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pubmed-article:12798294pubmed:abstractTextVagal neural crest-derived precursors of the enteric nervous system colonize the bowel by descending within the enteric mesenchyme. Perpendicular secondary migration, toward the mucosa and into the pancreas, result, respectively, in the formation of submucosal and pancreatic ganglia. We tested the hypothesis that netrins guide these secondary migrations. Studies using RT-PCR, in situ hybridization, and immunocytochemistry indicated that netrins (netrins-1 and -3 mice and netrin-2 in chicks) and netrin receptors [deleted in colorectal cancer (DCC), neogenin, and the adenosine A2b receptor] are expressed by the fetal mucosal epithelium and pancreas. Crest-derived cells expressed DCC, which was developmentally regulated. Crest-derived cells migrated out of explants of gut toward cocultured cells expressing netrin-1 or toward cocultured explants of pancreas. Crest-derived cells also migrated inwardly toward the mucosa of cultured rings of bowel. These migrations were specifically blocked by antibodies to DCC and by inhibition of protein kinase A, which interferes with DCC signaling. Submucosal and pancreatic ganglia were absent at E12.5, E15, and P0 in transgenic mice lacking DCC. Netrins also promoted the survival/development of enteric crest-derived cells. The formation of submucosal and pancreatic ganglia thus involves the attraction of DCC-expressing crest-derived cells by netrins.lld:pubmed
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pubmed-article:12798294pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:12798294pubmed:articleTitleNetrins and DCC in the guidance of migrating neural crest-derived cells in the developing bowel and pancreas.lld:pubmed
pubmed-article:12798294pubmed:affiliationDepartment of Anatomy and Cell Biology, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.lld:pubmed
pubmed-article:12798294pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12798294pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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