1
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Zimmermann R, Roeder F, Ruppert C, Smith BJ, Knudsen L. Low-volume ventilation of preinjured lungs degrades lung function via stress concentration and progressive alveolar collapse. Am J Physiol Lung Cell Mol Physiol 2024; 327:L19-L39. [PMID: 38712429 DOI: 10.1152/ajplung.00323.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 03/27/2024] [Accepted: 04/22/2024] [Indexed: 05/08/2024] Open
Abstract
Mechanical ventilation can cause ventilation-induced lung injury (VILI). The concept of stress concentrations suggests that surfactant dysfunction-induced microatelectases might impose injurious stresses on adjacent, open alveoli and function as germinal centers for injury propagation. The aim of the present study was to quantify the histopathological pattern of VILI progression and to test the hypothesis that injury progresses at the interface between microatelectases and ventilated lung parenchyma during low-positive end-expiratory pressure (PEEP) ventilation. Bleomycin was used to induce lung injury with microatelectases in rats. Lungs were then mechanically ventilated for up to 6 h at PEEP = 1 cmH2O and compared with bleomycin-treated group ventilated protectively with PEEP = 5 cmH2O to minimize microatelectases. Lung mechanics were measured during ventilation. Afterward, lungs were fixed at end-inspiration or end-expiration for design-based stereology. Before VILI, bleomycin challenge reduced the number of open alveoli [N(alvair,par)] by 29%. No differences between end-inspiration and end-expiration were observed. Collapsed alveoli clustered in areas with a radius of up to 56 µm. After PEEP = 5 cmH2O ventilation for 6 h, N(alvair,par) remained stable while PEEP = 1 cmH2O ventilation led to an additional loss of aerated alveoli by 26%, mainly due to collapse, with a small fraction partly edema filled. Alveolar loss strongly correlated to worsening of tissue elastance, quasistatic compliance, and inspiratory capacity. The radius of areas of collapsed alveoli increased to 94 µm, suggesting growth of the microatelectases. These data provide evidence that alveoli become unstable in neighborhood of microatelectases, which most likely occurs due to stress concentration-induced local vascular leak and surfactant dysfunction.NEW & NOTEWORTHY Low-volume mechanical ventilation in the presence of high surface tension-induced microatelectases leads to the degradation of lung mechanical function via the progressive loss of alveoli. Microatelectases grow at the interfaces of collapsed and open alveoli. Here, stress concentrations might cause injury and alveolar instability. Accumulation of small amounts of alveolar edema can be found in a fraction of partly collapsed alveoli but, in this model, alveolar flooding is not a major driver for degradation of lung mechanics.
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Affiliation(s)
- Richard Zimmermann
- Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany
| | - Franziska Roeder
- Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany
| | - Clemens Ruppert
- Department of Internal Medicine, Justus-Liebig-University Giessen, Giessen, Germany
- University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Bradford J Smith
- Department of Bioengineering, College of Engineering, Design & Computing, University of Colorado Denver | Anschutz Medical Campus, Aurora, Colorado, United States
- Section of Pulmonary and Sleep Medicine, Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, Aurora, Colorado, United States
| | - Lars Knudsen
- Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Hannover Medical School, Hannover, Germany
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2
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Nataliya B, Mikhail A, Vladimir P, Olga G, Maksim V, Ivan Z, Ekaterina N, Georgy S, Natalia D, Pavel M, Andrey C, Maria S, Maxim K, Anastasiya T, Uliana D, Zhanna A, Vsevolod T, Natalia K, Anastasiya E. Mesenchymal stromal cells facilitate resolution of pulmonary fibrosis by miR-29c and miR-129 intercellular transfer. Exp Mol Med 2023:10.1038/s12276-023-01017-w. [PMID: 37394579 PMCID: PMC10393964 DOI: 10.1038/s12276-023-01017-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 03/14/2023] [Accepted: 03/26/2023] [Indexed: 07/04/2023] Open
Abstract
To date, pulmonary fibrosis remains an unmet medical need. In this study, we evaluated the potency of mesenchymal stromal cell (MSC) secretome components to prevent pulmonary fibrosis development and facilitate fibrosis resolution. Surprisingly, the intratracheal application of extracellular vesicles (MSC-EVs) or the vesicle-depleted secretome fraction (MSC-SF) was not able to prevent lung fibrosis when applied immediately after the injury caused by bleomycin instillation in mice. However, MSC-EV administration induced the resolution of established pulmonary fibrosis, whereas the vesicle-depleted fraction did not. The application of MSC-EVs caused a decrease in the numbers of myofibroblasts and FAPa+ progenitors without affecting their apoptosis. Such a decrease likely occurred due to their dedifferentiation caused by microRNA (miR) transfer by MSC-EVs. Using a murine model of bleomycin-induced pulmonary fibrosis, we confirmed the contribution of specific miRs (miR-29c and miR-129) to the antifibrotic effect of MSC-EVs. Our study provides novel insights into possible antifibrotic therapy based on the use of the vesicle-enriched fraction of the MSC secretome.
