Endocrine

, Volume 50, Issue 3, pp 764–776 | Cite as

Effects of soy phytoestrogens on pituitary-ovarian function in middle-aged female rats

  • Ivana M. Medigović
  • Jasmina B. Živanović
  • Vladimir Z. Ajdžanović
  • Aleksandra L. Nikolić-Kokić
  • Sanja D. Stanković
  • Svetlana L. Trifunović
  • Verica Lj. Milošević
  • Nataša M. Nestorović
Original Article

Abstract

The aim of this study was to assess the effects of genistein (G) and daidzein (D) on the histological, hormonal, and functional parameters of the pituitary-ovarian axis in middle-aged female rats, and to compare these effects with the effects of estradiol (E), commonly used in the prevention and treatment of menopausal symptoms. Middle-aged (12 month old) Wistar female rats subcutaneously received 35 mg/kg of G, or 35 mg/kg of D, or 0.625 mg/kg of E every day for 4 weeks. Each of the treated groups had a corresponding control group. An intact control group was also established. G and D did not change the intracellular protein content within gonadotropic and lactotropic cells, but vacuolization was observed in all the cell types. In contrast, E caused an inhibition of gonadotropic and stimulation of lactotropic cells. Also, ovaries of middle-aged female rats exposed to G or D have more healthy primordial and primary follicles and less atretic follicles. E treatment in the ovaries had a mostly negative effect, which is reflected by the increased number of atretic follicles in all tested classes. G and D provoked decrease in CuZnSOD and CAT activity, while E treatment increased MnSOD and decreased CuZnSOD and GSHPx activity. All the treatments increased serum estradiol and decreased testosterone levels, while D and E increased the serum progesterone level. In conclusion, soy phytoestrogens exhibited beneficial effects on pituitary-ovarian function in middle-aged female rats, as compared to estradiol.

Keywords

Genistein Daidzein Estradiol Pituitary-ovarian function 

Notes

Acknowledgments

This work was supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia, Grant Number 173009. The authors wish to express their sincere gratitude to Olympus d.o.o. Belgrade, Serbia, for technical support.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Ivana M. Medigović
    • 1
  • Jasmina B. Živanović
    • 1
  • Vladimir Z. Ajdžanović
    • 1
  • Aleksandra L. Nikolić-Kokić
    • 2
  • Sanja D. Stanković
    • 3
  • Svetlana L. Trifunović
    • 1
  • Verica Lj. Milošević
    • 1
  • Nataša M. Nestorović
    • 1
  1. 1.Department of Citology, Institute for Biological Research “Siniša Stanković”University of BelgradeBelgradeSerbia
  2. 2.Department of Physiology, Institute for Biological Research “Siniša Stanković”University of BelgradeBelgradeSerbia
  3. 3.Center for Medical Biochemistry, Clinical Centre of Serbia, School of PharmacyUniversity of BelgradeBelgradeSerbia

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