Androgen Excess as a Cause for Adipogenic Dysfunction in PCOS Women

Aim 1. Examine mechanisms of subcutaneous abdominal adipose (fat) development in normal-weight PCOS women vs. BMI- and age-matched normal (control) women.

Subjects and clinical assessment: We will recruit 16 lean (18.5-25 kg/M2) PCOS subjects and 16 age- and BMI-matched controls. Subjects will complete a standardized questionnaire emphasizing menstrual dating, abnormal hair growth and acne. The questionnaire also will annotate age, smoking status, medications, surgical history and family histories of excess hair growth in female relatives and of diabetes in parents or siblings for exclusion criteria and for inclusion of some basic traits as covariates. Subjects also will undergo a physical examination; hirsutism will be scored by the modified Ferriman-Gallwey (mFG) method. Transvaginal sonography (TVUS) will be performed to determine the presence or absence of polycystic ovaries. A screening blood sample will be obtained for determinations of steroid hormones, SHBG, TSH, and prolactin.

Women of any ethnicity between the ages of 18 and 35 years will be recruited. PCOS patients will be diagnosed by 1990 NIH criteria. Controls will have regular menstrual cycles at 21 to 35 day intervals, a luteal phase progesterone (P4) level > 3 ng/mL, and no evidence of hirsutism, acne, alopecia, polycystic ovaries or endocrine dysfunction. Exclusion criteria are: present/past history (<1 year) of smoking, cancer, alcohol abuse, drug addiction, severe depression, or post traumatic stress; diabetes; uncontrolled hypertension (≥ 165/100); clinically significant hepatic or renal disease, or other major medical illness; signs or symptoms of infection; recent (within 30 days) use of an experimental device; recent (within 3 months) use of androgens, anabolic steroids or non-steroidal anti-inflammatory drugs; recent (within 3 months) use of hormonal agents (including birth control pills or insulin sensitizers); use of the drug warfarin.

Studies will be conducted in the follicular phase in controls and during amenorrhea in PCOS women. All subjects will undergo a modified frequently-sampled intravenous glucose tolerance test (FSIGTT). Glucose in the form of a 50% solution (0.3 g/kg) and regular human insulin (0.03 units/kg) will be injected through an intravenous line at 0 and 20 min, respectively. Blood will be collected at -20, -15, -5, 0, 2, 4, 8, 19, 22, 30, 40, 50, 70, 90, and 180 min for glucose and insulin determinations. Mathematical modeling of serial glucose and insulin determinations will calculate: insulin sensitivity index (SI, i.e. the action of insulin to accelerate glucose uptake and suppress glucose production), glucose effectiveness index (SG, i.e. the combined effect of glucose to enhance glucose uptake and suppress endogenous glucose production at basal insulin levels) and the acute response to glucose (AIRG).

Adipocytes isolation and culture: Approximately 1-2 gms of fat will be obtained from the lower SC abdomen using standard procedures under local anesthesia. Adipocytes (fat cells) and surrounding fat tissue will be isolated to measure adipocyte cell number and diameter, lipid accumulation and function, adiponectin, and stem cell development.

Procedures: All procedures will be performed in normal and PCOS women at the start of study.

i). Venipuncture: Fasting blood will be collected for blood count, chemistry panel, LH, FSH, total/free T, DHT, A4, DHEAS, E1, E2, anti-mullerian hormone (AMH), SHBG, adiponectin, leptin, IL-6, lipid profile and free fatty acids (FFAs).

ii ). Body composition: Body composition will be assessed by BMI, waist-to-hip circumference and DEXA scanning. Girths will be measured at the waist (narrowest section of the torso between ribs and umbilicus) and hips (largest protrusion of the hip region, above the gluteal fold). For total body fat and regional fat distribution, whole body scans will be performed, utilizing DEXA imaging.

iii). Body fat distribution: Total body DEXA will measure abdominal fat (i.e., the area between the dome of the diaphragm and the top of the hip. Total body DEXA images also will determine % body fat; fat-free body mass; total body, abdominal, and leg fat; and abdomen/leg fat mass ratio. The leg region is that area below the top of the hip bone (greater trochanter).

iv). Ovarian testing: Transvaginal ultrasound will be performed in the follicular phase in controls and during amenorrhea in PCOS women. Ovarian volume will be calculated. Antral follicle number, defined as the total follicle number (2-9 mm in diameter) of both ovaries, will be determined by 1 investigator (D.A.D.). Polycystic ovaries will be identified, with one such ovary sufficient to define PCO

Aim 2. Determine the role of androgen in SC abdominal ASC dysfunction and its relation to metabolism in normal-weight PCOS women through androgen. antagonism by clinical use of flutamide vs. placebo.

Modified FSIGTT and Adipogenic studies: The modified FSIGTT and all adipogenic studies performed at study initiation will be repeated at the end of the 6-month flutamide vs. placebo intervention in PCOS women.

Procedures: All procedures performed at study initiation also will be repeated at the end of the six 28-day cycles of flutamide vs. placebo intervention in PCOS women. In addition, monthly liver function studies will be performed to detect possible elevations of serum transaminase levels above the normal range during flutamide vs. placebo therapy.

Menstrual records: Ovulatory frequency will be determined by having subjects keep a daily menstrual record and collect weekly first morning urine samples for possible progesterone and creatinine determinations. Urine samples will be frozen for later analysis to determine evidence of ovulation, as necessary.

Aim 3. Identify epigenetic changes that underlie SC abdominal ASC dysfunction in normal-weight PCOS women vs. BMI- and age-matched controls.

Subcutaneous abdominal adipose stem cells from PCOS and control women will be grown into newly-formed fat cells (adipocytes) in the laboratory. Cells will be studied before and after 6-month treatment with placebo vs flutamide for changes in the cell epigenome (methylation, RNA sequences and histone modification).