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Affiliation(s)
- Basalova Nataliya
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation.
| | - Arbatskiy Mikhail
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Popov Vladimir
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Grigorieva Olga
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Vigovskiy Maksim
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Zaytsev Ivan
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Novoseletskaya Ekaterina
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Sagaradze Georgy
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Danilova Natalia
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
- Department of Clinical Pathology, Medical Research and Education Centre, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Malkov Pavel
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
- Department of Clinical Pathology, Medical Research and Education Centre, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Cherniaev Andrey
- Division of Fundamental Medicine of Federal State Budgetary Institution "Pulmonology Scientific Research Institute under Federal Medical and Biological Agency of Russian Federation", Moscow, Russian Federation
- Research Institute of Human Morphology, Moscow, Russian Federation
| | - Samsonova Maria
- Division of Fundamental Medicine of Federal State Budgetary Institution "Pulmonology Scientific Research Institute under Federal Medical and Biological Agency of Russian Federation", Moscow, Russian Federation
- Research Institute of Human Morphology, Moscow, Russian Federation
| | - Karagyaur Maxim
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Tolstoluzhinskaya Anastasiya
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Dyachkova Uliana
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Akopyan Zhanna
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Tkachuk Vsevolod
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Kalinina Natalia
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Efimenko Anastasiya
- Institute for Regenerative Medicine, Medical Research and Education Center, Lomonosov Moscow State University, Moscow, Russian Federation
- Faculty of Medicine, Lomonosov Moscow State University, Moscow, Russian Federation
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3
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Hong SY, Lu YT, Chen SY, Hsu CF, Lu YC, Wang CY, Huang KL. Targeting pathogenic macrophages by the application of SHP-1 agonists reduces inflammation and alleviates pulmonary fibrosis. Cell Death Dis 2023; 14:352. [PMID: 37291088 PMCID: PMC10249559 DOI: 10.1038/s41419-023-05876-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 05/07/2023] [Accepted: 05/31/2023] [Indexed: 06/10/2023]
Abstract
Idiopathic pulmonary fibrosis is a progressive fibrotic disorder with no cure that is characterized by deterioration of lung function. Current FDA-approved drugs for IPF delay the decline in lung function, but neither reverse fibrosis nor significantly improve overall survival. SHP-1 deficiency results in hyperactive alveolar macrophages accumulating in the lung, which contribute to the induction of pulmonary fibrosis. Herein, we investigated whether employing a SHP-1 agonist ameliorates pulmonary fibrosis in a bleomycin-induced pulmonary fibrosis murine model. Histological examination and micro-computed tomography images showed that SHP-1 agonist treatment alleviates bleomycin-induced pulmonary fibrosis. Reduced alveolar hemorrhage, lung inflammation, and collagen deposition, as well as enhanced alveolar space, lung capacity, and improved overall survival were observed in mice administered the SHP-1 agonist. The percentage of macrophages collected from bronchoalveolar lavage fluid and circulating monocytes in bleomycin-instilled mice were also significantly reduced by SHP-1 agonist treatment, suggesting that the SHP-1 agonist may alleviate pulmonary fibrosis by targeting macrophages and reshaping the immunofibrotic niche. In human monocyte-derived macrophages, SHP-1 agonist treatment downregulated CSF1R expression and inactivated STAT3/NFκB signaling, culminating in inhibited macrophage survival and perturbed macrophage polarization. The expression of pro-fibrotic markers (e.g., MRC1, CD200R1, and FN1) by IL4/IL13-induced M2 macrophages that rely on CSF1R signaling for their fate-determination was restricted by SHP-1 agonist treatment. While M2-derived medium promoted the expression of fibroblast-to-myofibroblast transition markers (e.g., ACTA2 and COL3A1), the application of SHP-1 agonist reversed the transition in a dose-dependent manner. Our report indicates that pharmacological activation of SHP-1 ameliorates pulmonary fibrosis via suppression of CSF1R signaling in macrophages, reduction of pathogenic macrophages, and the inhibition of fibroblast-to-myofibroblast transition. Our study thus identifies SHP-1 as a druggable target for the treatment of IPF, and suggests that the SHP-1 agonist may be developed as an anti-pulmonary fibrosis medication that both suppresses inflammation and restrains fibroblast-to-myofibroblast transition.
