1
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Diesler R, Legendre M, Si-Mohamed S, Brillet PY, Wemeau L, Manali ED, Gagnadoux F, Hirschi S, Lorillon G, Reynaud-Gaubert M, Bironneau V, Blanchard E, Bourdin A, Dominique S, Justet A, Macey J, Marchand-Adam S, Morisse-Pradier H, Nunes H, Papiris SA, Traclet J, Traore I, Crestani B, Amselem S, Nathan N, Borie R, Cottin V. Similarities and differences of interstitial lung disease associated with pathogenic variants in SFTPC and ABCA3 in adults. Respirology 2024; 29:312-323. [PMID: 38345107 DOI: 10.1111/resp.14667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Accepted: 01/21/2024] [Indexed: 03/19/2024]
Abstract
BACKGROUND AND OBJECTIVE Variants in surfactant genes SFTPC or ABCA3 are responsible for interstitial lung disease (ILD) in children and adults, with few studies in adults. METHODS We conducted a multicentre retrospective study of all consecutive adult patients diagnosed with ILD associated with variants in SFTPC or ABCA3 in the French rare pulmonary diseases network, OrphaLung. Variants and chest computed tomography (CT) features were centrally reviewed. RESULTS We included 36 patients (median age: 34 years, 20 males), 22 in the SFTPC group and 14 in the ABCA3 group. Clinical characteristics were similar between groups. Baseline median FVC was 59% ([52-72]) and DLco was 44% ([35-50]). An unclassifiable pattern of fibrosing ILD was the most frequent on chest CT, found in 85% of patients, however with a distinct phenotype with ground-glass opacities and/or cysts. Nonspecific interstitial pneumonia and usual interstitial pneumonia were the most common histological patterns in the ABCA3 group and in the SFTPC group, respectively. Annually, FVC and DLCO declined by 1.87% and 2.43% in the SFTPC group, respectively, and by 0.72% and 0.95% in the ABCA3 group, respectively (FVC, p = 0.014 and DLCO , p = 0.004 for comparison between groups). Median time to death or lung transplantation was 10 years in the SFTPC group and was not reached at the end of follow-up in the ABCA3 group. CONCLUSION SFTPC and ABCA3-associated ILD present with a distinct phenotype and prognosis. A radiologic pattern of fibrosing ILD with ground-glass opacities and/or cysts is frequently found in these rare conditions.
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Affiliation(s)
- Rémi Diesler
- Department of Respiratory Medicine, National Reference Centre for Rare Pulmonary Diseases, Hospices civils de Lyon, Université Lyon 1, UMR754, INRAE, ERN-LUNG, Lyon, France
| | - Marie Legendre
- U.F. de Génétique moléculaire, Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Hôpital Armand Trousseau, Paris, France
- Childhood Genetic Diseases, UMR_S933, Inserm, Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Hôpital Armand Trousseau, Paris, France
| | - Salim Si-Mohamed
- Department of Thoracic Imaging, Louis Pradel Hospital, Hospices Civils de Lyon, Claude Bernard University Lyon 1, INSA-Lyon, UJM-Saint-Étienne, CNRS, Inserm, CREATIS UMR 5220, Lyon, France
| | - Pierre-Yves Brillet
- Service de Radiologie, Assistance Publique-Hôpitaux de Paris, Hôpital Avicenne, Bobigny, France
| | - Lidwine Wemeau
- CHU Lille, Service de Pneumologie et Immuno-Allergologie, Centre de Référence Constitutif des Maladies Pulmonaires Rares, Hôpital Calmette, Lille, France
| | - Effrosyni D Manali
- 2nd Pulmonary Medicine Department, General University Hospital "Attikon," Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Frédéric Gagnadoux
- Service de Pneumologie et Allergologie, Centre Hospitalier Universitaire d'Angers, Angers, France
| | - Sandrine Hirschi
- Service de Pneumologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Gwenaël Lorillon
- National Reference Centre for Histiocytoses, Pulmonary Department, Assistance Publique-Hôpitaux de Paris, Hôpital Saint-Louis, Paris, France
| | - Martine Reynaud-Gaubert
- Service de Pneumologie, Équipe de Transplantation Pulmonaire, Centre de Compétence des Maladies Pulmonaires Rares, Aix-Marseille Université, Assistance Publique-Hôpitaux de Marseille, CHU Nord, Marseille, France
| | - Vanessa Bironneau
- Service de Pneumologie CHU de Poitiers, INSERM CIC 1402, IS-ALIVE Research Group, Université de Poitiers, UFR Médecine et Pharmacie, Poitiers, France
| | - Elodie Blanchard
- Service de Pneumologie, Hôpital Haut Lévêque, CHU de Bordeaux, Bordeaux, France
| | - Arnaud Bourdin
- Department of Respiratory Diseases and PhyMedExp, Centre National de la Recherche Scientifique, INSERM, University of Montpellier, CHU Montpellier, Montpellier, France
| | | | - Aurélien Justet
- Service de Pneumologie, CHU de Caen, Centre de compétence des maladies pulmonaires rares, ISTCT, UMR6030-CNRS-CEA-Université de Caen, Caen, France
| | - Julie Macey
- Respiratory Medicine and Cystic Fibrosis Center, University Hospital Center of Bordeaux, Bordeaux, France
| | - Sylvain Marchand-Adam
- Service de Pneumologie et Explorations Fonctionnelles Respiratoires, CHU Tours, Université François Rabelais, Tours, France
| | | | - Hilario Nunes
- Service de Pneumologie et Oncologie Thoracique, Centre Constitutif Maladies Pulmonaires Rares de l'Adulte, Assistance Publique-Hôpitaux de Paris, Hôpital Avicenne, Paris, France
| | - Spyros A Papiris
- 2nd Pulmonary Medicine Department, General University Hospital "Attikon," Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Julie Traclet
- Department of Respiratory Medicine, National Reference Centre for Rare Pulmonary Diseases, Hospices civils de Lyon, Université Lyon 1, Lyon, France
| | - Ibrahim Traore
- Service de Pneumologie, CHU Jean Minjoz, Besançon, France
| | - Bruno Crestani
- Service de Pneumologie, Assistance Publique-Hôpitaux de Paris, Hôpital Bichat, Paris, France
| | - Serge Amselem
- U.F. de Génétique moléculaire, Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Hôpital Armand Trousseau, Paris, France
- Childhood Genetic Diseases, UMR_S933, Inserm, Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Hôpital Armand Trousseau, Paris, France
| | - Nadia Nathan
- Childhood Genetic Diseases, UMR_S933, Inserm, Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Hôpital Armand Trousseau, Paris, France
- Pediatric Pulmonology Department and Reference Center for Rare Lung Diseases and Laboratory of Childhood Genetic Diseases Inserm UMR_S933, Assistance Publique-Hôpitaux de Paris, Sorbonne University, Armand Trousseau Hospital, Paris, France
| | - Raphaël Borie
- Université Paris Cité, INSERM U1152, Laboratoire D'Excellence Inflamex, Assistance Publique-Hôpitaux de Paris, Service de Pneumologie A, Centre de Référence Constitutif des Maladies Pulmonaires Rares, Fédération Hospitalo-Universitaire Apollo, Hôpital Bichat, Paris, France
| | - Vincent Cottin
- Department of Respiratory Medicine, National Reference Centre for Rare Pulmonary Diseases, Hospices civils de Lyon, Université Lyon 1, UMR754, INRAE, ERN-LUNG, Lyon, France
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Sun YL, Hennessey EE, Heins H, Yang P, Villacorta-Martin C, Kwan J, Gopalan K, James M, Emili A, Cole FS, Wambach JA, Kotton DN. Human pluripotent stem cell modeling of alveolar type 2 cell dysfunction caused by ABCA3 mutations. J Clin Invest 2024; 134:e164274. [PMID: 38226623 PMCID: PMC10786693 DOI: 10.1172/jci164274] [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: 08/08/2022] [Accepted: 11/14/2023] [Indexed: 01/17/2024] Open
Abstract
Mutations in ATP-binding cassette A3 (ABCA3), a phospholipid transporter critical for surfactant homeostasis in pulmonary alveolar type II epithelial cells (AEC2s), are the most common genetic causes of childhood interstitial lung disease (chILD). Treatments for patients with pathological variants of ABCA3 mutations are limited, in part due to a lack of understanding of disease pathogenesis resulting from an inability to access primary AEC2s from affected children. Here, we report the generation of AEC2s from affected patient induced pluripotent stem cells (iPSCs) carrying homozygous versions of multiple ABCA3 mutations. We generated syngeneic CRISPR/Cas9 gene-corrected and uncorrected iPSCs and ABCA3-mutant knockin ABCA3:GFP fusion reporter lines for in vitro disease modeling. We observed an expected decreased capacity for surfactant secretion in ABCA3-mutant iPSC-derived AEC2s (iAEC2s), but we also found an unexpected epithelial-intrinsic aberrant phenotype in mutant iAEC2s, presenting as diminished progenitor potential, increased NFκB signaling, and the production of pro-inflammatory cytokines. The ABCA3:GFP fusion reporter permitted mutant-specific, quantifiable characterization of lamellar body size and ABCA3 protein trafficking, functional features that are perturbed depending on ABCA3 mutation type. Our disease model provides a platform for understanding ABCA3 mutation-mediated mechanisms of alveolar epithelial cell dysfunction that may trigger chILD pathogenesis.
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Affiliation(s)
- Yuliang L. Sun
- Center for Regenerative Medicine of Boston University and Boston Medical Center, Boston, Massachusetts, USA
- The Pulmonary Center and Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Erin E. Hennessey
- Center for Regenerative Medicine of Boston University and Boston Medical Center, Boston, Massachusetts, USA
- The Pulmonary Center and Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Hillary Heins
- Division of Newborn Medicine, Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, Missouri, USA
| | - Ping Yang
- Division of Newborn Medicine, Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, Missouri, USA
| | - Carlos Villacorta-Martin
- Center for Regenerative Medicine of Boston University and Boston Medical Center, Boston, Massachusetts, USA
| | - Julian Kwan
- Departments of Biology and Biochemistry, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Krithi Gopalan
- University of Massachusetts Chan Medical School, Worcester, Massachusetts, USA
| | - Marianne James
- Center for Regenerative Medicine of Boston University and Boston Medical Center, Boston, Massachusetts, USA
| | - Andrew Emili
- Departments of Biology and Biochemistry, Boston University School of Medicine, Boston, Massachusetts, USA
| | - F. Sessions Cole
- Division of Newborn Medicine, Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, Missouri, USA
| | - Jennifer A. Wambach
- Division of Newborn Medicine, Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, Missouri, USA
| | - Darrell N. Kotton
- Center for Regenerative Medicine of Boston University and Boston Medical Center, Boston, Massachusetts, USA
- The Pulmonary Center and Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
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3
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Bush A. Learning from cystic fibrosis: How can we start to personalise treatment of Children's Interstitial Lung Disease (chILD)? Paediatr Respir Rev 2023:S1526-0542(23)00078-7. [PMID: 37996258 DOI: 10.1016/j.prrv.2023.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 11/17/2023] [Indexed: 11/25/2023]
Abstract
Cystic fibrosis (CF) is a monogenic disorder cause by mutations in the CF Transmembrane Regulator (CFTR) gene. The prognosis of cystic fibrosis has been transformed by the discovery of highly effective modulator therapies (HEMT). Treatment has changed from reactive therapy dealing with complications of the disease to pro-active correction of the underlying molecular functional abnormality. This has come about by discovering the detailed biology of the different CF molecular sub-endotypes; the development of biomarkers to assess response even in mild disease or young children; the performance of definitive large randomised controlled trials in patients with a common mutation and the development of in vitro testing systems to test efficacy in those patients with rare CFTR mutations. As a result, CF is now an umbrella term, rather than a specific diagnostic label; we have moved from clinical phenotypes to molecular subendotypes. Children's Interstitial Lung Diseases (chILDs) comprise more than 200 entities, and are a diverse group of diseases, for an increasing number of which an underlying gene mutation has been discovered. Many of these entities are umbrella terms, such as pulmonary alveolar proteinosis or hypersensitivity pneumonitis, for each of which there are multiple and very different endotypes. Even those chILDs for which a specific gene mutation has been discovered comprise, as with CF, different molecular subendotypes likely mandating different therapies. For most chILDs, current treatment is non-specific (corticosteroids, azithromycin, hydroxychloroquine). The variability of the different entities means that there is little evidence for the efficacy of any treatment. This review considers how some of the lessons of the success story of CF are being applied to chILD, thus opening the opportunities for truly personalised medicine in these conditions. Advances in knowledge in the molecular biology of surfactant protein C and Adenosine triphosphate binding cassette subfamily A member 3 (ABCA3), and the possibilities of discovering novel therapies by in vitro studies will especially be highlighted.
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Affiliation(s)
- Andrew Bush
- National Heart and Lung Institute, Imperial College, and Imperial Centre for Paediatrics and Child Health, Consultant Paediatric Chest Physician, Royal Brompton Hospital, UK.
