Comparative immunohistochemical characterization of interstitial cells in the urinary bladder of human, guinea pig and pig
Abstract
Interstitial cells (ICs) are thought to play a functional role in urinary bladder. Animal models are commonly used to elucidate bladder physiology and pathophysiology. However, inter-species comparative studies on ICs are rare. We therefore analyzed ICs and their distribution in the upper lamina propria (ULP), the deeper lamina propria (DLP) and the detrusor muscular layer (DET) of human, guinea pig (GP) and pig. Paraffin slices were examined by immunohistochemistry and 3D confocal immunofluorescence of the mesenchymal intermediate filament vimentin (VIM), alpha-smooth muscle actin (αSMA), platelet-derived growth factor receptor alpha (PDGFRα) and transient receptor potential cation channel A1 (TRPA1). Image stacks were processed for analysis using Huygens software; quantitative analysis was performed with Fiji macros. ICs were identified by immunoreactivity for VIM (excluding blood vessels). In all species ≥ 75% of ULP ICs were VIM+/PDGFRα+ and ≥ 90% were VIM+/TRPA1+. In human and pig ≥ 74% of ULP ICs were VIM+/αSMA+, while in GP the percentage differed significantly with only 37% VIM+/αSMA+ ICs. Additionally, over 90% of αSMA+ ICs were also TRPA1+ and PDGFRα+ in human, GP and pig. In all three species, TRPA1+ and PDGFRα+ ICs ...Continue Reading
References
Identification of interstitial cells of Cajal in human urinary bladder: concept of vesical pacemaker
Expression of P2X3 purinoceptors in suburothelial myofibroblasts of the normal human urinary bladder
Identification of PDGFRα positive populations of interstitial cells in human and guinea pig bladders
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