1
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Fitzsimons LA, Tasouri E, Willaredt MA, Stetson D, Gojak C, Kirsch J, Gardner HAR, Gorgas K, Tucker KL. Primary cilia are critical for tracheoesophageal septation. Dev Dyn 2024; 253:312-332. [PMID: 37776236 PMCID: PMC10922539 DOI: 10.1002/dvdy.660] [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: 03/13/2023] [Revised: 08/14/2023] [Accepted: 09/09/2023] [Indexed: 10/02/2023] Open
Abstract
INTRODUCTION Primary cilia play pivotal roles in the patterning and morphogenesis of a wide variety of organs during mammalian development. Here we examined murine foregut septation in the cobblestone mutant, a hypomorphic allele of the gene encoding the intraflagellar transport protein IFT88, a protein essential for normal cilia function. RESULTS We reveal a crucial role for primary cilia in foregut division, since their dramatic decrease in cilia in both the foregut endoderm and mesenchyme of mutant embryos resulted in a proximal tracheoesophageal septation defects and in the formation of distal tracheo(broncho)esophageal fistulae similar to the most common congenital tracheoesophageal malformations in humans. Interestingly, the dorsoventral patterning determining the dorsal digestive and the ventral respiratory endoderm remained intact, whereas Hedgehog signaling was aberrantly activated. CONCLUSIONS Our results demonstrate the cobblestone mutant to represent one of the very few mouse models that display both correct endodermal dorsoventral specification but defective compartmentalization of the proximal foregut. It stands exemplary for a tracheoesophageal ciliopathy, offering the possibility to elucidate the molecular mechanisms how primary cilia orchestrate the septation process. The plethora of malformations observed in the cobblestone embryo allow for a deeper insight into a putative link between primary cilia and human VATER/VACTERL syndromes.
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Affiliation(s)
- Lindsey Avery Fitzsimons
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, Maine, U.S.A
- Dept. of Biomedical Sciences, Center for Excellence in the Neurosciences, College of Osteopathic Medicine, University of New England, Biddeford, Maine 04005, U.S.A
| | - Evangelia Tasouri
- Interdisciplinary Center for Neurosciences, University of Heidelberg, 69120 Heidelberg, Germany
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Marc August Willaredt
- Interdisciplinary Center for Neurosciences, University of Heidelberg, 69120 Heidelberg, Germany
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Daniel Stetson
- AstraZeneca Pharmaceuticals LP, 35 Gatehouse Drive, Waltham, Massachusetts 02451, U.S.A
| | - Christian Gojak
- Interdisciplinary Center for Neurosciences, University of Heidelberg, 69120 Heidelberg, Germany
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Joachim Kirsch
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | | | - Karin Gorgas
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Kerry L. Tucker
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, Maine, U.S.A
- Dept. of Biomedical Sciences, Center for Excellence in the Neurosciences, College of Osteopathic Medicine, University of New England, Biddeford, Maine 04005, U.S.A
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2
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Edwards NA, Kashyap A, Warren A, Agricola ZN, Kenny AP, Shen Y, Chung WK, Zorn AM. Disrupted endosomal trafficking of the Vangl-Celsr polarity complex underlies congenital anomalies in trachea-esophageal morphogenesis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.11.561909. [PMID: 37873300 PMCID: PMC10592723 DOI: 10.1101/2023.10.11.561909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Disruptions in foregut morphogenesis can result in life-threatening conditions where the trachea and esophagus fail to separate properly, such as esophageal atresia (EA) and tracheoesophageal fistulas (TEF). The developmental basis of these congenital anomalies is poorly understood, but recent genome sequencing reveals that de novo variants in intracellular trafficking genes are enriched in EA/TEF patients. Here we show that mutation of orthologous genes in Xenopus disrupts trachea-esophageal separation similar to EA/TEF patients. We show that the Rab11a recycling endosome pathway is required to localize Vangl-Celsr polarity complexes at the cell surface where opposite sides of the common foregut tube fuse. Partial loss of endosome trafficking or the Vangl/Celsr complex disrupts epithelial polarity and cell division orientation. Mutant cells accumulate at the fusion point, fail to downregulate cadherin, and do not separate into distinct trachea and esophagus. These data provide new insights into the mechanisms of congenital anomalies and general paradigms of tissue fusion during organogenesis.
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3
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Anatomy and embryology of tracheo-esophageal fistula. Semin Pediatr Surg 2022; 31:151231. [PMID: 36459913 DOI: 10.1016/j.sempedsurg.2022.151231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Anomalies in tracheo-esophageal development result in a spectrum of congenital malformations ranging from, most commonly, esophageal atresia with or without trachea-esophageal fistula (EA+/-TEF) to esophageal web, duplication, stricture, tracheomalacia and tracheal agenesis. Despite the relative frequency of EA, however, the underlying etiology remains unknown and is likely due to a combination of genetic, epigenetic and environmental factors. In recent years, animal models have dramatically increased our understanding of the molecular and morphological processes involved in normal esophageal development during the key stages of anterior-posterior regionalization, dorsal-ventral patterning and morphogenic separation. Moreover, the use of animal models in conjunction with increasingly advanced techniques such as genomic sequencing, sophisticated live imaging studies and organoid models have more recently cast light on potential mechanisms involved in EA pathogenesis. This article aims to unravel some of the mysteries behind the anatomy and embryology of EA whilst providing insights into future directions for research.
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Raad S, David A, Sagniez M, Paré B, Orfi Z, Dumont NA, Smith MA, Faure C. iPSCs derived from esophageal atresia patients reveal SOX2 dysregulation at the anterior foregut stage. Dis Model Mech 2022; 15:dmm049541. [PMID: 36317486 PMCID: PMC10655818 DOI: 10.1242/dmm.049541] [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: 03/03/2022] [Accepted: 10/18/2022] [Indexed: 11/19/2023] Open
Abstract
A series of well-regulated cellular and molecular events result in the compartmentalization of the anterior foregut into the esophagus and trachea. Disruption of the compartmentalization process leads to esophageal atresia/tracheoesophageal fistula (EA/TEF). The cause of EA/TEF remains largely unknown. Therefore, to mimic the early development of the esophagus and trachea, we differentiated induced pluripotent stem cells (iPSCs) from EA/TEF patients, and iPSCs and embryonic stem cells from healthy individuals into mature three-dimensional esophageal organoids. CXCR4, SOX17 and GATA4 expression was similar in both patient-derived and healthy endodermal cells. The expression of the key transcription factor SOX2 was significantly lower in the patient-derived anterior foregut. We also observed an abnormal expression of NKX2.1 (or NKX2-1) in the patient-derived mature esophageal organoids. At the anterior foregut stage, RNA sequencing revealed the critical genes GSTM1 and RAB37 to be significantly lower in the patient-derived anterior foregut. We therefore hypothesize that a transient dysregulation of SOX2 and the abnormal expression of NKX2.1 in patient-derived cells could be responsible for the abnormal foregut compartmentalization.
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Affiliation(s)
- Suleen Raad
- Esophageal Development and Engineering Laboratory, CHU Sainte-Justine Research Center, 3175 Côte Sainte-Catherine, Montréal, Quebec H3T 1C5, Canada
| | - Anu David
- Esophageal Development and Engineering Laboratory, CHU Sainte-Justine Research Center, 3175 Côte Sainte-Catherine, Montréal, Quebec H3T 1C5, Canada
| | - Melanie Sagniez
- CHU Sainte-Justine Research Center, 3175 Côte Sainte-Catherine, Montréal, Quebec H3T 1C5, Canada
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montréal, Quebec H3T 1J4, Canada
| | - Bastien Paré
- CHU Sainte-Justine Research Center, 3175 Côte Sainte-Catherine, Montréal, Quebec H3T 1C5, Canada
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montréal, Quebec H3T 1J4, Canada
| | - Zakaria Orfi
- CHU Sainte-Justine Research Center, 3175 Côte Sainte-Catherine, Montréal, Quebec H3T 1C5, Canada
| | - Nicolas A. Dumont
- CHU Sainte-Justine Research Center, 3175 Côte Sainte-Catherine, Montréal, Quebec H3T 1C5, Canada
- School of Rehabilitation, Faculty of Medicine, Université de Montréal, Montréal, Quebec H3T 1J4, Canada
| | - Martin A. Smith
- CHU Sainte-Justine Research Center, 3175 Côte Sainte-Catherine, Montréal, Quebec H3T 1C5, Canada
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montréal, Quebec H3T 1J4, Canada
| | - Christophe Faure
- Esophageal Development and Engineering Laboratory, CHU Sainte-Justine Research Center, 3175 Côte Sainte-Catherine, Montréal, Quebec H3T 1C5, Canada
- Esophageal Atresia Clinic and Division of Pediatric Gastroenterology Hepatology and Nutrition, CHU Sainte-Justine, 3715 Côte Sainte-Catherine, Université de Montréal, Montréal, Quebec H3T1C5, Canada
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5
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Eenjes E, Tibboel D, Wijnen RM, Rottier RJ. Lung epithelium development and airway regeneration. Front Cell Dev Biol 2022; 10:1022457. [PMID: 36299482 PMCID: PMC9589436 DOI: 10.3389/fcell.2022.1022457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 09/20/2022] [Indexed: 11/21/2022] Open
Abstract
The lung is composed of a highly branched airway structure, which humidifies and warms the inhaled air before entering the alveolar compartment. In the alveoli, a thin layer of epithelium is in close proximity with the capillary endothelium, allowing for an efficient exchange of oxygen and carbon dioxide. During development proliferation and differentiation of progenitor cells generates the lung architecture, and in the adult lung a proper function of progenitor cells is needed to regenerate after injury. Malfunctioning of progenitors during development results in various congenital lung disorders, such as Congenital Diaphragmatic Hernia (CDH) and Congenital Pulmonary Adenomatoid Malformation (CPAM). In addition, many premature neonates experience continuous insults on the lung caused by artificial ventilation and supplemental oxygen, which requires a highly controlled mechanism of airway repair. Malfunctioning of airway progenitors during regeneration can result in reduction of respiratory function or (chronic) airway diseases. Pathways that are active during development are frequently re-activated upon damage. Understanding the basic mechanisms of lung development and the behavior of progenitor cell in the ontogeny and regeneration of the lung may help to better understand the underlying cause of lung diseases, especially those occurring in prenatal development or in the immediate postnatal period of life. This review provides an overview of lung development and the cell types involved in repair of lung damage with a focus on the airway.
