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Milad N, Fantauzzi MF, McGrath JJ, Cass SP, Thayaparan D, Wang P, Afkhami S, Aguiar JA, Ask K, Doxey AC, Stampfli MR, Hirota JA. Cannabis smoke suppresses antiviral immune responses to influenza A in mice. ERJ Open Res 2023; 9:00219-2023. [PMID: 38020563 PMCID: PMC10680033 DOI: 10.1183/23120541.00219-2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 07/31/2023] [Indexed: 12/01/2023] Open
Abstract
Rationale Despite its increasingly widespread use, little is known about the impact of cannabis smoking on the response to viral infections like influenza A virus (IAV). Many assume that cannabis smoking will disrupt antiviral responses in a manner similar to cigarette smoking; however, since cannabinoids exhibit anti-inflammatory effects, cannabis smoke exposure may impact viral infection in distinct ways. Methods Male and female BALB/c mice were exposed daily to cannabis smoke and concurrently intranasally instilled with IAV. Viral burden, inflammatory mediator levels (multiplex ELISA), lung immune cells populations (flow cytometry) and gene expression patterns (RNA sequencing) were assessed in the lungs. Plasma IAV-specific antibodies were measured via ELISA. Results We found that cannabis smoke exposure increased pulmonary viral burden while decreasing total leukocytes, including macrophages, monocytes and dendritic cell populations in the lungs. Furthermore, infection-induced upregulation of certain inflammatory mediators (interferon-γ and C-C motif chemokine ligand 5) was blunted by cannabis smoke exposure, which in females was linked to the transcriptional downregulation of pathways involved in innate and adaptive immune responses. Finally, plasma levels of IAV-specific IgM and IgG1 were significantly decreased in cannabis smoke-exposed, infected mice compared to infected controls, only in female mice. Conclusions Overall, cannabis smoke exposure disrupted host-defence processes, leading to increased viral burden and dampened inflammatory signalling. These results suggest that cannabis smoking is detrimental to the maintenance of pulmonary homeostasis during viral infection and highlight the need for data regarding the impact on immune competency in humans.
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Affiliation(s)
- Nadia Milad
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health – Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- These authors contributed equally to the studies and manuscript
| | - Matthew F. Fantauzzi
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health – Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- These authors contributed equally to the studies and manuscript
| | - Joshua J.C. McGrath
- Drukier Institute for Children's Health, Department of Pediatrics, Weill Cornell Medicine, New York, NY, USA
| | - Steven P. Cass
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health – Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
| | - Danya Thayaparan
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health – Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
| | - Peiyao Wang
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health – Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
| | - Sam Afkhami
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health – Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
| | | | - Kjetil Ask
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health – Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
| | - Andrew C. Doxey
- Department of Biology, University of Waterloo, Waterloo, ON, Canada
| | - Martin R. Stampfli
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health – Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
| | - Jeremy A. Hirota
- Department of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health – Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
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2
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Donen G, Milad N, Bernatchez P. Humanization of the mdx Mouse Phenotype for Duchenne Muscular Dystrophy Modeling: A Metabolic Perspective. J Neuromuscul Dis 2023; 10:1003-1012. [PMID: 37574742 PMCID: PMC10657711 DOI: 10.3233/jnd-230126] [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] [Accepted: 07/25/2023] [Indexed: 08/15/2023]
Abstract
Duchenne muscular dystrophy (DMD) is a severe form of muscular dystrophy (MD) that is characterized by early muscle wasting and lethal cardiorespiratory failure. While the mdx mouse is the most common model of DMD, it fails to replicate the severe loss of muscle mass and other complications observed in patients, in part due to the multiple rescue pathways found in mice. This led to several attempts at improving DMD animal models by interfering with these rescue pathways through double transgenic approaches, resulting in more severe phenotypes with mixed relevance to the human pathology. As a growing body of literature depicts DMD as a multi-system metabolic disease, improvements in mdx-based modeling of DMD may be achieved by modulating whole-body metabolism instead of muscle homeostasis. This review provides an overview of the established dual-transgenic approaches that exacerbate the mild mdx phenotype by primarily interfering with muscle homeostasis and highlights how advances in DMD modeling coincide with inducing whole-body metabolic changes. We focus on the DBA2/J strain-based D2.mdx mouse with heightened transforming growth factor (TGF)-β signaling and the dyslipidemic mdx/apolipoprotein E (mdx/ApoE) knock-out (KO) mouse, and summarize how these novel models emulate the metabolic changes observed in DMD.
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Affiliation(s)
| | | | - Pascal Bernatchez
- Correspondence to: Dr. Pascal Bernatchez, Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia, 2176 Health Sciences mall, room 217, Vancouver BC, V6T 1Z3, Canada. Tel.: +1 604 806 8346 /Ext.66060; E-mail:
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3
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Milad N, Pineault M, Tremblay F, Routhier J, Lechasseur A, Beaulieu MJ, Aubin S, Morissette MC. Smoking status impacts treatment efficacy in smoke-induced lung inflammation: A pre-clinical study. Front Pharmacol 2022; 13:971238. [PMID: 36160400 PMCID: PMC9490227 DOI: 10.3389/fphar.2022.971238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 08/15/2022] [Indexed: 11/26/2022] Open
Abstract
Rationale: Smoking status and smoking history remain poorly accounted for as variables that could affect the efficacy of new drugs being tested in chronic obstructive pulmonary disease (COPD) patients. As a proof of concept, we used a pre-clinical model of cigarette smoke (CS) exposure to compare the impact of treatment during active CS exposure or during the cessation period on the anti-inflammatory effects IL-1α signaling blockade. Methods: Mice were exposed to CS for 2 weeks, followed by a 1-week cessation, then acutely re-exposed for 2 days. Mice were treated with an anti-IL-1α antibody either during CS exposure or during cessation and inflammatory outcomes were assessed. Results: We found that mice re-exposed to CS displayed reduced neutrophil counts and cytokine levels in the bronchoalveolar lavage (BAL) compared to mice exposed only acutely. Moreover, we found that treatment with an anti-IL-1α antibody during the initial CS exposure delayed inflammatory processes and interfered with pulmonary adaptation, leading to rebound pulmonary neutrophilia, increased BAL cytokine secretion (CCL2) and upregulated Mmp12 expression. Conversely, administration of anti-IL-1α during cessation had the opposite effect, improving BAL neutrophilia, decreasing CCL2 levels and reducing Mmp12 expression. Discussion: These results suggest that pulmonary adaptation to CS exposure dampens inflammation and blocking IL-1α signaling during CS exposure delays the inflammatory response. More importantly, the same treatment administered during cessation hastens the return to pulmonary inflammatory homeostasis, strongly suggesting that smoking status and treatment timing should be considered when testing new biologics in COPD.
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Affiliation(s)
- Nadia Milad
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Faculty of Medicine, Université Laval, Quebec City, QC, Canada
| | - Marie Pineault
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Faculty of Medicine, Université Laval, Quebec City, QC, Canada
| | - Félix Tremblay
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Faculty of Medicine, Université Laval, Quebec City, QC, Canada
| | - Joanie Routhier
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
| | - Ariane Lechasseur
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
| | | | - Sophie Aubin
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
| | - Mathieu C. Morissette
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Department of Medicine, Université Laval, Quebec City, QC, Canada
- *Correspondence: Mathieu C. Morissette,
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4
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Nyberg A, Milad N, Martin M, Patoine D, Morissette MC, Saey D, Maltais F. Role of progression of training volume on intramuscular adaptations in patients with chronic obstructive pulmonary disease. Front Physiol 2022; 13:873465. [PMID: 36082219 PMCID: PMC9446145 DOI: 10.3389/fphys.2022.873465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 07/15/2022] [Indexed: 11/18/2022] Open
Abstract
Introduction: Quadriceps dysfunction is a common systemic manifestation of chronic obstructive pulmonary disease (COPD), for which treatment using resistance training is highly recommended. Even though training volume is suggested to be a key explanatory factor for intramuscular adaptation to resistance training in healthy older adults, knowledge is scarce on the role of progression of training volume for intramuscular adaptations in COPD. Methods: This study was a sub-analysis of a parallel-group randomized controlled trial. Thirteen patients with severe to very severe COPD (median 66 yrs, forced expiratory volume in 1 s 44% predicted) performed 8 weeks of low-load resistance training. In a post hoc analysis, they were divided into two groups according to their training volume progression. Those in whom training volume continued to increase after the first 4 weeks of training outlined the continued progression group (n = 9), while those with limited increase (<5%) or even reduction in training volume after the initial 4 weeks composed the discontinued progression group (n = 4). Fiber-type distribution and oxidative muscle protein levels, i.e., citrate synthase (CS), hydroxyacyl-coenzyme A dehydrogenase (HADH), mitochondrial transcription factor A (TfAM) as well as quadriceps endurance measures (total work from elastic band and isokinetic knee extension tests), were assessed before and after the intervention period. Results: The continued progression group sustained their training volume progression during weeks 5–8 compared to weeks 1–4 (median +25%), while the discontinued progression group did not (median -2%) (p = 0.007 between groups). Compared with baseline values, significant between-group differences in fiber type distribution and TfAM muscle protein levels (range ± 17–62%, p < 0.05) and in individual responses to change in Type I and Type IIa fiber type proportion, CS, HADH, and TfAM muscle protein levels outcomes (median 89 vs. 50%, p = 0.001) were seen in favor of the continued progression group. Moreover, only the continued progression group had a significant increase in HADH muscle protein levels (+24%, p = 0.004), elastic band (+56%, p = 0.004) and isokinetic (+7%, p = 0.004) quadriceps endurance, but the between-group differences did not reach statistical significance (range 14–29%, p = 0.330–1.000). Discussion: The novel findings of the current study were that patients with COPD who had a continued progression of training volume across the 8-weeks intervention had an increased proportion of Type I fibers, and TfAM muscle protein levels and decreased proportion of Type II fibers compared to those that did not continue to progress their training volume after the initial weeks. Additionally, HADH muscle protein levels and quadriceps endurance measurements only improved in the continued progression group, although no significant between-group differences were seen. These findings highlight the importance of continued progression of training volume during resistive training to counteract quadriceps dysfunction within the COPD population. Still, considering the small sample size and the post hoc nature of our analyses, these results should be interpreted cautiously, and further research is necessary.