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4
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Hosokawa M, Mikawa R, Hagiwara A, Okuno Y, Awaya T, Yamamoto Y, Takahashi S, Yamaki H, Osawa M, Setoguchi Y, Saito MK, Abe S, Hirai T, Gotoh S, Hagiwara M. Cryptotanshinone is a candidate therapeutic agent for interstitial lung disease associated with a BRICHOS-domain mutation of SFTPC. iScience 2023; 26:107731. [PMID: 37701577 PMCID: PMC10494175 DOI: 10.1016/j.isci.2023.107731] [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: 12/19/2022] [Revised: 08/05/2023] [Accepted: 08/23/2023] [Indexed: 09/14/2023] Open
Abstract
Interstitial lung disease (ILD) represents a large group of diseases characterized by chronic inflammation and fibrosis of the lungs, for which therapeutic options are limited. Among several causative genes of familial ILD with autosomal dominant inheritance, the mutations in the BRICHOS domain of SFTPC cause protein accumulation and endoplasmic reticulum stress by misfolding its proprotein. Through a screening system using these two phenotypes in HEK293 cells and evaluation using alveolar epithelial type 2 (AT2) cells differentiated from patient-derived induced pluripotent stem cells (iPSCs), we identified Cryptotanshinone (CPT) as a potential therapeutic agent for ILD. CPT decreased cell death induced by mutant SFTPC overexpression in A549 and HEK293 cells and ameliorated the bleomycin-induced contraction of the matrix in fibroblast-dependent alveolar organoids derived from iPSCs with SFTPC mutation. CPT and this screening strategy can apply to abnormal protein-folding-associated ILD and other protein-misfolding diseases.
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Affiliation(s)
- Motoyasu Hosokawa
- Department of Anatomy and Developmental Biology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
- Department of Developmental Biology and Functional Genomics, Ehime University Graduate School of Medicine, Toon, Ehime 791-0295, Japan
| | - Ryuta Mikawa
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
- Department of Drug Discovery for Lung Diseases, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
- Department of Clinical Application, Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto 606-8507, Japan
| | - Atsuko Hagiwara
- Department of Anatomy and Developmental Biology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Yukiko Okuno
- Medical Research Support Center, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Tomonari Awaya
- Department of Anatomy and Developmental Biology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yuki Yamamoto
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
- Department of Drug Discovery for Lung Diseases, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
| | - Senye Takahashi
- Department of Drug Discovery for Lung Diseases, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
- Department of Clinical Application, Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto 606-8507, Japan
| | - Haruka Yamaki
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
- Department of Clinical Application, Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto 606-8507, Japan
| | - Mitsujiro Osawa
- Department of Clinical Application, Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto 606-8507, Japan
| | - Yasuhiro Setoguchi
- Department of Respiratory Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo 113-8519, Japan
| | - Megumu K Saito
- Department of Clinical Application, Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto 606-8507, Japan
| | - Shinji Abe
- Department of Respiratory Medicine Tokyo, Medical University Hospital, Shinjuku-ku, Tokyo 160-0023, Japan
| | - Toyohiro Hirai
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Shimpei Gotoh
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
- Department of Drug Discovery for Lung Diseases, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
- Department of Clinical Application, Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto 606-8507, Japan
| | - Masatoshi Hagiwara
- Department of Anatomy and Developmental Biology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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5
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Abe J, Ueki M, Honjou R, Takeda K, Seto Y, Nakamura Y, Furuse Y, Nakata K, Cho K. The clinical importance of pulmonary gene and protein expression levels in an infant with lethal ABCA3 variants. Pediatr Pulmonol 2023; 58:2956-2959. [PMID: 37477506 DOI: 10.1002/ppul.26611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 07/07/2023] [Accepted: 07/12/2023] [Indexed: 07/22/2023]
Affiliation(s)
- Jiro Abe
- Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
- Department of Pediatrics, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
- Department of Pediatrics, JCHO Hokkaido Hospital, Sapporo, Japan
| | - Masahiro Ueki
- Department of Pediatrics, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Ryota Honjou
- Department of Pediatrics, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Kenta Takeda
- Department of Pediatrics, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Yoshitaka Seto
- Department of Pediatrics, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Yuichi Nakamura
- Department of Pediatrics, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Yuta Furuse
- Department of Pediatrics, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Koh Nakata
- Division of Pioneering Advanced Therapeutics, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Kazutoshi Cho
- Department of Pediatrics, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
- Department of Pediatrics, JCHO Hokkaido Hospital, Sapporo, Japan
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Yang X, Rapp CK, Li Y, Forstner M, Griese M. Quantifying Functional Impairment of ABCA3 Variants Associated with Interstitial Lung Disease. Int J Mol Sci 2023; 24:ijms24087554. [PMID: 37108718 PMCID: PMC10141231 DOI: 10.3390/ijms24087554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 04/17/2023] [Accepted: 04/18/2023] [Indexed: 04/29/2023] Open
Abstract
ATP-binding cassette subfamily A member 3 (ABCA3) is a lipid transporter within alveolar type II cells. Patients with bi-allelic variants in ABCA3 may suffer from a variable severity of interstitial lung disease. We characterized and quantified ABCA3 variants' overall lipid transport function by assessing the in vitro impairment of its intracellular trafficking and pumping activity. We expressed the results relative to the wild type, integrated the quantitative readouts from eight different assays and used newly generated data combined with previous results to correlate the variants' function and clinical phenotype. We differentiated normal (within 1 normalized standard deviation (nSD) of the wild-type mean), impaired (within 1 to 3 nSD) and defective (beyond 3 nSD) variants. The transport of phosphatidylcholine from the recycling pathway into ABCA3+ vesicles proved sensitive to the variants' dysfunction. The sum of the quantitated trafficking and pumping predicted a clinical outcome. More than an approximately 50% loss of function was associated with considerable morbidity and mortality. The in vitro quantification of ABCA3 function enables detailed variant characterization, substantially improves the phenotype prediction of genetic variants and possibly supports future treatment decisions.
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Affiliation(s)
- Xiaohua Yang
- Dr. von Haunersches Kinderspital, German Center for Lung Research (DZL), University of Munich, Lindwurmstr. 4a, D-80337 Munich, Germany
| | - Christina K Rapp
- Dr. von Haunersches Kinderspital, German Center for Lung Research (DZL), University of Munich, Lindwurmstr. 4a, D-80337 Munich, Germany
| | - Yang Li
- Dr. von Haunersches Kinderspital, German Center for Lung Research (DZL), University of Munich, Lindwurmstr. 4a, D-80337 Munich, Germany
- Medical College, Chongqing University, Chongqing 400030, China
| | - Maria Forstner
- Dr. von Haunersches Kinderspital, German Center for Lung Research (DZL), University of Munich, Lindwurmstr. 4a, D-80337 Munich, Germany
| | - Matthias Griese
- Dr. von Haunersches Kinderspital, German Center for Lung Research (DZL), University of Munich, Lindwurmstr. 4a, D-80337 Munich, Germany
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7
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Balinotti JE, Mallie C, Maffey A, Colom A, Epaud R, de Becdelievre A, Fanen P, Delestrain C, Medín M, Teper A. Inherited pulmonary surfactant metabolism disorders in Argentina: Differences between patients with SFTPC and ABCA3 variants. Pediatr Pulmonol 2023; 58:540-549. [PMID: 36324278 DOI: 10.1002/ppul.26225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 09/30/2022] [Accepted: 11/02/2022] [Indexed: 11/05/2022]
Abstract
BACKGROUND Patients with inherited pulmonary surfactant metabolism disorders have a wide range of clinical outcomes and imaging findings. Response to current anti-inflammatory therapies has been variable and efficacy is unclear. OBJECTIVE To describe and compare genetic, clinical, histological, and computed tomography (CT) outcomes in a cohort of patients with variants in the genes encoding surfactant protein C (SP-C) or adenosine triphosphate-binding cassette transporter A3 (ABCA3) in Argentina. METHODS Observational cohort retrospective study. Patients carrying variants in genes encoding SP-C and ABCA3 proteins were included. RESULTS Fourteen patients met the inclusion criteria: SFTPC n = 6, ABCA3 n = 8 (seven were heterozygous and one compound heterozygous). Neonatal respiratory distress was more frequent and severe in neonates with variants in the ABCA3 gene. The onset of the disease occurred in infancy before the age of 20 months in all cases. Patients with ABCA3 pathogenic variants had a severe clinical course, while long-term outcomes were more favorable in individuals with SFTPC variants. Initial CT findings were ground glass opacities and intraparenchymal cysts in both groups. Over time, signs of lung fibrosis were present in 57% of patients with ABCA3 variants and in 33% of the SFTPC group. The efficacy of anti-inflammatory interventions appears to be poor, especially for patients with ABCA3 pathogenic variants. CONCLUSIONS Clinical, histological, and radiological features are similar in patients with SFTPC and ABCA3 variants; however, the latter have more severe clinical course. Current anti-inflammatory regimens do not appear to stop the progression of the disease.
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Affiliation(s)
- Juan E Balinotti
- Respiratory Center, Ricardo Gutiérrez Children's Hospital, Buenos Aires, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Camila Mallie
- Respiratory Center, Ricardo Gutiérrez Children's Hospital, Buenos Aires, Argentina
| | - Alberto Maffey
- Respiratory Center, Ricardo Gutiérrez Children's Hospital, Buenos Aires, Argentina
| | - Alejandro Colom
- Respiratory Center, Ricardo Gutiérrez Children's Hospital, Buenos Aires, Argentina
| | - Ralph Epaud
- Centre Hospitalier Intercommunal de Créteil, Service de Pédiatrie Générale, Centre de Références des maladies respiratoires rares, Creteil, Île-de-France, France
| | - Alix de Becdelievre
- Hôpital Henri Mondor, Département de Génétique, Creteil, Île-de-France, France
| | - Pascale Fanen
- Hôpital Henri Mondor, Département de Génétique, Creteil, Île-de-France, France
| | - Céline Delestrain
- Centre Hospitalier Intercommunal de Créteil, Service de Pédiatrie Générale, Centre de Références des maladies respiratoires rares, Creteil, Île-de-France, France
| | - Martín Medín
- Pathology Service, Ricardo Gutiérrez Children's Hospital, Buenos Aires, Argentina
| | - Alejandro Teper
- Respiratory Center, Ricardo Gutiérrez Children's Hospital, Buenos Aires, Argentina
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8
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Tirelli C, Pesenti C, Miozzo M, Mondoni M, Fontana L, Centanni S. The Genetic and Epigenetic Footprint in Idiopathic Pulmonary Fibrosis and Familial Pulmonary Fibrosis: A State-of-the-Art Review. Diagnostics (Basel) 2022; 12:diagnostics12123107. [PMID: 36553114 PMCID: PMC9777399 DOI: 10.3390/diagnostics12123107] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 11/29/2022] [Accepted: 12/07/2022] [Indexed: 12/13/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is a rare disease of the lung with a largely unknown etiology and a poor prognosis. Intriguingly, forms of familial pulmonary fibrosis (FPF) have long been known and linked to specific genetic mutations. There is little evidence of the possible role of genetics in the etiology of sporadic IPF. We carried out a non-systematic, narrative literature review aimed at describing the main known genetic and epigenetic mechanisms that are involved in the pathogenesis and prognosis of IPF and FPF. In this review, we highlighted the mutations in classical genes associated with FPF, including those encoding for telomerases (TERT, TERC, PARN, RTEL1), which are also found in about 10-20% of cases of sporadic IPF. In addition to the Mendelian forms, mutations in the genes encoding for the surfactant proteins (SFTPC, SFTPA1, SFTPA2, ABCA3) and polymorphisms of genes for the mucin MUC5B and the Toll-interacting protein TOLLIP are other pathways favoring the fibrogenesis that have been thoroughly explored. Moreover, great attention has been paid to the main epigenetic alterations (DNA methylation, histone modification and non-coding RNA gene silencing) that are emerging to play a role in fibrogenesis. Finally, a gaze on the shared mechanisms between cancer and fibrogenesis, and future perspectives on the genetics of pulmonary fibrosis have been analyzed.
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Affiliation(s)
- Claudio Tirelli
- Respiratory Unit, ASST Santi Paolo e Carlo, Department of Health Sciences, University of Milan, 20142 Milan, Italy
- Correspondence:
| | - Chiara Pesenti
- Medical Genetics Unit, ASST Santi Paolo e Carlo, Department of Health Sciences, University of Milan, 20142 Milan, Italy
| | - Monica Miozzo
- Medical Genetics Unit, ASST Santi Paolo e Carlo, Department of Health Sciences, University of Milan, 20142 Milan, Italy
| | - Michele Mondoni
- Respiratory Unit, ASST Santi Paolo e Carlo, Department of Health Sciences, University of Milan, 20142 Milan, Italy
| | - Laura Fontana
- Medical Genetics Unit, ASST Santi Paolo e Carlo, Department of Health Sciences, University of Milan, 20142 Milan, Italy
| | - Stefano Centanni
- Respiratory Unit, ASST Santi Paolo e Carlo, Department of Health Sciences, University of Milan, 20142 Milan, Italy
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9
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Ma H, Wu X, Li Y, Xia Y. Research Progress in the Molecular Mechanisms, Therapeutic Targets, and Drug Development of Idiopathic Pulmonary Fibrosis. Front Pharmacol 2022; 13:963054. [PMID: 35935869 PMCID: PMC9349351 DOI: 10.3389/fphar.2022.963054] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 06/24/2022] [Indexed: 12/12/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is a fatal interstitial lung disease. Recent studies have identified the key role of crosstalk between dysregulated epithelial cells, mesenchymal, immune, and endothelial cells in IPF. In addition, genetic mutations and environmental factors (e.g., smoking) have also been associated with the development of IPF. With the recent development of sequencing technology, epigenetics, as an intermediate link between gene expression and environmental impacts, has also been reported to be implicated in pulmonary fibrosis. Although the etiology of IPF is unknown, many novel therapeutic targets and agents have emerged from clinical trials for IPF treatment in the past years, and the successful launch of pirfenidone and nintedanib has demonstrated the promising future of anti-IPF therapy. Therefore, we aimed to gain an in-depth understanding of the underlying molecular mechanisms and pathogenic factors of IPF, which would be helpful for the diagnosis of IPF, the development of anti-fibrotic drugs, and improving the prognosis of patients with IPF. In this study, we summarized the pathogenic mechanism, therapeutic targets and clinical trials from the perspective of multiple cell types, gene mutations, epigenetic and environmental factors.
