No conflict of interest reported by the author(s).
Original Basic Science Article
The molecular basis of urgency: regional difference of vanilloid receptor expression in the human urinary bladder†
Article first published online: 2 OCT 2006
Copyright © 2006 Wiley-Liss, Inc.
Neurourology and Urodynamics
Volume 26, Issue 3, pages 433–438, May 2007
How to Cite
Liu, L., Mansfield, K. J., Kristiana, I., Vaux, K. J., Millard, R. J. and Burcher, E. (2007), The molecular basis of urgency: regional difference of vanilloid receptor expression in the human urinary bladder. Neurourol. Urodyn., 26: 433–438. doi: 10.1002/nau.20326
- Issue published online: 25 APR 2007
- Article first published online: 2 OCT 2006
- Manuscript Accepted: 5 JUL 2006
- Manuscript Received: 4 APR 2006
- Australasian Urological FoundationFaculty of Medicine, University of New South Wales
- idiopathic detrusor overactivity;
- sensory urgency;
- vanilloid receptor (TRPV1)
Treatments targeting vanilloid receptor TRPV1 are effective in some bladder disorders. Our aim was to determine the expression profiles of TRPV1 in regions of human bladder and test the hypothesis that there would be an upregulation of TRPV1 in mucosa of patients with bladder hypersensitivity but not idiopathic detrusor overactivity (IDO).
Materials and Methods
Women with sensory urgency (SU), interstitial cystitis (IC), and IDO were investigated by videourodynamics and cystoscopy. Control biopsies were used for comparison. Biopsies were dissected into mucosa and muscle, and evaluated for TRPV1 mRNA expression using quantitative competitive RT-PCR (QC-RT-PCR).
TRPV1 mRNA from SU trigonal mucosa was significantly higher than control trigonal mucosa or SU bladder body mucosa. In contrast, in IDO patients, there was no difference between trigonal mucosa and body mucosa. In IC biopsies, RNA quality was substandard and unable to be used for analysis. The most striking finding was that TRPV1 mRNA expressed in SU trigonal mucosa was significantly inversely correlated with the bladder volume at first sensation of filling during cystometry. No such relationship was seen for IDO trigonal mucosa. No difference was seen in bladder body mucosa from any disease groups compared with age-matched control.
The symptoms of SU were associated with the increased expression of TRPV1 mRNA in the trigonal mucosa. No upregulation or regional differences of TRPV1 mRNA were seen in IDO patients. TRPV1 may play a role in SU and premature first bladder sensation on filling. Neurourol. Urodynam. 26:433–438, 2007. © 2006 Wiley-Liss, Inc.