Abstract
The effects of two growth factors, EGF and TGF beta 1, on growth and differentiation of different populations of urothelial cells in explant cultures of mouse urinary bladder have been studied by electron microscopy and lectin analysis. In an explant culture 10 days after the implantation three different populations of urothelial cells can be distinguished. Original urothelial cells, which are integral part of the explant, new urothelial cells, which cover the baso-lateral sides of the explant and are organized in a multilayer epithelium, and new urothelial cells, which are not any more in direct contact with the explant and grow over the membrane in epithelium-like structure. Exogenously added EGF or TGF beta 1 did not affect either the formation or the thickness of multilayered urothelium, so cells were proliferating on the free surfaces of stroma as well as on the epithelium expanding over the membrane. In the absence of growth factors in medium, the newly formed baso-lateral multilayered epithelium bordering the stroma shows ultrastructural signs of terminal differentiation suggesting that for cell proliferation and differentiation the action of stroma is of crucial importance. On the other hand, the differentiation of the ...Continue Reading
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