University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Partial urethral obstruction of rabbit urinary bladder: stereological evidence that the increase in muscle content is mostly driven by changes in number, rather than size, of smooth muscle cells.

de Castro Sasahara, TH, Mayhew, TM, Rahal, SC, Fioretto, ET, Balieiro, JC and Ribeiro, AA (2007) Partial urethral obstruction of rabbit urinary bladder: stereological evidence that the increase in muscle content is mostly driven by changes in number, rather than size, of smooth muscle cells. J Anat, 210 (4). pp. 449-459.

Full text not available from this repository.

Abstract

The effects of partial urethral obstruction on the detrusor muscle of rabbit urinary bladder were investigated using stereological sampling and estimation tools. Twelve female Norfolk rabbits (2.5-3.0 kg body weight) were divided into four groups: 3, 7 and 12 weeks after surgical intervention to produce a standard partial obstruction and unobstructed controls. Following removal, bladder axes (craniocaudal, dorsoventral and laterolateral) and organ weights were recorded. Bladders were prepared for light microscopy by multistage random sampling procedures. Stereological methods were used to estimate the volume of muscle and the packing density and total number of myocyte nuclei in each bladder. We also estimated mean myocyte volume and the mean cross-sectional area and length of myocytes. Group comparisons were made by one-way analysis of variance. Changes in bladder axes were mainly laterolateral and craniocaudal. Mean bladder weight increased roughly six-fold by 3 weeks and 17-fold by 12 weeks and was accompanied, on average, by 12- and 33-fold increases in total muscle volume. These variables did not differ at 3 and 7 weeks post-obstruction. Increases in muscle content were not accompanied by changes in packing densities but were associated with increases in the total numbers of myocyte nuclei (13-fold by 3 weeks, 28-fold by 12 weeks). Mean myocyte volume did not vary significantly between groups but cells in obstructed groups were shorter and wider. These findings support the notion that partial outflow obstruction leads to an increase in the number, but not mean volume, of myocytes. If due solely to myocyte mitosis, the total of 43 x 10(8) cells found at 12 weeks could be generated by the original complement of 15 x 10(7) cells if an average of only 2.1 x 10(6) new cells was produced every hour. In reality, even this modest proliferation rate is unlikely to be achieved because myocyte proliferation rates are very low and it is possible that new myocytes can arise by differentiation of mesenchymal or other precursor cells.

Item Type: Article
Authors :
NameEmailORCID
de Castro Sasahara, THUNSPECIFIEDUNSPECIFIED
Mayhew, TMUNSPECIFIEDUNSPECIFIED
Rahal, SCUNSPECIFIEDUNSPECIFIED
Fioretto, ETUNSPECIFIEDUNSPECIFIED
Balieiro, JCUNSPECIFIEDUNSPECIFIED
Ribeiro, AAUNSPECIFIEDUNSPECIFIED
Date : April 2007
Identification Number : https://doi.org/10.1111/j.1469-7580.2007.00702.x
Uncontrolled Keywords : Animals, Cell Count, Cell Size, Female, Hyperplasia, Models, Animal, Myocytes, Smooth Muscle, Rabbits, Urethral Obstruction, Urinary Bladder
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 10:14
Last Modified : 17 May 2017 10:14
URI: http://epubs.surrey.ac.uk/id/eprint/826980

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800