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De Leon N, Tse WH, Ameis D, Keijzer R. Embryology and anatomy of congenital diaphragmatic hernia. Semin Pediatr Surg 2022; 31:151229. [PMID: 36446305 DOI: 10.1016/j.sempedsurg.2022.151229] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Prenatal and postnatal treatment modalities for congenital diaphragmatic hernia (CDH) continue to improve, however patients still face high rates of morbidity and mortality caused by severe underlying persistent pulmonary hypertension and pulmonary hypoplasia. Though the majority of CDH cases are idiopathic, it is believed that CDH is a polygenic developmental defect caused by interactions between candidate genes, as well as environmental and epigenetic factors. However, the origin and pathogenesis of these developmental insults are poorly understood. Further, connections between disrupted lung development and the failure of diaphragmatic closure during embryogenesis have not been fully elucidated. Though several animal models have been useful in identifying candidate genes and disrupted signalling pathways, more studies are required to understand the pathogenesis and to develop effective preventative care. In this article, we summarize the most recent litterature on disrupted embryological lung and diaphragmatic development associated with CDH.
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Affiliation(s)
- Nolan De Leon
- Departments of Surgery, Division of Pediatric Surgery, Pediatrics & Child Health and Physiology and Pathophysiology, University of Manitoba and Biology of Breathing Theme, Children's Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada
| | - Wai Hei Tse
- Departments of Surgery, Division of Pediatric Surgery, Pediatrics & Child Health and Physiology and Pathophysiology, University of Manitoba and Biology of Breathing Theme, Children's Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada
| | - Dustin Ameis
- Departments of Surgery, Division of Pediatric Surgery, Pediatrics & Child Health and Physiology and Pathophysiology, University of Manitoba and Biology of Breathing Theme, Children's Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada
| | - Richard Keijzer
- Departments of Surgery, Division of Pediatric Surgery, Pediatrics & Child Health and Physiology and Pathophysiology, University of Manitoba and Biology of Breathing Theme, Children's Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada.
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Exome sequencing of fetuses with congenital diaphragmatic hernia supports a causal role for NR2F2, PTPN11, and WT1 variants. Am J Surg 2021; 223:182-186. [PMID: 34315577 DOI: 10.1016/j.amjsurg.2021.07.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 05/28/2021] [Accepted: 07/16/2021] [Indexed: 11/23/2022]
Abstract
BACKGROUND To identify genes associated with congenital diaphragmatic hernia (CDH) to help understand the etiology and inform prognosis. METHODS We performed exome sequencing on fetuses with CDH and their parents to identify rare genetic variants likely to mediate risk. We reviewed prenatal characteristics and neonatal outcomes. RESULTS Data were generated for 22 parent-offspring trios. Six Likely Damaging (LD) variants were identified in five families (23 %). Three LD variants were in genes that contain variants in other CDH cohorts (NR2F2, PTPN11, WT1), while three were in genes that do not (CTR9, HDAC6, TP53). Integrating these data bolsters the evidence of association of NR2F2, PTPN11, and WT1 with CDH in humans. Of the five fetuses with a genetic diagnosis, one was terminated, two underwent perinatal demise, while two survived until repair. CONCLUSIONS Exome sequencing expands the diagnostic yield of genetic testing in CDH. Correlating CDH patients' exomes with clinical outcomes may enable personalized counseling and therapies.
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Gilbert RM, Schappell LE, Gleghorn JP. Defective mesothelium and limited physical space are drivers of dysregulated lung development in a genetic model of congenital diaphragmatic hernia. Development 2021; 148:dev199460. [PMID: 34015093 PMCID: PMC8180258 DOI: 10.1242/dev.199460] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 04/14/2021] [Indexed: 01/02/2023]
Abstract
Congenital diaphragmatic hernia (CDH) is a developmental disorder associated with diaphragm defects and lung hypoplasia. The etiology of CDH is complex and its clinical presentation is variable. We investigated the role of the pulmonary mesothelium in dysregulated lung growth noted in the Wt1 knockout mouse model of CDH. Loss of WT1 leads to intrafetal effusions, altered lung growth, and branching defects prior to normal closure of the diaphragm. We found significant differences in key genes; however, when Wt1 null lungs were cultured ex vivo, growth and branching were indistinguishable from wild-type littermates. Micro-CT imaging of embryos in situ within the uterus revealed a near absence of space in the dorsal chest cavity, but no difference in total chest cavity volume in Wt1 null embryos, indicating a redistribution of pleural space. The altered space and normal ex vivo growth suggest that physical constraints are contributing to the CDH lung phenotype observed in this mouse model. These studies emphasize the importance of examining the mesothelium and chest cavity as a whole, rather than focusing on single organs in isolation to understand early CDH etiology.
