Neonatal Bladder Irritation Is Associated With Vanilloid Receptor TRPV1 Expression in Adult Rats.
- Author:
Jee Soo PARK
1
;
Hae Do JUNG
;
Young Sam CHO
;
Mei Hua JIN
;
Chang Hee HONG
Author Information
- Publication Type:Original Article
- Keywords: Urinary bladder; Urinary tract infections; Interstitial cystitis; Capsaicin; TRPV cation channels
- MeSH: Acetic Acid; Adult*; Animals; Capsaicin; Cystitis, Interstitial; Diagnosis-Related Groups; Female; Ganglia, Spinal; Humans; Inflammation; Neurons; Rats*; Rats, Sprague-Dawley; RNA, Messenger; TRPV Cation Channels; Urinary Bladder*; Urinary Tract; Urinary Tract Infections
- From:International Neurourology Journal 2018;22(3):169-176
- CountryRepublic of Korea
- Language:English
- Abstract: PURPOSE: To evaluate whether mild chemical irritation of the bladder in neonatal rats is associated with persistent vanilloid receptor transient receptor potential vanilloid subfamily 1 (TRPV1) activity in adult rats. METHODS: Female Sprague-Dawley rats were used. Ten-day-old rat pups underwent bladder sensitization via intravesical infusion of 0.2% acetic acid in saline with or without prior bladder desensitization with capsaicin. After 8 weeks, 3 groups of rats (control [group 1], bladder sensitization [group 2], and bladder desensitization [group 3]) underwent cystometry. Inflammation of bladder tissue and the expression of TRPV1 in bladder tissue and dorsal root ganglia (DRG) were also evaluated. RESULTS: The bladder sensitization group showed more frequent voiding contractions. TRPV1 expression in adult bladder tissue was elevated in group 2. TRPV1 mRNA levels in the bladder and DRG were significantly higher in group 2 than in group 1. Moreover, group 2 had significantly more DRG neurons (identified by uptake of the retrograde label Fast Blue) that exhibited TRPV1 immunoreactivity. CONCLUSIONS: We found a significant association between neonatal bladder sensitization and persistent TRPV1 activity in adult rats. This is the first study to focus on the underlying pathogenesis of bladder overactivity from childhood to adulthood. Our findings could lead to the development of new strategies for the treatment and prevention of adult urinary symptoms arising from childhood urinary tract dysfunction.
