Abstract：
OBJECTIVES:To investigate the antimuscarinic effect of oxybutynin in the rat detrusor muscle after estrogen pretreatment because, to our knowledge, no study has been done on the interaction of estrogen with antimuscarinic drugs. Estrogen has been shown to affect muscarinic receptors in the detrusor muscle of animals. In addition, oxybutynin has been shown to block muscarinic receptors in the bladder. METHODS:Estradiol benzoate (150 microg/kg) or saline was given subcutaneously to virgin female Wistar albino rats (n = 6, each group) for 10 consecutive days. On the 11th day, isolated detrusor muscle strips were taken, and acetylcholine (ACh)-induced contractions were evaluated in the absence or presence of oxybutynin (10 and 100 nM). RESULTS:ACh induced concentration-dependent contractions in the detrusor muscle. In the estradiol-pretreated group, the maximum of the ACh-induced contractions was diminished compared with that in the control group (P < 0.05). Oxybutynin (10 and 100 nM) inhibited ACh-induced contractions competitively (pK(B) 8.85). In the estradiol-pretreated group, the concentration-response curve to ACh was shifted further to the right in the presence of oxybutynin (100 nM). CONCLUSIONS:We have demonstrated for the first time that oxybutynin further inhibits ACh-induced and muscarinic receptor-mediated contractions in rat detrusor muscle after pretreatment with estrogen.
journal_name
Urologyjournal_title
Urologyauthors
Yildiz O,Ozgok Y,Seyrek M,Un I,Kilciler M,Tuncer Mdoi
10.1016/j.urology.2004.10.069subject
Has Abstractpub_date
2005-04-01 00:00:00pages
800-3issue
4eissn
0090-4295issn
1527-9995pii
S0090-4295(04)01326-3journal_volume
65pub_type
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