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Affiliation(s)
- Hongbo Ma
- Department of Rehabilitation Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
- West China School of Pharmacy, Sichuan University, Chengdu, China
| | - Xuyi Wu
- Department of Rehabilitation Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Rehabilitation Medicine in Sichuan Province/Rehabilitation Medicine Research Institute, Chengdu, China
| | - Yi Li
- Department of Rehabilitation Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Rehabilitation Medicine in Sichuan Province/Rehabilitation Medicine Research Institute, Chengdu, China
| | - Yong Xia
- Department of Rehabilitation Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Rehabilitation Medicine in Sichuan Province/Rehabilitation Medicine Research Institute, Chengdu, China
- *Correspondence: Yong Xia,
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10
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Wang JY, Young LR. Insights into the Pathogenesis of Pulmonary Fibrosis from Genetic Diseases. Am J Respir Cell Mol Biol 2022; 67:20-35. [PMID: 35294321 PMCID: PMC9273221 DOI: 10.1165/rcmb.2021-0557tr] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 03/16/2022] [Indexed: 11/24/2022] Open
Abstract
Pulmonary fibrosis is a disease process associated with significant morbidity and mortality, with limited therapeutic options owing to an incomplete understanding of the underlying pathophysiology. Mechanisms driving the fibrotic cascade have been elucidated through studies of rare and common variants in surfactant-related and telomere-related genes in familial and sporadic forms of pulmonary fibrosis, as well as in multisystem Mendelian genetic disorders that present with pulmonary fibrosis. In this translational review, we outline insights into the pathophysiology of pulmonary fibrosis derived from genetic forms of the disease, with a focus on model systems, shared cellular and molecular mechanisms, and potential targets for therapy.
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Affiliation(s)
- Joanna Y. Wang
- Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania; and
| | - Lisa R. Young
- Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania; and
- Division of Pulmonary and Sleep Medicine, Department of Pediatrics, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
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11
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Legendre M, Darde X, Ferreira M, Chantot-Bastaraud S, Campana M, Plantier L, Nathan N, Amselem S, Toutain A, Diot P, Marchand-Adam S. The clinical course of interstitial lung disease in an adult patient with an ABCA3 homozygous complex allele under hydroxychloroquine and a review of the literature. SARCOIDOSIS, VASCULITIS, AND DIFFUSE LUNG DISEASES : OFFICIAL JOURNAL OF WASOG 2022; 39:e2022019. [PMID: 36118545 PMCID: PMC9437752 DOI: 10.36141/svdld.v39i2.12730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Accepted: 06/02/2022] [Indexed: 06/15/2023]
Abstract
The gene mutations responsible for ABCA3 protein deficiency are involved in respiratory distress of the newborn and much more rarely in adult interstitial lung diseases (ILD). An adult patient homozygous for a complex allele encompassing the p.Ala1027Pro likely pathogenic mutation and the p.Gly974Asp variation was followed for a late-onset and fibrotic ILD. The evolution was marked by progressive clinical and functional degradation despite corticosteroid pulses. The patient, who was first registered on the list for lung transplantation, was improved quickly and persistently for at least 6.5 years with hydroxychloroquine treatment, allowing removal from the transplant list.
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Affiliation(s)
- Marie Legendre
- Sorbonne Université, APHP, U.F. de Génétique moléculaire, Trousseau Hospital, Paris, France
- Inserm, Sorbonne Université, Maladies génétiques d’expression pédiatrique, UMR_S933, Hôpital Trousseau, Paris, France
| | - Xavier Darde
- Pulmonology department, Tours university hospital, Tours, France
| | - Marion Ferreira
- Pulmonology department, Tours university hospital, Tours, France
- Center for the Study of Respiratory Pathologies, UMR 1100 / EA6305, INSERM, F-37032 Tours, François Rabelais University of Tours, France
| | - Sandra Chantot-Bastaraud
- Inserm, Sorbonne Université, Maladies génétiques d’expression pédiatrique, UMR_S933, Hôpital Trousseau, Paris, France
- Sorbonne Université, APHP, U.F. de Cytogénétique, Trousseau Hospital, Paris, France
| | | | - Laurent Plantier
- Pulmonology department, Tours university hospital, Tours, France
- Center for the Study of Respiratory Pathologies, UMR 1100 / EA6305, INSERM, F-37032 Tours, François Rabelais University of Tours, France
| | - Nadia Nathan
- Inserm, Sorbonne Université, Maladies génétiques d’expression pédiatrique, UMR_S933, Hôpital Trousseau, Paris, France
- Pediatric pulmonology department Sorbonne Université, APHP, centre de référence des maladies respiratoires rares RespiRare, Trousseau Hospital, Paris, France
| | - Serge Amselem
- Inserm, Sorbonne Université, Maladies génétiques d’expression pédiatrique, UMR_S933, Hôpital Trousseau, Paris, France
| | - Annick Toutain
- UMR1253, iBrain, University of Tours, INSERM, Tours, France
- Genetics department, Tours university hospital, Tours, France
| | - Patrice Diot
- Pulmonology department, Tours university hospital, Tours, France
- Center for the Study of Respiratory Pathologies, UMR 1100 / EA6305, INSERM, F-37032 Tours, François Rabelais University of Tours, France
| | - Sylvain Marchand-Adam
- Pulmonology department, Tours university hospital, Tours, France
- Center for the Study of Respiratory Pathologies, UMR 1100 / EA6305, INSERM, F-37032 Tours, François Rabelais University of Tours, France
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12
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Xie T, Zhang Z, Yue J, Fang Q, Gong X. Cryo-EM structures of the human surfactant lipid transporter ABCA3. SCIENCE ADVANCES 2022; 8:eabn3727. [PMID: 35394827 PMCID: PMC8993109 DOI: 10.1126/sciadv.abn3727] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The adenosine 5'-triphosphate (ATP)-binding cassette (ABC) transporter ABCA3 plays a critical role in pulmonary surfactant biogenesis. Mutations in human ABCA3 have been recognized as the most frequent causes of inherited surfactant dysfunction disorders. Despite two decades of research, in vitro biochemical and structural studies of ABCA3 are still lacking. Here, we report the cryo-EM structures of human ABCA3 in two distinct conformations, both at resolution of 3.3 Å. In the absence of ATP, ABCA3 adopts a "lateral-opening" conformation with the lateral surfaces of transmembrane domains (TMDs) exposed to the membrane and features two positively charged cavities within the TMDs as potential substrate binding sites. ATP binding induces pronounced conformational changes, resulting in the collapse of the potential substrate binding cavities. Our results help to rationalize the disease-causing mutations in human ABCA3 and suggest a conserved "lateral access and extrusion" mechanism for both lipid export and import mediated by ABCA transporters.
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13
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Forstner M, Lin S, Yang X, Kinting S, Rothenaigner I, Schorpp K, Li Y, Hadian K, Griese M. High-content Screen Identifies Cyclosporin A as a Novel ABCA3-specific Molecular Corrector. Am J Respir Cell Mol Biol 2021; 66:382-390. [PMID: 34936540 DOI: 10.1165/rcmb.2021-0223oc] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
ATP-binding cassette (ABC) subfamily A member 3 (ABCA3) is a lipid transporter expressed in alveolar type II cells and localized in the limiting membrane of lamellar bodies. It is crucial for pulmonary surfactant storage and homeostasis. Mutations in the ABCA3 gene are the most common genetic cause of respiratory distress syndrome in mature newborns and interstitial lung disease in children. Apart from lung transplantation, there is no cure available. To address the lack of causal therapeutic options for ABCA3 deficiency, a rapid and reliable approach is needed to investigate variant-specific molecular mechanisms and to identify pharmacological modulators for mono- or combination therapies. To this end, we developed a phenotypic cell-based assay to autonomously identify ABCA3 wild-type-like or mutant-like cells by using machine-learning algorithms aimed at identifying morphological differences in WT and mutant cells. The assay was subsequently used to identify new drug candidates for ABCA3 specific molecular correction by high-content screening of 1,280 food and drug administration-approved small molecules. Cyclosporin A (CsA) was identified as a potent corrector, specific for some, but not all ABCA3 variants. Results were validated by our previously established functional small format assays. Hence, CsA may be selected for orphan drug evaluation in controlled repurposing trials in patients.
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Affiliation(s)
- Maria Forstner
- Ludwig Maximilians University Munich Faculty of Medicine, 54187, Department of Pediatric Pneumology, Dr. von Hauner Children's Hospital, Munchen, Germany.,German Center for Lung Research, 542891, Munich, Germany
| | - Sean Lin
- Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt, 9150, Assay Development and Screening Platform, Neuherberg, Germany
| | - Xiaohua Yang
- Ludwig Maximilians University Munich Faculty of Medicine, 54187, Department of Pediatric Pneumology, Dr. von Hauner Children's Hospital, Munchen, Germany
| | - Susanna Kinting
- Ludwig Maximilians University Munich Faculty of Medicine, 54187, Department of Pediatric Pneumology, Dr. von Hauner Children's Hospital, Munchen, Germany
| | - Ina Rothenaigner
- Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt, 9150, Assay Development and Screening Platform, Neuherberg, Germany
| | - Kenji Schorpp
- Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt, 9150, Assay Development and Screening Platform, Neuherberg, Germany
| | - Yang Li
- Ludwig Maximilians University Munich Faculty of Medicine, 54187, Department of Pediatric Pneumology, Dr. von Hauner Children's Hospital, Munchen, Germany
| | - Kamyar Hadian
- Helmholtz Zentrum Munchen Deutsches Forschungszentrum fur Umwelt und Gesundheit, 9150, Assay Development and Screening Platform, Neuherberg, Germany
| | - Matthias Griese
- Ludwig Maximilians University Munich Faculty of Medicine, 54187, Department of Pediatric Pneumology, Dr. von Hauner Children's Hospital, Munchen, Germany.,German Center for Lung Research, 542891, Munich, Germany;
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14
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Kotlyarov S, Kotlyarova A. The Role of ABC Transporters in Lipid Metabolism and the Comorbid Course of Chronic Obstructive Pulmonary Disease and Atherosclerosis. Int J Mol Sci 2021; 22:6711. [PMID: 34201488 PMCID: PMC8269124 DOI: 10.3390/ijms22136711] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/12/2021] [Accepted: 06/18/2021] [Indexed: 12/11/2022] Open
Abstract
Chronic obstructive pulmonary disease (COPD) ranks among the leading causes of morbidity and mortality worldwide. COPD rarely occurs in isolation and is often combined with various diseases. It is considered that systemic inflammation underlies the comorbid course of COPD. The data obtained in recent years have shown the importance of violations of the cross-links of lipid metabolism and the immune response, which are links in the pathogenesis of both COPD and atherosclerosis. The role of lipid metabolism disorders in the pathogenesis of the comorbid course of COPD and atherosclerosis and the participation of ATP-binding cassette (ABC) transporters in these processes is discussed in this article. It is known that about 20 representatives of a large family of ABC transporters provide lipid homeostasis of cells by moving lipids inside the cell and in its plasma membrane, as well as removing lipids from the cell. It was shown that some representatives of the ABC-transporter family are involved in various links of the pathogenesis of COPD and atherosclerosis, which can determine their comorbid course.
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Affiliation(s)
- Stanislav Kotlyarov
- Department of Nursing, Ryazan State Medical University, 390026 Ryazan, Russia
| | - Anna Kotlyarova
- Department of Pharmacology and Pharmacy, Ryazan State Medical University, 390026 Ryazan, Russia;
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15
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ABCA3 mutations in adult pulmonary fibrosis patients: a case series and review of literature. Curr Opin Pulm Med 2021; 26:293-301. [PMID: 32238781 DOI: 10.1097/mcp.0000000000000680] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
PURPOSE OF REVIEW The current review aims to recognize the variability in clinical presentation of adult patients with bi-allelic ABCA3 mutations, create more depth in ABCA3 mutations reported and highlight the influence of environmental factors on disease course. RECENT FINDINGS Mutations in ABCA3 are predominantly linked to neonatal and pediatric interstitial lung disease (ILD) with a minority surviving beyond puberty. Here, we present three patients with ABCA3 mutations who present with disease at the age of 19, 61 and 77. Moreover, we identified c.4451G>C (p.R1484P), c.1675G>A (p.G559R) and c.4745C>G (p.T1582S) as three novel ABCA3 mutations. In addition, we identified six additional patients with ABCA3 mutations in literature who reached an age above 18. Furthermore, we discuss the influence of infections, drugs and smoking on disease course. SUMMARY Although extremely rare, patients with bi-allelic mutations in ABCA3 may present at adulthood. Late onset of disease may be influenced by type of mutation or environmental factors.
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16
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Nakato M, Shiranaga N, Tomioka M, Watanabe H, Kurisu J, Kengaku M, Komura N, Ando H, Kimura Y, Kioka N, Ueda K. ABCA13 dysfunction associated with psychiatric disorders causes impaired cholesterol trafficking. J Biol Chem 2021; 296:100166. [PMID: 33478937 PMCID: PMC7948424 DOI: 10.1074/jbc.ra120.015997] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 12/03/2020] [Accepted: 12/08/2020] [Indexed: 01/22/2023] Open
Abstract
ATP-binding cassette subfamily A member 13 (ABCA13) is predicted to be the largest ABC protein, consisting of 5058 amino acids and a long N-terminal region. Mutations in the ABCA13 gene were reported to increase the susceptibility to schizophrenia, bipolar disorder, and major depression. However, little is known about the molecular functions of ABCA13 or how they associate with psychiatric disorders. Here, we examined the biochemical activity of ABCA13 using HEK293 cells transfected with mouse ABCA13. The expression of ABCA13 induced the internalization of cholesterol and gangliosides from the plasma membrane to intracellular vesicles. Cholesterol internalization by ABCA13 required the long N-terminal region and ATP hydrolysis. To examine the physiological roles of ABCA13, we generated Abca13 KO mice using CRISPR/Cas and found that these mice exhibited deficits of prepulse inhibition. Vesicular cholesterol accumulation and synaptic vesicle endocytosis were impaired in primary cultures of Abca13 KO cortical neurons. Furthermore, mutations in ABCA13 gene associated with psychiatric disorders disrupted the protein's subcellular localization and impaired cholesterol trafficking. These findings suggest that ABCA13 accelerates cholesterol internalization by endocytic retrograde transport in neurons and that loss of this function is associated with the pathophysiology of psychiatric disorders.