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Affiliation(s)
- Evelien Eenjes
- Department of Pediatric Surgery, Erasmus MC-Sophia Children’s Hospital, Rotterdam, Netherlands
| | - Dick Tibboel
- Department of Pediatric Surgery, Erasmus MC-Sophia Children’s Hospital, Rotterdam, Netherlands
| | - Rene M.H. Wijnen
- Department of Pediatric Surgery, Erasmus MC-Sophia Children’s Hospital, Rotterdam, Netherlands
| | - Robbert J. Rottier
- Department of Pediatric Surgery, Erasmus MC-Sophia Children’s Hospital, Rotterdam, Netherlands
- Department of Cell Biology, Erasmus MC, Rotterdam, Netherlands
- *Correspondence: Robbert J. Rottier,
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6
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Zhong G, Ahimaz P, Edwards NA, Hagen JJ, Faure C, Lu Q, Kingma P, Middlesworth W, Khlevner J, El Fiky M, Schindel D, Fialkowski E, Kashyap A, Forlenza S, Kenny AP, Zorn AM, Shen Y, Chung WK. Identification and validation of candidate risk genes in endocytic vesicular trafficking associated with esophageal atresia and tracheoesophageal fistulas. HGG ADVANCES 2022; 3:100107. [PMID: 35519826 PMCID: PMC9065433 DOI: 10.1016/j.xhgg.2022.100107] [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: 08/24/2021] [Accepted: 04/06/2022] [Indexed: 11/15/2022] Open
Abstract
Esophageal atresias/tracheoesophageal fistulas (EA/TEF) are rare congenital anomalies caused by aberrant development of the foregut. Previous studies indicate that rare or de novo genetic variants significantly contribute to EA/TEF risk, and most individuals with EA/TEF do not have pathogenic genetic variants in established risk genes. To identify the genetic contributions to EA/TEF, we performed whole genome sequencing of 185 trios (probands and parents) with EA/TEF, including 59 isolated and 126 complex cases with additional congenital anomalies and/or neurodevelopmental disorders. There was a significant burden of protein-altering de novo coding variants in complex cases (p = 3.3 × 10-4), especially in genes that are intolerant of loss-of-function variants in the population. We performed simulation analysis of pathway enrichment based on background mutation rate and identified a number of pathways related to endocytosis and intracellular trafficking that as a group have a significant burden of protein-altering de novo variants. We assessed 18 variants for disease causality using CRISPR-Cas9 mutagenesis in Xenopus and confirmed 13 with tracheoesophageal phenotypes. Our results implicate disruption of endosome-mediated epithelial remodeling as a potential mechanism of foregut developmental defects. Our results suggest significant genetic heterogeneity of EA/TEF and may have implications for the mechanisms of other rare congenital anomalies.
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Affiliation(s)
- Guojie Zhong
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY, USA
- Integrated Program in Cellular, Molecular, and Biomedical Studies, Columbia University, New York, NY, USA
| | - Priyanka Ahimaz
- Department of Pediatrics, Columbia University Irving Medical Center, New York, NY, USA
| | - Nicole A. Edwards
- Center for Stem Cell & Organoid Medicine (CuSTOM), Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Jacob J. Hagen
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY, USA
- Department of Pediatrics, Columbia University Irving Medical Center, New York, NY, USA
| | - Christophe Faure
- Division of Pediatric Gastroenterology, CHU Sainte-Justine, Montreal, QC, Canada
| | - Qiao Lu
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY, USA
- Department of Pediatrics, Columbia University Irving Medical Center, New York, NY, USA
| | - Paul Kingma
- Division of Neonatology, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - William Middlesworth
- Division of Pediatric Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Julie Khlevner
- Division of Pediatric Gastroenterology, Hepatology and Nutrition, Columbia University Irving Medical Center, New York, NY, USA
| | - Mahmoud El Fiky
- Pediatric Surgery, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - David Schindel
- Division of Pediatric Surgery, UT Southwestern School of Medicine Dallas, Texas, USA
| | - Elizabeth Fialkowski
- Division of Pediatric Surgery, Oregon Health and Science University, Portland, OR, USA
| | - Adhish Kashyap
- Center for Stem Cell & Organoid Medicine (CuSTOM), Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Sophia Forlenza
- Division of Neonatology, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati, Cincinnati, OH, USA
| | - Alan P. Kenny
- Division of Neonatology, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati, Cincinnati, OH, USA
| | - Aaron M. Zorn
- Center for Stem Cell & Organoid Medicine (CuSTOM), Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, College of Medicine, Cincinnati, OH, USA
| | - Yufeng Shen
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY, USA
- Department of Biomedical Informatics, Columbia University Irving Medical Center, New York, NY, USA
| | - Wendy K. Chung
- Department of Pediatrics, Columbia University Irving Medical Center, New York, NY, USA
- Department of Medicine, Columbia University Irving Medical Center, New York, NY, USA
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7
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Brosens E, Brouwer RWW, Douben H, van Bever Y, Brooks AS, Wijnen RMH, van IJcken WFJ, Tibboel D, Rottier RJ, de Klein A. Heritability and De Novo Mutations in Oesophageal Atresia and Tracheoesophageal Fistula Aetiology. Genes (Basel) 2021; 12:genes12101595. [PMID: 34680991 PMCID: PMC8535313 DOI: 10.3390/genes12101595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 10/03/2021] [Accepted: 10/05/2021] [Indexed: 01/12/2023] Open
Abstract
Tracheoesophageal Fistula (TOF) is a congenital anomaly for which the cause is unknown in the majority of patients. OA/TOF is a variable feature in many (often mono-) genetic syndromes. Research using animal models targeting genes involved in candidate pathways often result in tracheoesophageal phenotypes. However, there is limited overlap in the genes implicated by animal models and those found in OA/TOF-related syndromic anomalies. Knowledge on affected pathways in animal models is accumulating, but our understanding on these pathways in patients lags behind. If an affected pathway is associated with both animals and patients, the mechanisms linking the genetic mutation, affected cell types or cellular defect, and the phenotype are often not well understood. The locus heterogeneity and the uncertainty of the exact heritability of OA/TOF results in a relative low diagnostic yield. OA/TOF is a sporadic finding with a low familial recurrence rate. As parents are usually unaffected, de novo dominant mutations seems to be a plausible explanation. The survival rates of patients born with OA/TOF have increased substantially and these patients start families; thus, the detection and a proper interpretation of these dominant inherited pathogenic variants are of great importance for these patients and for our understanding of OA/TOF aetiology.
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Affiliation(s)
- Erwin Brosens
- Department of Clinical Genetics, Erasmus University Medical Center-Sophia Children’s Hospital, 3000 CA Rotterdam, The Netherlands; (H.D.); (Y.v.B.); (A.S.B.); (A.d.K.)
- Correspondence:
| | - Rutger W. W. Brouwer
- Department of Cell Biology, Center for Biomics, Erasmus University Medical Center Rotterdam, 3000 CA Rotterdam, The Netherlands; (R.W.W.B.); (W.F.J.v.I.)
| | - Hannie Douben
- Department of Clinical Genetics, Erasmus University Medical Center-Sophia Children’s Hospital, 3000 CA Rotterdam, The Netherlands; (H.D.); (Y.v.B.); (A.S.B.); (A.d.K.)
| | - Yolande van Bever
- Department of Clinical Genetics, Erasmus University Medical Center-Sophia Children’s Hospital, 3000 CA Rotterdam, The Netherlands; (H.D.); (Y.v.B.); (A.S.B.); (A.d.K.)
| | - Alice S. Brooks
- Department of Clinical Genetics, Erasmus University Medical Center-Sophia Children’s Hospital, 3000 CA Rotterdam, The Netherlands; (H.D.); (Y.v.B.); (A.S.B.); (A.d.K.)
| | - Rene M. H. Wijnen
- Department of Pediatric Surgery, Erasmus University Medical Center-Sophia Children’s Hospital, 3000 CA Rotterdam, The Netherlands; (R.M.H.W.); (D.T.)
| | - Wilfred F. J. van IJcken
- Department of Cell Biology, Center for Biomics, Erasmus University Medical Center Rotterdam, 3000 CA Rotterdam, The Netherlands; (R.W.W.B.); (W.F.J.v.I.)
| | - Dick Tibboel
- Department of Pediatric Surgery, Erasmus University Medical Center-Sophia Children’s Hospital, 3000 CA Rotterdam, The Netherlands; (R.M.H.W.); (D.T.)
| | - Robbert J. Rottier
- Departments of Pediatric Surgery & Cell Biology, Erasmus University Medical Center Rotterdam, 3000 CA Rotterdam, The Netherlands;
| | - Annelies de Klein
- Department of Clinical Genetics, Erasmus University Medical Center-Sophia Children’s Hospital, 3000 CA Rotterdam, The Netherlands; (H.D.); (Y.v.B.); (A.S.B.); (A.d.K.)
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8
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Chooey J, Trexler C, Becker AM, Hogue JS. Esophageal atresia/tracheoesophageal fistula and proximal symphalangism in a patient with a NOG nonsense mutation. Am J Med Genet A 2021; 188:269-271. [PMID: 34472207 DOI: 10.1002/ajmg.a.62486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 07/27/2021] [Accepted: 08/13/2021] [Indexed: 11/07/2022]
Abstract
Esophageal atresia and tracheoesophageal fistula (EA/TEF) are relatively common malformations of the human foregut. The etiology remains incompletely understood with genetic causes identified in a small minority of affected patients. We present the case of a newborn with type C EA/TEF along with proximal symphalangism found to have a de novo NOG nonsense mutation. Patients with chromosome 17q deletions including the NOG gene have previously been reported to have EA/TEF but mutations in the gene have not been identified in patients with this malformation. This case provides evidence that haploinsufficiency for NOG may be the cause for EA/TEF in the 17q deletion syndrome and suggests that the clinical spectrum of NOG-related symphalangism spectrum disorders may include EA/TEF.
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Affiliation(s)
- Jonathan Chooey
- Department of Pediatrics, Madigan Army Medical Center, Tacoma, Washington, USA
| | - Connor Trexler
- Department of Pediatrics, Madigan Army Medical Center, Tacoma, Washington, USA
| | - Amy M Becker
- Department of Pediatrics, Madigan Army Medical Center, Tacoma, Washington, USA
| | - Jacob S Hogue
- Department of Pediatrics, Madigan Army Medical Center, Tacoma, Washington, USA
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9
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Edwards NA, Shacham-Silverberg V, Weitz L, Kingma PS, Shen Y, Wells JM, Chung WK, Zorn AM. Developmental basis of trachea-esophageal birth defects. Dev Biol 2021; 477:85-97. [PMID: 34023332 DOI: 10.1016/j.ydbio.2021.05.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 05/13/2021] [Accepted: 05/16/2021] [Indexed: 02/07/2023]
Abstract
Trachea-esophageal defects (TEDs), including esophageal atresia (EA), tracheoesophageal fistula (TEF), and laryngeal-tracheoesophageal clefts (LTEC), are a spectrum of life-threatening congenital anomalies in which the trachea and esophagus do not form properly. Up until recently, the developmental basis of these conditions and how the trachea and esophagus arise from a common fetal foregut was poorly understood. However, with significant advances in human genetics, organoids, and animal models, and integrating single cell genomics with high resolution imaging, we are revealing the molecular and cellular mechanisms that orchestrate tracheoesophageal morphogenesis and how disruption in these processes leads to birth defects. Here we review the current understanding of the genetic and developmental basis of TEDs. We suggest future opportunities for integrating developmental mechanisms elucidated from animals and organoids with human genetics and clinical data to gain insight into the genotype-phenotype basis of these heterogeneous birth defects. Finally, we envision how this will enhance diagnosis, improve treatment, and perhaps one day, lead to new tissue replacement therapy.
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Affiliation(s)
- Nicole A Edwards
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Center for Stem Cell & Organoid Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Vered Shacham-Silverberg
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Center for Stem Cell & Organoid Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Leelah Weitz
- Department of Pediatrics, Columbia University Medical Center, New York, NY, USA; Department of Medicine, Columbia University Medical Center, New York, NY, USA
| | - Paul S Kingma
- Division of Neonatology and Pulmonary Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Yufeng Shen
- Department of Systems Biology, Columbia University Medical Center, New York, NY, USA; Department of Biomedical Informatics, Columbia University Medical Center, New York, NY, USA
| | - James M Wells
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Center for Stem Cell & Organoid Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Wendy K Chung
- Department of Pediatrics, Columbia University Medical Center, New York, NY, USA; Department of Medicine, Columbia University Medical Center, New York, NY, USA
| | - Aaron M Zorn
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Center for Stem Cell & Organoid Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA.