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Affiliation(s)
- Rachel M. Gilbert
- Departments of Biomedical Engineering, University of Delaware, Newark, DE 19716,USA
| | - Laurel E. Schappell
- Departments of Biomedical Engineering, University of Delaware, Newark, DE 19716,USA
| | - Jason P. Gleghorn
- Departments of Biomedical Engineering, University of Delaware, Newark, DE 19716,USA
- Departments of Biological Sciences, University of Delaware, Newark, DE 19716,USA
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Schnerwitzki D, Hayn C, Perner B, Englert C. Wt1 Positive dB4 Neurons in the Hindbrain Are Crucial for Respiration. Front Neurosci 2020; 14:529487. [PMID: 33328840 PMCID: PMC7734174 DOI: 10.3389/fnins.2020.529487] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 11/10/2020] [Indexed: 02/02/2023] Open
Abstract
Central pattern generator (CPG) networks coordinate the generation of rhythmic activity such as locomotion and respiration. Their development is driven by various transcription factors, one of which is the Wilms tumor protein (Wt1). It is present in dI6 neurons of the mouse spinal cord, and involved in the coordination of locomotion. Here we report about the presence of Wt1 in neurons of the caudoventral medulla oblongata and their impact on respiration. By employing immunohistofluorescence staining, we were able to characterize these Wt1 positive (+) cells as dB4 neurons. The temporal occurrence of Wt1 suggests a role for this transcription factor in the differentiation of dB4 neurons during embryonic and postnatal development. Conditional knockout of Wt1 in these cells caused an altered population size of V0 neurons already in the developing hindbrain, leading to a decline in the respiration rate in the adults. Thereby, we confirmed and extended the previously proposed similarity between dB4 neurons in the hindbrain and dI6 neurons of the spinal cord, in terms of development and function. Ablation of Wt1+ dB4 neurons resulted in the death of neonates due to the inability to initiate respiration, suggesting a vital role for Wt1+ dB4 neurons in breathing. These results expand the role of Wt1 in the CNS and show that, in addition to its function in differentiation of dI6 neurons, it also contributes to the development of dB4 neurons in the hindbrain that are critically involved in the regulation of respiration.
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Affiliation(s)
- Danny Schnerwitzki
- Molecular Genetics Laboratory, Leibniz Institute on Aging-Fritz Lipmann Institute (FLI), Jena, Germany
| | - Christian Hayn
- Molecular Genetics Laboratory, Leibniz Institute on Aging-Fritz Lipmann Institute (FLI), Jena, Germany
| | - Birgit Perner
- Molecular Genetics Laboratory, Leibniz Institute on Aging-Fritz Lipmann Institute (FLI), Jena, Germany.,Core Facility Imaging, Leibniz Institute on Aging-Fritz Lipmann Institute (FLI), Jena, Germany
| | - Christoph Englert
- Molecular Genetics Laboratory, Leibniz Institute on Aging-Fritz Lipmann Institute (FLI), Jena, Germany.,Institute of Biochemistry and Biophysics, Friedrich-Schiller-University Jena, Jena, Germany
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Perveen S, Ayasolla K, Zagloul N, Patel H, Ochani K, Orner D, Benveniste H, Salerno M, Vaska P, Zuo Z, Alabed Y, Nasim M, Miller EJ, Ahmed M. MIF inhibition enhances pulmonary angiogenesis and lung development in congenital diaphragmatic hernia. Pediatr Res 2019; 85:711-718. [PMID: 30759452 DOI: 10.1038/s41390-019-0335-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 12/31/2018] [Accepted: 02/04/2019] [Indexed: 11/09/2022]
Abstract
