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Hormonal Control of the Ovarian Cycle

Hormonal Control of the Ovarian Cycle

The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle. At puberty, GnRH secretion increases in both frequency and...

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The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
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Ovarian Cycle

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The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle length...

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Oogenesis

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Oogenesis, the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
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Melatonin and the ovary: physiological and pathophysiological implications.

Hiroshi Tamura¹, Yasuhiko Nakamura, Ahmet Korkmaz

¹Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA.

Fertility and Sterility

|September 23, 2008

Summary

Melatonin is crucial for ovarian function, acting as an antioxidant and influencing reproductive processes. This research highlights its potential therapeutic use for improving ovarian health and managing reproductive disorders.

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Area of Science:

Reproductive Endocrinology
Molecular Physiology
Ovarian Biology

Background:

Melatonin is present in human follicular fluid and ovarian cells.
Reactive oxygen species and apoptosis are key in ovarian function.

Purpose of the Study:

To elucidate the physiological and pathophysiological roles of melatonin in the human ovary.

Main Methods:

Literature review.

Main Results:

Melatonin directly impacts ovarian function, including folliculogenesis and ovulation.
Melatonin acts as a potent antioxidant, scavenging free radicals.
Evidence supports melatonin's local role in human reproduction and potential involvement in PCOS and POF.

Conclusions:

Melatonin is essential for human ovarian function.
Melatonin shows promise as a therapeutic agent for enhancing ovarian function and oocyte quality.
Further research may lead to new treatments for ovarian diseases.