1
|
Roberts JD. LungElast-an open-source, flexible, low-cost, microprocessor-controlled mouse lung elastometer. Sci Rep 2023; 13:11246. [PMID: 37438462 PMCID: PMC10338507 DOI: 10.1038/s41598-023-38310-7] [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: 01/05/2023] [Accepted: 07/06/2023] [Indexed: 07/14/2023] Open
Abstract
The study of mouse lung mechanics provides essential insights into the physiological mechanisms of pulmonary disease. Consequently, investigators assemble custom systems comprising infusion-withdrawal syringe pumps and analog pressure sensors to investigate the lung function of these animals. But these systems are expensive and require ongoing regulation, making them challenging to use. Here I introduce LungElast, an open-source, inexpensive, and self-contained instrument that can experimentally determine lung elasticity and volumes even in immature mice. It is assembled using custom 3D printed parts and readily available or easily constructed components. In this device, a microprocessor-controlled stepper motor automatically regulates lung volume by precisely driving a syringe piston whose position is determined using time-of-flight LIDAR technology. The airway pressures associated with the lung volumes are determined using compact sensor-on-chip technology, retrieved in a digital format, and stored by the microcontroller. The instrument software is modular, which eases device testing, calibration, and use. Data are also provided here that specify the accuracy and precision of the elastometer's sensors and volume delivery and demonstrate its use with lung models and mouse pups. This instrument has excellent potential for research and educational work.
Collapse
Affiliation(s)
- Jesse D Roberts
- Cardiovascular Research Center of the General Medical Services and the Departments of Anesthesia, Critical Care and Pain Medicine, Pediatrics, and Medicine, Massachusetts General Hospital - East, 149 13th St, Boston, MA, USA.
- Harvard Medical School, Harvard University, Cambridge, MA, USA.
| |
Collapse
|
2
|
Kandasamy J, Li R, Vamesu BM, Olave N, Halloran B, Jilling T, Ballinger SW, Ambalavanan N. Mitochondrial DNA Variations Modulate Alveolar Epithelial Mitochondrial Function and Oxidative Stress in Newborn Mice Exposed to Hyperoxia. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.17.541177. [PMID: 37292719 PMCID: PMC10245974 DOI: 10.1101/2023.05.17.541177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Oxidative stress is an important contributor to bronchopulmonary dysplasia (BPD), a form of chronic lung disease that is the most common morbidity in very preterm infants. Mitochondrial functional differences due to inherited and acquired mutations influence the pathogenesis of disorders in which oxidative stress plays a critical role. We previously showed using mitochondrial-nuclear exchange (MNX) mice that mitochondrial DNA (mtDNA) variations modulate hyperoxia-induced lung injury severity in a model of BPD. In this study, we studied the effects of mtDNA variations on mitochondrial function including mitophagy in alveolar epithelial cells (AT2) from MNX mice. We also investigated oxidant and inflammatory stress as well as transcriptomic profiles in lung tissue in mice and expression of proteins such as PINK1, Parkin and SIRT3 in infants with BPD. Our results indicate that AT2 from mice with C57 mtDNA had decreased mitochondrial bioenergetic function and inner membrane potential, increased mitochondrial membrane permeability and were exposed to higher levels of oxidant stress during hyperoxia compared to AT2 from mice with C3H mtDNA. Lungs from hyperoxia-exposed mice with C57 mtDNA also had higher levels of pro-inflammatory cytokines compared to lungs from mice with C3H mtDNA. We also noted changes in KEGG pathways related to inflammation, PPAR and glutamatergic signaling, and mitophagy in mice with certain mito-nuclear combinations but not others. Mitophagy was decreased by hyperoxia in all mice strains, but to a greater degree in AT2 and neonatal mice lung fibroblasts from hyperoxia-exposed mice with C57 mtDNA compared to C3H mtDNA. Finally, mtDNA haplogroups vary with ethnicity, and Black infants with BPD had lower levels of PINK1, Parkin and SIRT3 expression in HUVEC at birth and tracheal aspirates at 28 days of life when compared to White infants with BPD. These results indicate that predisposition to neonatal lung injury may be modulated by variations in mtDNA and mito-nuclear interactions need to be investigated to discover novel pathogenic mechanisms for BPD.
Collapse
|
3
|
Yee AJ, Kandasamy J, Ambalavanan N, Ren C, Halloran B, Olave N, Nicola T, Jilling T. Platelet Activating Factor Activity Modulates Hyperoxic Neonatal Lung Injury Severity. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.14.532697. [PMID: 36993203 PMCID: PMC10055044 DOI: 10.1101/2023.03.14.532697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Hyperoxia-induced inflammation contributes significantly to developmental lung injury and bronchopulmonary dysplasia (BPD) in preterm infants. Platelet activating factor (PAF) is known to be a major driver of inflammation in lung diseases such as asthma and pulmonary fibrosis, but its role in BPD has not been previously investigated. Therefore, to determine whether PAF signaling independently modulates neonatal hyperoxic lung injury and BPD pathogenesis, lung structure was assessed in 14 day-old C57BL/6 wild-type (WT) and PAF receptor knockout (PTAFR KO) mice that were exposed to 21% (normoxia) or 85% O 2 (hyperoxia) from postnatal day 4. Lung morphometry showed that PTAFR KO mice had attenuated hyperoxia-induced alveolar simplification when compared to WT mice. Functional analysis of gene expression data from hyperoxia-exposed vs. normoxia-exposed lungs of WT and PTAFR KO showed that the most upregulated pathways were the hypercytokinemia/hyperchemokinemia pathway in WT mice, NAD signaling pathway in PTAFR KO mice, and agranulocyte adhesion and diapedesis as well as other pro-fibrotic pathways such as tumor microenvironment and oncostatin-M signaling in both mice strains, indicating that PAF signaling may contribute to inflammation but may not be a significant mediator of fibrotic processes during hyperoxic neonatal lung injury. Gene expression analysis also indicated increased expression of pro-inflammatory genes such as CXCL1, CCL2 and IL-6 in the lungs of hyperoxia-exposed WT mice and metabolic regulators such as HMGCS2 and SIRT3 in the lungs of PTAFR KO mice, suggesting that PAF signaling may modulate BPD risk through changes in pulmonary inflammation and/or metabolic reprogramming in preterm infants.
Collapse
|
4
|
Freeman AE, Willis KA, Qiao L, Abdelgawad AS, Halloran B, Rezonzew G, Nizami Z, Wenger N, Gaggar A, Ambalavanan N, Tipple TE, Lal CV. Microbial-induced Redox Imbalance in the Neonatal Lung Is Ameliorated by Live Biotherapeutics. Am J Respir Cell Mol Biol 2023; 68:267-278. [PMID: 36287630 PMCID: PMC9989473 DOI: 10.1165/rcmb.2021-0508oc] [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: 11/19/2021] [Accepted: 10/24/2022] [Indexed: 11/24/2022] Open
Abstract
Bronchopulmonary dysplasia (BPD) is a common lung disease of premature infants. Hyperoxia exposure and microbial dysbiosis are contributors to BPD development. However, the mechanisms linking pulmonary microbial dysbiosis to worsening lung injury are unknown. Nrf2 (nuclear factor erythroid 2-related factor 2) is a transcription factor that regulates oxidative stress responses and modulates hyperoxia-induced lung injury. We hypothesized that airway dysbiosis would attenuate Nrf2-dependent antioxidant function, resulting in a more severe phenotype of BPD. Here, we show that preterm infants with a Gammaproteobacteria-predominant dysbiosis have increased endotoxin in tracheal aspirates, and mice monocolonized with the representative Gammaproteobacteria Escherichia coli show increased tissue damage compared with germ-free (GF) control mice. Furthermore, we show Nrf2-deficient mice have worse lung structure and function after exposure to hyperoxia when the airway microbiome is augmented with E. coli. To confirm the disease-initiating potential of airway dysbiosis, we developed a novel humanized mouse model by colonizing GF mice with tracheal aspirates from human infants with or without severe BPD, producing gnotobiotic mice with BPD-associated and non-BPD-associated lung microbiomes. After hyperoxia exposure, BPD-associated mice demonstrated a more severe BPD phenotype and increased expression of Nrf2-regulated genes, compared with GF and non-BPD-associated mice. Furthermore, augmenting Nrf2-mediated antioxidant activity by supporting colonization with Lactobacillus species improved dysbiotic-augmented lung injury. Our results demonstrate that a lack of protective pulmonary microbiome signature attenuates an Nrf2-mediated antioxidant response, which is augmented by a respiratory probiotic blend. We anticipate antioxidant pathways will be major targets of future microbiome-based therapeutics for respiratory disease.
Collapse
Affiliation(s)
| | | | - Luhua Qiao
- Division of Neonatology, Department of Pediatrics
| | | | | | | | | | | | - Amit Gaggar
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, The University of Alabama at Birmingham, Birmingham, Alabama; and
| | | | - Trent E. Tipple
- Section of Neonatal-Perinatal Medicine, Department of Pediatrics, The University of Oklahoma Health Science Center, Oklahoma City, Oklahoma
| | | |
Collapse
|
5
|
Buendía JA, Guerrero Patiño D, Lindarte EF. Vitamin A supplementation for the prevention of chronic lung disease in premature infants: A cost-utility analysis. Pediatr Pulmonol 2022; 57:2511-2517. [PMID: 35794801 DOI: 10.1002/ppul.26067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 06/18/2022] [Accepted: 07/03/2022] [Indexed: 11/11/2022]
Abstract
INTRODUCTION Despite the growing evidence on efficacy, little is known regarding the efficiency of Vitamin A supplementation to decrease the probability of chronic lung disease (CLD) in preterm infants. This study aims to determine the cost-utility of Vitamin A to prevent CLD in preterm infants in Colombia. METHODS A decision tree model was used to estimate the cost and quality-adjusted life-years (QALYs) of Vitamin A supplementation in preterm infants. Multiple sensitivity analyses were conducted to evaluate the robustness of the model. Cost-effectiveness was evaluated at a willingness-to-pay value of US$5180. RESULTS Vitamin A was associated with lower costs and higher QALYs. The expected annual cost per patient with Vitamin A was US$1579 (95% CI US$1555-US$1585) and without Vitamin A was US$1913 (95% CI US$1891-US$1934). The QALYs per person estimated with Vitamin A was 0.66 (95% CI 0.66-0.67) and without Vitamin A was 0.61 (95% CI 0.60-0.61). This position of absolute dominance (Vitamin A has lower costs and higher QALYs than without Vitamin A) is unnecessary to estimate the incremental cost-effectiveness ratio. CONCLUSION Our economic evaluation shows that Vitamin A is cost-effective to reduce the incidence rate of CLD in premature infants in Colombia. Our study provides evidence that should be used by decision-makers to improve clinical practice guidelines.
