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Updated: Aug 24, 2025

Author Spotlight: Semi-Automated Isolation of the Stromal Vascular Fraction from Murine White Adipose Tissue Using a Tissue Dissociator
Published on: May 19, 2023
17β-hydroxysteroid dehydrogenase type 2 activity, expression and cellular localization in abdominal adipose tissues
Mohamed Fouad Mansour1,2, Sophie Blanchette1, Mélissa Pelletier1
1Québec Heart and Lung Institute Research Center, Université Laval, Québec, Québec, Canada.
Context:
17β-hydroxysteroid dehydrogenase type 2 (17β-HSD2) may be involved in the local modulation of estradiol (E2) availability in adipose tissues.
Objective:
To assess the conversion of E2 into estrone (E1) as well as the expression of 17β-HSD2 and its localization in omental (OM) and subcutaneous (SC) adipose tissues obtained from women.
Methods:
Rates of 14 C-E1 formation from 14 C-E2 were measured in OM and SC adipose tissue homogenates from 29 women. Specific 17β-HSD2 inhibitor EM-919 was tested in OM and SC adipose tissue homogenates (n = 6). 17β-HSD2 mRNA expression was measured in whole OM and SC adipose tissues (n = 14). Cellular localization of the enzyme was examined using immunohistochemistry. Anthropometric measurements were obtained and body composition as well as body fat distribution were measured.
Results:
Significant 14 C-E1 formation from 14 C-E2 in OM and SC tissue homogenates was detected. The rate of 14 C-E1 formation was significantly higher in OM than SC adipose tissue (p < .0001). The conversion of 14 C-E2 to 14 C-E1 was significantly inhibited by EM-919 in OM (p < .05) and SC (p < .05) adipose tissues. Significantly higher expression of 17β-HSD2 mRNA in OM versus SC fat was found (p = .03). 17β-HSD2 was localized in the vasculature of OM and SC tissues. Significant negative associations were detected between OM 17β-HSD2 activity and body mass index, WC, lean body mass as well as SC adipose tissue areas.
Conclusion:
17β-HSD2 converts E2 to E1 in OM and SC adipose tissues of women. The activity of this enzyme decreases with increasing adiposity.
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