1
|
Raslan AA, Oh YJ, Jin YR, Yoon JK. R-Spondin2, a Positive Canonical WNT Signaling Regulator, Controls the Expansion and Differentiation of Distal Lung Epithelial Stem/Progenitor Cells in Mice. Int J Mol Sci 2022; 23:ijms23063089. [PMID: 35328508 PMCID: PMC8954098 DOI: 10.3390/ijms23063089] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/10/2022] [Accepted: 03/10/2022] [Indexed: 02/04/2023] Open
Abstract
The lungs have a remarkable ability to regenerate damaged tissues caused by acute injury. Many lung diseases, especially chronic lung diseases, are associated with a reduced or disrupted regeneration potential of the lungs. Therefore, understanding the underlying mechanisms of the regenerative capacity of the lungs offers the potential to identify novel therapeutic targets for these diseases. R-spondin2, a co-activator of WNT/β-catenin signaling, plays an important role in embryonic murine lung development. However, the role of Rspo2 in adult lung homeostasis and regeneration remains unknown. The aim of this study is to determine Rspo2 function in distal lung stem/progenitor cells and adult lung regeneration. In this study, we found that robust Rspo2 expression was detected in different epithelial cells, including airway club cells and alveolar type 2 (AT2) cells in the adult lungs. However, Rspo2 expression significantly decreased during the first week after naphthalene-induced airway injury and was restored by day 14 post-injury. In ex vivo 3D organoid culture, recombinant RSPO2 promoted the colony formation and differentiation of both club and AT2 cells through the activation of canonical WNT signaling. In contrast, Rspo2 ablation in club and AT2 cells significantly disrupted their expansion capacity in the ex vivo 3D organoid culture. Furthermore, mice lacking Rspo2 showed significant defects in airway regeneration after naphthalene-induced injury. Our results strongly suggest that RSPO2 plays a key role in the adult lung epithelial stem/progenitor cells during homeostasis and regeneration, and therefore, it may be a potential therapeutic target for chronic lung diseases with reduced regenerative capability.
Collapse
Affiliation(s)
- Ahmed A. Raslan
- Department of Integrated Biomedical Science, Graduate School, Soonchunhyang University, 25 Bongjeong-ro, Dongnam-gu, Cheonan 31151, Korea;
- Soonchunhyang Institute of Medi-Bio Science, Soonchunhyang University, 25 Bongjeong-ro, Dongnam-gu, Cheonan 31151, Korea;
| | - Youn Jeong Oh
- Soonchunhyang Institute of Medi-Bio Science, Soonchunhyang University, 25 Bongjeong-ro, Dongnam-gu, Cheonan 31151, Korea;
| | - Yong Ri Jin
- Center for Molecular Medicine, Maine Medical Center Research Institute, 81 Research Drive, Scarborough, ME 04074, USA;
| | - Jeong Kyo Yoon
- Department of Integrated Biomedical Science, Graduate School, Soonchunhyang University, 25 Bongjeong-ro, Dongnam-gu, Cheonan 31151, Korea;
- Soonchunhyang Institute of Medi-Bio Science, Soonchunhyang University, 25 Bongjeong-ro, Dongnam-gu, Cheonan 31151, Korea;
- Correspondence:
| |
Collapse
|
2
|
Walentek P. Signaling Control of Mucociliary Epithelia: Stem Cells, Cell Fates, and the Plasticity of Cell Identity in Development and Disease. Cells Tissues Organs 2022; 211:736-753. [PMID: 33902038 PMCID: PMC8546001 DOI: 10.1159/000514579] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 01/19/2021] [Indexed: 01/25/2023] Open
Abstract
Mucociliary epithelia are composed of multiciliated, secretory, and stem cells and line various organs in vertebrates such as the respiratory tract. By means of mucociliary clearance, those epithelia provide a first line of defense against inhaled particles and pathogens. Mucociliary clearance relies on the correct composition of cell types, that is, the proper balance of ciliated and secretory cells. A failure to generate and to maintain correct cell type composition and function results in impaired clearance and high risk to infections, such as in congenital diseases (e.g., ciliopathies) as well as in acquired diseases, including asthma, chronic obstructive pulmonary disease (COPD), and idiopathic pulmonary fibrosis (IPF). While it remains incompletely resolved how precisely cell types are specified and maintained in development and disease, many studies have revealed important mechanisms regarding the signaling control in mucociliary cell types in various species. Those studies not only provided insights into the signaling contribution to organ development and regeneration but also highlighted the remarkable plasticity of cell identity encountered in mucociliary maintenance, including frequent trans-differentiation events during homeostasis and specifically in disease. This review will summarize major findings and provide perspectives regarding the future of mucociliary research and the treatment of chronic airway diseases associated with tissue remodeling.
Collapse
Affiliation(s)
- Peter Walentek
- Renal Division, Department of Medicine, University Hospital Freiburg, Freiburg University Faculty of Medicine, Freiburg, Germany.,CIBSS - Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| |
Collapse
|
3
|
Aros CJ, Pantoja CJ, Gomperts BN. Wnt signaling in lung development, regeneration, and disease progression. Commun Biol 2021; 4:601. [PMID: 34017045 PMCID: PMC8138018 DOI: 10.1038/s42003-021-02118-w] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 03/26/2021] [Indexed: 12/12/2022] Open
Abstract
The respiratory tract is a vital, intricate system for several important biological processes including mucociliary clearance, airway conductance, and gas exchange. The Wnt signaling pathway plays several crucial and indispensable roles across lung biology in multiple contexts. This review highlights the progress made in characterizing the role of Wnt signaling across several disciplines in lung biology, including development, homeostasis, regeneration following injury, in vitro directed differentiation efforts, and disease progression. We further note uncharted directions in the field that may illuminate important biology. The discoveries made collectively advance our understanding of Wnt signaling in lung biology and have the potential to inform therapeutic advancements for lung diseases. Cody Aros, Carla Pantoja, and Brigitte Gomperts review the key role of Wnt signaling in all aspects of lung development, repair, and disease progression. They provide an overview of recent research findings and highlight where research is needed to further elucidate mechanisms of action, with the aim of improving disease treatments.
Collapse
Affiliation(s)
- Cody J Aros
- UCLA Department of Molecular Biology Interdepartmental Program, UCLA, Los Angeles, CA, USA.,UCLA Medical Scientist Training Program, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA.,UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Carla J Pantoja
- UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Brigitte N Gomperts
- UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA. .,Division of Pulmonary and Critical Care MedicineDavid Geffen School of Medicine, UCLA, Los Angeles, CA, USA. .,Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA, USA. .,Eli and Edythe Broad Stem Cell Research Center, UCLA, Los Angeles, CA, USA.
| |
Collapse
|
4
|
Raslan AA, Yoon JK. WNT Signaling in Lung Repair and Regeneration. Mol Cells 2020; 43:774-783. [PMID: 32807748 PMCID: PMC7528681 DOI: 10.14348/molcells.2020.0059] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 07/06/2020] [Accepted: 07/23/2020] [Indexed: 01/05/2023] Open
Abstract
The lung has a vital function in gas exchange between the blood and the external atmosphere. It also has a critical role in the immune defense against external pathogens and environmental factors. While the lung is classified as a relatively quiescent organ with little homeostatic turnover, it shows robust regenerative capacity in response to injury, mediated by the resident stem/progenitor cells. During regeneration, regionally distinct epithelial cell populations with specific functions are generated from several different types of stem/progenitor cells localized within four histologically distinguished regions: trachea, bronchi, bronchioles, and alveoli. WNT signaling is one of the key signaling pathways involved in regulating many types of stem/progenitor cells in various organs. In addition to its developmental role in the embryonic and fetal lung, WNT signaling is critical for lung homeostasis and regeneration. In this minireview, we summarize and discuss recent advances in the understanding of the role of WNT signaling in lung regeneration with an emphasis on stem/progenitor cells.
Collapse
Affiliation(s)
- Ahmed A. Raslan
- Soonchunhyang Institute of Medi-bio Science, Soonchunhyang University, Cheonan 35, Korea
- Department of Integrated Biomedical Science, Soonchunhyang University, Cheonan 31151, Korea
| | - Jeong Kyo Yoon
- Soonchunhyang Institute of Medi-bio Science, Soonchunhyang University, Cheonan 35, Korea
- Department of Integrated Biomedical Science, Soonchunhyang University, Cheonan 31151, Korea
| |
Collapse
|
5
|
Aros CJ, Paul MK, Pantoja CJ, Bisht B, Meneses LK, Vijayaraj P, Sandlin JM, France B, Tse JA, Chen MW, Shia DW, Rickabaugh TM, Damoiseaux R, Gomperts BN. High-Throughput Drug Screening Identifies a Potent Wnt Inhibitor that Promotes Airway Basal Stem Cell Homeostasis. Cell Rep 2020; 30:2055-2064.e5. [PMID: 32075752 PMCID: PMC7050206 DOI: 10.1016/j.celrep.2020.01.059] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 12/14/2019] [Accepted: 01/17/2020] [Indexed: 12/18/2022] Open
Abstract
Mechanisms underpinning airway epithelial homeostatic maintenance and ways to prevent its dysregulation remain elusive. Herein, we identify that β-catenin phosphorylated at Y489 (p-β-cateninY489) emerges during human squamous lung cancer progression. This led us to develop a model of airway basal stem cell (ABSC) hyperproliferation by driving Wnt/β-catenin signaling, resulting in a morphology that resembles premalignant lesions and loss of ciliated cell differentiation. To identify small molecules that could reverse this process, we performed a high-throughput drug screen for inhibitors of Wnt/β-catenin signaling. Our studies unveil Wnt inhibitor compound 1 (WIC1), which suppresses T-cell factor/lymphoid enhancer-binding factor (TCF/LEF) activity, reduces ABSC proliferation, induces ciliated cell differentiation, and decreases nuclear p-β-cateninY489. Collectively, our work elucidates a dysregulated Wnt/p-β-cateninY489 axis in lung premalignancy that can be modeled in vitro and identifies a Wnt/β-catenin inhibitor that promotes airway homeostasis. WIC1 may therefore serve as a tool compound in regenerative medicine studies with implications for restoring normal airway homeostasis after injury.
