1
|
Xu HN, Gonzalves D, Hoffman JH, Baur JA, Li LZ, Jensen EA. Use of Optical Redox Imaging to Quantify Alveolar Macrophage Redox State in Infants: Proof of Concept Experiments in a Murine Model and Human Tracheal Aspirates Samples. Antioxidants (Basel) 2024; 13:546. [PMID: 38790651 PMCID: PMC11117937 DOI: 10.3390/antiox13050546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 04/14/2024] [Accepted: 04/24/2024] [Indexed: 05/26/2024] Open
Abstract
Emerging data indicate that lung macrophages (LM) may provide a novel biomarker to classify disease endotypes in bronchopulmonary dysplasia (BPD), a form of infant chronic lung disease, and that augmentation of the LM phenotype may be a potential therapeutic target. To contribute to this area of research, we first used Optical Redox Imaging (ORI) to characterize the responses to H2O2-induced oxidative stress and caffeine treatment in an in vitro model of mouse alveolar macrophages (AM). H2O2 caused a dose-dependent decrease in NADH and an increase in FAD-containing flavoproteins (Fp) and the redox ratio Fp/(NADH + Fp). Caffeine treatment did not affect Fp but significantly decreased NADH with doses of ≥50 µM, and 1000 µM caffeine treatment significantly increased the redox ratio and decreased the baseline level of mitochondrial ROS (reactive oxygen species). However, regardless of whether AM were pretreated with caffeine or not, the mitochondrial ROS levels increased to similar levels after H2O2 challenge. We then investigated the feasibility of utilizing ORI to examine macrophage redox status in tracheal aspirate (TA) samples obtained from premature infants receiving invasive ventilation. We observed significant heterogeneity in NADH, Fp, Fp/(NADH + Fp), and mitochondrial ROS of the TA macrophages. We found a possible positive correlation between gestational age and NADH and a negative correlation between mean airway pressure and NADH that provides hypotheses for future testing. Our study demonstrates that ORI is a feasible technique to characterize macrophage redox state in infant TA samples and supports further use of this method to investigate lung macrophage-mediated disease endotypes in BPD.
Collapse
Affiliation(s)
- He N. Xu
- Britton Chance Laboratory of Redox Imaging, Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (J.H.H.); (L.Z.L.)
| | - Diego Gonzalves
- Department of Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA;
| | - Jonathan H. Hoffman
- Britton Chance Laboratory of Redox Imaging, Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (J.H.H.); (L.Z.L.)
| | - Joseph A. Baur
- Department of Physiology, and Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA;
| | - Lin Z. Li
- Britton Chance Laboratory of Redox Imaging, Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (J.H.H.); (L.Z.L.)
| | - Erik A. Jensen
- Department of Pediatrics, Children’s Hospital of Philadelphia and Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA;
| |
Collapse
|
2
|
Grimm SL, Reddick S, Dong X, Leek C, Wang AX, Gutierrez MC, Hartig SM, Moorthy B, Coarfa C, Lingappan K. Loss of microRNA-30a and sex-specific effects on the neonatal hyperoxic lung injury. Biol Sex Differ 2023; 14:50. [PMID: 37553579 PMCID: PMC10408139 DOI: 10.1186/s13293-023-00535-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 07/24/2023] [Indexed: 08/10/2023] Open
Abstract
BACKGROUND Bronchopulmonary dysplasia (BPD) is characterized by an arrest in lung development and is a leading cause of morbidity in premature neonates. It has been well documented that BPD disproportionally affects males compared to females, but the molecular mechanisms behind this sex-dependent bias remain unclear. Female mice show greater preservation of alveolarization and angiogenesis when exposed to hyperoxia, accompanied by increased miR-30a expression. In this investigation, we tested the hypothesis that loss of miR-30a would result in male and female mice experiencing similar impairments in alveolarization and angiogenesis under hyperoxic conditions. METHODS Wild-type and miR-30a-/- neonatal mice were exposed to hyperoxia [95% FiO2, postnatal day [PND1-5] or room air before being euthanized on PND21. Alveolarization, pulmonary microvascular development, differences in lung transcriptome, and miR-30a expression were assessed in lungs from WT and miR-30a-/- mice of either sex. Blood transcriptomic signatures from preterm newborns (with and without BPD) were correlated with WT and miR-30a-/- male and female lung transcriptome data. RESULTS Significantly, the sex-specific differences observed in WT mice were abrogated in the miR-30a-/- mice upon exposure to hyperoxia. The loss of miR-30a expression eliminated the protective effect in females, suggesting that miR-30a plays an essential role in regulating alveolarization and angiogenesis. Transcriptome analysis by whole lung RNA-Seq revealed a significant response in the miR-30a-/- female hyperoxia-exposed lung, with enrichment of pathways related to cell cycle and neuroactive ligand-receptor interaction. Gene expression signature in the miR-30a-/- female lung associated with human BPD blood transcriptomes. Finally, we showed the spatial localization of miR-30a transcripts in the bronchiolar epithelium. CONCLUSIONS miR-30a could be one of the biological factors mediating the resilience of the female preterm lung to neonatal hyperoxic lung injury. A better understanding of the effects of miR-30a on pulmonary angiogenesis and alveolarization may lead to novel therapeutics for treating BPD.