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Affiliation(s)
- Mitsuhiro Nakato
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan.
| | - Naoko Shiranaga
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Maiko Tomioka
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Hitomi Watanabe
- Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Junko Kurisu
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Kyoto, Japan
| | - Mineko Kengaku
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Kyoto, Japan
| | - Naoko Komura
- Institute for Glyco-core Research (iGCORE), Gifu University, Gifu, Japan; Center for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN), Gifu University, Gifu, Japan
| | - Hiromune Ando
- Institute for Glyco-core Research (iGCORE), Gifu University, Gifu, Japan; Center for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN), Gifu University, Gifu, Japan
| | - Yasuhisa Kimura
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Noriyuki Kioka
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Kazumitsu Ueda
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Kyoto, Japan.
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17
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Wambach JA, Yang P, Wegner DJ, Heins HB, Luke C, Li F, White FV, Cole FS. Functional Genomics of ABCA3 Variants. Am J Respir Cell Mol Biol 2020; 63:436-443. [PMID: 32692933 DOI: 10.1165/rcmb.2020-0034ma] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Rare or private, biallelic variants in the ABCA3 (ATP-binding cassette transporter A3) gene are the most common monogenic cause of lethal neonatal respiratory failure and childhood interstitial lung disease. Functional characterization of fewer than 10% of over 200 disease-associated ABCA3 variants (majority missense) suggests either disruption of ABCA3 protein trafficking (type I) or of ATPase-mediated phospholipid transport (type II). Therapies remain limited and nonspecific. A scalable platform is required for functional characterization of ABCA3 variants and discovery of pharmacologic correctors. To address this need, we first silenced the endogenous ABCA3 locus in A549 cells with CRISPR/Cas9 genome editing. Next, to generate a parent cell line (A549/ABCA3-/-) with a single recombination target site for genomic integration and stable expression of individual ABCA3 missense variant cDNAs, we used lentiviral-mediated integration of a LoxFAS cassette, FACS, and dilutional cloning. To assess the fidelity of this cell-based model, we compared functional characterization (ABCA3 protein processing, ABCA3 immunofluorescence colocalization with intracellular markers, ultrastructural vesicle phenotype) of two individual ABCA3 mutants (type I mutant, p.L101P; type II mutant, p.E292V) in A549/ABCA3-/- cells and in both A549 cells and primary, human alveolar type II cells that transiently express each cDNA after adenoviral-mediated transduction. We also confirmed pharmacologic rescue of ABCA3 variant-encoded mistrafficking and vesicle diameter in A549/ABCA3-/- cells that express p.G1421R (type I mutant). A549/ABCA3-/- cells provide a scalable, genetically versatile, physiologically relevant functional genomics platform for discovery of variant-specific mechanisms that disrupt ABCA3 function and for screening of potential ABCA3 pharmacologic correctors.
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Affiliation(s)
| | - Ping Yang
- Edward Mallinckrodt Department of Pediatrics
| | | | | | - Cliff Luke
- Edward Mallinckrodt Department of Pediatrics
| | - Fuhai Li
- Edward Mallinckrodt Department of Pediatrics.,Institute for Informatics, and
| | - Frances V White
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri
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Wu ZQ, Xu J, Zhang AM, Hu X, Huang FR. [Dyspnea and ventilator dependence after birth in a full-term female infant]. ZHONGGUO DANG DAI ER KE ZA ZHI = CHINESE JOURNAL OF CONTEMPORARY PEDIATRICS 2020; 22:897-902. [PMID: 32800039 PMCID: PMC7441518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 06/12/2020] [Indexed: 11/13/2023]
Abstract
A female infant, aged 43 days, had shortness of breath, cyanosis, groan, and dyspnea since birth. Physical examination showed cyanosis of lips and three-concave sign, and multiple lung imaging examinations showed diffuse ground-glass opacities in both lungs. The girl was given anti-infective therapy and continuous mechanical ventilation but there were no significant improvements in symptoms. Gene testing confirmed a compound heterozygous mutation, c.1890C>A(p.Tyr630Ter)+c.3208G>A(p.Ala1070Thr), in the ABCA3 gene, with the former from her father and the latter from her mother. Pathological examination of the lungs indicated pulmonary interstitial disease. The girl was diagnosed with infantile diffuse pulmonary interstitial disease caused by mutations in the ABCA3 gene. When full-term neonates experience shortness of breath and dyspnea after birth, pulmonary imaging suggests diffuse ground-glass changes, and conventional treatment is not effective (ventilator-dependent), congenital pulmonary surfactant metabolism defects needs to be considered. Gene testing, which can provide a basis for early intervention, prognostic evaluation, and genetic counseling, should be performed as early as possible.
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Affiliation(s)
- Zi-Qi Wu
- Department of Neonatology, Hunan Provincial People's Hospital/ First Affiliated Hospital of Hunan Normal University, Changsha 410005, China.
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19
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Wu ZQ, Xu J, Zhang AM, Hu X, Huang FR. [Dyspnea and ventilator dependence after birth in a full-term female infant]. ZHONGGUO DANG DAI ER KE ZA ZHI = CHINESE JOURNAL OF CONTEMPORARY PEDIATRICS 2020; 22:897-902. [PMID: 32800039 PMCID: PMC7441518 DOI: 10.7499/j.issn.1008-8830.2003332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 06/12/2020] [Indexed: 06/11/2023]
Abstract
A female infant, aged 43 days, had shortness of breath, cyanosis, groan, and dyspnea since birth. Physical examination showed cyanosis of lips and three-concave sign, and multiple lung imaging examinations showed diffuse ground-glass opacities in both lungs. The girl was given anti-infective therapy and continuous mechanical ventilation but there were no significant improvements in symptoms. Gene testing confirmed a compound heterozygous mutation, c.1890C>A(p.Tyr630Ter)+c.3208G>A(p.Ala1070Thr), in the ABCA3 gene, with the former from her father and the latter from her mother. Pathological examination of the lungs indicated pulmonary interstitial disease. The girl was diagnosed with infantile diffuse pulmonary interstitial disease caused by mutations in the ABCA3 gene. When full-term neonates experience shortness of breath and dyspnea after birth, pulmonary imaging suggests diffuse ground-glass changes, and conventional treatment is not effective (ventilator-dependent), congenital pulmonary surfactant metabolism defects needs to be considered. Gene testing, which can provide a basis for early intervention, prognostic evaluation, and genetic counseling, should be performed as early as possible.
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Affiliation(s)
- Zi-Qi Wu
- Department of Neonatology, Hunan Provincial People's Hospital/ First Affiliated Hospital of Hunan Normal University, Changsha 410005, China.
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20
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Hu JY, Yang P, Wegner DJ, Heins HB, Luke CJ, Li F, White FV, Silverman GA, Cole FS, Wambach JA. Functional characterization of four ATP-binding cassette transporter A3 gene (ABCA3) variants. Hum Mutat 2020; 41:1298-1307. [PMID: 32196812 PMCID: PMC7292786 DOI: 10.1002/humu.24014] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 03/08/2020] [Accepted: 03/17/2020] [Indexed: 12/30/2022]
Abstract
ABCA3 transports phospholipids across lamellar body membranes in pulmonary alveolar type II cells and is required for surfactant assembly. Rare, biallelic, pathogenic ABCA3 variants result in lethal neonatal respiratory distress syndrome and childhood interstitial lung disease. Qualitative functional characterization of ABCA3 missense variants suggests two pathogenic classes: disrupted intracellular trafficking (type I mutant) or impaired ATPase-mediated phospholipid transport into the lamellar bodies (type II mutant). We qualitatively compared wild-type (WT-ABCA3) with four uncharacterized ABCA3 variants (c.418A>C;p.Asn140His, c.3609_3611delCTT;p.Phe1203del, c.3784A>G;p.Ser1262Gly, and c.4195G>A;p.Val1399Met) in A549 cells using protein processing, colocalization with intracellular organelles, lamellar body ultrastructure, and ATPase activity. We quantitatively measured lamellar body-like vesicle diameter and intracellular ABCA3 trafficking using fluorescence-based colocalization. Three ABCA3 variants (p.Asn140His, p.Ser1262Gly, and p.Val1399Met) were processed and trafficked normally and demonstrated well-organized lamellar body-like vesicles, but had reduced ATPase activity consistent with type II mutants. P.Phe1203del was processed normally, had reduced ATPase activity, and well-organized lamellar body-like vesicles, but quantitatively colocalized with both endoplasmic reticulum and lysosomal markers, an intermediate phenotype suggesting disruption of both intracellular trafficking and phospholipid transport. All ABCA3 mutants demonstrated mean vesicle diameters smaller than WT-ABCA3. Qualitative and quantitative functional characterization of ABCA3 variants informs mechanisms of pathogenicity.
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Affiliation(s)
- June Y. Hu
- Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
| | - Ping Yang
- Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
| | - Daniel J. Wegner
- Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
| | - Hillary B. Heins
- Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
| | - Cliff J. Luke
- Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
| | - Fuhai Li
- Institute for Informatics, Washington University School of Medicine, St. Louis, Missouri
| | - Frances V. White
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri
| | - Gary A. Silverman
- Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
| | - F. Sessions Cole
- Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
| | - Jennifer A. Wambach
- Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
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21
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Wei M, Fu H, Han A, Ma L. A Term Neonatal Case With Lethal Respiratory Failure Associated With a Novel Homozygous Mutation in ABCA3 Gene. Front Pediatr 2020; 8:138. [PMID: 32363169 PMCID: PMC7181334 DOI: 10.3389/fped.2020.00138] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Accepted: 03/11/2020] [Indexed: 11/13/2022] Open
Abstract
The mutations in the ABCA3 (ATP-binding cassette transporter subfamily A member 3) gene could result in lethal respiratory distress syndrome (RDS) in neonates and interstitial lung disease (ILD) in infants and children. Here, we describe a full-term newborn who manifested respiratory distress 20 min after birth and then gradually developed hypoxemic respiratory failure and died on 53 days of life. A homozygous missense mutation (c.746C >T) was identified in exon 8 of ABCA3 gene in the neonate by next-generation sequencing, and the mutations were inherited from parents, respectively. This homozygous mutation is the first reported to date.
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Affiliation(s)
- Meili Wei
- Department of Pediatrics, Zibo Central Hospital, Shandong, China
| | - Haibo Fu
- Department of Pediatrics, Zibo Central Hospital, Shandong, China
| | - Aiqin Han
- Department of Pediatrics, Zibo Central Hospital, Shandong, China
| | - Liji Ma
- Department of Pediatrics, Zibo Central Hospital, Shandong, China
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22
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Thomas BJ, Wight IE, Chou WYY, Moreno M, Dawson Z, Homayouni A, Huang H, Kim H, Jia H, Buland JR, Wambach JA, Cole FS, Pak SC, Silverman GA, Luke CJ. CemOrange2 fusions facilitate multifluorophore subcellular imaging in C. elegans. PLoS One 2019; 14:e0214257. [PMID: 30913273 PMCID: PMC6435234 DOI: 10.1371/journal.pone.0214257] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 03/08/2019] [Indexed: 11/18/2022] Open
Abstract
Due to its ease of genetic manipulation and transparency, Caenorhabditis elegans (C. elegans) has become a preferred model system to study gene function by microscopy. The use of Aequorea victoria green fluorescent protein (GFP) fused to proteins or targeting sequences of interest, further expanded upon the utility of C. elegans by labeling subcellular structures, which enables following their disposition during development or in the presence of genetic mutations. Fluorescent proteins with excitation and emission spectra different from that of GFP accelerated the use of multifluorophore imaging in real time. We have expanded the repertoire of fluorescent proteins for use in C. elegans by developing a codon-optimized version of Orange2 (CemOrange2). Proteins or targeting motifs fused to CemOrange2 were distinguishable from the more common fluorophores used in the nematode; such as GFP, YFP, and mKate2. We generated a panel of CemOrange2 fusion constructs, and confirmed they were targeted to their correct subcellular addresses by colocalization with independent markers. To demonstrate the potential usefulness of this new panel of fluorescent protein markers, we showed that CemOrange2 fusion proteins could be used to: 1) monitor biological pathways, 2) multiplex with other fluorescent proteins to determine colocalization and 3) gain phenotypic knowledge of a human ABCA3 orthologue, ABT-4, trafficking variant in the C. elegans model organism.