Collapse
Affiliation(s)
- Cody J Aros
- UCLA Department of Molecular Biology Interdepartmental Program, UCLA, Los Angeles, CA 90095, USA; UCLA Medical Scientist Training Program, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA; UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - Manash K Paul
- Division of Pulmonary and Critical Care Medicine, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - Carla J Pantoja
- UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - Bharti Bisht
- Division of Pulmonary and Critical Care Medicine, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - Luisa K Meneses
- UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - Preethi Vijayaraj
- UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA; Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA 90095, USA
| | - Jenna M Sandlin
- UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - Bryan France
- California NanoSystems Institute, UCLA, Los Angeles, CA 90095, USA
| | - Jonathan A Tse
- UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - Michelle W Chen
- UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - David W Shia
- UCLA Department of Molecular Biology Interdepartmental Program, UCLA, Los Angeles, CA 90095, USA; UCLA Medical Scientist Training Program, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA; UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - Tammy M Rickabaugh
- UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA
| | - Robert Damoiseaux
- Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA 90095, USA; UCLA Department of Molecular & Medical Pharmacology, UCLA, Los Angeles, CA 90095, USA; California NanoSystems Institute, UCLA, Los Angeles, CA 90095, USA
| | - Brigitte N Gomperts
- UCLA Medical Scientist Training Program, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA; UCLA Children's Discovery and Innovation Institute, Mattel Children's Hospital UCLA, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA; Division of Pulmonary and Critical Care Medicine, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095, USA; Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA 90095, USA; Eli and Edythe Broad Stem Cell Research Center, UCLA, Los Angeles, CA 90095, USA.
| |
Collapse
|
6
|
Ruiz García S, Deprez M, Lebrigand K, Cavard A, Paquet A, Arguel MJ, Magnone V, Truchi M, Caballero I, Leroy S, Marquette CH, Marcet B, Barbry P, Zaragosi LE. Novel dynamics of human mucociliary differentiation revealed by single-cell RNA sequencing of nasal epithelial cultures. Development 2019; 146:dev.177428. [PMID: 31558434 PMCID: PMC6826037 DOI: 10.1242/dev.177428] [Citation(s) in RCA: 152] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 09/18/2019] [Indexed: 12/12/2022]
Abstract
The upper airway epithelium, which is mainly composed of multiciliated, goblet, club and basal cells, ensures proper mucociliary function and can regenerate in response to assaults. In chronic airway diseases, defective repair leads to tissue remodeling. Delineating key drivers of differentiation dynamics can help understand how normal or pathological regeneration occurs. Using single-cell transcriptomics and lineage inference, we have unraveled trajectories from basal to luminal cells, providing novel markers for specific populations. We report that: (1) a precursor subgroup of multiciliated cells, which we have entitled deuterosomal cells, is defined by specific markers, such as DEUP1, FOXN4, YPEL1, HES6 and CDC20B; (2) goblet cells can be precursors of multiciliated cells, thus explaining the presence of hybrid cells that co-express markers of goblet and multiciliated cells; and (3) a repertoire of molecules involved in the regeneration process, such as keratins or components of the Notch, Wnt or BMP/TGFβ pathways, can be identified. Confirmation of our results on fresh human and pig airway samples, and on mouse tracheal cells, extend and confirm our conclusions regarding the molecular and cellular choreography at work during mucociliary epithelial differentiation.
Collapse
Affiliation(s)
| | - Marie Deprez
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis 06560, France
| | - Kevin Lebrigand
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis 06560, France
| | - Amélie Cavard
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis 06560, France
| | - Agnès Paquet
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis 06560, France
| | | | - Virginie Magnone
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis 06560, France
| | - Marin Truchi
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis 06560, France
| | | | - Sylvie Leroy
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis 06560, France.,Université Côte d'Azur, CHU de Nice, Pulmonology Department, Nice 06000, France
| | | | - Brice Marcet
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis 06560, France
| | - Pascal Barbry
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis 06560, France
| | | |
Collapse
|
7
|
Shrestha A, Carraro G, Nottet N, Vazquez-Armendariz AI, Herold S, Cordero J, Singh I, Wilhelm J, Barreto G, Morty R, El Agha E, Mari B, Chen C, Zhang JS, Chao CM, Bellusci S. A critical role for miR-142 in alveolar epithelial lineage formation in mouse lung development. Cell Mol Life Sci 2019; 76:2817-2832. [PMID: 30887098 PMCID: PMC11105218 DOI: 10.1007/s00018-019-03067-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 03/05/2019] [Accepted: 03/12/2019] [Indexed: 01/14/2023]
Abstract
The respiratory epithelium arises from alveolar epithelial progenitors which differentiate into alveolar epithelial type 1 (AT1) and type 2 (AT2) cells. AT2 cells are stem cells in the lung critical for the repair process after injury. Mechanisms regulating AT1 and AT2 cell maturation are poorly defined. We report that the activation of the glucocorticoid pathway in an in vitro alveolar epithelial lineage differentiation assay led to increased AT2 marker Sftpc and decreased miR-142 expression. Using miR-142 KO mice, we demonstrate an increase in the AT2/AT1 cell number ratio. Overexpression of miR-142 in alveolar progenitor cells in vivo led to the opposite effect. Examination of the KO lungs at E18.5 revealed enhanced expression of miR-142 targets Apc, Ep300 and Kras associated with increased β-catenin and p-Erk signaling. Silencing of miR-142 expression in lung explants grown in vitro triggers enhanced Sftpc expression as well as increased AT2/AT1 cell number ratio. Pharmacological inhibition of Ep300-β-catenin but not Erk in vitro prevented the increase in Sftpc expression triggered by loss of miR-142. These results suggest that the glucocorticoid-miR-142-Ep300-β-catenin signaling axis controls pneumocyte maturation.
Collapse
Affiliation(s)
- Amit Shrestha
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
- Cardio-Pulmonary Institute (CPI), Member of the German Center for Lung Research (DZL), Universities of Giessen and Marburg Lung Center (UGMLC), Justus-Liebig-University Giessen, 35392, Giessen, Germany
| | - Gianni Carraro
- Department of Medicine, Cedars-Sinai Medical Center, Lung and Regenerative Medicine Institutes, Los Angeles, CA, USA
| | - Nicolas Nottet
- Centre National de la Recherche Scientifique, CNRS, UMR 7275, Institut de Pharmacologie Moleculaire et Cellulaire (IPMC), Sophia Antipolis, France
- Universite Cote d'Azur, Nice, France
| | - Ana Ivonne Vazquez-Armendariz
- Cardio-Pulmonary Institute (CPI), Member of the German Center for Lung Research (DZL), Universities of Giessen and Marburg Lung Center (UGMLC), Justus-Liebig-University Giessen, 35392, Giessen, Germany
| | - Susanne Herold
- Cardio-Pulmonary Institute (CPI), Member of the German Center for Lung Research (DZL), Universities of Giessen and Marburg Lung Center (UGMLC), Justus-Liebig-University Giessen, 35392, Giessen, Germany
| | - Julio Cordero
- Lung Cancer Epigenetics, Member of the German Center of Lung Research (Deutsches Zentrum für Lungenforschung, DZL), Max-Planck-Institute for Heart and Lung Research, 61231, Bad Nauheim, Germany
| | - Indrabahadur Singh
- Lung Cancer Epigenetics, Member of the German Center of Lung Research (Deutsches Zentrum für Lungenforschung, DZL), Max-Planck-Institute for Heart and Lung Research, 61231, Bad Nauheim, Germany
| | - Jochen Wilhelm
- Cardio-Pulmonary Institute (CPI), Member of the German Center for Lung Research (DZL), Universities of Giessen and Marburg Lung Center (UGMLC), Justus-Liebig-University Giessen, 35392, Giessen, Germany
| | - Guillermo Barreto
- Lung Cancer Epigenetics, Member of the German Center of Lung Research (Deutsches Zentrum für Lungenforschung, DZL), Max-Planck-Institute for Heart and Lung Research, 61231, Bad Nauheim, Germany
- Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, 420008, Kazan, Russian Federation
| | - Rory Morty
- Department of Lung Development and Remodeling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Elie El Agha
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
- Cardio-Pulmonary Institute (CPI), Member of the German Center for Lung Research (DZL), Universities of Giessen and Marburg Lung Center (UGMLC), Justus-Liebig-University Giessen, 35392, Giessen, Germany
| | - Bernard Mari
- Centre National de la Recherche Scientifique, CNRS, UMR 7275, Institut de Pharmacologie Moleculaire et Cellulaire (IPMC), Sophia Antipolis, France
- Universite Cote d'Azur, Nice, France
| | - Chengshui Chen
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jin-San Zhang
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
- Institute of Life Sciences, Wenzhou University, Wenzhou, Zhejiang, People's Republic of China
| | - Cho-Ming Chao
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China.
- Cardio-Pulmonary Institute (CPI), Member of the German Center for Lung Research (DZL), Universities of Giessen and Marburg Lung Center (UGMLC), Justus-Liebig-University Giessen, 35392, Giessen, Germany.
- Department of General Pediatrics and Neonatology, University Children's Hospital Gießen, Justus-Liebig-University, Giessen, Germany.
| | - Saverio Bellusci
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China.
- Cardio-Pulmonary Institute (CPI), Member of the German Center for Lung Research (DZL), Universities of Giessen and Marburg Lung Center (UGMLC), Justus-Liebig-University Giessen, 35392, Giessen, Germany.
| |
Collapse
|
8
|
Qu J, Yue L, Gao J, Yao H. Perspectives on Wnt Signal Pathway in the Pathogenesis and Therapeutics of Chronic Obstructive Pulmonary Disease. J Pharmacol Exp Ther 2019; 369:473-480. [PMID: 30952680 DOI: 10.1124/jpet.118.256222] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Accepted: 04/04/2019] [Indexed: 12/16/2022] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a chronic lung disease with progressive airflow limitation and functional decline. The pathogenic mechanisms for this disease include oxidative stress, inflammatory responses, disturbed protease/antiprotease equilibrium, apoptosis/proliferation imbalance, senescence, autophagy, metabolic reprogramming, and mitochondrial dysfunction. The Wnt signaling pathway is an evolutionarily conserved signaling pathway that is abnormal in COPD, including chronic bronchitis and pulmonary emphysema. Furthermore, Wnt signaling has been shown to modulate aforementioned cellular processes involved in COPD. From this perspective, we provide an updated understanding of the crosstalk between Wnt signal and these cellular processes, and highlight the crucial role of the Wnt signal during the development of COPD. We also discuss the potential for targeting the Wnt signal in future translational and pharmacological therapeutics aimed at prevention and treatment of this disease.
