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The effect of long‐term hormonal treatment on voiding patterns during filling cystometry and on urethral histology in a postpartum, ovariectomized female rat
Author(s) -
Breyer Benjamin N.,
Wang Guifang,
Lin Guiting,
Shindel Alan W.,
Yang Rong,
Lin ChingShwun,
Lue Tom F.
Publication year - 2010
Publication title -
bju international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.773
H-Index - 148
eISSN - 1464-410X
pISSN - 1464-4096
DOI - 10.1111/j.1464-410x.2010.09268.x
Subject(s) - cystometry , ovariectomized rat , medicine , raloxifene , elastin , urology , urethra , endocrinology , urethral sphincter , overactive bladder , estrogen , sham surgery , urinary bladder , estrogen receptor , pathology , alternative medicine , cancer , breast cancer
OBJECTIVE To study whether long‐term treatment with oestrogen (E 2 ), selective E 2 receptor modulators (SERMs), or growth hormone (GH) can prevent the development of abnormal voiding patterns during filling cystometry (CMG) in a postpartum, ovariectomized (Ovx) female rat. MATERIALS AND METHODS Immediately after spontaneous delivery, 60 primiparous Sprague‐Dawley rats were randomly divided into six equal groups. One group served as uninjured sham controls and five groups underwent intravaginal balloon dilatation. On day seven, previously dilated rats underwent bilateral Ovx and implantation of a subcutaneous hormone‐delivery pump. The five treatment groups received normal saline (control), E 2 , raloxifene, levormeloxifene, or GH for 7 weeks. Conscious CMG was performed 7 weeks after Ovx. Urethral sphincter tissue was harvested for elastin immunohistochemistry and real‐time polymerase chain reaction of α 1A ‐adrenoceptor mRNA. RESULTS No abnormal voiding patterns were detected in the group treated with GH. The E 2 , raloxifene and levormeloxifene groups had greater detrusor overactivity and urethral relaxation incontinence than control rats. The raloxifene group had a significantly lower baseline bladder pressure and opening pressure. GH‐treated rats had higher elastin content in the urethra. Urethral α 1A ‐adrenoceptor mRNA concentration was significantly lower in the SERM‐treated rats compared with controls. CONCLUSIONS GH prevents the development of abnormal voiding patterns during filling CMG in a rat model of parturition‐induced incontinence; E 2 and SERMs may worsen voiding patterns.