Author/Editor		Erman, Andreja; Kerec Kos, Mojca; Žakelj, Simon; Resnik, Nataša; Romih, Rok; Veranič, Peter
Title		Correlative study of functional and structural regeneration of urothelium after chitosan-induced injury
Type		članek
Publication year		2013
ISSN		0948-6143 - Histochemistry and cell biology
Language		eng
Abstract		High transepithelial electrical resistance (TEER) demonstrates a functional permeability barrier of the normal urothelium, which is maintained by a layer of highly differentiated superficial cells. When the barrier is challenged, a quick regeneration is induced. We used side-by-side diffusion chambers as an ex vivo system to determine the time course of functional and structural urothelial regeneration after chitosan-induced injury. The exposure of the urothelium to chitosan caused a 60 % decrease in TEER, the exposure of undifferentiated urothelial cells to the luminal surface and leaky tight junctions. During the regeneration period (350 min), TEER recovered to control values after approximately 200 min, while structural regeneration continued until 350 min after injury. The tight junctions are the earliest and predominant component of the barrier to appear, while complete barrier regeneration is achieved by delayed superficial cell terminal differentiation. The barrier function and the structure of untreated urothelium were unaffected in side-by-side diffusion chambers for at least 6 h. The urinary bladder tissue excised from an animal thus retains the ability to maintain and restore the transepithelial barrier and cellular ultrastructure for a sufficient period to allow for studies of regeneration in ex vivo conditions.
Keywords		urothelium diffusion chamber transepithelial electrical resistance urotelij širjenje komore električna upornost