Collapse
Affiliation(s)
- Jiao Qu
- The Second Affiliated Hospital, School of Pharmacy, Dalian Medical University, Dalian, Liaoning, China (J. Q., J. G.); The First Affiliated Hospital, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China (J.Q., J.G.); Department of Orthopedics, Warren Alpert Medical School, Brown University/Rhode Island Hospital, Providence, Rhode Island (L.Y.); and Department of Molecular Biology, Cell Biology and Biochemistry, Brown University Division of Biology and Medicine, Providence, Rhode Island (H.Y.)
| | - Li Yue
- The Second Affiliated Hospital, School of Pharmacy, Dalian Medical University, Dalian, Liaoning, China (J. Q., J. G.); The First Affiliated Hospital, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China (J.Q., J.G.); Department of Orthopedics, Warren Alpert Medical School, Brown University/Rhode Island Hospital, Providence, Rhode Island (L.Y.); and Department of Molecular Biology, Cell Biology and Biochemistry, Brown University Division of Biology and Medicine, Providence, Rhode Island (H.Y.)
| | - Jian Gao
- The Second Affiliated Hospital, School of Pharmacy, Dalian Medical University, Dalian, Liaoning, China (J. Q., J. G.); The First Affiliated Hospital, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China (J.Q., J.G.); Department of Orthopedics, Warren Alpert Medical School, Brown University/Rhode Island Hospital, Providence, Rhode Island (L.Y.); and Department of Molecular Biology, Cell Biology and Biochemistry, Brown University Division of Biology and Medicine, Providence, Rhode Island (H.Y.)
| | - Hongwei Yao
- The Second Affiliated Hospital, School of Pharmacy, Dalian Medical University, Dalian, Liaoning, China (J. Q., J. G.); The First Affiliated Hospital, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China (J.Q., J.G.); Department of Orthopedics, Warren Alpert Medical School, Brown University/Rhode Island Hospital, Providence, Rhode Island (L.Y.); and Department of Molecular Biology, Cell Biology and Biochemistry, Brown University Division of Biology and Medicine, Providence, Rhode Island (H.Y.)
| |
Collapse
|
9
|
Malleske DT, Hayes D, Lallier SW, Hill CL, Reynolds SD. Regulation of Human Airway Epithelial Tissue Stem Cell Differentiation by β-Catenin, P300, and CBP. Stem Cells 2018; 36:1905-1916. [PMID: 30171668 DOI: 10.1002/stem.2906] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 08/10/2018] [Accepted: 08/18/2018] [Indexed: 12/22/2022]
Abstract
The wingless/integrase-1 (WNT)/β-catenin signaling pathway is active in several chronic lung diseases including idiopathic pulmonary fibrosis, asthma, and chronic obstructive pulmonary disease. Although this WNT/β-catenin pathway activity is associated with an increase in mucus cell frequency and a decrease in ciliated cell frequency, a cause and consequence relationship between signaling and cell frequency has not been established. We previously demonstrated that genetic stabilization of β-catenin inhibited differentiation of mouse bronchiolar tissue stem cells (TSC). This study determined the effect of β-catenin and its co-factors P300 (E1A-binding protein, 300 kDa) and cAMP response element binding (CREB)-binding protein (CBP) on human bronchial epithelial TSC differentiation to mucus and ciliated cells. We developed a modified air-liquid interface (ALI) culture system in which mucus and ciliated cell frequency is similar. These cultures were treated with the β-catenin agonist CHIR99021 (CHIR) and antagonists to β-catenin (XAV939), P300 (IQ1), and CBP (ICG001). We report that human TSC differentiation to mucus and ciliated cells can be divided into two stages, specification and commitment. CHIR treatment inhibited mucus and ciliated cell commitment while XAV939 treatment demonstrated that β-catenin was necessary for mucus and ciliated cell specification. Additional studies demonstrate that a β-catenin/P300 complex promotes mucus cell specification and that β-catenin interacts with either P300 or CBP to inhibit ciliated cell commitment. These data indicate that activation of β-catenin-dependent signaling in chronic lung disease leads to changes in mucus and ciliated cell frequency and that P300 and CBP tune the β-catenin signal to favor mucus cell differentiation. Stem Cells 2018;36:1905-12.
Collapse
Affiliation(s)
- Daniel T Malleske
- Department of Pediatrics, The Ohio State University, Columbus, Ohio, USA
| | - Don Hayes
- Department of Pediatrics, The Ohio State University, Columbus, Ohio, USA.,Department of Internal Medicine, The Ohio State University, Columbus, Ohio, USA.,Department of Surgery, The Ohio State University, Columbus, Ohio, USA
| | - Scott W Lallier
- Centers for Perinatal Research, Nationwide Children's Hospital, Columbus, Ohio, USA
| | - Cynthia L Hill
- Centers for Perinatal Research, Nationwide Children's Hospital, Columbus, Ohio, USA
| | - Susan D Reynolds
- Department of Pediatrics, The Ohio State University, Columbus, Ohio, USA.,Centers for Perinatal Research, Nationwide Children's Hospital, Columbus, Ohio, USA
| |
Collapse
|
10
|
Morrisey EE, Rustgi AK. The Lung and Esophagus: Developmental and Regenerative Overlap. Trends Cell Biol 2018; 28:738-748. [PMID: 29871822 DOI: 10.1016/j.tcb.2018.04.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 04/11/2018] [Accepted: 04/23/2018] [Indexed: 11/28/2022]
Abstract
Lung and esophageal development and organogenesis involve a complex interplay of signaling pathways and transcriptional factors. Once the lung and esophagus do separate, their epithelial proliferation and differentiation programs share certain common properties that may fuel adaptive responses to injury and subsequent regeneration. Lung and esophageal tissue organogenesis and regeneration provide perspectives on squamous cell cancers and adenocarcinomas in each tissue.
Collapse
Affiliation(s)
- Edward E Morrisey
- Division of Cardiovascular Medicine, Center for Pulmonary Biology, Cardiovascular Institute, Institute for Regenerative Medicine, Abramson Cancer Center, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA 19104, USA.
| | - Anil K Rustgi
- Division of Gastroenterology, Departments of Medicine and Genetics, Institute for Regenerative Medicine, Abramson Cancer Center, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA 19104, USA.
| |
Collapse
|
11
|
Zhu Y, Chen X, Yang X, El-Hashash A. Stem cells in lung repair and regeneration: Current applications and future promise. J Cell Physiol 2018; 233:6414-6424. [PMID: 29271480 DOI: 10.1002/jcp.26414] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 12/19/2017] [Indexed: 12/18/2022]
Abstract
Lung diseases are major cause of morbidity and mortality worldwide. The progress in regenerative medicine and stem cell research in the lung are currently a fast-growing research topic that can provide solutions to these major health problems. Under normal conditions, the rate of cellular proliferation is relatively low in the lung in vivo, compared to other major organ systems. Lung injury leads to the activation of stem/progenitor cell populations that re-enter the cell cycle. Yet, little is known about stem cells in the lung, despite common thoughts that these cells could play a critical role in the repair of lung injuries. Nor do we fully understand the cellular and architectural complexity of the respiratory tract, and the diverse stem/progenitor cells that are involved in the lung repair and regeneration. In this review, we discuss the conceptual framework of lung stem/progenitor cell biology, and describe lung diseases, in which stem cell manipulations may be physiologically significant. In addition, we highlight the challenges of lung stem cell-based therapy.
Collapse
Affiliation(s)
- Yuqing Zhu
- Centre of Stem cell and Regenerative Medicine, Schools of Medicine and Basic Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Xiao Chen
- Centre of Stem cell and Regenerative Medicine, Schools of Medicine and Basic Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Xu Yang
- Section of Environmental Biomedicine, School of Life Science, Central China Normal University, Wuhan, Hubei, China
| | - Ahmed El-Hashash
- Centre of Stem cell and Regenerative Medicine, Schools of Medicine and Basic Medicine, Zhejiang University, Hangzhou, Zhejiang, China.,University of Edinburgh-Zhejiang University Institute (UoE-ZJU Institute), Haining, Zhejiang, China.,Edinburgh Medical School, University of Edinburgh, Edinburgh, UK
| |
Collapse
|
12
|
Efficient Derivation of Functional Human Airway Epithelium from Pluripotent Stem Cells via Temporal Regulation of Wnt Signaling. Cell Stem Cell 2017; 20:844-857.e6. [PMID: 28366587 DOI: 10.1016/j.stem.2017.03.001] [Citation(s) in RCA: 264] [Impact Index Per Article: 37.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 01/16/2017] [Accepted: 03/03/2017] [Indexed: 11/20/2022]
Abstract
Effective derivation of functional airway organoids from induced pluripotent stem cells (iPSCs) would provide valuable models of lung disease and facilitate precision therapies for airway disorders such as cystic fibrosis. However, limited understanding of human airway patterning has made this goal challenging. Here, we show that cyclical modulation of the canonical Wnt signaling pathway enables rapid directed differentiation of human iPSCs via an NKX2-1+ progenitor intermediate into functional proximal airway organoids. We find that human NKX2-1+ progenitors have high levels of Wnt activation but respond intrinsically to decreases in Wnt signaling by rapidly patterning into proximal airway lineages at the expense of distal fates. Using this directed approach, we were able to generate cystic fibrosis patient-specific iPSC-derived airway organoids with a defect in forskolin-induced swelling that is rescued by gene editing to correct the disease mutation. Our approach has many potential applications in modeling and drug screening for airway diseases.
Collapse
|
13
|
Chen F, Fine A. Stem Cells in Lung Injury and Repair. THE AMERICAN JOURNAL OF PATHOLOGY 2016; 186:2544-50. [PMID: 27524796 DOI: 10.1016/j.ajpath.2016.05.023] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 03/31/2016] [Accepted: 05/03/2016] [Indexed: 11/27/2022]
Abstract
In this review, we summarize the recent literature on the biology of endogenous stem cells in adult lung injury repair. We focus on in vivo studies in mice with an emphasis on data generated using cell-specific Cre-dependent lineage-tracing systems. These studies provide new information on the identification of lung stem cells, their hierarchical relationships, the plasticity of their behavior in different types of injury, and the molecular signals that control their fates. Although most of this work has been on epithelial hierarchies, we expect that further development of robust genetic tools will foster meaningful investigations into how nonepithelial cell populations are controlled during lung injury repair in adults. The ultimate challenge will be to translate these findings to the pathogenesis and treatment of human lung diseases.
Collapse
Affiliation(s)
- Felicia Chen
- The Pulmonary Center, Boston University School of Medicine, Boston, Massachusetts.
| | - Alan Fine
- The Pulmonary Center, Boston University School of Medicine, Boston, Massachusetts; Division of Pulmonary, Critical Care, and Allergy, West Roxbury Veteran's Hospital, West Roxbury, Massachusetts
| |
Collapse
|
14
|
Bastakoty D, Young PP. Wnt/β-catenin pathway in tissue injury: roles in pathology and therapeutic opportunities for regeneration. FASEB J 2016; 30:3271-3284. [PMID: 27335371 DOI: 10.1096/fj.201600502r] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 06/14/2016] [Indexed: 12/19/2022]
Abstract
The Wnt/β-catenin pathway is an evolutionarily conserved set of signals with critical roles in embryonic and neonatal development across species. In mammals the pathway is quiescent in many organs. It is reactivated in response to injury and is reported to play complex and contrasting roles in promoting regeneration and fibrosis. We review the current understanding of the role of the Wnt/β-catenin pathway in injury of various mammalian organs and discuss the current advances and potential of Wnt inhibitory therapeutics toward promoting tissue regeneration and reducing fibrosis.-Bastakoty, D., Young, P. P. Wnt/β-catenin pathway in tissue injury: roles in pathology and therapeutic opportunities for regeneration.
