Int Neurourol J.  2017 Dec;21(4):247-258. 10.5213/inj.1732774.387.

Near-Normalized Gene Expression Profiles in Bladder With Detrusor Overactivity in Rats With Bladder Outlet Obstruction After Deobstruction

• Lee T
• Lim US
• Kang DH
• Jung HD
• Kim H
• Choi BH
• Kang JH
• Yoon SM
• Park CS

• KMID: 2400892
• DOI: http://doi.org/10.5213/inj.1732774.387

Abstract

PURPOSE
The pathophysiological role of detrusor overactivity (DO) in the bladder, which is commonly observed in various bladder diseases, is not well understood. DO appears in bladder outlet obstruction (BOO), and may continue even after subsequent deobstruction. DO therefore provides an excellent opportunity to observe molecular biological changes.
METHODS
In this study, to understand the molecular effects of persistent DO after BOO induction and deobstruction, we performed awake cystometry on female Sprague-Dawley rats divided into 4 groups: a sham group, a BOO group, a deobstructed group with DO after BOO (DDO), and a deobstructed group without DO after BOO (non-DDO). Total RNA was extracted from the bladder samples, and gene expression profiles were compared between the sham and model groups.
RESULTS
DO was observed in 5 of the 6 rats (83%) in the BOO group, and in 6 of the 13 rats (46%) in the deobstructed group. The non-DDO group showed a significantly greater residual volume than the DDO group. Through a clustering analysis of gene expression profiles, we identified 7,532 common upregulated and downregulated genes, the expression of which changed by more than 2 fold. In the BOO group, 898 upregulated and 2,911 downregulated genes were identified. The non-DDO group showed 3,472 upregulated and 4,025 downregulated genes, whereas in the DDO group, only 145 and 72 genes were upregulated and downregulated, respectively.
CONCLUSIONS
Abnormal function and gene expression profiles in bladders after BOO were normalized in the BOO rats with DO after deobstruction, whereas in those without DO, abnormal function persisted and the gene expression profile became more abnormal. DO may play a protective role against the stress to the bladder induced by BOO and deobstruction as a form of adaptive neuroplasticity.

Keyword

Urethral Obstruction; Urinary Bladder, Overactive; DNA; Microarray Analysis; Gene Expression Profiling

MeSH Terms

Animals
DNA
Female
Gene Expression Profiling
Gene Expression*
Humans
Microarray Analysis
Neuronal Plasticity
Rats*
Rats, Sprague-Dawley
Residual Volume
RNA
Transcriptome*
Urethral Obstruction
Urinary Bladder Diseases
Urinary Bladder Neck Obstruction*
Urinary Bladder*
Urinary Bladder, Overactive
DNA
RNA