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Updated: Jul 27, 2026

Urinary Bladder Distention Evoked Visceromotor Responses as a Model for Bladder Pain in Mice
Published on: April 27, 2014
Structural and functional responses of the bullfrog urinary bladder to distension caused by hydrostatic pressure
D F Stiffler1, K L Thornburg, R E Swanson
1Biological Sciences Department, California State Polytechnic University, Pomona, CA 91768, USA. dfstiffler@csuponoma.edu
Abstract:
The responses to mucosal pressure elevation (physiological pressure: PP) were compared to responses to serosal pressure elevation (non-physiological pressure: NPP) in bullfrog urinary bladders (Rana catesbeiana). The bladders were mounted on vertical chambers as flat sheets. Distension was applied with 98.07 Pa. pressure gradients. PP resulted in increases in transepithelial electrical potential difference (TEP) and short-circuit current (SCC). Electrical resistance (R), urea permeability (P(urea)) and net water flux (J( v)) were not effected. NPP resulted in decreases in TEP (38%), SCC (13%), and R (36%). While P(urea) (97%) and J(v) (96%) increased. PP caused little or no change in the electron microscopic structure of frog bladder while NPP caused irreversible dilation of the lateral intercellular spaces. There were no observable changes in tight junctions under PP or NPP. The subepithelial elements of the bladder became detached from the epithelial layer during NPP suggesting a role for them during PP.
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