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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...
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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.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH...
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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...
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Menopause01:28

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Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
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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...
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Inflammation and Ovarian Function in Reproductive-Aged Women.

Anneliese Long1,2, Anne Z Steiner3, Amanda L Thompson1,2,4

  • 1Department of Anthropology, University of North Carolina, Chapel Hill, North Carolina, USA.

American Journal of Human Biology : the Official Journal of the Human Biology Council
|December 3, 2024
PubMed
Summary
This summary is machine-generated.

Inflammation, measured by C-reactive protein, is linked to lower levels of inhibin B and follicle-stimulating hormone in the early follicular phase. This suggests inflammation may impact ovarian function, but not necessarily diminished ovarian reserve.

Keywords:
C‐reactive proteinanti‐Müllerian hormonefollicle‐stimulating hormone ovarian functioninflammationinhibin B

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Area of Science:

  • Reproductive Endocrinology
  • Immunology
  • Women's Health

Background:

  • Inflammation, a marker of immune activation, can affect ovarian and luteal function, crucial for pregnancy.
  • Elevated inflammation may indicate ovarian dysfunction, potentially reflected in Anti-Müllerian hormone (AMH), follicle-stimulating hormone (FSH), and inhibin B levels.

Purpose of the Study:

  • To investigate the relationship between C-reactive protein (CRP), a marker of inflammation, and key ovarian function biomarkers (AMH, FSH, inhibin B) during the early follicular phase.
  • To assess if inflammation correlates with diminished ovarian reserve.

Main Methods:

  • Secondary analysis of data from the Time to Conceive prospective cohort study (2008-2016).
  • Included 703 women aged 30-44 years attempting pregnancy, with no history of infertility or relevant conditions.
  • Measured serum CRP, AMH, FSH, and inhibin B during days 2-4 of the menstrual cycle.

Main Results:

  • A 20% increase in CRP was associated with a decrease in inhibin B and FSH levels.
  • No significant relationship was found between CRP and AMH or the odds of diminished ovarian reserve.
  • A trend suggested a potential increase in AMH with higher CRP, though not statistically significant.

Conclusions:

  • Inflammation, indicated by CRP, is associated with specific biomarkers of ovarian function (FSH, inhibin B) in the early follicular phase.
  • The findings suggest a potential role for inflammation in modulating ovarian function.
  • CRP levels were not significantly linked to diminished ovarian reserve in this cohort.