Collapse
Affiliation(s)
- Dikshya Bastakoty
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA; and
| | - Pampee P Young
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA; and Department of Internal Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| |
Collapse
|
15
|
Lung Regeneration: Endogenous and Exogenous Stem Cell Mediated Therapeutic Approaches. Int J Mol Sci 2016; 17:ijms17010128. [PMID: 26797607 PMCID: PMC4730369 DOI: 10.3390/ijms17010128] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 01/07/2016] [Accepted: 01/11/2016] [Indexed: 12/25/2022] Open
Abstract
The tissue turnover of unperturbed adult lung is remarkably slow. However, after injury or insult, a specialised group of facultative lung progenitors become activated to replenish damaged tissue through a reparative process called regeneration. Disruption in this process results in healing by fibrosis causing aberrant lung remodelling and organ dysfunction. Post-insult failure of regeneration leads to various incurable lung diseases including chronic obstructive pulmonary disease (COPD) and idiopathic pulmonary fibrosis. Therefore, identification of true endogenous lung progenitors/stem cells, and their regenerative pathway are crucial for next-generation therapeutic development. Recent studies provide exciting and novel insights into postnatal lung development and post-injury lung regeneration by native lung progenitors. Furthermore, exogenous application of bone marrow stem cells, embryonic stem cells and inducible pluripotent stem cells (iPSC) show evidences of their regenerative capacity in the repair of injured and diseased lungs. With the advent of modern tissue engineering techniques, whole lung regeneration in the lab using de-cellularised tissue scaffold and stem cells is now becoming reality. In this review, we will highlight the advancement of our understanding in lung regeneration and development of stem cell mediated therapeutic strategies in combating incurable lung diseases.
Collapse
|
16
|
Peng T, Frank DB, Kadzik RS, Morley MP, Rathi KS, Wang T, Zhou S, Cheng L, Lu MM, Morrisey EE. Hedgehog actively maintains adult lung quiescence and regulates repair and regeneration. Nature 2015; 526:578-82. [PMID: 26436454 PMCID: PMC4713039 DOI: 10.1038/nature14984] [Citation(s) in RCA: 153] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 07/28/2015] [Indexed: 12/23/2022]
Abstract
Postnatal tissue quiescence is thought to be a default state in the absence of a proliferative stimulus such as injury. Previous studies have demonstrated that certain embryonic development programs are reactivated aberrantly in adult organs to drive repair and regeneration1–3, it is not well understood how quiescence is maintained in organs such as the lung which displays a remarkably low level of cellular turnover4,5. We now demonstrate that quiescence in the adult lung is an actively maintained state and is regulated by hedgehog signaling. Epithelial-specific deletion of sonic hedgehog during postnatal homeostasis in the lung results in a proliferative expansion of the adjacent lung mesenchyme. Hedgehog signaling is initially down-regulated during the acute phase of epithelial injury as the mesenchyme proliferates in response, but returns to baseline during injury resolution as quiescence is restored. Activation of hedgehog during acute epithelial injury attenuates the proliferative expansion of the lung mesenchyme, whereas inactivation of hedgehog signaling prevents the restoration of quiescence during injury resolution. Finally, we show that hedgehog also regulates epithelial quiescence and regeneration in response to injury via a mesenchymal feedback mechanism. These results demonstrate that epithelial-mesenchymal interactions coordinated by hedgehog actively maintains postnatal tissue homeostasis, and deregulation of hedgehog during injury leads to aberrant repair and regeneration in the lung.
Collapse
Affiliation(s)
- Tien Peng
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - David B Frank
- Department of Pediatrics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Rachel S Kadzik
- Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Michael P Morley
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Komal S Rathi
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Tao Wang
- Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Su Zhou
- Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Lan Cheng
- Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Min Min Lu
- Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Edward E Morrisey
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| |
Collapse
|
17
|
Zhu Y, Wang W, Wang X. Roles of transcriptional factor 7 in production of inflammatory factors for lung diseases. J Transl Med 2015; 13:273. [PMID: 26289446 PMCID: PMC4543455 DOI: 10.1186/s12967-015-0617-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 07/27/2015] [Indexed: 12/25/2022] Open
Abstract
Lung disease is the major cause of death and hospitalization worldwide. Transcription factors such as transcription factor 7 (TCF7) are involved in the pathogenesis of lung diseases. TCF7 is important for T cell development and differentiation, embryonic development, or tumorogenesis. Multiple TCF7 isoforms can be characterized by the full-length isoform (FL-TCF7) as a transcription activator, or dominant negative isoform (dn-TCF7) as a transcription repressor. TCF7 interacts with multiple proteins or target genes and participates in several signal pathways critical for lung diseases. TCF7 is involved in pulmonary infection, allergy or asthma through promoting T cells differentiating to Th2 or memory T cells. TCF7 also works in tissue repair and remodeling after acute lung injury. The dual roles of TCF7 in lung cancers were discussed and it is associated with the cellular proliferation, invasion or metastasis. Thus, TCF7 plays critical roles in lung diseases and should be considered as a new therapeutic target.
Collapse
Affiliation(s)
- Yichun Zhu
- Shanghai Respiratory Research Institute, Zhongshan Hospital, Fudan University Center for Clinical Bioinformatics, Fenglin Rd 180, Shanghai, 200032, China.
| | - William Wang
- Shanghai Respiratory Research Institute, Zhongshan Hospital, Fudan University Center for Clinical Bioinformatics, Fenglin Rd 180, Shanghai, 200032, China.
| | - Xiangdong Wang
- Shanghai Respiratory Research Institute, Zhongshan Hospital, Fudan University Center for Clinical Bioinformatics, Fenglin Rd 180, Shanghai, 200032, China.
| |
Collapse
|
18
|
Shiomi T, Sklepkiewicz P, Bodine PVN, D'Armiento JM. Maintenance of the bronchial alveolar stem cells in an undifferentiated state by secreted frizzled-related protein 1. FASEB J 2014; 28:5242-9. [PMID: 25212222 DOI: 10.1096/fj.13-242735] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Bronchoalveolar stem cells (BASCs) are mobilized during injury and identified as lung progenitor cells, but the molecular regulation of this population of cells has not been elucidated. Secreted frizzled-related protein 1 (SFRP1) is a critical molecule involved in alveolar duct formation in the lung and here we demonstrate its importance in controlling cell differentiation during lung injury. Mice lacking SFRP1 exhibited a rapid repair response leading to aberrant proliferation of differentiated cells. Furthermore, SFRP1 treatment of BASCs maintained these cells in a quiescent state. In vivo overexpression of SFRP1 after injury suppressed differentiation and resulted in the accumulation of BASCs correlating with in vitro studies. These findings suggest that SFRP1 expression in the adult maintains progenitor cells within their undifferentiated state and suggests that manipulation of this pathway is a potential target to augment the lung repair process during disease.
Collapse
Affiliation(s)
- Takayuki Shiomi
- Department of Anesthesiology, College of Physicians and Surgeons, Columbia University, New York, New York, USA; and
| | - Piotr Sklepkiewicz
- Department of Anesthesiology, College of Physicians and Surgeons, Columbia University, New York, New York, USA; and
| | | | - Jeanine M D'Armiento
- Department of Anesthesiology, College of Physicians and Surgeons, Columbia University, New York, New York, USA; and
| |
Collapse
|
19
|
Rezaee F, Georas SN. Breaking barriers. New insights into airway epithelial barrier function in health and disease. Am J Respir Cell Mol Biol 2014; 50:857-69. [PMID: 24467704 DOI: 10.1165/rcmb.2013-0541rt] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Epithelial permeability is a hallmark of mucosal inflammation, but the molecular mechanisms involved remain poorly understood. A key component of the epithelial barrier is the apical junctional complex that forms between neighboring cells. Apical junctional complexes are made of tight junctions and adherens junctions and link to the cellular cytoskeleton via numerous adaptor proteins. Although the existence of tight and adherens junctions between epithelial cells has long been recognized, in recent years there have been significant advances in our understanding of the molecular regulation of junctional complex assembly and disassembly. Here we review the current thinking about the structure and function of the apical junctional complex in airway epithelial cells, emphasizing the translational aspects of relevance to cystic fibrosis and asthma. Most work to date has been conducted using cell culture models, but technical advancements in imaging techniques suggest that we are on the verge of important new breakthroughs in this area in physiological models of airway diseases.
Collapse
Affiliation(s)
- Fariba Rezaee
- 1 Division of Pediatric Pulmonary Medicine, Department of Pediatrics, and
| | | |
Collapse
|
20
|
Hogan BLM, Barkauskas CE, Chapman HA, Epstein JA, Jain R, Hsia CCW, Niklason L, Calle E, Le A, Randell SH, Rock J, Snitow M, Krummel M, Stripp BR, Vu T, White ES, Whitsett JA, Morrisey EE. Repair and regeneration of the respiratory system: complexity, plasticity, and mechanisms of lung stem cell function. Cell Stem Cell 2014; 15:123-38. [PMID: 25105578 PMCID: PMC4212493 DOI: 10.1016/j.stem.2014.07.012] [Citation(s) in RCA: 608] [Impact Index Per Article: 60.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Respiratory disease is the third leading cause of death in the industrialized world. Consequently, the trachea, lungs, and cardiopulmonary vasculature have been the focus of extensive investigations. Recent studies have provided new information about the mechanisms driving lung development and differentiation. However, there is still much to learn about the ability of the adult respiratory system to undergo repair and to replace cells lost in response to injury and disease. This Review highlights the multiple stem/progenitor populations in different regions of the adult lung, the plasticity of their behavior in injury models, and molecular pathways that support homeostasis and repair.
