Cell renewal in the epithelium of the alimentary tract of the larval lamprey, Petromyzon marinus L

Journal of Morphology
Susan J Hansen, J H Youson

Abstract

Light microscopic autoradiography with 3 H-thymidine demonstrates that the three regions of the alimentary tract in the larval (ammocoete) lamprey, Petromyzon marinus L., possess different patterns for renewing their epithelium. In the oesophagus, columnar and mucous cells originate from stem cells located at the bases of folds and migrate to the tops of the folds where they are apparently extruded. Ciliated cells, located only at the tops of the folds, seem to differentiate from migrating columnar cells. In the anterior intestine, stem cells are present throughout the epithelium so that there is limited migration of cells and their extrusion occurs randomly. In the posterior intestine, the stem cells located at the bases of the typhlosole provide a continuous population that differentiates and migrates to the top of the typhlosole and to the opposite epithelial wall where they are presumably extruded. The rates of cell renewal in all three epithelial regions of the alimentary tract are slower in animals maintained at 10 ± 1°C compared with those kept at 21 ± 1°C. Comparatively, ammocoetes have the least specialized system for cell renewal known in the alimentary tract of a vertebrate.

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Citations

May 1, 1983·Journal of Morphology·R W HilliardI C Potter
Feb 1, 1978·Journal of Morphology·Susan J Hansen, John H Youson
Sep 23, 2003·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·P L RamsayF J Demayo
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Jul 6, 2014·Clinical and Translational Medicine·Yuan Quan, Dachun Wang
Mar 14, 2012·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Abraham B RoosMagnus Nord
Aug 19, 2014·The Journal of Gene Medicine·Patricia CmielewskiDavid W Parsons
Nov 2, 2014·Journal of Cellular Biochemistry·Zhen-Guo ZhaoZheng-Tang Chen
Oct 10, 1998·European Journal of Clinical Investigation·B MüllerP J Barth

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