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- W2053841925 abstract "Experiments in which the developing gut of avian embryos was back-transplanted to permit the bowel to interact with the developing neural tube were undertaken. Segments of intestine from 4-day quail embryos were implanted between the somites and neural tubes of chick embryos of 7 to 24 somites. The spinal cord responded to the presence of the bowel by enlarging unilaterally on the side of the graft. This effect encompassed both gray and white matter and was accompanied by the extension of neuritic projections from the spinal cord into the enteric grafts. The growth-promoting effect of enteric transplants was manifest at all levels of the neural tube where the grafts were made and led to enlargement of the brain as well as the spinal cord; however, truncal neural crest derivatives in the region of the grafts, such as developing sympathetic and spinal ganglia, were unaffected. Neither sham operations nor grafts of ciliary ganglion, lung, pancreas, mesonephros, or rudiment of the eye mimicked the action of the gut. The effect of the bowel was manifest as early as 24 hr following back-transplantation and was found to be due to an increase in the number of cells in the neuroepithelium. The cell responsible for the ability of the gut wall to enhance neuroepithelial proliferation was not identified, but the effect lacked species specificity and could be elicited in the absence of endoderm or neural crest derivatives in the explant. We propose that the musculoconnective tissue of the gut produces a short-range diffusible factor that induces mitogenic activity in the neuroepithelial cells of the neural tube, but not in the crest cells that form sympathetic or sensory ganglia. Since the gut is not normally in apposition to the neural tube, we suggest that the physiological targets of this factor are the specialized crest cells that colonize the bowel and give rise to the enteric nervous system." @default.
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- W2053841925 date "1987-12-01" @default.
- W2053841925 modified "2023-09-25" @default.
- W2053841925 title "The effect of back-transplants of the embryonic gut wall on growth of the neural tube" @default.
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- W2053841925 doi "https://doi.org/10.1016/0012-1606(87)90486-6" @default.
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