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Palit S, Shrestha AK, Thapa S, L. Grimm S, Coarfa C, Theis F, Simon LM, Shivanna B. Leveraging Integrated RNA Sequencing to Decipher Adrenomedullin's Protective Mechanisms in Experimental Bronchopulmonary Dysplasia. Genes (Basel) 2024; 15:806. [PMID: 38927741 PMCID: PMC11202456 DOI: 10.3390/genes15060806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 06/12/2024] [Accepted: 06/15/2024] [Indexed: 06/28/2024] Open
Abstract
Bronchopulmonary dysplasia (BPD) is a chronic lung disease commonly affecting premature infants, with limited therapeutic options and increased long-term consequences. Adrenomedullin (Adm), a proangiogenic peptide hormone, has been found to protect rodents against experimental BPD. This study aims to elucidate the molecular and cellular mechanisms through which Adm influences BPD pathogenesis using a lipopolysaccharide (LPS)-induced model of experimental BPD in mice. Bulk RNA sequencing of Adm-sufficient (wild-type or Adm+/+) and Adm-haplodeficient (Adm+/-) mice lungs, integrated with single-cell RNA sequencing data, revealed distinct gene expression patterns and cell type alterations associated with Adm deficiency and LPS exposure. Notably, computational integration with cell atlas data revealed that Adm-haplodeficient mouse lungs exhibited gene expression signatures characteristic of increased inflammation, natural killer (NK) cell frequency, and decreased endothelial cell and type II pneumocyte frequency. Furthermore, in silico human BPD patient data analysis supported our cell type frequency finding, highlighting elevated NK cells in BPD infants. These results underscore the protective role of Adm in experimental BPD and emphasize that it is a potential therapeutic target for BPD infants with an inflammatory phenotype.
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Affiliation(s)
- Subarna Palit
- TUM School of Life Sciences Weihenstephan, Technical University of Munich, 85354 Freising, Germany
| | - Amrit Kumar Shrestha
- Division of Neonatology, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine, Houston, TX 77030, USA (B.S.)
| | - Shyam Thapa
- Division of Neonatology, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine, Houston, TX 77030, USA (B.S.)
| | - Sandra L. Grimm
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Cristian Coarfa
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Fabian Theis
- TUM School of Life Sciences Weihenstephan, Technical University of Munich, 85354 Freising, Germany
- Institute of Computational Biology, Helmholtz Zentrum München, 85764 Neuherberg, Germany
- Department of Mathematics, Technical University of Munich, 85748 Garching, Germany
| | - Lukas M. Simon
- Therapeutic Innovation Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Binoy Shivanna
- Division of Neonatology, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine, Houston, TX 77030, USA (B.S.)
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Shankar N, Thapa S, Shrestha AK, Sarkar P, Gaber MW, Barrios R, Shivanna B. Hyperoxia Disrupts Lung Lymphatic Homeostasis in Neonatal Mice. Antioxidants (Basel) 2023; 12:620. [PMID: 36978868 PMCID: PMC10045755 DOI: 10.3390/antiox12030620] [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: 12/27/2022] [Revised: 02/24/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023] Open
Abstract
Inflammation causes bronchopulmonary dysplasia (BPD), a common lung disease of preterm infants. One reason this disease lacks specific therapies is the paucity of information on the mechanisms regulating inflammation in developing lungs. We address this gap by characterizing the lymphatic phenotype in an experimental BPD model because lymphatics are major regulators of immune homeostasis. We hypothesized that hyperoxia (HO), a major risk factor for experimental and human BPD, disrupts lymphatic endothelial homeostasis using neonatal mice and human dermal lymphatic endothelial cells (HDLECs). Exposure to 70% O2 for 24-72 h decreased the expression of prospero homeobox 1 (Prox1) and vascular endothelial growth factor c (Vegf-c) and increased the expression of heme oxygenase 1 and NAD(P)H dehydrogenase [quinone]1 in HDLECs, and reduced their tubule formation ability. Next, we determined Prox1 and Vegf-c mRNA levels on postnatal days (P) 7 and 14 in neonatal murine lungs. The mRNA levels of these genes increased from P7 to P14, and 70% O2 exposure for 14 d (HO) attenuated this physiological increase in pro-lymphatic factors. Further, HO exposure decreased VEGFR3+ and podoplanin+ lymphatic vessel density and lymphatic function in neonatal murine lungs. Collectively, our results validate the hypothesis that HO disrupts lymphatic endothelial homeostasis.