Collapse
Affiliation(s)
- Sandra L Grimm
- Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX, USA
- Molecular and Cellular Biology Department, Baylor College of Medicine, Houston, TX, USA
| | - Samuel Reddick
- Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Xiaoyu Dong
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Connor Leek
- Department of Pediatrics, Division of Neonatology, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA, USA
| | - Amy Xiao Wang
- Department of Pediatrics, Division of Neonatology, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA, USA
| | - Manuel Cantu Gutierrez
- Department of Pediatrics, Division of Neonatology, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA, USA
| | - Sean M Hartig
- Molecular and Cellular Biology Department, Baylor College of Medicine, Houston, TX, USA
- Department of Medicine, Division of Endocrinology, Baylor College of Medicine, Houston, TX, USA
| | | | - Cristian Coarfa
- Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA.
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX, USA.
- Molecular and Cellular Biology Department, Baylor College of Medicine, Houston, TX, USA.
| | - Krithika Lingappan
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.
- Department of Pediatrics, Division of Neonatology, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA, USA.
| |
Collapse
|
3
|
Ransom MA, Bunn KE, Negretti NM, Jetter CS, Bressman ZJ, Sucre JMS, Pua HH. Developmental trajectory of extracellular vesicle characteristics from the lungs of preterm infants. Am J Physiol Lung Cell Mol Physiol 2023; 324:L385-L392. [PMID: 36719083 PMCID: PMC10026990 DOI: 10.1152/ajplung.00389.2022] [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: 11/23/2022] [Revised: 01/23/2023] [Accepted: 01/24/2023] [Indexed: 02/01/2023] Open
Abstract
Extracellular vesicles (EVs) are secreted lipid-enclosed particles that have emerged as potential biomarkers and therapeutic agents in lung disease, including bronchopulmonary dysplasia (BPD), a leading complication of preterm birth. Many unanswered questions remain about the content and cargo of EVs in premature infants and their role in lung development. To characterize EVs during human lung development, tracheal aspirates were collected from premature neonates between 22 and 35 wk gestational age and analyzed via nanoparticle tracking analysis, electron microscopy, and bead-based flow cytometry. EVs were detectable across late canalicular through saccular stages of lung development, demonstrating larger sizes earlier in gestation. EVs contained an abundance of the EV-enriched tetraspanins CD9, CD63, and CD81, as well as epithelial cell and immune cell markers. Increases in select surface proteins (CD24 and CD14) on EVs were associated with gestational age and with the risk of BPD. Finally, query of expression data obtained from epithelial cells in a single-cell atlas of murine lung development found that epithelial EV marker expression also changes with developmental time. Together, these data demonstrate an association between EV profile and lung development and provide a foundation for future functional classification of EVs, with the goal of determining their role in cell signaling during development and harnessing their potential as a new therapeutic target in BPD.