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Affiliation(s)
- Brian J. Thomas
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Ira E. Wight
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Wendy Y. Y. Chou
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Marco Moreno
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Zachary Dawson
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Arielle Homayouni
- Division of Biology and Biomedical Sciences, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Huiyan Huang
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Hyori Kim
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Hanna Jia
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Justin R. Buland
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Jennifer A. Wambach
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - F. Sessions Cole
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO, United States of America
| | - Stephen C. Pak
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
| | - Gary A. Silverman
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO, United States of America
- Department of Genetics, Washington University School of Medicine, St. Louis, MO, United States of America
| | - Cliff J. Luke
- Department of Pediatrics, Washington University School of Medicine and St. Louis Children’s Hospital, St. Louis, MO, United States of America
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23
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Dickens JA, Malzer E, Chambers JE, Marciniak SJ. Pulmonary endoplasmic reticulum stress-scars, smoke, and suffocation. FEBS J 2019; 286:322-341. [PMID: 29323786 DOI: 10.1111/febs.14381] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 12/11/2017] [Accepted: 01/08/2018] [Indexed: 12/14/2022]
Abstract
Protein misfolding within the endoplasmic reticulum (ER stress) can be a cause or consequence of pulmonary disease. Mutation of proteins restricted to the alveolar type II pneumocyte can lead to inherited forms of pulmonary fibrosis, but even sporadic cases of pulmonary fibrosis appear to be strongly associated with activation of the unfolded protein response and/or the integrated stress response. Inhalation of smoke can impair protein folding and may be an important cause of pulmonary ER stress. Similarly, tissue hypoxia can lead to impaired protein homeostasis (proteostasis). But the mechanisms linking smoke and hypoxia to ER stress are only partially understood. In this review, we will examine the role of ER stress in the pathogenesis of lung disease by focusing on fibrosis, smoke, and hypoxia.
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Affiliation(s)
- Jennifer A Dickens
- Cambridge Institute for Medical Research (CIMR), University of Cambridge, UK
| | - Elke Malzer
- Cambridge Institute for Medical Research (CIMR), University of Cambridge, UK
| | - Joseph E Chambers
- Cambridge Institute for Medical Research (CIMR), University of Cambridge, UK
| | - Stefan J Marciniak
- Cambridge Institute for Medical Research (CIMR), University of Cambridge, UK
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24
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Zaman T, Lee JS. Risk factors for the development of idiopathic pulmonary fibrosis: A review. CURRENT PULMONOLOGY REPORTS 2018; 7:118-125. [PMID: 31588408 DOI: 10.1007/s13665-018-0210-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Purpose of Review Idiopathic pulmonary fibrosis (IPF) is an invariably progressive disease. Current treatment options simply slow disease progression and better therapeutic options are needed. We aimed to review emerging literature on risk factors associated with the development of IPF. Recent findings There is increasing data to support the role of intrinsic risk factors (e.g. genetics, aging, sex, lung microbiome), co-morbidities (e.g. gastroesophageal reflux, obstructive sleep apnea, diabetes mellitus, herpes virus infection), and extrinsic risk factors (e.g. cigarette smoking, environmental exposures, air pollution) in IPF development. These risk factors may independently increase susceptibility for IPF or act in a synergistic fashion to contribute to increased risk for disease development. Summary Various risk factors have been identified in IPF development that fit within the current paradigm of disease pathogenesis. Further investigation in to these risk factors may help us better understand the pathophysiology of IPF and may guide future therapeutic interventions.
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Affiliation(s)
- Tanzira Zaman
- Department of Medicine, University of Colorado Denver, Aurora, CO
| | - Joyce S Lee
- Department of Medicine, University of Colorado Denver, Aurora, CO
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25
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Klay D, Hoffman TW, Harmsze AM, Grutters JC, van Moorsel CHM. Systematic review of drug effects in humans and models with surfactant-processing disease. Eur Respir Rev 2018; 27:27/149/170135. [PMID: 29997245 DOI: 10.1183/16000617.0135-2017] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 04/12/2018] [Indexed: 12/14/2022] Open
Abstract
Fibrotic interstitial pneumonias are a group of rare diseases characterised by distortion of lung interstitium. Patients with mutations in surfactant-processing genes, such as surfactant protein C (SFTPC), surfactant protein A1 and A2 (SFTPA1 and A2), ATP binding cassette A3 (ABCA3) and Hermansky-Pudlak syndrome (HPS1, 2 and 4), develop progressive pulmonary fibrosis, often culminating in fatal respiratory insufficiency. Although many mutations have been described, little is known about the optimal treatment strategy for fibrotic interstitial pneumonia patients with surfactant-processing mutations.We performed a systematic literature review of studies that described a drug effect in patients, cell or mouse models with a surfactant-processing mutation. In total, 73 articles were selected, consisting of 55 interstitial lung disease case reports/series, two clinical trials and 16 cell or mouse studies. Clinical effect parameters included lung function, radiological characteristics and clinical symptoms, while experimental outcome parameters included chemokine/cytokine expression, surfactant trafficking, necrosis and apoptosis. SP600125, a c-jun N-terminal kinase (JNK) inhibitor, hydroxychloroquine and 4-phenylbutyric acid were most frequently studied in disease models and lead to variable outcomes, suggesting that outcome is mutation dependent.This systematic review summarises effect parameters for future studies on surfactant-processing disorders in disease models and provides directions for future trials in affected patients.
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Affiliation(s)
- Dymph Klay
- Interstitial Lung Disease Center of Excellence, Dept of Pulmonology, St Antonius Hospital, Nieuwegein, The Netherlands
| | - Thijs W Hoffman
- Interstitial Lung Disease Center of Excellence, Dept of Pulmonology, St Antonius Hospital, Nieuwegein, The Netherlands
| | - Ankie M Harmsze
- Dept of Clinical Pharmacy, St Antonius Hospital, Nieuwegein, The Netherlands
| | - Jan C Grutters
- Interstitial Lung Disease Center of Excellence, Dept of Pulmonology, St Antonius Hospital, Nieuwegein, The Netherlands.,Division of Heart and Lung, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Coline H M van Moorsel
- Interstitial Lung Disease Center of Excellence, Dept of Pulmonology, St Antonius Hospital, Nieuwegein, The Netherlands .,Division of Heart and Lung, University Medical Center Utrecht, Utrecht, The Netherlands
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26
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Schindlbeck U, Wittmann T, Höppner S, Kinting S, Liebisch G, Hegermann J, Griese M. ABCA3 missense mutations causing surfactant dysfunction disorders have distinct cellular phenotypes. Hum Mutat 2018; 39:841-850. [PMID: 29505158 DOI: 10.1002/humu.23416] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 02/25/2018] [Accepted: 02/27/2018] [Indexed: 11/11/2022]
Abstract
Mutations in the ATP-binding cassette subfamily A member 3 (ABCA3) gene are the most common monogenetic cause of surfactant dysfunction disorders in newborns and interstitial lung diseases in children and young adults. Although the effect of mutations resulting in truncated or incomplete proteins can be predicted, the consequences of missense variants cannot be as easily. Our aim was to investigate the intracellular handling and disturbance of the cellular surfactant system in a stable cell model with several different clinically relevant ABCA3 missense mutations. We found that the investigated missense mutations within the ABCA3 gene affect surfactant homeostasis in different ways: first by disrupting intracellular ABCA3 protein localization (c.643C > A, p.Q215K; c.2279T > G, p.M760R), second by impairing the lipid transport of ABCA3 protein (c.875A > T, p.E292V; c.4164G > C, p.K1388N), and third by yet undetermined mechanisms predisposing for the development of interstitial lung diseases despite correct localization and normal lipid transport of the variant ABCA3 protein (c.622C > T, p.R208W; c.863G > A, p.R288K; c.2891G > A, p.G964D). In conclusion, we classified cellular consequences of missense ABCA3 sequence variations leading to pulmonary disease of variable severity. The corresponding molecular pathomechanisms of such ABCA3 variants may specifically be addressed by targeted treatments.
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Affiliation(s)
- Ulrike Schindlbeck
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Centre for Lung Research (DZL), Munich, Germany
| | - Thomas Wittmann
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Centre for Lung Research (DZL), Munich, Germany
| | - Stefanie Höppner
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Centre for Lung Research (DZL), Munich, Germany
| | - Susanna Kinting
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Centre for Lung Research (DZL), Munich, Germany
| | - Gerhard Liebisch
- Institute for Clinical Chemistry and Laboratory Medicine, University of Regensburg, Regensburg, Germany
| | - Jan Hegermann
- Institute of Functional and Applied Anatomy, Hannover Medical School, German Center for Lung Research (DZL), Hannover, Germany
| | - Matthias Griese
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Centre for Lung Research (DZL), Munich, Germany
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27
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Höppner S, Kinting S, Torrano AA, Schindlbeck U, Bräuchle C, Zarbock R, Wittmann T, Griese M. Quantification of volume and lipid filling of intracellular vesicles carrying the ABCA3 transporter. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:2330-2335. [DOI: 10.1016/j.bbamcr.2017.08.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 08/23/2017] [Accepted: 08/31/2017] [Indexed: 12/20/2022]
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28
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Kaur A, Mathai SK, Schwartz DA. Genetics in Idiopathic Pulmonary Fibrosis Pathogenesis, Prognosis, and Treatment. Front Med (Lausanne) 2017; 4:154. [PMID: 28993806 PMCID: PMC5622313 DOI: 10.3389/fmed.2017.00154] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 09/07/2017] [Indexed: 12/14/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF), the most common form of idiopathic interstitial pneumonia (IIP), is characterized by irreversible scarring of the lung parenchyma and progressive decline in lung function leading to eventual respiratory failure. The prognosis of IPF is poor with a median survival of 3–5 years after diagnosis and no curative medical therapies. Although the pathogenesis of IPF is not well understood, there is a growing body of evidence that genetic factors contribute to disease risk. Recent studies have identified common and rare genetic variants associated with both sporadic and familial forms of pulmonary fibrosis, with at least one-third of the risk for developing fibrotic IIP explained by common genetic variants. The IPF-associated genetic loci discovered to date are implicated in diverse biological processes, including alveolar stability, host defense, cell–cell barrier function, and cell senescence. In addition, some common variants have also been associated with distinct clinical phenotypes. Better understanding of how genetic variation plays a role in disease risk and phenotype could identify potential therapeutic targets and inform clinical decision-making. In addition, clinical studies should be designed controlling for the genetic backgrounds of subjects, since clinical outcomes and therapeutic responses may differ by genotype. Further understanding of these differences will allow the development of personalized approaches to the IPF management.
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Affiliation(s)
- Amarpreet Kaur
- Department of Medicine, University of Colorado Denver School of Medicine, Aurora, CO, United States
| | - Susan K Mathai
- Department of Medicine, Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Denver School of Medicine, Aurora, CO, United States
| | - David A Schwartz
- Department of Medicine, Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Denver School of Medicine, Aurora, CO, United States
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29
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Wambach JA, Yang P, Wegner DJ, Heins HB, Kaliberova LN, Kaliberov SA, Curiel DT, White FV, Hamvas A, Hackett BP, Cole FS. Functional Characterization of ATP-Binding Cassette Transporter A3 Mutations from Infants with Respiratory Distress Syndrome. Am J Respir Cell Mol Biol 2017; 55:716-721. [PMID: 27374344 DOI: 10.1165/rcmb.2016-0008oc] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Mutations in the ATP-binding cassette transporter A3 gene (ABCA3) result in severe neonatal respiratory distress syndrome and childhood interstitial lung disease. As most ABCA3 mutations are rare or private, determination of mutation pathogenicity is often based on results from in silico prediction tools, identification in unrelated diseased individuals, statistical association studies, or expert opinion. Functional biologic studies of ABCA3 mutations are needed to confirm mutation pathogenicity and inform clinical decision making. Our objective was to functionally characterize two ABCA3 mutations (p.R288K and p.R1474W) identified among term and late-preterm infants with respiratory distress syndrome with unclear pathogenicity in a genetically versatile model system. We performed transient transfection of HEK293T cells with wild-type or mutant ABCA3 alleles to assess protein processing with immunoblotting. We used transduction of A549 cells with adenoviral vectors, which concurrently silenced endogenous ABCA3 and expressed either wild-type or mutant ABCA3 alleles (p.R288K and p.R1474W) to assess immunofluorescent localization, ATPase activity, and organelle ultrastructure. Both ABCA3 mutations (p.R288K and p.R1474W) encoded proteins with reduced ATPase activity but with normal intracellular localization and protein processing. Ultrastructural phenotypes of lamellar body-like vesicles in A549 cells transduced with mutant alleles were similar to wild type. Mutant proteins encoded by ABCA3 mutations p.R288K and p.R1474W had reduced ATPase activity, a biologically plausible explanation for disruption of surfactant metabolism by impaired phospholipid transport into the lamellar body. These results also demonstrate the usefulness of a genetically versatile, human model system for functional characterization of ABCA3 mutations with unclear pathogenicity.
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Affiliation(s)
| | - Ping Yang
- 1 Edward Mallinckrodt Department of Pediatrics, and
| | | | | | | | | | | | - Frances V White
- 3 Pathology, Washington University School of Medicine, St. Louis, Missouri; and
| | - Aaron Hamvas
- 4 Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois
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30
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Marciniak SJ. Endoplasmic reticulum stress in lung disease. Eur Respir Rev 2017; 26:170018. [PMID: 28659504 PMCID: PMC9488656 DOI: 10.1183/16000617.0018-2017] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 05/15/2017] [Indexed: 12/19/2022] Open
Abstract
Exposure to inhaled pollutants, including fine particulates and cigarette smoke is a major cause of lung disease in Europe. While it is established that inhaled pollutants have devastating effects on the genome, it is now recognised that additional effects on protein folding also drive the development of lung disease. Protein misfolding in the endoplasmic reticulum affects the pathogenesis of many diseases, ranging from pulmonary fibrosis to cancer. It is therefore important to understand how cells respond to endoplasmic reticulum stress and how this affects pulmonary tissues in disease. These insights may offer opportunities to manipulate such endoplasmic reticulum stress pathways and thereby cure lung disease.
