Determining How Quickly Progesterone Slows LH Pulse Frequency

Studies under this protocol will be performed in normally cycling women and in women with
PCOS from 18 to 35 years old. Criteria for PCOS will be (a) clinical and/or biochemical
evidence of hyperandrogenism, (b) oligomenorrhea, and (b) the absence of clinical or
biochemical evidence of other potential causes of hyperandrogenism and/or oligomenorrhea.
After informed consent is obtained, all potential subjects will undergo a screening history
and physical exam. Subjects will need to fast for a minimum of 8 hours prior to screening
blood draw. After informed consent is obtained, blood tests (~ 16 cc) will be drawn at
0800-0900 h as follows: LH, FSH, progesterone (P), estradiol (E2), total testosterone, SHBG,
17-OHP, androstenedione, DHEA-S, beta-hCG, TSH, prolactin, CBC, chemistry and liver panels,
hemoglobin A1c, fasting insulin, and fasting glucose. Additionally, BOD POD® will be used to
measure total fat mass, fat free mass, and percent body fat. Waist and hip circumference will
be measured.

This study follows a crossover design, with assessment of the acute effects of P and placebo
(individually) on GnRH pulse frequency; subjects will be randomized to receive either P or
placebo during the first GCRC admission, with subsequent GCRC study occurring during a
subsequent cycle.

Women will begin E2 patches (0.1 mg/d per patch, 2 patches [delivering a total of 0.2 mg/d]
placed on the abdomen and changed every 2 d) on the evening of day 4-8 of the study cycle
(controls or PCOS) or >= 8 weeks post-menses (PCOS only). These patches will be continued for
a total of 4 d, with GCRC admission occurring on day 3 of E2 administration. Exogenous E2
administration will standardize hypothalamic exposure to E2 and help ensure the presence of
sufficient hypothalamic P receptors.

Four to 5 days before a scheduled GCRC admission, subjects will come to the GCRC for an
outpatient blood draw for P and beta-HCG (2 cc). If 30 days will have elapsed between (a) the
most recent hemoglobin and hematocrit and (b) the scheduled GCRC admission, a hemoglobin and
hematocrit will also be drawn at this time (1cc).

After 3 d of E2 administration, women will undergo a 24-h sampling study in the GCRC.
Estradiol administration (E2 patches) will continue throughout the GCRC admission. Subjects
will be admitted to the GCRC at 1800 h (2 h prior to sampling). Beginning at 2000 h, blood
will be obtained through an indwelling i.v. forearm heparin lock over a 24-h period as
follows: LH every 10 min (1 ml); P every 30 min (1 ml); FSH, E2, and T every 2 h (assays to
be run in same samples as LH and P). SHBG, fasting insulin, and fasting glucose (i.e.,
fasting since 2200 h) will be run on the 0600 h sample (extra 2 cc drawn). (Subjects will
fast from 2200 to 0600 h.) After 10 h of sampling (i.e., at 0600 h), either oral micronized P
(100 mg p.o.) suspension or placebo suspension will be administered (according to
randomization). With exogenous P, we aim to achieve mean plasma P concentrations 4-8 ng/ml.
Subjects will not be allowed to sleep during the day (i.e., from 0600 to 2200 h). Subjects
will be encouraged to sleep from 2200 to 0600. Sleep will be formally evaluated
(extraoculograms, electroencephalograms, wrist actigraphy, etc.). At the completion of
sampling, E2 patches will be discontinued. Volunteers will be discharged on oral iron (325 mg
BID). We will ask women to eat only the food provided by the GCRC.

Subjects will undergo another GCRC study identical to the first (including pretreatment with
E2, outpatient blood draw 4-5 days before admission, etc.), except that oral P will be
exchanged for placebo or vice versa in accordance with the crossover design. (Subjects will
again begin E2 patches on the evening of cycle day 4-8 [controls or PCOS] or >= 8 weeks
post-menses [PCOS only].) In this way, we will be able to standardize any change in GnRH
pulse frequency after P administration to any change in GnRH pulse frequency after placebo
administration.