Collapse
Affiliation(s)
- Meaghan A Ransom
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Kaitlyn E Bunn
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Nicholas M Negretti
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Christopher S Jetter
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Zachary J Bressman
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, United States
| | - Jennifer M S Sucre
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, United States
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee, United States
| | - Heather H Pua
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, United States
- Vanderbilt Center for Immunobiology, Vanderbilt University Medical Center, Nashville, Tennessee, United States
| |
Collapse
|
4
|
Putting the "mi" in omics: discovering miRNA biomarkers for pediatric precision care. Pediatr Res 2023; 93:316-323. [PMID: 35906312 PMCID: PMC9884316 DOI: 10.1038/s41390-022-02206-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Accepted: 06/27/2022] [Indexed: 01/31/2023]
Abstract
In the past decade, growing interest in micro-ribonucleic acids (miRNAs) has catapulted these small, non-coding nucleic acids to the forefront of biomarker research. Advances in scientific knowledge have made it clear that miRNAs play a vital role in regulating cellular physiology throughout the human body. Perturbations in miRNA signaling have also been described in a variety of pediatric conditions-from cancer, to renal failure, to traumatic brain injury. Likewise, the number of studies across pediatric disciplines that pair patient miRNA-omics with longitudinal clinical data are growing. Analyses of these voluminous, multivariate data sets require understanding of pediatric phenotypic data, data science, and genomics. Use of machine learning techniques to aid in biomarker detection have helped decipher background noise from biologically meaningful changes in the data. Further, emerging research suggests that miRNAs may have potential as therapeutic targets for pediatric precision care. Here, we review current miRNA biomarkers of pediatric diseases and studies that have combined machine learning techniques, miRNA-omics, and patient health data to identify novel biomarkers and potential therapeutics for pediatric diseases. IMPACT: In the following review article, we summarized how recent developments in microRNA research may be coupled with machine learning techniques to advance pediatric precision care.
Collapse
|
5
|
Zhang Y, Kong X, Zhang J, Wang X. Functional Analysis of Bronchopulmonary Dysplasia-Related Neuropeptides in Preterm Infants and miRNA-Based Diagnostic Model Construction. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2022; 2022:5682599. [PMID: 35509863 PMCID: PMC9061009 DOI: 10.1155/2022/5682599] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 12/17/2021] [Accepted: 12/20/2021] [Indexed: 12/17/2022]
Abstract
Background Bronchopulmonary dysplasia (BPD) has a high mortality rate. This study was aimed at identifying and analysing the risk factors associated with BPD using bioinformatic and mechanical analyses and establishing a predictive model to assess the risk of BPD in preterm infants. Methods We identified differentially expressed RNAs via the intersection of miRNAs between datasets. Online analysis tools were used to predict genes targeted by differentially expressed miRNAs (DEmiRNAs) and to generate and visualise competing endogenous RNA (ceRNA) coexpression networks. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses were subsequently performed on the DEmiRNAs. In addition, an intersection analysis was performed on mRNA and neuropeptide-related genes in the ceRNA network. DEmiRNAs associated with BPD and those involved in ceRNA networks were used to establish a diagnostic prediction model. The GSE108604 dataset was used as a validation set to verify the model. Results A total of 26 DEmiRNAs were identified from the tracheal aspirates (TAs) of patients with BPD and healthy controls. In addition, a total of 1076 DEmRNAs were obtained from the GSE8586 dataset. Functional enrichment analysis of DEmRNAs revealed an abnormal reduction in mitochondrial-related activity and cellular responses to oxidative stress in patients with BPD. The neuropeptide-related genes OPRL1 and NPPA were found to be upregulated in BPD samples. Eventually, hsa-miR-1258, hsa-miR-298, hsa-miR-483-3p, and hsa-miR-769-5p were screened out and used to establish the prediction model. Calibration curves and detrended correspondence analysis (DCA) revealed that the model had good clinical applicability. Conclusions The prediction model provided a simple method for individualised assessment, early diagnosis, and prevention of BPD risk in preterm infants.
