Effects of Estradiol on Histological Parameters and Secretory Ability of Pituitary Mammotrophs in Ovariectomized Female Rats.
CELL JOURNAL 2017;
19:461-468. [PMID:
28836408 PMCID:
PMC5570411 DOI:
10.22074/cellj.2017.4334]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 08/16/2016] [Indexed: 01/02/2023]
Abstract
Objective
Estrogen replacement therapy remains current as a therapeutic approach to
treat menopausal symptoms and may significantly affect hormone-producing cells in the
female pituitaries. The aim of this study was to examine the histological parameters of
pituitary mammotrophs and prolactin secretion after chronic estradiol treatment in ovariectomized adult female rats, reflecting premature menopause.
Materials and Methods
In this experimental study, adult female Wistar rats were divided into non-ovariectomized (C),
ovariectomized (OVX) and estradiol-treated ovariectomized (OVX+E) groups. Estradiol dipropionate [0.625 mg/kg body mass per
day] was administered for four weeks, while the C and OVX groups received vehicle
alone. Mammotrophs were identified by the peroxidase-antiperoxidase (PAP) immunohistochemical procedure, while prolactin concentrations were measured by the
non-isotopic two-step assay (Delfia) method. Comparison of the differences between
groups was performed using one-way analysis of variance (ANOVA) and Tukay (honest significant difference) HSD test.
Results
Ovariectomy caused significant (P<0.05) decreases in mammotroph optical
density (OD), volume density (VV) and number per mm2 by 29, 27 and 34%, respectively, in comparison with the C females. In the OVX+E group, significant (P<0.05)
increases in OD, cell volume, VVand number of mammotrophs per mm2 by 181, 15%,
5.8-fold and 5.2-fold, respectively, were observed when compared to OVX animals.
The serum prolactin concentration in OVX females was significantly (P<0.05) decreased by 14% in comparison to the C group, while in OVX+E females, prolactin
levels were significantly (P<0.05) increased by 53% compared to the OVX controls.
Conclusion
Estradiol supplementation in ovariectomized females is followed by
stimulatory histological and secretory changes of the mammotrophs. These results
could serve as indicators of possible prolactinome development upon estradiol application in premature menopausal subjects.
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