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Reuse of bladder mucosa explants provides a long lasting source of urothelial cells for the establishment of differentiated urothelia

Authors
  • Jerman, Urška Dragin1
  • Kreft, Mateja Erdani1
  • 1 University of Ljubljana, Institute of Cell Biology, Faculty of Medicine, Vrazov trg 2, Ljubljana, 1000, Slovenia , Ljubljana (Slovenia)
Type
Published Article
Journal
Histochemistry and Cell Biology
Publisher
Springer Berlin Heidelberg
Publication Date
Aug 09, 2018
Volume
150
Issue
5
Pages
567–574
Identifiers
DOI: 10.1007/s00418-018-1704-7
Source
Springer Nature
Keywords
License
Yellow

Abstract

Organ explant cultures are well-established in vitro models that are used to study normal cell biological and regeneration processes as well as carcinogenesis. Primary urothelial cultures from bladder mucosa explants are highly differentiated and are thus broadly used as in vitro experimental equivalents of native urothelial tissue. Since experiments on differentiated urothelial cultures from bladder mucosa explants currently allow only a single use of explants, establishment of sufficient quantities of cultures requires large numbers of sacrificed animals. There is thus a great need for a cheaper approach with less ethical dilemmas. Herein, we demonstrate that mouse bladder mucosa explants can be reused. Reused explants produce outgrowths with highly differentiated urothelia, just like primary explants. Even after being recycled ten times, urothelial outgrowths have the supramolecular and ultrastructural features that are comparable to the native urothelium. Ten times reused explants produce superficial urothelial cells that express uroplakins in the apical plasma membrane, claudin-8 in the tight junctions, and have a subapical network of cytokeratin 20. Basal urothelial cells in urothelial outgrowths of ten times reused explants express p63 which indicates that these urothelial outgrowths have a persistent proliferative capacity. Using our approach, one can perform experiments that were previously not feasible due to low quantities of donor tissue. The method also offers opportunity for effective use of scarce healthy human urothelial tissue.

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