Collapse
Affiliation(s)
- Yue Zhang
- Department of Neonatal Intensive Care Unit, Beijing Aiyuhua Maternal and Children Hospital, Beijing, China
| | - Xiangyong Kong
- BaYi Children's Hospital, Seventh Medical Center of Chinese PLA General Hospital, China
| | - Jie Zhang
- Department of Neonatal Intensive Care Unit, Beijing Aiyuhua Maternal and Children Hospital, Beijing, China
| | - Xu Wang
- Department of Neonatal Intensive Care Unit, Beijing Aiyuhua Maternal and Children Hospital, Beijing, China
| |
Collapse
|
6
|
Early Salivary miRNA Expression in Extreme Low Gestational Age Newborns. Life (Basel) 2022; 12:life12040506. [PMID: 35454997 PMCID: PMC9029747 DOI: 10.3390/life12040506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 03/07/2022] [Accepted: 03/23/2022] [Indexed: 11/17/2022] Open
Abstract
Background: MicroRNAs (miRNA) are small non-coding RNAs that regulate gene expression playing a key role in organogenesis. MiRNAs are studied in tracheal aspirates (TA) of preterm infants. However; this is difficult to obtain in infants who are not intubated. This study examines early salivary miRNA expression as non-invasive early biomarkers in extremely low gestational age newborns (ELGANs). Methods: Saliva was collected using DNA-genotek swabs, miRNAs were analyzed using RNA seq and RT PCR arrays. Salivary miRNA expression was compared to TA using RNA seq at 3 days of age, and longitudinal changes at 28 days of age were analyzed using RT PCR arrays in ELGANs. Results: Approximately 822 ng of RNA was extracted from saliva of 7 ELGANs; Of the 757 miRNAs isolated, 161 miRNAs had significant correlation in saliva and TA at 3 days of age (r = 0.97). Longitudinal miRNA analysis showed 29 miRNAs downregulated and 394 miRNAs upregulated at 28 days compared to 3 days of age (adjusted p < 0.1). Bioinformatic analysis (Ingenuity Pathway Analysis) of differentially expressed miRNAs identified organismal injury and abnormalities and cellular development as the top physiological system development and cellular function. Conclusion: Salivary miRNA expression are source for early biomarkers of underlying pathophysiology in ELGANs.
Collapse
|
7
|
Malagraba G, Yarmohammadi M, Javed A, Barceló C, Rubio-Tomás T. The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update. Biomolecules 2022; 12:462. [PMID: 35327654 PMCID: PMC8946813 DOI: 10.3390/biom12030462] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 03/11/2022] [Accepted: 03/15/2022] [Indexed: 02/07/2023] Open
Abstract
Epigenetic mechanisms are known to play a key role in cancer progression. Specifically, histone methylation involves reversible post-translational modification of histones that govern chromatin structure remodelling, genomic imprinting, gene expression, DNA damage repair, and meiotic crossover recombination, among other chromatin-based activities. Demethylases are enzymes that catalyse the demethylation of their substrate using a flavin adenine dinucleotide-dependent amine oxidation process. Lysine-specific demethylase 1 (LSD1) and its homolog, lysine-specific demethylase 2 (LSD2), are overexpressed in a variety of human cancer types and, thus, regulate tumour progression. In this review, we focus on the literature from the last 5 years concerning the role of LSD1 and LSD2 in the main gastrointestinal cancers (i.e., gastric cancer, liver cancer, pancreatic cancer, and colorectal cancer).
Collapse
Affiliation(s)
- Gianluca Malagraba
- Translational Pancreatic Cancer Oncogenesis Group, Health Research Institute of the Balearic Islands (IdISBA), 07120 Palma de Mallorca, Spain;
| | - Mahdieh Yarmohammadi
- Central Tehran Branch, Department of Biology, Faculty of Sciences, Islamic Azad University, Tehran 1955847881, Iran;
| | - Aadil Javed
- Cancer Biology Laboratory, Department of Bioengineering, Faculty of Engineering, Ege University, Izmir 35040, Turkey;
| | - Carles Barceló
- Translational Pancreatic Cancer Oncogenesis Group, Health Research Institute of the Balearic Islands (IdISBA), 07120 Palma de Mallorca, Spain;
| | - Teresa Rubio-Tomás
- Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
- School of Medicine, University of Crete, 70013 Herakleion, Crete, Greece
| |
Collapse
|
8
|
Yu X, Liu Z, Pan Y, Cui X, Zhao X, Li D, Xue X, Fu J. Co-expression network analysis for identification of novel biomarkers of bronchopulmonary dysplasia model. Front Pediatr 2022; 10:946747. [PMID: 36440350 PMCID: PMC9696732 DOI: 10.3389/fped.2022.946747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 10/11/2022] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Bronchopulmonary dysplasia (BPD) is the most common neonatal chronic lung disease. However, its exact molecular pathogenesis is not understood. We aimed to identify relevant gene modules that may play crucial roles in the occurrence and development of BPD by weighted gene co-expression network analysis (WGCNA). METHODS We used RNA-Seq data of BPD and healthy control rats from our previous studies, wherein data from 30 samples was collected at days 1, 3, 7, 10, and 14. Data for preprocessing analysis included 17,613 differentially expressed genes (DEGs) with false discovery rate <0.05. RESULTS We grouped the highly correlated genes into 13 modules, and constructed a network of mRNA gene associations, including the 150 most associated mRNA genes in each module. Lgals8, Srpra, Prtfdc1, and Thap11 were identified as the key hub genes. Enrichment analyses revealed Golgi vesicle transport, coated vesicle, actin-dependent ATPase activity and endoplasmic reticulum pathways associated with these genes involved in the pathological process of BPD in module. CONCLUSIONS This is a study to analyze data obtained from BPD animal model at different time-points using WGCNA, to elucidate BPD-related susceptibility modules and disease-related genes.
