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Polyploid cells in the mouse ovary.

Margaret A Keighren1, Leah P Macfadyen, Alan S Hill

  • 1Genes and Development Group, Division of Reproductive and Developmental Sciences, University of Edinburgh, Hugh Robson Building, George Square, Edinburgh, UK.

Journal of Anatomy
|July 9, 2003
PubMed
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Polyploid cells are present in mouse ovaries. Their increased abundance in the corpus luteum suggests cell ploidy is linked to ovarian differentiation and mating, not female age.

Area of Science:

  • Reproductive biology
  • Cellular biology
  • Genetics

Background:

  • Cell ploidy, the state of having more than two multiples of the haploid chromosome set, is a fundamental aspect of cell biology.
  • Understanding polyploidy in reproductive tissues is crucial for comprehending ovarian function and potential reproductive health implications.

Purpose of the Study:

  • To investigate the presence and frequency of polyploid cells within the ovarian follicle and corpus luteum in mice.
  • To determine if cell ploidy in these ovarian structures correlates with the age of the female or reproductive events like mating.

Main Methods:

  • Utilized DNA in situ hybridization targeting a chromosome 3 transgene in hemizygous mice.
  • Validated the technique using control tissues (kidney, pancreas, liver) with known polyploid cell frequencies.

Related Experiment Videos

  • Analyzed polyploid nuclei in histological sections of ovarian follicles and corpora lutea from mice aged 6 weeks to 10 months.

    • Main Results:

    • Polyploid nuclei were detected in both ovarian follicles and corpora lutea.
    • Polyploidy frequency in follicles did not correlate with female age.
    • Corpora lutea exhibited significantly higher polyploidy (6.3%) compared to ovarian follicles (2.5%).
    • Polyploidy was more frequent in corpora lutea of mated mice, irrespective of pregnancy.

    Conclusions:

    • The study confirms the presence of polyploid cells in the mouse ovary, specifically within follicles and corpora lutea.
    • Polyploid cell production is more strongly associated with the differentiation process of follicles into corpora lutea than with female aging.
    • Mating appears to be a potential trigger for increased polyploidy in the corpus luteum, warranting further investigation into its reproductive role.