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Wozniak PS, Makhoul L, Botros MM. Bronchopulmonary dysplasia in adults: Exploring pathogenesis and phenotype. Pediatr Pulmonol 2024; 59:540-551. [PMID: 38050796 DOI: 10.1002/ppul.26795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 11/26/2023] [Accepted: 11/27/2023] [Indexed: 12/06/2023]
Abstract
This review highlights both the longstanding impact of bronchopulmonary dysplasia (BPD) on the health of adult survivors of prematurity and the pressing need for prospective, longitudinal studies of this population. Conservatively, there are an estimated 1,000,000 survivors of BPD in the United States alone. Unfortunately, most of the available literature regarding outcomes of lung disease due to prematurity naturally focuses on pediatric patients in early or middle childhood, and the relative amount of literature on adult survivors is scant. As the number of adult survivors of BPD continues to increase, it is essential that both adult and pediatric pulmonologists have a comprehensive understanding of the pathophysiology and underlying disease process, including the molecular signaling pathways and pro-inflammatory modulators that contribute to the pathogenesis of BPD. We summarize the most common presenting symptoms for adults with BPD and identify the critical challenges adult pulmonologists face in managing the care of survivors of prematurity. Specifically, these challenges include the wide variability of the clinical presentation of adult patients, comorbid cardiopulmonary complications, and the paucity of longitudinal data available on these patients. Adult survivors of BPD have even required lung transplantation, indicating the high burden of morbidity that can result from premature birth and subsequent lung injury. In addition, we analyze the disparate symptoms and management approach to adults with "old" BPD versus "new" BPD. The aim of this review is to assist pulmonologists in understanding the underlying pathophysiology of BPD and to improve clinical recognition of this increasingly common pulmonary disease.
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Affiliation(s)
- Phillip S Wozniak
- Department of Internal Medicine, Kansas City, Missouri, USA
- Department of Pediatrics, Children's Mercy Hospital, Kansas City, Missouri, USA
- University of Missouri Kansas City School of Medicine, Kansas City, Missouri, USA
| | - Lara Makhoul
- University of Missouri Kansas City School of Medicine, Kansas City, Missouri, USA
| | - Mena M Botros
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Internal Medicine, Houston Methodist Hospital, Houston, Texas, USA
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2
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Riccetti MR, Green J, Taylor TJ, Perl AKT. Prenatal FGFR2 Signaling via PI3K/AKT Specifies the PDGFRA + Myofibroblast. Am J Respir Cell Mol Biol 2024; 70:63-77. [PMID: 37734036 PMCID: PMC10768833 DOI: 10.1165/rcmb.2023-0245oc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 09/21/2023] [Indexed: 09/23/2023] Open
Abstract
It is well known that FGFR2 (fibroblast growth factor receptor 2) signaling is critical for proper lung development. Recent studies demonstrate that epithelial FGFR2 signaling during the saccular phase of lung development (sacculation) regulates alveolar type 1 (AT1) and AT2 cell differentiation. During sacculation, PDGFRA (platelet-derived growth factor receptor-α)-positive lung fibroblasts exist as three functional subtypes: contractile myofibroblasts, extracellular matrix-producing matrix fibroblasts, and lipofibroblasts. All three subtypes are required during alveolarization to establish a niche that supports AT2 epithelial cell self-renewal and AT1 epithelial cell differentiation. FGFR2 signaling directs myofibroblast differentiation in PDGFRA+ fibroblasts during alveolar reseptation after pneumonectomy. However, it remains unknown if FGFR2 signaling regulates PDGFRA+ myo-, matrix, or lipofibroblast differentiation during sacculation. In this study, FGFR2 signaling was inhibited by temporal expression of a secreted dominant-negative FGFR2b (dnFGFR2) by AT2 cells from embryonic day (E) 16.5 to E18.5. Fibroblast and epithelial differentiation were analyzed at E18.5 and postnatal days 7 and 21. At all time points, the number of myofibroblasts was reduced and the number of lipo-/matrix fibroblasts was increased. AT2 cells are increased and AT1 cells are reduced postnatally, but not at E18.5. Similarly, in organoids made with PDGFRA+ fibroblasts from dnFGFR2 lungs, increased AT2 cells and reduced AT1 cells were observed. In vitro treatment of primary wild-type E16.5 adherent saccular lung fibroblasts with recombinant dnFGFR2b/c resulted in reduced myofibroblast contraction. Treatment with the PI3K/AKT activator 740 Y-P rescued the lack of myofibroblast differentiation caused by dnFGFR2b/2c. Moreover, treatment with the PI3K/AKT activator 740 Y-P rescued myofibroblast differentiation in E18.5 fibroblasts isolated from dnFGFR2 lungs.
