Cited by 79Hormonal Regulation and HypertensionAdrenal Hormones and DisordersSteroid Chemistry and Biochemistry

Dehydroepiandrosterone 7α-hydroxylation in human tissues: Possible interference with type 1 11β-hydroxysteroid dehydrogenase-mediated processes

Hennebert, Olivier, Chalbot, Sonia, Alran, Severine, Morfin, Robert·2007·The Journal of Steroid Biochemistry and Molecular Biology

Abstract

Dehydroepiandrosterone (DHEA) is 7alpha-hydroxylated by the cytochome P450 7B1 (CYP7B1) in the human brain and liver. This produces 7alpha-hydroxy-DHEA that is a substrate for 11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1) which exists in the same tissues and carries out the inter-conversion of 7alpha- and 7beta-hydroxy-DHEA through a 7-oxo-intermediary. Since the role of 11beta-HSD1 is to transform the inactive cortisone into active cortisol, its competitive inhibition by 7alpha-hydroxy-DHEA may support the paradigm of native anti-glucocorticoid arising from DHEA. Therefore, our objective was to use human tissues to assess the presences of both CYP7B1 and 11beta-HSD1. Human skin was selected then and used to test its ability to produce 7alpha-hydroxy-DHEA, and to test the interference of 7alpha- and 7beta-hydroxy-DHEA and 7-oxo-DHEA with the 11beta-HSD1-mediated oxidoreduction of cortisol and cortisone. Immuno-histochemical studies showed the presence of both CYP7B1 and 11beta-HSD1 in the liver, skin and tonsils. DHEA was readily 7alpha-hydroxylated when incubated using skin slices. A S9 fraction of dermal homogenates containing the 11beta-HSD1 carried out the oxidoreduction of cortisol and cortisone. Inhibition of the cortisol oxidation by 7alpha-hydroxy-DHEA and 7beta-hydroxy-DHEA was competitive with a Ki at 1.85+/-0.495 and 0.255+/-0.005 microM, respectively. Inhibition of cortisone reduction by 7-oxo-DHEA was of a mixed type with a Ki at 1.13+/-0.15 microM. These findings may support the previously proposed native anti-glucocorticoid paradigm and suggest that the 7alpha-hydroxy-DHEA production is a key for the fine tuning of glucocorticoid levels in tissues.

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Crossref · 10.1016/j.jsbmb.2007.03.026

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  • Skin shows immunohistochemical reactivity for CYP7B1, which catalyzes 7α-hydroxylation of DHEA and converts DHT metabolites Aene-diol and 3-Adiol into compounds with little or no estrogenic effect.

    “Skin shows immunohistochemical reactivity for the enzyme CYP7B1, which catalyzes the 7α-hydroxylation of DHEA. Moreover, it turns the DHT metabolites 5-androstene-3β,17β-diol (Aene-diol) and 5-androstane-3β,17β-diol (3-Adiol) in compounds with little or no estrogenic effect [128].”
  • DHEA can be 7α-hydroxylated by CYP7B1, which is expressed in the skin, thereby preventing its metabolism to active androgens.

    “In addition, DHEA can be 7α-hydroxylated by CYP7B1, which is expressed in the skin (Hennebert et al., 2007), thereby preventing its metabolism to active androgens.”

    From Intracrine androgen biosynthesis, metabolism and action revisited (2018) · cites this paper as Hennebert et al., 2007

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Authors
Hennebert, O., Chalbot, S., Alran, S., & Morfin, R.
Affiliations
Conservatoire National des Arts et Métiers (FR)
Corresponding author
Morfin, Robert
Venue
The Journal of Steroid Biochemistry and Molecular Biology
Publisher
Elsevier BV
Published
2007-05
Volume
104
Issue
3-5
Pages
326-333
ISSN
0960-0760 (ISSN-L)
OpenAlex
W2005534385
Cited by
79
References
45
Citations by year
2025: 2 · 2024: 3 · 2023: 1 · 2022: 5 · 2021: 5 · 2020: 4 · 2019: 3 · 2018: 4 · 2017: 8 · 2016: 4 · 2015: 5 · 2014: 2 · 2013: 6 · 2012: 3
FWCI
4.14
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Steroid Biochemistry and Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal Regulation and Hypertension
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Steroid Chemistry and Biochemistry
Keywords
dehydroepiandrosterone, 7α-hydroxylation, CYP7B1, 11β-hydroxysteroid dehydrogenase type 1, competitive inhibition, human skin, liver, tonsil, glucocorticoid metabolism, cytochrome P450
MeSH terms
Cytochrome P450 Family 7, Cortisone, Cytochrome P-450 Enzyme System, Dehydroepiandrosterone, Female, Humans, Hydrocortisone, Hydroxylation, Immunohistochemistry, Male, Oxidation-Reduction, Skin, Steroid Hydroxylases, 11-beta-Hydroxysteroid Dehydrogenase Type 1, In Vitro Techniques

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