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Hypercompliant Apical Membranes of Bladder Umbrella Cells

Mathai, John C., Yu, Weiqun , Kim, Jae Hun , Zhou, Ge , Liao, Yi , Sun, Tung-Tien , Fredberg, Jeffrey J. and Zeidel, Mark L. (2014) Hypercompliant Apical Membranes of Bladder Umbrella Cells. Biophysical Journal, 107 (6). pp. 1273-1279. ISSN 00063495


Urinary bladder undergoes dramatic volume changes during filling and voiding cycles. In the bladder the luminal surface of terminally differentiated urothelial umbrella cells is almost completely covered by plaques. These plaques (500 to 1000 nm) are made of a family of proteins called uroplakins that are known to form a tight barrier to prevent leakage of water and solutes. Electron micrographs from previous studies show these plaques to be interconnected by hinge regions to form structures that appear rigid, but these same structures must accommodate large changes in cell shape during voiding and filling cycles. To resolve this paradox, we measured the stiffness of the intact, living urothelial apical membrane and found it to be highly deformable, even more so than the red blood cell membrane. The intermediate cells underlying the umbrella cells do
not have uroplakins but their membranes are an order of magnitude stiffer. Using uroplakin knockout mouse models we show that cell compliance is conferred by uroplakins. This hypercompliance may be essential for the maintenance of barrier function under dramatic cell deformation during filling and voiding of the bladder.

Item Type: Article
Date Deposited: 26 Apr 2016 23:45
Last Modified: 26 Apr 2016 23:45


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