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10
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Zhang Y, Bailey D, Yang P, Kim E, Que J. The development and stem cells of the esophagus. Development 2021; 148:148/6/dev193839. [PMID: 33782045 PMCID: PMC8034879 DOI: 10.1242/dev.193839] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The esophagus is derived from the anterior portion of the foregut endoderm, which also gives rise to the respiratory system. As it develops, the esophageal lining is transformed from a simple columnar epithelium into a stratified squamous cell layer, accompanied by the replacement of unspecified mesenchyme with layers of muscle cells. Studies in animal models have provided significant insights into the roles of various signaling pathways in esophageal development. More recent studies using human pluripotent stem cells (hPSCs) further demonstrate that some of these signaling pathways are conserved in human esophageal development. In addition, a combination of mouse genetics and hPSC differentiation approaches have uncovered new players that control esophageal morphogenesis. In this Review, we summarize these new findings and discuss how the esophagus is established and matures throughout different stages, including its initial specification, respiratory-esophageal separation, epithelial morphogenesis and maintenance. We also discuss esophageal muscular development and enteric nervous system innervation, which are essential for esophageal structure and function.
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Affiliation(s)
- Yongchun Zhang
- State Key Laboratory of Microbial Metabolism & Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China,Authors for correspondence (; )
| | - Dominique Bailey
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA,Columbia Center for Human Development, Columbia University Medical Center, New York, NY 10032, USA,Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, Columbia University Medical Center, New York, NY 10032, USA
| | - Patrick Yang
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA
| | - Eugene Kim
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA,Columbia Center for Human Development, Columbia University Medical Center, New York, NY 10032, USA
| | - Jianwen Que
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA,Columbia Center for Human Development, Columbia University Medical Center, New York, NY 10032, USA,Authors for correspondence (; )
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11
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Histological, immunohistochemical and transcriptomic characterization of human tracheoesophageal fistulas. PLoS One 2020; 15:e0242167. [PMID: 33201890 PMCID: PMC7671559 DOI: 10.1371/journal.pone.0242167] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 10/27/2020] [Indexed: 02/07/2023] Open
Abstract
Esophageal atresia (EA) and tracheoesophageal fistula (TEF) are relatively frequently occurring foregut malformations. EA/TEF is thought to have a strong genetic component. Not much is known regarding the biological processes disturbed or which cell type is affected in patients. This hampers the detection of the responsible culprits (genetic or environmental) for the origin of these congenital anatomical malformations. Therefore, we examined gene expression patterns in the TEF and compared them to the patterns in esophageal, tracheal and lung control samples. We studied tissue organization and key proteins using immunohistochemistry. There were clear differences between TEF and control samples. Based on the number of differentially expressed genes as well as histological characteristics, TEFs were most similar to normal esophagus. The BMP-signaling pathway, actin cytoskeleton and extracellular matrix pathways are downregulated in TEF. Genes involved in smooth muscle contraction are overexpressed in TEF compared to esophagus as well as trachea. These enriched pathways indicate myofibroblast activated fibrosis. TEF represents a specific tissue type with large contributions of intestinal smooth muscle cells and neurons. All major cell types present in esophagus are present-albeit often structurally disorganized-in TEF, indicating that its etiology should not be sought in cell fate specification.
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12
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Pinzon-Guzman C, Sangadala S, Riera KM, Popova EY, Manning E, Huh WJ, Alexander MS, Shelton JS, Boden SD, Goldenring JR. Noggin regulates foregut progenitor cell programming, and misexpression leads to esophageal atresia. J Clin Invest 2020; 130:4396-4410. [PMID: 32427591 PMCID: PMC7410075 DOI: 10.1172/jci123597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 05/13/2020] [Indexed: 01/05/2023] Open
Abstract
Esophageal atresia (EA/TEF) is a common congenital abnormality present in 1 of 4000 births. Here we show that atretic esophagi lack Noggin (NOG) expression, resulting in immature esophagus that contains respiratory glands. Moreover, when using mouse esophageal organoid units (EOUs) or tracheal organoid units (TOUs) as a model of foregut development and differentiation in vitro, NOG determines whether foregut progenitors differentiate toward esophageal or tracheal epithelium. These results indicate that NOG is a critical regulator of cell fate decisions between esophageal and pulmonary morphogenesis, and its lack of expression results in EA/TEF.
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Affiliation(s)
| | | | - Katherine M. Riera
- Department of Surgery, Vanderbilt University Medical Center , Nashville, Tennessee, USA
| | - Evgenya Y. Popova
- Department of Neural and Behavioral Sciences, Penn State University College of Medicine, Hershey, Pennsylvania, USA
| | - Elizabeth Manning
- Department of Surgery, Vanderbilt University Medical Center , Nashville, Tennessee, USA
| | - Won Jae Huh
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Matthew S. Alexander
- University of Iowa Hospitals and Clinics, Department of Surgery, Iowa City, Iowa, USA
| | - Julia S. Shelton
- University of Iowa Stead Family Children’s Hospital, Iowa City, Iowa, USA
| | - Scott D. Boden
- Department of Orthopedics, Emory School of Medicine, Atlanta, Georgia, USA
| | - James R. Goldenring
- Department of Surgery, Vanderbilt University Medical Center , Nashville, Tennessee, USA
- Cell & Developmental Biology, and
- the Epithelial Biology Center and Vanderbilt University Medical Center, Nashville, Tennessee, USA
- The Nashville VA Medical Center, Nashville, Tennessee, USA
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13
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Raad S, David A, Que J, Faure C. Genetic Mouse Models and Induced Pluripotent Stem Cells for Studying Tracheal-Esophageal Separation and Esophageal Development. Stem Cells Dev 2020; 29:953-966. [PMID: 32515280 PMCID: PMC9839344 DOI: 10.1089/scd.2020.0075] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Esophagus and trachea arise from a common origin, the anterior foregut tube. The compartmentalization process of the foregut into the esophagus and trachea is still poorly understood. Esophageal atresia/tracheoesophageal fistula (EA/TEF) is one of the most common gastrointestinal congenital defects with an incidence rate of 1 in 2,500 births. EA/TEF is linked to the disruption of the compartmentalization process of the foregut tube. In EA/TEF patients, other organ anomalies and disorders have also been reported. Over the last two decades, animal models have shown the involvement of multiple signaling pathways and transcription factors in the development of the esophagus and trachea. Use of induced pluripotent stem cells (iPSCs) to understand organogenesis has been a valuable tool for mimicking gastrointestinal and respiratory organs. This review focuses on the signaling mechanisms involved in esophageal development and the use of iPSCs to model and understand it.
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Affiliation(s)
- Suleen Raad
- Esophageal Development and Engineering Laboratory, Sainte-Justine Research Centre, Montreal, Quebec, Canada
| | - Anu David
- Esophageal Development and Engineering Laboratory, Sainte-Justine Research Centre, Montreal, Quebec, Canada
| | - Jianwen Que
- Division of Digestive and Liver Diseases, Department of Medicine, Center for Human Development, Columbia University, New York, New York, USA
| | - Christophe Faure
- Esophageal Development and Engineering Laboratory, Sainte-Justine Research Centre, Montreal, Quebec, Canada.,Esophageal Atresia Clinic and Division of Pediatric Gastroenterology Hepatology and Nutrition, CHU Sainte Justine, Université de Montréal, Montréal, Quebec, Canada.,Address correspondence to: Dr. Christophe Faure, Division of Pediatric Gastroenterology, Sainte-Justine Hospital, 3715 Côte Sainte Catherine, Montreal H3T1C5, Quebec, Canada
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14
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Zhang Y, Que J. BMP Signaling in Development, Stem Cells, and Diseases of the Gastrointestinal Tract. Annu Rev Physiol 2020; 82:251-273. [PMID: 31618602 DOI: 10.1146/annurev-physiol-021119-034500] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The bone morphogenetic protein (BMP) pathway is essential for the morphogenesis of multiple organs in the digestive system. Abnormal BMP signaling has also been associated with disease initiation and progression in the gastrointestinal (GI) tract and associated organs. Recent studies using animal models, tissue organoids, and human pluripotent stem cells have significantly expanded our understanding of the roles played by BMPs in the development and homeostasis of GI organs. It is clear that BMP signaling regulates GI function and disease progression that involve stem/progenitor cells and inflammation in a tissue-specific manner. In this review we discuss these new findings with a focus on the esophagus, stomach, and intestine.
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Affiliation(s)
- Yongchun Zhang
- Division of Digestive and Liver Diseases, Department of Medicine, Columbia University, New York, NY 10032, USA; .,Columbia Center for Human Development, Columbia University Medical Center, New York, NY 10032, USA
| | - Jianwen Que
- Division of Digestive and Liver Diseases, Department of Medicine, Columbia University, New York, NY 10032, USA; .,Columbia Center for Human Development, Columbia University Medical Center, New York, NY 10032, USA
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15
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Isl1 Regulation of Nkx2.1 in the Early Foregut Epithelium Is Required for Trachea-Esophageal Separation and Lung Lobation. Dev Cell 2019; 51:675-683.e4. [PMID: 31813798 DOI: 10.1016/j.devcel.2019.11.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 09/18/2019] [Accepted: 11/04/2019] [Indexed: 02/07/2023]
Abstract
The esophagus and trachea arise from the dorsal and ventral aspects of the anterior foregut, respectively. Abnormal trachea-esophageal separation leads to the common birth defect esophageal atresia with or without trachea-esophageal fistula (EA/TEF). Yet the underlying cellular mechanisms remain unknown. Here, we combine Xenopus and mouse genetic models to identify that the transcription factor Isl1 orchestrates trachea-esophageal separation through modulating a specific epithelial progenitor cell population (midline epithelial cells [MECs], Isl1+ Nkx2.1+ Sox2+) located at the dorsal-ventral boundary of the foregut. Lineage tracing experiments show that MECs contribute to both tracheal and esophageal epithelium, and Isl1 is required for Nkx2.1 transcription in MECs. Deletion of the chromosomal region spanning the ISL1 gene has been found in patients with abnormal trachea-esophageal separation. Our studies thus provide definitive evidence that ISL1 is a critical player in the process of foregut morphogenesis, acting in a small progenitor population of boundary cells.
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16
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van Lennep M, Singendonk MMJ, Dall'Oglio L, Gottrand F, Krishnan U, Terheggen-Lagro SWJ, Omari TI, Benninga MA, van Wijk MP. Oesophageal atresia. Nat Rev Dis Primers 2019; 5:26. [PMID: 31000707 DOI: 10.1038/s41572-019-0077-0] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Oesophageal atresia (EA) is a congenital abnormality of the oesophagus that is caused by incomplete embryonic compartmentalization of the foregut. EA commonly occurs with a tracheo-oesophageal fistula (TEF). Associated birth defects or anomalies, such as VACTERL association, trisomy 18 or 21 and CHARGE syndrome, occur in the majority of patients born with EA. Although several studies have revealed signalling pathways and genes potentially involved in the development of EA, our understanding of the pathophysiology of EA lags behind the improvements in surgical and clinical care of patients born with this anomaly. EA is treated surgically to restore the oesophageal interruption and, if present, ligate and divide the TEF. Survival is now ~90% in those born with EA with severe associated anomalies and even higher in those born with EA alone. Despite these achievements, long-term gastrointestinal and respiratory complications and comorbidities in patients born with EA are common and lead to decreased quality of life. Oesophageal motility disorders are probably ubiquitous in patients after undergoing EA repair and often underlie these complications and comorbidities. The implementation of several new diagnostic and screening tools in clinical care, including high-resolution impedance manometry, pH-multichannel intraluminal impedance testing and disease-specific quality of life questionnaires now provide better insight into these problems and may contribute to better long-term outcomes in the future.