Collapse
Affiliation(s)
- Jefferson A Buendía
- Department of Pharmacology and Toxicology, Research Group in Pharmacology and Toxicology "INFARTO", University of Antioquia, Medellin, Colombia
| | - Diana Guerrero Patiño
- Department of Pharmacology and Toxicology, Research Group in Pharmacology and Toxicology "INFARTO", University of Antioquia, Medellin, Colombia
| | - Erika Fernanda Lindarte
- Department of Pharmacology and Toxicology, Research Group in Pharmacology and Toxicology "INFARTO", University of Antioquia, Medellin, Colombia
| |
Collapse
|
6
|
Tsotakos N, Ahmed I, Umstead TM, Imamura Y, Yau E, Silveyra P, Chroneos ZC. All trans-retinoic acid modulates hyperoxia-induced suppression of NF-kB-dependent Wnt signaling in alveolar A549 epithelial cells. PLoS One 2022; 17:e0272769. [PMID: 35947545 PMCID: PMC9365139 DOI: 10.1371/journal.pone.0272769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 07/26/2022] [Indexed: 11/19/2022] Open
Abstract
INTRODUCTION Despite recent advances in perinatal medicine, bronchopulmonary dysplasia (BPD) remains the most common complication of preterm birth. Inflammation, the main cause for BPD, results in arrested alveolarization. All trans-retinoic acid (ATRA), the active metabolite of Vitamin A, facilitates recovery from hyperoxia induced cell damage. The mechanisms involved in this response, and the genes activated, however, are poorly understood. In this study, we investigated the mechanisms of action of ATRA in human lung epithelial cells exposed to hyperoxia. We hypothesized that ATRA reduces hyperoxia-induced inflammatory responses in A549 alveolar epithelial cells. METHODS A549 cells were exposed to hyperoxia with or without treatment with ATRA, followed by RNA-seq analysis. RESULTS Transcriptomic analysis of A549 cells revealed ~2,000 differentially expressed genes with a higher than 2-fold change. Treatment of cells with ATRA alleviated some of the hyperoxia-induced changes, including Wnt signaling, cell adhesion and cytochrome P450 genes, partially through NF-κB signaling. DISCUSSION/CONCLUSION Our findings support the idea that ATRA supplementation may decrease hyperoxia-induced disruption of the neonatal respiratory epithelium and alleviate development of BPD.
Collapse
Affiliation(s)
- Nikolaos Tsotakos
- School of Science, Engineering, and Technology, Penn State Harrisburg, Middletown, Pennsylvania, United States
| | - Imtiaz Ahmed
- Department of Pediatrics, Division of Neonatal-Perinatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
| | - Todd M. Umstead
- Department of Pediatrics, Division of Neonatal-Perinatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
| | - Yuka Imamura
- Departments of Pharmacology and Biochemistry and Molecular Biology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
- Institute of Personalized Medicine, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
| | - Eric Yau
- Department of Pediatrics, Division of Neonatal-Perinatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
| | - Patricia Silveyra
- Department of Pediatrics, Division of Neonatal-Perinatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
- Department of Environmental and Occupational Health, School of Public Health, Indiana University Bloomington, Bloomington, Indiana, United States of America
- Division of Pulmonary, Critical Care, Sleep & Occupational Medicine, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Zissis C. Chroneos
- Department of Pediatrics, Division of Neonatal-Perinatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
- Institute of Personalized Medicine, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
- * E-mail:
| |
Collapse
|
7
|
Li S, Lei Y, Lei J, Li H. All‑trans retinoic acid promotes macrophage phagocytosis and decreases inflammation via inhibiting CD14/TLR4 in acute lung injury. Mol Med Rep 2021; 24:868. [PMID: 34676874 PMCID: PMC8554390 DOI: 10.3892/mmr.2021.12508] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 02/18/2021] [Indexed: 12/22/2022] Open
Abstract
Acute lung injury (ALI) is a common clinical emergency and all-trans retinoic acid (ATRA) can alleviate organ injury. Therefore, the present study investigated the role of ATRA in ALI. Lipopolysaccharide (LPS)-induced ALI rats were treated with ATRA and the arterial partial pressure of oxygen (PaO2), lung wet/dry weight (W/D) ratio and protein content in the bronchial alveolar lavage fluid (BALF) were measured to evaluate the effect of ATRA on ALI rats. Alveolar macrophages were isolated from the BALF. The phagocytic function of macrophages was detected using the chicken erythrocyte phagocytosis method and flow cytometry. The viability of macrophages was measured using a Cell Counting Kit-8 assay, and apoptosis was analyzed using a TUNEL assay and flow cytometry. The expression levels of Toll-like receptor 4 (TLR4) and cluster of differentiation (CD)14 on the macrophage membrane were detected by immunofluorescence staining. The protein levels of TLR4, CD14, phosphorylated (p)-65, p65, p-IκBα and IκBα were analyzed using western blotting. The concentrations of IL-6, IL-1β and macrophage inflammatory protein-2 in the plasma of rats were detected by ELISA. Macrophages were treated with IAXO-102 (TLR4 inhibitor) to verify the involvement of CD14/TLR4 in the effect of ATRA on ALI. ATRA provided protection against LPS-induced ALI, as evidenced by the increased PaO2 and reduced lung W/D ratio and protein content in the BALF. ATRA enhanced macrophage phagocytosis and viability and reduced apoptosis and inflammation in ALI rats. Mechanically, ATRA inhibited CD14 and TLR4 expression and NF-κB pathway activation. ATRA enhanced macrophage phagocytosis and reduced inflammation by inhibiting the CD14/TLR4-NF-κB pathway in LPS-induced ALI. In summary, ATRA inactivated the NF-κB pathway by inhibiting the expression of CD14/TLR4 receptor in the alveolar macrophages of rats, thus enhancing the phagocytic function of macrophages in ALI rats, improving the activity of macrophages, inhibiting apoptosis, reducing the levels of inflammatory factors, and consequently playing a protective role in ALI model rats. This study may offer novel insights for the clinical management of ALI.
Collapse
Affiliation(s)
- Shuangxue Li
- Department of Respiratory and Critical Care Medicine, Shanxi Provincial People's Hospital, Taiyuan, Shanxi 030012, P.R. China
| | - Yuansheng Lei
- Department of Neurology, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, P.R. China
| | - Jieyun Lei
- Department of Cardiology, Taiyuan Central Hospital, Taiyuan, Shanxi 030009, P.R. China
| | - Hui Li
- Department of Gynecology, Shanxi Provincial People's Hospital, Taiyuan, Shanxi 030012, P.R. China
| |
Collapse
|
8
|
Oxygen Toxicity to the Immature Lung-Part I: Pathomechanistic Understanding and Preclinical Perspectives. Int J Mol Sci 2021; 22:ijms222011006. [PMID: 34681665 PMCID: PMC8540649 DOI: 10.3390/ijms222011006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/08/2021] [Accepted: 10/11/2021] [Indexed: 01/13/2023] Open
Abstract
In utero, the fetus and its lungs develop in a hypoxic environment, where HIF-1α and VEGFA signaling constitute major determinants of further development. Disruption of this homeostasis after preterm delivery and extrauterine exposure to high fractions of oxygen are among the key events leading to bronchopulmonary dysplasia (BPD). Reactive oxygen species (ROS) production constitutes the initial driver of pulmonary inflammation and cell death, altered gene expression, and vasoconstriction, leading to the distortion of further lung development. From preclinical studies mainly performed on rodents over the past two decades, the deleterious effects of oxygen toxicity and the injurious insults and downstream cascades arising from ROS production are well recognized. This article provides a concise overview of disease drivers and different therapeutic approaches that have been successfully tested within experimental models. Despite current studies, clinical researchers are still faced with an unmet clinical need, and many of these strategies have not proven to be equally effective in clinical trials. In light of this challenge, adapting experimental models to the complexity of the clinical situation and pursuing new directions constitute appropriate actions to overcome this dilemma. Our review intends to stimulate research activities towards the understanding of an important issue of immature lung injury.
Collapse
|
9
|
Ali A, Zambrano R, Duncan MR, Chen S, Luo S, Yuan H, Chen P, Benny M, Schmidt A, Young K, Kerr N, de Rivero Vaccari JP, Keane RW, Dietrich WD, Wu S. Hyperoxia-activated circulating extracellular vesicles induce lung and brain injury in neonatal rats. Sci Rep 2021; 11:8791. [PMID: 33888735 PMCID: PMC8062626 DOI: 10.1038/s41598-021-87706-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 03/16/2021] [Indexed: 01/02/2023] Open
Abstract
Hyperoxia-induced lung injury plays a key role in the development of bronchopulmonary dysplasia (BPD), characterized by inflammatory injury and impaired lung development in preterm infants. Although BPD is a predictor of poor neurodevelopmental outcomes, currently it is uncertain how lung injury contributes to brain injury in preterm infants. Extracellular vesicles (EVs) are a heterogeneous group of cell-derived membranous structures that regulate intercellular and inter-organ communications. Gasdermin D (GSDMD) has emerged as a key executor of inflammasome-mediated cell death and inflammation. In this study, we utilized a neonatal rat model of BPD to assess if hyperoxia stimulates lung release of circulating EVs and if these EVs induce lung and brain injury. We found that hyperoxia-exposed rats had elevated numbers of plasma-derived EVs compared to rats maintained in room air. These EVs also had increased cargos of surfactant protein C, a marker of type II alveolar epithelial cells (AEC), and the active (p30) form of GSDMD. When these EVs were adoptively transferred into normal newborn rats via intravenous injection, they were taken up both by lung and brain tissues. Moreover, EVs from hyperoxic animals induced not only the pathological hallmarks of BPD, but also brain inflammatory injury in recipient rats, as well as inducing cell death in cultured pulmonary vascular endothelial cells and neural stem cells (NSC). Similarly, hyperoxia-exposed cultured AEC-like cells released EVs that also contained increased GSDMD-p30 and these EVs induced pyroptotic cell death in NSC. Overall, these data indicate that hyperoxia-activated circulating EVs mediate a lung to brain crosstalk resulting in brain injury and suggest a mechanism that links lung injury and neurodevelopmental impairment in BPD infants.
Collapse
Affiliation(s)
- Anum Ali
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Ronald Zambrano
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Matthew R Duncan
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Shaoyi Chen
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Shihua Luo
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Huijun Yuan
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Pingping Chen
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Merline Benny
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Augusto Schmidt
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Karen Young
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA
| | - Nadine Kerr
- Department of Neurological Surgery, Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, USA.,Department of Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Juan Pablo de Rivero Vaccari
- Department of Neurological Surgery, Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, USA.,Department of Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Robert W Keane
- Department of Neurological Surgery, Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, USA.,Department of Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, FL, USA
| | - W Dalton Dietrich
- Department of Neurological Surgery, Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, USA
| | - Shu Wu
- Division of Neonatology and Batchelor Children's Research Institute, Department of Pediatrics, University of Miami Miller School of Medicine, P. O. Box 016960, Miami, FL, 33101, USA.
| |
Collapse
|
10
|
Freeman A, Qiao L, Olave N, Rezonzew G, Gentle S, Halloran B, Pryhuber GS, Gaggar A, Tipple TE, Ambalavanan N, Lal CV. MicroRNA 219-5p inhibits alveolarization by reducing platelet derived growth factor receptor-alpha. Respir Res 2021; 22:57. [PMID: 33596914 PMCID: PMC7891005 DOI: 10.1186/s12931-021-01654-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 02/07/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND MicroRNA (miR) are small conserved RNA that regulate gene expression post-transcription. Previous genome-wide analysis studies in preterm infants indicate that pathways of miR 219-5p are important in infants with Bronchopulmonary Dysplasia (BPD). METHODS Here we report a prospective cohort study of extremely preterm neonates wherein infants diagnosed with severe BPD expressed increased airway miR-219-5p and decreased platelet derived growth factor receptor alpha (PDGFR-α), a target of mir-219-5p and a key regulator of alveolarization, compared to post-conception age-matched term infants. RESULTS miR-219-5p was highly expressed in the pulmonary epithelial lining in lungs of infants with BPD by in situ hybridization of human infant lungs. In both in vitro and in vivo (mouse) models of BPD, miR-219-5p was increased on exposure to hyperoxia compared with the normoxia control, with a complementary decrease of PDGFR-α. To further confirm the target relationship between miR-219 and PDGFR-α, pulmonary epithelial cells (MLE12) and lung primary fibroblasts were treated with a mimic of miR-219-5p and a locked nucleic acid (LNA) based inhibitor of miR-219-5p. In comparison with the control group, the level of miR-219 increased significantly after miR-219 mimic treatment, while the level of PDGFR-α declined markedly. LNA exposure increased PDGFR-α. Moreover, in BPD mouse model, over-expression of miR-219-5p inhibited alveolar development, indicated by larger alveolar spaces accompanied by reduced septation. CONCLUSIONS Taken together, our results demonstrate that increased miR-219-5p contributes to the pathogenesis of BPD by targeting and reducing PDGFR-α. The use of specific miRNA antagonists may be a therapeutic strategy for preventing the development of BPD.
