Alterations to the subepithelial layers of the larval alimentary tract during metamorphosis in the sea lamprey Petromyzon marinus,with emphasis on tissue interactions |
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Authors: | W. Mark Elliott J. H. Youson |
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Affiliation: | (1) Department of Zoology and Division of Life Sciences, Scarborough Campus, University of Toronto, 1265 Military Trail, M1C1A4 Scarborough, Ontario, Canada;(2) Present address: Pulmonary Research, Laboratory, St. Paul's Hospital, 1081 Burrard Street, V6Z1Y6 Vancouver, British Columbia, Canada |
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Abstract: | Light-microscopic histochemistry and conventional electron microscopy were used to study the changes to the subepithelial layers in the larval esophagus of the sea lamprey Petromyzon marinus during metamorphosis. During early stages of metamorphosis, smooth muscle cells of the muscularis mucosae and tunica muscularis dedifferentiate into myofibroblast-like cells, which make contact with the basal lamina of the overlying mucosal epithelium. During later stages, these myofibroblast-like cells redifferentiate into smooth muscle cells, reforming the muscularis mucosae and tunica muscularis. Alterations to the extracellular matrix occur concomitantly. |
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Keywords: | Metamorphosis Esophagus Intestine Subepithelial connective tissues Extracellular matrix Petromyzon marinus (Cyclostomata) |
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