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Affiliation(s)
- Andre Nyberg
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
- Department of Community Medicine and Rehabilitation, section of Physiotherapy, Umeå University, Umeå, Sweden
- *Correspondence: Andre Nyberg,
| | - Nadia Milad
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Mickael Martin
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Dany Patoine
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Mathieu C Morissette
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Didier Saey
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - François Maltais
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
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5
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Tehrani AY, White Z, Tung LW, Zhao RRY, Milad N, Seidman MA, Sauge E, Theret M, Rossi FMV, Esfandiarei M, van Breemen C, Bernatchez P. Pleiotropic activation of endothelial function by angiotensin II receptor blockers is crucial to their protective anti-vascular remodeling effects. Sci Rep 2022; 12:9771. [PMID: 35697767 PMCID: PMC9192586 DOI: 10.1038/s41598-022-13772-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 05/27/2022] [Indexed: 11/21/2022] Open
Abstract
There are no therapeutics that directly enhance chronic endothelial nitric oxide (NO) release, which is typically associated with vascular homeostasis. In contrast, angiotensin II (AngII) receptor type 1 (AT1R) blockers (ARBs) can attenuate AngII-mediated oxidative stress, which often leads to increased endothelial NO bioavailability. Herein, we investigate the potential presence of direct, AngII/AT1R-independent ARB class effects on endothelial NO release and how this may result in enhanced aortic wall homeostasis and endothelial NO-specific transcriptome changes. Treatment of mice with four different ARBs induced sustained, long-term inhibition of vascular contractility by up to 82% at 16 weeks and 63% at 2 weeks, an effect reversed by L-NAME and absent in endothelial NO synthase (eNOS) KO mice or angiotensin converting enzyme inhibitor captopril-treated animals. In absence of AngII or in tissues with blunted AT1R expression or incubated with an AT2R blocker, telmisartan reduced vascular tone, supporting AngII/AT1R-independent pleiotropism. Finally, telmisartan was able to inhibit aging- and Marfan syndrome (MFS)-associated aortic root widening in NO-sensitive, BP-independent fashions, and correct aberrant TGF-β signaling. RNAseq analyses of aortic tissues identified early eNOS-specific transcriptome reprogramming of the aortic wall in response to telmisartan. This study suggests that ARBs are capable of major class effects on vasodilatory NO release in fashions that may not involve blockade of the AngII/AT1R pathway. Broader prophylactic use of ARBs along with identification of non-AngII/AT1R pathways activated by telmisartan should be investigated.
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Affiliation(s)
- Arash Y Tehrani
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada.,Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2176 Health Sciences Mall, Room 217, Vancouver, BC, V6T 1Z3, Canada
| | - Zoe White
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada.,Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2176 Health Sciences Mall, Room 217, Vancouver, BC, V6T 1Z3, Canada
| | - Lin Wei Tung
- School of Biomedical Engineering and Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
| | - Roy Ru Yi Zhao
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada.,Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2176 Health Sciences Mall, Room 217, Vancouver, BC, V6T 1Z3, Canada
| | - Nadia Milad
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada.,Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2176 Health Sciences Mall, Room 217, Vancouver, BC, V6T 1Z3, Canada
| | - Michael A Seidman
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada.,Laboratory Medicine Program, University Health Network, Toronto, ON, Canada
| | - Elodie Sauge
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada.,Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2176 Health Sciences Mall, Room 217, Vancouver, BC, V6T 1Z3, Canada
| | - Marine Theret
- School of Biomedical Engineering and Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
| | - Fabio M V Rossi
- School of Biomedical Engineering and Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
| | - Mitra Esfandiarei
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2176 Health Sciences Mall, Room 217, Vancouver, BC, V6T 1Z3, Canada.,Department of Biomedical Sciences, College of Graduate Studies, Midwestern University, Glendale, AZ, USA
| | - Casey van Breemen
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2176 Health Sciences Mall, Room 217, Vancouver, BC, V6T 1Z3, Canada
| | - Pascal Bernatchez
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada. .,Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2176 Health Sciences Mall, Room 217, Vancouver, BC, V6T 1Z3, Canada.
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6
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Milad N, Pineault M, Bouffard G, Maranda-Robitaille M, Lechasseur A, Beaulieu MJ, Aubin S, Jensen BAH, Morissette MC. Recombinant human β-defensin 2 delivery improves smoking-associated lung neutrophilia and bacterial exacerbation. Am J Physiol Lung Cell Mol Physiol 2022; 323:L37-L47. [DOI: 10.1152/ajplung.00027.2022] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Treatment of the cigarette smoke-associated lung disease has largely focused on broad-spectrum anti-inflammatory therapies. However, these therapies, such as high-dose inhaled corticosteroids, enhance patient susceptibility to lung infection and exacerbation. Our objective was to assess whether the host-defense peptide, human beta-defensin 2 (hBD-2), can simultaneously reduce pulmonary inflammation in cigarette smoke-exposed mice while maintaining immune competence during bacterial exacerbation. Mice were exposed to cigarette smoke acutely (4 days) or chronically (5 days/week for 7 weeks) and administered hBD-2 intranasally or by gavage. In a separate model of acute exacerbation, chronically exposed mice treated with hBD-2 were infected with non-typeable Haemophilus influenzae prior to sacrifice. In the acute exposure model, cigarette smoke-associated pulmonary neutrophilia was significantly blunted by both local and systemic hBD-2 administration. Similarly, chronically exposed mice administered hBD-2 therapeutically exhibited reduced pulmonary neutrophil infiltration and downregulated pro-inflammatory signaling in the lungs compared to vehicle-treated mice. Finally, in a model of acute bacterial exacerbation, hBD-2 administration effectively limited neutrophil infiltration in the lungs while markedly reducing pulmonary bacterial load. This study shows that hBD-2 treatment can significantly attenuate lung neutrophilia induced by cigarette smoke exposure while preserving immune competence and promoting an appropriate host-defense response to bacterial stimuli.
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Affiliation(s)
- Nadia Milad
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Faculty of Medicine, Université Laval, Quebec City, QC, Canada
| | - Marie Pineault
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Faculty of Medicine, Université Laval, Quebec City, QC, Canada
| | - Gabrielle Bouffard
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Faculty of Medicine, Université Laval, Quebec City, QC, Canada
| | - Michael Maranda-Robitaille
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Faculty of Medicine, Université Laval, Quebec City, QC, Canada
| | - Ariane Lechasseur
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Faculty of Medicine, Université Laval, Quebec City, QC, Canada
| | | | - Sophie Aubin
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
| | - Benjamin A. H. Jensen
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen, Denmark
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Mathieu C. Morissette
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
- Department of Medicine, Université Laval, Quebec City, QC, Canada
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Pineault M, Bouffard G, Milad N, Tremblay F, Lechasseur A, Routhier J, Aubin S, Beaulieu MJ, Bossé Y, Maltais F, Morissette MC. The mutation PTPN6Ala455Thr causing pulmonary emphysema affects B lymphocyte populations and causes spontaneous pulmonary tertiary lymphoid tissue formation. The Journal of Immunology 2022. [DOI: 10.4049/jimmunol.208.supp.112.18] [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
Background
A new mutation responsible for causing severe and early pulmonary emphysema was recently discovered in a French-Canadian family. The mutation is located in the PTPN6 gene (PTPN6Ala455Thr) leading to a reduction in the activity of SHP-1, a phosphatase that regulates numerous pathways including B cell differentiation and activation. Here, we aimed to characterize B cell abnormalities in both humans and mice carrying this mutation.
Methods
Circulating B cell populations in humans carrying the PTPN6Ala455Thr mutation were analyzed by flow cytometry and immunoglobulin levels were measured in serum. In mice carrying the same mutation (Ptpn6Ala457Thr) aged up to 12 months, B cell populations were analyzed by flow cytometry and lung tissue histology performed. Mice were immunized with the T cell-independent antigen NP-Ficoll and plasma was collected to assess NP-specific antibodies.