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Affiliation(s)
- Nithyapriya Shankar
- Division of Neonatology, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine (BCM), Houston, TX 77030, USA
| | - Shyam Thapa
- Division of Neonatology, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine (BCM), Houston, TX 77030, USA
| | - Amrit Kumar Shrestha
- Division of Neonatology, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine (BCM), Houston, TX 77030, USA
| | - Poonam Sarkar
- Division of Hematology-Oncology, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine (BCM), Houston, TX 77030, USA
| | - M. Waleed Gaber
- Division of Hematology-Oncology, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine (BCM), Houston, TX 77030, USA
| | - Roberto Barrios
- Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, TX 77030, USA
| | - Binoy Shivanna
- Division of Neonatology, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine (BCM), Houston, TX 77030, USA
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Zhang L, Wang P, Shen Y, Huang T, Hu X, Yu W. Mechanism of lncRNA H19 in Regulating Pulmonary Injury in Hyperoxia-Induced Bronchopulmonary Dysplasia Newborn Mice. Am J Perinatol 2022; 39:1089-1096. [PMID: 33285606 DOI: 10.1055/s-0040-1721498] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
OBJECTIVE Bronchopulmonary dysplasia (BPD) is a pulmonary injury related to inflammation and is a major cause of premature infant death. Long noncoding RNAs (lncRNAs) are important regulators in pulmonary injury and inflammation. We investigated the molecular mechanism of lncRNA H19 in pulmonary injury and inflammation in hyperoxia (Hyp)-induced BPD mice. STUDY DESIGN The BPD newborn mouse model was established and intervened with H19 to evaluate the pathologic conditions and radial alveolar count (RAC) in lung tissues of mice in the room air (RA) and Hyp group on the 4th, 7th, and 14th days after birth. The levels of BPD-related biomarkers vascular endothelial growth factor (VEGF), transforming growth factor β1 (TGF-β1), and surfactant protein C (SPC) in lung tissues were detected on the 14th day after birth. The expression of and relationships among H19 and miR-17, miR-17, and STAT3 were detected and verified. Levels of interleukin (IL)-6, IL-1β, p-STAT3, and STAT3 levels in mouse lung tissues were detected on the 14th day after birth. RESULTS Hyp-induced mice showed increased alveolar diameter, septum, and hyperemia and inflammatory cell infiltration, upregulated H19, decreased overall number and significantly reduced RAC on the 7th and 14th days after birth, which were reversed in the si-H19-treated mice. VEGF was upregulated and TGF-β1 and SPC was decreased in si-H19-treated mice. Moreover, H19 competitively bound to miR-17 to upregulate STAT3. IL-6 and IL-1β expressions and p-STAT3 and STAT3 levels were downregulated after inhibition of H19. CONCLUSION Downregulated lncRNA H19 relieved pulmonary injury via targeting miR-17 to downregulate STAT3 and reduced inflammatory response caused by p-STAT3 in BPD newborn mice. KEY POINTS · lncRNA H19 was highly expressed in Hyp-induced BPD newborn mice.. · si-H19 relieved pulmonary injury in Hyp-induced BPD newborn mice.. · si-H19 upregulated miR-17 and downregulated STAT3 expression..
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Affiliation(s)
- Lina Zhang
- Department of Pediatrics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, People's Republic of China
| | - Ping Wang
- Department of Hand and Foot Surgery, Nanchang Fifth Hospital, Nanchang, Jiangxi, People's Republic of China
| | - Yanhong Shen
- Department of Pediatrics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, People's Republic of China
| | - Tao Huang
- Department of Pediatrics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, People's Republic of China
| | - Xiaoyun Hu
- Department of Pediatrics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, People's Republic of China
| | - Wei Yu
- Department of Pediatrics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, People's Republic of China
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Toth A, Steinmeyer S, Kannan P, Gray J, Jackson CM, Mukherjee S, Demmert M, Sheak JR, Benson D, Kitzmiller J, Wayman JA, Presicce P, Cates C, Rubin R, Chetal K, Du Y, Miao Y, Gu M, Guo M, Kalinichenko VV, Kallapur SG, Miraldi ER, Xu Y, Swarr D, Lewkowich I, Salomonis N, Miller L, Sucre JS, Whitsett JA, Chougnet CA, Jobe AH, Deshmukh H, Zacharias WJ. Inflammatory blockade prevents injury to the developing pulmonary gas exchange surface in preterm primates. Sci Transl Med 2022; 14:eabl8574. [PMID: 35353543 PMCID: PMC9082785 DOI: 10.1126/scitranslmed.abl8574] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Perinatal inflammatory stress is associated with early life morbidity and lifelong consequences for pulmonary health. Chorioamnionitis, an inflammatory condition affecting the placenta and fluid surrounding the developing fetus, affects 25 to 40% of preterm births. Severe chorioamnionitis with preterm birth is associated with significantly increased risk of pulmonary disease and secondary infections in childhood, suggesting that fetal inflammation may markedly alter the development of the lung. Here, we used intra-amniotic lipopolysaccharide (LPS) challenge to induce experimental chorioamnionitis in a prenatal rhesus macaque (Macaca mulatta) model that mirrors structural and temporal aspects of human lung development. Inflammatory injury directly disrupted the developing gas exchange surface of the primate lung, with extensive damage to alveolar structure, particularly the close association and coordinated differentiation of alveolar type 1 pneumocytes and specialized alveolar capillary endothelium. Single-cell RNA sequencing analysis defined a multicellular alveolar signaling niche driving alveologenesis that was extensively disrupted by perinatal inflammation, leading to a loss of gas exchange surface and alveolar simplification, with notable resemblance to chronic lung disease in newborns. Blockade of the inflammatory cytokines interleukin-1β and tumor necrosis factor-α ameliorated LPS-induced inflammatory lung injury by blunting stromal responses to inflammation and modulating innate immune activation in myeloid cells, restoring structural integrity and key signaling networks in the developing alveolus. These data provide new insight into the pathophysiology of developmental lung injury and suggest that modulating inflammation is a promising therapeutic approach to prevent fetal consequences of chorioamnionitis.
