title: Dietary phytoestrogens maintain contractile responses to carbachol with age in the female rat isolated bladder.
abstract: OBJECTIVE
  Development of urinary incontinence, for many women, occurs following menopause. Dietary phytoestrogens consumed over the long term may affect the contractile function and maintenance of the urinary bladder in post menopausal women. This study examined the muscarinic receptor mediated contractile responses in the rat isolated bladder in response to ovariectomy and long term dietary phytoestrogen consumption.
  
  
  METHODS
  Ovariectomised or sham-operated female Wistar rats (8 weeks) were fed either normal rat chow (soy, phytoestrogens) or a non-soy (phytoestrogen free) diet. Bladders were dissected from rats at 12, 24 and 52 weeks of age and placed in 25 ml organ baths filled with McEwans solution.
  
  
  RESULTS
  The contractile response to carbachol, in 12 week old female rats did not change as a result of dietary phytoestrogens or ovariectomy (P>0.05). At 24 weeks of age, detrusor muscle strip responses to carbachol from non-soy fed ovariectomised rats were attenuated (P<0.05). At 52 weeks, bladder detrusor strip responses to carbachol were reduced in all treatment groups with the exception of the soy-fed sham operated rats.
  
  
  CONCLUSIONS
  These results suggest an age-related reduction in the contractile response of the detrusor to the muscarinic receptor agonist carbachol, which may be prevented by long term dietary phytoestrogen intake.
authors: School of Medical Sciences, Griffith University, Gold Coast Campus, Queensland, 4222, Australia.
authors: Suzzanne J
authors: SJ
authors: Owen
authors: Roselyn B
authors: RB
authors: Rose'Meyer
authors: Helen M
authors: HM
authors: Massa
mesh_terms: D000367:Age Factors; D000821:Animal Feed; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D002217:Carbachol / Q000494:pharmacology*; D018679:Cholinergic Agonists / Q000494:pharmacology*; D005260:Female; D066298:In Vitro Techniques; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D009929:Organ Size / Q000187:drug effects; D010052:Ovariectomy; D048789:Phytoestrogens / Q000008:administration & dosage*; D051381:Rats; D017208:Rats, Wistar; D011976:Receptors, Muscarinic; D030262:Soybean Proteins / Q000008:administration & dosage*; D013025:Glycine max; D001743:Urinary Bladder / Q000187:drug effects* / Q000473:pathology / Q000503:physiopathology; D053201:Urinary Bladder, Overactive / Q000178:diet therapy / Q000517:prevention & control
chemical_list: D018679:Cholinergic Agonists; D048789:Phytoestrogens; D011976:Receptors, Muscarinic; D030262:Soybean Proteins; D002217:Carbachol