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Related Concept Videos

Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Oogenesis01:22

Oogenesis

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.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...
Disorders of the Female Reproductive System01:24

Disorders of the Female Reproductive System

The female reproductive system can be affected by several disorders, including Premenstrual Syndrome (PMS), Premenstrual Dysphoric Disorder (PMDD), endometriosis, and various forms of cancer. PMS and PMDD are cyclical conditions that cause physical and emotional distress, with symptoms that include edema, mood swings, and food cravings. PMDD is a more severe form of PMS characterized by increased symptom severity that peaks during the luteal phase and tends to improve or resolve shortly after...
Ovarian Cycle01:27

Ovarian Cycle

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...
Hormonal Control of the Ovarian Cycle01:30

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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Cushing Syndrome II: Pathophysiology

Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...

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Evaluation of Hepatic Glucose Production in a Polycystic Ovary Syndrome Mouse Model
09:44

Evaluation of Hepatic Glucose Production in a Polycystic Ovary Syndrome Mouse Model

Published on: March 5, 2022

Polycystic ovary syndrome.

Constance Y Baldwin1, Selma Feldman Witchel

  • 1Division of Pediatric Endocrinology, Children's Hospital of Pittsburgh, University of Pittsburgh, PA 15213, USA.

Pediatric Annals
|January 24, 2007
PubMed
Summary

Polycystic ovary syndrome (PCOS) is a common endocrine disorder. Identifying early predictors in childhood, like precocious puberty (PP), is crucial for preventing long-term reproductive, metabolic, and cardiovascular complications.

Area of Science:

  • Endocrinology
  • Pediatrics
  • Reproductive Health

Background:

  • Polycystic ovary syndrome (PCOS) is a prevalent endocrine disorder with significant reproductive, metabolic, and cardiovascular health implications.
  • Early signs of PCOS can manifest in childhood, often associated with precocious puberty (PP).
  • Not all individuals experiencing PP develop PCOS, highlighting a need to understand predictive factors.

Purpose of the Study:

  • To investigate the factors that predict the progression from precocious puberty (PP) to polycystic ovary syndrome (PCOS).
  • To gain insights into the fundamental mechanisms underlying PCOS development.
  • To support pediatric disease prevention by identifying at-risk individuals early.

Main Methods:

  • The study focuses on investigating predictive factors for PCOS development in girls with PP.

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A Hyperandrogenic Mouse Model to Study Polycystic Ovary Syndrome

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  • Utilizes observational data to identify correlations between childhood indicators and later PCOS diagnosis.
  • Employs a multifactorial and polygenic approach to understand disease etiology.

    • Main Results:

    • Early identification of risk factors for PCOS during childhood is essential.
    • Understanding progression from PP to PCOS can reveal key developmental mechanisms.
    • Early detection strategies can benefit individuals, families, and public health.

    Conclusions:

    • Early detection of PCOS risk in childhood is a critical pediatric mission.
    • Identifying individuals at risk for PCOS, impaired glucose tolerance (IGT), and type 2 diabetes mellitus early offers significant benefits.
    • Further research into predictive factors for PCOS development is warranted for effective prevention.