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Affiliation(s)
- Matthew R. Riccetti
- Division of Neonatology and Pulmonary Biology and
- Molecular and Developmental Biology Graduate Program, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - Jenna Green
- Division of Neonatology and Pulmonary Biology and
| | - Thomas J. Taylor
- Division of Neonatology and Pulmonary Biology and
- College of Arts and Sciences, University of Cincinnati, Cincinnati, Ohio; and
| | - Anne-Karina T. Perl
- Division of Neonatology and Pulmonary Biology and
- Molecular and Developmental Biology Graduate Program, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
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3
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Khan IS, Molina C, Ren X, Auyeung VC, Cohen M, Tsukui T, Atakilit A, Sheppard D. Impaired Myofibroblast Proliferation is a Central Feature of Pathologic Post-Natal Alveolar Simplification. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.12.21.572766. [PMID: 38187712 PMCID: PMC10769348 DOI: 10.1101/2023.12.21.572766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Premature infants with bronchopulmonary dysplasia (BPD) have impaired alveolar gas exchange due to alveolar simplification and dysmorphic pulmonary vasculature. Advances in clinical care have improved survival for infants with BPD, but the overall incidence of BPD remains unchanged because we lack specific therapies to prevent this disease. Recent work has suggested a role for increased transforming growth factor-beta (TGFβ) signaling and myofibroblast populations in BPD pathogenesis, but the functional significance of each remains unclear. Here, we utilize multiple murine models of alveolar simplification and comparative single-cell RNA sequencing to identify shared mechanisms that could contribute to BPD pathogenesis. Single-cell RNA sequencing reveals a profound loss of myofibroblasts in two models of BPD and identifies gene expression signatures of increased TGFβ signaling, cell cycle arrest, and impaired proliferation in myofibroblasts. Using pharmacologic and genetic approaches, we find no evidence that increased TGFβ signaling in the lung mesenchyme contributes to alveolar simplification. In contrast, this is likely a failed compensatory response, since none of our approaches to inhibit TGFb signaling protect mice from alveolar simplification due to hyperoxia while several make simplification worse. In contrast, we find that impaired myofibroblast proliferation is a central feature in several murine models of BPD, and we show that inhibiting myofibroblast proliferation is sufficient to cause pathologic alveolar simplification. Our results underscore the importance of impaired myofibroblast proliferation as a central feature of alveolar simplification and suggest that efforts to reverse this process could have therapeutic value in BPD.