Results
Human carriers of the PTPN6Ala455Thr mutation had reduced IgG1 and IgG4, and increased IgG3 levels as well as high circulating immature/mature B cell ratio compared to controls. Aging Ptpn6Ala457Thr mice developed spontaneous pulmonary tertiary lymphoid tissues and exhibited higher B-1 cells and lower B-2 cells proportions in the lung and spleen. Ptpn6Ala457Thr mice had lower levels of NP-specific IgG1 antibodies compared to the wild-type group, but normal IgG3 in response to NP-Ficoll immunization.
Conclusion
SHP-1 appears to be important to B cell development and functions, as the PTPN6Ala455Thr mutation seems to cause a form of subclinical immunodeficiency that affects B cell populations and immunoglobulin levels. The link between B cell abnormalities and development of pulmonary emphysema requires further investigation.
Supported by grants from Canadian Institutes of Health and Research and Fonds de Recherche du Québec- Santé
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Affiliation(s)
- Marie Pineault
- 1Quebec Heart and Lung Institute - Université Laval, Canada
- 2Faculty of Medicine, Université Laval, Canada
| | - Gabrielle Bouffard
- 1Quebec Heart and Lung Institute - Université Laval, Canada
- 2Faculty of Medicine, Université Laval, Canada
| | - Nadia Milad
- 1Quebec Heart and Lung Institute - Université Laval, Canada
- 2Faculty of Medicine, Université Laval, Canada
| | - Félix Tremblay
- 1Quebec Heart and Lung Institute - Université Laval, Canada
- 2Faculty of Medicine, Université Laval, Canada
| | | | | | - Sophie Aubin
- 1Quebec Heart and Lung Institute - Université Laval, Canada
| | | | - Yohan Bossé
- 1Quebec Heart and Lung Institute - Université Laval, Canada
- 3Department of Molecular Medicine, Université Laval, Canada
| | - François Maltais
- 1Quebec Heart and Lung Institute - Université Laval, Canada
- 4Department of Medicine, Université Laval, Canada
| | - Mathieu C Morissette
- 1Quebec Heart and Lung Institute - Université Laval, Canada
- 4Department of Medicine, Université Laval, Canada
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Milad N, Pineault M, Beaulieu MJ, Aubin S, Jensen BAH, Morissette M. Human β-defensin 2 (hBD-2) improves neutrophilia and bacterial clearance during cigarette smoke exposure. The Journal of Immunology 2022. [DOI: 10.4049/jimmunol.208.supp.50.09] [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
Rationale
Treatment of cigarette smoke-associated lung diseases has largely focused on broad-spectrum anti-inflammatory therapies, such as inhaled corticosteroids. However, these therapies have recently been shown to enhance patient susceptibility to pneumonia.
Objective
Assess whether the anti-microbial peptide, human β-defensin 2 (hBD-2), can simultaneously reduce pulmonary inflammation in cigarette smoke-exposed mice while maintaining immune competence during bacterial exacerbation.
Methods
Mice were exposed to cigarette smoke acutely (4 days) or chronically (5 days/week for 7 weeks) and administered hBD-2 intranasally or by gavage. In a separate model of acute exacerbation, chronically exposed mice treated with hBD-2 were infected with non-typeable Haemophilus influenzae prior to sacrifice.
Results
In the acute exposure model, cigarette smoke-associated pulmonary neutrophilia was significantly blunted by both local and systemic hBD-2 administration. Similarly, chronically exposed mice administered hBD-2 therapeutically exhibited reduced pulmonary neutrophil infiltration and downregulated pro-inflammatory signaling in the lungs compared to vehicle-treated mice, as assessed via microarray. Finally, in a model of bacterial exacerbation, hBD-2 administration effectively limited neutrophil infiltration in the lungs while markedly reducing pulmonary bacterial load.
Conclusions
This study shows that hBD-2 treatment can significantly attenuate lung neutrophilia induced by cigarette smoke exposure while preserving immune competence and promoting an appropriate host-defense response to bacterial stimuli.
Supported by CIHR
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9
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White Z, Theret M, Milad N, Tung LW, Chen WWH, Sirois MG, Rossi F, Bernatchez P. Cholesterol absorption blocker ezetimibe prevents muscle wasting in severe dysferlin-deficient and mdx mice. J Cachexia Sarcopenia Muscle 2022; 13:544-560. [PMID: 34927367 PMCID: PMC8818667 DOI: 10.1002/jcsm.12879] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 10/26/2021] [Accepted: 10/29/2021] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Muscular dystrophy (MD) causes muscle wasting and is often lethal in patients due to a lack of proven therapies. In contrast, mouse models of MD are notoriously mild. We have previously shown severe human-like muscle pathology in mdx [Duchenne MD (DMD)] and dysferlin-deficient limb-girdle MD type 2B (LGMD2B) mice by inactivating the gene encoding for apolipoprotein E (ApoE), a lipid transporter synthesized by the liver, brain and adipocytes to regulate lipid and fat metabolism. Having recently established that human DMD is a novel type of primary genetic dyslipidaemia with elevated cholesterol, we sought to determine whether cholesterol could exacerbate the muscle wasting process observed in severe rodent MD. METHODS Severe mdx and dysferlin knock-out mice lacking ApoE were treated with ezetimibe (15 mg/kg/day), a clinically approved drug exhibiting few pleiotropic effects. In separate studies, dietary cholesterol was raised (from 0.2% to 2% cholesterol) in combination with experimental micro-injury and direct cholesterol injection assays. Muscles were assessed histologically for changes in collagen and adipocyte infiltration and both transcriptomic and cellular changes by RNA-seq and fluorescence-activated cell sorting analysis. RESULTS Treatment of severe DMD and LGMD2B mice with ezetimibe completely prevented clinical signs of ambulatory dysfunction (0% incidence vs. 33% for vehicle treatment; P < 0.05). Histological analyses revealed that ezetimibe-reduced fibro-fatty infiltration up to 84% and 63% in severely affected triceps (P ≤ 0.0001) and gastrocnemius (P ≤ 0.003) muscles, resulting in a respective 1.9-fold and 2.2-fold retention of healthy myofibre area (P ≤ 0.0001). Additionally, raising dietary cholesterol and thus concentrations of plasma low-density lipoprotein-associated cholesterol (by 250%; P < 0.0001) reduced overall survivability (by 100%; P < 0.001) and worsened muscle damage in the LGMD2B triceps by 767% (P < 0.03). Micro-pin-induced mechanical injury in LGMD2B mice fed a high cholesterol diet exacerbated muscle damage by 425% (P < 0.03) and increased macrophage recruitment (by 98%; P = 0.03) compared with those injured on a chow diet. Parallel RNA-seq analyses revealed that injury in cholesterol-fed mice also modulated the expression of 3671 transcripts (1953 up-regulated), with fibrogenic, inflammatory and programmed cell death-associated pathways among the most enriched. Mice lacking dysferlin also displayed heightened muscle necrosis (by 123%; P < 0.0001) following a direct intramuscular injection of cholesterol compared with control mice. CONCLUSIONS Cholesterol exacerbates rodent MD. Specific inhibition of cholesterol absorption with ezetimibe may safely attenuate human MD severity and delay death.
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Affiliation(s)
- Zoe White
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
| | - Marine Theret
- School of Biomedical Engineering, Department of Medical Genetics, University of British Columbia (UBC), Vancouver, BC, Canada
| | - Nadia Milad
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
| | - Lin Wei Tung
- School of Biomedical Engineering, Department of Medical Genetics, University of British Columbia (UBC), Vancouver, BC, Canada
| | - William Wei-Han Chen
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
| | - Martin G Sirois
- Montreal Heart Institute, Department of Pharmacology and Physiology, Université de Montréal, Montreal, QC, Canada
| | - Fabio Rossi
- School of Biomedical Engineering, Department of Medical Genetics, University of British Columbia (UBC), Vancouver, BC, Canada
| | - Pascal Bernatchez
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
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10
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Lechasseur A, Mouchiroud M, Tremblay F, Bouffard G, Milad N, Pineault M, Maranda‐Robitaille M, Routhier J, Beaulieu M, Aubin S, Laplante M, Morissette MC. Glycerol contained in vaping liquids affects the liver and aspects of energy homeostasis in a sex-dependent manner. Physiol Rep 2022; 10:e15146. [PMID: 35075822 PMCID: PMC8787618 DOI: 10.14814/phy2.15146] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 11/24/2022] Open
Abstract
Vaping is increasingly popular among the young and adult population. Vaping liquids contained in electronic cigarettes (e-cigarettes) are mainly composed of propylene glycol and glycerol, to which nicotine and flavors are added. Among several biological processes, glycerol is a metabolic substrate used for lipid synthesis in fed state as well as glucose synthesis in fasting state. We aimed to investigate the effects of glycerol e-cigarette aerosol exposure on the aspects of glycerol and glucose homeostasis. Adult and young male and female mice were exposed to e-cigarette aerosols with glycerol as vaping liquid using an established whole-body exposure system. Mice were exposed acutely (single 2-h exposure) or chronically (2 h/day, 5 days/week for 9 weeks). Circulating glycerol and glucose levels were assessed and glycerol as well as glucose tolerance tests were performed. The liver was also investigated to assess changes in the histology, lipid content, inflammation, and stress markers. Lung functions were also assessed as well as hepatic mRNA expression of genes controlling the circadian rhythm. Acute exposure to glycerol aerosols generated by an e-cigarette increased circulating glycerol levels in female mice. Increased hepatic triglyceride and phosphatidylcholine concentrations were observed in female mice with no increase in circulating alanine aminotransferase or evidence of inflammation, fibrosis, or endoplasmic reticulum stress. Chronic exposure to glycerol e-cigarette aerosols mildly impacted glucose tolerance test in young female and male mice. Fasting glycerol, glucose, and insulin remained unchanged. Increased pulmonary resistance was observed in young male mice. Taken together, this study shows that the glycerol contained in vaping liquids can affect the liver as well as the aspects of glucose and glycerol homeostasis. Additional work is required to translate these observations to humans and determine the biological and potential pathological impacts of these findings.