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Affiliation(s)
- Andrea Toth
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Medical Scientist Training Program, University of Cincinnati College of Medicine, Cincinnati, OH USA
- Molecular and Developmental Biology Graduate Program, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Shelby Steinmeyer
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Paranthaman Kannan
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Jerilyn Gray
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Courtney M. Jackson
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Immunology Graduate Program, University of Cincinnati College of Medicine, Cincinnati, OH USA
- Department of Pediatrics, Division of Allergy and Immunology, University of Rochester, Rochester, NY USA
| | - Shibabrata Mukherjee
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Martin Demmert
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, Institute for Systemic Inflammation Research, University of Lϋbeck, Lϋbeck, Germany
| | - Joshua R. Sheak
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Daniel Benson
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Joseph Kitzmiller
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Joseph A. Wayman
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Pietro Presicce
- Divisions of Neonatology and Developmental Biology, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA USA
| | - Christopher Cates
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Rhea Rubin
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Kashish Chetal
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Yina Du
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
| | - Yifei Miao
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Mingxia Gu
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Minzhe Guo
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Vladimir V. Kalinichenko
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Suhas G. Kallapur
- Divisions of Neonatology and Developmental Biology, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA USA
| | - Emily R. Miraldi
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Yan Xu
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Daniel Swarr
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Ian Lewkowich
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Nathan Salomonis
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Lisa Miller
- California National Primate Research Center, University of California Davis, Davis, CA USA
- Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California Davis, Davis, CA USA
| | - Jennifer S. Sucre
- Division of Neonatology, Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN USA
| | - Jeffrey A. Whitsett
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Claire A. Chougnet
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Alan H. Jobe
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - Hitesh Deshmukh
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
| | - William J. Zacharias
- Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH USA
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, OH USA
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Protective effect of adrenomedullin on hyperoxia-induced lung injury. ZHONGGUO DANG DAI ER KE ZA ZHI = CHINESE JOURNAL OF CONTEMPORARY PEDIATRICS 2021; 23:1282-1288. [PMID: 34911614 PMCID: PMC8690717 DOI: 10.7499/j.issn.1008-8830.2109005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVES To study the role of adrenomedullin (ADM) in hyperoxia-induced lung injury by examining the effect of ADM on the expression of calcitonin receptor-like receptor (CRLR), receptor activity-modifying protein 2 (RAMP2), extracellular signal-regulated kinase (ERK), and protein kinase B (PKB) in human pulmonary microvascular endothelial cells (HPMECs) under different experimental conditions. METHODS HPMECs were randomly divided into an air group and a hyperoxia group (n=3 each).The HPMECs in the hyperoxia group were cultured in an atmosphere of 92% O2 (3 L/minute) +5% CO2. RT-qPCR and Western blot were used to measure the mRNA and protein expression levels of ADM, CRLR, RAMP2, ERK1/2, and PKB. Other HPMECs were divided into a non-interference group and an interference group (n=3 each), and the mRNA and protein expression levels of ADM, ERK1/2, and PKB were measured after the HPMECs in the interference group were transfected with ADM siRNA. RESULTS Compared with the air group, the hyperoxia group had significant increases in the mRNA and protein expression levels of ADM, CRLR, RAMP2, ERK1/2, and PKB (P<0.05). Compared with the non-interference group, the interference group had significant reductions in the mRNA and protein expression levels of ADM, ERK1/2, and PKB (P<0.05). CONCLUSIONS ERK1/2 and PKB may be the downstream targets of the ADM signaling pathway. ADM mediates the ERK/PKB signaling pathway by regulating CRLR/RAMP2 and participates in the protection of hyperoxia-induced lung injury.
