脂肪组织
内科学
内分泌学
芳香化酶
雄激素
脂肪细胞
分解代谢
生物
化学
激素
医学
新陈代谢
乳腺癌
癌症
作者
Giada Ostinelli,Sylvie Laforest,Scott G Denham,Martine Gauthier,Virginie Drolet-Labelle,Emma Scott,Frédéric‐Simon Hould,Simon Marceau,Natalie Homer,Catherine Bégin,Ruth Andrew,André Thewis
标识
DOI:10.1210/clinem/dgac261
摘要
Body fat distribution is a risk factor for obesity-associated comorbidities, and adipose tissue dysfunction plays a role in this association. In humans, there is a sex difference in body fat distribution, and steroid hormones are known to regulate several cellular processes within adipose tissue.Our aim was to investigate if intra-adipose steroid concentration and expression or activity of steroidogenic enzymes were associated with features of adipose tissue dysfunction in individuals with severe obesity.Samples from 40 bariatric candidates (31 women, 9 men) were included in the study. Visceral (VAT) and subcutaneous adipose tissue (SAT) were collected during surgery. Adipose tissue morphology was measured by a combination of histological staining and semi-automated quantification. Following extraction, intra-adipose and plasma steroid concentrations were determined by liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS). Aromatase activity was estimated using product over substrate ratio, while AKR1C2 activity was measured directly by fluorogenic probe. Gene expression was measured by quantitative PCR.VAT aromatase activity was positively associated with VAT adipocyte hypertrophy (P valueadj < 0.01) and negatively with plasma high-density lipoprotein (HDL)-cholesterol (P valueadj < 0.01), while SAT aromatase activity predicted dyslipidemia in women even after adjustment for waist circumference, age, and hormonal contraceptive use. We additionally compared women with high and low visceral adiposity index (VAI) and found that VAT excess is characterized by adipose tissue dysfunction, increased androgen catabolism mirrored by increased AKR1C2 activity, and higher aromatase expression and activity indices.In women, increased androgen catabolism or aromatization is associated with visceral adiposity and adipose tissue dysfunction.
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