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Affiliation(s)
- Ariane Lechasseur
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
- Faculty of MedicineUniversité LavalQuebecQuebecCanada
| | - Mathilde Mouchiroud
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
- Faculty of MedicineUniversité LavalQuebecQuebecCanada
| | - Félix Tremblay
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
- Faculty of MedicineUniversité LavalQuebecQuebecCanada
| | - Gabrielle Bouffard
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
- Faculty of MedicineUniversité LavalQuebecQuebecCanada
| | - Nadia Milad
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
- Faculty of MedicineUniversité LavalQuebecQuebecCanada
| | - Marie Pineault
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
- Faculty of MedicineUniversité LavalQuebecQuebecCanada
| | - Michaël Maranda‐Robitaille
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
- Faculty of MedicineUniversité LavalQuebecQuebecCanada
| | - Joanie Routhier
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
| | | | - Sophie Aubin
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
| | - Mathieu Laplante
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
- Department of MedicineUniversité LavalQuebecQuebecCanada
| | - Mathieu C. Morissette
- Quebec Heart and Lung InstituteUniversité LavalQuebecQuebecCanada
- Department of MedicineUniversité LavalQuebecQuebecCanada
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11
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Milad N, Morissette MC. Revisiting the role of pulmonary surfactant in chronic inflammatory lung diseases and environmental exposure. Eur Respir Rev 2021; 30:30/162/210077. [PMID: 34911693 DOI: 10.1183/16000617.0077-2021] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 08/05/2021] [Indexed: 12/12/2022] Open
Abstract
Pulmonary surfactant is a crucial and dynamic lung structure whose primary functions are to reduce alveolar surface tension and facilitate breathing. Though disruptions in surfactant homeostasis are typically thought of in the context of respiratory distress and premature infants, many lung diseases have been noted to have significant surfactant abnormalities. Nevertheless, preclinical and clinical studies of pulmonary disease too often overlook the potential contribution of surfactant alterations - whether in quantity, quality or composition - to disease pathogenesis and symptoms. In inflammatory lung diseases, whether these changes are cause or consequence remains a subject of debate. This review will outline 1) the importance of pulmonary surfactant in the maintenance of respiratory health, 2) the diseases associated with primary surfactant dysregulation, 3) the surfactant abnormalities observed in inflammatory pulmonary diseases and, finally, 4) the available research on the interplay between surfactant homeostasis and smoking-associated lung disease. From these published studies, we posit that changes in surfactant integrity and composition contribute more considerably to chronic inflammatory pulmonary diseases and that more work is required to determine the mechanisms underlying these alterations and their potential treatability.
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Affiliation(s)
- Nadia Milad
- Faculty of Medicine, Université Laval, Quebec City, QC, Canada.,Quebec Heart and Lung Institute - Université Laval, Quebec City, QC, Canada
| | - Mathieu C Morissette
- Quebec Heart and Lung Institute - Université Laval, Quebec City, QC, Canada .,Dept of Medicine, Faculty of Medicine, Université Laval, Quebec City, QC, Canada
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12
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White Z, Milad N, Sellers SL, Bernatchez P. Effect of Dysferlin Deficiency on Atherosclerosis and Plasma Lipoprotein Composition Under Normal and Hyperlipidemic Conditions. Front Physiol 2021; 12:675322. [PMID: 34366880 PMCID: PMC8339577 DOI: 10.3389/fphys.2021.675322] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 03/02/2021] [Accepted: 06/15/2021] [Indexed: 11/20/2022] Open
Abstract
Dysferlinopathies are a group of muscle disorders caused by mutations to dysferlin, a transmembrane protein involved in membrane patching events following physical damage to skeletal myofibers. We documented dysferlin expression in vascular tissues including non-muscle endothelial cells, suggesting that blood vessels may have an endogenous repair system that helps promote vascular homeostasis. To test this hypothesis, we generated dysferlin-null mice lacking apolipoprotein E (ApoE), a common model of atherosclerosis, dyslipidemia and endothelial injury when stressed with a high fat, and cholesterol-rich diet. Despite high dysferlin expression in mouse and human atheromatous plaques, loss of dysferlin did not affect atherosclerotic burden as measured in the aortic root, arch, thoracic, and abdominal aortic regions. Interestingly, we observed that dysferlin-null mice exhibit lower plasma high-density lipoprotein cholesterol (HDL-C) levels than their WT controls at all measured stages of the disease process. Western blotting revealed abundant dysferlin expression in protein extracts from mouse livers, the main regulator of plasma lipoprotein levels. Despite abnormal lipoprotein levels, Dysf/ApoE double knockout mice responded to cholesterol absorption blockade with lower total cholesterol and blunted atherosclerosis. Our study suggests that dysferlin does not protect against atherosclerosis or participate in cholesterol absorption blockade but regulates basal plasma lipoprotein composition. Dysferlinopathic patients may be dyslipidemic without greater atherosclerotic burden while remaining responsive to cholesterol absorption blockade.
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Affiliation(s)
- Zoe White
- Department of Anesthesiology, Pharmacology, and Therapeutics, The University of British Columbia, Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
| | - Nadia Milad
- Department of Anesthesiology, Pharmacology, and Therapeutics, The University of British Columbia, Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
| | - Stephanie L Sellers
- Department of Anesthesiology, Pharmacology, and Therapeutics, The University of British Columbia, Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
| | - Pascal Bernatchez
- Department of Anesthesiology, Pharmacology, and Therapeutics, The University of British Columbia, Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
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13
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Tehrani AY, White Z, Milad N, Esfandiarei M, Seidman MA, Bernatchez P. Blood pressure-independent inhibition of Marfan aortic root widening by the angiotensin II receptor blocker valsartan. Physiol Rep 2021; 9:e14877. [PMID: 34042309 PMCID: PMC8157789 DOI: 10.14814/phy2.14877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 01/31/2021] [Revised: 04/11/2021] [Accepted: 04/20/2021] [Indexed: 12/11/2022] Open
Abstract
Marfan syndrome (MFS) is a genetic disorder that results in accelerated aortic root widening and aneurysm. However, management of MFS patients with blood pressure (BP)-lowering medications, such as angiotensin II (AngII) receptor blocker (ARB) losartan, continues to pose challenges due to their questionable efficacy at attenuating the rate of aortic root widening in patients. Herein we investigate the anti-aortic root widening effects of a sub-BP-lowering dose valsartan, an ARB previously linked to non-BP lowering anti-remodeling effects. Despite absence of BP-lowering effects, valsartan attenuated MFS aortic root widening by 75.9%, which was similar to a hypotensive dose of losartan (79.4%) when assessed by ultrasound echocardiography. Medial thickening, elastic fiber fragmentation, and phospho-ERK signaling were also inhibited to a similar degree with both treatments. Valsartan and losartan decreased vascular contractility ex vivo between 60% and 80%, in a nitric oxide (NO)-sensitive fashion. Valsartan increased acetylcholine (Ach)-induced vessel relaxation and phospho-eNOS levels in the aortic vessel supporting BP-independent activation of protective endothelial function, which is critical to ARB-mediated aortic root stability. This study supports the concept of achieving aortic root stability with valsartan in absence of BP-lowering effects, which may help address efficacy and compliance issues with losartan-based MFS patient management.
