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Evidence of nonuniformity in urothelium barrier function between the upper urinary tract and bladder

Williams, Nicholas A., Barnard, Luke, Allender, Chris J., Bowen, Jenna L. ORCID:, Gumbleton, Mark ORCID:, Harrah, Tim, Raja, Aditya and Joshi, Hrishi B. 2016. Evidence of nonuniformity in urothelium barrier function between the upper urinary tract and bladder. Journal of Urology 195 (3) , pp. 763-770. 10.1016/j.juro.2015.10.066

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Purpose We compared the relative permeability of upper urinary tract and bladder urothelium to mitomycin C. Materials and Methods Ex vivo porcine bladder, ureters and kidneys were dissected out and filled with 1 mg ml–1 mitomycin C. At 60 minutes the organs were emptied and excised tissue samples were sectioned parallel to the urothelium. Sectioned tissue was homogenized and extracted mitomycin C was quantified. Transurothelial permeation across the different urothelia was calculated by normalizing the total amount of drug extracted to the surface area of the tissue sample. Average mitomycin C concentrations at different tissue depths (concentration-depth profiles) were calculated by dividing the total amount of drug recovered by the total weight of tissue. Results Mitomycin C permeation across the ureteral urothelium was significantly greater than across the bladder and renal pelvis urothelium (9.07 vs 0.94 and 3.61 μg cm–2, respectively). Concentrations of mitomycin C in the ureter and kidney were markedly higher than those achieved in the bladder at all tissue depths. Average urothelial mitomycin C concentrations were greater than 6.5-fold higher in the ureter and renal pelvis than in the bladder. Conclusions To our knowledge we report for the first time that the upper urinary tract and bladder show differing permeability to a single drug. Ex vivo porcine ureter is significantly more permeable to mitomycin C than bladder urothelium and consequently higher mitomycin C tissue concentrations can be achieved after topical application. Data in this study correlate with the theory that mammalian upper tract urothelium represents a different cell lineage than that of the bladder and it is innately more permeable to mitomycin C.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Pharmacy
Uncontrolled Keywords: urinary bladder; kidney; ureter; urothelium; mitomycin
Publisher: Elsevier
ISSN: 0022-5347
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 6 October 2015
Last Modified: 17 Jul 2023 06:47

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