Collapse
Affiliation(s)
- Amelia Freeman
- Division of Neonatology, Department of Pediatrics, Women and Infants Center, University of Alabama At Birmingham, 176F Suite 9380619 South 19th Street, Birmingham, AL, 35249-7335, USA
| | - Luhua Qiao
- Division of Neonatology, Department of Pediatrics, Women and Infants Center, University of Alabama At Birmingham, 176F Suite 9380619 South 19th Street, Birmingham, AL, 35249-7335, USA
| | - Nelida Olave
- Division of Neonatology, Department of Pediatrics, Women and Infants Center, University of Alabama At Birmingham, 176F Suite 9380619 South 19th Street, Birmingham, AL, 35249-7335, USA
| | - Gabriel Rezonzew
- Division of Neonatology, Department of Pediatrics, Women and Infants Center, University of Alabama At Birmingham, 176F Suite 9380619 South 19th Street, Birmingham, AL, 35249-7335, USA
| | - Samuel Gentle
- Division of Neonatology, Department of Pediatrics, Women and Infants Center, University of Alabama At Birmingham, 176F Suite 9380619 South 19th Street, Birmingham, AL, 35249-7335, USA
| | - Brian Halloran
- Division of Neonatology, Department of Pediatrics, Women and Infants Center, University of Alabama At Birmingham, 176F Suite 9380619 South 19th Street, Birmingham, AL, 35249-7335, USA
| | - Gloria S Pryhuber
- Department of Pediatrics, University of Rochester Medical Center, Rochester, NY, USA
| | - Amit Gaggar
- Program in Matrix and Pulmonary Biology, Department of Medicine, University of Alabama, Birmingham, AL, USA
| | - Trent E Tipple
- Center for Pregnancy and Newborn Research, Section of Neonatal-Perinatal Medicine, University of Oklahoma College of Medicine, Oklahoma, OK, USA
| | - Namasivayam Ambalavanan
- Division of Neonatology, Department of Pediatrics, Women and Infants Center, University of Alabama At Birmingham, 176F Suite 9380619 South 19th Street, Birmingham, AL, 35249-7335, USA
| | - Charitharth Vivek Lal
- Division of Neonatology, Department of Pediatrics, Women and Infants Center, University of Alabama At Birmingham, 176F Suite 9380619 South 19th Street, Birmingham, AL, 35249-7335, USA.
- Program in Matrix and Pulmonary Biology, Department of Medicine, University of Alabama, Birmingham, AL, USA.
| |
Collapse
|
11
|
Addis DR, Molyvdas A, Ambalavanan N, Matalon S, Jilling T. Halogen exposure injury in the developing lung. Ann N Y Acad Sci 2020; 1480:30-43. [PMID: 32738176 DOI: 10.1111/nyas.14445] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 06/19/2020] [Accepted: 07/30/2020] [Indexed: 12/27/2022]
Abstract
Owing to a high-volume industrial usage of the halogens chlorine (Cl2 ) and bromine (Br2 ), they are stored and transported in abundance, creating a risk for accidental or malicious release to human populations. Despite extensive efforts to understand the mechanisms of toxicity upon halogen exposure and to develop specific treatments that could be used to treat exposed individuals or large populations, until recently, there has been little to no effort to determine whether there are specific features and or the mechanisms of halogen exposure injury in newborns or children. We established a model of neonatal halogen exposure and published our initial findings. In this review, we aim to contrast and compare the findings in neonatal mice exposed to Br2 with the findings published on adult mice exposed to Br2 and the neonatal murine models of bronchopulmonary dysplasia. Despite remarkable similarities across these models in overall alveolar architecture, there are distinct functional and apparent mechanistic differences that are characteristic of each model. Understanding the mechanistic and functional features that are characteristic of the injury process in neonatal mice exposed to halogens will allow us to develop countermeasures that are appropriate for, and effective in, this unique population.
Collapse
Affiliation(s)
- Dylan R Addis
- Department of Anesthesiology and Perioperative Medicine, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama.,Division of Molecular and Translational Biomedicine, Pulmonary Injury and Repair Center, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama.,UAB Comprehensive Cardiovascular Center, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Adam Molyvdas
- Department of Anesthesiology and Perioperative Medicine, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama.,Division of Molecular and Translational Biomedicine, Pulmonary Injury and Repair Center, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Namasivayam Ambalavanan
- Division of Neonatology, Department of Pediatrics, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Sadis Matalon
- Department of Anesthesiology and Perioperative Medicine, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama.,Division of Molecular and Translational Biomedicine, Pulmonary Injury and Repair Center, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Tamas Jilling
- Division of Neonatology, Department of Pediatrics, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama.,Department of Pediatrics, the University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| |
Collapse
|
12
|
Club Cell Heme Oxygenase-1 Deletion: Effects in Hyperoxia-Exposed Adult Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:2908271. [PMID: 32587658 PMCID: PMC7303751 DOI: 10.1155/2020/2908271] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/29/2020] [Accepted: 05/16/2020] [Indexed: 02/06/2023]
Abstract
Thioredoxin reductase-1 (TXNRD1) inhibition activates nuclear factor (erythroid-derived 2)-like 2 (Nrf2) responses and prevents acute lung injury (ALI). Heme oxygenase-1 (HO-1) induction following TXNRD1 inhibition is Nrf2-dependent in airway epithelial (club) cells in vitro. The influence of club cell HO-1 on lung development and lung injury responses is poorly understood. The present studies characterized the effects of hyperoxia on club cell-specific HO-1 knockout (KO) mice. These mice were generated by crossing Hmox1 flox mice with transgenic mice expressing cre recombinase under control of the club cell-specific Scgb1a1 promoter. Baseline analyses of lung architecture and function performed in age-matched adult wild-type and KO mice indicated an increased alveolar size and airway resistance in HO-1 KO mice. In subsequent experiments, adult wild-type and HO-1 KO mice were either continuously exposed to >95% hyperoxia or room air for 72 h or exposed to >95 hyperoxia for 48 h followed by recovery in room air for 48 h. Injury was quantitatively assessed by calculating right lung/body weight ratios (g/kg). Analyses indicated an independent effect of hyperoxia but not genotype on right lung/body weight ratios in both wild-type and HO-1 KO mice. The magnitude of increases in right lung/body weight ratios was similar in mice of both genotypes. In the recovery model, an independent effect of hyperoxia but not genotype was also detected. In contrast to the continuous exposure model, right lung/body weight ratio mice were significantly elevated in HO-1 KO but not wild-type mice. Though club cell HO-1 does not alter hyperoxic sensitivity in adult mice, it significantly influences lung development and resolution of lung injury following acute hyperoxic exposure.
Collapse
|
13
|
Zheng J, He Q, Tang H, Li J, Xu H, Mao X, Liu G. Overexpression of miR-455-5p affects retinol (vitamin A) absorption by downregulating STRA6 in a nitrofen-induced CDH with lung hypoplasia rat model. Pediatr Pulmonol 2020; 55:1433-1439. [PMID: 32237270 PMCID: PMC7318713 DOI: 10.1002/ppul.24739] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 03/10/2020] [Indexed: 12/23/2022]
Abstract
Lung hypoplasia is the main cause of congenital diaphragmatic hernia (CDH)-associated death but pathogenesis remains unclear. MiR-455-5p is involved in lung hypoplasia. We hypothesized that nitrofen causes abnormal miR-455-5p expression during lung development and designed this study to determine the relationship between miR-455-5p, stimulated by retinoic acid 6 (STRA6), and retinol in a nitrofen-induced CDH with lung hypoplasia rat model. Nitrofen or olive oil was administered to Sprague-Dawley rats by gavage on day 9.5 of gestation, and the rats were divided into a nitrofen group and a control group (n = 6). The left lung of fetuses was dissected on day 15.5. The expression of miR-455-5p or STRA6 messenger RNA (mRNA) was determined by quantitative real-time polymerase chain reaction. Average integrated optical density (IOD) of STRA6 protein was determined by immunofluorescence histochemistry. The average retinol level was detected by enzyme-linked immunosorbent assay (n = 6 lungs, respectively). Compared with the control group, the nitrofen group exhibited significantly increased miR-455-5p expression levels (29.450 ± 9.253 vs 5.955 ± 2.330; P = .00045) and significantly decreased STRA6 mRNA levels (0.197 ± 0.097 vs 0.588 ± 0.184; P = .0047). In addition, the average IOD of the STRA6 protein was significantly lower in the nitrofen group (805.643 ± 291.182 vs 1616.391 ± 572.308, P = .015), and the average retinol level was significantly reduced (4.013 ± 0.195 vs 5.317 ± 0.337 µg/L, P = .000). In summary, the overexpression of miR-455-5p affected retinol absorption by downregulating STRA6 in the nitrofen-induced CDH with lung hypoplasia rat model, and this downregulation may be one cause of CDH with lung hypoplasia.
Collapse
Affiliation(s)
- Jintao Zheng
- Department of Neonatal and Pediatric Surgery, Foshan Women and Children Hospital Affiliated to Southern Medical University, Guangdong, China
| | - Qiuming He
- Department of Pediatric Surgery, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong, China
| | - Huajian Tang
- Department of Neonatal and Pediatric Surgery, Foshan Women and Children Hospital Affiliated to Southern Medical University, Guangdong, China
| | - Jiequan Li
- Department of Neonatal and Pediatric Surgery, Foshan Women and Children Hospital Affiliated to Southern Medical University, Guangdong, China
| | - Huiyu Xu
- Department of Neonatal and Pediatric Surgery, Foshan Women and Children Hospital Affiliated to Southern Medical University, Guangdong, China
| | - Xiangming Mao
- Department of Urology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Guoqing Liu
- Department of Neonatal and Pediatric Surgery, Foshan Women and Children Hospital Affiliated to Southern Medical University, Guangdong, China
| |
Collapse
|
14
|
Morty RE. Using Experimental Models to Identify Pathogenic Pathways and Putative Disease Management Targets in Bronchopulmonary Dysplasia. Neonatology 2020; 117:233-239. [PMID: 32485712 DOI: 10.1159/000506989] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 03/03/2020] [Indexed: 11/19/2022]
Abstract
Bronchopulmonary dysplasia (BPD) is a common and serious complication of preterm birth. Limited pharmacological and other medical interventions are currently available for the management of severely affected, very preterm infants. BPD can be modelled in preclinical studies using experimental animals, and experimental animal models have been extremely valuable in the development of hallmark clinical management strategies for BPD, including pulmonary surfactant replacement and single-course antenatal corticosteroids. A gradual move away from large animal models of BPD in favor of term-born rodents has facilitated the identification of a multitude of new mechanisms of normal and stunted lung development, but this has also potentially limited the utility of experimental animal models for the identification of pathogenic pathways and putative disease management targets in BPD. Indeed, more recent pharmacological interventions for the management of BPD that have been validated in randomized controlled trials have relied very little on preclinical data generated in experimental animal models. While rodent-based models of BPD have tremendous advantages in terms of the availability of genetic tools, they also have considerable drawbacks, including limited utility for studying breathing mechanics, gas exchange, and pulmonary hemodynamics; and they have a less relevant clinical context where lung prematurity and a background of infection are now rarely present in the pathophysiology under study. There is a pressing need to refine existing models to better recapitulate pathological processes at play in affected infants, in order to better evaluate new candidate pharmacological and other interventions for the management of BPD.
