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Alteration of muscarinic and purinergic receptors in urinary bladder of rats with cyclophosphamide-induced interstitial cystitis.

Abstract：

:We characterized muscarnic and purinergic receptors and urodynamic parameters in the bladder of cyclophosphamide (CYP)-treated rats to clarify the mechanisms involved in the pathophysiology of interstitial cystitis (IC). In the cystometry of CYP-treated rats compared with control rats, the micturition interval and micturition volume were significantly (55% and 77%, respectively) decreased and the frequency of micturition and basal pressure were significantly (3 and 2.3 times, respectively) increased. These changes in urodynamic parameters may characterize the detrusor overactivity occurring in CYP-treated rats. The maximal number of binding sites (B(max)) for specific binding of [N-methyl-(3)H]scopolamine methyl chloride ([(3)H]NMS) and alphabeta-methylene ATP [2,8-(3)H]tetrasodium salt ([(3)H]alphabeta-MeATP) was significantly (43% and 31%, respectively) decreased in the bladder of CYP-treated rats compared with control rats. On the other hand, the apparent dissociation constant (K(d)) for neither radioligand was significantly altered by the CYP treatment. K(i) value for the inhibition of bladder [(3)H]NMS binding by antimuscarinic agents (oxybutynin, tolterodine, darifenacin, and AF-DX 116) did not differ significantly between control and CYP-treated rats. The inhibition constant (K(i)) for the inhibition of bladder [(3)H]alphabeta-MeATP binding by purinergic antagonists (A-317491, PPADS) was significantly higher in CYP-treated rats than control rats. In conclusion, CYP treatment has been shown to cause down-regulation of pharmacologically relevant (muscarinic and purinergic) receptors in the bladder of rats. Thus, the present study offers further pharmacological evidence that both muscarinic and purinergic mechanisms contribute significantly to the urinary dysfunction due to IC.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Kageyama A,Fujino T,Taki Y,Kato Y,Nozawa Y,Ito Y,Yamada S

doi

10.1016/j.neulet.2008.02.065

subject

Has Abstract

pub_date

2008-05-02 00:00:00

pages

81-4

issue

1

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(08)00274-7

journal_volume

436

pub_type

杂志文章

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