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Endothelial Adenosine Monophosphate-Activated Protein Kinase-Alpha1 Deficiency Potentiates Hyperoxia-Induced Experimental Bronchopulmonary Dysplasia and Pulmonary Hypertension. Antioxidants (Basel) 2021; 10:antiox10121913. [PMID: 34943016 PMCID: PMC8750184 DOI: 10.3390/antiox10121913] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/21/2021] [Accepted: 11/25/2021] [Indexed: 11/17/2022] Open
Abstract
Bronchopulmonary dysplasia and pulmonary hypertension, or BPD-PH, are serious chronic lung disorders of prematurity, without curative therapies. Hyperoxia, a known causative factor of BPD-PH, activates adenosine monophosphate-activated protein kinase (AMPK) α1 in neonatal murine lungs; however, whether this phenomenon potentiates or mitigates lung injury is unclear. Thus, we hypothesized that (1) endothelial AMPKα1 is necessary to protect neonatal mice against hyperoxia-induced BPD-PH, and (2) AMPKα1 knockdown decreases angiogenesis in hyperoxia-exposed neonatal human pulmonary microvascular endothelial cells (HPMECs). We performed lung morphometric and echocardiographic studies on postnatal day (P) 28 on endothelial AMPKα1-sufficient and -deficient mice exposed to 21% O2 (normoxia) or 70% O2 (hyperoxia) from P1–P14. We also performed tubule formation assays on control- or AMPKα1-siRNA transfected HPMECs, exposed to 21% O2 or 70% O2 for 48 h. Hyperoxia-mediated alveolar and pulmonary vascular simplification, pulmonary vascular remodeling, and PH were significantly amplified in endothelial AMPKα1-deficient mice. AMPKα1 siRNA knocked down AMPKα1 expression in HPMECs, and decreased their ability to form tubules in normoxia and hyperoxia. Furthermore, AMPKα1 knockdown decreased proliferating cell nuclear antigen expression in hyperoxic conditions. Our results indicate that AMPKα1 is required to reduce hyperoxia-induced BPD-PH burden in neonatal mice, and promotes angiogenesis in HPMECs to limit lung injury.
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Ozdemir R, Gokce IK, Taslidere AC, Tanbek K, Gul CC, Sandal S, Turgut H, Kaya H, Aslan M. Does Chrysin prevent severe lung damage in Hyperoxia-Induced lung injury Model? Int Immunopharmacol 2021; 99:108033. [PMID: 34343938 DOI: 10.1016/j.intimp.2021.108033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 07/27/2021] [Accepted: 07/27/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND Oxidative stress and inflammation play a critical role in the etiopathogenesis of bronchopulmonary dysplasia (BPD). The aim of this study was to evaluate the preventive effect of Chrysin (CH), an antioxidant, antiinflammatory, antiapoptotic and antifibrotic drug, on hyperoxia-induced lung injury in a neonatal rat model. METHODS Forty infant rats were divided into four groups labeled the Control, CH, BPD, and BPD + CH. The control and CH groups were kept in a normal room environment, while the BPD and BPD + CH groups were kept in a hyperoxic (90-95%) environment. At the end of the study, lung tissue was evaluated with respect to apoptosis, histopathological damage and alveolar macrophage score as well as oxidant capacity, antioxidant capacity, and inflammation. RESULTS Compared to the BPD + CH and control groups, the lung tissues of the BPD group displayed substantially higher levels of MDA, TOS, TNF-α, and IL-1β (p < 0.05). While the BPD + CH group showed similar levels of TNF-α and IL-1β as the control group, MDA and TOS levels were higher than the control group, and significantly lower than the BPD group (p < 0.05). The BPD group exhibited considerably lower levels of TAS, SOD, GSH, and GSH-Px in comparison to the control group (p < 0.05). The BPD and BPD + CH groups exhibited higher mean scores of histopathological damage and alveolar macrophage when compared to the control and CH groups (p ≤ 0.0001). Both scores were found to be lower in the BPD + CH group in comparison to the BPD group (p ≤ 0.0001). The BPD + CH group demonstrated a significantly lower average of TUNEL and caspase-3 positive cells than the BPD group. CONCLUSION We found that prophylaxis with CH results in lower histopathological damage score and reduces apoptotic cell count, inflammation and oxidative stress while increasing anti-oxidant capacity.
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Affiliation(s)
- Ramazan Ozdemir
- Division of Neonatology, Department of Pediatrics, Inonu University School of Medicine, Malatya, Turkey.
| | - Ismail Kursat Gokce
- Division of Neonatology, Department of Pediatrics, Inonu University School of Medicine, Malatya, Turkey
| | - Asli Cetin Taslidere
- Department of Histology and Embryology, Inonu University School of Medicine, Malatya, Turkey
| | - Kevser Tanbek
- Department of Physiology, Inonu University School of Medicine, Malatya, Turkey
| | - Cemile Ceren Gul
- Department of Histology and Embryology, Inonu University School of Medicine, Malatya, Turkey
| | - Suleyman Sandal
- Department of Physiology, Inonu University School of Medicine, Malatya, Turkey
| | - Hatice Turgut
- Division of Neonatology, Department of Pediatrics, Inonu University School of Medicine, Malatya, Turkey
| | - Huseyin Kaya
- Division of Neonatology, Department of Pediatrics, Inonu University School of Medicine, Malatya, Turkey
| | - Mehmet Aslan
- Department of Pediatrics, Inonu University School of Medicine, Malatya, Turkey
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Giusto K, Wanczyk H, Jensen T, Finck C. Hyperoxia-induced bronchopulmonary dysplasia: better models for better therapies. Dis Model Mech 2021; 14:dmm047753. [PMID: 33729989 PMCID: PMC7927658 DOI: 10.1242/dmm.047753] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Bronchopulmonary dysplasia (BPD) is a chronic lung disease caused by exposure to high levels of oxygen (hyperoxia) and is the most common complication that affects preterm newborns. At present, there is no cure for BPD. Infants can recover from BPD; however, they will suffer from significant morbidity into adulthood in the form of neurodevelopmental impairment, asthma and emphysematous changes of the lung. The development of hyperoxia-induced lung injury models in small and large animals to test potential treatments for BPD has shown some success, yet a lack of standardization in approaches and methods makes clinical translation difficult. In vitro models have also been developed to investigate the molecular pathways altered during BPD and to address the pitfalls associated with animal models. Preclinical studies have investigated the efficacy of stem cell-based therapies to improve lung morphology after damage. However, variability regarding the type of animal model and duration of hyperoxia to elicit damage exists in the literature. These models should be further developed and standardized, to cover the degree and duration of hyperoxia, type of animal model, and lung injury endpoint, to improve their translational relevance. The purpose of this Review is to highlight concerns associated with current animal models of hyperoxia-induced BPD and to show the potential of in vitro models to complement in vivo studies in the significant improvement to our understanding of BPD pathogenesis and treatment. The status of current stem cell therapies for treatment of BPD is also discussed. We offer suggestions to optimize models and therapeutic modalities for treatment of hyperoxia-induced lung damage in order to advance the standardization of procedures for clinical translation.