Collapse
Affiliation(s)
- Brigid L M Hogan
- Department of Cell Biology, Duke Medicine, Durham, NC 27705, USA.
| | - Christina E Barkauskas
- Division of Pulmonary, Allergy and Critical Care Medicine, Duke Medicine, Durham, NC 27705, USA
| | - Harold A Chapman
- Division of Pulmonary and Critical Care, Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Jonathan A Epstein
- Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Rajan Jain
- Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Connie C W Hsia
- Department of Internal Medicine, University of Texas, Southwestern Medical Center, Dallas, TX 75390, USA
| | - Laura Niklason
- Departments of Anesthesiology and Biomedical Engineering, Yale University, New Haven, CT 06520, USA
| | - Elizabeth Calle
- Department of Cell Biology, Duke Medicine, Durham, NC 27705, USA
| | - Andrew Le
- Department of Cell Biology, Duke Medicine, Durham, NC 27705, USA
| | - Scott H Randell
- Department of Cell Biology and Physiology, The University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA
| | - Jason Rock
- Department of Anatomy, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Melinda Snitow
- Perleman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Matthew Krummel
- Division of Pulmonary and Critical Care, Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Barry R Stripp
- Regenerative Medicine Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Thiennu Vu
- Division of Pulmonary and Critical Care, Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Eric S White
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jeffrey A Whitsett
- Section of Neonatology, Perinatal and Pulmonary Biology, Department of Pediatrics, Cincinnati Children's Hospital Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229, USA
| | - Edward E Morrisey
- Departments of Medicine and Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA.
| |
Collapse
|
21
|
Kotton DN, Morrisey EE. Lung regeneration: mechanisms, applications and emerging stem cell populations. Nat Med 2014; 20:822-32. [PMID: 25100528 PMCID: PMC4229034 DOI: 10.1038/nm.3642] [Citation(s) in RCA: 345] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Accepted: 06/24/2014] [Indexed: 12/15/2022]
Abstract
Recent studies have shown that the respiratory system has an extensive ability to respond to injury and regenerate lost or damaged cells. The unperturbed adult lung is remarkably quiescent, but after insult or injury progenitor populations can be activated or remaining cells can re-enter the cell cycle. Techniques including cell-lineage tracing and transcriptome analysis have provided novel and exciting insights into how the lungs and trachea regenerate in response to injury and have allowed the identification of pathways important in lung development and regeneration. These studies are now informing approaches for modulating the pathways that may promote endogenous regeneration as well as the generation of exogenous lung cell lineages from pluripotent stem cells. The emerging advances, highlighted in this Review, are providing new techniques and assays for basic mechanistic studies as well as generating new model systems for human disease and strategies for cell replacement.
Collapse
Affiliation(s)
- Darrell N Kotton
- 1] Center for Regenerative Medicine, Boston University and Boston Medical Center, Boston, Massachusetts, USA. [2] Pulmonary Center, Boston University, Boston, Massachusetts, USA. [3] Department of Medicine, Boston University, Boston, Massachusetts, USA
| | - Edward E Morrisey
- 1] Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA. [2] Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, Pennsylvania, USA. [3] Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania, USA. [4] Institute for Regenerative Medicine, University of Pennsylvania Philadelphia, Pennsylvania, USA
| |
Collapse
|
22
|
Warner SMB, Hackett TL, Shaheen F, Hallstrand TS, Kicic A, Stick SM, Knight DA. Transcription factor p63 regulates key genes and wound repair in human airway epithelial basal cells. Am J Respir Cell Mol Biol 2014; 49:978-88. [PMID: 23837456 DOI: 10.1165/rcmb.2012-0447oc] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The airway epithelium in asthma displays altered repair and incomplete barrier formation. Basal cells are the progenitor cells of the airway epithelium, and can repopulate other cell types after injury. We previously reported increased numbers of basal cells expressing the transcription factor p63 in the airway epithelium of patients with asthma. Here we sought to determine the molecular consequences of p63 expression in basal human airway epithelial cells during wound repair. Because at least six isoforms of p63 exist (N-terminally truncated [ΔN] versus transcriptional activation promoter variants and α, β, or γ 3' splice variants), the expression of all isoforms was investigated in primary human airway epithelial cells (pHAECs). We modulated p63 expression, using small interfering RNA (siRNA) and adenoviral constructs to determine the effects of p63 on 21 candidate target genes by RT-PCR, and on repair using a scratch wound assay. We found that basal pHAECs from asthmatic and nonasthmatic donors predominantly expressed the N-terminally truncated p63α variant (ΔNp63α) isoform, with no disease-specific differences in expression. The knockdown of ΔNp63, using specific siRNA, decreased the expression of 11 out of 21 genes associated with epithelial repair and differentiation, including β-catenin, epidermal growth factor receptor, and Jagged1. The loss of ΔNp63 significantly inhibited wound closure (which was associated with the decreased expression of β-catenin and Jagged1), reduced epithelial proliferation as measured by Ki-67 staining, and increased E-cadherin expression, potentially preventing cytokinesis. In conclusion, ΔNp63α is the major isoform expressed in basal pHAECs, and is essential for epithelial wound repair. The role of ΔNp63α in epithelial barrier integrity requires further study to understand its role in health and disease.
Collapse
Affiliation(s)
- Stephanie M B Warner
- 1 University of British Columbia James Hogg Research Centre, Vancouver, British Columbia, Canada
| | | | | | | | | | | | | |
Collapse
|
23
|
Repair of naphthalene-induced acute tracheal injury by basal cells depends on β-catenin. J Thorac Cardiovasc Surg 2013; 148:322-32. [PMID: 24280717 DOI: 10.1016/j.jtcvs.2013.10.039] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 09/25/2013] [Accepted: 10/11/2013] [Indexed: 12/21/2022]
Abstract
OBJECTIVES Little is known about the role of Wnt/β-catenin in postnatal airway homeostasis and basal cell function. This study aimed to investigate the role of Wnt signaling in the self-renewal of basal cells and the involvement of β-catenin in tracheal repair after naphthalene-induced injury. METHODS Mice were treated with naphthalene and injected with 4-hydroxytamoxifen. Injury and repair of the tracheal epithelium after naphthalene-mediated secretory cell depletion was assessed by a immunohistochemical study. The involvement of Wnt and β-catenin signaling in basal cell proliferation was investigated during in vitro expansion. RESULTS Immunohistochemical analysis of tracheal epithelium in wild-type mice showed a reduction in the number of Clara cell secretory protein (CCSP+) and forkhead box transcription factor (Fox-J1+) cells on days 2 to 5 after naphthalene-induced injury; this cell population was regenerated by day 10. After flush labeling, bromodeoxyuridine-positive (BrdU+) cells and Ki67+ cells were observed in tracheal epithelium on days 2 to 5 but not on days 10 and 21. Confocal microscopy visualizing K5+ and BrdU+ cells showed that Wnt3a promotes proliferation of K5+ cells. Immunohistochemical analysis of K5+ and CCSP+ in tracheal epithelial cells from wild-type littermate and K5-Cre-mediated β-catenin knock-out mice showed that on day 3, the number of CCSP+ cells was decreased in all mice. On day 10, CCSP+ cells were present in wild-type littermate mice but absent in conditional knock-out mice. CONCLUSIONS Basal cells serve as stem cells in the tracheal epithelium, regenerating and maintaining tracheal epithelial cells in a mouse model of tracheal injury. β-Catenin is required for proliferation and self-renewal of tracheal epithelial cells.
Collapse
|
24
|
Singh S, Chellappan S. Lung cancer stem cells: Molecular features and therapeutic targets. Mol Aspects Med 2013; 39:50-60. [PMID: 24016594 DOI: 10.1016/j.mam.2013.08.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2013] [Revised: 08/29/2013] [Accepted: 08/29/2013] [Indexed: 12/28/2022]
Abstract
Lung cancers are highly heterogeneous and resistant to available therapeutic agents, with a five year survival rate of less than 15%. Despite significant advances in our knowledge of the genetic alterations and aberrations in signaling pathways, it has been difficult to determine the basis of lung cancer heterogeneity and drug resistance. Cancer stem cell model has attracted a significant amount of attention in recent years as a viable explanation for the heterogeneity, drug resistance, dormancy and recurrence and metastasis of various tumors. At the same time, cancer stem cells have been relatively less characterized in lung cancers. This review summarizes the current understanding of lung cancer stem cells, including their molecular features and signaling pathways that drive their stemness. This review also discusses the potential startegies to inhibit the signaling pathways driving stemness, in an effort to eradicate these cells to combat lung cancer.
Collapse
Affiliation(s)
- Sandeep Singh
- National Institute of Biomedical Genomics (NIBMG), TB Hospital Building, 2nd floor, Kalyani, West Bengal, India
| | - Srikumar Chellappan
- Department of Tumor Biology, H. Lee Moffitt cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, FL 33612, United States.
| |
Collapse
|
25
|
Tanjore H, Degryse AL, Crossno PF, Xu XC, McConaha ME, Jones BR, Polosukhin VV, Bryant AJ, Cheng DS, Newcomb DC, McMahon FB, Gleaves LA, Blackwell TS, Lawson WE. β-catenin in the alveolar epithelium protects from lung fibrosis after intratracheal bleomycin. Am J Respir Crit Care Med 2013; 187:630-9. [PMID: 23306543 DOI: 10.1164/rccm.201205-0972oc] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
RATIONALE Alveolar epithelial cells (AECs) play central roles in the response to lung injury and the pathogenesis of pulmonary fibrosis. OBJECTIVES We aimed to determine the role of β-catenin in alveolar epithelium during bleomycin-induced lung fibrosis. METHODS Genetically modified mice were developed to selectively delete β-catenin in AECs and were crossed to cell fate reporter mice that express β-galactosidase (βgal) in cells of AEC lineage. Mice were given intratracheal bleomycin (0.04 units) and assessed for AEC death, inflammation, lung injury, and fibrotic remodeling. Mouse lung epithelial cells (MLE12) with small interfering RNA knockdown of β-catenin underwent evaluation for wound closure, proliferation, and bleomycin-induced cytotoxicity. MEASUREMENTS AND MAIN RESULTS Increased β-catenin expression was noted in lung parenchyma after bleomycin. Mice with selective deletion of β-catenin in AECs had greater AEC death at 1 week after bleomycin, followed by increased numbers of fibroblasts and enhanced lung fibrosis as determined by semiquantitative histological scoring and total collagen content. However, no differences in lung inflammation or protein levels in bronchoalveolar lavage were noted. In vitro, β-catenin-deficient AECs showed increased bleomycin-induced cytotoxicity as well as reduced proliferation and impaired wound closure. Consistent with these findings, mice with AEC β-catenin deficiency showed delayed recovery after bleomycin. CONCLUSIONS β-Catenin in the alveolar epithelium protects against bleomycin-induced fibrosis. Our studies suggest that AEC survival and wound healing are enhanced through β-catenin-dependent mechanisms. Activation of the developmentally important β-catenin pathway in AECs appears to contribute to epithelial repair after epithelial injury.
Collapse
Affiliation(s)
- Harikrishna Tanjore
- Division of Allergy, Pulmonary, and Critical Care Medicine, Vanderbilt University School of Medicine, 1161 21st Avenue South, Nashville, TN 37232-2650, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Yahaya B. Understanding cellular mechanisms underlying airway epithelial repair: selecting the most appropriate animal models. ScientificWorldJournal 2012; 2012:961684. [PMID: 23049478 PMCID: PMC3461624 DOI: 10.1100/2012/961684] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Accepted: 08/07/2012] [Indexed: 12/18/2022] Open
Abstract
Understanding the mechanisms underlying the process of regeneration and repair of airway epithelial structures demands close characterization of the associated cellular and molecular events. The choice of an animal model system to study these processes and the role of lung stem cells is debatable since ideally the chosen animal model should offer a valid comparison with the human lung. Species differences may include the complex three-dimensional lung structures, cellular composition of the lung airway as well as transcriptional control of the molecular events in response to airway epithelium regeneration, and repair following injury. In this paper, we discuss issues related to the study of the lung repair and regeneration including the role of putative stem cells in small- and large-animal models. At the end of this paper, the author discuss the potential for using sheep as a model which can help bridge the gap between small-animal model systems and humans.
