Cited by 82Estrogen and related hormone effectsAdrenal Hormones and DisordersHormonal and reproductive studies

The DOI matches its Crossref record; 70 of the 70 references it cites were found in a registry or an index.

Science of intracrinology in postmenopausal women

Abstract

OBJECTIVE: To illustrate the marked differences between classical endocrinology that distributes hormones to all tissues of the body through the bloodstream and the science of intracrinology, whereby each cell of each peripheral tissue makes a small and appropriate amount of estrogens and androgens from the inactive precursor dehydroepiandrosterone (DHEA), DHEA being mainly of adrenal origin. Because only the inactivated sex steroids are released in the blood, influence in the other tissues is avoided. METHODS: Molecular biology has been used for the identification/characterization of the steroid-forming and steroid-inactivating enzymes, whereas steroids have been measured by mass spectrometry-based assays validated according to the US Food and Drug Administration guidelines. RESULTS: Evolution over 500 million years has engineered the expression of about 30 steroid-forming enzymes specific for each peripheral tissue. These tissue-specific enzymes transform DHEA into the appropriate small amounts of estrogens and androgens for a strictly intracellular and local action. Humans, contrary to species below primates, also possess intracellular steroid-inactivating enzymes, especially glucuronyl transferases and sulfotransferases, which inactivate the estrogens and androgens at their local site of formation, thus preventing the release of a biologically significant amount of estradiol (E2) and testosterone in the circulation. Since DHEA becomes the unique source of sex steroids after menopause, serum E2 and testosterone are thus maintained at low biologically inactive concentrations with no activity outside the cells of origin. DHEA secretion, unfortunately, starts decreasing at about the age of 30 at various rates in different women. Moreover, there is no feedback mechanism to increase DHEA secretion when the concentration of serum DHEA decreases. Considering this mechanism is unique to the human, it seems logical to replace DHEA locally in women suffering from vulvovaginal atrophy (genitourinary syndrome of menopause). The clinical data obtained using a small dose of intravaginal DHEA (prasterone) confirm the mechanisms of intracrinology mentioned above which avoid biologically significant changes in serum E2 and testosterone. CONCLUSIONS: The symptoms and signs of vulvovaginal atrophy (genitourinary syndrome of menopause) can be successfully treated by the intravaginal administration of DHEA without safety concerns. This strategy exclusively replaces in the vagina the missing cell-specific intracellular estrogens and androgens. This approach avoids systemic exposure and the potential risks of estrogen exposure for the tissues other than the vagina.

Overview

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Registry

Crossref · 10.1097/gme.0000000000000808

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70 of 70 references verified0 citation errors · 0 not checkable

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  • Following full initiation at puberty, gonadal androgen production decreases significantly after menopause in women, while in men the testicular output of testosterone gradually decreases with age, resulting in significantly lower combined androgen levels in men aged 60 and over.

    “Following full initiation at puberty gonadal androgen production decreases significantly after menopause in women, while in men the testicular output of testosterone gradually decreases with age, resulting in significantly lower combined androgen levels in men aged 60 and over [24,[280], [281], [282]].”

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Research works printed but not linked: 1

  1. Labrie, 2010, DHEA after menopause: sole source of sex steroids and potential sex steroid deficiency treatment, Menopause Manage, 19, 14

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Metadata

Authors
Labrie, F., Bélanger, A., Pelletier, G., Martel, C., Archer, D. F., & Utian, W. H.
Affiliations
  • Université Laval (CA)
  • Endoceutics Inc, Quebec City, Canada
  • Case Western Reserve University (US)
Corresponding author
Labrie, Fernand
Venue
Menopause
Published
2017-06
Volume
24
Issue
6
Pages
702-712
ISSN
  • 1072-3714 (ISSN-L)
  • 1530-0374
OpenAlex
W2573381134
Cited by
82
References
70
Citations by year
2026: 4 · 2025: 7 · 2024: 3 · 2023: 6 · 2022: 4 · 2021: 9 · 2020: 16 · 2019: 16 · 2018: 9 · 2017: 8
FWCI
1.73
Type
journal article
Language
en
Open access
closed
Locations
  • Menopause The Journal of The North American Menopause Society (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Estrogen and related hormone effects
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
Keywords
intracrinology, postmenopausal women, dehydroepiandrosterone, local estrogen synthesis, glucuronidation, sulfation, estradiol, testosterone, vaginal atrophy, genitourinary syndrome of menopause
MeSH terms
Androgens, Atrophy, Dehydroepiandrosterone, Enzyme Inhibitors, Enzymes, Estrogens, Female, Humans, Vagina, Postmenopause, Intracellular Space

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