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Affiliation(s)
- Marinde van Lennep
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Pediatric Gastroenterology and Nutrition, Amsterdam, The Netherlands
| | - Maartje M J Singendonk
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Pediatric Gastroenterology and Nutrition, Amsterdam, The Netherlands
| | - Luigi Dall'Oglio
- Digestive Endoscopy and Surgery Unit, Bambino Gesu Children's Hospital-IRCCS, Rome, Italy
| | - Fréderic Gottrand
- CHU Lille, University Lille, National Reference Center for Congenital Malformation of the Esophagus, Department of Pediatric Gastroenterology Hepatology and Nutrition, Lille, France
| | - Usha Krishnan
- Department of Paediatric Gastroenterology, Sydney Children's Hospital, Sydney, New South Wales, Australia
- Discipline of Paediatrics, School of Women's and Children's Health, University of New South Wales, Sydney, New South Wales, Australia
| | - Suzanne W J Terheggen-Lagro
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Pediatric Pulmonology, Amsterdam, The Netherlands
| | - Taher I Omari
- College of Medicine and Public Health, Flinders University, Adelaide, South Australia, Australia
- Center for Neuroscience, Flinders University, Adelaide, South Australia, Australia
| | - Marc A Benninga
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Pediatric Gastroenterology and Nutrition, Amsterdam, The Netherlands.
| | - Michiel P van Wijk
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Pediatric Gastroenterology and Nutrition, Amsterdam, The Netherlands
- Emma Children's Hospital, Amsterdam UMC, Vrije Universiteit, Pediatric Gastroenterology, Amsterdam, The Netherlands
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17
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Lawson LY, Harfe BD. Developmental mechanisms of intervertebral disc and vertebral column formation. WILEY INTERDISCIPLINARY REVIEWS-DEVELOPMENTAL BIOLOGY 2017; 6. [DOI: 10.1002/wdev.283] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 05/09/2017] [Accepted: 05/23/2017] [Indexed: 01/01/2023]
Affiliation(s)
- Lisa Y. Lawson
- Department of Molecular Genetics and Microbiology; Genetics Institute University of Florida, College of Medicine; Gainesville FL USA
| | - Brian D. Harfe
- Department of Molecular Genetics and Microbiology; Genetics Institute University of Florida, College of Medicine; Gainesville FL USA
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18
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Ghannam M, Jumah F, Mansour S, Samara A, Alkhdour S, Alzuabi MA, Aker L, Adeeb N, Massengale J, Oskouian RJ, Tubbs RS. Surgical anatomy, radiological features, and molecular biology of the lumbar intervertebral discs. Clin Anat 2017; 30:251-266. [PMID: 27997062 DOI: 10.1002/ca.22822] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 12/04/2016] [Indexed: 01/07/2023]
Abstract
The intervertebral disc (IVD) is a joint unique in structure and functions. Lying between adjacent vertebrae, it provides both the primary support and the elasticity required for the spine to move stably. Various aspects of the IVD have long been studied by researchers seeking a better understanding of its dynamics, aging, and subsequent disorders. In this article, we review the surgical anatomy, imaging modalities, and molecular biology of the lumbar IVD. Clin. Anat. 30:251-266, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Malik Ghannam
- An-Najah National University Hospital, Nablus, Palestine
| | - Fareed Jumah
- An-Najah National University Hospital, Nablus, Palestine
| | - Shaden Mansour
- An-Najah National University Hospital, Nablus, Palestine
| | - Amjad Samara
- An-Najah National University Hospital, Nablus, Palestine
| | - Saja Alkhdour
- An-Najah National University Hospital, Nablus, Palestine
| | | | - Loai Aker
- An-Najah National University Hospital, Nablus, Palestine
| | - Nimer Adeeb
- Department of Neurosurgery, Boston Medical Center, Boston University, Massachusetts
| | - Justin Massengale
- Department of Neurosurgery, Boston Medical Center, Boston University, Massachusetts
| | | | - R Shane Tubbs
- Department of Anatomical Sciences, St. George's University, Grenada.,Seattle Science Foundation, Seattle, Washington
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19
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Perin S, McCann CJ, Borrelli O, De Coppi P, Thapar N. Update on Foregut Molecular Embryology and Role of Regenerative Medicine Therapies. Front Pediatr 2017; 5:91. [PMID: 28503544 PMCID: PMC5408018 DOI: 10.3389/fped.2017.00091] [Citation(s) in RCA: 14] [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: 02/21/2017] [Accepted: 04/11/2017] [Indexed: 01/07/2023] Open
Abstract
Esophageal atresia (OA) represents one of the commonest and most severe developmental disorders of the foregut, the most proximal segment of the gastrointestinal (GI) tract (esophagus and stomach) in embryological terms. Of intrigue is the common origin from this foregut of two very diverse functional entities, the digestive and respiratory systems. OA appears to result from incomplete separation of the ventral and dorsal parts of the foregut during development, resulting in disruption of esophageal anatomy and frequent association with tracheo-oesophageal fistula. Not surprisingly, and likely inherent to OA, are associated abnormalities in components of the enteric neuromusculature and ultimately loss of esophageal functional integrity. An appreciation of such developmental processes and associated defects has not only enhanced our understanding of the etiopathogenesis underlying such devastating defects but also highlighted the potential of novel corrective therapies. There has been considerable progress in the identification and propagation of neural crest stem cells from the GI tract itself or derived from pluripotent cells. Such cells have been successfully transplanted into models of enteric neuropathy confirming their ability to functionally integrate and replenish missing or defective enteric nerves. Combinatorial approaches in tissue engineering hold significant promise for the generation of organ-specific scaffolds such as the esophagus with current initiatives directed toward their cellularization to facilitate optimal function. This chapter outlines the most current understanding of the molecular embryology underlying foregut development and OA, and also explores the promise of regenerative medicine.
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Affiliation(s)
- Silvia Perin
- Stem Cells and Regenerative Medicine, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Conor J McCann
- Stem Cells and Regenerative Medicine, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Osvaldo Borrelli
- Neurogastroenterology and Motility Unit, Department of Gastroenterology, Great Ormond Street Hospital NHS Foundation Trust, London, UK
| | - Paolo De Coppi
- Stem Cells and Regenerative Medicine, UCL Great Ormond Street Institute of Child Health, London, UK.,Specialist Neonatal and Paediatric Surgery (SNAPS) Department, Great Ormond Street Hospital NHS Foundation Trust, London, UK
| | - Nikhil Thapar
- Stem Cells and Regenerative Medicine, UCL Great Ormond Street Institute of Child Health, London, UK.,Neurogastroenterology and Motility Unit, Department of Gastroenterology, Great Ormond Street Hospital NHS Foundation Trust, London, UK
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20
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Zhang Y, Jiang M, Kim E, Lin S, Liu K, Lan X, Que J. Development and stem cells of the esophagus. Semin Cell Dev Biol 2016; 66:25-35. [PMID: 28007661 DOI: 10.1016/j.semcdb.2016.12.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 12/16/2016] [Accepted: 12/16/2016] [Indexed: 02/07/2023]
Abstract
The esophagus is derived from the anterior portion of the developmental intermediate foregut, a structure that also gives rise to other organs including the trachea, lung, and stomach. Genetic studies have shown that multiple signaling pathways (e.g. Bmp) and transcription factors (e.g. SOX2) are required for the separation of the esophagus from the neighboring respiratory system. Notably, some of these signaling pathways and transcription factors continue to play essential roles in the subsequent morphogenesis of the esophageal epithelium which undergoes a simple columnar-to-stratified squamous conversion. Reactivation of the relevant signaling pathways has also been associated with pathogenesis of esophageal diseases that affect the epithelium and its stem cells in adults. In this review we will summarize these findings. We will also discuss new data regarding the cell-of-origin for the striated and smooth muscles surrounding the esophagus and how they are differentiated from the mesenchyme during development.
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Affiliation(s)
- Yongchun Zhang
- Division of Digestive and Liver Diseases and Center for Human Development, Department of Medicine, Columbia University, NY 10032, USA
| | - Ming Jiang
- Division of Digestive and Liver Diseases and Center for Human Development, Department of Medicine, Columbia University, NY 10032, USA
| | - Eugene Kim
- Division of Digestive and Liver Diseases and Center for Human Development, Department of Medicine, Columbia University, NY 10032, USA
| | - Sijie Lin
- Division of Digestive and Liver Diseases and Center for Human Development, Department of Medicine, Columbia University, NY 10032, USA
| | - Kuancan Liu
- Division of Digestive and Liver Diseases and Center for Human Development, Department of Medicine, Columbia University, NY 10032, USA; Institute for Laboratory Medicine, Fuzhou General Hospital, PLA, Fuzhou, Fujian 350025, PR China
| | - Xiaopeng Lan
- Institute for Laboratory Medicine, Fuzhou General Hospital, PLA, Fuzhou, Fujian 350025, PR China
| | - Jianwen Que
- Division of Digestive and Liver Diseases and Center for Human Development, Department of Medicine, Columbia University, NY 10032, USA.
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21
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Gottrand M, Michaud L, Sfeir R, Gottrand F. Motility, digestive and nutritional problems in Esophageal Atresia. Paediatr Respir Rev 2016; 19:28-33. [PMID: 26752295 DOI: 10.1016/j.prrv.2015.11.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 11/16/2015] [Indexed: 12/11/2022]
Abstract
Esophageal atresia (EA) with or without tracheoesophageal fistula (TEF) is a rare congenital malformation. Digestive and nutritional problems remain frequent in children with EA both in early infancy and at long-term follow-up. These patients are at major risk of presenting with gastroesophageal reflux and its complications, such as anastomotic strictures. Esophageal dysmotility is constant, and can have important consequences on feeding and nutritional status. Patients with EA need a systematic follow-up with a multidisciplinary team.
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Affiliation(s)
- Madeleine Gottrand
- CHU Lille, University Lille, National reference center for congenital malformation of the esophagus, Department of Pediatrics, F-59000 Lille, France.
| | - Laurent Michaud
- CHU Lille, University Lille, National reference center for congenital malformation of the esophagus, Department of Pediatrics, F-59000 Lille, France.
| | - Rony Sfeir
- CHU Lille, University Lille, National reference center for congenital malformation of the esophagus, Department of Pediatrics, F-59000 Lille, France.
| | - Frédéric Gottrand
- CHU Lille, University Lille, National reference center for congenital malformation of the esophagus, Department of Pediatrics, F-59000 Lille, France.