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Affiliation(s)
- Shiao-Ya Hong
- Department of Biotechnology and Laboratory Science in Medicine, National Yang Ming Chiao Tung University, Taipei, 11221, Taiwan
- Medical Research Center, Cardinal Tien Hospital, New Taipei, 23148, Taiwan
| | - Ya-Ting Lu
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Shih-Yu Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Chiung-Fang Hsu
- Department of Biotechnology and Laboratory Science in Medicine, National Yang Ming Chiao Tung University, Taipei, 11221, Taiwan
- Medical Research Center, Cardinal Tien Hospital, New Taipei, 23148, Taiwan
| | - Yi-Chun Lu
- Medical Research Center, Cardinal Tien Hospital, New Taipei, 23148, Taiwan
| | - Cheng-Yi Wang
- Department of Internal Medicine, Cardinal Tien Hospital and School of Medicine, College of Medicine, Fu Jen Catholic University, New Taipei, 23148, Taiwan.
| | - Kun-Lun Huang
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, 11490, Taiwan.
- Division of Pulmonary and Critical Care Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, 11490, Taiwan.
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4
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Bouch S, Litvack ML, Litman K, Luo L, Post A, Williston E, Park AJ, Roach EJ, Berezuk AM, Khursigara CM, Post M. Therapeutic stem cell-derived alveolar-like macrophages display bactericidal effects and resolve Pseudomonas aeruginosa-induced lung injury. J Cell Mol Med 2022; 26:3046-3059. [PMID: 35441437 PMCID: PMC9097833 DOI: 10.1111/jcmm.17324] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 12/24/2021] [Accepted: 01/28/2022] [Indexed: 01/19/2023] Open
Abstract
Bacterial lung infections lead to greater than 4 million deaths per year with antibiotic treatments driving an increase in antibiotic resistance and a need to establish new therapeutic approaches. Recently, we have generated mouse and rat stem cell‐derived alveolar‐like macrophages (ALMs), which like primary alveolar macrophages (1'AMs), phagocytose bacteria and promote airway repair. Our aim was to further characterize ALMs and determine their bactericidal capabilities. The characterization of ALMs showed that they share known 1'AM cell surface markers, but unlike 1'AMs are highly proliferative in vitro. ALMs effectively phagocytose and kill laboratory strains of P. aeruginosa (P.A.), E. coli (E.C.) and S. aureus, and clinical strains of P.A. In vivo, ALMs remain viable, adapt additional features of native 1'AMs, but proliferation is reduced. Mouse ALMs phagocytose P.A. and E.C. and rat ALMs phagocytose and kill P.A. within the lung 24 h post‐instillation. In a pre‐clinical model of P.A.‐induced lung injury, rat ALM administration mitigated weight loss and resolved lung injury observed seven days post‐instillation. Collectively, ALMs attenuate pulmonary bacterial infections and promote airway repair. ALMs could be utilized as an alternative or adjuvant therapy where current treatments are ineffective against antibiotic‐resistant bacteria or to enhance routine antibiotic delivery.
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Affiliation(s)
- Sheena Bouch
- Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Michael L Litvack
- Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Kymberly Litman
- Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada.,Laboratory Medicine and Pathobiology, The University of Toronto, Toronto, Ontario, Canada
| | - Lisha Luo
- Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Alex Post
- Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Emma Williston
- Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Amber J Park
- Department of Molecular and Cellular Biology, The University of Guelph, Ontario, Canada
| | - Elyse J Roach
- Department of Molecular and Cellular Biology, The University of Guelph, Ontario, Canada
| | - Alison M Berezuk
- Department of Molecular and Cellular Biology, The University of Guelph, Ontario, Canada
| | - Cezar M Khursigara
- Department of Molecular and Cellular Biology, The University of Guelph, Ontario, Canada
| | - Martin Post
- Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada.,Laboratory Medicine and Pathobiology, The University of Toronto, Toronto, Ontario, Canada
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5