BACKGROUND Congenital diaphragmatic hernia (CDH) is a complex birth anomaly with significant mortality and morbidity. Lung hypoplasia and persistent pulmonary hypertension (PPHN) limit survival in CDH. Macrophage migration inhibitory factor (MIF), a key regulator of innate immunity, is involved in hypoxia-induced vascular remodeling and PPHN. We hypothesized that antenatal inhibition of MIF in CDH fetuses, would reduce vascular remodeling, and improve angiogenesis and lung development. METHODS Pregnant rats were randomized into three groups: Control, nitrofen, and nitrofen + ISO-92. Lung volumes of pups were measured by CT scanning. Right ventricular systolic pressure (RVSP) and vascular wall thickness (VWT) were measured together with MIF concentration, angiogenesis markers, lung morphometry, and histology. RESULTS Prenatal treatment with ISO-92, an MIF inhibitor, improved normalization of static lung volume, lung volume-to-body weight ratio, decreased alveolar septal thickness, RVSP and VWT and improved radial alveolar count as compared to the non-treated group. Expression of MIF was unaffected by ISO-92; however, ISO-92 increased p-eNOS and VEGF activities and reduced arginase 1, 2 and Sflt-1. CONCLUSION Prenatal inhibition of MIF activity in CDH rat model improves angiogenesis and lung development. This selective intervention may be a future therapeutic strategy to reduce the morbidity and mortality of this devastating condition.
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Affiliation(s)
- Shahana Perveen
- Division of Neonatal-Perinatal Medicine, Cohen Children's Medical Center, and Lilling Family Neonatal Research Laboratory, Feinstein Institute for Medical Research, Manhasset, NY, USA.
| | - Kamesh Ayasolla
- Division of Neonatal-Perinatal Medicine, Cohen Children's Medical Center, and Lilling Family Neonatal Research Laboratory, Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - Nahla Zagloul
- Division of Neonatal-Perinatal Medicine, Cohen Children's Medical Center, and Lilling Family Neonatal Research Laboratory, Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - Hardik Patel
- Division of Neonatal-Perinatal Medicine, Cohen Children's Medical Center, and Lilling Family Neonatal Research Laboratory, Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - Kanta Ochani
- Heart and Lung Research Unit, Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - David Orner
- Division of Neonatal-Perinatal Medicine, Cohen Children's Medical Center, and Lilling Family Neonatal Research Laboratory, Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - Helene Benveniste
- Department of Anesthesiology, Yale School of Medicine, New Haven, CT, USA
| | - Michael Salerno
- Department of Radiology, Stony Brook University, Stony Brook, NY, USA
| | - Paul Vaska
- Department of Radiology, Stony Brook University, Stony Brook, NY, USA.,Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, USA
| | - Zhang Zuo
- Department of Chemistry, Stony Brook University, Stony Brook, NY, USA
| | - Yousef Alabed
- Department of Medicinal Chemistry, Center for Molecular Innovation, Manhasset, NY, USA
| | - Mansoor Nasim
- Department of Pathology, Northwell Health, New Hyde Park, NY, USA
| | - Edmund J Miller
- Heart and Lung Research Unit, Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - Mohamed Ahmed
- Division of Neonatal-Perinatal Medicine, Cohen Children's Medical Center, and Lilling Family Neonatal Research Laboratory, Feinstein Institute for Medical Research, Manhasset, NY, USA
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Abstract
The outcomes of patients diagnosed with congenital diaphragmatic hernia (CDH) have recently improved. However, mortality and morbidity remain high, and this is primarily caused by the abnormal lung development resulting in pulmonary hypoplasia and persistent pulmonary hypertension. The pathogenesis of CDH is poorly understood, despite the identification of certain candidate genes disrupting normal diaphragm and lung morphogenesis in animal models of CDH. Defects within the lung mesenchyme and interstitium contribute to disturbed distal lung development. Frequently, a disturbance in the development of the pleuroperitoneal folds (PPFs) leads to the incomplete formation of the diaphragm and subsequent herniation. Most candidate genes identified in animal models have so far revealed relatively few strong associations in human CDH cases. CDH is likely a highly polygenic disease, and future studies will need to reconcile how disturbances in the expression of multiple genes cause the disease. Herein, we summarize the available literature on abnormal lung development associated with CDH.
