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Fujiwara N, Miyahara K, Lee D, Nakazawa-Tanaka N, Akazawa C, Hatano M, Pierro A, Yamataka A. A novel mouse model of intestinal neuronal dysplasia: visualization of the enteric nervous system. Pediatr Surg Int 2023; 39:298. [PMID: 37982893 DOI: 10.1007/s00383-023-05585-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/30/2023] [Indexed: 11/21/2023]
Abstract
PURPOSE Intestinal neuronal dysplasia (IND) is a congenital anomaly affecting gastrointestinal neural innervation, but the pathogenesis remains unclear. The homozygous Ncx/Hox11L.1 knockout (Ncx-/-) mice exhibit megacolon and enteric ganglia anomalies, resembling IND phenotypes. Sox10-Venus transgenic mouse were used to visualize enteric neural crest cells in real time. This study aims to establish a novel mouse model of Sox10-Venus+/Ncx-/- mouse to study the pathogenesis of IND. METHODS Sox10-Venus+/Ncx-/- (Ncx-/-) (n = 8) mice and Sox10-Venus+/Ncx+/+ controls (control) (n = 8) were euthanized at 4-5 weeks old, and excised intestines were examined with fluorescence microscopy. Immunohistochemistry was performed on tissue sections with neural marker Tuj1. RESULTS Ncx-/- mice exhibited dilated cecum and small intestine. Body weight of Ncx-/- mice was lower with higher ratio of small intestine length relative to body weight. The neural network (Sox10-Venus) was observed along the intestine wall in Ncx-/- and control mice without staining. Ectopic and increased expression of Tuj1 was observed in both small intestine and proximal colon of Ncx-/- mice. CONCLUSION This study has established a reliable animal model that exhibits characteristics similar to patients with IND. This novel mouse model can allow the easy visualization of ENS in a time- and cost-effective way to study the pathogenesis of IND.
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Affiliation(s)
- Naho Fujiwara
- Department of Pediatric General and Urogenital Surgery, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo, 113-8421, Japan.
- Division of General and Thoracic Surgery, The Hospital for Sick Children, Toronto, Canada.
| | - Katsumi Miyahara
- Laboratory of Morphology and Image Analysis, Biomedical Research Core Facilities, Juntendo University School of Medicine, Tokyo, Japan
| | - Dorothy Lee
- Division of General and Thoracic Surgery, The Hospital for Sick Children, Toronto, Canada
| | - Nana Nakazawa-Tanaka
- Department of Pediatric General and Urogenital Surgery, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo, 113-8421, Japan
| | - Chihiro Akazawa
- Intractable Disease Research Center, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan
| | - Masahiko Hatano
- Department Biomedical Science, Chiba University Graduate School of Medicine, Chiba, Japan
| | - Agostino Pierro
- Division of General and Thoracic Surgery, The Hospital for Sick Children, Toronto, Canada
| | - Atsuyuki Yamataka
- Department of Pediatric General and Urogenital Surgery, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo, 113-8421, Japan
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Angelini MC, Silva AME, Felix TF, Lapa RML, Terra SA, Rodrigues MAM, Ortolan EVP, Reis PP, Lourenção PLTA. Identification of potential molecular pathogenesis mechanisms modulated by microRNAs in patients with Intestinal Neuronal Dysplasia type B. Sci Rep 2019; 9:17673. [PMID: 31776429 PMCID: PMC6881445 DOI: 10.1038/s41598-019-54245-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 11/06/2019] [Indexed: 01/15/2023] Open
Abstract
This study proposed to determine global microRNA (miRNA) expression and miRNA-regulated pathways in Intestinal Neuronal Dysplasia type B (IND-B). Fifty patients (0-15 years old) with IND-B were included in the study. Peripheral blood samples were collected from all 50 patients and from 10 healthy asymptomatic children (controls). Rectal biopsies were collected from 29/50 patients; biopsy tissues were needle microdissected to isolate the different intestinal layers, for molecular analysis. Global miRNA expression was determined using TaqMan arrays. Correlation analysis between miRNA expression in plasma and biopsy samples as well as among tissues derived from the distinct intestinal layers was performed. Computational approaches were used for miRNA target prediction/identification of miRNA-regulated genes and enriched pathways biologically relevant to IND-B pathogenesis. miRNAs were statistically significantly deregulated (FC ≥ 2 and p ≤ 0.05) in submucosal and muscular layers: over-expressed (miR-146a and miR-146b) and under-expressed (miR-99a, miR-100, miR-130a, miR-133b, miR-145, miR-365, miR-374-5p, miR-451). Notably, let-7a-5p was highly over-expressed in patient plasma compared to healthy controls (FC = 17.4). In addition, miR-451 was significantly under-expressed in both plasma and all biopsy tissues from the same patients. Enriched pathways (p < 0.01) were axon guidance, nerve growth factor signalling, NCAM signalling for neurite out-growth, neuronal system and apoptosis. miRNA expression is deregulated in the submucosa and muscular layers of the rectum and detected in plasma from patients with IND-B. Biologically enriched pathways regulated by the identified miRNAs may play a role in IND-B disease pathogenesis, due to the activity related to the neurons of the enteric nervous system.
