Abstract
The enteric nervous system (ENS) forms from migrating neural crest-derived precursors that differentiate into neurons and glia, aggregate into ganglion cell clusters, and extend neuronal processes to form a complex interacting network that controls many aspects of intestinal function. Bone morphogenetic proteins (BMPs) have diverse roles in development and influence the differentiation, proliferation, and survival of ENS precursors. We hypothesized that BMP signaling might also be important for the ENS precursor migration, ganglion cell aggregation, and neurite fasciculation necessary to form the enteric nervous system. We now demonstrate that BMP signaling restricts murine ENS precursors to the outer bowel wall during migration. In addition, blocking BMP signaling causes faster colonization of the murine colon, reduces ganglion cell aggregation, and reduces neurite fasciculation. BMP signaling also influences patterns of neurite extension within the developing bowel wall. These effects on ENS precursor migration and neurite fasciculation appear to be mediated at least in part by increased polysialic acid addition to neural cell adhesion molecule (Ncam1) in response to BMP. Removing PSA enzymatically reverses the BMP effects on ENS precursor migration and neurite fasciculation. These studies demonstrate several novel roles for BMP signaling and highlight new functions for sialyltransferases in the developing ENS.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Body Patterning / drug effects
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Body Patterning / physiology*
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Bone Morphogenetic Protein 2
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Bone Morphogenetic Protein 4
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Bone Morphogenetic Proteins / genetics
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Bone Morphogenetic Proteins / metabolism*
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Bone Morphogenetic Proteins / pharmacology
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CD56 Antigen / genetics
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CD56 Antigen / metabolism*
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CHO Cells
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Carrier Proteins / genetics
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Cell Aggregation / drug effects
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Cell Movement* / drug effects
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Cell Polarity / drug effects
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Collagen / metabolism
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Colon / cytology
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Colon / drug effects
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Cricetinae
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Enteric Nervous System / cytology*
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Enteric Nervous System / drug effects
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Enteric Nervous System / metabolism
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Fasciculation
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Gels
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Glial Cell Line-Derived Neurotrophic Factor / pharmacology
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Mice
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Nerve Fibers / drug effects
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Neural Crest / cytology
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Neural Crest / drug effects
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Neurites / drug effects
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Neurites / physiology*
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Sialic Acids / metabolism
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Signal Transduction / drug effects
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Stem Cells / cytology
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Stem Cells / drug effects
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Transforming Growth Factor beta / metabolism*
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Transforming Growth Factor beta / pharmacology
Substances
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Bmp2 protein, mouse
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Bmp4 protein, mouse
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Bone Morphogenetic Protein 2
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Bone Morphogenetic Protein 4
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Bone Morphogenetic Proteins
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CD56 Antigen
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Carrier Proteins
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Gels
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Glial Cell Line-Derived Neurotrophic Factor
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Ncam1 protein, mouse
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Sialic Acids
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Transforming Growth Factor beta
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polysialic acid
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noggin protein
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Collagen