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Affiliation(s)
- Dustin Ameis
- Department of Surgery, University of Manitoba, Winnipeg, Manitoba, Canada; Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Manitoba, Canada; Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, Manitoba, Canada; Biology of Breathing Theme, The Children׳s Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada
| | - Naghmeh Khoshgoo
- Department of Surgery, University of Manitoba, Winnipeg, Manitoba, Canada; Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Manitoba, Canada; Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, Manitoba, Canada; Biology of Breathing Theme, The Children׳s Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada
| | - Richard Keijzer
- Department of Surgery, University of Manitoba, Winnipeg, Manitoba, Canada; Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Manitoba, Canada; Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, Manitoba, Canada; Biology of Breathing Theme, The Children׳s Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada.
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Carmona R, Cañete A, Cano E, Ariza L, Rojas A, Muñoz-Chápuli R. Conditional deletion of WT1 in the septum transversum mesenchyme causes congenital diaphragmatic hernia in mice. eLife 2016; 5. [PMID: 27642710 PMCID: PMC5028188 DOI: 10.7554/elife.16009] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 09/08/2016] [Indexed: 11/25/2022] Open
Abstract
Congenital diaphragmatic hernia (CDH) is a severe birth defect. Wt1-null mouse embryos develop CDH but the mechanisms regulated by WT1 are unknown. We have generated a murine model with conditional deletion of WT1 in the lateral plate mesoderm, using the G2 enhancer of the Gata4 gene as a driver. 80% of G2-Gata4Cre;Wt1fl/fl embryos developed typical Bochdalek-type CDH. We show that the posthepatic mesenchymal plate coelomic epithelium gives rise to a mesenchyme that populates the pleuroperitoneal folds isolating the pleural cavities before the migration of the somitic myoblasts. This process fails when Wt1 is deleted from this area. Mutant embryos show Raldh2 downregulation in the lateral mesoderm, but not in the intermediate mesoderm. The mutant phenotype was partially rescued by retinoic acid treatment of the pregnant females. Replacement of intermediate by lateral mesoderm recapitulates the evolutionary origin of the diaphragm in mammals. CDH might thus be viewed as an evolutionary atavism. DOI:http://dx.doi.org/10.7554/eLife.16009.001
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Affiliation(s)
- Rita Carmona
- Department of Animal Biology, University of Málaga, Málaga, Spain.,Andalusian Center for Nanomedicine and Biotechnology (BIONAND), Málaga, Spain
| | - Ana Cañete
- Department of Animal Biology, University of Málaga, Málaga, Spain.,Andalusian Center for Nanomedicine and Biotechnology (BIONAND), Málaga, Spain
| | - Elena Cano
- Max Delbrück Center for Molecular Medicine, Berlin, Germany
| | - Laura Ariza
- Department of Animal Biology, University of Málaga, Málaga, Spain.,Andalusian Center for Nanomedicine and Biotechnology (BIONAND), Málaga, Spain
| | - Anabel Rojas
- Andalusian Center of Molecular Biology and Regenerative Medicine (CABIMER), Sevilla, Spain.,Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Sevilla, Spain
| | - Ramon Muñoz-Chápuli
- Department of Animal Biology, University of Málaga, Málaga, Spain.,Andalusian Center for Nanomedicine and Biotechnology (BIONAND), Málaga, Spain
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Ariza L, Carmona R, Cañete A, Cano E, Muñoz-Chápuli R. Coelomic epithelium-derived cells in visceral morphogenesis. Dev Dyn 2015; 245:307-22. [DOI: 10.1002/dvdy.24373] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 11/23/2015] [Accepted: 11/24/2015] [Indexed: 02/06/2023] Open
Affiliation(s)
- Laura Ariza
- University of Málaga, Faculty of Science, Department of Animal Biology; Málaga Spain
