Assessment of Day-night Secretion of Progesterone and LH Across Puberty

University of Virginia75 enrolled

Overview

Hormones are substances that are made by the body and are sent directly out into the bloodstream to increase or decrease the function of certain organs, glands, or other hormones. Testosterone is a hormone found in the blood of all girls, but some girls have too much testosterone in their blood. Too much testosterone in the blood can possibly lead to a problem called polycystic ovary syndrome (PCOS). People with PCOS have abnormal menstrual periods, excess facial and body hair, and too much testosterone in their blood. On the other hand, some girls with too much testosterone in their blood do not develop PCOS. We do not know why some of these girls develop PCOS and why some do not. The purpose of this research study is to find out whether too much testosterone can cause problems with other hormones that can lead to the development of PCOS. This study may help us understand more about the causes of PCOS.

Polycystic ovary syndrome (PCOS) is a common disorder marked by irregular ovulation and hyperandrogenism. Hyperandrogenemia during adolescence can be a forerunner of adult PCOS. However, the progression of hormonal abnormalities leading to PCOS are unclear. We will examine hormonal profiles (e.g., LH, FSH, progesterone, testosterone, estradiol) during pubertal maturation in adolescent girls with and without elevated plasma androgens. The working hypothesis is that, in pubertal girls without hyperandrogenemia, overnight rises of progesterone are associated with a reduction of LH frequency during the waking morning hours. However, in pubertal girls with hyperandrogenemia, LH frequency will be higher than normal during both the day and night, despite similar or higher progesterone levels. The studies will involve frequent blood sampling over 18 hours. We will assess differences in hormone parameters between time blocks (1900-2300 h, 2300-0300 h, 0300-0700 h, 0700-1100 h) in individuals to evaluate day-night changes. We will compare such changes between those with hyperandrogenemia and those without hyperandrogenemia.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Puberty

Eligibility

Sex: FEMALEMin age: 7 YearsMax age: 17 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Early and late pubertal girls with normal androgens * Early and late pubertal girls with hyperandrogenemia * All subjects will be girls from pre-puberty (Stage 1 breast development and pubic hair growth but at least 7 years old) to 7 years post menarche. Exclusion Criteria: * Pregnancy * Inability to comprehend what will be done during the study or why it will be done * Hemoglobin \<11.5 g/dL for non-African American subjects; Hemoglobin \< 11.0 g/dL for African American subjects * Persistently abnormal sodium, potassium, or bicarbonate (i.e., confirmed on repeat) * Persistently elevated creatinine, hepatic transaminases, or alkaline phosphatase (i.e., confirmed on repeat) * Total bilirubin \> 1.5 times upper limit of normal (i.e., confirmed on repeat) * Significant history of cardiac or pulmonary dysfunction (e.g., known or suspected congestive heart failure; asthma requiring intermittent systemic corticosteroids; etc.) * Untreated hypo- or hyperthyroidism (reflected by persistently abnormal TSH values) * Total testosterone \> 200 ng/dl * Basal (follicular) 17-OHP \> 200 ng/ml (in girls without a previous diagnosis of congenital adrenal hyperplasia) * DHEA-S \> 800 mcg/dl * Elevation of prolactin \> 2 times upper limit of normal * Weight less than 25 kg

Outcomes

Primary Outcomes

Difference in mean LH frequency when awake (19:00-23:00 and 07:00-11:00) and when asleep (23:00-07:00) in girls with and without hyperandrogenemia

Time frame: Time frame for the study will be 18 hours (Sampling begins at 1800 hrs and proceeds through 1200 hours the following day).

Secondary Outcomes

Daytime (awake) and nighttime (sleep) differences in hormones (LH, FSH, T, E2, P, and cortisol) in girls with and without hyperandrogenemia