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Affiliation(s)
- Arash Y. Tehrani
- Centre for Heart Lung InnovationUniversity of British ColumbiaVancouverBCCanada
- Department of AnesthesiologyPharmacology & TherapeuticsUniversity of British ColumbiaVancouverBCCanada
| | - Zoe White
- Centre for Heart Lung InnovationUniversity of British ColumbiaVancouverBCCanada
- Department of AnesthesiologyPharmacology & TherapeuticsUniversity of British ColumbiaVancouverBCCanada
| | - Nadia Milad
- Centre for Heart Lung InnovationUniversity of British ColumbiaVancouverBCCanada
- Department of AnesthesiologyPharmacology & TherapeuticsUniversity of British ColumbiaVancouverBCCanada
| | - Mitra Esfandiarei
- Department of AnesthesiologyPharmacology & TherapeuticsUniversity of British ColumbiaVancouverBCCanada
- Department of Biomedical SciencesCollege of Graduate StudiesMidwestern UniversityGlendaleArizonaUSA
| | - Michael A. Seidman
- Centre for Heart Lung InnovationDepartment of Pathology and Laboratory MedicineUniversity of British ColumbiaVancouverBCCanada
| | - Pascal Bernatchez
- Centre for Heart Lung InnovationUniversity of British ColumbiaVancouverBCCanada
- Department of AnesthesiologyPharmacology & TherapeuticsUniversity of British ColumbiaVancouverBCCanada
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14
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Milad N, Pineault M, Lechasseur A, Routhier J, Beaulieu MJ, Aubin S, Morissette MC. Neutrophils and IL-1α Regulate Surfactant Homeostasis during Cigarette Smoking. J Immunol 2021; 206:1923-1931. [PMID: 33722877 DOI: 10.4049/jimmunol.2001182] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 02/08/2021] [Indexed: 11/19/2022]
Abstract
Cigarette smoke exposure induces inflammation marked by rapid and sustained neutrophil infiltration, IL-1α, release and altered surfactant homeostasis. However, the extent to which neutrophils and IL-1α contribute to the maintenance of pulmonary surfactant homeostasis is not well understood. We sought to investigate whether neutrophils play a role in surfactant clearance as well as the effect of neutrophil depletion and IL-1α blockade on the response to cigarette smoke exposure. In vitro and in vivo administration of fluorescently labeled surfactant phosphatidylcholine was used to assess internalization of surfactant by lung neutrophils and macrophages during or following cigarette smoke exposure in mice. We also depleted neutrophils using anti-Ly-6G or anti-Gr-1 Abs, or we neutralized IL-1α using a blocking Ab to determine their respective roles in regulating surfactant homeostasis during cigarette smoke exposure. We observed that neutrophils actively internalize labeled surfactant both in vitro and in vivo and that IL-1α is required for smoke-induced elevation of surfactant protein (SP)-A and SP-D levels. Neutrophil depletion during cigarette smoke exposure led to a further increase in SP-A levels in the bronchoalveolar lavage and increased IL-1α, CCL2, GM-CSF, and G-CSF release. Finally, macrophage expression of Mmp12, a protease linked to emphysema, was increased in neutrophil-depleted groups and decreased following IL-1α blockade. Taken together, our results indicate that neutrophils and IL-1α signaling are actively involved in surfactant homeostasis and that the absence of neutrophils in the lungs during cigarette smoke exposure leads to an IL-1α-dependent exacerbation of the inflammatory response.
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Affiliation(s)
- Nadia Milad
- Québec Heart and Lung Institute-Université Laval, Quebec City, Quebec G1V 4G5, Canada.,Faculty of Medicine, Université Laval, Quebec City, Quebec G1V 0A6, Canada; and
| | - Marie Pineault
- Québec Heart and Lung Institute-Université Laval, Quebec City, Quebec G1V 4G5, Canada.,Faculty of Medicine, Université Laval, Quebec City, Quebec G1V 0A6, Canada; and
| | - Ariane Lechasseur
- Québec Heart and Lung Institute-Université Laval, Quebec City, Quebec G1V 4G5, Canada.,Faculty of Medicine, Université Laval, Quebec City, Quebec G1V 0A6, Canada; and
| | - Joanie Routhier
- Québec Heart and Lung Institute-Université Laval, Quebec City, Quebec G1V 4G5, Canada
| | - Marie-Josée Beaulieu
- Québec Heart and Lung Institute-Université Laval, Quebec City, Quebec G1V 4G5, Canada
| | - Sophie Aubin
- Québec Heart and Lung Institute-Université Laval, Quebec City, Quebec G1V 4G5, Canada
| | - Mathieu C Morissette
- Québec Heart and Lung Institute-Université Laval, Quebec City, Quebec G1V 4G5, Canada; .,Department of Medicine, Université Laval, Quebec City, Quebec G1V 0A6, Canada
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15
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Nyberg A, Martin M, Saey D, Milad N, Patoine D, Morissette MC, Auger D, Stål P, Maltais F. Effects of Low-Load/High-Repetition Resistance Training on Exercise Capacity, Health Status, and Limb Muscle Adaptation in Patients With Severe COPD: A Randomized Controlled Trial. Chest 2020; 159:1821-1832. [PMID: 33316237 DOI: 10.1016/j.chest.2020.12.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 10/09/2020] [Revised: 11/14/2020] [Accepted: 12/03/2020] [Indexed: 10/22/2022] Open
Abstract
BACKGROUND Training volume is paramount in the magnitude of physiological adaptations following resistance training. However, patients with severe COPD are limited by dyspnea during traditional two-limb low-load/high-repetition resistance training (LLHR-RT), resulting in suboptimal training volumes. During a single exercise session, single-limb LLHR-RT decreases the ventilatory load and enables higher localized training volumes compared with two-limb LLHR-RT. RESEARCH QUESTION Does single-limb LLHR-RT lead to more profound effects compared with two-limb LLHR-RT on exercise capacity (6-min walk distance [6MWD]), health status, muscle function, and limb adaptations in patients with severe COPD? STUDY DESIGN AND METHODS Thirty-three patients (mean age 66 ± 7 years; FEV1 39 ± 10% predicted) were randomized to 8 weeks of single- or two-limb LLHR-RT. Exercise capacity (6MWD), health status, and muscle function were compared between groups. Quadriceps muscle biopsy specimens were collected to examine physiological responses. RESULTS Single-limb LLHR-RT did not further enhance 6MWD compared with two-limb LLHR-RT (difference, 14 [-12 to 39 m]. However, 73% in the single-limb group exceeded the known minimal clinically important difference of 30 m compared with 25% in the two-limb group (P = .02). Health status and muscle function improved to a similar extent in both groups. During training, single-limb LLHR-RT resulted in a clinically relevant reduction in dyspnea during training compared with two-limb LLHR-RT (-1.75; P = .01), but training volume was not significantly increased (23%; P = .179). Quadriceps muscle citrate synthase activity (19%; P = .03), hydroxyacyl-coenzyme A dehydrogenase protein levels (32%; P < .01), and capillary-to-fiber ratio (41%; P < .01) were increased compared with baseline after pooling muscle biopsy data from all participants. INTERPRETATION Single-limb LLHR-RT did not further increase mean 6MWD compared with two-limb LLHR-RT, but it reduced exertional dyspnea and enabled more people to reach clinically relevant improvements in 6MWD. Independent of execution strategy, LLHR-RT improved exercise capacity, health status, muscle endurance, and enabled several physiological muscle adaptations, reducing the negative consequences of limb muscle dysfunction in COPD. CLINICAL TRIAL REGISTRATION ClinicalTrials.gov; No.: NCT02283580; URL: www.clinicaltrials.gov.
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Affiliation(s)
- Andre Nyberg
- Department of Community Medicine and Rehabilitation, Section of Physiotherapy, Umeå University, Umeå, Sweden; Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada.
| | - Mickael Martin
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Didier Saey
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Nadia Milad
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Dany Patoine
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Mathieu C Morissette
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Dominique Auger
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Per Stål
- Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Francois Maltais
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
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16
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Jubinville É, Milad N, Maranda-Robitaille M, Lafrance MA, Pineault M, Lamothe J, Routhier J, Beaulieu MJ, Aubin S, Laplante M, Morissette MC. Critical importance of dietary methionine and choline in the maintenance of lung homeostasis during normal and cigarette smoke exposure conditions. Am J Physiol Lung Cell Mol Physiol 2020; 319:L391-L402. [PMID: 32640840 DOI: 10.1152/ajplung.00353.2019] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Genetic predispositions and environmental exposures are regarded as the main predictors of respiratory disease development. Although the impact of dietary essential nutrient deficiencies on cardiovascular disease, obesity, and type II diabetes has been widely studied, it remains poorly explored in chronic respiratory diseases. Dietary choline and methionine deficiencies are common in the population, and their impact on pulmonary homeostasis is currently unknown. Mice were fed choline- and/or methionine-deficient diets while being exposed to room-air or cigarette smoke for up to 4 wk. Lung functions were assessed using the FlexiVent. Pulmonary transcriptional activity was assessed using gene expression microarrays and quantitative PCR. Immune cells, cytokines, and phosphatidylcholine were quantified in the bronchoalveolar lavage. In this study, we found that short-term dietary choline and/or methionine deficiencies significantly affect lung function in mice in a reversible manner. It also reduced transcriptional levels of collagens and elastin as well as pulmonary surfactant phosphatidylcholine levels. We also found that dietary choline and/or methionine deficiencies markedly interfered with the pulmonary response to cigarette smoke exposure, modulating lung function and dampening inflammation. These findings clearly show that dietary choline and/or methionine deficiencies can have dramatic pathophysiological effects on the lungs and can also affect the pathobiology of cigarette smoke-induced pulmonary alterations. Expanding our knowledge in the field of "nutri-respiratory research" may reveal a crucial role for essential nutrients in pulmonary health and disease, which may prove to be as relevant as genetic predispositions and environmental exposures.