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Shen XB, Ding DL, Yu LZ, Ni JZ, Liu Y, Wang W, Liu LM, Nian SH. Total extract of Anemarrhenae Rhizoma attenuates bleomycin-induced pulmonary fibrosis in rats. Bioorg Chem 2021; 119:105546. [PMID: 34954573 DOI: 10.1016/j.bioorg.2021.105546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 11/23/2021] [Accepted: 12/05/2021] [Indexed: 11/02/2022]
Abstract
Pulmonary fibrosis is a progressive interstitial lung disease with poor prognosis. Anemarrhenae Rhizoma is a traditional Chinese herbal medicine and has been applied in clinical practice for a long history. Recently, components of Anemarrhenae Rhizoma were reported to possess anti-inflammatory and immunomodulatory features; however, the effect of them on pulmonary fibrosis remains unknown. In this study, we explored the therapeutic effect of total extract of Anemarrhenae Rhizoma (TEAR) on bleomycin-induced pulmonary fibrosis. Pulmonary fibrosis rat model was established by a single intratracheal instillation of bleomycin, three doses of TEAR were intragastrically administered for consecutive 28 days. Subsequent to sacrificing of rats, pulmonary fibrosis was observed in rats treated with bleomycin, but administration of TEAR attenuated lung fibrosis, as evidenced by the improved lung histopathological damage and decreased weight loss and lung index. Moreover, TEAR treatment inhibited the inflammatory response in lung fibrosis, which was shown by the reduced nitrogen oxide level and myeloperoxidase activity. Furthermore, TEAR modulated the redox balance in lung tissue by alleviated lipid peroxidation and enhanced enzymatic antioxidants activity. Meanwhile, TEAR protected the rats from fibrosis in a dose-dependent manner, and the anti-fibrotic activity of TEAR may be related to the modulation of TGF-β1/Smad signaling pathway. Collectively, TEAR alleviates bleomycin-induced pulmonary fibrosis, indicating perspectives for development of a potential agent for lung fibrosis therapy.
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Affiliation(s)
- Xue-Bin Shen
- School of Pharmacy, Wannan Medical College, Wuhu 241002, PR China
| | - Da-Li Ding
- School of Pharmacy, Wannan Medical College, Wuhu 241002, PR China
| | - Li-Zhen Yu
- School of Pharmacy, Wannan Medical College, Wuhu 241002, PR China
| | - Jin-Zhong Ni
- School of Basic Medical Sciences, Wannan Medical College, Wuhu 241002, PR China
| | - Yao Liu
- School of Pharmacy, Wannan Medical College, Wuhu 241002, PR China
| | - Wei Wang
- School of Pharmacy, Wannan Medical College, Wuhu 241002, PR China
| | - Li-Min Liu
- School of Pharmacy, Anhui College of Traditional Chinese Medicine, Wuhu 241003, PR China.
| | - Si-Hui Nian
- School of Pharmacy, Wannan Medical College, Wuhu 241002, PR China; Institute of Modern Chinese Medicine, Wannan Medical College, Wuhu 241002, PR China.
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6
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Guo P, Li B, Liu MM, Li YX, Weng GY, Gao Y. Protective effects of lotus plumule ethanol extracts on bleomycin-induced pulmonary fibrosis in mice. Drug Chem Toxicol 2021; 45:1432-1441. [PMID: 34724865 DOI: 10.1080/01480545.2021.1993670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Pulmonary fibrosis (PF) is a progressive fibrosing disease, characterized by excessive accumulation of extracellular matrix (ECM) and remodeling of the lung architecture, which finally result in respiratory failure. Currently, there is no satisfactory treatment for PF, therefore, the development of effective agents is urgently needed. Lotus plumule, the green embryo of Nelumbo nucifera Gaertn., a plant of the Nymphaeaceae family, is a traditional Chinese food with exceptional nutritional value and its extracts exert prominent anti-inflammatory and anti-fibrotic effects. The aim of the present study was to investigate the inhibitory effects of lotus plumule extracts (LPEs) on bleomycin (BLM)-induced PF in mice. Therefore, enzyme-linked immunosorbent assay, RT-PCR, and western blot analysis were performed. The histopathological examination demonstrated that LPEs could obviously decrease the degree of alveolitis, deposition of ECM and the production of collagen I (Col-I) in the pulmonary interstitium. In addition, the results showed that LPEs markedly alleviated the expression of interleukin (IL)-6, IL-17, transforming growth factor (TGF)-β, and α-smooth muscle actin (α-SMA). Additionally, the content of Col-I and hydroxyproline (HYP) was also attenuated. In conclusion, LPEs could ameliorate the BLM-induced lung fibrosis, thus suggesting that LPEs could serve as a potential therapeutic approach for PF.