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22
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Decoding the intervertebral disc: Unravelling the complexities of cell phenotypes and pathways associated with degeneration and mechanotransduction. Semin Cell Dev Biol 2016; 62:94-103. [PMID: 27208724 DOI: 10.1016/j.semcdb.2016.05.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 05/17/2016] [Indexed: 12/20/2022]
Abstract
Back pain is the most common cause of pain and disability worldwide. While its etiology remains unknown, it is typically associated with intervertebral disc (IVD) degeneration. Despite the prevalence of back pain, relatively little is known about the specific cellular pathways and mechanisms that contribute to the development, function and degeneration of the IVD. Consequently, current treatments for back pain are largely limited to symptomatic interventions. However, major progress is being made in multiple research directions to unravel the biology and pathology of the IVD, raising hope that effective disease-modifying interventions will soon be developed. In this review, we will discuss our current knowledge and gaps in knowledge on the developmental origin of the IVD, the phenotype of the distinct cell types found within the IVD tissues, molecular targets in IVD degeneration identified using bioinformatics strategies, and mechanotransduction pathways that influence IVD cell fate and function.
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23
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Rosekrans SL, Baan B, Muncan V, van den Brink GR. Esophageal development and epithelial homeostasis. Am J Physiol Gastrointest Liver Physiol 2015; 309:G216-28. [PMID: 26138464 DOI: 10.1152/ajpgi.00088.2015] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 06/25/2015] [Indexed: 01/31/2023]
Abstract
The esophagus is a relatively simple organ that evolved to transport food and liquids through the thoracic cavity. It is the only part of the gastrointestinal tract that lacks any metabolic, digestive, or absorptive function. The mucosa of the adult esophagus is covered by a multilayered squamous epithelium with a remarkable similarity to the epithelium of the skin despite the fact that these tissues originate from two different germ layers. Here we review the developmental pathways involved in the establishment of the esophagus and the way these pathways regulate gut-airway separation. We summarize current knowledge of the mechanisms that maintain homeostasis in esophageal epithelial renewal in the adult and the molecular mechanism of the development of Barrett's metaplasia, the precursor lesion to esophageal adenocarcinoma. Finally, we examine the ongoing debate on the hierarchy of esophageal epithelial precursor cells and on the presence or absence of a specific esophageal stem cell population. Together the recent insights into esophageal development and homeostasis suggest that the pathways that establish the esophagus during development also play a role in the maintenance of the adult epithelium. We are beginning to understand how reflux of gastric content and the resulting chronic inflammation can transform the squamous esophageal epithelium to columnar intestinal type metaplasia in Barrett's esophagus.
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Affiliation(s)
- Sanne L Rosekrans
- Tytgat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, the Netherlands
| | - Bart Baan
- Tytgat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, the Netherlands
| | - Vanesa Muncan
- Tytgat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, the Netherlands
| | - Gijs R van den Brink
- Tytgat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, the Netherlands
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24
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Chan WCW, Au TYK, Tam V, Cheah KSE, Chan D. Coming together is a beginning: the making of an intervertebral disc. ACTA ACUST UNITED AC 2015; 102:83-100. [PMID: 24677725 DOI: 10.1002/bdrc.21061] [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] [Received: 02/09/2014] [Accepted: 02/27/2014] [Indexed: 01/07/2023]
Abstract
The intervertebral disc (IVD) is a complex fibrocartilaginous structure located between the vertebral bodies that allows for movement and acts as a shock absorber in our spine for daily activities. It is composed of three components: the nucleus pulposus (NP), annulus fibrosus, and cartilaginous endplate. The characteristics of these cells are different, as they produce specific extracellular matrix (ECM) for tissue function and the niche in supporting the differentiation status of the cells in the IVD. Furthermore, cell heterogeneities exist in each compartment. The cells and the supporting ECM change as we age, leading to degenerative outcomes that often lead to pathological symptoms such as back pain and sciatica. There are speculations as to the potential of cell therapy or the use of tissue engineering as treatments. However, the nature of the cells present in the IVD that support tissue function is not clear. This review looks at the origin of cells in the making of an IVD, from the earliest stages of embryogenesis in the formation of the notochord, and its role as a signaling center, guiding the formation of spine, and in its journey to become the NP at the center of the IVD. While our current understanding of the molecular signatures of IVD cells is still limited, the field is moving fast and the potential is enormous as we begin to understand the progenitor and differentiated cells present, their molecular signatures, and signals that we could harness in directing the appropriate in vitro and in vivo cellular responses in our quest to regain or maintain a healthy IVD as we age.
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Affiliation(s)
- Wilson C W Chan
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong, China
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25
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McCulley D, Wienhold M, Sun X. The pulmonary mesenchyme directs lung development. Curr Opin Genet Dev 2015; 32:98-105. [PMID: 25796078 PMCID: PMC4763935 DOI: 10.1016/j.gde.2015.01.011] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 01/27/2015] [Accepted: 01/30/2015] [Indexed: 11/22/2022]
Abstract
Each of the steps of respiratory system development relies on intricate interactions and coordinated development of the lung epithelium and mesenchyme. In the past, more attention has been paid to the epithelium than the mesenchyme. The mesenchyme is a source of specification and morphogenetic signals as well as a host of surprisingly complex cell lineages that are critical for normal lung development and function. This review highlights recent research focusing on the mesenchyme that has revealed genetic and epigenetic mechanisms of its development in the context of other cell layers during respiratory lineage specification, branching morphogenesis, epithelial differentiation, lineage distinction, vascular development, and alveolar maturation.
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Affiliation(s)
- David McCulley
- Laboratory of Genetics, University of Wisconsin-Madison, Madison, WI 53706, United States; Department of Pediatrics, University of Wisconsin-Madison, Madison, WI 53706, United States
| | - Mark Wienhold
- Laboratory of Genetics, University of Wisconsin-Madison, Madison, WI 53706, United States; Department of Pediatrics, University of Wisconsin-Madison, Madison, WI 53706, United States
| | - Xin Sun
- Laboratory of Genetics, University of Wisconsin-Madison, Madison, WI 53706, United States.
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Jiang M, Ku WY, Zhou Z, Dellon ES, Falk GW, Nakagawa H, Wang ML, Liu K, Wang J, Katzka DA, Peters JH, Lan X, Que J. BMP-driven NRF2 activation in esophageal basal cell differentiation and eosinophilic esophagitis. J Clin Invest 2015; 125:1557-68. [PMID: 25774506 DOI: 10.1172/jci78850] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 01/29/2015] [Indexed: 12/17/2022] Open
Abstract
Tissue homeostasis requires balanced self-renewal and differentiation of stem/progenitor cells, especially in tissues that are constantly replenished like the esophagus. Disruption of this balance is associated with pathological conditions, including eosinophilic esophagitis (EoE), in which basal progenitor cells become hyperplastic upon proinflammatory stimulation. However, how basal cells respond to the inflammatory environment at the molecular level remains undetermined. We previously reported that the bone morphogenetic protein (BMP) signaling pathway is critical for epithelial morphogenesis in the embryonic esophagus. Here, we address how this pathway regulates tissue homeostasis and EoE development in the adult esophagus. BMP signaling was specifically activated in differentiated squamous epithelium, but not in basal progenitor cells, which express the BMP antagonist follistatin. Previous reports indicate that increased BMP activity promotes Barrett's intestinal differentiation; however, in mice, basal progenitor cell-specific expression of constitutively active BMP promoted squamous differentiation. Moreover, BMP activation increased intracellular ROS levels, initiating an NRF2-mediated oxidative response during basal progenitor cell differentiation. In both a mouse EoE model and human biopsies, reduced squamous differentiation was associated with high levels of follistatin and disrupted BMP/NRF2 pathways. We therefore propose a model in which normal squamous differentiation of basal progenitor cells is mediated by BMP-driven NRF2 activation and basal cell hyperplasia is promoted by disruption of BMP signaling in EoE.
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Que J. The initial establishment and epithelial morphogenesis of the esophagus: a new model of tracheal-esophageal separation and transition of simple columnar into stratified squamous epithelium in the developing esophagus. WILEY INTERDISCIPLINARY REVIEWS-DEVELOPMENTAL BIOLOGY 2015; 4:419-30. [PMID: 25727889 DOI: 10.1002/wdev.179] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 01/06/2015] [Accepted: 01/23/2015] [Indexed: 11/07/2022]
Abstract
The esophagus and trachea are tubular organs that initially share a single common lumen in the anterior foregut. Several models have been proposed to explain how this single-lumen developmental intermediate generates two tubular organs. However, new evidence suggests that these models are not comprehensive. I will first briefly review these models and then propose a novel 'splitting and extension' model based on our in vitro modeling of the foregut separation process. Signaling molecules (e.g., SHHs, WNTs, BMPs) and transcription factors (e.g., NKX2.1 and SOX2) are critical for the separation of the foregut. Intriguingly, some of these molecules continue to play essential roles during the transition of simple columnar into stratified squamous epithelium in the developing esophagus, and they are also closely involved in epithelial maintenance in the adults. Alterations in the levels of these molecules have been associated with the initiation and progression of several esophageal diseases and cancer in adults.
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Affiliation(s)
- Jianwen Que
- Department of Biomedical Genetics, University of Rochester, Rochester, NY, USA
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Volckaert T, De Langhe SP. Wnt and FGF mediated epithelial-mesenchymal crosstalk during lung development. Dev Dyn 2014; 244:342-66. [PMID: 25470458 DOI: 10.1002/dvdy.24234] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 11/20/2014] [Accepted: 11/26/2014] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND The adaptation to terrestrial life required the development of an organ capable of efficient air-blood gas exchange. To meet the metabolic load of cellular respiration, the mammalian respiratory system has evolved from a relatively simple structure, similar to the two-tube amphibian lung, to a highly complex tree-like system of branched epithelial airways connected to a vast network of gas exchanging units called alveoli. The development of such an elaborate organ in a relatively short time window is therefore an extraordinary feat and involves an intimate crosstalk between mesodermal and endodermal cell lineages. RESULTS This review describes the molecular processes governing lung development with an emphasis on the current knowledge on the role of Wnt and FGF signaling in lung epithelial differentiation. CONCLUSIONS The Wnt and FGF signaling pathways are crucial for the dynamic and reciprocal communication between epithelium and mesenchyme during lung development. In addition, some of this developmental crosstalk is reemployed in the adult lung after injury to drive regeneration, and may, when aberrantly or chronically activated, result in chronic lung diseases. Novel insights into how the Wnt and FGF pathways interact and are integrated into a complex gene regulatory network will not only provide us with essential information about how the lung regenerates itself, but also enhance our understanding of the pathogenesis of chronic lung diseases, as well as improve the controlled differentiation of lung epithelium from pluripotent stem cells.
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Affiliation(s)
- Thomas Volckaert
- Department of Pediatrics, Division of Cell Biology, National Jewish Health, Denver, Colorado; The Inflammation Research Center, Unit of Molecular Signal Transduction in Inflammation, VIB, Technologiepark 927, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, Technologiepark 927, 9052 Ghent, Belgium
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Billmyre KK, Hutson M, Klingensmith J. One shall become two: Separation of the esophagus and trachea from the common foregut tube. Dev Dyn 2014; 244:277-88. [PMID: 25329576 DOI: 10.1002/dvdy.24219] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 10/14/2014] [Accepted: 10/14/2014] [Indexed: 12/23/2022] Open
Abstract
The alimentary and respiratory organ systems arise from a common endodermal origin, the anterior foregut tube. Formation of the esophagus from the dorsal region and the trachea from the ventral region of the foregut primordium occurs by means of a poorly understood compartmentalization process. Disruption of this process can result in severe birth defects, such as esophageal atresia and tracheo-esphageal fistula (EA/TEF), in which the lumina of the trachea and esophagus remain connected. Here we summarize the signaling networks known to be necessary for regulating dorsoventral patterning within the common foregut tube and cellular behaviors that may occur during normal foregut compartmentalization. We propose that dorsoventral patterning serves to establish a lateral region of the foregut tube that is capable of undergoing specialized cellular rearrangements, culminating in compartmentalization. We review established as well as new rodent models that may be useful in addressing this hypothesis. Finally, we discuss new experimental models that could help elucidate the mechanism behind foregut compartmentalization. An integrated approach to future foregut morphogenesis research will allow for a better understanding of this complex process.