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Affiliation(s)
- Éric Jubinville
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
| | - Nadia Milad
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
| | - Michaël Maranda-Robitaille
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
| | - Marc-Alexandre Lafrance
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
| | - Marie Pineault
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
| | - Jennifer Lamothe
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
| | - Joanie Routhier
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
| | | | - Sophie Aubin
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
| | - Mathieu Laplante
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
- Department of Medicine, Université Laval, Quebec City, Canada
- Centre de Recherche sur le Cancer de l'Université Laval, Quebec City, Canada
| | - Mathieu C Morissette
- Quebec Heart and Lung Institute, Université Laval, Quebec City, Canada
- Department of Medicine, Université Laval, Quebec City, Canada
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17
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Pineault M, Milad N, Lechasseur A, Beaulieu MJ, Routhier J, Aubin S, Maltais F, Morissette M. Characterization of immune anomalies caused by the ptpn6Ala457Thr mutation associated with a specific form of pulmonary emphysema. The Journal of Immunology 2020. [DOI: 10.4049/jimmunol.204.supp.154.10] [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
A new mutation (PTPN6Ala455Thr) was recently discovered in a family in which many members developed a severe, early and panacinar form of pulmonary emphysema. The mutation was found to be located in the PTPN6 gene, encoding a tyrosine phosphatase known as SHP-1. SHP-1 regulates immunological signaling pathways, such as those involved in B cells maturation and activation.
To characterize the impact of the ptpn6Ala457Thr mutation in a mouse model on subpopulations of B lymphocytes and on their response to immunization.
Proportions of B1a et B2 cells were analyzed in the lungs and spleens of 4-month old mice carrying the ptpn6Ala457Thr mutation by flow cytometry. Serum immunoglobulin levels were assessed. Another group of mice were immunized with a T cells-independent antigen (NP-Ficoll, 50ug i.p.). Plasma was collected at different timepoints after immunization and NP-specific antibodies were measured by ELISA (IgG1, IgG3, IgM and IgA).
Mice carrying the ptpn6Ala457Thr mutation mice had a higher proportion of B1a cells and a lower proportion of B2 cells in the spleen and in the lungs. Total IgG and IgM levels in the serum were higher in ptpn6Ala457Thr mice compared to wild-type animals. Following immunization with NP-Ficoll, ptpn6Ala457Thr mice displayed levels of NP-specific IgG3 and IgM similar to those observed in wild-type mice. However, ptpn6Ala457Thr mice had lower levels of NP-specific IgG1 antibodies compared to the wild-type group.
SHP-1 seems to be important for B cell differentiation and functions, as the mutation led to significant changes in B cell subpopulations. It seems that SHP-1 plays an important role in the immune response to immunization. The full scope of the immunological effects of this mutation requires further study.
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Affiliation(s)
- Marie Pineault
- 1Quebec Heart and Lung Institute, Canada
- 2University Laval, Canada
| | - Nadia Milad
- 1Quebec Heart and Lung Institute, Canada
- 2University Laval, Canada
| | | | | | | | | | - François Maltais
- 1Quebec Heart and Lung Institute, Canada
- 2University Laval, Canada
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Milad N, Pineault M, Lechasseur A, Routhier J, Beaulieu MJ, Aubin S, Morissette M. Neutrophils are actively involved in the regulation of inflammation and the maintenance of surfactant homeostasis during cigarette smoke exposure. The Journal of Immunology 2020. [DOI: 10.4049/jimmunol.204.supp.148.10] [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
Rationale
Exposure to cigarette smoke induces inflammation marked by rapid and sustained neutrophil infiltration as well as pulmonary surfactant damage. However, the extent to which neutrophils contribute to the clearance of surfactant and the inflammatory response to cigarette smoke exposure is not fully understood.
Objective
We aim 1) to assess the capacity of neutrophils to internalise surfactant and 2) to determine whether neutrophil depletion has an effect on surfactant homeostasis and the inflammatory response induced by cigarette smoke exposure.
Methods/Results
1) By incubating cells isolated from the bronchoalveolar lavage of cigarette smoke exposed mice with fluorescently labelled surfactant (NBD-phosphatidylcholine), we observed via microscopy significant in vitro surfactant internalisation by neutrophils. Similarly, neutrophils absorbed labelled surfactant delivered intranasally in vivo as measured by flow cytometry. 2) Neutrophil depletion during cigarette smoke exposure via injection of depleting antibodies (anti-Ly6G or anti-Gr-1) led to exaggerated pro-inflammatory cytokine release (IL-1α, CCL2, GM-CSF and G-CSF) and increased macrophage protease expression (Mmp12). Depletion of neutrophils also led to increased surfactant protein levels (SP-A and SP-D).
Conclusions
Our results show that neutrophils recruited to the lungs during cigarette smoke exposure internalise pulmonary surfactant and that their absence leads to exacerbation of the pro-inflammatory response and alterations to surfactant composition. Therefore, neutrophils seem to play a crucial role in the maintenance of pulmonary homeostasis following cigarette smoke exposure.
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White Z, Milad N, Tehrani AY, Chen WWH, Donen G, Sellers SL, Bernatchez P. Angiotensin II receptor blocker losartan exacerbates muscle damage and exhibits weak blood pressure-lowering activity in a dysferlin-null model of Limb-Girdle muscular dystrophy type 2B. PLoS One 2019; 14:e0220903. [PMID: 31404091 PMCID: PMC6690544 DOI: 10.1371/journal.pone.0220903] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 07/25/2019] [Indexed: 01/01/2023] Open
Abstract
There is no cure or beneficial management option for Limb-Girdle muscular dystrophy (MD) type 2B (LGMD2B). Losartan, a blood pressure (BP) lowering angiotensin II (AngII) receptor type 1 (ATR1) blocker (ARB) with unique anti-transforming growth factor-β (TGF-β) properties, can protect muscles in various types of MD such as Duchenne MD, suggesting a potential benefit for LGMD2B patients. Herein, we show in a mild, dysferlin-null mouse model of LGMD2B that losartan increased quadriceps muscle fibrosis (142%; P<0.0001). In a severe, atherogenic diet-fed model of LGMD2B recently described by our group, losartan further exacerbated dysferlin-null mouse muscle wasting in quadriceps and triceps brachii, two muscles typically affected by LGMD2B, by 40% and 51%, respectively (P<0.05). Lower TGF-β signalling was not observed with losartan, therefore plasma levels of atherogenic lipids known to aggravate LGMD2B severity were investigated. We report that losartan increased both plasma triglycerides and cholesterol concentrations in dysferlin-null mice. Other protective properties of losartan, such as increased nitric oxide release and BP lowering, were also reduced in the absence of dysferlin expression. Our data suggest that LGMD2B patients may show some resistance to the primary BP-lowering effects of losartan along with accelerated muscle wasting and dyslipidemia. Hence, we urge caution on the use of ARBs in this population as their ATR1 pathway may be dysfunctional.
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Affiliation(s)
- Zoe White
- University of British Columbia (UBC) Department of Anesthesiology, Pharmacology & Therapeutics, Vancouver, Canada
- UBC Centre for Heart Lung Innovation & St. Paul’s Hospital, Vancouver, Canada
- * E-mail: (ZW); (PB)
| | - Nadia Milad
- University of British Columbia (UBC) Department of Anesthesiology, Pharmacology & Therapeutics, Vancouver, Canada
- UBC Centre for Heart Lung Innovation & St. Paul’s Hospital, Vancouver, Canada
| | - Arash Y. Tehrani
- University of British Columbia (UBC) Department of Anesthesiology, Pharmacology & Therapeutics, Vancouver, Canada
- UBC Centre for Heart Lung Innovation & St. Paul’s Hospital, Vancouver, Canada
| | - William Wei-Han Chen
- University of British Columbia (UBC) Department of Anesthesiology, Pharmacology & Therapeutics, Vancouver, Canada
- UBC Centre for Heart Lung Innovation & St. Paul’s Hospital, Vancouver, Canada
| | - Graham Donen
- University of British Columbia (UBC) Department of Anesthesiology, Pharmacology & Therapeutics, Vancouver, Canada
- UBC Centre for Heart Lung Innovation & St. Paul’s Hospital, Vancouver, Canada
| | - Stephanie L. Sellers
- University of British Columbia (UBC) Department of Anesthesiology, Pharmacology & Therapeutics, Vancouver, Canada
- UBC Centre for Heart Lung Innovation & St. Paul’s Hospital, Vancouver, Canada
| | - Pascal Bernatchez
- University of British Columbia (UBC) Department of Anesthesiology, Pharmacology & Therapeutics, Vancouver, Canada
- UBC Centre for Heart Lung Innovation & St. Paul’s Hospital, Vancouver, Canada
- * E-mail: (ZW); (PB)
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White Z, Milad N, Tehrani AY, Lamothe J, Hogg JC, Esfandiarei M, Seidman M, Booth S, Hackett TL, Morissette MC, Bernatchez P. Sildenafil Prevents Marfan-Associated Emphysema and Early Pulmonary Artery Dilation in Mice. Am J Pathol 2019; 189:1536-1546. [PMID: 31125551 DOI: 10.1016/j.ajpath.2019.05.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 04/29/2019] [Accepted: 05/02/2019] [Indexed: 01/24/2023]
Abstract
Marfan syndrome (MFS) is a connective tissue disorder caused by mutations in fibrillin-1 (Fbn1). Although aortic rupture is the major cause of mortality in MFS, patients also experience pulmonary complications, which are poorly understood. Loss of basal nitric oxide (NO) production and vascular integrity has been implicated in MFS aortic root disease, yet their contribution to lung complications remains unknown. Because of its capacity to potentiate the vasodilatory NO/cyclic guanylate monophosphate signaling pathway, we assessed whether the phosphodiesterase-5 inhibitor, sildenafil (SIL), could attenuate aortic root remodeling and emphysema in a mouse model of MFS. Despite increasing NO-dependent vasodilation, SIL unexpectedly elevated mean arterial blood pressure, failed to inhibit MFS aortic root dilation, and exacerbated elastic fiber fragmentation. In the lung, early pulmonary artery dilation observed in untreated MFS mice was delayed by SIL treatment, and the severe emphysema-like alveolar destruction was prevented. In addition, improvements in select parameters of lung function were documented. Subsequent microarray analyses showed changes to gene signatures involved in the inflammatory response in the MFS lung treated with SIL, without significant down-regulation of connective tissue or transforming growth factor-β signaling genes. Because phosphodiesterase-5 inhibition leads to improved lung histopathology and function, the effects of SIL against emphysema warrant further investigation in the settings of MFS despite limited efficacy on aortic root remodeling.
