Abstract：
OBJECTIVE:The purpose of this study was to evaluate the effects of two sex hormones on normal mammary gland of female rats. METHODS:Forty 250-day-old female rats, 20 of them with offspring and 20 not, were ovariectomized and, divided into 4 subgroups in order to receive one of the following subcutaneous treatment: estradiol benzoate (EB), medroxyprogesterone (MPA), EB+MPA or placebo, for 10 weeks. After treatment, mammary glands were studied with optical microscope. Whole gland, lobule, ductule and lumen compartments were evaluated by morphometric methods. Also a qualitative evaluation were performed seeking for secretion, microcalcification and trophic status. RESULTS:It was found that (a) MPA-only and placebo were similar for all parameters; (b) the same between EB and EB+MPA; (c) EB and EB+MPA increased lobule, ductule and lumen compartments significantly compared to MPA-only or placebo; (d) EB increased epithelium but without significance and EB+MPA increased it significantly compared to placebo or MPA; (e) EB and EB+MPA incremented secretion. CONCLUSIONS:In normal mammary gland of female rats: progestin action depends on estrogen presence. MPA does not revert estrogen-dependent proliferation, but it magnifies estradiol effect. Both EB and EB+MPA stimulate differentiation. Rats without offspring presented a greater epithelial proliferation under treatment with these sex hormones.
journal_name
Maturitasjournal_title
Maturitasauthors
Pompei LM,Carvalho FM,Ortiz SC,Motta MC,Cruz RJ,Melo NRdoi
10.1016/j.maturitas.2004.09.007keywords:
subject
Has Abstractpub_date
2005-08-16 00:00:00pages
370-9issue
4eissn
0378-5122issn
1873-4111pii
S0378-5122(04)00320-2journal_volume
51pub_type
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