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Schilders K, Ochieng JK, van de Ven CP, Gontan C, Tibboel D, Rottier RJ. Role of SOX2 in foregut development in relation to congenital abnormalities. World J Med Genet 2014; 4:94-104. [DOI: 10.5496/wjmg.v4.i4.94] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 07/14/2014] [Accepted: 09/10/2014] [Indexed: 02/06/2023] Open
Abstract
The uptake of the two essential ingredients for life, oxygen and nutrients, occurs primarily through the oral cavity, but these two lifelines need to be separated with high accuracy once inside the body. The two systems, the gas exchange pulmonary system and the gastro-intestinal feeding system, are derived from the same primitive embryonic structure during development, the foregut, which need to be separated before birth. In certain newborns, this separation occurs not or insufficiently, leading to life threatening conditions, sometimes incompatible with life. The development of the foregut, trachea and lungs is influenced and coordinated by a multitude of signaling cascades and transcription factors. In this review, we will highlight the development of the foregut and pulmonary system and focus on associated congenital abnormalities in light of known genetic alterations with specific attention to the transcription factor SOX2.
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Fausett SR, Brunet LJ, Klingensmith J. BMP antagonism by Noggin is required in presumptive notochord cells for mammalian foregut morphogenesis. Dev Biol 2014; 391:111-24. [PMID: 24631216 DOI: 10.1016/j.ydbio.2014.02.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Revised: 01/21/2014] [Accepted: 02/10/2014] [Indexed: 01/05/2023]
Abstract
Esophageal atresia with tracheoesophageal fistula (EA/TEF) is a serious human birth defect, in which the esophagus ends before reaching the stomach, and is aberrantly connected with the trachea. Several mouse models of EA/TEF have recently demonstrated that proper dorsal/ventral (D/V) patterning of the primitive anterior foregut endoderm is essential for correct compartmentalization of the trachea and esophagus. Here we elucidate the pathogenic mechanisms underlying the EA/TEF that occurs in mice lacking the BMP antagonist Noggin, which display correct dorsal/ventral patterning. To clarify the mechanism of this malformation, we use spatiotemporal manipulation of Noggin and BMP receptor 1A conditional alleles during foregut development. Surprisingly, we find that the expression of Noggin in the compartmentalizing endoderm is not required to generate distinct tracheal and esophageal tubes. Instead, we show that Noggin and BMP signaling attenuation are required in the early notochord to correctly resolve notochord cells from the dorsal foregut endoderm, which in turn, appears to be a prerequisite for foregut compartmentalization. Collectively, our findings support an emerging model for a mechanism underlying EA/TEF in which impaired notochord resolution from the early endoderm causes the foregut to be hypo-cellular just prior to the critical period of compartmentalization. Our further characterizations suggest that Noggin may regulate a cell rearrangement process that involves reciprocal E-cadherin and Zeb1 expression in the resolving notochord cells.
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Affiliation(s)
- Sarah R Fausett
- Department of Cell Biology, Duke University Medical Center, Durham, NC, United States
| | - Lisa J Brunet
- Department of Molecular & Cell Biology, University of California Berkeley, Berkeley, CA, United States
| | - John Klingensmith
- Department of Cell Biology, Duke University Medical Center, Durham, NC, United States.
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Fragoso AC, Martinez L, Estevão-Costa J, Tovar JA. Maternal hyperthyroidism increases the prevalence of foregut atresias in fetal rats exposed to adriamycin. Pediatr Surg Int 2014; 30:151-7. [PMID: 24363086 DOI: 10.1007/s00383-013-3445-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
PURPOSE Gastrointestinal malformations such as esophageal atresia with tracheoesophageal fistula (EA/TEF) and duodenal atresia (DA) have been reported in infants born to hyperthyroid mothers or with congenital hypothyroidism. The present study aimed to test whether maternal thyroid status during embryonic foregut division has any influence on the prevalence of EA/TEF and DA in an accepted rat model of these malformations. METHODS Pregnant rats received either vehicle or 1.75 mg/kg i.p. adriamycin on gestational days 7, 8 and 9. Transient maternal hyper or hypothyroidism was induced by oral administration of levothyroxine (LT4, 50 μg/kg/day) or propylthiouracil (PTU, 2 mg/kg/day), respectively, on days 7 to 12 of gestation. Plasma cholesterol, total T3, free T4 and TSH were measured at gestational days 7, 12, and 21. At the end of gestation, the mothers were sacrificed and embryo-fetal mortality was recorded. Fetuses were dissected to determine the prevalence of esophageal and intestinal atresias. RESULTS At gestational day 12, mothers treated with LT4 or PTU had hyper or hypothyroid status, respectively; plasma cholesterol levels were similar. In the adriamycin-exposed fetuses from hyperthyroid mothers, the embryonal resorption rate and the prevalence of both EA/TEF and DA were significantly higher than in the other groups; maternal hypothyroidism during the same period did not have significant effect on the prevalence of atresias. CONCLUSIONS Maternal hyperthyroidism during the embryonic window corresponding to foregut cleavage increased the prevalence of both EA/TEF and duodenal atresia in fetal rats exposed to adriamycin. This suggests that maternal thyroid hormone status might be involved in the pathogenesis of foregut atresias and invites further research on this likely clinically relevant issue in humans.
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Affiliation(s)
- Ana Catarina Fragoso
- INGEMM and IdiPaz Research Laboratory, Department of Pediatric Surgery, Hospital Universitario La Paz, 28046, Madrid, Spain
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Fragoso AC, Tovar JA. The multifactorial origin of respiratory morbidity in patients surviving neonatal repair of esophageal atresia. Front Pediatr 2014; 2:39. [PMID: 24829898 PMCID: PMC4017156 DOI: 10.3389/fped.2014.00039] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 04/20/2014] [Indexed: 12/18/2022] Open
Abstract
Esophageal atresia with or without tracheoesophageal fistula (EA ± TEF) occurs in 1 out of every 3000 births. Current survival approaches 95%, and research is therefore focused on morbidity and health-related quality of life issues. Up to 50% of neonates with EA ± TEF have one or more additional malformations including those of the respiratory tract that occur in a relatively high proportion of them and particularly of those with vertebral, anal, cardiac, tracheoesophageal, renal, and limb association. Additionally, a significant proportion of survivors suffer abnormal pulmonary function and chronic respiratory tract disease. The present review summarizes the current knowledge about the nature of these symptoms in patients treated for EA ± TEF, and explores the hypothesis that disturbed development and maturation of the respiratory tract could contribute to their pathogenesis.
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Affiliation(s)
- Ana Catarina Fragoso
- INGEMM and Idipaz Research Laboratory, Department of Pediatric Surgery, Hospital Universitario La Paz , Madrid , Spain ; Department of Pediatrics, Universidad Autonoma de Madrid , Madrid , Spain ; Faculty of Medicine, University of Porto , Porto , Portugal
| | - Juan A Tovar
- INGEMM and Idipaz Research Laboratory, Department of Pediatric Surgery, Hospital Universitario La Paz , Madrid , Spain ; Department of Pediatrics, Universidad Autonoma de Madrid , Madrid , Spain
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Abstract
BACKGROUND Adriamycin mouse model (AMM) is a model of VACTERL anomalies. Sonic hedgehog (Shh) pathway, sourced by the notochord, is implicated of anorectal malformations. We hypothesized hindgut anomalies observed in the AMM are the result of abnormal effect of the notochord. METHODS Time-mated CBA/Ca mice received two intraperitoneal injections of Adriamycin (6 mg/kg) or saline as control on embryonic day (E) 7 and 8. Fetuses were harvested from E9 to E11, stained following whole mount in situ hybridization with labeled RNA probes to detect Shh and Fork head box F1(Foxf1) transcripts. Immunolocalization with endoderm marker Hnf3β was used to visualize morphology. Embryos were scanned by OPT to obtain 3D representations of expressions. RESULTS In AMM, the notochord was abnormally displaced ventrally with attachment to the hindgut endoderm in 71 % of the specimens. In 32 % of the treated embryos abnormal hindgut ended blindly in a cystic structure, and both of types were remarked in 29 % of treated embryos. Endodermal Shh and mesenchymal Foxf1 genes expression were preserved around the hindgut cystic malformation. CONCLUSIONS The delamination of the developing notochord in the AMM is disrupted, which may influence signaling mechanisms from the notochord to the hindgut resulting in abnormal patterning of the hindgut.
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Mc Laughlin D, Hajduk P, Murphy P, Puri P. Adriamycin-Induced Models of VACTERL Association. Mol Syndromol 2013; 4:46-62. [PMID: 23653576 DOI: 10.1159/000345579] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Animal models are of great importance for medical research. They have enabled analysis of the aetiology and pathogenesis of complex congenital malformations and have also led to major advances in the surgical and therapeutic management of these conditions. Animal models allow us to comprehend the morphological and molecular basis of disease and consequently to discover novel approaches for both surgical and medical therapy. The anthracycline antibiotic adriamycin was incidentally found to have teratogenic effects on rats, producing a range of defects remarkably similar to the VACTERL association of congenital anomalies in humans, providing a reproducible animal model of this condition. VACTERL association is a spectrum of birth defects which includes vertebral, anal, cardiovascular, tracheo-oesophageal, renal and limb anomalies. In recent years, adriamycin rodent models of VACTERL have provided valuable insights into the pathogenesis of this complex association, particularly in relation to tracheo-oesophageal malformations. The adriamycin rat model and adriamycin mouse model are now well established in the investigation of the morphology of faulty organogenesis and the regulation of gene expression in tracheo-oesophageal anomalies.
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Affiliation(s)
- D Mc Laughlin
- National Children's Research Centre, Our Lady's Children's Hospital, Dublin, Ireland ; Children's University Hospital, Dublin, Ireland ; School of Natural Sciences, Trinity College Dublin, Dublin, Ireland
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Domyan ET, Branchfield K, Gibson DA, Naiche L, Lewandoski M, Tessier-Lavigne M, Ma L, Sun X. Roundabout receptors are critical for foregut separation from the body wall. Dev Cell 2013; 24:52-63. [PMID: 23328398 PMCID: PMC3551250 DOI: 10.1016/j.devcel.2012.11.018] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 10/27/2012] [Accepted: 11/27/2012] [Indexed: 01/08/2023]
Abstract
In mammals, precise placement of organs is essential for survival. We show here that inactivation of Roundabout (Robo) receptors 1 and 2 in mice leads to mispositioning of the stomach in the thoracic instead of the abdominal cavity, which likely contributes to poor lung inflation and lethality at birth, reminiscent of congenital diaphragmatic hernia (CDH) cases in humans. Unexpectedly, in Robo mutant mice, the primary defect preceding organ misplacement and diaphragm malformation is a delayed separation of foregut from the dorsal body wall. Foregut separation is a rarely considered morphogenetic event, and our data indicate that it occurs via repulsion of Robo-expressing foregut cells away from the Slit ligand source. In humans, genomic lesions containing Robo genes have been documented in CDH. Our findings suggest that separation of the foregut from the body wall is genetically controlled and that defects in this event may contribute to CDH.
