Document Detail


Functional roles of TRPV1 channels in lower urinary tract irritated by acetic acid: in vivo evaluations of the sex difference in decerebrate unanesthetized mice.
MedLine Citation:
PMID:  20237234     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Sex-specific differences in activity of the lower urinary tract (LUT) responding to acid irritation in mice have been revealed. This study, using continuous infusion cystometry with acetic acid (AA; pH 3.0), was conducted to examine whether the transient receptor potential vanilloid type 1 (TRPV1) channels expressed in the mouse LUT are involved in the sex difference in functional responses of the bladder and urethra to irritation. No differences were found between effects of capsazepine (a TRPV1 blocker; 100 microM) and those of its vehicle on any of the cystometric changes by intravesical AA in either female or male mice. However, capsazepine eliminated the acid-induced sex differences in parameters associated with bladder contraction phase (i.e., maximal voiding pressure, closing peak pressure, 2nd-phase contraction, bladder contraction duration), whereas capsazepine did not affect those in parameters associated with bladder-filling period (i.e., intercontraction interval, actual collecting time). In males, capsazepine reduced the number of bladder contractions accompanying fluid dribbling at 2nd-phase contraction, which is indicative of the urethral response to irritation, whereas in females it increased the number. Together, these results suggest the possibilities that TRPV1 channels in the bladder and urethra are involved in the sex difference in the LUT response to acid irritation and that these participate, e.g., via "cross talk" between the bladder and urethra, in the fine-tuning of intravesical pressure (or bladder emptying) at the bladder contraction phase under irritated LUT conditions but not in sensing for bladder filling during the storage period, although the contribution of the mechanism may be small.
Authors:
Mitsuharu Yoshiyama; Isao Araki; Hideki Kobayashi; Hidenori Zakoji; Masayuki Takeda
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-17
Journal Detail:
Title:  American journal of physiology. Renal physiology     Volume:  298     ISSN:  1522-1466     ISO Abbreviation:  Am. J. Physiol. Renal Physiol.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-21     Completed Date:  2010-06-14     Revised Date:  2011-04-28    
Medline Journal Info:
Nlm Unique ID:  100901990     Medline TA:  Am J Physiol Renal Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  F1351-9     Citation Subset:  IM    
Affiliation:
Department of Urology, University of Yamanashi Interdisciplinary Graduate School of Medicine and Engineering, Chuo, Yamanashi, Japan. pxn15164@nifty.ne.jp
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MeSH Terms
Descriptor/Qualifier:
Acetic Acid / administration & dosage*
Administration, Intravesical
Animals
Capsaicin / administration & dosage,  analogs & derivatives
Decerebrate State*
Female
Irritants / administration & dosage*
Male
Mice
Mice, Inbred C57BL
Muscle Contraction / drug effects
Neurons, Afferent / drug effects*,  metabolism
Neurons, Efferent / drug effects*,  metabolism
Pressure
Reflex / drug effects
TRPV Cation Channels / drug effects*,  metabolism
Time Factors
Urethra / innervation*
Urinary Bladder / innervation*
Urination / drug effects
Chemical
Reg. No./Substance:
0/Irritants; 0/TRPV Cation Channels; 0/TRPV1 protein, mouse; 0/capsazepine; 404-86-4/Capsaicin; 64-19-7/Acetic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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