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Affiliation(s)
- Imran S. Khan
- Division of Neonatology, Department of Pediatrics, UCSF
- Cardiovascular Research Institute, UCSF
| | - Christopher Molina
- Cardiovascular Research Institute, UCSF
- Division of Pulmonary, Critical Care, Allergy, and Sleep, UCSF
- Department of Medicine, UCSF
| | - Xin Ren
- Cardiovascular Research Institute, UCSF
- Division of Pulmonary, Critical Care, Allergy, and Sleep, UCSF
- Department of Medicine, UCSF
| | - Vincent C. Auyeung
- Cardiovascular Research Institute, UCSF
- Division of Pulmonary, Critical Care, Allergy, and Sleep, UCSF
- Department of Medicine, UCSF
| | - Max Cohen
- Division of Pulmonary, Critical Care, Allergy, and Sleep, UCSF
- Department of Medicine, UCSF
| | - Tatsuya Tsukui
- Cardiovascular Research Institute, UCSF
- Division of Pulmonary, Critical Care, Allergy, and Sleep, UCSF
- Department of Medicine, UCSF
| | - Amha Atakilit
- Cardiovascular Research Institute, UCSF
- Division of Pulmonary, Critical Care, Allergy, and Sleep, UCSF
- Department of Medicine, UCSF
| | - Dean Sheppard
- Cardiovascular Research Institute, UCSF
- Division of Pulmonary, Critical Care, Allergy, and Sleep, UCSF
- Department of Medicine, UCSF
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4
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Trempus CS, Papas BN, Sifre MI, Bortner CD, Scappini E, Tucker CJ, Xu X, Johnson KL, Deterding LJ, Williams JG, Johnson DJ, Li JL, Sutton D, Ganta C, Mahapatra D, Arif M, Basu A, Pommerolle L, Cinar R, Perl AK, Garantziotis S. Functional Pdgfra fibroblast heterogeneity in normal and fibrotic mouse lung. JCI Insight 2023; 8:e164380. [PMID: 37824216 PMCID: PMC10721331 DOI: 10.1172/jci.insight.164380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 10/06/2023] [Indexed: 10/14/2023] Open
Abstract
Aberrant fibroblast function plays a key role in the pathogenesis of idiopathic pulmonary fibrosis, a devastating disease of unrelenting extracellular matrix deposition in response to lung injury. Platelet-derived growth factor α-positive (Pdgfra+) lipofibroblasts (LipoFBs) are essential for lung injury response and maintenance of a functional alveolar stem cell niche. Little is known about the effects of lung injury on LipoFB function. Here, we used single-cell RNA-Seq (scRNA-Seq) technology and PdgfraGFP lineage tracing to generate a transcriptomic profile of Pdgfra+ fibroblasts in normal and injured mouse lungs 14 days after bleomycin exposure, generating 11 unique transcriptomic clusters that segregated according to treatment. While normal and injured LipoFBs shared a common gene signature, injured LipoFBs acquired fibrogenic pathway activity with an attenuation of lipogenic pathways. In a 3D organoid model, injured Pdgfra+ fibroblast-supported organoids were morphologically distinct from those cultured with normal fibroblasts, and scRNA-Seq analysis suggested distinct transcriptomic changes in alveolar epithelia supported by injured Pdgfra+ fibroblasts. In summary, while LipoFBs in injured lung have not migrated from their niche and retain their lipogenic identity, they acquire a potentially reversible fibrogenic profile, which may alter the kinetics of epithelial regeneration and potentially contribute to dysregulated repair, leading to fibrosis.
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Affiliation(s)
| | | | | | | | | | | | - Xin Xu
- Epigenetics & Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina, USA
| | - Katina L. Johnson
- Epigenetics & Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina, USA
| | - Leesa J. Deterding
- Epigenetics & Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina, USA
| | - Jason G. Williams
- Epigenetics & Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina, USA
| | | | | | - Deloris Sutton
- Comparative & Molecular Pathogenesis Branch, National Institute of Environmental Health Sciences, Division of Translational Toxicology, Research Triangle Park, North Carolina, USA
| | - Charan Ganta
- Comparative & Molecular Pathogenesis Branch, National Institute of Environmental Health Sciences, Division of Translational Toxicology, Research Triangle Park, North Carolina, USA
- Inotiv, Research Triangle Park, North Carolina, USA
| | | | - Muhammad Arif
- Section on Fibrotic Disorders, and
- Laboratory of Cardiovascular Physiology and Tissue Injury, National Institute on Alcohol Abuse and Alcoholism, NIH, Rockville, Maryland, USA
| | | | | | | | - Anne K. Perl
- Division of Pulmonary Biology, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