Collapse
Affiliation(s)
- Xuefei Yu
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Ziyun Liu
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Yuqing Pan
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Xuewei Cui
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Xinyi Zhao
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Danni Li
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Xindong Xue
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Jianhua Fu
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| |
Collapse
|
9
|
Maeda H, Yao H, Go H, Huntington KE, De Paepe ME, Dennery PA. Involvement of miRNA-34a regulated Krüppel-like factor 4 expression in hyperoxia-induced senescence in lung epithelial cells. Respir Res 2022; 23:340. [PMID: 36496404 PMCID: PMC9741793 DOI: 10.1186/s12931-022-02263-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 11/28/2022] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Premature infants, subjected to supplemental oxygen and mechanical ventilation, may develop bronchopulmonary dysplasia, a chronic lung disease characterized by alveolar dysplasia and impaired vascularization. We and others have shown that hyperoxia causes senescence in cultured lung epithelial cells and fibroblasts. Although miR-34a modulates senescence, it is unclear whether it contributes to hyperoxia-induced senescence. We hypothesized that hyperoxia increases miR-34a levels, leading to cellular senescence. METHODS We exposed mouse lung epithelial (MLE-12) cells and primary human small airway epithelial cells to hyperoxia (95% O2/5% CO2) or air (21% O2/5% CO2) for 24 h. Newborn mice (< 12 h old) were exposed to hyperoxia (> 95% O2) for 3 days and allowed to recover in room air until postnatal day 7. Lung samples from premature human infants requiring mechanical ventilation and control subjects who were not mechanically ventilated were employed. RESULTS Hyperoxia caused senescence as indicated by loss of nuclear lamin B1, increased p21 gene expression, and senescence-associated secretory phenotype factors. Expression of miR-34a-5p was increased in epithelial cells and newborn mice exposed to hyperoxia, and in premature infants requiring mechanical ventilation. Transfection with a miR-34a-5p inhibitor reduced hyperoxia-induced senescence in MLE-12 cells. Additionally, hyperoxia increased protein levels of the oncogene and tumor-suppressor Krüppel-like factor 4 (KLF4), which were inhibited by a miR-34a-5p inhibitor. Furthermore, KLF4 knockdown by siRNA transfection reduced hyperoxia-induced senescence. CONCLUSION Hyperoxia increases miR-34a-5p, leading to senescence in lung epithelial cells. This is dictated in part by upregulation of KLF4 signaling. Therefore, inhibiting hyperoxia-induced senescence via miR-34a-5p or KLF4 suppression may provide a novel therapeutic strategy to mitigate the detrimental consequences of hyperoxia in the neonatal lung.
Collapse
Affiliation(s)
- Hajime Maeda
- grid.40263.330000 0004 1936 9094Department of Molecular Biology, Cellular Biology, and Biochemistry, Division of Biology and Medicine, Brown University, Providence, RI USA ,grid.411582.b0000 0001 1017 9540Department of Pediatrics, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Hongwei Yao
- grid.40263.330000 0004 1936 9094Department of Molecular Biology, Cellular Biology, and Biochemistry, Division of Biology and Medicine, Brown University, Providence, RI USA
| | - Hayato Go
- grid.411582.b0000 0001 1017 9540Department of Pediatrics, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Kelsey E. Huntington
- grid.40263.330000 0004 1936 9094Department of Pathology and Laboratory Medicine, Warren Alpert Medical School, Brown University, Providence, RI USA
| | - Monique E. De Paepe
- grid.241223.4Department of Pathology, Women and Infants Hospital, Providence, RI USA
| | - Phyllis A. Dennery
- grid.40263.330000 0004 1936 9094Department of Molecular Biology, Cellular Biology, and Biochemistry, Division of Biology and Medicine, Brown University, Providence, RI USA ,grid.40263.330000 0004 1936 9094Department of Pediatrics, Warren Alpert School of Medicine of Brown University, Providence, RI USA
| |
Collapse
|