedars-Sinai Medical Center, Los Angeles, California
| | - Peter A Dargaville
- 7 Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia
| | | | - Graeme R Zosky
- 1 School of Medicine and.,7 Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia
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5
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Gradl R, Dierolf M, Yang L, Hehn L, Günther B, Möller W, Kutschke D, Stoeger T, Gleich B, Achterhold K, Donnelley M, Pfeiffer F, Schmid O, Morgan KS. Visualizing treatment delivery and deposition in mouse lungs using in vivo x-ray imaging. J Control Release 2019; 307:282-291. [DOI: 10.1016/j.jconrel.2019.06.035] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 06/18/2019] [Accepted: 06/25/2019] [Indexed: 01/17/2023]
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6
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Preissner M, Murrie RP, Bresee C, Carnibella RP, Fouras A, Weir EK, Dubsky S, Pinar IP, Jones HD. Application of a novel in vivo imaging approach to measure pulmonary vascular responses in mice. Physiol Rep 2018; 6:e13875. [PMID: 30284390 PMCID: PMC6170880 DOI: 10.14814/phy2.13875] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 08/24/2018] [Indexed: 12/19/2022] Open
Abstract
Noninvasive imaging of the murine pulmonary vasculature is challenging due to the small size of the animal, limits of resolution of the imaging technology, terminal nature of the procedure, or the need for intravenous contrast. We report the application of laboratory-based high-speed, high-resolution x-ray imaging, and image analysis to detect quantitative changes in the pulmonary vascular tree over time in the same animal without the need for intravenous contrast. Using this approach, we detected an increased number of vessels in the pulmonary vascular tree of animals after 30 min of recovery from a brief exposure to inspired gas with 10% oxygen plus 5% carbon dioxide (mean ± standard deviation: 2193 ± 382 at baseline vs. 6177 ± 1171 at 30 min of recovery; P < 0.0001). In a separate set of animals, we showed that the total pulmonary blood volume increased (P = 0.0412) while median vascular diameter decreased from 0.20 mm (IQR: 0.15-0.28 mm) to 0.18 mm (IQR: 0.14-0.26 mm; P = 0.0436) over the respiratory cycle from end-expiration to end-inspiration. These findings suggest that the noninvasive, nonintravenous contrast imaging approach reported here can detect dynamic responses of the murine pulmonary vasculature and may be a useful tool in studying these responses in models of disease.
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Affiliation(s)
- Melissa Preissner
- Department of Mechanical and Aerospace EngineeringMonash UniversityMelbourneVictoriaAustralia
| | - Rhiannon P. Murrie
- Department of Mechanical and Aerospace EngineeringMonash UniversityMelbourneVictoriaAustralia
| | - Catherine Bresee
- Cedars‐Sinai Medical CenterBiostatistics & Bioinformatics Research InstituteLos AngelesCalifornia
| | | | - Andreas Fouras
- Department of Mechanical and Aerospace EngineeringMonash UniversityMelbourneVictoriaAustralia
- 4Dx LimitedMelbourneVictoriaAustralia
- Department of Biomedical SciencesCedars‐Sinai Medical CenterBiomedical Imaging Research InstituteLos AngelesCalifornia
| | - E. Kenneth Weir
- Department of MedicineUniversity of MinnesotaMinneapolisMinnesota
| | - Stephen Dubsky
- Department of Mechanical and Aerospace EngineeringMonash UniversityMelbourneVictoriaAustralia
| | - Isaac P. Pinar
- Department of Mechanical and Aerospace EngineeringMonash UniversityMelbourneVictoriaAustralia
| | - Heather D. Jones
- Department of Biomedical SciencesCedars‐Sinai Medical CenterBiomedical Imaging Research InstituteLos AngelesCalifornia
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Preissner M, Murrie RP, Pinar I, Werdiger F, Carnibella RP, Zosky GR, Fouras A, Dubsky S. High resolution propagation-based imaging system for in vivo dynamic computed tomography of lungs in small animals. ACTA ACUST UNITED AC 2018; 63:08NT03. [DOI: 10.1088/1361-6560/aab8d2] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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8
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Pinar IP, Jones HD. Novel imaging approaches for small animal models of lung disease (2017 Grover Conference series). Pulm Circ 2018; 8:2045894018762242. [PMID: 29480066 PMCID: PMC5888832 DOI: 10.1177/2045894018762242] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Imaging in small animal models of lung disease is challenging, as existing technologies are limited either by resolution or by the terminal nature of the imaging approach. Here, we describe the current state of small animal lung imaging, the technological advances of laboratory-sourced phase contrast X-ray imaging, and the application of this novel technology and its attendant image analysis techniques to the in vivo imaging of the large airways and pulmonary vasculature in murine models of lung health and disease.
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Affiliation(s)
- Isaac P Pinar
- 1 Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC, Australia.,2 Division of Biological Engineering, Faculty of Engineering, Monash University, Melbourne, VIC, Australia
| | - Heather D Jones
- 3 Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA
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