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Affiliation(s)
- Stefan J Marciniak
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, UK
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31
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Zhou W, Zhuang Y, Sun J, Wang X, Zhao Q, Xu L, Wang Y. Variants of the ABCA3 gene might contribute to susceptibility to interstitial lung diseases in the Chinese population. Sci Rep 2017; 7:4097. [PMID: 28642621 PMCID: PMC5481373 DOI: 10.1038/s41598-017-04486-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 05/16/2017] [Indexed: 01/06/2023] Open
Abstract
ATP-binding cassette A3 (ABCA3) is a phospholipid carrier that is mainly expressed in the alveolar epithelium. Biallelic mutations of ABCA3 has been associated with fatal respiratory distress syndrome and interstitial lung disease (ILD) in children. However, whether variations in ABCA3 have a role in the development of adult ILD, including idiopathic pulmonary fibrosis (IPF), remains to be addressed. In this study, we screened for germline variants of ABCA3 by exons-sequencing in 30 patients with sporadic IPF and in 30 matched healthy controls. Eleven missense variants, predominantly in heterozygous, were found in 13 of these patients, but only two missenses in 2 healthy controls. We then selected four of the detected missense variants (p.L39V, p.S828F, p.V968M and p.G1205R) to performed cohort analysis in 1,024 ILD patients, containing 250 IPF and 774 connective tissue disease-ILD (CTD-ILD) patients, and 1,054 healthy individuals. Our results showed that the allele frequency of p.G1205R, but not p.L39V, was significantly higher in ILD patients than in healthy controls. However, no additional subject carrying the variant p.S828F or p.V968M was detected in the cohort analysis. These results indicate that the heterozygous ABCA3 gene variants may contribute to susceptibility to diseases in the Chinese population.
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Affiliation(s)
- Wei Zhou
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Yi Zhuang
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Department of Respirology, Medical School Affiliated Drum Tower Hospital, Nanjing University, Nanjing, China
| | - Jiapeng Sun
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Xiaofen Wang
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Qingya Zhao
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Lizhi Xu
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Yaping Wang
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China.
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China.
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32
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A functional variant in NEPH3 gene confers high risk of renal failure in primary hematuric glomerulopathies. Evidence for predisposition to microalbuminuria in the general population. PLoS One 2017; 12:e0174274. [PMID: 28334007 PMCID: PMC5363870 DOI: 10.1371/journal.pone.0174274] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Accepted: 03/06/2017] [Indexed: 01/06/2023] Open
Abstract
Background Recent data emphasize that thin basement membrane nephropathy (TBMN) should not be viewed as a form of benign familial hematuria since chronic renal failure (CRF) and even end-stage renal disease (ESRD), is a possible development for a subset of patients on long-term follow-up, through the onset of focal and segmental glomerulosclerosis (FSGS). We hypothesize that genetic modifiers may explain this variability of symptoms. Methods We looked in silico for potentially deleterious functional SNPs, using very strict criteria, in all the genes significantly expressed in the slit diaphragm (SD). Two variants were genotyped in a cohort of well-studied adult TBMN patients from 19 Greek-Cypriot families, with a homogeneous genetic background. Patients were categorized as “Severe” or “Mild”, based on the presence or not of proteinuria, CRF and ESRD. A larger pooled cohort (HEMATURIA) of 524 patients, including IgA nephropathy patients, was used for verification. Additionally, three large general population cohorts [Framingham Heart Study (FHS), KORAF4 and SAPHIR] were used to investigate if the NEPH3-V353M variant has any renal effect in the general population. Results and conclusions Genotyping for two high-scored variants in 103 TBMN adult patients with founder mutations who were classified as mildly or severely affected, pointed to an association with variant NEPH3-V353M (filtrin). This promising result prompted testing in the larger pooled cohort (HEMATURIA), indicating an association of the 353M variant with disease severity under the dominant model (p = 3.0x10-3, OR = 6.64 adjusting for gender/age; allelic association: p = 4.2x10-3 adjusting for patients’ kinships). Subsequently, genotyping 6,531 subjects of the Framingham Heart Study (FHS) revealed an association of the homozygous 353M/M genotype with microalbuminuria (p = 1.0x10-3). Two further general population cohorts, KORAF4 and SAPHIR confirmed the association, and a meta-analysis of all three cohorts (11,258 individuals) was highly significant (p = 1.3x10-5, OR = 7.46). Functional studies showed that Neph3 homodimerization and Neph3-Nephrin heterodimerization are disturbed by variant 353M. Additionally, 353M was associated with differential activation of the unfolded protein response pathway, when overexpressed in stressed cultured undifferentiated podocyte cells, thus attesting to its functional significance. Genetics and functional studies support a “rare variant-strong effect” role for NEPH3-V353M, by exerting a negative modifier effect on primary glomerular hematuria. Additionally, genetics studies provide evidence for a role in predisposing homozygous subjects of the general population to micro-albuminuria.
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33
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Chai AB, Ammit AJ, Gelissen IC. Examining the role of ABC lipid transporters in pulmonary lipid homeostasis and inflammation. Respir Res 2017; 18:41. [PMID: 28241820 PMCID: PMC5330150 DOI: 10.1186/s12931-017-0526-9] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Accepted: 02/21/2017] [Indexed: 01/03/2023] Open
Abstract
Respiratory diseases including asthma and chronic obstructive pulmonary disease (COPD) are characterised by excessive and persistent inflammation. Current treatments are often inadequate for symptom and disease control, and hence new therapies are warranted. Recent emerging research has implicated dyslipidaemia in pulmonary inflammation. Three ATP-binding cassette (ABC) transporters are found in the mammalian lung – ABCA1, ABCG1 and ABCA3 – that are involved in movement of cholesterol and phospholipids from lung cells. The aim of this review is to corroborate the current evidence for the role of ABC lipid transporters in pulmonary lipid homeostasis and inflammation. Here, we summarise results from murine knockout studies, human diseases associated with ABC transporter mutations, and in vitro studies. Disruption to ABC transporter activity results in lipid accumulation and elevated levels of inflammatory cytokines in lung tissue. Furthermore, these ABC-knockout mice exhibit signs of respiratory distress. ABC lipid transporters appear to have a crucial and protective role in the lung. However, our knowledge of the underlying molecular mechanisms for these benefits requires further attention. Understanding the relationship between cholesterol and inflammation in the lung, and the role that ABC transporters play in this may illuminate new pathways to target for the treatment of inflammatory lung diseases.
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Affiliation(s)
- Amanda B Chai
- Faculty of Pharmacy, University of Sydney, Sydney, NSW, 2006, Australia
| | - Alaina J Ammit
- Woolcock Emphysema Centre, Woolcock Institute of Medical Research, University of Sydney, Camperdown, NSW, Australia. .,School of Life Sciences, University of Technology, Sydney, NSW, Australia.
| | - Ingrid C Gelissen
- Faculty of Pharmacy, University of Sydney, Sydney, NSW, 2006, Australia
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Torday JS, Nielsen HC. The Molecular Apgar Score: A Key to Unlocking Evolutionary Principles. Front Pediatr 2017; 5:45. [PMID: 28373969 PMCID: PMC5357830 DOI: 10.3389/fped.2017.00045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 02/17/2017] [Indexed: 01/06/2023] Open
Abstract
One of the first "tools" used for systematically evaluating successful newborn transitional physiology at birth was the Apgar Score, devised by Virginia Apgar in 1953. This objective assessment tool allowed clinicians to immediately gauge the relative success of a newborn infant making the transition from the in utero liquid immersive environment to the ex utero gas environment in the delivery room during the first minutes after birth. The scoring system, although eponymous, is generally summarized as an acronym based on Appearance, Pulse, Grimace, Activity, and Respiration, criteria evaluated and scored at 1 and 5 min after birth. This common clinical appraisal is a guide for determining the elements of integrated physiology involved as the infant makes the transition from a "sea water" environment of 3% oxygen to a "land" environment in 21% oxygen. Appearance determines the perfusion of the skin with oxygenated blood-turning it pink; Pulse is the rate of heart beat, reflecting successful oxygen delivery to organs; Grimace, or irritability, is a functional marker for nervous system integration; Activity represents locomotor capacity; and, of course, Respiration represents pulmonary function as well as the successful neuro-feedback-mediated drive to breathe, supplying oxygen by inspiring atmospheric gas. Respiration, locomotion, and metabolism are fundamental processes adapted for vertebrate evolution from a water-based to an atmosphere-based life and are reflected by the Apgar Score. These physiologic processes last underwent major phylogenetic changes during the water-land transition some 300-400 million years ago, during which specific gene duplications occurred that facilitated terrestrial adaptation, in particular the parathyroid hormone-related protein receptor, the β-adrenergic receptor, and the glucocorticoid receptor. All these genetic traits and the gene regulatory networks they comprise represent the foundational substructure of the Apgar Score. As such, these molecular elements can be examined using a Molecular Apgar evaluation of keystone evolutionary events that predict successful evolutionary adaptation of physiologic functions necessary for neonatal transition and survival.
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Affiliation(s)
- John S Torday
- Pediatrics, Harbor - UCLA Medical Center , Torrance, CA , USA
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The biology of the ABCA3 lipid transporter in lung health and disease. Cell Tissue Res 2016; 367:481-493. [PMID: 28025703 DOI: 10.1007/s00441-016-2554-z] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 11/29/2016] [Indexed: 01/10/2023]
Abstract
The lipid transporter, ATP-binding cassette class A3 (ABCA3), is a highly conserved multi-membrane-spanning protein that plays a critical role in the regulation of pulmonary surfactant homeostasis. Mutations in ABCA3 have been increasingly recognized as one of the causes of inherited pulmonary diseases. These monogenic disorders produce familial lung abnormalities with pathological presentations ranging from neonatal surfactant-deficiency-induced respiratory failure to childhood or adult diffuse parenchymal lung diseases for which specific treatment modalities remain limited. More than 200 ABCA3 mutations have been reported to date with approximately three quarters of patients presenting as compound heterozygotes. Recent advances in our understanding of the molecular basis underlying normal ABCA3 biosynthesis and processing and of the mechanisms of alveolar epithelial cell dysregulation caused by the expression of its mutant forms are beginning to emerge. These insights and the role of environmental factors and modifier genes are discussed in the context of the considerable variability in disease presentation observed in patients with identical ABCA3 gene mutations. Moreover, the opportunities afforded by an enhanced understanding of ABCA3 biology for targeted therapeutic strategies are addressed.
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Knudsen L, Ruppert C, Ochs M. Tissue remodelling in pulmonary fibrosis. Cell Tissue Res 2016; 367:607-626. [PMID: 27981380 DOI: 10.1007/s00441-016-2543-2] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 11/19/2016] [Indexed: 12/16/2022]
Abstract
Many lung diseases result in fibrotic remodelling. Fibrotic lung disorders can be divided into diseases with known and unknown aetiology. Among those with unknown aetiology, idiopathic pulmonary fibrosis (IPF) is a common diagnosis. Because of its progressive character leading to a rapid decline in lung function, it is a fatal disease with poor prognosis and limited therapeutic options. Thus, IPF has motivated many studies in the last few decades in order to increase our mechanistic understanding of the pathogenesis of the disease. The current concept suggests an ongoing injury of the alveolar epithelium, an impaired regeneration capacity, alveolar collapse and, finally, a fibroproliferative response. The origin of lung injury remains elusive but a diversity of factors, which will be discussed in this article, has been shown to be associated with IPF. Alveolar epithelial type II (AE2) cells play a key role in lung fibrosis and their crucial role for epithelial regeneration, stabilisation of alveoli and interaction with fibroblasts, all known to be responsible for collagen deposition, will be illustrated. Whereas mechanisms of collagen deposition and fibroproliferation are the focus of many studies in the field, the awareness of other mechanisms in this disease is currently limited to biochemical and imaging studies including quantitative assessments of lung structure in IPF and animal models assigning alveolar collapse and collapse induration crucial roles for the degradation of the lung resulting in de-aeration and loss of surface area. Dysfunctional AE2 cells, instable alveoli and mechanical stress trigger remodelling that consists of collapsed alveoli absorbed by fibrotic tissue (i.e., collapse induration).
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Affiliation(s)
- Lars Knudsen
- Institute of Functional and Applied Anatomy, Hannover Medical School, Carl-Neuberg Strasse 1, 30625, 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. .,REBIRTH, Cluster of Excellence, Hannover Medical School, Hannover, Germany.
| | - Clemens Ruppert
- Department of Internal Medicine, Justus-Liebig-University Giessen, Giessen, Germany.,Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Universities of Giessen and Marburg, Giessen, Germany
| | - Matthias Ochs
- Institute of Functional and Applied Anatomy, Hannover Medical School, Carl-Neuberg Strasse 1, 30625, 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.,REBIRTH, Cluster of Excellence, Hannover Medical School, Hannover, Germany
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Frixel S, Lotz-Havla AS, Kern S, Kaltenborn E, Wittmann T, Gersting SW, Muntau AC, Zarbock R, Griese M. Homooligomerization of ABCA3 and its functional significance. Int J Mol Med 2016; 38:558-66. [PMID: 27352740 DOI: 10.3892/ijmm.2016.2650] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 05/11/2016] [Indexed: 11/06/2022] Open
Abstract
ABCA3 is a surfactant lipid transporter in the limiting membrane of lamellar bodies in alveolar type II cells. Mutations in the ATP-binding cassette, sub-family A (ABC1), member 3 (ABCA3) gene cause respiratory distress syndrome in newborns, and chronic interstitial lung disease in children and adults. ABCA3 belongs to the class of full ABC transporters, which are supposed to be functional in their monomeric forms. Although other family members e.g., ABCA1 and ABCC7 have been shown to function as oligomers, the oligomerization state of ABCA3 is unknown. In the present study, the oligomerization of ABCA3 was investigated in cell lysates and crude membrane preparations from transiently and stably transfected 293 cells using blue native PAGE (BN-PAGE), gel filtration and co-immunoprecipitation. Additionally, homooligomerization was examined in vivo in cells using bioluminescence resonance energy transfer (BRET). Using BN-PAGE and gel filtration, we demonstrate that non-denatured ABCA3 exists in different oligomeric forms, with monomers (45%) and tetramers (30%) being the most abundant forms. Furthermore, we also show the existence of 20% dimers and 5% trimers. BRET analyses verified intermolecular interactions in vivo. Our results also demonstrated that the arrest of ABCA3 in the endoplasmic reticulum (ER), either through drug treatment or induced by mutations in ABCA3, inhibited the propensity of the protein to form dimers. Based on our results, we suggest that transporter oligomerization is crucial for ABCA3 function and that a disruption of oligomerization due to mutations represents a novel pathomechanism in ABCA3-associated lung disease.
