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Orthotopic Ovarian Transplantation Procedures to Investigate the Life- and Health-span Influence of Ovarian Senescence in Female Mice
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Published on: February 12, 2018

Ovarian aging in squirrel monkeys (Saimiri sciureus).

Margaret L Walker1, Daniel C Anderson, James G Herndon

  • 1Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30329, USA. mlwalke@emory.edu

Reproduction (Cambridge, England)
|August 7, 2009
PubMed
Summary
This summary is machine-generated.

Female squirrel monkeys experience ovarian follicle depletion with age. Unusual granulosa cell clusters appear in older monkeys, potentially influencing reproductive lifespan and offering insights into human granulosa cell tumors.

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Area of Science:

  • Reproductive biology
  • Comparative anatomy
  • Gerontology

Background:

  • Female squirrel monkeys (Saimiri sciureus) have a reproductive period from 2.5 years to mid-teens.
  • Ovarian aging involves complex cytological changes impacting fertility.
  • Understanding primate ovarian senescence is crucial for reproductive health research.

Purpose of the Study:

  • To investigate age-associated ovarian cytological changes in female squirrel monkeys.
  • To characterize the prevalence and nature of ovarian structures in aging monkeys.
  • To explore potential links between ovarian aging and reproductive potential.

Main Methods:

  • Histological examination of ovaries from 24 squirrel monkeys aged from newborn to 20 years.
  • Quantification of primordial follicles and assessment of granulosa cell clusters (GCCs).
  • Immunohistochemical analysis for anti-Müllerian hormone expression in GCCs.

Main Results:

  • A significant age-related decline in primordial follicle numbers was observed, most pronounced between birth and 5 years.
  • Few primordial follicles remained after 8 years of age.
  • Abundant, encapsulated granulosa cell clusters (GCCs), expressing anti-Müllerian hormone, emerged in older monkeys (post-8 years) and were histologically similar to human granulosa cell tumors but lacked malignancy.

Conclusions:

  • Reproductive senescence in female squirrel monkeys is characterized by progressive ovarian follicle depletion.
  • The consistent presence of differentiated GCCs in older, reproductively active monkeys suggests a role in modulating later reproductive potential.
  • Studying GCCs in squirrel monkeys may provide valuable insights into the pathophysiology of human granulosa cell tumors.