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Clinical significance of the reduction of UT-B expression in urothelial carcinoma of the bladder.

Pathol. Res. Pract.2014 Dec;210(12):799-803. Epub 2014 Oct 07
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摘要


Urea transporter B (UT-B) is a membrane protein and plays an important role in regulating urea concentration in bladder urothelial cells. It has been reported that UT-B gene mutations were related to bladder carcinogenesis, and UT-B deletion could induce DNA damage and apoptosis in bladder urothelium. However, the functions and clinical significance of UT-B in human bladder cancer remain unknown. The most common type of bladder cancer is urothelial carcinoma (UC). We hypothesized that UT-B expression was related to bladder UC progress. In this study, UT-B was detected using immunohistochemistry in 52 paraffin-embedded specimens of bladder UC and 10 normal urothelium specimens. The results showed that UT-B protein expression in UC tumor cells was significantly lower as compared with normal urothelial cells (P = 0.021). UT-B protein expression was significantly reduced with increasing histological grade (P = 0.010). UT-B protein expression in muscle-invasive stage was significantly lower than in non-muscle-invasive stage (P = 0.014). Taken together, our data suggest that the reduction or loss of UT-B expression may be related to the incidence, progression and invasiveness of bladder UC. UT-B may be a novel diagnostic or prognostic biomarker, as well as a potential therapeutic target in UC of the bladder.

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