Blog
About

21
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Enteric nervous system development: migration, differentiation, and disease

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          The enteric nervous system (ENS) provides the intrinsic innervation of the bowel and is the most neurochemically diverse branch of the peripheral nervous system, consisting of two layers of ganglia and fibers encircling the gastrointestinal tract. The ENS is vital for life and is capable of autonomous regulation of motility and secretion. Developmental studies in model organisms and genetic studies of the most common congenital disease of the ENS, Hirschsprung disease, have provided a detailed understanding of ENS development. The ENS originates in the neural crest, mostly from the vagal levels of the neuraxis, which invades, proliferates, and migrates within the intestinal wall until the entire bowel is colonized with enteric neural crest-derived cells (ENCDCs). After initial migration, the ENS develops further by responding to guidance factors and morphogens that pattern the bowel concentrically, differentiating into glia and neuronal subtypes and wiring together to form a functional nervous system. Molecules controlling this process, including glial cell line-derived neurotrophic factor and its receptor RET, endothelin (ET)-3 and its receptor endothelin receptor type B, and transcription factors such as SOX10 and PHOX2B, are required for ENS development in humans. Important areas of active investigation include mechanisms that guide ENCDC migration, the role and signals downstream of endothelin receptor type B, and control of differentiation, neurochemical coding, and axonal targeting. Recent work also focuses on disease treatment by exploring the natural role of ENS stem cells and investigating potential therapeutic uses. Disease prevention may also be possible by modifying the fetal microenvironment to reduce the penetrance of Hirschsprung disease-causing mutations.

          Related collections

          Most cited references 224

          • Record: found
          • Abstract: found
          • Article: not found

          The glial nature of embryonic and adult neural stem cells.

          Glial cells were long considered end products of neural differentiation, specialized supportive cells with an origin very different from that of neurons. New studies have shown that some glial cells--radial glia (RG) in development and specific subpopulations of astrocytes in adult mammals--function as primary progenitors or neural stem cells (NSCs). This is a fundamental departure from classical views separating neuronal and glial lineages early in development. Direct visualization of the behavior of NSCs and lineage-tracing studies reveal how neuronal lineages emerge. In development and in the adult brain, many neurons and glial cells are not the direct progeny of NSCs, but instead originate from transit amplifying, or intermediate, progenitor cells (IPCs). Within NSCs and IPCs, genetic programs unfold for generating the extraordinary diversity of cell types in the central nervous system. The timing in development and location of NSCs, a property tightly linked to their neuroepithelial origin, appear to be the key determinants of the types of neurons generated. Identification of NSCs and IPCs is critical to understand brain development and adult neurogenesis and to develop new strategies for brain repair.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Pattern formation in the vertebrate neural tube: a sonic hedgehog morphogen-regulated transcriptional network.

            Neuronal subtype specification in the vertebrate neural tube is one of the best-studied examples of embryonic pattern formation. Distinct neuronal subtypes are generated in a precise spatial order from progenitor cells according to their location along the anterior-posterior and dorsal-ventral axes. Underpinning this organization is a complex network of multiple extrinsic and intrinsic factors. This review focuses on the molecular mechanisms and general strategies at play in ventral regions of the forming spinal cord, where sonic hedgehog-based morphogen signaling is a key determinant. We discuss recent advances in our understanding of these events and highlight unresolved questions.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Hirschsprung disease, associated syndromes and genetics: a review.

              Hirschsprung disease (HSCR, aganglionic megacolon) represents the main genetic cause of functional intestinal obstruction with an incidence of 1/5000 live births. This developmental disorder is a neurocristopathy and is characterised by the absence of the enteric ganglia along a variable length of the intestine. In the last decades, the development of surgical approaches has importantly decreased mortality and morbidity which allowed the emergence of familial cases. Isolated HSCR appears to be a non-Mendelian malformation with low, sex-dependent penetrance, and variable expression according to the length of the aganglionic segment. While all Mendelian modes of inheritance have been described in syndromic HSCR, isolated HSCR stands as a model for genetic disorders with complex patterns of inheritance. The tyrosine kinase receptor RET is the major gene with both rare coding sequence mutations and/or a frequent variant located in an enhancer element predisposing to the disease. Hitherto, 10 genes and five loci have been found to be involved in HSCR development.
                Bookmark

                Author and article information

                Affiliations
                1Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri; and
                2Department of Developmental, Regenerative, and Stem Cell Biology, Washington University School of Medicine, St. Louis, Missouri
                Author notes
                Address for reprint requests and other correspondence: R. O. Heuckeroth, Washington Univ. School of Medicine, Dept. of Pediatrics, 660 South Euclid Ave., Box 8208, St. Louis, MO 63110 (e-mail: heuckeroth@ 123456kids.wustl.edu ).
                Journal
                Am J Physiol Gastrointest Liver Physiol
                Am. J. Physiol. Gastrointest. Liver Physiol
                ajpgi
                ajpgi
                AJPGI
                American Journal of Physiology - Gastrointestinal and Liver Physiology
                American Physiological Society (Bethesda, MD )
                0193-1857
                1522-1547
                2 May 2013
                1 July 2013
                2 May 2013
                : 305
                : 1
                : G1-G24
                GI-00452-2012
                10.1152/ajpgi.00452.2012
                3725693
                23639815
                Copyright © 2013 the American Physiological Society

                Licensed under Creative Commons Attribution CC-BY 3.0: the American Physiological Society.

                Product
                Categories
                Review

                Comments

                Comment on this article