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Related Experiment Videos

Do oestrogens regulate placental growth in the mouse?

B G Miller

    Australian Journal of Biological Sciences
    |June 1, 1980
    PubMed
    Summary

    Oestrogen (E2) does not appear to regulate placental growth in mice, even when administered with progesterone (P) after ovariectomy. This finding contrasts with observations in rats, highlighting species-specific differences in reproductive biology.

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    Area of Science:

    • Reproductive Biology
    • Developmental Biology
    • Endocrinology

    Background:

    • Placental growth is crucial for fetal development and is influenced by various factors including litter size and hormones.
    • Oestrogens are known regulators of reproductive processes, but their specific role in mouse placental growth requires clarification.

    Purpose of the Study:

    • To investigate the effects of litter size, ovariectomy, and oestradiol (E2) on placental growth in mice.
    • To determine if oestrogens play a regulatory role in mouse placental development, comparing findings to known mechanisms in rats.

    Main Methods:

    • Mice underwent surgical procedures (oviduct removal or unilateral ovariectomy) to manipulate litter size and induce unilateral pregnancy.
    • Placental growth was assessed by measuring DNA, protein, RNA:DNA ratios, and [5-3H]uridine incorporation into RNA.
    • Hormone treatments (progesterone and oestradiol) were administered following ovariectomy at different stages of pregnancy.

    Main Results:

    • Spontaneous placental hyperplasia due to small litter size occurred similarly in intact and ovariectomized mice treated with progesterone and oestradiol.
    • Ovariectomy on day 10 of pregnancy increased RNA synthesis in placentas of mice with larger litters.
    • Placental growth rates were comparable between control intact mice and those ovariectomized on day 5 and treated with progesterone and oestradiol.

    Conclusions:

    • Oestrogens do not appear to regulate placental growth in mice, contrary to potential roles suggested by studies in other species like rats.
    • The findings indicate species-specific hormonal regulation of placental development.

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