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Affiliation(s)
- Eric Thomas Domyan
- Laboratory of Genetics, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Kelsey Branchfield
- Laboratory of Genetics, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Daniel A. Gibson
- Department of Cell and Neurobiology, Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, CA 90033, USA
| | - L.A. Naiche
- Cancer and Developmental Biology Lab, National Cancer Institute, Frederick, MD 21702, USA
| | - Mark Lewandoski
- Cancer and Developmental Biology Lab, National Cancer Institute, Frederick, MD 21702, USA
| | | | - Le Ma
- Department of Cell and Neurobiology, Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, CA 90033, USA
| | - Xin Sun
- Laboratory of Genetics, University of Wisconsin-Madison, Madison, WI 53706, USA
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Jacobs IJ, Que J. Genetic and cellular mechanisms of the formation of esophageal atresia and tracheoesophageal fistula. Dis Esophagus 2013; 26:356-8. [PMID: 23679023 PMCID: PMC4321969 DOI: 10.1111/dote.12055] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Foregut separation involves dynamic changes in the activities of signaling pathways and transcription factors. Recent mouse genetic studies demonstrate that some of these pathways interact with each other to form a complex network, leading to a unique dorsal-ventral patterning in the early foregut. In this review, it is discussed how this unique dorsal-ventral patterning is set prior to the foregut separation and how disruption of this patterning affects the separation process. Roles of downstream targets of these pathways in regulating separation at cellular and molecular levels would be discussed further. Understanding the mechanism of normal separation process will provide insights into the pathobiology of a relatively common birth defect, esophageal atresia with/without tracheoesophageal fistula.
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Affiliation(s)
- Ian J. Jacobs
- Department of Biology, University of Rochester, Rochester, NY, 14642
| | - Jianwen Que
- Department of Biomedical Genetics, University of Rochester, Rochester, NY, 14642,UR Stem Cell and Regenerative Medicine Institute, Rochester, NY, 14642,Author for correspondence: , Department of Biomedical Genetics, University of Rochester, 601 Elmwood Ave., Box 633, Rochester, NY 14642, Phone: 585-273-4125, Fax: 585-273-1450
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Osborn MF, Buchanan BK, Akle N, Badr A, Zhang J. Embryologic Association of Tornwaldt's Cyst with Cerebral Artery Abnormalities and Infarction: A Case Report. Case Rep Pediatr 2012; 2012:129503. [PMID: 23094173 PMCID: PMC3472527 DOI: 10.1155/2012/129503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Accepted: 09/16/2012] [Indexed: 11/17/2022] Open
Abstract
Background and Purpose. Tornwaldt's cysts are rare nasopharyngeal lesions that develop from remnants of the embryonic notochord. Summary of Case. We reported a twelve-year-old female stroke patient with Tornwaldt's cysts, whose father also suffered a stroke at age fifty two with the presence of an abdominal aortic aneurysm, suggesting a genetic influence in this case. Conclusions. This paper suggests an etiologic connection between Tornwaldt's cysts and cerebral vasculature abnormalities by way of notochordal dysfunction during development, likely the result of perturbation of notochord-derived molecular cues during development or biogenesis.
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Affiliation(s)
- Michael F. Osborn
- COE in Neurosciences and Departments of Anesthesiology and Biomedical Sciences, Texas Tech University Health Science Center, El Paso, TX 79905, USA
| | - Benjamin K. Buchanan
- COE in Neurosciences and Departments of Anesthesiology and Biomedical Sciences, Texas Tech University Health Science Center, El Paso, TX 79905, USA
| | - Nassim Akle
- Department of Radiology, Texas Tech University Health Science Center, El Paso, TX 79905, USA
| | - Ahmed Badr
- COE in Neurosciences and Departments of Anesthesiology and Biomedical Sciences, Texas Tech University Health Science Center, El Paso, TX 79905, USA
| | - Jun Zhang
- COE in Neurosciences and Departments of Anesthesiology and Biomedical Sciences, Texas Tech University Health Science Center, El Paso, TX 79905, USA
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Garrido-Allepuz C, González-Lamuño D, Ros MA. Sirenomelia phenotype in bmp7;shh compound mutants: a novel experimental model for studies of caudal body malformations. PLoS One 2012; 7:e44962. [PMID: 23028704 PMCID: PMC3444499 DOI: 10.1371/journal.pone.0044962] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2012] [Accepted: 08/10/2012] [Indexed: 12/16/2022] Open
Abstract
Sirenomelia is a severe congenital malformation of the lower body characterized by the fusion of the legs into a single lower limb. This striking external phenotype consistently associates severe visceral abnormalities, most commonly of the kidneys, intestine, and genitalia that generally make the condition lethal. Although the causes of sirenomelia remain unknown, clinical studies have yielded two major hypotheses: i) a primary defect in the generation of caudal mesoderm, ii) a primary vascular defect that leaves the caudal part of the embryo hypoperfused. Interestingly, Sirenomelia has been shown to have a genetic basis in mice, and although it has been considered a sporadic condition in humans, recently some possible familial cases have been reported. Here, we report that the removal of one or both functional alleles of Shh from the Bmp7-null background leads to a sirenomelia phenotype that faithfully replicates the constellation of external and internal malformations, typical of the human condition. These mutants represent an invaluable model in which we have analyzed the pathogenesis of sirenomelia. We show that the signaling defect predominantly impacts the morphogenesis of the hindgut and the development of the caudal end of the dorsal aortas. The deficient formation of ventral midline structures, including the interlimb mesoderm caudal to the umbilicus, leads to the approximation and merging of the hindlimb fields. Our study provides new insights for the understanding of the mechanisms resulting in caudal body malformations, including sirenomelia.
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Affiliation(s)
- Carlos Garrido-Allepuz
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC), CSIC-SODERCAN-Universidad de Cantabria, Santander, Spain
| | - Domingo González-Lamuño
- Instituto de Formación e Investigación Marqués de Valdecilla (IFIMAV) and División de Pediatría, Hospital Marqués de Valdecilla-Universidad de Cantabria, Santander, Spain
| | - Maria A. Ros
- Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC), CSIC-SODERCAN-Universidad de Cantabria, Santander, Spain
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Jacobs IJ, Ku WY, Que J. Genetic and cellular mechanisms regulating anterior foregut and esophageal development. Dev Biol 2012; 369:54-64. [PMID: 22750256 DOI: 10.1016/j.ydbio.2012.06.016] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2012] [Revised: 06/07/2012] [Accepted: 06/20/2012] [Indexed: 12/22/2022]
Abstract
Separation of the single anterior foregut tube into the esophagus and trachea involves cell proliferation and differentiation, as well as dynamic changes in cell-cell adhesion and migration. These biological processes are regulated and coordinated at multiple levels through the interplay of the epithelium and mesenchyme. Genetic studies and in vitro modeling have shed light on relevant regulatory networks that include a number of transcription factors and signaling pathways. These signaling molecules exhibit unique expression patterns and play specific functions in their respective territories before the separation process occurs. Disruption of regulatory networks inevitably leads to defective separation and malformation of the trachea and esophagus and results in the formation of a relatively common birth defect, esophageal atresia with or without tracheoesophageal fistula (EA/TEF). Significantly, some of the signaling pathways and transcription factors involved in anterior foregut separation continue to play important roles in the morphogenesis of the individual organs. In this review, we will focus on new findings related to these different developmental processes and discuss them in the context of developmental disorders or birth defects commonly seen in clinics.
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Affiliation(s)
- Ian J Jacobs
- Department of Biology, University of Rochester, Rochester, NY 14642, USA
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Yuen HF, McCrudden CM, Grills C, Zhang SD, Huang YH, Chan KK, Chan YP, Wong MLY, Law S, Srivastava G, Fennell DA, Dickson G, El-Tanani M, Chan KW. Combinatorial use of bone morphogenetic protein 6, noggin and SOST significantly predicts cancer progression. Cancer Sci 2012; 103:1145-54. [PMID: 22364398 PMCID: PMC7685053 DOI: 10.1111/j.1349-7006.2012.02252.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 02/17/2012] [Accepted: 02/20/2012] [Indexed: 12/15/2022] Open
Abstract
Emerging evidence has indicated a role of the bone morphogenetic proteins (BMP) in the pathogenesis of certain cancers. The signaling of BMP family members is tightly regulated by their antagonists, including noggin and SOST, which are, in turn, positively regulated by BMP, thereby forming a negative feedback loop. Consequently, the expression of these antagonists should be taken into account in studies on the prognostic significance of BMP. In the present paper, we correlated protein and mRNA expression levels of BMP6, noggin and SOST, alone or in combination, with patient survival in various types of cancer. We found that BMP6 alone was not significantly correlated with esophageal squamous cell carcinoma patient survival. Instead, a high level of inhibitor of differentiation 1, a downstream factor of BMP6, was associated with shorter survival in patients whose tumors stained strongly for BMP6. Knockdown of noggin in esophageal cancer cell line EC109, which expresses BMP6 strongly and SOST weakly, enhanced the non-adherent growth of the cells. Noggin and SOST expression levels, when analyzed alone, were not significantly correlated with patient survival. However, high BMP6 activity, defined by strong BMP6 expression coupled with weak noggin or SOST expression, was significantly associated with shorter survival in esophageal squamous cell carcinoma patients. We further confirmed that BMP6 activity could be used as a prognostic indicator in prostate, bladder and colorectal cancers, using publicly available data on BMP6, noggin and SOST mRNA expression and patient survival. Our results strongly suggest that BMP6, noggin and SOST could be used in combination as a prognostic indicator in cancer progression.
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Affiliation(s)
- Hiu-Fung Yuen
- Centre for Cancer Research and Cell Biology, Queen's University Belfast, Belfast, UK.
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Howell JC, Wells JM. Generating intestinal tissue from stem cells: potential for research and therapy. Regen Med 2012; 6:743-55. [PMID: 22050526 DOI: 10.2217/rme.11.90] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Intestinal resection and malformations in adult and pediatric patients result in devastating consequences. Unfortunately, allogeneic transplantation of intestinal tissue into patients has not been met with the same measure of success as the transplantation of other organs. Attempts to engineer intestinal tissue in vitro include disaggregation of adult rat intestine into subunits called organoids, harvesting native adult stem cells from mouse intestine and spontaneous generation of intestinal tissue from embryoid bodies. Recently, by utilizing principles gained from the study of developmental biology, human pluripotent stem cells have been demonstrated to be capable of directed differentiation into intestinal tissue in vitro. Pluripotent stem cells offer a unique and promising means to generate intestinal tissue for the purposes of modeling intestinal disease, understanding embryonic development and providing a source of material for therapeutic transplantation.
