Profile of Daughters and Sisters of Women With Polycystic Ovary Syndrome: The Role of Proband's Glucose Tolerance.

Context: First-degree relatives of women with polycystic ovary syndrome (PCOS) present hormonal and metabolic alterations compared to girls unrelated to PCOS. It is unknown whether glucose intolerance in the PCOS proband confers a more severe metabolic predisposition on their first-degree relatives.

Objective: To determine whether glucose tolerance status in women with PCOS is associated with worsened glucose metabolism and sex hormone levels in their peripubertal daughters or sisters.

Adipocytes from women with polycystic ovary syndrome demonstrate altered phosphorylation and activity of glycogen synthase kinase 3.

Objective: To test the hypothesis that an abnormality in glycogen synthase kinase-3 (GSK3) is a pathogenic factor in polycystic ovary syndrome (PCOS).

Design: Prospective experimental study (adipocytes).

Setting: Tertiary-care academic medical center and teaching hospital.

Ovarian enzyme activities in women with polycystic ovary syndrome.

Studies using primary ovarian tissue and cultured human theca and granulosa cells have shown that steroidogenic enzyme activities are up-regulated in theca cells in polycystic ovary syndrome (PCOS). Although granulosa cells in arrested follicles in PCOS fail to express significant amounts of aromatase, there is an overexpression of 5alpha-reductase activity and premature expression of cholesterol side-chain cleavage cytochrome P450.

Mutagenesis of putative serine-threonine phosphorylation sites proximal to Arg255 of human cytochrome P450c17 does not selectively promote its 17,20-lyase activity.

Objective: To investigate the role of serine-threonine phosphorylation on the activity of human P450c17.

Design: In vitro study.

Setting: Academic basic research laboratory.

Dietary galactose inhibits GDF-9 mediated follicular development in the rat ovary.

Clinical evidence suggests an association between galactosemia and premature ovarian failure, but the mechanism is still not fully understood. Growth differentiation factor-9 (GDF-9) is thought to be an obligatory growth factor during the gonadotropin-independent phase of folliculogenesis. The objective of this study was to examine the effects of galactose on initiation of folliculogenesis in the peripubertal interval and the connection between galactose toxicity and GDF-9 expression in the ovary.

Resistin stimulation of 17alpha-hydroxylase activity in ovarian theca cells in vitro: relevance to polycystic ovary syndrome.

Context: A newly discovered hormone resistin has been shown to be increased in women with polycystic ovary syndrome (PCOS).

Objective: The purpose of this study was to confirm increased resistin concentrations in women with PCOS and to test the direct effect of resistin on human theca cell androgen production.

Design: Resistin was measured in fasting serum samples by RIA.

Ovarian theca cell.

Theca cells are the endocrine cells associated with ovarian follicles that play an essential role in fertility by producing the androgen substrate required for ovarian estrogen biosynthesis. Theca cells differentiate from the interfollicular stroma in response to proteins secreted from growing follicles. The most common endocrine cause of infertility is associated with excessive proliferation of theca cells and ovarian hyperandrogenism.

Estrogen receptor alpha and beta expression in uterine leiomyomas from premenopausal women.

Objective: To measure messenger RNA levels of estrogen receptor (ER) alpha and beta in uterine leiomyomas, normal myometrium, and endometrium.

Design: Prospective study.

Setting: University hospital.

Metabolic effects of dietary lactose in adult female rats.

As an outgrowth of our interest in the potential toxicity of dietary galactose, we investigated the metabolic effects of high lactose diets in Long-Evans female rats. Seventy-five Long-Evans female rats (25-day-old) were randomized to receive one of 3 diets for 7 months: glucose diet (CON); low lactose diet (10.5%, LLD); or a high lactose diet (41.

Differential effects of estradiol, raloxifene and tamoxifen on estrogen receptor expression in cultured human skin fibroblasts.

The balance between ER-alpha and ER-beta in fibroblasts may be crucial in the physiological response to ligands. Up- or down-regulation of the ERs in response to different compounds could mediate the reversal of certain age-related changes in skin and connective tissue. The time-dependent effects of 17-beta estradiol, raloxifene and tamoxifen on ER-alpha and ER-beta mRNA expression in the skin fibroblast cultures were performed.

Insulin augmentation of 17alpha-hydroxylase activity is mediated by phosphatidyl inositol 3-kinase but not extracellular signal-regulated kinase-1/2 in human ovarian theca cells.

Polycystic ovary syndrome, characterized by hyperandrogenism and chronic anovulation, is frequently associated with insulin resistance. Ample evidence implicates a role for insulin in the genesis of ovarian hyperandrogenism. The objective of this study was to begin to define the intracellular signaling pathway(s) that mediates insulin regulation of 17alpha-hydroxylase activity in human ovarian theca cells.

Estrogen receptor alpha and beta expression in theca and granulosa cells from women with polycystic ovary syndrome.

A defining characteristic of dominant follicles is high estradiol concentrations. Abnormal expression of estrogen receptors (ERs) could contribute to poor follicular development and ovulatory failure in polycystic ovary syndrome (PCOS). The aim of this study was to determine whether there are differences in ERalpha and ERbeta expression in granulosa cells (GC) and theca cells (TC) from women with PCOS, compared with regularly cycling women.

Human cultured skin fibroblasts express estrogen receptor alpha and beta.

Human skin fibroblasts may be the target cells for estrogens. The aim of present study was to confirm the presence of both isoforms of estrogen receptors (ER) in these cells. Experiments were carried out in primary cultures of human skin fibroblasts.

Overexpression of theca-cell messenger RNA in polycystic ovary syndrome does not correlate with polymorphisms in the cholesterol side-chain cleavage and 17alpha-hydroxylase/C(17-20) lyase promoters.

Objective: To determine whether overexpression of CYP17 or CYP11A messenger (m)RNA in theca cells from polycystic ovaries is related to polymorphic regions in the gene promoters that may increase transcription.

Design: Case-control study.

Setting: Research institute.