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Affiliation(s)
- Kiersten Giusto
- Department of Pediatrics, University of Connecticut Health Center, Farmington, 06106 CT, USA
| | - Heather Wanczyk
- Department of Pediatrics, University of Connecticut Health Center, Farmington, 06106 CT, USA
| | - Todd Jensen
- Department of Pediatrics, University of Connecticut Health Center, Farmington, 06106 CT, USA
| | - Christine Finck
- Department of Pediatrics, University of Connecticut Health Center, Farmington, 06106 CT, USA
- Department of Surgery, Connecticut Children's Medical Center, Hartford, CT, USA
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Menon RT, Shrestha AK, Reynolds CL, Barrios R, Caron KM, Shivanna B. Adrenomedullin Is Necessary to Resolve Hyperoxia-Induced Experimental Bronchopulmonary Dysplasia and Pulmonary Hypertension in Mice. THE AMERICAN JOURNAL OF PATHOLOGY 2020; 190:711-722. [PMID: 32093901 DOI: 10.1016/j.ajpath.2019.11.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 10/29/2019] [Accepted: 11/25/2019] [Indexed: 12/14/2022]
Abstract
Bronchopulmonary dysplasia (BPD)-associated pulmonary hypertension (PH) is an infantile lung disease characterized by aberrant angiogenesis and impaired resolution of lung injury. Adrenomedullin (AM) signals through calcitonin receptor-like receptor and receptor activity-modifying protein 2 and modulates lung injury initiation. However, its role in lung injury resolution and the mechanisms by which it regulates angiogenesis remain unclear. Consequently, we hypothesized that AM resolves hyperoxia-induced BPD and PH via endothelial nitric oxide synthase (NOS3). AM-sufficient (ADM+/+) or -deficient (ADM+/-) mice were exposed to normoxia or hyperoxia through postnatal days (PNDs) 1 to 14, and the hyperoxia-exposed mice were allowed to recover in normoxia for an additional 56 days. Lung injury and development and PH were quantified at different time points. Human pulmonary microvascular endothelial cells were also used to examine the effects of AM signaling on the NOS3 pathway and angiogenesis. Lung blood vessels and NOS3 expression decreased and the extent of hyperoxia-induced BPD and PH increased in ADM+/- mice compared with ADM+/+ mice. Hyperoxia-induced apoptosis and PH resolved by PND14 and PND70, respectively, in ADM+/+ mice but not in ADM+/- mice. Knockdown of ADM, calcitonin receptor-like receptor, and receptor activity-modifying protein 2 in vitro decreased NOS3 expression, nitric oxide generation, and angiogenesis. Furthermore, NOS3 knockdown abrogated the angiogenic effects of AM. Collectively, these results indicate that AM resolves hyperoxic lung injury via NOS3.
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Affiliation(s)
- Renuka T Menon
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas
| | - Amrit Kumar Shrestha
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas
| | - Corey L Reynolds
- Mouse Phenotyping Core, Baylor College of Medicine, Houston, Texas
| | - Roberto Barrios
- Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, Texas
| | - Kathleen M Caron
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, North Carolina
| | - Binoy Shivanna
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas.
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10
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Lignelli E, Palumbo F, Myti D, Morty RE. Recent advances in our understanding of the mechanisms of lung alveolarization and bronchopulmonary dysplasia. Am J Physiol Lung Cell Mol Physiol 2019; 317:L832-L887. [PMID: 31596603 DOI: 10.1152/ajplung.00369.2019] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Bronchopulmonary dysplasia (BPD) is the most common cause of morbidity and mortality in preterm infants. A key histopathological feature of BPD is stunted late lung development, where the process of alveolarization-the generation of alveolar gas exchange units-is impeded, through mechanisms that remain largely unclear. As such, there is interest in the clarification both of the pathomechanisms at play in affected lungs, and the mechanisms of de novo alveoli generation in healthy, developing lungs. A better understanding of normal and pathological alveolarization might reveal opportunities for improved medical management of affected infants. Furthermore, disturbances to the alveolar architecture are a key histopathological feature of several adult chronic lung diseases, including emphysema and fibrosis, and it is envisaged that knowledge about the mechanisms of alveologenesis might facilitate regeneration of healthy lung parenchyma in affected patients. To this end, recent efforts have interrogated clinical data, developed new-and refined existing-in vivo and in vitro models of BPD, have applied new microscopic and radiographic approaches, and have developed advanced cell-culture approaches, including organoid generation. Advances have also been made in the development of other methodologies, including single-cell analysis, metabolomics, lipidomics, and proteomics, as well as the generation and use of complex mouse genetics tools. The objective of this review is to present advances made in our understanding of the mechanisms of lung alveolarization and BPD over the period 1 January 2017-30 June 2019, a period that spans the 50th anniversary of the original clinical description of BPD in preterm infants.