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Affiliation(s)
- Zoe White
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada; Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada
| | - Nadia Milad
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada; Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada; Quebec Heart and Lung Institute, Université Laval, Québec City, Quebec, Canada; Department of Medicine, Université Laval, Québec City, Quebec, Canada
| | - Arash Y Tehrani
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada; Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada
| | - Jennifer Lamothe
- Quebec Heart and Lung Institute, Université Laval, Québec City, Quebec, Canada; Department of Medicine, Université Laval, Québec City, Quebec, Canada
| | - James C Hogg
- Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Mitra Esfandiarei
- Department of Biomedical Sciences, College of Graduate Studies, Midwestern University, Glendale, Arizona
| | - Michael Seidman
- Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada; Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Steven Booth
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada; Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada
| | - Tillie-Louise Hackett
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada; Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada
| | - Mathieu C Morissette
- Quebec Heart and Lung Institute, Université Laval, Québec City, Quebec, Canada; Department of Medicine, Université Laval, Québec City, Quebec, Canada
| | - Pascal Bernatchez
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada; Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada.
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21
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Sellers SL, Milad N, Chan R, Mielnik M, Jermilova U, Huang PL, de Crom R, Hirota JA, Hogg JC, Sandor GG, Van Breemen C, Esfandiarei M, Seidman MA, Bernatchez P. Inhibition of Marfan Syndrome Aortic Root Dilation by Losartan: Role of Angiotensin II Receptor Type 1-Independent Activation of Endothelial Function. Am J Pathol 2019; 188:574-585. [PMID: 29433732 DOI: 10.1016/j.ajpath.2017.11.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 10/18/2017] [Accepted: 11/16/2017] [Indexed: 01/13/2023]
Abstract
Marfan syndrome (MFS) is a genetic disorder that frequently leads to aortic root dissection and aneurysm. Despite promising preclinical and pilot clinical data, a recent large-scale study using antihypertensive angiotensin II (AngII) receptor type 1 (ATR1) blocker losartan has failed to meet expectations at preventing MFS-associated aortic root dilation, casting doubts about optimal therapy. To study the deleterious role of normal ATR1 signaling in aortic root widening, we generated MFS mice lacking ATR1a expression in an attempt to preserve protective ATR2 signaling. Despite being hypotensive and resistant to AngII vasopressor effects, MFS/ATR1a-null mice showed unabated aortic root enlargement and remained fully responsive to losartan, confirming that blood pressure lowering is of minor therapeutic value in MFS and that losartan's antiremodeling properties may be ATR1 independent. Having shown that MFS causes endothelial dysfunction and that losartan can activate endothelial function in mice and patients, we found that nitric oxide synthase (NOS) inhibition renders losartan therapeutically inactive, whereas multiple transgenic and pharmacologic models of endothelial NOS activation block aortic root dilation by correcting extracellular signal-regulated kinase signaling. In vitro, losartan can increase endothelial NO release in the absence of AngII and correct MFS NO levels in vivo. Our data suggest that increased protective endothelial function, rather than ATR1 inhibition or blood pressure lowering, might be of therapeutic significance in preventing aortic root disease in MFS.
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Affiliation(s)
- Stephanie L Sellers
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia (UBC), Vancouver, British Columbia, Canada; UBC Centre for Heart Lung Innovation and St. Paul's Hospital, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Nadia Milad
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia (UBC), Vancouver, British Columbia, Canada; UBC Centre for Heart Lung Innovation and St. Paul's Hospital, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Rayleigh Chan
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia (UBC), Vancouver, British Columbia, Canada; UBC Centre for Heart Lung Innovation and St. Paul's Hospital, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Michael Mielnik
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia (UBC), Vancouver, British Columbia, Canada; UBC Centre for Heart Lung Innovation and St. Paul's Hospital, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Una Jermilova
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia (UBC), Vancouver, British Columbia, Canada; UBC Centre for Heart Lung Innovation and St. Paul's Hospital, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Paul L Huang
- Cardiovascular Research Centre, Massachusetts General Hospital, Harvard University, Charlestown, Massachusetts
| | - Rini de Crom
- Department of Cell Biology and Genetics, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Jeremy A Hirota
- UBC Centre for Heart Lung Innovation and St. Paul's Hospital, University of British Columbia (UBC), Vancouver, British Columbia, Canada; Division of Respiratory Medicine, Department of Medicine, Chan-Yeung Centre for Occupational and Environmental Respiratory Disease, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - James C Hogg
- UBC Centre for Heart Lung Innovation and St. Paul's Hospital, University of British Columbia (UBC), Vancouver, British Columbia, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - George G Sandor
- Providence Health Care, and the Child and Family Research Institute, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Casey Van Breemen
- Providence Health Care, and the Child and Family Research Institute, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Mitra Esfandiarei
- Department of Biomedical Sciences, Midwestern University, Glendale, Arizona
| | - Michael A Seidman
- UBC Centre for Heart Lung Innovation and St. Paul's Hospital, University of British Columbia (UBC), Vancouver, British Columbia, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Pascal Bernatchez
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia (UBC), Vancouver, British Columbia, Canada; UBC Centre for Heart Lung Innovation and St. Paul's Hospital, University of British Columbia (UBC), Vancouver, British Columbia, Canada.
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22
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Jubinville É, Routhier J, Maranda-Robitaille M, Pineault M, Milad N, Talbot M, Beaulieu MJ, Aubin S, Paré MÈ, Laplante M, Morissette MC. Pharmacological activation of liver X receptor during cigarette smoke exposure adversely affects alveolar macrophages and pulmonary surfactant homeostasis. Am J Physiol Lung Cell Mol Physiol 2019; 316:L669-L678. [PMID: 30702343 DOI: 10.1152/ajplung.00482.2018] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [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] [Indexed: 02/06/2023] Open
Abstract
Smoking alters pulmonary reverse lipid transport and leads to intracellular lipid accumulation in alveolar macrophages. We investigated whether stimulating reverse lipid transport with an agonist of the liver X receptor (LXR) would help alveolar macrophages limit lipid accumulation and dampen lung inflammation in response to cigarette smoke. Mice were exposed to cigarette smoke and treated intraperitoneally with the LXR agonist T0901317. Expression of lipid capture and lipid export genes was assessed in lung tissue and alveolar macrophages. Pulmonary inflammation was assessed in the bronchoalveolar lavage (BAL). Finally, cholesterol efflux capacity and pulmonary surfactant levels were determined. In room air-exposed mice, T0901317 increased the expression of lipid export genes in macrophages and the whole lung and increased cholesterol efflux capacity without inducing inflammation or affecting the pulmonary surfactant. However, cigarette smoke-exposed mice treated with T0901317 showed a marked increase in BAL neutrophils, IL-1α, C-C motif chemokine ligand 2, and granulocyte-colony-stimulating factor levels. T0901317 treatment in cigarette smoke-exposed mice failed to increase the ability of alveolar macrophages to export cholesterol and markedly exacerbated IL-1α release. Finally, T0901317 led to pulmonary surfactant depletion only in cigarette smoke-exposed mice. This study shows that hyperactivation of LXR and the associated lipid capture/export mechanisms only have minor pulmonary effects on the normal lung. However, in the context of cigarette smoke exposure, where the pulmonary surfactant is constantly oxidized, hyperactivation of LXR has dramatic adverse effects, once again showing the central role of lipid homeostasis in the pulmonary response to cigarette smoke exposure.