Collapse
Affiliation(s)
- B Yahaya
- Cluster for Regenerative Medicine, Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, Bandar Putra Bertam, Penang, Kepala Batas, Malaysia.
| |
Collapse
|
27
|
Boucherat O, Chakir J, Jeannotte L. The loss of Hoxa5 function promotes Notch-dependent goblet cell metaplasia in lung airways. Biol Open 2012; 1:677-91. [PMID: 23213461 PMCID: PMC3507293 DOI: 10.1242/bio.20121701] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Hox genes encode transcription factors controlling complex developmental processes in various organs. Little is known, however, about how HOX proteins control cell fate. Herein, we demonstrate that the goblet cell metaplasia observed in lung airways from Hoxa5−/− mice originates from the transdifferentiation of Clara cells. Reduced CC10 expression in Hoxa5−/− embryos indicates that altered cell specification occurs prior to birth. The loss of Hoxa5 function does not preclude airway repair after naphthalene exposure, but the regenerated epithelium presents goblet cell metaplasia and less CC10-positive cells, demonstrating the essential role of Hoxa5 for correct differentiation. Goblet cell metaplasia in Hoxa5−/− mice is a FOXA2-independent process. However, it is associated with increased Notch signaling activity. Consistent with these findings, expression levels of activated NOTCH1 and the effector gene HEY2 are enhanced in patients with chronic obstructive pulmonary disease. In vivo administration of a γ-secretase inhibitor attenuates goblet cell metaplasia in Hoxa5−/− mice, highlighting the contribution of Notch signaling to the phenotype and suggesting a potential therapeutic strategy to inhibit goblet cell differentiation and mucus overproduction in airway diseases. In summary, the loss of Hoxa5 function in lung mesenchyme impacts on epithelial cell fate by modulating Notch signaling.
Collapse
Affiliation(s)
- Olivier Boucherat
- Centre de recherche en cancérologie de l'Université Laval, Centre Hospitalier Universitaire de Québec , L'Hôtel-Dieu de Québec, 9 rue McMahon, Québec QC G1R 2J6 , Canada
| | | | | |
Collapse
|
28
|
Hashimoto S, Chen H, Que J, Brockway BL, Drake JA, Snyder JC, Randell SH, Stripp BR. β-Catenin-SOX2 signaling regulates the fate of developing airway epithelium. J Cell Sci 2012; 125:932-42. [PMID: 22421361 PMCID: PMC3311930 DOI: 10.1242/jcs.092734] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Wnt-β-catenin signaling regulates cell fate during organ development and postnatal tissue maintenance, but its contribution to specification of distinct lung epithelial lineages is still unclear. To address this question, we used a Cre recombinase (Cre)-LoxP approach to activate canonical Wnt signaling ectopically in developing lung endoderm. We found that persistent activation of canonical Wnt signaling within distal lung endoderm was permissive for normal development of alveolar epithelium, yet led to the loss of developing bronchiolar epithelium and ectasis of distal conducting airways. Activation of canonical Wnt led to ectopic expression of a lymphoid-enhancing factor and a T-cell factor (LEF and TCF, respectively) and absence of SRY (sex-determining region Y)-box 2 (SOX2) and tumor protein p63 (p63) expression in proximal derivatives. Conditional loss of SOX2 in airways phenocopied epithelial differentiation defects observed with ectopic activation of canonical Wnt. Our data suggest that Wnt negatively regulates a SOX2-dependent signaling program required for developmental progression of the bronchiolar lineage.
Collapse
Affiliation(s)
- Shuichi Hashimoto
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Duke University Medical Center, 106 Research Drive, 2075 MSRBII, DUMC Box 103000, Durham, NC, 27710, USA
- Department of Cell Biology, Duke University Medical Center, Box 3709, Durham, NC, 27710, USA
| | - Huaiyong Chen
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Duke University Medical Center, 106 Research Drive, 2075 MSRBII, DUMC Box 103000, Durham, NC, 27710, USA
- Department of Cell Biology, Duke University Medical Center, Box 3709, Durham, NC, 27710, USA
| | - Jianwen Que
- Department of Cell Biology, Duke University Medical Center, Box 3709, Durham, NC, 27710, USA
| | - Brian L. Brockway
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Duke University Medical Center, 106 Research Drive, 2075 MSRBII, DUMC Box 103000, Durham, NC, 27710, USA
- Department of Cell Biology, Duke University Medical Center, Box 3709, Durham, NC, 27710, USA
| | - Jeffrey A. Drake
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Duke University Medical Center, 106 Research Drive, 2075 MSRBII, DUMC Box 103000, Durham, NC, 27710, USA
- Department of Cell Biology, Duke University Medical Center, Box 3709, Durham, NC, 27710, USA
| | - Joshua C. Snyder
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Duke University Medical Center, 106 Research Drive, 2075 MSRBII, DUMC Box 103000, Durham, NC, 27710, USA
- Department of Cell Biology, Duke University Medical Center, Box 3709, Durham, NC, 27710, USA
| | - Scott H. Randell
- Departments of Cell and Molecular Physiology and Medicine, The University of North Carolina at Chapel Hill, 111 Mason Farm Road, 5200 Medical Biomolecular Research Building, CB 7545 Chapel Hill, NC, 27599-7545, USA
| | - Barry R. Stripp
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Duke University Medical Center, 106 Research Drive, 2075 MSRBII, DUMC Box 103000, Durham, NC, 27710, USA
- Department of Cell Biology, Duke University Medical Center, Box 3709, Durham, NC, 27710, USA
- Author for correspondence ()
| |
Collapse
|
29
|
Giangreco A, Lu L, Vickers C, Teixeira VH, Groot KR, Butler CR, Ilieva EV, George PJ, Nicholson AG, Sage EK, Watt FM, Janes SM. β-Catenin determines upper airway progenitor cell fate and preinvasive squamous lung cancer progression by modulating epithelial-mesenchymal transition. J Pathol 2012; 226:575-87. [PMID: 22081448 PMCID: PMC3434372 DOI: 10.1002/path.3962] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Revised: 11/03/2011] [Accepted: 11/04/2011] [Indexed: 11/22/2022]
Abstract
Human lung cancers, including squamous cell carcinoma (SCC) are a leading cause of death and, whilst evidence suggests that basal stem cells drive SCC initiation and progression, the mechanisms regulating these processes remain unknown. In this study we show that β-catenin signalling regulates basal progenitor cell fate and subsequent SCC progression. In a cohort of preinvasive SCCs we established that elevated basal cell β-catenin signalling is positively associated with increased disease severity, epithelial proliferation and reduced intercellular adhesiveness. We demonstrate that transgene-mediated β-catenin inhibition within keratin 14-expressing basal cells delayed normal airway repair while basal cell-specific β-catenin activation increased cell proliferation, directed differentiation and promoted elements of early epithelial-mesenchymal transition (EMT), including increased Snail transcription and reduced E-cadherin expression. These observations are recapitulated in normal human bronchial epithelial cells in vitro following both pharmacological β-catenin activation and E-cadherin inhibition, and mirrored our findings in preinvasive SCCs. Overall, the data show that airway basal cell β-catenin determines cell fate and its mis-expression is associated with the development of human lung cancer. Copyright © 2012 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
- Adam Giangreco
- Centre for Respiratory Research, University College London, UK
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Smith MK, Koch PJ, Reynolds SD. Direct and indirect roles for β-catenin in facultative basal progenitor cell differentiation. Am J Physiol Lung Cell Mol Physiol 2012; 302:L580-94. [PMID: 22227204 DOI: 10.1152/ajplung.00095.2011] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The conducting airway epithelium is maintained and repaired by endogenous progenitor cells. Dysregulated progenitor cell proliferation and differentiation is thought to contribute to epithelial dysplasia in chronic lung disease. Thus modification of progenitor cell function is an attractive therapeutic goal and one that would be facilitated by knowledge of the molecular pathways that regulate their behavior. We modeled the human tracheobronchial epithelium using primary mouse tracheal epithelial cell cultures that were differentiated by exposure to the air-liquid-interface (ALI). A basal cell subset, termed facultative basal cell progenitors (FBP), initiate these cultures and are the progenitor for tracheal-specific secretory cells, the Clara-like cell, and ciliated cells. To test the hypothesis that β-catenin is necessary for FBP function, ALI cultures were generated from mice homozygous for the Ctnb(flox(E2-6)) allele. In this model, exons 2-6 of the β-catenin gene are flanked by LoxP sites, allowing conditional knockout of β-catenin. The β-catenin locus was modified through transduction with Adenovirus-5-encoding Cre recombinase. This approach generated a mosaic epithelium, comprised of β-catenin wild-type and β-catenin knockout cells. Dual immunostaining and quantitative histomorphometric analyses demonstrated that β-catenin played a direct role in FBP-to-ciliated cell differentiation and that it regulated cell-cell interactions that were necessary for FBP-to-Clara-like cell differentiation. β-catenin was also necessary for FBP proliferation and long-term FBP viability. We conclude that β-catenin is a critical determinant of FBP function and suggest that dysregulation of the β-catenin signaling pathway may contribute to disease pathology.
Collapse
|
31
|
Elf3 plays a role in regulating bronchiolar epithelial repair kinetics following Clara cell-specific injury. J Transl Med 2011; 91:1514-29. [PMID: 21709667 DOI: 10.1038/labinvest.2011.100] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
E74-like transcription factor-3 (Elf3), a member of the E26 transformation-specific transcription factor family, is strongly expressed in epithelial-rich tissues, such as small intestine, fetal lung, and various lung cancers. Although previous studies have shown a defect in terminal differentiation of the small intestinal epithelium of Elf3-deficient (Elf3-/-) mice during embryonic development, very little is known about the role Elf3 may play in repair of the airway epithelium after injury. In order to investigate whether Elf3 is involved in regeneration of the bronchiolar epithelium after Clara cell-specific injury, we administered naphthalene to both wild-type (Elf3+/+) and Elf3-/- mice. Histopathological analysis revealed no significant difference in the extent of naphthalene-induced Clara cell necrosis between Elf3+/+ mice and Elf3-/- mice. In the bronchiolar epithelium of Elf3-/- mice, there was a substantial delay in the kinetics of cell proliferation and mitosis along with Clara cell renewal, whereas in the peribronchiolar interstitium, there was a significantly greater level of cell proliferation and mitosis in Elf3-/- mice than in Elf3+/+ mice. Last, the intensity of immunopositive signal for transforming growth factor-β type II receptor, which is a well-known transcriptional target gene of Elf3 and involved in the induction of epithelial cell differentiation, was significantly lower in the bronchiolar epithelium of Elf3-/- mice when compared with Elf3+/+ mice. Taken together, our results suggest that Elf3 plays an important role in the regulation of lung cell proliferation and differentiation during repair of the injured bronchiolar airway epithelium.