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Hirani DV, Thielen F, Mansouri S, Danopoulos S, Vohlen C, Haznedar-Karakaya P, Mohr J, Wilke R, Selle J, Grosch T, Mizik I, Odenthal M, Alvira CM, Kuiper-Makris C, Pryhuber GS, Pallasch C, van Koningsbruggen-Rietschel S, Al-Alam D, Seeger W, Savai R, Dötsch J, Alejandre Alcazar MA. CXCL10 deficiency limits macrophage infiltration, preserves lung matrix, and enables lung growth in bronchopulmonary dysplasia. Inflamm Regen 2023; 43:52. [PMID: 37876024 PMCID: PMC10594718 DOI: 10.1186/s41232-023-00301-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 10/10/2023] [Indexed: 10/26/2023] Open
Abstract
Preterm infants with oxygen supplementation are at high risk for bronchopulmonary dysplasia (BPD), a neonatal chronic lung disease. Inflammation with macrophage activation is central to the pathogenesis of BPD. CXCL10, a chemotactic and pro-inflammatory chemokine, is elevated in the lungs of infants evolving BPD and in hyperoxia-based BPD in mice. Here, we tested if CXCL10 deficiency preserves lung growth after neonatal hyperoxia by preventing macrophage activation. To this end, we exposed Cxcl10 knockout (Cxcl10-/-) and wild-type mice to an experimental model of hyperoxia (85% O2)-induced neonatal lung injury and subsequent regeneration. In addition, cultured primary human macrophages and murine macrophages (J744A.1) were treated with CXCL10 and/or CXCR3 antagonist. Our transcriptomic analysis identified CXCL10 as a central hub in the inflammatory network of neonatal mouse lungs after hyperoxia. Quantitative histomorphometric analysis revealed that Cxcl10-/- mice are in part protected from reduced alveolar. These findings were related to the preserved spatial distribution of elastic fibers, reduced collagen deposition, and protection from macrophage recruitment/infiltration to the lungs in Cxcl10-/- mice during acute injury and regeneration. Complimentary, studies with cultured human and murine macrophages showed that hyperoxia induces Cxcl10 expression that in turn triggers M1-like activation and migration of macrophages through CXCR3. Finally, we demonstrated a temporal increase of macrophage-related CXCL10 in the lungs of infants with BPD. In conclusion, our data demonstrate macrophage-derived CXCL10 in experimental and clinical BPD that drives macrophage chemotaxis through CXCR3, causing pro-fibrotic lung remodeling and arrest of alveolarization. Thus, targeting the CXCL10-CXCR3 axis could offer a new therapeutic avenue for BPD.
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Affiliation(s)
- Dharmesh V Hirani
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
- Universities of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Institute for Lung Health (ILH) and Cardio-Pulmonary Institute (CPI), Gießen, Germany
| | - Florian Thielen
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
| | - Siavash Mansouri
- Department of Lung Development and Remodeling, Max-Planck-Institute for Heart and Lung Research, Member of the German Center for Lung Research (DZL), Bad Nauheim, Germany
| | - Soula Danopoulos
- Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - Christina Vohlen
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
- Universities of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Institute for Lung Health (ILH) and Cardio-Pulmonary Institute (CPI), Gießen, Germany
- Department of Pediatric and Adolescent Medicine, Faculty of Medicine, University Hospital Cologne, and University of Cologne, Cologne, Germany
| | - Pinar Haznedar-Karakaya
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
| | - Jasmine Mohr
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
| | - Rebecca Wilke
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
| | - Jaco Selle
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
| | - Thomas Grosch
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
| | - Ivana Mizik
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
| | - Margarete Odenthal
- Center for Molecular Medicine Cologne (CMMC), University Hospital Cologne, Faculty of Medicine, and University of Cologne, Cologne, Germany
- Institute for Pathology, University Hospital Cologne, Faculty of Medicine, and University of Cologne, Cologne, Germany
| | - Cristina M Alvira
- Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA
| | - Celien Kuiper-Makris
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany
- Center for Molecular Medicine Cologne (CMMC), University Hospital Cologne, Faculty of Medicine, and University of Cologne, Cologne, Germany
| | - Gloria S Pryhuber
