Hyperandrogenism alters intraovarian parameters during early folliculogenesis in mice.

Abstract:

:This study aimed to investigate how hyperandrogenism affects early folliculogenesis. Hyperandrogenism was induced in prepuberal female BALB/c mice by daily s.c. injection of dehydroepiandrosterone (60 mg/kg body weight in 0.1 ml sesame oil) for 10 consecutive days. Although hyperandrogenism increased the growth rate of primary follicles, it also increased ovarian oxidative stress (evaluated by the increase in lipid peroxidation, the decrease in superoxide dismutase activity and the fact that glutathione content was not modified). By using the annexin V/cytometry assay it was found that the excess of androgens decreased viable ovarian cells and increased early apoptotic ones. The increased lipid peroxidation induced enhanced ovarian prostaglandin E production. In addition, hyperandrogenism increased the number of T lymphocytes that infiltrate ovarian tissue and modified their phenotype (decreased CD4+ or helper and increased the suppressor/cytotoxic CD8+). The excess of androgens decreased the ovarian expression of the long isoform of leptin receptor (Ob-Rb, the only isoform expressed in the ovarian tissue) when compared with controls. All these alterations increased serum concentrations of oestradiol, a pro-apoptotic agent. It is concluded that the excess of androgens impairs early follicular development by modulating some endocrine and immune parameters that are either directly or indirectly related to follicular atresia.

journal_name

Reprod Biomed Online

authors

Belgorosky D,Sander VA,Yorio MP,Faletti AG,Motta AB

doi

10.1016/j.rbmo.2010.02.012

subject

Has Abstract

pub_date

2010-06-01 00:00:00

pages

797-807

issue

6

eissn

1472-6483

issn

1472-6491

pii

S1472-6483(10)00068-4

journal_volume

20

pub_type

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