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Norgestimate (NG) and its metabolite (dNG) exhibit progestogen and weak estrogenic activities, partially explaining their effectiveness in treating moderate acne. Their mineralocorticoid receptor antagonist activity may also benefit cardiovascular health.

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Area of Science:

  • Endocrinology
  • Pharmacology
  • Dermatology

Background:

  • Acne is linked to androgen overstimulation or hypersensitivity of sebaceous glands.
  • Norgestimate (NG) combined with ethinyl estradiol (EE) effectively treats mild to moderate acne in women.
  • This efficacy is attributed to oral contraceptives' effects on androgens and NG's antiandrogenic properties.

Purpose of the Study:

  • To investigate potential steroid activities of norgestimate (NG) and its derivative 17-deacetylnorgestimate (dNG) beyond antiandrogen effects.
  • To assess the interaction of NG and dNG with progesterone, estrogen, glucocorticoid, and mineralocorticoid receptors.

Main Methods:

  • Utilized human cell lines responsive to progesterone receptor (PR), estrogen receptors (ERα and ERβ), glucocorticoid receptor (GR), and mineralocorticoid receptor (MR).
  • Evaluated the agonist and antagonist activities of NG and dNG on these steroid receptors.

Main Results:

  • NG and dNG demonstrated progestogen partial agonist activity (EC50: 13 and 11.1 nM) and ERα selective agonist activity (EC50: 30.4 and 43.4 nM).
  • They also exhibited low-affinity full antagonism for GR (IC50: 325 and 255 nM) and moderate affinity for MR (IC50: 81.2 and 83.7 nM).

Conclusions:

  • NG and dNG possess full progestogen and weak estrogenic (via ERα) properties, contributing to their efficacy in treating moderate acne when combined with EE.
  • The observed MR antagonist activity may offer benefits for cardiovascular risk, atherosclerosis, and lipid profiles.