- Department of Pediatrics, Division of Neonatology, University of Rochester Medical Center, Rochester, NY, USA
| | - Christian Pallasch
- Department I of Internal Medicine, Center for Integrated Oncology (CIO) Köln-Bonn, University of Cologne, Cologne, Germany
| | - S van Koningsbruggen-Rietschel
- Department of Pediatric and Adolescent Medicine, Faculty of Medicine, University Hospital Cologne, and University of Cologne, Cologne, Germany
| | - Denise Al-Alam
- Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA, USA
| | - Werner Seeger
- Universities of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Institute for Lung Health (ILH) and Cardio-Pulmonary Institute (CPI), Gießen, Germany
- Department of Lung Development and Remodeling, Max-Planck-Institute for Heart and Lung Research, Member of the German Center for Lung Research (DZL), Bad Nauheim, Germany
| | - Rajkumar Savai
- Universities of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Institute for Lung Health (ILH) and Cardio-Pulmonary Institute (CPI), Gießen, Germany
- Department of Lung Development and Remodeling, Max-Planck-Institute for Heart and Lung Research, Member of the German Center for Lung Research (DZL), Bad Nauheim, Germany
| | - Jörg Dötsch
- Department of Pediatric and Adolescent Medicine, Faculty of Medicine, University Hospital Cologne, and University of Cologne, Cologne, Germany
| | - Miguel A Alejandre Alcazar
- Department of Pediatric and Adolescent Medicine, Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital Cologne, Faculty of Medicine, University of Cologne, Kerpener Strasse 62, Cologne, 50937, Germany.
- Universities of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Institute for Lung Health (ILH) and Cardio-Pulmonary Institute (CPI), Gießen, Germany.
- Center for Molecular Medicine Cologne (CMMC), University Hospital Cologne, Faculty of Medicine, and University of Cologne, Cologne, Germany.
- Cologne Excellence Cluster On Stress Responses in Aging-Associated Diseases (CECAD), University Hospital of Cologne, University of Cologne, Cologne, Germany.
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Yie TA, Loomis CA, Nowatzky J, Khodadadi-Jamayran A, Lin Z, Cammer M, Barnett C, Mezzano V, Alu M, Novick JA, Munger JS, Kugler MC. Hedgehog and Platelet-derived Growth Factor Signaling Intersect during Postnatal Lung Development. Am J Respir Cell Mol Biol 2023; 68:523-536. [PMID: 36693140 PMCID: PMC10174164 DOI: 10.1165/rcmb.2022-0269oc] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Accepted: 01/24/2023] [Indexed: 01/26/2023] Open
Abstract
Normal lung development critically depends on HH (Hedgehog) and PDGF (platelet-derived growth factor) signaling, which coordinate mesenchymal differentiation and proliferation. PDGF signaling is required for postnatal alveolar septum formation by myofibroblasts. Recently, we demonstrated a requirement for HH in postnatal lung development involving alveolar myofibroblast differentiation. Given shared features of HH signaling and PDGF signaling and their impact on this key cell type, we sought to clarify their relationship during murine postnatal lung development. Timed experiments revealed that HH inhibition phenocopies the key lung myofibroblast phenotypes of Pdgfa (platelet-derived growth factor subunit A) and Pdgfra (platelet-derived growth factor receptor alpha) knockouts during secondary alveolar septation. Using a dual signaling reporter, Gli1lZ;PdgfraEGFP, we show that HH and PDGF pathway intermediates are concurrently expressed during alveolar septal myofibroblast accumulation, suggesting pathway convergence in the generation of lung myofibroblasts. Consistent with this hypothesis, HH inhibition reduces Pdgfra expression and diminishes the number of Pdgfra-positive and Pdgfra-lineage cells in postnatal lungs. Bulk RNA sequencing data of Pdgfra-expressing cells from Postnatal Day 8 (P8) lungs show that HH inhibition alters the expression not only of well-established HH targets but also of several putative PDGF target genes. This, together with the presence of Gli-binding sites in PDGF target genes, suggests HH input into PDGF signaling. We identified these HH/PDGF targets in several postnatal lung mesenchymal cell populations, including myofibroblasts, using single-cell transcriptomic analysis. Collectively, our data indicate that HH signaling and PDGF signaling intersect to support myofibroblast/fibroblast function during secondary alveolar septum formation. Moreover, they provide a molecular foundation relevant to perinatal lung diseases associated with impaired alveolarization.
