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Endogenous Circadian Regulation of Female Reproductive Hormones

Rahman, S.A., Grant, L.K., Gooley, J.J., Rajaratnam, S.M.W., Czeisler, C.A. and Lockley, Steven (2019) Endogenous Circadian Regulation of Female Reproductive Hormones Journal of Clinical Endocrinology and Metabolism, 104 (12). pp. 6049-6059.

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Context: Studies suggest that female reproductive hormones are under circadian regulation, although methodological differences have led to inconsistent findings. Objective: To determine whether circulating levels of reproductive hormones exhibit circadian rhythms. Design: Blood samples were collected across �90 consecutive hours, including 2 baseline days under a standard sleep-wake schedule and �50 hours of extended wake under constant routine (CR) conditions. Setting: Intensive Physiological Monitoring Unit, Brigham and Women's Hospital. Participants: Seventeen healthy premenopausal women (22.8 ± 2.6 years; nine follicular; eight luteal). Interventions: Fifty-hour CR. Main Outcome Measures: Plasma estradiol (E2), progesterone (P4), LH, FSH, SHBG, melatonin, and core body temperature. Results: All hormones exhibited significant 24-hour rhythms under both standard sleep-wake and CR conditions during the follicular phase (P < 0.05). In contrast, only FSH and SHBG were significantly rhythmic during the luteal phase. Rhythm acrophases and amplitudes were similar between standard sleep-wake and CR conditions. The acrophase occurred in the morning for P4; in the afternoon for FSH, LH, and SHBG; and during the night for E2. Conclusions: Our results confirm previous reports of �24-hour rhythms in many female reproductive hormones in humans under ambulatory conditions but demonstrate that these hormones are under endogenous circadian regulation, defined as persisting in the absence of external time cues. These results may have important implications for the effects of circadian disruption on reproductive function. Copyright © 2019 Endocrine Society.

Item Type: Article
Authors :
Rahman, S.A.
Grant, L.K.
Gooley, J.J.
Rajaratnam, S.M.W.
Czeisler, C.A.
Date : 2019
DOI : 10.1210/jc.2019-00803
Uncontrolled Keywords : estradiol, follitropin, luteinizing hormone, melatonin, progesterone, sex hormone, sex hormone binding globulin, estradiol, follitropin, luteinizing hormone, melatonin, progesterone, sex hormone binding globulin, SHBG protein, human, adult, Article, Australia, blood sampling, circadian rhythm, controlled study, core temperature, estradiol blood level, female, follicular phase, follitropin blood level, hormonal regulation, human, luteal phase, luteinizing hormone blood level, premenopause, priority journal, progesterone blood level, protein blood level, sleep waking cycle, blood, body temperature, circadian rhythm, metabolism, physiologic monitoring, physiology, procedures, sleep, wakefulness, young adult, Adult, Body Temperature, Circadian Rhythm, Estradiol, Female, Follicle Stimulating Hormone, Follicular Phase, Humans, Luteinizing Hormone, Melatonin, Monitoring, Physiologic, Progesterone, Sex Hormone-Binding Globulin, Sleep, Wakefulness, Young Adult
Depositing User : Clive Harris
Date Deposited : 17 Jun 2020 00:33
Last Modified : 17 Jun 2020 00:33

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