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Related Experiment Videos

Regulation of ovarian function by catecholestrogens: current concepts.

L J Spicer1, J M Hammond

  • 1Department of Animal Science, Oklahoma State University, Stillwater 74078.

Journal of Steroid Biochemistry
|October 1, 1989
PubMed
Summary

2-hydroxy-estradiol (2-OH-E2) acts as an intraovarian regulator, influencing follicular development and progesterone production through a distinct mechanism. This catecholestrogen enhances gonadotropin and catecholamine actions, suggesting a novel role in ovarian function.

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Area of Science:

  • Reproductive Endocrinology
  • Ovarian Physiology
  • Steroidogenesis

Background:

  • Ovarian follicle development involves recruitment, selection, and dominance phases regulated by intraovarian mechanisms.
  • Catecholestrogens, such as 2-hydroxy-estradiol (2-OH-E2), are potential autocrine/paracrine regulators of follicular function.

Purpose of the Study:

  • To review evidence implicating 2-OH-E2 as an autocrine/paracrine regulator of ovarian follicular function.
  • To investigate the mechanism of action of 2-OH-E2 in vitro, comparing its effects to other hormones.

Main Methods:

  • Review of studies on 2-OH-E2 and its synthesizing enzyme, estrogen 2-hydroxylase (E-2-H), in human, equine, and porcine follicles.
  • In vitro experiments assessing the effects of 2-OH-E2 on progesterone production, alone and in combination with E2, gonadotropins, catecholamines, and androgens.

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  • Examination of hormonal antagonists to elucidate the mechanism of action of 2-OH-E2 and other stimulators.

    • Main Results:

    • 2-OH-E2 is present in human and equine follicular fluid; E-2-H is abundant in porcine granulosa and thecal cells with increasing activity during follicular development.
    • 2-OH-E2 significantly stimulates progesterone production, with effects comparable to E2 and gonadotropins, and additive to other tested compounds, suggesting a distinct mechanism.
    • Hydroxyflutamide exhibited both antiandrogen and anticatecholestrogen activity, while other anti-hormones did not inhibit 2-OH-E2 action, supporting a unique signaling pathway.

    Conclusions:

    • 2-OH-E2 acts via a mechanism distinct from E2, catecholamines, and androgens, potentially involving stimulation of side-chain cleavage enzyme activity.
    • 2-OH-E2 enhances cAMP production stimulated by epinephrine, LH, and FSH, possibly by increasing beta-adrenergic receptor density.
    • Further research is needed to determine if 2-OH-E2 increases LH and FSH receptor numbers.