Collapse
Affiliation(s)
- Rory E Morty
- Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany, .,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Giessen, Germany,
| |
Collapse
|
15
|
Dolma K, Freeman AE, Rezonzew G, Payne GA, Xu X, Jilling T, Blalock JE, Gaggar A, Ambalavanan N, Lal CV. Effects of hyperoxia on alveolar and pulmonary vascular development in germ-free mice. Am J Physiol Lung Cell Mol Physiol 2019; 318:L421-L428. [PMID: 31644312 DOI: 10.1152/ajplung.00316.2019] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Airway microbial dysbiosis is associated with subsequent bronchopulmonary dysplasia (BPD) development in very preterm infants. However, the relationship of airway microbiome in normal pulmonary development has not been defined. To better understand the role of the airway microbiome, we compared normal and abnormal alveolar and pulmonary vascular development in mice with or without a microbiome. We hypothesized that the lungs of germ-free (GF) mice would have an exaggerated phenotypic response to hyperoxia compared with non-germ-free (NGF) mice. With the use of a novel gnotobiotic hyperoxia chamber, GF and NGF mice were exposed to either normoxia or hyperoxia. Alveolar morphometry, pulmonary mechanics, echocardiograms, inflammatory markers, and measures of pulmonary hypertension were studied. GF and NGF mice in normoxia showed no difference, whereas GF mice in hyperoxia showed protected lung structure and mechanics and decreased markers of inflammation compared with NGF mice. We speculate that an increase in abundance of pathogenic bacteria in NGF mice may play a role in BPD pathogenesis by regulating the proinflammatory signaling and neutrophilic inflammation in lungs. Manipulation of the airway microbiome may be a potential therapeutic intervention in BPD and other lung diseases.
Collapse
Affiliation(s)
- Kalsang Dolma
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama.,Division of Neonatology, Department of Pediatrics, University of South Alabama, Mobile, Alabama
| | - Amelia E Freeman
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Gabriel Rezonzew
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Gregory A Payne
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Xin Xu
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Tamas Jilling
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
| | - J Edwin Blalock
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Amit Gaggar
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Namasivayam Ambalavanan
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Charitharth Vivek Lal
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama.,Division of Neonatology, Department of Pediatrics, University of South Alabama, Mobile, Alabama
| |
Collapse
|
16
|
Dylag AM, Raffay TM. Rodent models of respiratory control and respiratory system development-Clinical significance. Respir Physiol Neurobiol 2019; 268:103249. [PMID: 31315068 DOI: 10.1016/j.resp.2019.06.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 05/24/2019] [Accepted: 06/29/2019] [Indexed: 01/13/2023]
Abstract
The newborn infant's respiratory system must rapidly adapt to extra-uterine life. Neonatal rat and mouse models have been used to investigate early development of respiratory control and reactivity in both health and disease. This review highlights several rodent models of control of breathing and respiratory system development (including pulmonary function), discusses their translational strengths and limitations, and underscores the importance of creating clinically relevant models applicable to the human infant.
Collapse
Affiliation(s)
- Andrew M Dylag
- Division of Neonatology, Golisano Children's Hospital, Department of Pediatrics, University of Rochester, Rochester, NY, United States
| | - Thomas M Raffay
- Division of Neonatology, Rainbow Babies & Children's Hospital, Department of Pediatrics, Case Western Reserve University, Cleveland, OH, United States.
| |
Collapse
|
17
|
Zheng J, He Q, Tang H, Xia H. miR-455-5p Overexpression Reduces Rat Lung Alveolar Type II Cell Proliferation by Downregulating STRA6. Anat Rec (Hoboken) 2019; 302:2062-2069. [PMID: 31087788 PMCID: PMC6851624 DOI: 10.1002/ar.24145] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 11/26/2018] [Accepted: 12/26/2018] [Indexed: 11/12/2022]
Abstract
miR‐455‐5p and retinoid signaling pathway and its membrane receptor, STRA6, are associated with lung development. Software copredictions indicate that the miRNA upstream of the STRA6 gene is miR‐455‐5p. We hypothesized that miR‐455‐5p participates in rat lung alveolar Type II cell proliferation by targeting STRA6 and designed this study to investigate the effects of miR‐455‐5p overexpression on rat lung alveolar Type II cells. Dual luciferase reporter gene assay was utilized to confirm the relationship between miR‐455‐5p and STRA6. An miR‐455‐5p‐expressing adenoviral vector was constructed and transfected into rat lung alveolar Type II cells. STRA6 protein expression was detected in rat lung alveolar Type II cells by Western blotting at 72 hr posttransfection. Retinol concentration was detected by ELISA at 72 hr posttransfection. The cell proliferation was detected by CCK8 assay at 24, 48, and 72 hr posttransfection. Our results showed that STRA6 is a target gene of miR‐455‐5p. STRA6 protein expression was significantly lower in the miR‐455‐5p‐overexpression group than in the NC group (0.615 ± 0.131 vs. 0.958 ± 0.246, P = 0.029). Similar results were observed for retinol concentration (2.985 ± 0.061 vs. 3.949 ± 0.118, P = 0.000). Rat lung alveolar Type II cell proliferation was lower in the miR‐455‐5p‐overexpression group than in the NC group at 24, 48, and 72 hr posttransfection (24 hr: 0.280 ± 0.184 vs. 1.354 ± 0.169 P = 0.026; 48 hr: 0.881 ± 0.016 vs. 1.992 ± 0.050 P = 0.001; 72 hr: 2.105 ± 0.148 vs. 2.937 ± 0.079 P = 0.016). In summary, miR‐455‐5p is associated with lung development. miR‐455‐5p overexpression downregulates STRA6, leading to reduced retinol concentration and rat lung alveolar Type II cell proliferation. Anat Rec, 302:2062–2069, 2019. © 2019 The Authors. The Anatomical Record published by Wiley Periodicals, Inc. on behalf of American Association of Anatomists.
Collapse
Affiliation(s)
- Jintao Zheng
- Department of Pediatric Surgery, Foshan Maternity and Children's Healthcare Hospital Affiliated to Southern Medical University, Guangzhou, Guangdong, China.,Department of Pediatric Surgery, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Qiuming He
- Department of Pediatric Surgery, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Huajian Tang
- Department of Pediatric Surgery, Foshan Maternity and Children's Healthcare Hospital Affiliated to Southern Medical University, Guangzhou, Guangdong, China
| | - Huimin Xia
- Department of Pediatric Surgery, Foshan Maternity and Children's Healthcare Hospital Affiliated to Southern Medical University, Guangzhou, Guangdong, China.,Department of Pediatric Surgery, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| |
Collapse
|
18
|
Rakshasbhuvankar AA, Patole SK, Simmer K, Pillow J. Vitamin A supplementation for prevention of mortality and morbidity in moderate and late preterm infants. Hippokratia 2019. [DOI: 10.1002/14651858.cd013322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Abhijeet A Rakshasbhuvankar
- King Edward Memorial Hospital for Women; Department of Neonatal Paediatrics; 374 Bagot Road Subiaco WA Australia 6008
| | - Sanjay K Patole
- King Edward Memorial Hospital; School of Paediatrics and Child Health, School of Women's and Infants' Health, University of Western Australia; 374 Bagot Rd Subiaco Perth Western Australia Australia 6008
| | - Karen Simmer
- King Edward Memorial Hospital for Women and Princess Margaret Hospital for Children; Neonatal Care Unit; Bagot Road Subiaco WA Australia 6008
| | - Jane Pillow
- King Edward Memorial Hospital; School of Women's and Infant's Health, University of Western Australia; 374 Bagot Rd Subiaco Perth Western Australia Australia 6008
| |
Collapse
|
19
|
Olave N, Lal CV, Halloran B, Bhandari V, Ambalavanan N. Iloprost attenuates hyperoxia-mediated impairment of lung development in newborn mice. Am J Physiol Lung Cell Mol Physiol 2018; 315:L535-L544. [PMID: 29952221 PMCID: PMC6230878 DOI: 10.1152/ajplung.00125.2017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 05/21/2018] [Accepted: 06/21/2018] [Indexed: 11/22/2022] Open
Abstract
Cyclooxygenase-2 (COX-2/PTGS2) mediates hyperoxia-induced impairment of lung development in newborn animals and is increased in the lungs of human infants with bronchopulmonary dysplasia (BPD). COX-2 catalyzes the production of cytoprotective prostaglandins, such as prostacyclin (PGI2), as well as proinflammatory mediators, such as thromboxane A2. Our objective was to determine whether iloprost, a synthetic analog of PGI2, would attenuate hyperoxia effects in the newborn mouse lung. To test this hypothesis, newborn C57BL/6 mice along with their dams were exposed to normoxia (21% O2) or hyperoxia (85% O2) from 4 to 14 days of age in combination with daily intraperitoneal injections of either iloprost 200 µg·kg-1·day-1, nimesulide (selective COX-2 antagonist) 100 mg·kg-1·day-1, or vehicle. Alveolar development was estimated by radial alveolar counts and mean linear intercepts. Lung function was determined on a flexiVent, and multiple cytokines and myeloperoxidase (MPO) were quantitated in lung homogenates. Lung vascular and microvascular morphometry was performed, and right ventricle/left ventricle ratios were determined. We determined that iloprost (but not nimesulide) administration attenuated hyperoxia-induced inhibition of alveolar development and microvascular density in newborn mice. Iloprost and nimesulide both attenuated hyperoxia-induced, increased lung resistance but did not improve lung compliance that was reduced by hyperoxia. Iloprost and nimesulide reduced hyperoxia-induced increases in MPO and some cytokines (IL-1β and TNF-α) but not others (IL-6 and KC/Gro). There were no changes in pulmonary arterial wall thickness or right ventricle/left ventricle ratios. We conclude that iloprost improves lung development and reduces lung inflammation in a newborn mouse model of BPD.
Collapse
Affiliation(s)
- Nelida Olave
- Department of Pediatrics, University of Alabama at Birmingham , Birmingham, Alabama
| | | | - Brian Halloran
- Department of Pediatrics, University of Alabama at Birmingham , Birmingham, Alabama
| | - Vineet Bhandari
- Department of Pediatrics, Drexel University College of Medicine , Philadelphia, Pennsylvania
| | | |
Collapse
|
20
|
Lal CV, Olave N, Travers C, Rezonzew G, Dolma K, Simpson A, Halloran B, Aghai Z, Das P, Sharma N, Xu X, Genschmer K, Russell D, Szul T, Yi N, Blalock JE, Gaggar A, Bhandari V, Ambalavanan N. Exosomal microRNA predicts and protects against severe bronchopulmonary dysplasia in extremely premature infants. JCI Insight 2018. [PMID: 29515035 DOI: 10.1172/jci.insight.93994] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Premature infants are at high risk for developing bronchopulmonary dysplasia (BPD), characterized by chronic inflammation and inhibition of lung development, which we have recently identified as being modulated by microRNAs (miRNAs) and alterations in the airway microbiome. Exosomes and exosomal miRNAs may regulate cell differentiation and tissue and organ development. We discovered that tracheal aspirates from infants with severe BPD had increased numbers of, but smaller, exosomes compared with term controls. Similarly, bronchoalveolar lavage fluid from hyperoxia-exposed mice (an animal model of BPD) and supernatants from hyperoxia-exposed human bronchial epithelial cells (in vitro model of BPD) had increased exosomes compared with air controls. Next, in a prospective cohort study of tracheal aspirates obtained at birth from extremely preterm infants, utilizing independent discovery and validation cohorts, we identified unbiased exosomal miRNA signatures predictive of severe BPD. The strongest signal of reduced miR-876-3p in BPD-susceptible compared with BPD-resistant infants was confirmed in the animal model and in vitro models of BPD. In addition, based on our recent discovery of increased Proteobacteria in the airway microbiome being associated with BPD, we developed potentially novel in vivo and in vitro models for BPD combining Proteobacterial LPS and hyperoxia exposure. Addition of LPS led to a larger reduction in exosomal miR 876-3p in both hyperoxia and normoxia compared with hyperoxia alone, thus indicating a potential mechanism by which alterations in microbiota can suppress miR 876-3p. Gain of function of miR 876-3p improved the alveolar architecture in the in vivo BPD model, demonstrating a causal link between miR 876-3p and BPD. In summary, we provide evidence for the strong predictive biomarker potential of miR 876-3p in severe BPD. We also provide insights on the pathogenesis of neonatal lung disease, as modulated by hyperoxia and microbial product-induced changes in exosomal miRNA 876-3p, which could be targeted for future therapeutic development.
