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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
The study of Xenopus tropicalis testis-derived stem cells
 Nguyen, Thi Minh Xuan ; Krylov, Vladimír (advisor) ; Bartůněk, Petr (referee) ; Hovořáková, Mária (referee)
The study of Xenopus tropicalis testis-derived stem cells Nguyen Thi Minh Xuan Abstract The substances secreted by Sertoli cells (SCs) are crucial to determine male sex characteristics in embryos and regulate spermatogenesis in adulthood. The failure in SC maturation can cause sterility in men. Before puberty, SCs keep the ability to proliferate and have been considered as immature cells. They differ remarkably from mature cells in connection with their morphology and biochemical activity and thus they probably play a part in maintaining spermatogonia stem cells in an undifferentiated stage. The transient presence of cytokeratin in immature SCs has been reported in many species, but not in Xenopus yet. We investigated which molecules are expressing only in immature Sertoli cells of X. tropicalis testes. The regulation of cytokeratin and β-catenin was revealed by fluorescent immunostaining. Cytokeratin and membrane β-catenin co- expressed in X.tropicalis juvenile testes and in cultured SC progenitors, called XtiSCs, but they were absent in adulthood. There was no signal of cytokeratin in migrating SCs (pre-SCs) located outside the seminiferous tubules. The suppression of cytokeratin along with the breakdown of β-catenin-based cell contacts have been observed in XtiSCs after the treatment with a small...
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