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Affiliation(s)
- Sabrina Frixel
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Amelie S Lotz-Havla
- Department of Molecular Pediatrics, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Sunčana Kern
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Eva Kaltenborn
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Thomas Wittmann
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Søren W Gersting
- Department of Molecular Pediatrics, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Ania C Muntau
- University Children's Hospital, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | - Ralf Zarbock
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Matthias Griese
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
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Nutrient shortage triggers the hexosamine biosynthetic pathway via the GCN2-ATF4 signalling pathway. Sci Rep 2016; 6:27278. [PMID: 27255611 PMCID: PMC4891703 DOI: 10.1038/srep27278] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 05/17/2016] [Indexed: 12/22/2022] Open
Abstract
The hexosamine biosynthetic pathway (HBP) is a nutrient-sensing metabolic pathway that produces the activated amino sugar UDP-N-acetylglucosamine, a critical substrate for protein glycosylation. Despite its biological significance, little is known about the regulation of HBP flux during nutrient limitation. Here, we report that amino acid or glucose shortage increase GFAT1 production, the first and rate-limiting enzyme of the HBP. GFAT1 is a transcriptional target of the activating transcription factor 4 (ATF4) induced by the GCN2-eIF2α signalling pathway. The increased production of GFAT1 stimulates HBP flux and results in an increase in O-linked β-N-acetylglucosamine protein modifications. Taken together, these findings demonstrate that ATF4 provides a link between nutritional stress and the HBP for the regulation of the O-GlcNAcylation-dependent cellular signalling.
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Rezaei F, Shafiei M, Shariati G, Dehdashtian A, Mohebbi M, Galehdari H. Novel Mutation in the ATP-Binding Cassette Transporter A3 (ABCA3) Encoding Gene Causes Respiratory Distress Syndrome in A Term Newborn in Southwest Iran. IRANIAN JOURNAL OF PEDIATRICS 2016; 26:e2493. [PMID: 27437095 PMCID: PMC4939234 DOI: 10.5812/ijp.2493] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Revised: 11/01/2015] [Accepted: 11/14/2015] [Indexed: 11/16/2022]
Abstract
INTRODUCTION ABCA3 glycoprotein belongs to the ATP-binding cassette (ABC) superfamily of transporters, which utilize the energy derived from hydrolysis of ATP for the translocation of a wide variety of substrates across the plasma membrane. Mutations in the ABCA3 gene are knowingly causative for fatal surfactant deficiency, particularly respiratory distress syndrome (RDS) in term babies. CASE PRESENTATION In this study, Sanger sequencing of the whole ABCA3 gene (NCBI NM_001089) was performed in a neonatal boy with severe RDS. A homozygous mutation has been identified in the patient. Parents were heterozygous for the same missense mutation GGA > AGA at position 202 in exon 6 of the ABCA3 gene (c.604G > A; p.G202R). Furthermore, 70 normal individuals have been analyzed for the mentioned change with negative results. CONCLUSIONS Regarding Human Genome Mutation Database (HGMD) and other literature recherche, the detected change is a novel mutation and has not been reported before. Bioinformatics mutation predicting tools prefer it as pathogenic.
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Affiliation(s)
- Farideh Rezaei
- Deptartment of Genetics, Faculty of Science, Shahid Chamran University, Ahvaz, IR Iran
| | - Mohammad Shafiei
- Deptartment of Genetics, Faculty of Science, Shahid Chamran University, Ahvaz, IR Iran
| | - Gholamreza Shariati
- Narges Medical Genetic Laboratory, Ahvaz, IR Iran
- Jundishapur University of Medical Sciences, Ahvaz, IR Iran
| | | | - Maryam Mohebbi
- Narges Medical Genetic Laboratory, Ahvaz, IR Iran
- Jundishapur University of Medical Sciences, Ahvaz, IR Iran
- Corresponding author: Maryam Mohebbi, Jundishapur University of Medical Sciences, Ahvaz, IR Iran. Tel: +98-9126433468, E-mail:
| | - Hamid Galehdari
- Deptartment of Genetics, Faculty of Science, Shahid Chamran University, Ahvaz, IR Iran
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Wittmann T, Frixel S, Höppner S, Schindlbeck U, Schams A, Kappler M, Hegermann J, Wrede C, Liebisch G, Vierzig A, Zacharasiewicz A, Kopp MV, Poets CF, Baden W, Hartl D, van Kaam AH, Lohse P, Aslanidis C, Zarbock R, Griese M. Increased Risk of Interstitial Lung Disease in Children with a Single R288K Variant of ABCA3. Mol Med 2016; 22:183-191. [PMID: 26928390 DOI: 10.2119/molmed.2015.00244] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Accepted: 02/17/2016] [Indexed: 11/06/2022] Open
Abstract
The ABCA3 gene encodes a lipid transporter in type II pneumocytes critical for survival and normal respiratory function. The frequent ABCA3 variant R288K increases the risk for neonatal respiratory distress syndrome among term and late preterm neonates, but its role in children's interstitial lung disease has not been studied in detail. In a retrospective cohort study of 228 children with interstitial lung disease related to the alveolar surfactant system, the frequency of R288K was assessed and the phenotype of patients carrying a single R288K variant further characterized by clinical course, lung histology, computed tomography and bronchoalveolar lavage phosphatidylcholine PC 32:0. Cell lines stably transfected with ABCA3-R288K were analyzed for intracellular transcription, processing and targeting of the protein. ABCA3 function was assessed by detoxification assay of doxorubicin, and the induction and volume of lamellar bodies. We found nine children with interstitial lung disease carrying a heterozygous R288K variant, a frequency significantly higher than in the general Caucasian population. All identified patients had neonatal respiratory insufficiency, recovered and developed chronic interstitial lung disease with intermittent exacerbations during early childhood. In vitro analysis showed normal transcription, processing, and targeting of ABCA3-R288K, but impaired detoxification function and smaller lamellar bodies. We propose that the R288K variant can underlie interstitial lung disease in childhood due to reduced function of ABCA3, demonstrated by decelerated detoxification of doxorubicin, reduced PC 32:0 content and decreased lamellar body volume.
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Affiliation(s)
- Thomas Wittmann
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Lung Research Center (DZL), Munich, Germany
| | - Sabrina Frixel
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Lung Research Center (DZL), Munich, Germany
| | - Stefanie Höppner
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Lung Research Center (DZL), Munich, Germany
| | - Ulrike Schindlbeck
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Lung Research Center (DZL), Munich, Germany
| | - Andrea Schams
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Lung Research Center (DZL), Munich, Germany
| | - Matthias Kappler
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Lung Research Center (DZL), Munich, Germany
| | - Jan Hegermann
- Institute of Functional and Applied Anatomy, Hannover Medical School, German Lung Research Center (DZL), Hannover, Germany
| | - Christoph Wrede
- Institute of Functional and Applied Anatomy, Hannover Medical School, German Lung Research Center (DZL), Hannover, Germany
| | - Gerhard Liebisch
- Institute for Clinical Chemistry and Laboratory Medicine, University of Regensburg, Regensburg, Germany
| | - Anne Vierzig
- Paediatric Intensive Care, University Children's Hospital, University of Cologne, Cologne, Germany
| | | | - Matthias Volkmar Kopp
- Department of Pediatric Allergy and Pulmonology, University Löbeck, Airway Research Center North (ARCN), Löbeck, Germany
| | | | - Winfried Baden
- Children's Hospital, University of Töbingen, Töbingen, Germany
| | - Dominik Hartl
- Children's Hospital, University of Töbingen, Töbingen, Germany
| | - Anton H van Kaam
- Department of Neonatology, Emma Children's Hospital, Academic Medical Center, Amsterdam, The Netherlands
| | | | - Charalampos Aslanidis
- Institute for Clinical Chemistry and Laboratory Medicine, University of Regensburg, Regensburg, Germany
| | - Ralf Zarbock
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Lung Research Center (DZL), Munich, Germany
| | - Matthias Griese
- Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, German Lung Research Center (DZL), Munich, Germany
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Korfei M, Ruppert C, Loeh B, Mahavadi P, Guenther A. The role of Endoplasmic Reticulum (ER) stress in pulmonary fibrosis. ENDOPLASMIC RETICULUM STRESS IN DISEASES 2016. [DOI: 10.1515/ersc-2016-0002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
AbstractThe activation of Endoplasmic Reticulum (ER) stress and Unfolded Protein Response (UPR) was first observed in patients with familial interstitial pneumonia (FIP) carrying mutations in the C-terminal BRICHOS domain of surfactant protein C (SFTPC). Here, aggresome formation and severe ER stress was demonstrated in type-II alveolar epithelial cells (AECII), which specifically express this very hydrophobic surfactant protein. In subsequent studies, FIP-patients with mutations in the gene encoding surfactant protein A2 (SFTPA2) were discovered, whose overexpression in epithelial cells in vitro also resulted in significant induction of ER stress. Moreover, prominent ER stress in AECII was also observed in FIP-patients not carrying the SFTPC/SFTPA2 mutations, as well as in patients with the more common sporadic forms of IP. Additionally, cases of adult-onset FIP with mutations in Telomerase genes and other telomereassociated components were reported. These mutations were associated with telomere shortening, which is a potential cause for triggering a persistent DNA damage response and replicative senescence in affected cells. Moreover, shortened telomeres were observed directly in the AECII of FIP-patients, and even sporadic IP cases, in the absence of any gene mutations. Here, we try to figure out the possible origins of ER stress in sporadic IP cases and non-SFTPC/SFTPA2-associated FIP.
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Jiang DS, Yi X, Huo B, Liu XX, Li R, Zhu XH, Wei X. The potential role of lysosome-associated membrane protein 3 (LAMP3) on cardiac remodelling. Am J Transl Res 2016; 8:37-48. [PMID: 27069538 PMCID: PMC4759414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 01/02/2016] [Indexed: 06/05/2023]
Abstract
Lysosome-associated membrane protein 3 (LAMP3) was first identified as a cell surface marker of mature dendritic cells and specifically expressed in lung tissues. Recently studies demonstrated that LAMP3 plays a critical role in several cancers, and regulated by hypoxia. However, whether LAMP3 expressed in the heart and cardiomyocytes and changed its expression level in the hearts with cardiac remodelling was largely unknown. In this study, we first cultured H9C2 (a clonal muscle cell line from rat heart) and stimulated with 1 μM angiotensin II (Ang II), or 100 μM isoproterenol (ISO), or 100 μM phenylephrine (PE) for indicated times. We found that LAMP3 expression level was significantly increased after these stimulation. Next, the pressure overload-induced cardiac remodelling mouse model was performed in the wild type C57BL/6J mice. After 4 and 8 weeks of transverse aortic constriction (TAC), obvious cardiac remodelling was observed in the wild type mice compared with sham group. Importantly, LAMP3 expression level was gradually elevated from 2 weeks to 8 weeks after TAC surgery. Furthermore, in human dilated cardiomyopathy (DCM) hearts, severe cardiac remodelling was observed, as evidenced by remarkably increased cardiomyocytes cross sectional area and collagen deposition. Notably, the mRNA and protein level of LAMP3 were significantly increased in the DCM hearts compared with donor hearts. Immunohistochemistry assay showed that LAMP3 was expression in the cardiomyocytes and responsible for its increased expression in the hearts. Our data indicated that LAMP3 might have a potential role in the process of cardiac remodelling.
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Affiliation(s)
- Ding-Sheng Jiang
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Heart-Lung Transplantation Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Sino-Swiss Heart-Lung Transplantation Institute, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Xin Yi
- Department of Cardiology, Renmin Hospital of Wuhan UniversityWuhan 430060, China
- Cardiovascular Research Institute, Wuhan UniversityWuhan 430060, China
| | - Bo Huo
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Heart-Lung Transplantation Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Sino-Swiss Heart-Lung Transplantation Institute, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Xin-Xin Liu
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Heart-Lung Transplantation Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Sino-Swiss Heart-Lung Transplantation Institute, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Rui Li
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Heart-Lung Transplantation Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Sino-Swiss Heart-Lung Transplantation Institute, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Xue-Hai Zhu
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Heart-Lung Transplantation Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Sino-Swiss Heart-Lung Transplantation Institute, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Xiang Wei
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Heart-Lung Transplantation Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
- Sino-Swiss Heart-Lung Transplantation Institute, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
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Understanding Idiopathic Interstitial Pneumonia: A Gene-Based Review of Stressed Lungs. BIOMED RESEARCH INTERNATIONAL 2015; 2015:304186. [PMID: 26539479 PMCID: PMC4619788 DOI: 10.1155/2015/304186] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 08/26/2015] [Indexed: 12/17/2022]
Abstract
Pulmonary fibrosis is the main cause of severe morbidity and mortality in idiopathic interstitial pneumonias (IIP). In the past years, there has been major progress in the discovery of genetic factors that contribute to disease. Genes with highly penetrant mutations or strongly predisposing common risk alleles have been identified in familial and sporadic IIP. This review summarizes genes harbouring causative rare mutations and replicated common predisposing alleles. To date, rare mutations in nine different genes and five risk alleles fulfil this criterion. Mutated genes represent three genes involved in surfactant homeostasis and six genes involved in telomere maintenance. We summarize gene function, gene expressing cells, and pathological consequences of genetic alterations associated with disease. Consequences of the genetic alteration include dysfunctional surfactant processing, ER stress, immune dysregulation, and maintenance of telomere length. Biological evidence shows that these processes point towards a central role for alveolar epithelial type II cell dysfunction. However, tabulation also shows that function and consequence of most common risk alleles are not known. Most importantly, the predisposition of the MUC5B risk allele to disease is not understood. We propose a mechanism whereby MUC5B decreases surface tension lowering capacity of alveolar surfactant at areas with maximal mechanical stress.