- Andalusian Center for Nanomedicine and Biotechnology (BIONAND); Campanillas Spain
| | - Rita Carmona
- University of Málaga, Faculty of Science, Department of Animal Biology; Málaga Spain
- Andalusian Center for Nanomedicine and Biotechnology (BIONAND); Campanillas Spain
| | - Ana Cañete
- University of Málaga, Faculty of Science, Department of Animal Biology; Málaga Spain
- Andalusian Center for Nanomedicine and Biotechnology (BIONAND); Campanillas Spain
| | - Elena Cano
- Integrative Vascular Biology Lab, Max Delbrück Center for Molecular Medicine; Robert-Rössle-Str. 10 13092, Berlin Germany
| | - Ramón Muñoz-Chápuli
- University of Málaga, Faculty of Science, Department of Animal Biology; Málaga Spain
- Andalusian Center for Nanomedicine and Biotechnology (BIONAND); Campanillas Spain
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Loo CKC, Pereira TN, Ramm GA. Case Report: Fetal Bilateral Diaphragmatic Agenesis, Ectopic Liver and Abnormal Pancreas. Fetal Pediatr Pathol 2015; 34:216-22. [PMID: 26030091 DOI: 10.3109/15513815.2015.1042605] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Congenital bilateral diaphragm agenesis is a very rare condition. We describe limited (abdomen only) autopsy findings of a case of bilateral diaphragm agenesis in a 27-week male fetus with unusual findings of fibrosis of the pancreatic head and ectopic liver nodules in a mass at the upper abdomen that may represent a possible diaphragm anlage. We have correlated our observations with data from experimental and embryological studies to suggest possible mechanisms for the malformations that were present and their implications for our understanding of pancreas, liver and diaphragm development in the human fetus.
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Affiliation(s)
- Christine K C Loo
- Department of Anatomical Pathology, SEALS, Prince of Wales Hospital, Sydney, Australia (Formerly: Department of Anatomical Pathology, Royal Brisbane and Women's Hospital , Brisbane , Australia )
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Gosemann JH, Doi T, Kutasy B, Friedmacher F, Dingemann J, Puri P. Pax3 gene expression is not altered during diaphragmatic development in nitrofen-induced congenital diaphragmatic hernia. J Pediatr Surg 2012; 47:1067-71. [PMID: 22703771 DOI: 10.1016/j.jpedsurg.2012.03.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2012] [Accepted: 03/05/2012] [Indexed: 11/18/2022]
Abstract
BACKGROUND/PURPOSE Malformations of the pleuroperitoneal folds (PPFs) have been identified as the origin of the diaphragmatic defect in congenital diaphragmatic hernia (CDH). Pax3, expressed in muscle precursor cells (MPCs), plays a key role in regulating myogenesis and muscularization in the fetal diaphragm. Pax3 mutant mice display absence of muscular diaphragm. However, the distribution of muscle precursor cells is reported to be normal in the PPF of the nitrofen-CDH model. We designed this study to investigate the hypothesis that Pax3 gene expression is unaltered in the PPF and developing diaphragm in the nitrofen-induced CDH model. METHODS Pregnant rats were treated with nitrofen or vehicle on gestational day (D) 9 and sacrificed on D13, D18, and D21. Pleuroperitoneal folds (D13) and developing diaphragms (D18 and D21) were dissected, total RNA was extracted, and real-time quantitative polymerase chain reaction was performed to determine Pax3 messenger RNA levels. Confocal immunofluorescence microscopy was performed to evaluate protein expression/distribution of Pax3. RESULTS Relative messenger RNA expression levels of Pax3 in PPFs and developing diaphragms were not significantly different in the nitrofen group compared with controls. Intensity of Pax3 immunofluorescence was also not altered in PPFs and developing diaphragms of the nitrofen group compared with controls. CONCLUSION Pax3 gene expression is not altered in the PPFs and developing diaphragm of nitrofen-CDH model, suggesting that the diaphragmatic defect is not caused by disturbance of myogenesis and muscularization.
