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Contribution of the extracellular matrix to the viscoelastic behavior of the urinary bladder wall

Nagatomi, J and Toosi, KK and Chancellor, MB and Sacks, MS (2008) Contribution of the extracellular matrix to the viscoelastic behavior of the urinary bladder wall. Biomechanics and Modeling in Mechanobiology, 7 (5). 395 - 404. ISSN 1617-7959

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We previously reported that when the stress relaxation response of urinary bladder wall (UBW) tissue was analyzed using a single continuous reduced relaxation function (RRF), we observed non-uniformly distributed, time-dependent residuals (Ann Biomed Eng 32(10):1409-1419, 2004). We concluded that the single relaxation spectrum was inadequate and that a new viscoelastic model for bladder wall was necessary. In the present study, we report a new approach composed of independent RRFs for smooth muscle and the extracellular matrix components (ECM), connected through a stress-dependent recruitment function. In order to determine the RRF for the ECM component, biaxial stress relaxation experiments were first performed on decellularized extracellular matrix network of the bladder obtained from normal and spinal cord injured rats. While it was assumed that smooth muscle followed a single spectrum RRF, modeling the UBW ECM required a dual-Gaussian spectrum. Experimental results revealed that the ECM stress relaxation response was insensitive to the initial stress level. Thus, the average ECM RRF parameters were determined by fitting the average stress relaxation data. The resulting stress relaxation behavior of whole bladder tissue was modeled by combining the ECM RRF with the RRF for the smooth muscle component using an exponential recruitment function representing the recruitment of collagen fibers at higher stress levels. In summary, the present study demonstrated, for the first time, that stress relaxation response of bladder tissue can be better modeled when divided into the contributions of the extracellular matrix and smooth muscle components. This modeling approach is suitable for prediction of mechanical behaviors of the urinary bladder and other organs that exhibit rapid tissue remodeling (i.e., smooth muscle hypertrophy and altered ECM synthesis) under various pathological conditions. © 2007 Springer-Verlag.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Nagatomi, J
Toosi, KKkkt6@pitt.eduKKT14
Chancellor, MB
Sacks, MS
Centers: Other Centers, Institutes, Offices, or Units > Human Engineering Research Laboratories
Date: 1 October 2008
Date Type: Publication
Journal or Publication Title: Biomechanics and Modeling in Mechanobiology
Volume: 7
Number: 5
Page Range: 395 - 404
DOI or Unique Handle: 10.1007/s10237-007-0095-9
Schools and Programs: School of Health and Rehabilitation Sciences > Rehabilitation Science and Technology
Refereed: Yes
ISSN: 1617-7959
MeSH Headings: Animals; Elasticity; Extracellular Matrix--physiology; Female; Models, Biological; Muscle, Smooth--cytology; Muscle, Smooth--physiology; Muscle, Smooth--physiopathology; Rats; Rats, Sprague-Dawley; Reproducibility of Results; Stress, Mechanical; Urinary Bladder--cytology; Urinary Bladder--physiology; Urinary Bladder--physiopathology; Urinary Bladder, Neurogenic--etiology; Urinary Bladder, Neurogenic--physiopathology; Viscosity
PubMed ID: 17690929
Date Deposited: 15 Oct 2012 18:56
Last Modified: 05 Jan 2021 12:55


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