39 research outputs found
Measurement of several intestinal lysosomal hydrolase activities, through larval development of discoglossus pictus otth, anuran amphibian
Histogenetical phenomena in the intestinal epithelium of the tadpole of alytes obstetricans Laur
Enhanced c-myc gene expression during forelimb regenerative outgrowth in the young Xenopus laevis.
Variations of intestinal calcium absorption in adult frogs (Rana esculenta). Effect of lysine
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Germ cell-specific expression of a gene encoding eukaryotic translation elongation factor 1 alpha (eEF-1 alpha) and generation of eEF-1 alpha retropseudogenes in Xenopus laevis.
Histochemical study of some lysosomal hydrolases of the intestinal epithelium during the development of the tadpole of Discoglossus pictus Otth, anuran amphibian
Origin of the adult intestinal stem cells induced by thyroid hormone in Xenopus laevis
In the amphibian intestine during metamorphosis, de novo stem cells generate the adult epithelium analogous to the mammalian counterpart. Interestingly, to date the exact origin of these stem cells remains to be determined, making intestinal metamorphosis a unique model to study development of adult organ-specific stem cells. Here, to determine their origin, we made use of transgenic Xenopus tadpoles expressing green fluorescent protein (GFP) for recombinant organ cultures. The larval epithelium separated from the wild-type (Wt) or GFP transgenic (Tg) intestine before metamorphic climax was recombined with homologous and heterologous nonepithelial tissues and was cultivated in the presence of thyroid hormone, the causative agent of metamorphosis. In all kinds of recombinant intestine, adult progenitor cells expressing markers for intestinal stem cells such as sonic hedgehog became detectable and then differentiated into the adult epithelium expressing intestinal fatty acid binding-protein, a marker for absorptive cells. Notably, whenever the epithelium was derived from Tg intestine, both the adult progenitor/stem cells and their differentiated cells expressed GFP, whereas neither of them expressed GFP in the Wt-derived epithelium. Our results provide direct evidence that stem cells that generate the adult intestinal epithelium originate from the larval epithelium, through thyroid hormone-induced dedifferentiation.—Ishizuya-Oka, A., Hasebe, T., Buchholz, D. R., Kajita, M., Fu, L., Shi, Y.-B. The origin of the adult intestinal stem cells induced by thyroid hormone in Xenopus laevis