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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...
Ovaries01:26

Ovaries

The ovaries are roughly the size of almonds and measure approximately 2 to 3 centimeters in length. These paired structures are situated within the pelvic region and are anchored by the mesovarium—a peritoneal extension that also connects them to the wider structure of the broad ligament. The support system extends to the suspensory ligament, housing blood and lymphatic vessels. In addition, the ovarian ligament tethers the ovaries to the uterus.
On the ovarian surface, a layer of cuboidal...
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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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Related Experiment Video

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Bovine Ovarian Cortex Tissue Culture
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Differences in connective tissue gene expression between normally functioning, polycystic and post-menopausal

S Oksjoki1, O Rahkonen, M Haarala

  • 1Departments of Medical Biochemistry and Molecular Biology, Turku University Central Hospital, University of Turku, Turku, Finland.

Molecular Human Reproduction
|December 11, 2003
PubMed
Summary

Polycystic ovary syndrome (PCOS) is linked to altered extracellular matrix (ECM) gene expression. Specifically, type IV collagen and TIMP-3 levels are lower in PCOS ovaries, suggesting basement membrane involvement in the condition.

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Area of Science:

  • Reproductive biology
  • Molecular endocrinology
  • Gynecologic pathology

Background:

  • Polycystic ovary syndrome (PCOS) is characterized by arrested follicular maturation.
  • Ovarian follicles develop within the ovarian stroma, which is rich in extracellular matrix (ECM).
  • Limited data exist on ECM gene expression in polycystic ovaries.

Purpose of the Study:

  • To compare ECM gene expression in polycystic ovaries versus controls.
  • To investigate collagens, matrix metalloproteinases (MMPs), tissue inhibitors of metalloproteinases (TIMPs), and cathepsins.
  • To understand the role of ECM in PCOS pathogenesis.

Main Methods:

  • Northern blot analysis to assess mRNA levels.
  • Immunohistochemical staining for specific proteins.
  • Comparison of gene expression in PCOS ovaries with fertile and post-menopausal ovaries.

Main Results:

  • PCOS ovaries showed similar type I and III collagen mRNA to normal ovaries.
  • Proalpha1(IV) collagen and TIMP-3 mRNA levels were significantly lower in PCOS ovaries.
  • MMP-9 expression increased during the luteal phase in normal ovaries.
  • Post-menopausal ovaries had reduced collagen and osteonectin mRNA.
  • Immunohistochemistry indicated differences in MMP-9 and TIMP-4 between PCOS and normal ovaries.

Conclusions:

  • Ovarian function involves dynamic changes in ECM production and degradation.
  • Altered type IV collagen, TIMP-3, and TIMP-4 suggest basement membrane involvement in PCOS.
  • These findings highlight potential ECM-related mechanisms in PCOS development.