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Affiliation(s)
- Marcos C Angelini
- UNESP - São Paulo State University, Faculty of Medicine, Department of Surgery and Orthopedics, Botucatu, SP, Brazil
| | - Alana Maia E Silva
- UNESP - São Paulo State University, Faculty of Medicine, Department of Surgery and Orthopedics, Botucatu, SP, Brazil
| | - Tainara F Felix
- UNESP - São Paulo State University, Faculty of Medicine, Department of Surgery and Orthopedics, Botucatu, SP, Brazil
- UNESP - São Paulo State University, Faculty of Medicine, Experimental Research Unity (UNIPEX), Botucatu, SP, Brazil
| | - Rainer M L Lapa
- Institute of Livestock and Biotechnology, Laboratory of Molecular Physiology, Toribio Rodriguez de Mendoza National University, Amazonas, Peru
| | - Simone A Terra
- UNESP - São Paulo State University, Faculty of Medicine, Department of Pathology, Botucatu, SP, Brazil
| | - Maria A M Rodrigues
- UNESP - São Paulo State University, Faculty of Medicine, Department of Pathology, Botucatu, SP, Brazil
| | - Erika V P Ortolan
- UNESP - São Paulo State University, Faculty of Medicine, Department of Surgery and Orthopedics, Botucatu, SP, Brazil
| | - Patricia P Reis
- UNESP - São Paulo State University, Faculty of Medicine, Department of Surgery and Orthopedics, Botucatu, SP, Brazil
- UNESP - São Paulo State University, Faculty of Medicine, Experimental Research Unity (UNIPEX), Botucatu, SP, Brazil
| | - Pedro L T A Lourenção
- UNESP - São Paulo State University, Faculty of Medicine, Department of Surgery and Orthopedics, Botucatu, SP, Brazil.
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Moore SW. Advances in understanding functional variations in the Hirschsprung disease spectrum (variant Hirschsprung disease). Pediatr Surg Int 2017; 33:285-298. [PMID: 27988850 DOI: 10.1007/s00383-016-4038-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/05/2016] [Indexed: 12/11/2022]
Abstract
Hirschsprung disease (HSCR) is a fairly well understood congenital, genetically based functional obstruction due to the congenital absence of ganglion cells in the distal bowel. However, although over 90% of Hirschsprung cases conform to the normally accepted histological diagnostic criteria, it has become increasingly clear that in addition to HSCR, there is a group of functional disturbances relating to a number of other congenital neurodysplastic conditions causing some degree of gastrointestinal tract malfunction. Although these represent a variety of possibly separate conditions of the enteric nervous system, this spectrum it would appear to be also influenced by similar developmental processes. The term "variant Hirschsprung" is commonly used to describe these conditions, but ganglion cells are mostly present if abnormal in number and distribution. These conditions are a problem group being amongst the most difficult to diagnose and treat with possible practical and legal consequences. The problem appears to be possibly one of definition which has proven difficult in the relative paucity of normal values, especially when correlated to age and gestation. It is the purpose of this paper to review the current position on these conditions and to explore possible shared common pathogenetic and genetic mechanisms. This article explores those conditions where a similar pathogenetic mechanisms to HSCR can be demonstrated (e.g. hypoganglionosis) as well as other neural features, which appear to represent separate conditions possibly linked to certain syndromes.
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Affiliation(s)
- S W Moore
- Division of Paediatric Surgery, Faculty of Medicine, University of Stellenbosch, P.O. Box 19063, Tygerberg, 7505, South Africa.
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Toledo de Arruda Lourenção PL, Terra SA, Ortolan EVP, Rodrigues MAM. Intestinal neuronal dysplasia type B: A still little known diagnosis for organic causes of intestinal chronic constipation. World J Gastrointest Pharmacol Ther 2016; 7:397-405. [PMID: 27602240 PMCID: PMC4986395 DOI: 10.4292/wjgpt.v7.i3.397] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 04/14/2016] [Accepted: 05/07/2016] [Indexed: 02/06/2023] Open
Abstract
Intestinal neuronal dysplasia type B (IND-B) is a controversial entity among the gastrointestinal neuromuscular disorders. It may occur alone or associated with other neuropathies, such as Hirschsprung's disease (HD). Chronic constipation is the most common clinical manifestation of patients. IND-B primarily affects young children and mimics HD, but has its own histopathologic features characterized mainly by hyperplasia of the submucosal nerve plexus. Thus, IND-B should be included in the differential diagnoses of organic causes of constipation. In recent years, an increasing number of cases of IND-B in adults have also been described, some presenting severe constipation since childhood and others with the onset of symptoms at adulthood. Despite the intense scientific research in the last decades, there are still knowledge gaps regarding definition, pathogenesis, diagnostic criteria and therapeutic possibilities for IND-B. However, in medical practice, we continue to encounter patients with severe constipation or intestinal obstruction who undergo to diagnostic investigation for HD and their rectal biopsies present hyperganglionosis in the submucosal nerve plexus and other features, consistent with the diagnosis of IND-B. This review critically discusses aspects related to the disease definitions, pathophysiology and genetics, epidemiology distribution, clinical presentation, diagnostic criteria and therapeutic possibilities of this still little-known organic cause of intestinal chronic constipation.
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