Collapse
Affiliation(s)
- Charitharth Vivek Lal
- Department of Pediatrics.,Translational Research in Disordered and Normal Development Program, and.,Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA
| | - Nelida Olave
- Department of Pediatrics.,Translational Research in Disordered and Normal Development Program, and
| | | | - Gabriel Rezonzew
- Department of Pediatrics.,Translational Research in Disordered and Normal Development Program, and
| | | | | | - Brian Halloran
- Department of Pediatrics.,Translational Research in Disordered and Normal Development Program, and
| | - Zubair Aghai
- Department of Pediatrics, Thomas Jefferson University/Nemours, Philadelphia, Pennsylvania, USA
| | - Pragnya Das
- Department of Pediatrics, Drexel University, Philadelphia, Pennsylvania, USA
| | - Nirmal Sharma
- Division of Pulmonary, Allergy and Critical Care Medicine, and
| | - Xin Xu
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA.,Division of Pulmonary, Allergy and Critical Care Medicine, and
| | - Kristopher Genschmer
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA.,Division of Pulmonary, Allergy and Critical Care Medicine, and
| | - Derek Russell
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA.,Division of Pulmonary, Allergy and Critical Care Medicine, and
| | - Tomasz Szul
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA.,Division of Pulmonary, Allergy and Critical Care Medicine, and
| | - Nengjun Yi
- Department of Biostatistics, School of Public Health, UAB, Alabama, USA
| | - J Edwin Blalock
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA.,Division of Pulmonary, Allergy and Critical Care Medicine, and
| | - Amit Gaggar
- Program in Protease and Matrix Biology, Department of Medicine, University of Alabama at Birmingham (UAB), Birmingham, Alabama, USA.,Division of Pulmonary, Allergy and Critical Care Medicine, and
| | - Vineet Bhandari
- Department of Pediatrics, Drexel University, Philadelphia, Pennsylvania, USA
| | - Namasivayam Ambalavanan
- Department of Pediatrics.,Translational Research in Disordered and Normal Development Program, and
| |
Collapse
|
21
|
Jilling T, Ren C, Yee A, Aggarwal S, Halloran B, Ambalavanan N, Matalon S. Exposure of neonatal mice to bromine impairs their alveolar development and lung function. Am J Physiol Lung Cell Mol Physiol 2017; 314:L137-L143. [PMID: 28912380 DOI: 10.1152/ajplung.00315.2017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The halogen bromine (Br2) is used extensively in industry and stored and transported in large quantities. Its accidental or malicious release into the atmosphere has resulted in significant casualties. The pathophysiology of Br2-induced lung injury has been studied in adult animals, but the consequences of Br2 exposure to the developing lung are completely unknown. We exposed neonatal mouse littermates on postnatal day 3 (P3) to either Br2 at 400 ppm for 30 min (400/30), to Br2 at 600 ppm for 30 min (600/30), or to room air, then returned them to their dams and observed until P14. Mice exposed to Br2 had decreased survival (S) and had decreased weight (W) at P14 in the 400/30 group (S = 63.5%, W = 6.67 ± 0.08) and in the 600/30 group (S = 36.1%, W = 5.13 ± 0.67) as compared with air breathing mice (S = 100%, W = 7.96 ± 0.30). Alveolar development was impaired, as evidenced by increased mean linear intercept at P14. At P14, Br2 exposed mice also exhibited a decrease of arterial partial pressure of oxygen, decreased quasi-static lung compliance, as well as increased alpha smooth muscle actin mRNA and protein and increased mRNA for IL-1β, IL-6, CXCL1, and TNFα. Global gene expression, evaluated by RNA sequencing and Ingenuity Pathway Analysis, revealed persistent abnormalities in gene expression profiles at P14 involving pathways of "formation of lung" and "pulmonary development." The data indicate that Br2 inhalation injury early in life results in severe lung developmental consequences, wherein persistent inflammation and global altered developmental gene expression are likely mechanistic contributors.
Collapse
Affiliation(s)
- Tamas Jilling
- Department of Pediatrics (Neonatology), University of Alabama at Birmingham , Birmingham, Alabama
| | - Changchun Ren
- Department of Pediatrics (Neonatology), University of Alabama at Birmingham , Birmingham, Alabama
| | - Aaron Yee
- Department of Pediatrics (Neonatology), University of Alabama at Birmingham , Birmingham, Alabama
| | - Saurabh Aggarwal
- Department of Anesthesiology and Perioperative Medicine (Molecular and Translational Biomedicine), University of Alabama at Birmingham , Birmingham, Alabama
| | - Brian Halloran
- Department of Pediatrics (Neonatology), University of Alabama at Birmingham , Birmingham, Alabama
| | - Namasivayam Ambalavanan
- Department of Pediatrics (Neonatology), University of Alabama at Birmingham , Birmingham, Alabama
| | - Sadis Matalon
- Department of Anesthesiology and Perioperative Medicine (Molecular and Translational Biomedicine), University of Alabama at Birmingham , Birmingham, Alabama
| |
Collapse
|
22
|
Ramani M, van Groen T, Kadish I, Ambalavanan N, McMahon LL. Vitamin A and retinoic acid combination attenuates neonatal hyperoxia-induced neurobehavioral impairment in adult mice. Neurobiol Learn Mem 2017; 141:209-216. [DOI: 10.1016/j.nlm.2017.04.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 03/16/2017] [Accepted: 04/26/2017] [Indexed: 01/10/2023]
|
23
|
Bouch S, O'Reilly M, de Haan JB, Harding R, Sozo F. Does lack of glutathione peroxidase 1 gene expression exacerbate lung injury induced by neonatal hyperoxia in mice? Am J Physiol Lung Cell Mol Physiol 2017; 313:L115-L125. [PMID: 28385808 DOI: 10.1152/ajplung.00039.2016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 03/01/2017] [Accepted: 04/03/2017] [Indexed: 11/22/2022] Open
Abstract
Supplemental oxygen (O2) increases the risk of lung injury in preterm infants, owing to an immature antioxidant system. Our objective was to determine whether impairing antioxidant defense by decreasing glutathione peroxidase 1 (GPx1) gene expression increases the injurious effects of hyperoxia (Hyp). GPx1+/+ and GPx1-/- C57Bl/6J mice were exposed to 21% O2 (Air) or 40% O2 (Hyp) from birth to postnatal day 7 (P7d); they were euthanized on P7d or maintained in air until adulthood [postnatal day 56 (P56d)] to assess short-term and long-term effects, respectively. We assessed lung architecture, three markers of pulmonary oxidative stress (P7d, P56d), macrophages in lung tissue (P7d), immune cells in bronchoalveolar lavage fluid (BALF; P56d), and GPx1-4 and catalase gene expression in lung tissue (P7d, P56d). On P7d, macrophages were decreased by lack of GPx1 expression and further decreased by hyperoxia. GPx1 expression was increased in GPx1+/+Hyp mice and decreased in both GPx1-/- groups. On P56d, heme oxygenase-1 was increased by hyperoxia when GPx1 was absent. There were significantly more immune cells from Hyp groups than from the GPx1+/+Air group and a greater proportion of lymphocytes in GPx1-/-Hyp mice. GPx1 expression was significantly decreased in GPx1-/- mice; GPx2-4 and catalase expression was increased in GPx1-/-Hyp mice compared with other groups. Tissue fraction was decreased in GPx1-/-Air mice; bronchiolar smooth muscle was decreased in GPx1-/- mice. GPx1 does not clearly exacerbate hyperoxia-induced increases in oxidative stress or lung injury but may alter pulmonary immune function. Increased expression of GPx2-4 and catalase in GPx1-/-Hyp mice suggests gene redundancy within the model.
Collapse
Affiliation(s)
- Sheena Bouch
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia; and
| | - Megan O'Reilly
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia; and
| | - Judy B de Haan
- Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Richard Harding
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia; and
| | - Foula Sozo
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia; and
| |
Collapse
|
24
|
Nardiello C, Mižíková I, Morty RE. Looking ahead: where to next for animal models of bronchopulmonary dysplasia? Cell Tissue Res 2016; 367:457-468. [PMID: 27917436 PMCID: PMC5320021 DOI: 10.1007/s00441-016-2534-3] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 11/01/2016] [Indexed: 11/16/2022]
Abstract
Bronchopulmonary dysplasia (BPD) is the most common complication of preterm birth, with appreciable morbidity and mortality in a neonatal intensive care setting. Much interest has been shown in the identification of pathogenic pathways that are amenable to pharmacological manipulation (1) to facilitate the development of novel therapeutic and medical management strategies and (2) to identify the basic mechanisms of late lung development, which remains poorly understood. A number of animal models have therefore been developed and continue to be refined with the aim of recapitulating pathological pulmonary hallmarks noted in lungs from neonates with BPD. These animal models rely on several injurious stimuli, such as mechanical ventilation or oxygen toxicity and infection and sterile inflammation, as applied in mice, rats, rabbits, pigs, lambs and nonhuman primates. This review addresses recent developments in modeling BPD in experimental animals and highlights important neglected areas that demand attention. Additionally, recent progress in the quantitative microscopic analysis of pathology tissue is described, together with new in vitro approaches of value for the study of normal and aberrant alveolarization. The need to examine long-term sequelae of damage to the developing neonatal lung is also considered, as is the need to move beyond the study of the lungs alone in experimental animal models of BPD.
Collapse
Affiliation(s)
- Claudio Nardiello
- Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Parkstrasse 1, 61231, Bad Nauheim, Germany.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany
| | - Ivana Mižíková
- Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Parkstrasse 1, 61231, Bad Nauheim, Germany.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany
| | - Rory E Morty
- Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Parkstrasse 1, 61231, Bad Nauheim, Germany. .,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany.
| |
Collapse
|
25
|
Prakash YS. Emerging concepts in smooth muscle contributions to airway structure and function: implications for health and disease. Am J Physiol Lung Cell Mol Physiol 2016; 311:L1113-L1140. [PMID: 27742732 DOI: 10.1152/ajplung.00370.2016] [Citation(s) in RCA: 99] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 10/06/2016] [Indexed: 12/15/2022] Open
Abstract
Airway structure and function are key aspects of normal lung development, growth, and aging, as well as of lung responses to the environment and the pathophysiology of important diseases such as asthma, chronic obstructive pulmonary disease, and fibrosis. In this regard, the contributions of airway smooth muscle (ASM) are both functional, in the context of airway contractility and relaxation, as well as synthetic, involving production and modulation of extracellular components, modulation of the local immune environment, cellular contribution to airway structure, and, finally, interactions with other airway cell types such as epithelium, fibroblasts, and nerves. These ASM contributions are now found to be critical in airway hyperresponsiveness and remodeling that occur in lung diseases. This review emphasizes established and recent discoveries that underline the central role of ASM and sets the stage for future research toward understanding how ASM plays a central role by being both upstream and downstream in the many interactive processes that determine airway structure and function in health and disease.
Collapse
Affiliation(s)
- Y S Prakash
- Departments of Anesthesiology, and Physiology & Biomedical Engineering, Mayo Clinic, Rochester, Minnesota
| |
Collapse
|
26
|
Couroucli XI, Placencia JL, Cates LA, Suresh GK. Should we still use vitamin A to prevent bronchopulmonary dysplasia? J Perinatol 2016; 36:581-5. [PMID: 27228508 DOI: 10.1038/jp.2016.76] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 03/07/2016] [Accepted: 04/01/2016] [Indexed: 12/28/2022]
Abstract
Bronchopulmonary dysplasia (BPD) is associated with significant short- and long-term morbidity in preterm infants, and it can be prevented in some infants with vitamin A prophylaxis. Vitamin A, once widely used in neonatal intensive care, was scarce for the last few years, but has become available again at a much higher price, leading to dilemmas about its routine use. In this review we discuss experimental, clinical and socioeconomic evidence related to BPD, and provide a framework for clinicians and policy-makers to evaluate the value of vitamin A treatment and make decisions about its use for prevention of BPD.