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Affiliation(s)
- Ting-An Yie
- Division of Pulmonary, Critical Care and Sleep Medicine and
| | | | - Johannes Nowatzky
- Division of Rheumatology, Department of Medicine
- Department of Pathology
| | | | | | | | - Clea Barnett
- Division of Pulmonary, Critical Care and Sleep Medicine and
| | | | | | | | - John S. Munger
- Division of Pulmonary, Critical Care and Sleep Medicine and
- Department of Cell Biology, School of Medicine and Langone Medical Center, New York University, New York, New York
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7
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Hughes T, Dijkstra KK, Rawlins EL, Hynds RE. Open questions in human lung organoid research. Front Pharmacol 2023; 13:1083017. [PMID: 36712670 PMCID: PMC9880211 DOI: 10.3389/fphar.2022.1083017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 12/28/2022] [Indexed: 01/15/2023] Open
Abstract
Organoids have become a prominent model system in pulmonary research. The ability to establish organoid cultures directly from patient tissue has expanded the repertoire of physiologically relevant preclinical model systems. In addition to their derivation from adult lung stem/progenitor cells, lung organoids can be derived from fetal tissue or induced pluripotent stem cells to fill a critical gap in modelling pulmonary development in vitro. Recent years have seen important progress in the characterisation and refinement of organoid culture systems. Here, we address several open questions in the field, including how closely organoids recapitulate the tissue of origin, how well organoids recapitulate patient cohorts, and how well organoids capture diversity within a patient. We advocate deeper characterisation of models using single cell technologies, generation of more diverse organoid biobanks and further standardisation of culture media.
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Affiliation(s)
- Tessa Hughes
- Wellcome Trust/CRUK Gurdon Institute and Department Physiology, Development and Neuroscience, University of Cambridge, Cambridge, United Kingdom
| | - Krijn K. Dijkstra
- Department of Molecular Oncology and Immunology, The Netherlands Cancer Institute, Amsterdam, Netherlands
- Cancer Evolution and Genome Instability Laboratory, The Francis Crick Institute, London, United Kingdom
| | - Emma L. Rawlins
- Wellcome Trust/CRUK Gurdon Institute and Department Physiology, Development and Neuroscience, University of Cambridge, Cambridge, United Kingdom
| | - Robert E. Hynds
- Cancer Evolution and Genome Instability Laboratory, The Francis Crick Institute, London, United Kingdom
- Epithelial Cell Biology in ENT Research (EpiCENTR) Group, Developmental Biology and Cancer Department, Great Ormond Street UCL Institute of Child Health, University College London, London, United Kingdom
- CRUK Lung Cancer Centre of Excellence, UCL Cancer Institute, University College London, London, United Kingdom
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Abstract
PURPOSE OF REVIEW To provide an update on the current understanding of the role of wingless/integrase-1 (Wnt) signaling in pediatric allergic asthma and other pediatric lung diseases. RECENT FINDINGS The Wnt signaling pathway is critical for normal lung development. Genetic and epigenetic human studies indicate a link between Wnt signaling and the development and severity of asthma in children. Mechanistic studies using animal models of allergic asthma demonstrate a key role for Wnt signaling in allergic airway inflammation and remodeling. More recently, data on bronchopulmonary dysplasia (BPD) pathogenesis points to the Wnt signaling pathway as an important regulator. SUMMARY Current data indicates that the Wnt signaling pathway is an important mediator in allergic asthma and BPD pathogenesis. Further studies are needed to characterize the roles of individual Wnt signals in childhood disease, and to identify potential novel therapeutic targets to slow or prevent disease processes.
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Affiliation(s)
- Nooralam Rai
- Department of Pediatrics, Columbia University Medical Center, New York, NY, USA
| | - Jeanine D’Armiento
- Department of Anesthesiology, Medicine, and Physiology and Cellular Biophysics, Columbia University Medical Center, New York, NY, USA
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