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Related Experiment Videos

Progesterone inhibits apolipoprotein-mediated cellular lipid release: a putative mechanism for the decrease of

K Kojima1, S Abe-Dohmae, R Arakawa

  • 1Department of Obstetrics and Gynecology, Nagoya City University Medical School, Nagoya, Japan.

Biochimica Et Biophysica Acta
|July 27, 2001
PubMed
Summary
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Progesterone, but not estradiol, inhibits the cellular removal of cholesterol and phospholipid, reducing high-density lipoprotein (HDL) assembly. This may explain why progestogens lower HDL levels in women undergoing hormone therapy.

Area of Science:

  • Endocrinology
  • Lipid Metabolism
  • Molecular Biology

Background:

  • Female gonadal hormones influence plasma lipid profiles, particularly high-density lipoprotein (HDL) levels.
  • The precise mechanisms by which hormones like estradiol and progestogens affect HDL metabolism are not fully understood.

Purpose of the Study:

  • To investigate the in vitro effects of 17 beta-estradiol and progestogens on the assembly of HDL particles.
  • To elucidate the role of these hormones in the interaction between free apolipoprotein A-I (apoA-I) and cellular lipids.

Main Methods:

  • Assessing the ability of apoA-I to generate HDL particles by removing cholesterol and phospholipid from human fibroblasts (MRC-5).
  • Examining the influence of 17 beta-estradiol and progesterone on cellular cholesterol and phospholipid removal.

Related Experiment Videos

  • Analyzing the impact of progesterone on intracellular cholesterol compartments and cell-surface cholesterol accessibility.

    • Main Results:

    • Progesterone significantly suppressed the removal of both cholesterol and phospholipid by apoA-I, with a greater effect on cholesterol.
    • Synthetic progestogens exhibited similar inhibitory effects on cellular cholesterol release.
    • Progesterone altered the intracellular distribution of newly synthesized cholesterol, favoring the esterified compartment, without affecting overall cholesterol ratios or cell-surface cholesterol.

    Conclusions:

    • Progesterone primarily affects the intracellular cholesterol pool involved in apoA-I-mediated HDL assembly.
    • This mechanism offers a potential explanation for the observed decrease in plasma HDL levels associated with progestogen administration in hormone replacement therapy.