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Affiliation(s)
- Jonathan C Howell
- Division of Endocrinology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229-3039, USA
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Mutational analysis of NOG in esophageal atresia and tracheoesophageal fistula patients. Pediatr Surg Int 2012; 28:335-40. [PMID: 22083168 PMCID: PMC4148071 DOI: 10.1007/s00383-011-3022-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/02/2011] [Indexed: 10/15/2022]
Abstract
PURPOSE The NOG protein is a secretory antagonist of bone morphogenetic proteins (BMPs). Nog-/- mouse embryos demonstrate proximal esophageal atresia (EA) and distal tracheoesophageal fistula (TEF) compatible with the most common configuration of EA/TEF observed in humans. Four microdeletions that span the NOG locus at 17q22 have been described in human patients having EA/TEF. We investigated the incidence of point mutations in the coding region of the NOG gene in human EA/TEF. METHODS DNA was collected from 50 patients previously treated for EA/TEF. PCR was used to amplify the coding region of NOG. To detect single nucleotide polymorphisms (SNPs), amplicons were subjected to temperature gradient capillary electrophoresis (TGCE). Candidate SNPs were directly sequenced. RESULTS TGCE analysis revealed a SNP in the coding region of NOG in 1 of 50 patients (2%). DNA sequencing revealed a synonymous SNP at position 468 (C-T) of the NOG coding region. CONCLUSION SNPs in the coding region of the NOG gene are identified infrequently in human cases of EA/TEF. Further investigation of SNPs in the promoter region of NOG is warranted, as is the effect of synonymous SNPs on NOG mRNA stability.
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Fausett SR, Klingensmith J. Compartmentalization of the foregut tube: developmental origins of the trachea and esophagus. WILEY INTERDISCIPLINARY REVIEWS-DEVELOPMENTAL BIOLOGY 2011; 1:184-202. [DOI: 10.1002/wdev.12] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Hajduk P, Sato H, Puri P, Murphy P. Abnormal notochord branching is associated with foregut malformations in the adriamycin treated mouse model. PLoS One 2011; 6:e27635. [PMID: 22132119 PMCID: PMC3221665 DOI: 10.1371/journal.pone.0027635] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Accepted: 10/20/2011] [Indexed: 12/22/2022] Open
Abstract
Oesophageal atresia (OA) and tracheooesophageal fistula (TOF) are relatively common human congenital malformations of the foregut where the oesophagus does not connect with the stomach and there is an abnormal connection between the stomach and the respiratory tract. They require immediate corrective surgery and have an impact on the future health of the individual. These abnormalities are mimicked by exposure of rat and mouse embryos in utero to the drug adriamycin. The causes of OA/TOF during human development are not known, however a number of mouse mutants where different signalling pathways are directly affected, show similar abnormalities, implicating multiple and complex signalling mechanisms. The similarities in developmental outcome seen in human infants and in the adriamycin treated mouse model underline the potential of this model to unravel the early embryological events and further our understanding of the processes disturbed, leading to such abnormalities. Here we report a systematic study of the foregut and adjacent tissues in embryos treated with adriamycin at E7 and E8 and analysed between E9 and E12, comparing morphology in 3D in 149 specimens. We describe a spectrum of 8 defects, the most common of which is ventral displacement and branching of the notochord (in 94% of embryos at E10) and a close spatial correspondence between the site of notochord branching and defects of the foregut. In addition gene expression analysis shows altered dorso-ventral foregut patterning in the vicinity of notochord branches. This study shows a number of features of the adriamycin mouse model not previously reported, implicates the notochord as a primary site of disturbance in such abnormalities and underlines the importance of the model to further address the mechanistic basis of foregut congenital abnormalities.
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Affiliation(s)
- Piotr Hajduk
- Zoology Department, School of Natural Sciences, University of Dublin, Trinity College, Dublin, Ireland
- National Children's Research Centre, Our Lady's Children's Hospital, Crumlin, Dublin, Ireland
| | - Hideaki Sato
- Zoology Department, School of Natural Sciences, University of Dublin, Trinity College, Dublin, Ireland
- National Children's Research Centre, Our Lady's Children's Hospital, Crumlin, Dublin, Ireland
| | - Prem Puri
- National Children's Research Centre, Our Lady's Children's Hospital, Crumlin, Dublin, Ireland
| | - Paula Murphy
- Zoology Department, School of Natural Sciences, University of Dublin, Trinity College, Dublin, Ireland
- * E-mail:
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Barx1-mediated inhibition of Wnt signaling in the mouse thoracic foregut controls tracheo-esophageal septation and epithelial differentiation. PLoS One 2011; 6:e22493. [PMID: 21799872 PMCID: PMC3142160 DOI: 10.1371/journal.pone.0022493] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Accepted: 06/24/2011] [Indexed: 12/24/2022] Open
Abstract
Mesenchymal cells underlying the definitive endoderm in vertebrate animals play a vital role in digestive and respiratory organogenesis. Although several signaling pathways are implicated in foregut patterning and morphogenesis, and despite the clinical importance of congenital tracheal and esophageal malformations in humans, understanding of molecular mechanisms that allow a single tube to separate correctly into the trachea and esophagus is incomplete. The homoebox gene Barx1 is highly expressed in prospective stomach mesenchyme and required to specify this organ. We observed lower Barx1 expression extending contiguously from the proximal stomach domain, along the dorsal anterior foregut mesenchyme and in mesenchymal cells between the nascent esophagus and trachea. This expression pattern exactly mirrors the decline in Wnt signaling activity in late development of the adjacent dorsal foregut endoderm and medial mainstem bronchi. The hypopharynx in Barx1(-/-) mouse embryos is abnormally elongated and the point of esophago-tracheal separation shows marked caudal displacement, resulting in a common foregut tube that is similar to human congenital tracheo-esophageal fistula and explains neonatal lethality. Moreover, the Barx1(-/-) esophagus displays molecular and cytologic features of respiratory endoderm, phenocopying abnormalities observed in mouse embryos with activated ß-catenin. The zone of canonical Wnt signaling is abnormally prolonged and expanded in the proximal Barx1(-/-) foregut. Thus, as in the developing stomach, but distinct from the spleen, Barx1 control of thoracic foregut specification and tracheo-esophageal septation is tightly associated with down-regulation of adjacent Wnt pathway activity.
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Domyan ET, Ferretti E, Throckmorton K, Mishina Y, Nicolis SK, Sun X. Signaling through BMP receptors promotes respiratory identity in the foregut via repression of Sox2. Development 2011; 138:971-81. [PMID: 21303850 DOI: 10.1242/dev.053694] [Citation(s) in RCA: 148] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The mammalian foregut gives rise to the dorsally located esophagus and stomach and the ventrally located trachea and lung. Proper patterning and morphogenesis of the common foregut tube and its derived organs is essential for viability of the organism at birth. Here, we show that conditional inactivation of BMP type I receptor genes Bmpr1a and Bmpr1b (Bmpr1a;b) in the ventral endoderm leads to tracheal agenesis and ectopic primary bronchi. Molecular analyses of these mutants reveal a reduction of ventral endoderm marker NKX2-1 and an expansion of dorsal markers SOX2 and P63 into the prospective trachea and primary bronchi. Subsequent genetic experiments show that activation of canonical WNT signaling, previously shown to induce ectopic respiratory fate in otherwise wild-type mice, is incapable of promoting respiratory fate in the absence of Bmpr1a;b. Furthermore, we find that inactivation of Sox2 in Bmpr1a;b mutants does not suppress ectopic lung budding but does rescue trachea formation and NKX2-1 expression. Together, our data suggest that signaling through BMPR1A;B performs at least two roles in early respiratory development: first, it promotes tracheal formation through repression of Sox2; and second, it restricts the site of lung bud initiation.
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Affiliation(s)
- Eric T Domyan
- Laboratory of Genetics, University of Wisconsin-Madison, Madison, WI 53706, USA
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Domyan ET, Sun X. Patterning and plasticity in development of the respiratory lineage. Dev Dyn 2010; 240:477-85. [PMID: 21337460 DOI: 10.1002/dvdy.22504] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2010] [Indexed: 11/07/2022] Open
Abstract
The mammalian respiratory lineage, consisting of the trachea and lung, originates from the ventral foregut in an early embryo. Reciprocal signaling interactions between the foregut epithelium and its associated mesenchyme guide development of the respiratory endoderm, from a naive sheet of cells to multiple cell types that line a functional organ. This review synthesizes current understanding of the early events in respiratory system development, focusing on three main topics: (1) specification of the respiratory system as a distinct organ of the endoderm, (2) patterning and differentiation of the nascent respiratory epithelium along its proximal-distal axis, and (3) plasticity of the respiratory cells during the process of development. This review also highlights areas in need of further study, including determining how early endoderm cells rapidly switch their responses to the same signaling cues during development, and how the general proximal-distal pattern of the lung is converted to fine-scale organization of multiple cell types along this axis.
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Rodriguez P, Da Silva S, Oxburgh L, Wang F, Hogan BLM, Que J. BMP signaling in the development of the mouse esophagus and forestomach. Development 2010; 137:4171-6. [PMID: 21068065 DOI: 10.1242/dev.056077] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The stratification and differentiation of the epidermis are known to involve the precise control of multiple signaling pathways. By contrast, little is known about the development of the mouse esophagus and forestomach, which are composed of a stratified squamous epithelium. Based on prior work in the skin, we hypothesized that bone morphogenetic protein (BMP) signaling is a central player. To test this hypothesis, we first used a BMP reporter mouse line harboring a BRE-lacZ allele, along with in situ hybridization to localize transcripts for BMP signaling components, including various antagonists. We then exploited a Shh-Cre allele that drives recombination in the embryonic foregut epithelium to generate gain- or loss-of-function models for the Bmpr1a (Alk3) receptor. In gain-of-function (Shh-Cre;Rosa26(CAG-loxpstoploxp-caBmprIa)) embryos, high levels of ectopic BMP signaling stall the transition from simple columnar to multilayered undifferentiated epithelium in the esophagus and forestomach. In loss-of-function experiments, conditional deletion of the BMP receptor in Shh-Cre;Bmpr1a(flox/flox) embryos allows the formation of a multilayered squamous epithelium but this fails to differentiate, as shown by the absence of expression of the suprabasal markers loricrin and involucrin. Together, these findings suggest multiple roles for BMP signaling in the developing esophagus and forestomach.
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Affiliation(s)
- Pavel Rodriguez
- Department of Cell Biology, Duke University Medical Center, Durham, NC 27710, USA
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Felix JF, de Jong EM, Torfs CP, de Klein A, Rottier RJ, Tibboel D. Genetic and environmental factors in the etiology of esophageal atresia and/or tracheoesophageal fistula: an overview of the current concepts. ACTA ACUST UNITED AC 2009; 85:747-54. [PMID: 19452513 DOI: 10.1002/bdra.20592] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Esophageal atresia and/or tracheoesophageal fistula (EA/TEF) are severe congenital anomalies. Although recent years have brought significant improvement in clinical treatment, our understanding of the etiology of these defects is lagging. Many genes and genetic pathways have been implicated in the development of EA/TEF, but only a few genes have been shown to be involved in humans, in animals, or in both. Extrapolating data from animal models to humans is not always straightforward. Environmental factors may also carry a risk, but the mechanisms are yet to be elucidated. This review gives an overview of the current state of knowledge about both genetic and environmental risk factors in the etiology of EA/TEF.
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Affiliation(s)
- Janine F Felix
- Department of Pediatric Surgery, Erasmus MC-Sophia Children's Hospital, 3000 CB Rotterdam, the Netherlands
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