Dehydroepiandrosterone 7α-hydroxylation in human tissues: Possible interference with type 1 11β-hydroxysteroid dehydrogenase-mediated processes
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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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].”
From Steroidogenesis in the skin: Implications for local immune functions (2013) · cites this paper as [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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Altered Steroidome in Women with Multiple Sclerosis
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7-oxygenated Derivatives of Dehydroepiandrosterone and Obesity
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A native steroid hormone derivative triggers the resolution of inflammation
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Effect of Treatment on Steroidome in Women with Multiple Sclerosis
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Screening Dietary Herbs for Health Intervention on Mass Cadmium PoisoningPreprint
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Glucocorticoid metabolism and activation
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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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