Collapse
Affiliation(s)
- X I Couroucli
- Department of Pediatrics, Section of Neonatology, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, USA
| | - J L Placencia
- Department of Pediatrics, Section of Neonatology, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, USA
| | - L A Cates
- Department of Pediatrics, Section of Neonatology, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, USA
| | - G K Suresh
- Department of Pediatrics, Section of Neonatology, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, USA
| |
Collapse
|
27
|
Bouch S, Harding R, O’Reilly M, Wood LG, Sozo F. Impact of Dietary Tomato Juice on Changes in Pulmonary Oxidative Stress, Inflammation and Structure Induced by Neonatal Hyperoxia in Mice (Mus musculus). PLoS One 2016; 11:e0159633. [PMID: 27438045 PMCID: PMC4954692 DOI: 10.1371/journal.pone.0159633] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 07/06/2016] [Indexed: 02/07/2023] Open
Abstract
Many preterm infants require hyperoxic gas for survival, although it can contribute to lung injury. Experimentally, neonatal hyperoxia leads to persistent alterations in lung structure and increases leukocytes in bronchoalveolar lavage fluid (BALF). These effects of hyperoxia on the lungs are considered to be caused, at least in part, by increased oxidative stress. Our objective was to determine if dietary supplementation with a known source of antioxidants (tomato juice, TJ) could protect the developing lung from injury caused by breathing hyperoxic gas. Neonatal mice (C57BL6/J) breathed either 65% O2 (hyperoxia) or room air from birth until postnatal day 7 (P7d); some underwent necropsy at P7d and others were raised in room air until adulthood (P56d). In subsets of both groups, drinking water was replaced with TJ (diluted 50:50 in water) from late gestation to necropsy. At P7d and P56d, we analyzed total antioxidant capacity (TAC), markers of oxidative stress (nitrotyrosine and heme oxygenase-1 expression), inflammation (interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) expression), collagen (COL) and smooth muscle in the lungs; we also assessed lung structure. We quantified macrophages in lung tissue (at P7d) and leukocytes in BALF (at P56d). At P7d, TJ increased pulmonary TAC and COL1α1 expression and attenuated the hyperoxia-induced increase in nitrotyrosine and macrophage influx; however, changes in lung structure were not affected. At P56d, TJ increased TAC, decreased oxidative stress and reversed the hyperoxia-induced increase in bronchiolar smooth muscle. Additionally, TJ alone decreased IL-1β expression, but following hyperoxia TJ increased TNF-α expression and did not alter the hyperoxia-induced increase in leukocyte number. We conclude that TJ supplementation during and after neonatal exposure to hyperoxia protects the lung from some but not all aspects of hyperoxia-induced injury, but may also have adverse side-effects. The effects of TJ are likely due to elevation of circulating antioxidant concentrations.
Collapse
Affiliation(s)
- Sheena Bouch
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
- * E-mail:
| | - Richard Harding
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
| | - Megan O’Reilly
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
| | - Lisa G. Wood
- Centre for Asthma and Respiratory Diseases, Hunter Medical Research Institute, The University of Newcastle, Newcastle, New South Wales, Australia
| | - Foula Sozo
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
| |
Collapse
|
28
|
Owusu SA, Ross AC. Retinoid Homeostatic Gene Expression in Liver, Lung and Kidney: Ontogeny and Response to Vitamin A-Retinoic Acid (VARA) Supplementation from Birth to Adult Age. PLoS One 2016; 11:e0145924. [PMID: 26731668 PMCID: PMC4701161 DOI: 10.1371/journal.pone.0145924] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 12/10/2015] [Indexed: 11/18/2022] Open
Abstract
Vitamin A (VA, retinol) metabolism is homeostatically controlled, but little is known of its regulation in the postnatal period. Here, we determined the postnatal trajectory of VA storage and metabolism in major compartments of VA metabolism-plasma, liver, lung, and kidney from postnatal (P) day 1 to adulthood. We also investigated the response to supplementation with VARA, a combination of VA and 10% all-trans-retinoic acid that previously was shown to synergistically increase retinol uptake and storage in lung. Nursling pups of dams fed a VA-marginal diet received an oral dose of oil (placebo) or VARA on each of four neonatal days: P1, P4, P7, and P10; and again as adults. Tissues were collected 6 h after the final dosing on P1, P4, P10, and at adult age. Gene transcripts for Lrat and Rbp4 in liver and Raldh-1 and Raldh-3 in lung, did not differ in the neonatal period but were higher, P<0.05, in adults, while Cyp26B1, Stra6, megalin, and Raldh-2 in lung did not differ from perinatal to adult ages. VARA supplementation increased total retinol in plasma, liver and lung, with a dose-by-dose accumulation in neonatal liver and lung, while transcripts for Lrat in liver, megalin in kidney, Cyp26A1/B1 in liver and lung, respectively, and Stra6 in lung, were all increased, suggesting pathways of VA uptake, storage and RA oxidation were each augmented after VARA. VARA decreased hepatic expression of Rbp4, responsible for VA trafficking from liver to plasma, and, in lung, of Raldh-1 and Raldh-2, which function in RA production. Our results define retinoid homeostatic gene expression from neonatal and adult age and show that while supplementation with VARA acutely alters retinol content and retinoid homeostatic gene expression in neonatal and adult lung, liver and kidney, VARA supplementation of neonates increased adult-age VA content only in the liver.
Collapse
Affiliation(s)
- Sarah A Owusu
- Graduate Program in Physiology, The Pennsylvania State University, University Park, Pennsylvania, United States of America.,Department of Nutritional Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - A Catharine Ross
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America.,Center for Molecular and Cellular Immunology, Huck Institute for the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| |
Collapse
|
29
|
Olave N, Lal CV, Halloran B, Pandit K, Cuna AC, Faye-Petersen OM, Kelly DR, Nicola T, Benos PV, Kaminski N, Ambalavanan N. Regulation of alveolar septation by microRNA-489. Am J Physiol Lung Cell Mol Physiol 2015; 310:L476-87. [PMID: 26719145 DOI: 10.1152/ajplung.00145.2015] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 12/26/2015] [Indexed: 12/16/2022] Open
Abstract
MicroRNAs (miRs) are small conserved RNA that regulate gene expression. Bioinformatic analysis of miRNA profiles during mouse lung development indicated a role for multiple miRNA, including miRNA-489. miR-489 increased on completion of alveolar septation [postnatal day 42 (P42)], associated with decreases in its conserved target genes insulin-like growth factor-1 (Igf1) and tenascin C (Tnc). We hypothesized that dysregulation of miR-489 and its target genes Igf1 and Tnc contribute to hyperoxia-induced abnormal lung development. C57BL/6 mice were exposed to normoxia (21%) or hyperoxia (85% O2) from P4 to P14, in combination with intranasal locked nucleic acid against miR-489 to inhibit miR-489, cytomegalovirus promoter (pCMV)-miR-489 to overexpress miR-489, or empty vector. Hyperoxia reduced miR-489 and increased Igf1 and Tnc. Locked nucleic acid against miR-489 improved lung development during hyperoxia and did not alter it during normoxia, whereas miR-489 overexpression inhibited lung development during normoxia. The 3' untranslated region in vitro reporter studies confirmed Igf1 and Tnc as targets of miR-489. While miR-489 was of epithelial origin and present in exosomes, its targets Igf1 and Tnc were produced by fibroblasts. Infants with bronchopulmonary dysplasia (BPD) had reduced lung miR-489 and increased Igf1 and Tnc compared with normal preterm or term infants. These results suggest increased miR-489 is an inhibitor of alveolar septation. During hyperoxia or BPD, reduced miR-489 and increased Igf1 and Tnc may be inadequate attempts at compensation. Further inhibition of miR-489 may permit alveolar septation to proceed. The use of specific miRNA antagonists or agonists may be a therapeutic strategy for inhibited alveolarization, such as in BPD.
Collapse
Affiliation(s)
- Nelida Olave
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Charitharth V Lal
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Brian Halloran
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Kusum Pandit
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Alain C Cuna
- Department of Pediatrics, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri
| | - Ona M Faye-Petersen
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama
| | - David R Kelly
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Teodora Nicola
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Panayiotis V Benos
- Department of Computational & Systems Biology, University of Pittsburgh, Pittsburgh, Pennsylvania; and
| | - Naftali Kaminski
- Division of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, Connecticut
| | - Namasivayam Ambalavanan
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama; Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama;
| |
Collapse
|
30
|
Balany J, Bhandari V. Understanding the Impact of Infection, Inflammation, and Their Persistence in the Pathogenesis of Bronchopulmonary Dysplasia. Front Med (Lausanne) 2015; 2:90. [PMID: 26734611 PMCID: PMC4685088 DOI: 10.3389/fmed.2015.00090] [Citation(s) in RCA: 111] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 12/03/2015] [Indexed: 12/11/2022] Open
Abstract
The concerted interaction of genetic and environmental factors acts on the preterm human immature lung with inflammation being the common denominator leading to the multifactorial origin of the most common chronic lung disease in infants – bronchopulmonary dysplasia (BPD). Adverse perinatal exposure to infection/inflammation with added insults like invasive mecha nical ventilation, exposure to hyperoxia, and sepsis causes persistent immune dysregulation. In this review article, we have attempted to analyze and consolidate current knowledge about the role played by persistent prenatal and postnatal inflammation in the pathogenesis of BPD. While some parameters of the early inflammatory response (neutrophils, cytokines, etc.) may not be detectable after days to weeks of exposure to noxious stimuli, they have already initiated the signaling pathways of the inflammatory process/immune cascade and have affected permanent defects structurally and functionally in the BPD lungs. Hence, translational research aimed at prevention/amelioration of BPD needs to focus on dampening the inflammatory response at an early stage to prevent the cascade of events leading to lung injury with impaired healing resulting in the pathologic pulmonary phenotype of alveolar simplification and dysregulated vascularization characteristic of BPD.
Collapse
Affiliation(s)
- Jherna Balany
- Section of Neonatology, Department of Pediatrics, St. Christopher's Hospital for Children, Drexel University College of Medicine , Philadelphia, PA , USA
| | - Vineet Bhandari
- Section of Neonatology, Department of Pediatrics, St. Christopher's Hospital for Children, Drexel University College of Medicine , Philadelphia, PA , USA
| |
Collapse
|
31
|
Yun EJ, Lorizio W, Seedorf G, Abman SH, Vu TH. VEGF and endothelium-derived retinoic acid regulate lung vascular and alveolar development. Am J Physiol Lung Cell Mol Physiol 2015; 310:L287-98. [PMID: 26566904 DOI: 10.1152/ajplung.00229.2015] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 11/04/2015] [Indexed: 12/24/2022] Open
Abstract
Prevention or treatment of lung diseases caused by the failure to form, or destruction of, existing alveoli, as observed in infants with bronchopulmonary dysplasia and adults with emphysema, requires understanding of the molecular mechanisms of alveolar development. In addition to its critical role in gas exchange, the pulmonary circulation also contributes to alveolar morphogenesis and maintenance by the production of paracrine factors, termed "angiocrines," that impact the development of surrounding tissue. To identify lung angiocrines that contribute to alveolar formation, we disrupted pulmonary vascular development by conditional inactivation of the Vegf-A gene during alveologenesis. This resulted in decreased pulmonary capillary and alveolar development and altered lung elastin and retinoic acid (RA) expression. We determined that RA is produced by pulmonary endothelial cells and regulates pulmonary angiogenesis and elastin synthesis by induction of VEGF-A and fibroblast growth factor (FGF)-18, respectively. Inhibition of RA synthesis in newborn mice decreased FGF-18 and elastin expression and impaired alveolarization. Treatment with RA and vitamin A partially reversed the impaired vascular and alveolar development induced by VEGF inhibition. Thus we identified RA as a lung angiocrine that regulates alveolarization through autocrine regulation of endothelial development and paracrine regulation of elastin synthesis via induction of FGF-18 in mesenchymal cells.