The study will end after the second GCRC admission. Subjects will be asked to continue oral
iron supplementation for at least 30 d after this last GCRC admission.

Inclusion Criteria:

- Subjects will be healthy women in two groups: (1) women with regular menstrual cycles
and no evidence of hyperandrogenism, and (2) women with PCOS (defined as
clinical/biochemical evidence of hyperandrogenism plus oligomenorrhea, but with no
evidence for other endocrinopathies).

- Subjects will be 18-35 years old.

- Subjects will be willing to strictly avoid pregnancy (using non-hormonal methods)
during the time of study and must be willing and able to provide informed consent.

Exclusion Criteria:

- We will exclude women with a history of any disorders that may potentially be
complicated by hormonal treatment, such as DVT and breast, ovarian, or endometrial
cancer.

- We will exclude women with any other cancer diagnosis and/or treatment (with the
exception of basal cell or squamous skin carcinoma) unless they have remained
clinically disease free (based on appropriate surveillance) for five years.

- Women with anemia (hematocrit < 36% and/or a hemoglobin level <12 g/dl) will be
treated with iron for a maximum of 2 sequential months before the 1st admission and/or
before the 2nd admission. If they remain anemic after 2 sequential months of ferrous
gluconate (325 mg bid), they will then be excluded from further participation in the
study.

- Women with a history of any disorders that may potentially be complicated by long-term
iron supplementation, such as hemochromatosis and polycythemia vera, will be excluded.

- Women with a significant history of cardiac or pulmonary dysfunction (e.g., known or
suspected congestive heart failure; known or suspected coronary atherosclerosis;
asthma requiring systemic intermittent corticosteroids; etc.) will be excluded.

- Women with liver enzymes, alkaline phosphatase, or bilirubin > 1.5 times upper limit
of normal (confirmed on repeat) will be excluded, with the exception that mild
bilirubin elevations will be accepted in the setting of known Gilbert's syndrome.

- Abnormal sodium or potassium concentrations (confirmed on repeat); bicarbonate
concentrations <20 or >30 (confirmed on repeat)

- Women with abnormal renal function (i.e., serum creatinine > 1.4) will be excluded
(confirmed on repeat)

- Pregnant and breast-feeding women will be excluded.

- A history of allergy to progesterone or estradiol will constitute grounds for
exclusion.

- Women with a BMI greater or equal to 40 kg/m2.

- Virilization

- A total testosterone > 150 ng/dl in women with PCOS (which suggests the possibility of
a virilizing neoplasm) (confirmed on repeat)

- Elevated DHEAS (mild elevations may be seen in PCOS, and elevations < 1.5 times the
upper limit of normal will be accepted in PCOS) (confirmed on repeat)

- Follicular 17-hydroxyprogesterone > 300 ng/dl, which suggests the possibility of
congenital adrenal hyperplasia (if elevated during the luteal phase and there is a
concern about the possibility of congenital adrenal hyperplasia, the
17-hydroxyprogesterone may be collected during the follicular phase, or >60 if
oligomenorrheic). NOTE: If a 17-hydroxyprogesterone > 300 ng/dl is confirmed on repeat
testing, an ACTH stimulated 17-hydroxyprogesterone < 1000 ng/dl will be required for
study participation.

- A previous diagnosis of diabetes, a fasting glucose ≥ 126 mg/dl, or a hemoglobin A1c >
6.5%

- Abnormal TSH (subjects with adequately treated hypothyroidism, reflected by normal TSH
values, will not be excluded; or, for a new diagnosis of hypothyroidism, further study
will at the least be delayed pending appropriate treatment) (confirmed on repeat)

- Abnormal prolactin (mild elevations may be seen in PCOS, and elevations < 1.5 times
the upper limit of normal will be accepted in this group) (confirmed on repeat)

- Evidence of Cushing's syndrome by history or physical exam

- Due to the amount of blood being drawn in the study, subjects with body weight < 110
lbs. will be excluded from the study