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Affiliation(s)
- Ettore Lignelli
- Department of Lung Development and Remodeling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center, member of the German Center for Lung Research, Giessen, Germany
| | - Francesco Palumbo
- Department of Lung Development and Remodeling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center, member of the German Center for Lung Research, Giessen, Germany
| | - Despoina Myti
- Department of Lung Development and Remodeling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center, member of the German Center for Lung Research, Giessen, Germany
| | - Rory E Morty
- Department of Lung Development and Remodeling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center, member of the German Center for Lung Research, Giessen, Germany
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11
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Zhang T, Li X, Li Y, Wang H. Inhibition of TGF-β-Smad signaling attenuates hyperoxia-induced brain damage in newborn rats. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2019; 12:3772-3781. [PMID: 31933765 PMCID: PMC6949745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Accepted: 08/29/2019] [Indexed: 06/10/2023]
Abstract
Transforming growth factor-beta (TGF-β) is ubiquitously expressed in various tissues and functions in pathologic processes, including hyperoxia. In the present study, we investigated the expression and functional role of TGF-β in brain tissue during hyperoxia-induced brain damage. Three days old neonatal rats were treated with hyperoxic conditions (80% O2) for 7 days, followed by TGF-β, Smad, and MAPK detection by western blotting and immunohistochemical staining. The functional role of TGF-β was assessed by treating hyperoxic neonatal rats with neutralizing antibody against TGF-β and caffeine, followed by histological and myelin basic protein (MBP) staining. Our results demonstrated upregulation of TGF-β and activation of the Smad/MAPK signaling pathway in brain tissue of neonatal rats under hyperoxic conditions. Injection of neutralizing antibody against TGF-β efficiently blocked TGF-β expression, accompanied by inactivation of the Smad/MAPK signaling pathway. Further evidence confirmed the attenuation of hyperoxia-induced brain damage by a neutralizing antibody against TGF-β in neonatal rats. Similar attenuation was also observed for caffeine. Collectively, our results indicate that TGF-β is a therapy target for hyperoxia-induced brain damage in neonates.
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Affiliation(s)
- Ting Zhang
- Department of Pediatrics, West China Second University Hospital, Sichuan UniversityChengdu, P. R. China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan UniversityChengdu, P. R. China
| | - Xiaowen Li
- Department of Pediatrics, West China Second University Hospital, Sichuan UniversityChengdu, P. R. China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan UniversityChengdu, P. R. China
| | - Yu Li
- Department of Ophthalmology, Fourth Affiliated Hospital of Sichuan University, Sichuan UniversityChengdu 610041, Sichuan, P. R. China
| | - Hua Wang
- Department of Pediatrics, West China Second University Hospital, Sichuan UniversityChengdu, P. R. China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan UniversityChengdu, P. R. China
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12
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Proximal Tubular Development Is Impaired with Downregulation of MAPK/ERK Signaling, HIF-1 α, and Catalase by Hyperoxia Exposure in Neonatal Rats. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:9219847. [PMID: 31558952 PMCID: PMC6735195 DOI: 10.1155/2019/9219847] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 06/04/2019] [Indexed: 12/22/2022]
Abstract
Supplemental oxygen therapy (hyperoxia) is a widely used treatment for alveolar hypoxia in preterm infants. Despite being closely monitored, hyperoxia exposure is believed to undermine neonatal nephrogenesis and renal function caused by elevated oxidative stress. Previous studies have mostly focused on the hyperoxia-induced impairment of glomerular development, while the long-term impact of neonatal hyperoxia on tubular development and the regulatory component involved in this process remain to be clarified. Here, we examined tubular histology and apoptosis, along with the expression profile of mitogen-activated protein kinase (MAPK)/extracellular signal-regulated kinase (ERK) signaling, hypoxia-inducible factor 1α (HIF-1α), and catalase, following hyperoxia exposure in neonatal rats. Hematoxylin and eosin (H&E) staining revealed the early disappearance of the nephrogenic zone, as well as dilated lumens and reduced epithelial cells, of mature proximal tubules following neonatal hyperoxia. A robust increase in tubular cell apoptosis caused by neonatal hyperoxia was found using a TUNEL assay. Moreover, neonatal hyperoxia altered renal MAPK/ERK signaling activity and downregulated the expression of HIF-1α and catalase in the proximal tubules throughout nephrogenesis from S-shaped bodies to mature proximal tubules. Cell apoptosis in the proximal tubules was positively correlated with HIF-1α expression on the 14th postnatal day. Our data indicates that proximal tubular development is impaired by neonatal hyperoxia, which is accompanied by altered MAPK/ERK signaling as well as downregulated HIF-1α and catalase. Therapeutic management that targets MAPK/ERK signaling, HIF-1α, or catalase may serve as a protective agent against hyperoxia-induced oxidative damage to neonatal proximal tubules.