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Affiliation(s)
- Éric Jubinville
- Faculty of Medicine, Université Laval , Quebec City, Quebec , Canada
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
| | - Joanie Routhier
- Faculty of Medicine, Université Laval , Quebec City, Quebec , Canada
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
| | | | - Marie Pineault
- Faculty of Medicine, Université Laval , Quebec City, Quebec , Canada
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
| | - Nadia Milad
- Faculty of Medicine, Université Laval , Quebec City, Quebec , Canada
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
| | - Maude Talbot
- Faculty of Medicine, Université Laval , Quebec City, Quebec , Canada
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
| | - Marie-Josée Beaulieu
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
| | - Sophie Aubin
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
| | - Marie-Ève Paré
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
| | - Mathieu Laplante
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
- Department of Medicine, Université Laval , Quebec City, Quebec , Canada
- Centre de Recherche sur le Cancer de l'Université Laval, Quebec City, Quebec, Canada
| | - Mathieu C Morissette
- Quebec Heart and Lung Institute, Université Laval , Quebec City, Quebec , Canada
- Department of Medicine, Université Laval , Quebec City, Quebec , Canada
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Tehrani AY, White Z, Milad N, Breemen C, Esfandiarei M, Bernatchez P. Inhibition of Marfan‐associated Aortic Root Dilation by Angiotensin II Receptor Blockers May Be Independent of Blood Pressure Lowering. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.679.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Arash Y Tehrani
- Department of Anesthesiology, Pharmacology & TherapeuticsCentre for Heart Lung Innovation, University of British ColumbiaVancouverBCCanada
| | - Zoe White
- Department of Anesthesiology, Pharmacology & TherapeuticsCentre for Heart Lung Innovation, University of British ColumbiaVancouverBCCanada
| | - Nadia Milad
- Department of Anesthesiology, Pharmacology & TherapeuticsCentre for Heart Lung Innovation, University of British ColumbiaVancouverBCCanada
| | - Casey Breemen
- Department of Anesthesiology, Pharmacology & TherapeuticsBC Children Hospital Research Institute, University of British ColumbiaVancouverBCCanada
| | - Mitra Esfandiarei
- Department of Anesthesiology, Pharmacology & TherapeuticsBC Children Hospital Research Institute, University of British ColumbiaVancouverBCCanada
- Department of Biomedical SciencesCollege of Graduate Studies, Midwestern UniversityGlendaleAZ
| | - Pascal Bernatchez
- Department of Anesthesiology, Pharmacology & TherapeuticsCentre for Heart Lung Innovation, University of British ColumbiaVancouverBCCanada
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24
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White Z, Milad N, Tehrani A, Sellers S, Bernatchez PN. Statins, Cholesterol and Muscle Damage: an Illusion? ATHEROSCLEROSIS SUPP 2018. [DOI: 10.1016/j.atherosclerosissup.2018.04.170] [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: 10/14/2022]
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Sellers SL, Milad N, White Z, Pascoe C, Chan R, Payne GW, Seow C, Rossi F, Seidman MA, Bernatchez P. Increased nonHDL cholesterol levels cause muscle wasting and ambulatory dysfunction in the mouse model of LGMD2B. J Lipid Res 2017; 59:261-272. [PMID: 29175948 DOI: 10.1194/jlr.m079459] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [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: 07/28/2017] [Revised: 10/19/2017] [Indexed: 12/22/2022] Open
Abstract
Progressive limb and girdle muscle atrophy leading to loss of ambulation is a hallmark of dysferlinopathies, which include limb-girdle muscular dystrophy type 2B and Miyoshi myopathy. However, animal models fail to fully reproduce the disease severity observed in humans, with dysferlin-null (Dysf-/-) mice exhibiting minor muscle damage and weakness without dramatic ambulatory dysfunction. As we have previously reported significant Dysf expression in blood vessels, we investigated the role of vascular function in development of muscle pathology by generating a Dysf-deficient mouse model with vascular disease. This was achieved by crossing Dysf-/- mice with ApoE-/- mice, which have high levels of nonHDL-associated cholesterol. Double-knockout Dysf-/-ApoE-/- mice exhibited severe ambulatory dysfunction by 11 months of age. In limb-girdle muscles, histology confirmed dramatic muscle wasting, fibrofatty replacement, and myofiber damage in Dysf-/-ApoE-/- mice without affecting the ratio of centrally nucleated myofibers. Although there were no major changes in ex vivo diaphragm and soleus muscle function, histological analyses revealed these muscles to be untouched by damage and remodelling. In all, these data suggest that cholesterol may be deleterious to dysferlinopathic muscle and lead to ambulatory dysfunction. Moreover, differences in plasma lipid handling between mice and humans could be a key factor affecting dysferlinopathy severity.
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Affiliation(s)
- Stephanie L Sellers
- Department of Anesthesiology, Pharmacology & Therapeutics and UBC Centre for Heart Lung Innovation, University of British Columbia, Vancouver, Canada.,St. Paul's Hospital, University of British Columbia, Vancouver, Canada
| | - Nadia Milad
- Department of Anesthesiology, Pharmacology & Therapeutics and UBC Centre for Heart Lung Innovation, University of British Columbia, Vancouver, Canada.,St. Paul's Hospital, University of British Columbia, Vancouver, Canada
| | - Zoe White
- Department of Anesthesiology, Pharmacology & Therapeutics and UBC Centre for Heart Lung Innovation, University of British Columbia, Vancouver, Canada.,St. Paul's Hospital, University of British Columbia, Vancouver, Canada
| | - Chris Pascoe
- St. Paul's Hospital, University of British Columbia, Vancouver, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada
| | - Rayleigh Chan
- Department of Anesthesiology, Pharmacology & Therapeutics and UBC Centre for Heart Lung Innovation, University of British Columbia, Vancouver, Canada.,St. Paul's Hospital, University of British Columbia, Vancouver, Canada
| | - Geoffrey W Payne
- Providence Health Care, University of Northern British Columbia, Prince George, Canada
| | - Chun Seow
- Department of Anesthesiology, Pharmacology & Therapeutics and UBC Centre for Heart Lung Innovation, University of British Columbia, Vancouver, Canada.,St. Paul's Hospital, University of British Columbia, Vancouver, Canada
| | - Fabio Rossi
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada.,Biomedical Research Centre, University of British Columbia, Vancouver, Canada.,Department of Medical Genetics, University of British Columbia, Vancouver, Canada
| | - Michael A Seidman
- St. Paul's Hospital, University of British Columbia, Vancouver, Canada.,Department of Pathology, Prince George, Canada
| | - Pascal Bernatchez
- Department of Anesthesiology, Pharmacology & Therapeutics and UBC Centre for Heart Lung Innovation, University of British Columbia, Vancouver, Canada .,St. Paul's Hospital, University of British Columbia, Vancouver, Canada
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Milad N, White Z, Tehrani AY, Sellers S, Rossi FMV, Bernatchez P. Increased plasma lipid levels exacerbate muscle pathology in the mdx mouse model of Duchenne muscular dystrophy. Skelet Muscle 2017; 7:19. [PMID: 28899419 PMCID: PMC5596936 DOI: 10.1186/s13395-017-0135-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [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: 04/07/2017] [Accepted: 07/28/2017] [Indexed: 01/11/2023] Open
Abstract
Background Duchenne muscular dystrophy (DMD) is caused by loss of dystrophin expression and leads to severe ambulatory and cardiac function decline. However, the dystrophin-deficient mdx murine model of DMD only develops a very mild form of the disease. Our group and others have shown vascular abnormalities in animal models of MD, a likely consequence of the fact that blood vessels express the same dystrophin-associated glycoprotein complex (DGC) proteins as skeletal muscles. Methods To test the blood vessel contribution to muscle damage in DMD, mdx4cv mice were given elevated lipid levels via apolipoprotein E (ApoE) gene knockout combined with normal chow or lipid-rich Western diets. Ambulatory function and heart function (via echocardiogram) were assessed at 4 and 7 months of age. After sacrifice, muscle histology and aortic staining were used to assess muscle pathology and atherosclerosis development, respectively. Plasma levels of total cholesterol, high-density lipoprotein (HDL), triglycerides, and creatine kinase (CK) were also measured. Results Although there was an increase in left ventricular heart volume in mdx-ApoE mice compared to that in mdx mice, parameters of heart function were not affected. Compared with wild-type and ApoE-null, only mdx-ApoE KO mice showed significant ambulatory dysfunction. Despite no significant difference in plasma CK, histological analyses revealed that elevated plasma lipids in chow- and Western diet-fed mdx-ApoE mice was associated with severe exacerbation of muscle pathology compared to mdx mice: significant increase in myofiber damage and fibrofatty replacement in the gastrocnemius and triceps brachii muscles, more reminiscent of human DMD pathology. Finally, although both ApoE and mdx-ApoE groups displayed increased plasma lipids, mdx-ApoE exhibited atherosclerotic plaque deposition equal to or less than that of ApoE mice. Conclusions Since others have shown that lipid abnormalities correlate with DMD severity, our data suggest that plasma lipids could be primary contributors to human DMD severity and that the notoriously mild phenotype of mdx mice might be attributable in part to their endogenously low plasma lipid profiles. Hence, DMD patients may benefit from lipid-lowering and vascular-targeted therapies. Electronic supplementary material The online version of this article (10.1186/s13395-017-0135-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Nadia Milad
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada.,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada
| | - Zoe White
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada.,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada
| | - Arash Y Tehrani
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada.,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada
| | - Stephanie Sellers
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada.,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada
| | - Fabio M V Rossi
- Department of Medical Genetics, Centre for Biomedical Research, University of British Columbia, 2222 Health Sciences Mall, Vancouver, British Columbia, Canada
| | - Pascal Bernatchez
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada. .,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada.
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