Collapse
Affiliation(s)
- Eun Jun Yun
- Department of Medicine, University of California, San Francisco, San Francisco, California; and
| | - Walter Lorizio
- Department of Medicine, University of California, San Francisco, San Francisco, California; and
| | - Gregory Seedorf
- Pediatric Heart Lung Center and Department of Pediatrics, University of Colorado Denver-Anschutz Medical Campus, Aurora, Colorado
| | - Steven H Abman
- Pediatric Heart Lung Center and Department of Pediatrics, University of Colorado Denver-Anschutz Medical Campus, Aurora, Colorado
| | - Thiennu H Vu
- Department of Medicine, University of California, San Francisco, San Francisco, California; and
| |
Collapse
|
32
|
Chen HJ, Chiang BL. Effect of Hyperoxia on Retinoid Metabolism and Retinoid Receptor Expression in the Lungs of Newborn Mice. PLoS One 2015; 10:e0140343. [PMID: 26509921 PMCID: PMC4624932 DOI: 10.1371/journal.pone.0140343] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Accepted: 09/24/2015] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Preterm newborns that receive oxygen therapy often develop bronchopulmonary dysplasia (BPD), which is abnormal lung development characterized by impaired alveologenesis. Oxygen-mediated injury is thought to disrupt normal lung growth and development. However, the mechanism of hyperoxia-induced BPD has not been extensively investigated. We established a neonatal mouse model to investigate the effects of normobaric hyperoxia on retinoid metabolism and retinoid receptor expression. METHODS Newborn mice were exposed to hyperoxic or normoxic conditions for 15 days. The concentration of retinol and retinyl palmitate in the lung was measured by HPLC to gauge retinoid metabolism. Retinoid receptor mRNA levels were assessed by real-time PCR. Proliferation and retinoid receptor expression in A549 cells were assessed in the presence and absence of exogenous vitamin A. RESULTS Hyperoxia significantly reduced the body and lung weight of neonatal mice. Hyperoxia also downregulated expression of RARα, RARγ, and RXRγ in the lungs of neonatal mice. In vitro, hyperoxia inhibited proliferation and expression of retinoid receptors in A549 cells. CONCLUSION Hyperoxia disrupted retinoid receptor expression in neonatal mice.
Collapse
Affiliation(s)
- Hsing-Jin Chen
- Graduate Institute of Clinical Medicine College of Medicine of National Taiwan University, Taipei, Taiwan
| | - Bor-Luen Chiang
- Graduate Institute of Immunology, National Taiwan University, Taipei, Taiwan
| |
Collapse
|
33
|
Silva DMG, Nardiello C, Pozarska A, Morty RE. Recent advances in the mechanisms of lung alveolarization and the pathogenesis of bronchopulmonary dysplasia. Am J Physiol Lung Cell Mol Physiol 2015; 309:L1239-72. [PMID: 26361876 DOI: 10.1152/ajplung.00268.2015] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 09/09/2015] [Indexed: 02/08/2023] Open
Abstract
Alveolarization is the process by which the alveoli, the principal gas exchange units of the lung, are formed. Along with the maturation of the pulmonary vasculature, alveolarization is the objective of late lung development. The terminal airspaces that were formed during early lung development are divided by the process of secondary septation, progressively generating an increasing number of alveoli that are of smaller size, which substantially increases the surface area over which gas exchange can take place. Disturbances to alveolarization occur in bronchopulmonary dysplasia (BPD), which can be complicated by perturbations to the pulmonary vasculature that are associated with the development of pulmonary hypertension. Disturbances to lung development may also occur in persistent pulmonary hypertension of the newborn in term newborn infants, as well as in patients with congenital diaphragmatic hernia. These disturbances can lead to the formation of lungs with fewer and larger alveoli and a dysmorphic pulmonary vasculature. Consequently, affected lungs exhibit a reduced capacity for gas exchange, with important implications for morbidity and mortality in the immediate postnatal period and respiratory health consequences that may persist into adulthood. It is the objective of this Perspectives article to update the reader about recent developments in our understanding of the molecular mechanisms of alveolarization and the pathogenesis of BPD.
Collapse
Affiliation(s)
- Diogo M G Silva
- Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany; Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Claudio Nardiello
- Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany; Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Agnieszka Pozarska
- Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany; Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Rory E Morty
- Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany; Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany
| |
Collapse
|
34
|
Lingappan K, Moorthy B. Can maternal DHA supplementation offer long-term protection against neonatal hyperoxic lung injury? Am J Physiol Lung Cell Mol Physiol 2015; 309:L1383-6. [PMID: 26361877 DOI: 10.1152/ajplung.00313.2015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 09/08/2015] [Indexed: 12/19/2022] Open
Abstract
The effect of adverse perinatal environment (like maternal infection) has long-standing effects on many organ systems, including the respiratory system. Use of maternal nutritional supplements is an exciting therapeutic option that could be used to protect the developing fetus. In a recent issue of the journal, Ali and associates (Ali M, Heyob KM, Velten M, Tipple TE, Rogers LK. Am J Physiol Lung Cell Mol Physiol 309: L441-L448, 2015) specifically look at maternal docosahexaenoic acid (DHA) supplementation and its effect on chronic apoptosis in the lung in a mouse model of perinatal inflammation and postnatal hyperoxia. Strikingly, the authors show that pulmonary apoptosis was augmented even 8 wk after the hyperoxia-exposed mice had been returned to room air. This effect was significantly attenuated in mice that were subjected to maternal dietary DHA supplementation. These findings are novel, significantly advance our understanding of chronic effects of adverse perinatal and neonatal events on the developing lung, and thereby offer novel therapeutic options in the form of maternal dietary supplementation with DHA. This editorial reviews the long-term effects of adverse perinatal environment on postnatal lung development and the protective effects of dietary supplements such as DHA.
Collapse
|
35
|
Nagato AC, Bezerra FS, Talvani A, Aarestrup BJ, Aarestrup FM. Hyperoxia promotes polarization of the immune response in ovalbumin-induced airway inflammation, leading to a TH17 cell phenotype. Immun Inflamm Dis 2015; 3:321-37. [PMID: 26417446 PMCID: PMC4578530 DOI: 10.1002/iid3.71] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 05/16/2015] [Accepted: 05/19/2015] [Indexed: 12/15/2022] Open
Abstract
Previous studies have demonstrated that hyperoxia-induced stress and oxidative damage to the lungs of mice lead to an increase in IL-6, TNF-α, and TGF-β expression. Together, IL-6 and TGF-β have been known to direct T cell differentiation toward the TH17 phenotype. In the current study, we tested the hypothesis that hyperoxia promotes the polarization of T cells to the TH17 cell phenotype in response to ovalbumin-induced acute airway inflammation. Airway inflammation was induced in female BALB/c mice by intraperitoneal sensitization and intranasal introduction of ovalbumin, followed by challenge methacholine. After the methacholine challenge, animals were exposed to hyperoxic conditions in an inhalation chamber for 24 h. The controls were subjected to normoxia or aluminum hydroxide dissolved in phosphate buffered saline. After 24 h of hyperoxia, the number of macrophages and lymphocytes decreased in animals with ovalbumin-induced airway inflammation, whereas the number of neutrophils increased after ovalbumin-induced airway inflammation. The results showed that expression of Nrf2, iNOS, T-bet and IL-17 increased after 24 of hyperoxia in both alveolar macrophages and in lung epithelial cells, compared with both animals that remained in room air, and animals with ovalbumin-induced airway inflammation. Hyperoxia alone without the induction of airway inflammation lead to increased levels of TNF-α and CCL5, whereas hyperoxia after inflammation lead to decreased CCL2 levels. Histological evidence of extravasation of inflammatory cells into the perivascular and peribronchial regions of the lungs was observed after pulmonary inflammation and hyperoxia. Hyperoxia promotes polarization of the immune response toward the TH17 phenotype, resulting in tissue damage associated with oxidative stress, and the migration of neutrophils to the lung and airways. Elucidating the effect of hyperoxia on ovalbumin-induced acute airway inflammation is relevant to preventing or treating asthmatic patients that require oxygen supplementation to reverse the hypoxemia.
Collapse
Affiliation(s)
- Akinori C Nagato
- Laboratory of Immunopathology and Experimental Pathology, Center for Reproductive Biology-CRB, Federal University of Juiz de Fora Juiz de Fora, Minas Gerais, Brazil
| | | | - André Talvani
- Laboratory of Immunobiology of Inflammation, Department of Biological Sciences (DECBI), Center of Research in Biological Sciences (NUPEB), Federal University of Ouro Preto (UFOP) Ouro Preto, Minas Gerais, Brazil
| | - Beatriz J Aarestrup
- Laboratory of Immunopathology and Experimental Pathology, Center for Reproductive Biology-CRB, Federal University of Juiz de Fora Juiz de Fora, Minas Gerais, Brazil
| | - Fernando M Aarestrup
- Laboratory of Immunopathology and Experimental Pathology, Center for Reproductive Biology-CRB, Federal University of Juiz de Fora Juiz de Fora, Minas Gerais, Brazil
| |
Collapse
|
36
|
Ozdemir R, Demirtas G, Parlakpinar H, Polat A, Tanbag K, Taslidere E, Karadag A. Dexpanthenol therapy reduces lung damage in a hyperoxic lung injury in neonatal rats. J Matern Fetal Neonatal Med 2015; 29:1801-7. [DOI: 10.3109/14767058.2015.1064104] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
37
|
Ramani M, Bradley WE, Dell'Italia LJ, Ambalavanan N. Early exposure to hyperoxia or hypoxia adversely impacts cardiopulmonary development. Am J Respir Cell Mol Biol 2015; 52:594-602. [PMID: 25255042 DOI: 10.1165/rcmb.2013-0491oc] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Preterm infants are at high risk for long-term abnormalities in cardiopulmonary function. Our objectives were to determine the long-term effects of hypoxia or hyperoxia on cardiopulmonary development and function in an immature animal model. Newborn C57BL/6 mice were exposed to air, hypoxia (12% oxygen), or hyperoxia (85% oxygen) from Postnatal Day 2-14, and then returned to air for 10 weeks (n = 2 litters per condition; > 10/group). Echocardiography, blood pressure, lung function, and lung development were evaluated at 12-14 weeks of age. Lungs from hyperoxia- or hypoxia-exposed mice were larger and more compliant (compliance: air, 0.034 ± 0.001 ml/cm H2O; hypoxia, 0.049 ± 0.002 ml/cm H2O; hyperoxia, 0.053 ± 0.002 ml/cm H2O; P < 0.001 air versus others). Increased airway reactivity, reduced bronchial M2 receptor staining, and increased bronchial α-smooth muscle actin content were noted in hyperoxia-exposed mice (maximal total lung resistance with methacholine: air, 1.89 ± 0.17 cm H2O ⋅ s/ml; hypoxia, 1.52 ± 0.34 cm H2O ⋅ s/ml; hyperoxia, 4.19 ± 0.77 cm H2O ⋅ s/ml; P < 0.004 air versus hyperoxia). Hyperoxia- or hypoxia-exposed mice had larger and fewer alveoli (mean linear intercept: air, 40.2 ± 0. 0.8 μm; hypoxia, 76.4 ± 2.4 μm; hyperoxia, 95.6 ± 4.6 μm; P < 0.001 air versus others; radial alveolar count [n]: air, 11.1 ± 0.4; hypoxia, 5.7 ± 0.3; hyperoxia, 5.6 ± 0.3; P < 0.001 air versus others). Hyperoxia-exposed adult mice had left ventricular dysfunction without systemic hypertension. In conclusion, exposure of newborn mice to hyperoxia or hypoxia leads to cardiopulmonary abnormalities in adult life, similar to that described in ex-preterm infants. This animal model may help to identify underlying mechanisms and to develop therapeutic strategies for pulmonary morbidity in former preterm infants.