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13
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Shrestha AK, Gopal VYN, Menon RT, Hagan JL, Huang S, Shivanna B. Lung omics signatures in a bronchopulmonary dysplasia and pulmonary hypertension-like murine model. Am J Physiol Lung Cell Mol Physiol 2018; 315:L734-L741. [PMID: 30047283 DOI: 10.1152/ajplung.00183.2018] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Bronchopulmonary dysplasia (BPD), the most common chronic lung disease in infants, is associated with long-term morbidities, including pulmonary hypertension (PH). Importantly, hyperoxia causes BPD and PH; however, the underlying mechanisms remain unclear. Herein, we performed high-throughput transcriptomic and proteomic studies using a clinically relevant murine model of BPD with PH. Neonatal wild-type C57BL6J mice were exposed to 21% oxygen (normoxia) or 70% oxygen (hyperoxia) during postnatal days (PNDs) 1-7. Lung tissues were collected for proteomic and genomic analyses on PND 7, and selected genes and proteins were validated by real-time quantitative PCR and immunoblotting analysis, respectively. Hyperoxia exposure dysregulated the expression of 344 genes and 21 proteins. Interestingly, hyperoxia downregulated genes involved in neuronal development and maturation in lung tissues. Gene set enrichment and gene ontology analyses identified apoptosis, oxidoreductase activity, plasma membrane integrity, organ development, angiogenesis, cell proliferation, and mitophagy as the predominant processes affected by hyperoxia. Furthermore, selected deregulated proteins strongly correlated with the expression of specific genes. Collectively, our results identified several potential therapeutic targets for hyperoxia-mediated BPD and PH in infants.
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Affiliation(s)
- Amrit Kumar Shrestha
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine , Houston, Texas
| | - Vashisht Y N Gopal
- Department of Melanoma Medical Oncology and Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center , Houston, Texas
| | - Renuka T Menon
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine , Houston, Texas
| | - Joseph L Hagan
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine , Houston, Texas
| | - Shixia Huang
- Dan L. Duncan Cancer Center, Department of Molecular and Cellular Biology, Baylor College of Medicine , Houston, Texas
| | - Binoy Shivanna
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine , Houston, Texas
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14
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Hyperoxia Disrupts Extracellular Signal-Regulated Kinases 1/2-Induced Angiogenesis in the Developing Lungs. Int J Mol Sci 2018; 19:ijms19051525. [PMID: 29783779 PMCID: PMC5983575 DOI: 10.3390/ijms19051525] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 05/16/2018] [Accepted: 05/18/2018] [Indexed: 11/17/2022] Open
Abstract
Hyperoxia contributes to the pathogenesis of bronchopulmonary dysplasia (BPD), a chronic lung disease of infants that is characterized by interrupted alveologenesis. Disrupted angiogenesis inhibits alveologenesis, but the mechanisms of disrupted angiogenesis in the developing lungs are poorly understood. In pre-clinical BPD models, hyperoxia increases the expression of extracellular signal-regulated kinases (ERK) 1/2; however, its effects on the lung endothelial ERK1/2 signaling are unclear. Further, whether ERK1/2 activation promotes lung angiogenesis in infants is unknown. Hence, we tested the following hypotheses: (1) hyperoxia exposure will increase lung endothelial ERK1/2 signaling in neonatal C57BL/6J (WT) mice and in fetal human pulmonary artery endothelial cells (HPAECs); (2) ERK1/2 inhibition will disrupt angiogenesis in vitro by repressing cell cycle progression. In mice, hyperoxia exposure transiently increased lung endothelial ERK1/2 activation at one week of life, before inhibiting it at two weeks of life. Interestingly, hyperoxia-mediated decrease in ERK1/2 activation in mice was associated with decreased angiogenesis and increased endothelial cell apoptosis. Hyperoxia also transiently activated ERK1/2 in HPAECs. ERK1/2 inhibition disrupted angiogenesis in vitro, and these effects were associated with altered levels of proteins that modulate cell cycle progression. Collectively, these findings support our hypotheses, emphasizing that the ERK1/2 pathway is a potential therapeutic target for BPD infants with decreased lung vascularization.