Collapse
|
32
|
Neutrophil transmigration triggers repair of the lung epithelium via beta-catenin signaling. Proc Natl Acad Sci U S A 2011; 108:15990-5. [PMID: 21880956 DOI: 10.1073/pnas.1110144108] [Citation(s) in RCA: 151] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Injury to the epithelium is integral to the pathogenesis of many inflammatory lung diseases, and epithelial repair is a critical determinant of clinical outcome. However, the signaling pathways regulating such repair are incompletely understood. We used in vitro and in vivo models to define these pathways. Human neutrophils were induced to transmigrate across monolayers of human lung epithelial cells in the physiological basolateral-to-apical direction. This allowed study of the neutrophil contribution not only to the initial epithelial injury, but also to its repair, as manifested by restoration of transepithelial resistance and reepithelialization of the denuded epithelium. Microarray analysis of epithelial gene expression revealed that neutrophil transmigration activated β-catenin signaling, and this was verified by real-time PCR, nuclear translocation of β-catenin, and TOPFlash reporter activity. Leukocyte elastase, likely via cleavage of E-cadherin, was required for activation of β-catenin signaling in response to neutrophil transmigration. Knockdown of β-catenin using shRNA delayed epithelial repair. In mice treated with intratracheal LPS or keratinocyte chemokine, neutrophil emigration resulted in activation of β-catenin signaling in alveolar type II epithelial cells, as demonstrated by cyclin D1 expression and/or reporter activity in TOPGAL mice. Attenuation of β-catenin signaling by IQ-1 inhibited alveolar type II epithelial cell proliferation in response to neutrophil migration induced by intratracheal keratinocyte chemokine. We conclude that β-catenin signaling is activated in lung epithelial cells during neutrophil transmigration, likely via elastase-mediated cleavage of E-cadherin, and regulates epithelial repair. This pathway represents a potential therapeutic target to accelerate physiological recovery in inflammatory lung diseases.
Collapse
|
33
|
Weiss DJ, Bertoncello I, Borok Z, Kim C, Panoskaltsis-Mortari A, Reynolds S, Rojas M, Stripp B, Warburton D, Prockop DJ. Stem cells and cell therapies in lung biology and lung diseases. PROCEEDINGS OF THE AMERICAN THORACIC SOCIETY 2011; 8:223-72. [PMID: 21653527 PMCID: PMC3132784 DOI: 10.1513/pats.201012-071dw] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Accepted: 02/03/2011] [Indexed: 11/20/2022]
Abstract
The University of Vermont College of Medicine and the Vermont Lung Center, with support of the National Heart, Lung, and Blood Institute (NHLBI), the Alpha-1 Foundation, the American Thoracic Society, the Emory Center for Respiratory Health,the Lymphangioleiomyomatosis (LAM) Treatment Alliance,and the Pulmonary Fibrosis Foundation, convened a workshop,‘‘Stem Cells and Cell Therapies in Lung Biology and Lung Diseases,’’ held July 26-29, 2009 at the University of Vermont,to review the current understanding of the role of stem and progenitor cells in lung repair after injury and to review the current status of cell therapy approaches for lung diseases. These are rapidly expanding areas of study that provide further insight into and challenge traditional views of the mechanisms of lung repair after injury and pathogenesis of several lung diseases. The goals of the conference were to summarize the current state of the field, discuss and debate current controversies, and identify future research directions and opportunities for both basic and translational research in cell-based therapies for lung diseases.
Collapse
Affiliation(s)
- Daniel J Weiss
- Vermont Lung Center, University of Vermont College of Medicine, Burlington, Vermont 05405, USA.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Beers MF, Morrisey EE. The three R's of lung health and disease: repair, remodeling, and regeneration. J Clin Invest 2011; 121:2065-73. [PMID: 21633173 DOI: 10.1172/jci45961] [Citation(s) in RCA: 228] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
All tissues and organs can be classified according to their ability to repair and regenerate during adult homeostasis and after injury. Some exhibit a high rate of constant cell turnover, while others, such as the lung, exhibit only low-level cell regeneration during normal adult homeostasis but have the ability to rapidly regenerate new cells after injury. Lung regeneration likely involves both activation of progenitor cells as well as cell replacement through proliferation of remaining undamaged cells. The pathways and factors that control this process and its role in disease are only now being explored. In this Review, we will discuss the connection between pathways required for lung development and how the lung responds to injury and disease, with a particular emphasis on recent studies describing the role for the epithelium in repair and regeneration.
Collapse
Affiliation(s)
- Michael F Beers
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-4539, USA.
| | | |
Collapse
|
35
|
Brechbuhl HM, Ghosh M, Smith MK, Smith RW, Li B, Hicks DA, Cole BB, Reynolds PR, Reynolds SD. β-catenin dosage is a critical determinant of tracheal basal cell fate determination. THE AMERICAN JOURNAL OF PATHOLOGY 2011; 179:367-79. [PMID: 21703416 DOI: 10.1016/j.ajpath.2011.03.016] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 03/22/2011] [Accepted: 03/31/2011] [Indexed: 10/18/2022]
Abstract
The purpose of this study was to determine whether β-catenin regulates basal cell fate determination in the mouse trachea. Analysis of TOPGal transgene reporter activity and Wnt/β-catenin pathway gene expression suggested a role for β-catenin in basal cell proliferation and differentiation after naphthalene-mediated Clara-like and ciliated cell depletion. However, these basal cell activities occurred simultaneously, limiting precise determination of the role(s) played by β-catenin. This issue was overcome by analysis of β-catenin signaling in tracheal air-liquid interface cultures. The cultures could be divided into two phases: basal cell proliferation and basal cell differentiation. A role for β-catenin in basal cell proliferation was indicated by activation of the TOPGal transgene on proliferation days 3 to 5 and by transient expression of Myc (alias c-myc). Another peak of TOPGal transgene activity was detected on differentiation days 2 to 10 and was associated with the expression of Axin 2. These results suggest a role for β-catenin in basal to ciliated and basal to Clara-like cell differentiation. Genetic stabilization of β-catenin in basal cells shortened the period of basal cell proliferation but had a minor effect on this process. Persistent β-catenin signaling regulated basal cell fate by driving the generation of ciliated cells and preventing the production of Clara-like cells.
Collapse
|
36
|
Affiliation(s)
- Harold A. Chapman
- Department of Medicine and Cardiovascular Research Institute, University of California, San Francisco, California 94143;
| |
Collapse
|
37
|
Rawlins EL. The building blocks of mammalian lung development. Dev Dyn 2010; 240:463-76. [PMID: 21337459 DOI: 10.1002/dvdy.22482] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2010] [Indexed: 01/26/2023] Open
Abstract
Progress has recently been made in identifying progenitor cell populations in the embryonic lung. Some progenitor cell types have been definitively identified by lineage-tracing studies. However, others are not as well characterized and their existence is inferred on the basis of lung morphology, or mutant phenotypes. Here, I focus on lung development after the specification of the initial lung primordium. The evidence for various lung embryonic progenitor cell types is discussed and future experiments are suggested. The regulation of progenitor proliferation in the embryonic lung, and its coordinate control with morphogenesis, is also discussed. In addition, the relationship between embryonic and adult lung progenitors is considered.
Collapse
Affiliation(s)
- Emma L Rawlins
- Gurdon Institute and Department of Pathology, University of Cambridge, Cambridge, United Kingdom.
| |
Collapse
|
38
|
Cole BB, Smith RW, Jenkins KM, Graham BB, Reynolds PR, Reynolds SD. Tracheal Basal cells: a facultative progenitor cell pool. THE AMERICAN JOURNAL OF PATHOLOGY 2010; 177:362-76. [PMID: 20522644 DOI: 10.2353/ajpath.2010.090870] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Analysis of lineage relationships in the naphthalene-injured tracheal epithelium demonstrated that two multipotential keratin 14-expressing cells (K14ECs) function as progenitors for Clara and ciliated cells. These K14EC were distinguished by their self-renewal capacity and were hypothesized to reside at the stem and transit amplifying tiers of a tissue-specific stem cell hierarchy. In this study, we used gene expression and histomorphometric analysis of the steady-state and naphthalene-injured trachea to evaluate the predictions of this model. We found that the steady-state tracheal epithelium is maintained by two progenitor cell pools, secretory and basal cells, and the latter progenitor pool is further divided into two subsets, keratin 14-negative and -positive. After naphthalene-mediated depletion of the secretory and ciliated cell types, the two basal cell pools coordinate to restore the epithelium. Both basal cell types up-regulate keratin 14 and generate a broadly distributed, abundant, and highly mitotic cell pool. Furthermore, basal cell proliferation is associated with generation of differentiated Clara and ciliated cells. The uniform distribution of basal cell progenitors and of their differentiated progeny leads us to propose that the hierarchical organization of tracheal reparative cells be revised to include a facultative basal cell progenitor pool.
Collapse
Affiliation(s)
- Brook B Cole
- Department of Pediatrics, Division of Cell Biology, National Jewish Health, Denver, Colorado, USA
| | | | | | | | | | | |
Collapse
|
39
|
Sullivan JP, Minna JD, Shay JW. Evidence for self-renewing lung cancer stem cells and their implications in tumor initiation, progression, and targeted therapy. Cancer Metastasis Rev 2010; 29:61-72. [PMID: 20094757 DOI: 10.1007/s10555-010-9216-5] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The discovery of rare tumor cells with stem cell features first in leukemia and later in solid tumors has emerged as an important area in cancer research. It has been determined that these stem-like tumor cells, termed cancer stem cells, are the primary cellular component within a tumor that drives disease progression and metastasis. In addition to their stem-like ability to self-renew and differentiate, cancer stem cells are also enriched in cells resistant to conventional radiation therapy and to chemotherapy. The immediate implications of this new tumor growth paradigm not only require a re-evaluation of how tumors are initiated, but also on how tumors should be monitored and treated. However, despite the relatively rapid pace of cancer stem cell research in solid tumors such as breast, brain, and colon cancers, similar progress in lung cancer remains hampered in part due to an incomplete understanding of lung epithelial stem cell hierarchy and the complex heterogeneity of the disease. In this review, we provide a critical summary of what is known about the role of normal and malignant lung stem cells in tumor development, the progress in characterizing lung cancer stem cells and the potential for therapeutically targeting pathways of lung cancer stem cell self-renewal.