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Affiliation(s)
- Peng Guo
- Department of Health Service, Logistics College of Chinese People's Armed Police Force, Tianjin, China
| | - Bin Li
- Specialized Medical Center of Chinese People's Armed Police Force, Tianjin, China
| | - Meng-Meng Liu
- Department of Health Service, Logistics College of Chinese People's Armed Police Force, Tianjin, China
| | - Yan-Xiao Li
- Department of Health Service, Logistics College of Chinese People's Armed Police Force, Tianjin, China
| | - Gong-Yu Weng
- Department of Health Service, Logistics College of Chinese People's Armed Police Force, Tianjin, China
| | - Ying Gao
- Department of Health Service, Logistics College of Chinese People's Armed Police Force, Tianjin, China
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7
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Kawami M, Takenaka S, Kadekaru Y, Akai M, Konaka T, Yumoto R, Takano M. Evaluation on epithelial-mesenchymal state and microRNAs focusing on isolated alveolar epithelial cells from bleomycin injured rat lung. Toxicology 2021; 461:152903. [PMID: 34425168 DOI: 10.1016/j.tox.2021.152903] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 08/18/2021] [Accepted: 08/19/2021] [Indexed: 02/06/2023]
Abstract
Several studies using bleomycin (BLM)-induced lung injury rat model revealed that epithelial-mesenchymal transition (EMT) contributes to pulmonary fibrosis. Conversely, microRNAs (miRNAs) are considered as useful markers of various diseases. In the present study, we aimed to characterize the EMT state through focusing on alveolar epithelial cells and identify the miRNAs that can be used as markers to predict pulmonary fibrosis using a BLM-induced lung injury rat model. Intratracheal administration of BLM increased hydroxyproline, a component of collagen, in lung tissues at day 14, but not at day 7. However, BLM induced EMT at day 7, which was accompanied with increased mRNA expression of α-smooth muscle actin, a representative EMT marker, in alveolar epithelium, thereby suggesting that EMT occurs prior to pulmonary fibrosis in alveolar epithelial cells. Using this rat model, the expression levels of several EMT-associated miRNAs were examined, and miR-222 was found to be upregulated in alveolar epithelial cells as well as bronchoalveolar lavage fluid from day 3. Our findings indicate that EMT in alveolar epithelial cells may occur before pulmonary fibrosis, and miR-222 may be used as a potential marker for early prediction of pulmonary fibrosis.
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Affiliation(s)
- Masashi Kawami
- Department of Pharmaceutics and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
| | - Shinnosuke Takenaka
- Department of Pharmaceutics and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Yuri Kadekaru
- Department of Pharmaceutics and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Mizuki Akai
- Department of Pharmaceutics and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Takashi Konaka
- Department of Pharmaceutics and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Ryoko Yumoto
- Department of Pharmaceutics and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Mikihisa Takano
- Department of Pharmaceutics and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
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8
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Balzer C, Cleveland WJ, Jinka TR, Riess ML. Video laryngoscopic oral intubation in rats: a simple and effective method. Am J Physiol Lung Cell Mol Physiol 2020; 318:L1032-L1035. [PMID: 32233786 DOI: 10.1152/ajplung.00498.2019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Endotracheal intubation is a vital component of many rat in vivo experiments to secure the airway and allow controlled ventilation. Even in the hands of experienced researchers, however, the procedure remains technically challenging. The safest and most reliable way for human intubation is by video laryngoscopy. Previous attempts to apply this technique in rodents have been complicated and expensive. We, hereby, describe a novel, noninvasive method to safely intubate rats orally by video laryngoscopy, thus avoiding the need for a surgical tracheostomy. By repurposing a commercially available ear wax removal device, visualization of the rat larynx can be significantly enhanced. Because of its small diameter, integrated illumination, and a powerful camera with adequate focal length, the device has all of the necessary properties for exploring the upper airway of a rat. After identifying the vocal cords by video laryngoscopy, the insertion of an endotracheal tube (a 14G intravenous catheter) into the trachea under constant visual control is facilitated by using PE50 polyethylene tubing as a stylet (Seldinger technique). The procedure has been performed more than 60 times in our laboratory; all intubations were successful on the first attempt, and no adverse events were observed. We conclude that the described procedure is a simple and effective way to intubate a rat noninvasively, using inexpensive and commercially available equipment.
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Affiliation(s)
- Claudius Balzer
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - William J Cleveland
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Tulasi R Jinka
- Department of Emergency Medicine, University of Michigan Medical School, Ann Arbor, Michigan.,Michigan Center for Integrative Research in Critical Care, University of Michigan, Ann Arbor, Michigan
| | - Matthias L Riess
- Department of Anesthesiology, Tennessee Valley Healthcare System Veterans Affairs Medical Center, Vanderbilt University, Nashville, Tennessee.,Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, Tennessee.,Department of Pharmacology, Vanderbilt University, Nashville, Tennessee
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