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15
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Menon RT, Shrestha AK, Reynolds CL, Barrios R, Shivanna B. Long-term pulmonary and cardiovascular morbidities of neonatal hyperoxia exposure in mice. Int J Biochem Cell Biol 2018; 94:119-124. [PMID: 29223466 PMCID: PMC5745292 DOI: 10.1016/j.biocel.2017.12.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 11/14/2017] [Accepted: 12/01/2017] [Indexed: 12/14/2022]
Abstract
Pulmonary hypertension (PH) frequently occurs in infants with bronchopulmonary dysplasia (BPD), causing increased mortality and right ventricular (RV) dysfunction that persists into adulthood. A first step in developing better therapeutic options is identifying and characterizing an appropriate animal model. Previously, we characterized the short-term morbidities of a model in which C57BL/6J wild-type (WT) mice were exposed to 70% O2 (hyperoxia) during the neonatal period. Here, we aimed to determine the long-term morbidities using lung morphometry, echocardiography (Echo), and cardiac magnetic resonance imaging (cMRI). The major highlight of this study is the use of the state-of-the art imaging technique, cMRI, in mice to characterize the long-term cardiac effects of neonatal hyperoxia exposure. To this end, WT mice were exposed to 21% O2 (normoxia) or hyperoxia for two weeks of life, followed by recovery in normoxia for six weeks. Alveolarization, pulmonary vascularization, pulmonary hypertension, and RV function were quantified at eight weeks. We found that hyperoxia exposure resulted in persistent alveolar and pulmonary vascular simplification. Furthermore, the Echo and cMRI studies demonstrated that hyperoxia-exposed mice had signs of PH and RV dysfunction as indicated by increased RV pressure, mass, and end-systolic and -diastolic volumes, and decreased RV stroke volume and ejection fractions. Taken together, our results demonstrate that neonatal hyperoxia exposure in mice cause cardiopulmonary morbidities that persists into adulthood and provides evidence for the use of this model to develop novel therapies for BPD infants with PH.
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MESH Headings
- Animals
- Animals, Newborn
- Atmosphere Exposure Chambers
- Bronchopulmonary Dysplasia/physiopathology
- Disease Models, Animal
- Echocardiography
- Feasibility Studies
- Female
- Heart/diagnostic imaging
- Heart/physiopathology
- Hyperoxia/physiopathology
- Hypertension, Pulmonary/diagnostic imaging
- Hypertension, Pulmonary/etiology
- Hypertension, Pulmonary/pathology
- Lung/blood supply
- Lung/diagnostic imaging
- Lung/pathology
- Magnetic Resonance Imaging
- Male
- Mice, Inbred C57BL
- Myocardium/pathology
- Organ Size
- Pulmonary Circulation
- Stroke Volume
- Time Factors
- Ultrasonography, Doppler, Pulsed
- Ventricular Dysfunction, Right/diagnostic imaging
- Ventricular Dysfunction, Right/etiology
- Ventricular Dysfunction, Right/pathology
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Affiliation(s)
- Renuka T Menon
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Amrit Kumar Shrestha
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Corey L Reynolds
- Mouse Phenotyping Core, Baylor College of Medicine, Houston, TX, USA
| | - Roberto Barrios
- Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, TX, USA
| | - Binoy Shivanna
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.
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16
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Surate Solaligue DE, Rodríguez-Castillo JA, Ahlbrecht K, Morty RE. Recent advances in our understanding of the mechanisms of late lung development and bronchopulmonary dysplasia. Am J Physiol Lung Cell Mol Physiol 2017; 313:L1101-L1153. [PMID: 28971976 DOI: 10.1152/ajplung.00343.2017] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 09/21/2017] [Accepted: 09/23/2017] [Indexed: 02/08/2023] Open
Abstract
The objective of lung development is to generate an organ of gas exchange that provides both a thin gas diffusion barrier and a large gas diffusion surface area, which concomitantly generates a steep gas diffusion concentration gradient. As such, the lung is perfectly structured to undertake the function of gas exchange: a large number of small alveoli provide extensive surface area within the limited volume of the lung, and a delicate alveolo-capillary barrier brings circulating blood into close proximity to the inspired air. Efficient movement of inspired air and circulating blood through the conducting airways and conducting vessels, respectively, generates steep oxygen and carbon dioxide concentration gradients across the alveolo-capillary barrier, providing ideal conditions for effective diffusion of both gases during breathing. The development of the gas exchange apparatus of the lung occurs during the second phase of lung development-namely, late lung development-which includes the canalicular, saccular, and alveolar stages of lung development. It is during these stages of lung development that preterm-born infants are delivered, when the lung is not yet competent for effective gas exchange. These infants may develop bronchopulmonary dysplasia (BPD), a syndrome complicated by disturbances to the development of the alveoli and the pulmonary vasculature. It is the objective of this review to update the reader about recent developments that further our understanding of the mechanisms of lung alveolarization and vascularization and the pathogenesis of BPD and other neonatal lung diseases that feature lung hypoplasia.
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Affiliation(s)
- David E Surate Solaligue
- Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; and.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center, German Center for Lung Research, Giessen, Germany
| | - José Alberto Rodríguez-Castillo
- Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; and.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center, German Center for Lung Research, Giessen, Germany
| | - Katrin Ahlbrecht
- Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; and.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center, German Center for Lung Research, Giessen, Germany
| | - Rory E Morty
- Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; and .,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center, German Center for Lung Research, Giessen, Germany
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