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MESH Headings
- Animals
- Diaphragm/embryology
- Diaphragm/metabolism
- Diaphragm/pathology
- Embryonic Development/drug effects
- Female
- Gene Expression Regulation, Developmental/drug effects
- Hernia, Diaphragmatic/chemically induced
- Hernia, Diaphragmatic/embryology
- Hernia, Diaphragmatic/genetics
- Hernia, Diaphragmatic/metabolism
- Hernias, Diaphragmatic, Congenital
- Microscopy, Fluorescence
- PAX3 Transcription Factor
- Paired Box Transcription Factors/biosynthesis
- Paired Box Transcription Factors/genetics
- Peritoneum/embryology
- Peritoneum/metabolism
- Peritoneum/pathology
- Phenyl Ethers/toxicity
- Pleura/embryology
- Pleura/metabolism
- Pleura/pathology
- Pregnancy
- RNA, Messenger/biosynthesis
- Rats
- Rats, Sprague-Dawley
- Real-Time Polymerase Chain Reaction
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Affiliation(s)
- Jan-Hendrik Gosemann
- National Children's Research Centre, Our Lady's Children's Hospital, Dublin, Ireland
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Abstract
Congenital Diaphragmatic Hernia (CDH) is defined by the presence of an orifice in the diaphragm, more often left and posterolateral that permits the herniation of abdominal contents into the thorax. The lungs are hypoplastic and have abnormal vessels that cause respiratory insufficiency and persistent pulmonary hypertension with high mortality. About one third of cases have cardiovascular malformations and lesser proportions have skeletal, neural, genitourinary, gastrointestinal or other defects. CDH can be a component of Pallister-Killian, Fryns, Ghersoni-Baruch, WAGR, Denys-Drash, Brachman-De Lange, Donnai-Barrow or Wolf-Hirschhorn syndromes. Some chromosomal anomalies involve CDH as well. The incidence is < 5 in 10,000 live-births. The etiology is unknown although clinical, genetic and experimental evidence points to disturbances in the retinoid-signaling pathway during organogenesis. Antenatal diagnosis is often made and this allows prenatal management (open correction of the hernia in the past and reversible fetoscopic tracheal obstruction nowadays) that may be indicated in cases with severe lung hypoplasia and grim prognosis. Treatment after birth requires all the refinements of critical care including extracorporeal membrane oxygenation prior to surgical correction. The best hospital series report 80% survival but it remains around 50% in population-based studies. Chronic respiratory tract disease, neurodevelopmental problems, neurosensorial hearing loss and gastroesophageal reflux are common problems in survivors. Much more research on several aspects of this severe condition is warranted.
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Dingemann J, Doi T, Ruttenstock E, Puri P. The role of primary myogenic regulatory factors in the developing diaphragmatic muscle in the nitrofen-induced diaphragmatic hernia. Pediatr Surg Int 2011; 27:579-82. [PMID: 21258934 DOI: 10.1007/s00383-010-2834-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
PURPOSE The nitrofen model of congenital diaphragmatic hernia (CDH) is widely used to investigate the pathogenesis of CDH. However, the exact pathomechanism of the diaphragmatic defect is still unclear. Diaphragmatic muscularization represents the last stage of diaphragmatic development. Myogenic differentiation 1 (MyoD) and myogenic factor 5 (Myf5) play a crucial role in muscularization. MyoD(-/-) : Myf5(+/-) mutant mice show reduced diaphragmatic size, whereas MyoD(+/-) : Myf5(-/-) mutants have normal diaphragms. We designed this study to investigate diaphragmatic gene expression of MyoD and Myf5 in the nitrofen CDH model. METHODS Pregnant rats received nitrofen or vehicle on day 9 of gestation (D9), followed by cesarean section on D18 and D21. Fetal diaphragms (n = 40) were micro-dissected and divided into CDH group and controls. MyoD and Myf5 mRNA-expression were determined using Real-time PCR. Immunohistochemistry was performed to evaluate protein expression of MyoD and Myf5. RESULTS Relative diaphragmatic mRNA expression levels and immunoreactivity of MyoD were decreased in the CDH group on D18 and D21. Myf 5 mRNA and protein expression were not altered in the CDH group. CONCLUSION This is the first study showing that MyoD expression is selectively decreased in the diaphragm muscle in the nitrofen model of CDH.
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Affiliation(s)
- Jens Dingemann
- National Children's Research Centre, Our Lady's Children's Hospital, Dublin 12, Ireland
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