Summary
During the metamorphosis of Alytes, the primary intestinal epithelium degenerates. Basal, undifferentiated cells aggregated in islets undergo frequent divisions, forming a second and transiently stratified epithelium. Its cells contain a granular endoplasmic reticulum which is arranged in flattened cavities, and numerous dictyosomes; little autolytic vacuoles and their altered derivations can also be observed. Near the lumen, the new cells occasionally contain great lytic inclusions the origin of which is discussed. At the end of metamorphosis, the final epithelium becomes unistratified and the lytic bodies disappear.
Résumé
Au cours de la métamorphose d'Alytes, l'épithélium intestinal primaire dégénère. A sa base des cellules embryonnaires groupées en ilôts se divisent activement en donnant un épithélium secondaire, transitoirement pluristratifié. Les cellules y possèdent un réticulum endoplasmique granulaire, organisé en cavités aplaties, et de nombreux dictyosomes; on y observe aussi de petites vacuoles autolytiques ainsi que leurs formes d'altération. Les cellules secondaires proches de la lumière contiennent parfois de grosses inclusions lytiques dont l'origine est discutée. En fin de métamorphose, l'épithélium définitif devient unistratifié et les corps lytiques disparaissent.
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Hourdry, J. Remaniements ultrastructuraux de l'épithélium intestinal chez la larve d'un amphibien anoure en métamorphose, Alytes obstetricans Laur. Z.Zellforsch. 101, 555–567 (1969). https://doi.org/10.1007/BF00335268
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DOI: https://doi.org/10.1007/BF00335268