Collapse
Affiliation(s)
- James P Sullivan
- Hamon Center for Therapeutic Oncology Research, UT Southwestern Medical Center, Dallas, TX, 75390, USA.
| | | | | |
Collapse
|
40
|
Crosby LM, Waters CM. Epithelial repair mechanisms in the lung. Am J Physiol Lung Cell Mol Physiol 2010; 298:L715-31. [PMID: 20363851 DOI: 10.1152/ajplung.00361.2009] [Citation(s) in RCA: 502] [Impact Index Per Article: 35.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The recovery of an intact epithelium following lung injury is critical for restoration of lung homeostasis. The initial processes following injury include an acute inflammatory response, recruitment of immune cells, and epithelial cell spreading and migration upon an autologously secreted provisional matrix. Injury causes the release of factors that contribute to repair mechanisms including members of the epidermal growth factor and fibroblast growth factor families (TGF-alpha, KGF, HGF), chemokines (MCP-1), interleukins (IL-1beta, IL-2, IL-4, IL-13), and prostaglandins (PGE(2)), for example. These factors coordinate processes involving integrins, matrix materials (fibronectin, collagen, laminin), matrix metalloproteinases (MMP-1, MMP-7, MMP-9), focal adhesions, and cytoskeletal structures to promote cell spreading and migration. Several key signaling pathways are important in regulating these processes, including sonic hedgehog, Rho GTPases, MAP kinase pathways, STAT3, and Wnt. Changes in mechanical forces may also affect these pathways. Both localized and distal progenitor stem cells are recruited into the injured area, and proliferation and phenotypic differentiation of these cells leads to recovery of epithelial function. Persistent injury may contribute to the pathology of diseases such as asthma, chronic obstructive pulmonary disease, and pulmonary fibrosis. For example, dysregulated repair processes involving TGF-beta and epithelial-mesenchymal transition may lead to fibrosis. This review focuses on the processes of epithelial restitution, the localization and role of epithelial progenitor stem cells, the initiating factors involved in repair, and the signaling pathways involved in these processes.
Collapse
Affiliation(s)
- Lynn M Crosby
- Departments of 1Physiology, University of Tennessee Health Science Center, Memphis, TN 38163-0001, USA
| | | |
Collapse
|
41
|
Minoo P, Li C. Cross-talk between transforming growth factor-beta and Wingless/Int pathways in lung development and disease. Int J Biochem Cell Biol 2010; 42:809-12. [PMID: 20219694 DOI: 10.1016/j.biocel.2010.02.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Revised: 02/10/2010] [Accepted: 02/18/2010] [Indexed: 12/20/2022]
Abstract
Lung development depends on accurate and precise patterning of a pulmonary anlagen, consisting of both endodermally and mesodermally derived progenitor cells. In this process, the need to establish communication and control among individual cells is paramount. Transforming growth factor-beta (TGFbeta) and Wingless/int (Wnt) signaling pathways serve this need. The individual functional repertoire of the two pathways is further expanded by cross-talk and integration of signaling at multiple levels taking advantage of their hard-wired multi-component signal transduction platforms. Cross-talk creates the possibility for both specificity and versatility in signaling during development and during repair of injured tissue. Understanding the mechanics and the physiological implications of this cross-talk is necessary for therapeutic or preventive targeting of either TGFbeta or Wnt signaling pathways.
Collapse
Affiliation(s)
- Parviz Minoo
- Division of Neonatology, Department of Pediatrics, University of Southern California Keck School of Medicine, Los Angeles, CA 90033, USA.
| | | |
Collapse
|
42
|
Warburton D, El-Hashash A, Carraro G, Tiozzo C, Sala F, Rogers O, De Langhe S, Kemp PJ, Riccardi D, Torday J, Bellusci S, Shi W, Lubkin SR, Jesudason E. Lung organogenesis. Curr Top Dev Biol 2010; 90:73-158. [PMID: 20691848 DOI: 10.1016/s0070-2153(10)90003-3] [Citation(s) in RCA: 290] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Developmental lung biology is a field that has the potential for significant human impact: lung disease at the extremes of age continues to cause major morbidity and mortality worldwide. Understanding how the lung develops holds the promise that investigators can use this knowledge to aid lung repair and regeneration. In the decade since the "molecular embryology" of the lung was first comprehensively reviewed, new challenges have emerged-and it is on these that we focus the current review. Firstly, there is a critical need to understand the progenitor cell biology of the lung in order to exploit the potential of stem cells for the treatment of lung disease. Secondly, the current familiar descriptions of lung morphogenesis governed by growth and transcription factors need to be elaborated upon with the reinclusion and reconsideration of other factors, such as mechanics, in lung growth. Thirdly, efforts to parse the finer detail of lung bud signaling may need to be combined with broader consideration of overarching mechanisms that may be therapeutically easier to target: in this arena, we advance the proposal that looking at the lung in general (and branching in particular) in terms of clocks may yield unexpected benefits.
Collapse
Affiliation(s)
- David Warburton
- The Saban Research Institute, Childrens Hospital Los Angeles, Los Angeles, California, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Tompkins DH, Besnard V, Lange AW, Wert SE, Keiser AR, Smith AN, Lang R, Whitsett JA. Sox2 is required for maintenance and differentiation of bronchiolar Clara, ciliated, and goblet cells. PLoS One 2009; 4:e8248. [PMID: 20011520 PMCID: PMC2788414 DOI: 10.1371/journal.pone.0008248] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Accepted: 11/17/2009] [Indexed: 11/25/2022] Open
Abstract
The bronchioles of the murine lung are lined by a simple columnar epithelium composed of ciliated, Clara, and goblet cells that together mediate barrier function, mucociliary clearance and innate host defense, vital for pulmonary homeostasis. In the present work, we demonstrate that expression of Sox2 in Clara cells is required for the differentiation of ciliated, Clara, and goblet cells that line the bronchioles of the postnatal lung. The gene was selectively deleted in Clara cells utilizing Scgb1a1-Cre, causing the progressive loss of Sox2 in the bronchioles during perinatal and postnatal development. The rate of bronchiolar cell proliferation was decreased and associated with the formation of an undifferentiated, cuboidal-squamous epithelium lacking the expression of markers of Clara cells (Scgb1a1), ciliated cells (FoxJ1 and α-tubulin), and goblet cells (Spdef and Muc5AC). By adulthood, bronchiolar cell numbers were decreased and Sox2 was absent in extensive regions of the bronchiolar epithelium, at which time residual Sox2 expression was primarily restricted to selective niches of CGRP staining neuroepithelial cells. Allergen-induced goblet cell differentiation and mucus production was absent in the respiratory epithelium lacking Sox2. In vitro, Sox2 activated promoter-luciferase reporter constructs for differentiation markers characteristic of Clara, ciliated, and goblet cells, Scgb1a1, FoxJ1, and Agr2, respectively. Sox2 physically interacted with Smad3 and inhibited TGF-β1/Smad3-mediated transcriptional activity in vitro, a pathway that negatively regulates proliferation. Sox2 is required for proliferation and differentiation of Clara cells that serve as the progenitor cells from which Clara, ciliated, and goblet cells are derived.
Collapse
Affiliation(s)
- David H. Tompkins
- Division of Pulmonary Biology in the Perinatal Institute and Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Valérie Besnard
- Division of Pulmonary Biology in the Perinatal Institute and Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Alexander W. Lange
- Division of Pulmonary Biology in the Perinatal Institute and Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Susan E. Wert
- Division of Pulmonary Biology in the Perinatal Institute and Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Angela R. Keiser
- Division of Pulmonary Biology in the Perinatal Institute and Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - April N. Smith
- Division of Pulmonary Biology in the Perinatal Institute and Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Richard Lang
- Division of Pulmonary Biology in the Perinatal Institute and Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Jeffrey A. Whitsett
- Division of Pulmonary Biology in the Perinatal Institute and Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
- * E-mail:
| |
Collapse
|
44
|
Blaisdell CJ, Gail DB, Nabel EG. National Heart, Lung, and Blood Institute perspective: lung progenitor and stem cells--gaps in knowledge and future opportunities. Stem Cells 2009; 27:2263-70. [PMID: 19522010 PMCID: PMC2962803 DOI: 10.1002/stem.148] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Because the lung stem cell field is so new, there remain many unanswered questions that are being addressed regarding the identification, location, and role of exogenous and endogenous stem and progenitor cell populations in growth, regeneration, and repair of the lung. Advancing lung stem cell biology will require multidisciplinary teams and a long term effort to unravel the biologic processes of stem cells in the lung. While no clinical research in lung stem cell therapies are currently funded by NHLBI, the knowledge gained by understanding the basic biology of the lung stem cell populations will be needed to translate to diagnostic and therapeutic strategies in the future.
Collapse
Affiliation(s)
- Carol J Blaisdell
- National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
| | | | | |
Collapse
|
45
|
Flozak AS, Lam AP, Russell S, Jain M, Peled ON, Sheppard KA, Beri R, Mutlu GM, Budinger GRS, Gottardi CJ. Beta-catenin/T-cell factor signaling is activated during lung injury and promotes the survival and migration of alveolar epithelial cells. J Biol Chem 2009; 285:3157-67. [PMID: 19933277 DOI: 10.1074/jbc.m109.070326] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The Wnt/beta-catenin signaling cascade activates genes that allow cells to adopt particular identities throughout development. In adult self-renewing tissues like intestine and blood, activation of the Wnt pathway maintains a progenitor phenotype, whereas forced inhibition of this pathway promotes differentiation. In the lung alveolus, type 2 epithelial cells (AT2) have been described as progenitors for the type 1 cell (AT1), but whether AT2 progenitors use the same signaling mechanisms to control differentiation as rapidly renewing tissues is not known. We show that adult AT2 cells do not exhibit constitutive beta-catenin signaling in vivo, using the AXIN2(+/LacZ) reporter mouse, or after fresh isolation of an enriched population of AT2 cells. Rather, this pathway is activated in lungs subjected to bleomycin-induced injury, as well as upon placement of AT2 cells in culture. Forced inhibition of beta-catenin/T-cell factor signaling in AT2 cultures leads to increased cell death. Cells that survive show reduced migration after wounding and reduced expression of AT1 cell markers (T1alpha and RAGE). These results suggest that AT2 cells may function as facultative progenitors, where activation of Wnt/beta-catenin signaling during lung injury promotes alveolar epithelial survival, migration, and differentiation toward an AT1-like phenotype.
Collapse
Affiliation(s)
- Annette S Flozak
- Department of Medicine, Division of Pulmonary and Critical Care, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Adler KB, Matalon S. Highlights of the November Issue. Am J Respir Cell Mol Biol 2009. [DOI: 10.1165/rcmb.2009-2011ed] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|