Collapse
|
38
|
Ambalavanan N, Cotten CM, Page GP, Carlo WA, Murray JC, Bhattacharya S, Mariani TJ, Cuna AC, Faye-Petersen OM, Kelly D, Higgins RD. Integrated genomic analyses in bronchopulmonary dysplasia. J Pediatr 2015; 166:531-7.e13. [PMID: 25449221 PMCID: PMC4344889 DOI: 10.1016/j.jpeds.2014.09.052] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2014] [Revised: 08/18/2014] [Accepted: 09/26/2014] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To identify single-nucleotide polymorphisms (SNPs) and pathways associated with bronchopulmonary dysplasia (BPD) because O2 requirement at 36 weeks' postmenstrual age risk is strongly influenced by heritable factors. STUDY DESIGN A genome-wide scan was conducted on 1.2 million genotyped SNPs, and an additional 7 million imputed SNPs, using a DNA repository of extremely low birth weight infants. Genome-wide association and gene set analysis was performed for BPD or death, severe BPD or death, and severe BPD in survivors. Specific targets were validated via the use of gene expression in BPD lung tissue and in mouse models. RESULTS Of 751 infants analyzed, 428 developed BPD or died. No SNPs achieved genome-wide significance (P < 10(-8)), although multiple SNPs in adenosine deaminase, CD44, and other genes were just below P < 10(-6). Of approximately 8000 pathways, 75 were significant at false discovery rate (FDR) <0.1 and P < .001 for BPD/death, 95 for severe BPD/death, and 90 for severe BPD in survivors. The pathway with lowest FDR was miR-219 targets (P = 1.41E-08, FDR 9.5E-05) for BPD/death and phosphorous oxygen lyase activity (includes adenylate and guanylate cyclases) for both severe BPD/death (P = 5.68E-08, FDR 0.00019) and severe BPD in survivors (P = 3.91E-08, FDR 0.00013). Gene expression analysis confirmed significantly increased miR-219 and CD44 in BPD. CONCLUSIONS Pathway analyses confirmed involvement of known pathways of lung development and repair (CD44, phosphorus oxygen lyase activity) and indicated novel molecules and pathways (adenosine deaminase, targets of miR-219) involved in genetic predisposition to BPD.
Collapse
Affiliation(s)
| | | | | | - Waldemar A Carlo
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL
| | | | - Soumyaroop Bhattacharya
- Division of Neonatology and Program in Pediatric Molecular and Personalized Medicine, University of Rochester, Rochester, NY
| | - Thomas J Mariani
- Division of Neonatology and Program in Pediatric Molecular and Personalized Medicine, University of Rochester, Rochester, NY
| | - Alain C Cuna
- Department of Pediatrics, University of Missouri-Kansas City School of Medicine, Kansas City, MO
| | - Ona M Faye-Petersen
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL
| | - David Kelly
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL
| | - Rosemary D Higgins
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD
| |
Collapse
|
39
|
Barber T, Esteban-Pretel G, Marín MP, Timoneda J. Vitamin a deficiency and alterations in the extracellular matrix. Nutrients 2014; 6:4984-5017. [PMID: 25389900 PMCID: PMC4245576 DOI: 10.3390/nu6114984] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 09/26/2014] [Accepted: 10/20/2014] [Indexed: 12/13/2022] Open
Abstract
Vitamin A or retinol which is the natural precursor of several biologically active metabolites can be considered the most multifunctional vitamin in mammals. Its deficiency is currently, along with protein malnutrition, the most serious and common nutritional disorder worldwide. It is necessary for normal embryonic development and postnatal tissue homeostasis, and exerts important effects on cell proliferation, differentiation and apoptosis. These actions are produced mainly by regulating the expression of a variety of proteins through transcriptional and non-transcriptional mechanisms. Extracellular matrix proteins are among those whose synthesis is known to be modulated by vitamin A. Retinoic acid, the main biologically active form of vitamin A, influences the expression of collagens, laminins, entactin, fibronectin, elastin and proteoglycans, which are the major components of the extracellular matrix. Consequently, the structure and macromolecular composition of this extracellular compartment is profoundly altered as a result of vitamin A deficiency. As cell behavior, differentiation and apoptosis, and tissue mechanics are influenced by the extracellular matrix, its modifications potentially compromise organ function and may lead to disease. This review focuses on the effects of lack of vitamin A in the extracellular matrix of several organs and discusses possible molecular mechanisms and pathologic implications.
Collapse
Affiliation(s)
- Teresa Barber
- Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universitat de Valencia, Avda V. Andrés Estellés s/n, 46100-Burjassot, Spain.
| | - Guillermo Esteban-Pretel
- Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universitat de Valencia, Avda V. Andrés Estellés s/n, 46100-Burjassot, Spain.
| | - María Pilar Marín
- Unidad de Microscopía IIS La Fe Valencia, Avda Campanar, 21, 46009-Valencia, Spain.
| | - Joaquín Timoneda
- Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universitat de Valencia, Avda V. Andrés Estellés s/n, 46100-Burjassot, Spain.
| |
Collapse
|
40
|
Berger J, Bhandari V. Animal models of bronchopulmonary dysplasia. The term mouse models. Am J Physiol Lung Cell Mol Physiol 2014; 307:L936-47. [PMID: 25305249 DOI: 10.1152/ajplung.00159.2014] [Citation(s) in RCA: 186] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The etiology of bronchopulmonary dysplasia (BPD) is multifactorial, with genetics, ante- and postnatal sepsis, invasive mechanical ventilation, and exposure to hyperoxia being well described as contributing factors. Much of what is known about the pathogenesis of BPD is derived from animal models being exposed to the environmental factors noted above. This review will briefly cover the various mouse models of BPD, focusing mainly on the hyperoxia-induced lung injury models. We will also include hypoxia, hypoxia/hyperoxia, inflammation-induced, and transgenic models in room air. Attention to the stage of lung development at the timing of the initiation of the environmental insult and the duration of lung injury is critical to attempt to mimic the human disease pulmonary phenotype, both in the short term and in outcomes extending into childhood, adolescence, and adulthood. The various indexes of alveolar and vascular development as well as pulmonary function including pulmonary hypertension will be highlighted. The advantages (and limitations) of using such approaches will be discussed in the context of understanding the pathogenesis of and targeting therapeutic interventions to ameliorate human BPD.
Collapse
Affiliation(s)
- Jessica Berger
- Division of Perinatal Medicine, Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut
| | - Vineet Bhandari
- Division of Perinatal Medicine, Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut
| |
Collapse
|
41
|
Carotenoids, inflammation, and oxidative stress--implications of cellular signaling pathways and relation to chronic disease prevention. Nutr Res 2014; 34:907-29. [PMID: 25134454 DOI: 10.1016/j.nutres.2014.07.010] [Citation(s) in RCA: 390] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 06/24/2014] [Accepted: 07/14/2014] [Indexed: 12/31/2022]
Abstract
Several epidemiologic studies have shown that diets rich in fruits and vegetables reduce the risk of developing several chronic diseases, such as type 2 diabetes, atherosclerosis, and cancer. These diseases are linked with systemic, low-grade chronic inflammation. Although controversy persists on the bioactive ingredients, several secondary plant metabolites have been associated with these beneficial health effects. Carotenoids represent the most abundant lipid-soluble phytochemicals, and in vitro and in vivo studies have suggested that they have antioxidant, antiapoptotic, and anti-inflammatory properties. Recently, many of these properties have been linked to the effect of carotenoids on intracellular signaling cascades, thereby influencing gene expression and protein translation. By blocking the translocation of nuclear factor κB to the nucleus, carotenoids are able to interact with the nuclear factor κB pathway and thus inhibit the downstream production of inflammatory cytokines, such as interleukin-8 or prostaglandin E2. Carotenoids can also block oxidative stress by interacting with the nuclear factor erythroid 2-related factor 2 pathway, enhancing its translocation into the nucleus, and activating phase II enzymes and antioxidants, such as glutathione-S-transferases. In this review, which is organized into in vitro, animal, and human investigations, we summarized current knowledge on carotenoids and metabolites with respect to their ability to modulate inflammatory and oxidative stress pathways and discuss potential dose-health relations. Although many pathways involved in the bioactivity of carotenoids have been revealed, future research should be directed toward dose-response relations of carotenoids, their metabolites, and their effect on transcription factors and metabolism.
Collapse
|
42
|
|
43
|
Bhandari V. Postnatal inflammation in the pathogenesis of bronchopulmonary dysplasia. ACTA ACUST UNITED AC 2014; 100:189-201. [PMID: 24578018 DOI: 10.1002/bdra.23220] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 01/02/2014] [Accepted: 01/05/2014] [Indexed: 12/18/2022]
Abstract
Exposure to hyperoxia, invasive mechanical ventilation, and systemic/local sepsis are important antecedents of postnatal inflammation in the pathogenesis of bronchopulmonary dysplasia (BPD). This review will summarize information obtained from animal (baboon, lamb/sheep, rat and mouse) models that pertain to the specific inflammatory agents and signaling molecules that predispose a premature infant to BPD.
Collapse
Affiliation(s)
- Vineet Bhandari
- Division of Perinatal Medicine, Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut
| |
Collapse
|
44
|
Wu L, Zolfaghari R, Ross AC. Acidic retinoids in small amounts promote retinyl ester formation in neonatal lung, with transient increases in retinoid homeostatic gene expression. Nutr Metab (Lond) 2013; 10:72. [PMID: 24351038 PMCID: PMC3878245 DOI: 10.1186/1743-7075-10-72] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Accepted: 12/17/2013] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Mixing a small proportion, 10%, of retinoic acid (RA) into an oral dose of vitamin A (VA) has been shown to markedly increase retinol uptake and retinyl ester (RE) formation in the neonatal lung, as compared to VA given alone. Concomitantly, several retinoid homeostatic genes, lecithin:retinol acyltransferase (LRAT), RA-4-hydroxylase (CYP26B1), and stimulated by retinoic acid gene-6 (STRA6) were upregulated. However, whether multiple doses may act accumulatively and whether less than 10% RA can be used has not been determined. METHODS Neonatal rats were treated once on postnatal day (PD) 4 or PD14 with VA alone or VA combined with 10% RA (VARA10%) or a stable analog, Am580 (VAAm10%), or they were treated with multiple doses on PD4, 7, 11, and 14. RESULTS RE increased cumulatively with multiple dosing. However, LRAT, CYP26B1 and STRA6 mRNA levels were similar for single and multiple treatments, indicating a transient noncumulative impact on gene expression. Lung RE was elevated with as little as 0.5% RA (P < 0.05) in a single dosing study. Whereas all concentrations of VARA elevated lung RE in single dosing studies, only 10% RA increased lung RE after multiple dosing, suggesting an attenuation of RA action with repeated dosing. In contrast, VAAm10%, 2%, and 1% all significantly increased lung RE after multiple doses (P < 0.05), while also increasing the expression of LRAT and CYP26B1. CONCLUSIONS These results indicate that the neonatal lung is very sensitive to acidic retinoid exposure and suggest that a VA combined with a very small fraction of acidic retinoid could be effective in increasing the lung's storage pool of VA.
Collapse
Affiliation(s)
- Lili Wu
- Department of Nutritional Sciences, 110 Chandlee Laboratory, Pennsylvania State University, 16802 University Park, PA, USA
| | - Reza Zolfaghari
- Department of Nutritional Sciences, 110 Chandlee Laboratory, Pennsylvania State University, 16802 University Park, PA, USA
| | - A Catharine Ross
- Department of Nutritional Sciences, 110 Chandlee Laboratory, Pennsylvania State University, 16802 University Park, PA, USA
- Department of Nutritional Sciences, Pennsylvania State University, 16802 University Park, PA, USA
| |
Collapse
|