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ABCA3, a key player in neonatal respiratory transition and genetic disorders of the surfactant system. Biochem Soc Trans 2015; 43:913-9. [DOI: 10.1042/bst20150100] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Genetic disorders of the surfactant system are rare diseases with a broad range of clinical manifestations, from fatal respiratory distress syndrome (RDS) in neonates to chronic interstitial lung disease (ILD) in children and adults. ABCA3 [ATP-binding cassette (ABC), subfamily A, member 3] is a lung-specific phospholipid transporter critical for intracellular surfactant synthesis and storage in lamellar bodies (LBs). Its expression is developmentally regulated, peaking prior to birth under the influence of steroids and transcription factors. Bi-allelic mutations of the ABCA3 gene represent the most frequent cause of congenital surfactant deficiency, indicating its critical role in lung function. Mutations affect surfactant lipid and protein processing and LBs’ morphology, leading to partial or total surfactant deficiency. Approximately 200 mutations have been reported, most of which are unique to individuals and families, which makes diagnosis and prognosis challenging. Various types of mutations, affecting different domains of the protein, account in part for phenotype diversity. Disease-causing mutations have been reported in most coding and some non-coding regions of the gene, but tend to cluster in the first extracellular loop and the second nucleotide-binding domain (NBD), leading to defective glycosylation and trafficking defects and interfering with ATP binding and hydrolysis respectively. Mono-allelic damaging and benign variants are often subclinical but may act as disease modifiers in lung diseases such as RDS of prematurity or associate with mutations in other surfactant-related genes. Diagnosis is complex but essential and should combine pathology and ultrastructure studies on lung biopsy with broad-spectrum genetic testing of surfactant-related genes, made possible by recent technology advances in the massive parallel sequencing technology.
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Mulugeta S, Nureki SI, Beers MF. Lost after translation: insights from pulmonary surfactant for understanding the role of alveolar epithelial dysfunction and cellular quality control in fibrotic lung disease. Am J Physiol Lung Cell Mol Physiol 2015; 309:L507-25. [PMID: 26186947 PMCID: PMC4572416 DOI: 10.1152/ajplung.00139.2015] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 07/10/2015] [Indexed: 01/08/2023] Open
Abstract
Dating back nearly 35 years ago to the Witschi hypothesis, epithelial cell dysfunction and abnormal wound healing have reemerged as central concepts in the pathophysiology of idiopathic pulmonary fibrosis (IPF) in adults and in interstitial lung disease in children. Alveolar type 2 (AT2) cells represent a metabolically active compartment in the distal air spaces responsible for pulmonary surfactant biosynthesis and function as a progenitor population required for maintenance of alveolar integrity. Rare mutations in surfactant system components have provided new clues to understanding broader questions regarding the role of AT2 cell dysfunction in the pathophysiology of fibrotic lung diseases. Drawing on data generated from a variety of model systems expressing disease-related surfactant component mutations [surfactant proteins A and C (SP-A and SP-C); the lipid transporter ABCA3], this review will examine the concept of epithelial dysfunction in fibrotic lung disease, provide an update on AT2 cell and surfactant biology, summarize cellular responses to mutant surfactant components [including endoplasmic reticulum (ER) stress, mitochondrial dysfunction, and intrinsic apoptosis], and examine quality control pathways (unfolded protein response, the ubiquitin-proteasome system, macroautophagy) that can be utilized to restore AT2 homeostasis. This integrated response and its derangement will be placed in the context of cell stress and quality control signatures found in patients with familial or sporadic IPF as well as non-surfactant-related AT2 cell dysfunction syndromes associated with a fibrotic lung phenotype. Finally, the need for targeted therapeutic strategies for pulmonary fibrosis that address epithelial ER stress, its downstream signaling, and cell quality control are discussed.
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Affiliation(s)
- Surafel Mulugeta
- Pulmonary, Allergy, and Critical Care Division; Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania; and
| | - Shin-Ichi Nureki
- Department of Respiratory Medicine and Infectious Diseases, Oita University, Yufu, Oita, Japan
| | - Michael F Beers
- Pulmonary, Allergy, and Critical Care Division; Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania; and
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Whitsett JA, Wert SE, Weaver TE. Diseases of pulmonary surfactant homeostasis. ANNUAL REVIEW OF PATHOLOGY-MECHANISMS OF DISEASE 2015; 10:371-93. [PMID: 25621661 DOI: 10.1146/annurev-pathol-012513-104644] [Citation(s) in RCA: 152] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Advances in physiology and biochemistry have provided fundamental insights into the role of pulmonary surfactant in the pathogenesis and treatment of preterm infants with respiratory distress syndrome. Identification of the surfactant proteins, lipid transporters, and transcriptional networks regulating their expression has provided the tools and insights needed to discern the molecular and cellular processes regulating the production and function of pulmonary surfactant prior to and after birth. Mutations in genes regulating surfactant homeostasis have been associated with severe lung disease in neonates and older infants. Biophysical and transgenic mouse models have provided insight into the mechanisms underlying surfactant protein and alveolar homeostasis. These studies have provided the framework for understanding the structure and function of pulmonary surfactant, which has informed understanding of the pathogenesis of diverse pulmonary disorders previously considered idiopathic. This review considers the pulmonary surfactant system and the genetic causes of acute and chronic lung disease caused by disruption of alveolar homeostasis.
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Affiliation(s)
- Jeffrey A Whitsett
- Divisions of Neonatology, Perinatal Biology, and Pulmonary Biology, Perinatal Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229; , ,
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Rudashevskaya EL, Stockner T, Trauner M, Freissmuth M, Chiba P. Pharmacological correction of misfolding of ABC proteins. DRUG DISCOVERY TODAY. TECHNOLOGIES 2015; 12:e87-94. [PMID: 25027379 PMCID: PMC4039138 DOI: 10.1016/j.ddtec.2014.03.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The endoplasmic reticulum (ER) quality control system distinguishes between correctly and incorrectly folded proteins to prevent processing of aberrantly folded conformations along the secretory pathway. Non-synonymous mutations can lead to misfolding of ABC proteins and associated disease phenotypes. Specific phenotypes may at least partially be corrected by small molecules, so-called pharmacological chaperones. Screening for folding correctors is expected to open an avenue for treatment of diseases such as cystic fibrosis and intrahepatic cholestasis.
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Affiliation(s)
- Elena L Rudashevskaya
- Institute of Medical Chemistry, Medical University of Vienna, Waehringerstrasse 10, Vienna, Austria
| | - Thomas Stockner
- Institute of Pharmacology, Medical University of Vienna, Waehringerstrasse 13, Vienna, Austria
| | - Michael Trauner
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, Austria
| | - Michael Freissmuth
- Institute of Pharmacology, Medical University of Vienna, Waehringerstrasse 13, Vienna, Austria
| | - Peter Chiba
- Institute of Medical Chemistry, Medical University of Vienna, Waehringerstrasse 10, Vienna, Austria
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Jackson T, Wegner DJ, White FV, Hamvas A, Cole FS, Wambach JA. Respiratory failure in a term infant with cis and trans mutations in ABCA3. J Perinatol 2015; 35:231-2. [PMID: 25712598 PMCID: PMC4341920 DOI: 10.1038/jp.2014.236] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 12/01/2014] [Accepted: 12/03/2014] [Indexed: 11/09/2022]
Abstract
A full-term female neonate presented with persistent respiratory failure and radiologic studies consistent with surfactant deficiency. Sequencing of the ATP-binding cassette transporter A3 gene (ABCA3) revealed three mutations: R280C, V1399M and Q1589X. The infant underwent bilateral lung transplantation at 9 months of age and is alive at 3 years of age. Parental sequencing demonstrated that two of the mutations (R280C and Q1589X) were oriented on the same allele (cis), whereas V1399M was oriented on the opposite allele (trans). As more than one mutation in ABCA3 can be present on the same allele, parental studies are needed to determine allelic orientation to inform clinical decision making and future reproductive counseling.
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Affiliation(s)
- Tara Jackson
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
| | - Daniel J. Wegner
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
| | - Frances V. White
- Department of Pathology, Washington University School of Medicine, St. Louis, MO, USA
| | - Aaron Hamvas
- Department of Pediatrics, Northwestern University School of Medicine, Chicago, IL, USA
| | - F. Sessions Cole
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
| | - Jennifer A. Wambach
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
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Griese M, Kirmeier HG, Liebisch G, Rauch D, Stückler F, Schmitz G, Zarbock R. Surfactant lipidomics in healthy children and childhood interstitial lung disease. PLoS One 2015; 10:e0117985. [PMID: 25692779 PMCID: PMC4333572 DOI: 10.1371/journal.pone.0117985] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 01/06/2015] [Indexed: 11/19/2022] Open
Abstract
Background Lipids account for the majority of pulmonary surfactant, which is essential for normal breathing. We asked if interstitial lung diseases (ILD) in children may disrupt alveolar surfactant and give clues for disease categorization. Methods Comprehensive lipidomics profiles of broncho-alveolar lavage fluid were generated in 115 children by electrospray ionization tandem mass spectrometry (ESI-MS/MS). Two reference populations were compared to a broad range of children with ILD. Results Class and species composition in healthy children did not differ from that in children with ILD related to diffuse developmental disorders, chronic tachypnoe of infancy, ILD related to lung vessels and the heart, and ILD related to reactive lymphoid lesions. As groups, ILDs related to the alveolar surfactant region, ILD related to unclear respiratory distress syndrome in the mature neonate, or in part ILD related to growth abnormalities reflecting deficient alveolarisation, had significant alterations of some surfactant specific phospholipids. Additionally, lipids derived from inflammatory processes were identified and differentiated. In children with ABCA3-deficiency from two ILD causing mutations saturated and monounsaturated phosphatidylcholine species with 30 and 32 carbons and almost all phosphatidylglycerol species were severely reduced. In other alveolar disorders lipidomic profiles may be of less diagnostic value, but nevertheless may substantiate lack of significant involvement of mechanisms related to surfactant lipid metabolism. Conclusions Lipidomic profiling may identify specific forms of ILD in children with surfactant alterations and characterized the molecular species pattern likely to be transported by ABCA3 in vivo.
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Affiliation(s)
- Matthias Griese
- Department of Pediatric Pulmonology, Hauner Children’s Hospital, Ludwig Maximilians University, Member of the German Center for Lung Research (DZL), Lindwurmstr. 4a, D-80337 Munich, Germany
- * E-mail:
| | - Hannah G. Kirmeier
- Department of Pediatric Pulmonology, Hauner Children’s Hospital, Ludwig Maximilians University, Member of the German Center for Lung Research (DZL), Lindwurmstr. 4a, D-80337 Munich, Germany
| | - Gerhard Liebisch
- Institute of Computational Biology, Helmholtz Center Munich, Neuherberg, Germany
| | - Daniela Rauch
- Department of Pediatric Pulmonology, Hauner Children’s Hospital, Ludwig Maximilians University, Member of the German Center for Lung Research (DZL), Lindwurmstr. 4a, D-80337 Munich, Germany
| | - Ferdinand Stückler
- Institute of Computational Biology, Helmholtz Center Munich, Neuherberg, Germany
| | - Gerd Schmitz
- Institute of Clinical Chemistry and Laboratory Medicine, University of Regensburg, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany
| | - Ralf Zarbock
- Department of Pediatric Pulmonology, Hauner Children’s Hospital, Ludwig Maximilians University, Member of the German Center for Lung Research (DZL), Lindwurmstr. 4a, D-80337 Munich, Germany
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Analysis of TGF-β1- and drug-induced epithelial-mesenchymal transition in cultured alveolar epithelial cell line RLE/Abca3. Drug Metab Pharmacokinet 2014; 30:111-8. [PMID: 25760538 DOI: 10.1016/j.dmpk.2014.10.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 09/06/2014] [Accepted: 10/13/2014] [Indexed: 12/19/2022]
Abstract
In this study, we examined the induction of epithelial-mesenchymal transition (EMT) by transforming growth factor (TGF)-β1 and drugs in genetically engineered type II alveolar epithelial cell line RLE/Abca3. Treatment of RLE/Abca3 cells with TGF-β1 induced marked changes in cell morphology from epithelial-like to elongated fibroblast-like morphology. With these morphological changes, mRNA expression of epithelial markers such as cytokeratin 19 (CK19) decreased, while that of mesenchymal markers such as α-smooth muscle actin (α-SMA) increased. TGF-β1 treatment also decreased the mRNA expression of Abca3, a type II cell marker, and formation of lamellar body structures. Interestingly, the effect of TGF-β1 on Abca3 mRNA expression was observed in RLE/Abca3 cells, but not in wild-type RLE-6TN, A549, and H441 cells. Treatment of RLE/Abca3 cells with bleomycin (BLM) and methotrexate (MTX) induced similar morphological and mRNA expression changes. In addition, the increase in α-SMA and the decrease in Abca3 mRNA expression by these drugs were observed only in RLE/Abca3 cells. These findings suggest that, like TGF-β1, BLM and MTX induce EMT in RLE/Abca3 cells, and RLE/Abca3 cells would be a good model to study drug-induced EMT. The effect of pirfenidone, an antifibrotic and anti-inflammatory drug, on EMT induced by TGF-β1 was also discussed.
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