Testosterone is sequestered in dysfunctional adipose tissue, modifying androgen-responsive genes

Background/objective The recognized association between male hypogonadism and obesity has multifactorial implications on adipose tissue (AT) physiology. The fat solubility of testosterone (T) suggests a sequestration process in fat depots, leading to reduced circulating levels of T in obesity. Sever...

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Veröffentlicht in:International Journal of Obesity 2020-07, Vol.44 (7), p.1617-1625
Hauptverfasser: Di Nisio, Andrea, Sabovic, Iva, De Toni, Luca, Rocca, Maria Santa, Dall’Acqua, Stefano, Azzena, Bruno, De Rocco Ponce, Maurizio, Foresta, Carlo
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container_issue 7
container_start_page 1617
container_title International Journal of Obesity
container_volume 44
creator Di Nisio, Andrea
Sabovic, Iva
De Toni, Luca
Rocca, Maria Santa
Dall’Acqua, Stefano
Azzena, Bruno
De Rocco Ponce, Maurizio
Foresta, Carlo
description Background/objective The recognized association between male hypogonadism and obesity has multifactorial implications on adipose tissue (AT) physiology. The fat solubility of testosterone (T) suggests a sequestration process in fat depots, leading to reduced circulating levels of T in obesity. Several evidence suggest that steroids play a two-sided inhibitory role on adipogenesis by locally decreasing lipid accumulation and by stimulating lipolysis. The current study investigates T trafficking and activity in dysfunctional AT. Subjects/methods Samples of subcutaneous AT (SAT) were obtained from explants from lipoaspirate plastic surgery in six obese and six normal weight male patients. Experimental procedures on both SAT explants and insulin-resistant (IR) 3T3-L1 adipocytes were performed, including real-time PCR and mass-spectrometry quantification. Results A significant deregulation of gene responsiveness to androgens in IR cells and obese SAT was observed (all p  
doi_str_mv 10.1038/s41366-020-0568-9
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The fat solubility of testosterone (T) suggests a sequestration process in fat depots, leading to reduced circulating levels of T in obesity. Several evidence suggest that steroids play a two-sided inhibitory role on adipogenesis by locally decreasing lipid accumulation and by stimulating lipolysis. The current study investigates T trafficking and activity in dysfunctional AT. Subjects/methods Samples of subcutaneous AT (SAT) were obtained from explants from lipoaspirate plastic surgery in six obese and six normal weight male patients. Experimental procedures on both SAT explants and insulin-resistant (IR) 3T3-L1 adipocytes were performed, including real-time PCR and mass-spectrometry quantification. Results A significant deregulation of gene responsiveness to androgens in IR cells and obese SAT was observed (all p  &lt; 0.05), together with reduced T release after adrenergic stimulation (−10% compared with −55% in lean SAT, p  = 0.021). Higher concentrations of intracellular T and estradiol in obese SAT were also observed (2.4 vs. 1.3 ng/g, p  = 0.013 and 0.075 vs. 0.22 ng/g, p  = 0.004, respectively). Testosterone accumulation resulted in even lower expression in androgen-responsive genes involved in lipolytic and anti-adipogenic pathways from both in vitro and ex vivo experiments. Conclusions These results suggest an altered response of dysfunctional fat cells to testosterone stimulation, which normally favors lipolysis and induces an anti-adipogenic effect. The considerable reduction of lipolytic T release after adrenergic stimulation in obese SAT contributes to AT dysfunction, in a feedforward loop further reducing T levels in obese hypogonadal males.</description><identifier>ISSN: 0307-0565</identifier><identifier>EISSN: 1476-5497</identifier><identifier>DOI: 10.1038/s41366-020-0568-9</identifier><identifier>PMID: 32203110</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>13/106 ; 17β-Estradiol ; 38/39 ; 38/77 ; 38/90 ; 631/443/319/2723 ; 692/163/2743/393 ; 82/58 ; Accumulation ; Adipocytes ; Adipogenesis ; Adipose tissue ; Adipose tissues ; Androgens ; Body fat ; Deregulation ; Epidemiology ; Explants ; Gene expression ; Genes ; Health Promotion and Disease Prevention ; Hypogonadism ; Insulin ; Internal Medicine ; Lipids ; Lipolysis ; Medicine ; Medicine &amp; Public Health ; Metabolic Diseases ; Obesity ; Physiological aspects ; Plastic surgery ; Public Health ; Sex hormones ; Spectrometry ; Steroid hormones ; Steroids ; Stimulation ; Surgery ; Surgery, Plastic ; Testosterone</subject><ispartof>International Journal of Obesity, 2020-07, Vol.44 (7), p.1617-1625</ispartof><rights>The Author(s), under exclusive licence to Springer Nature Limited 2020</rights><rights>COPYRIGHT 2020 Nature Publishing Group</rights><rights>The Author(s), under exclusive licence to Springer Nature Limited 2020.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c498t-f9e28152d17f86b78a0ceb8b31b98801775ae2f53b368f706a8f774aa14b15613</citedby><cites>FETCH-LOGICAL-c498t-f9e28152d17f86b78a0ceb8b31b98801775ae2f53b368f706a8f774aa14b15613</cites><orcidid>0000-0002-6576-2183</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/32203110$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Di Nisio, Andrea</creatorcontrib><creatorcontrib>Sabovic, Iva</creatorcontrib><creatorcontrib>De Toni, Luca</creatorcontrib><creatorcontrib>Rocca, Maria Santa</creatorcontrib><creatorcontrib>Dall’Acqua, Stefano</creatorcontrib><creatorcontrib>Azzena, Bruno</creatorcontrib><creatorcontrib>De Rocco Ponce, Maurizio</creatorcontrib><creatorcontrib>Foresta, Carlo</creatorcontrib><title>Testosterone is sequestered in dysfunctional adipose tissue, modifying androgen-responsive genes</title><title>International Journal of Obesity</title><addtitle>Int J Obes</addtitle><addtitle>Int J Obes (Lond)</addtitle><description>Background/objective The recognized association between male hypogonadism and obesity has multifactorial implications on adipose tissue (AT) physiology. The fat solubility of testosterone (T) suggests a sequestration process in fat depots, leading to reduced circulating levels of T in obesity. Several evidence suggest that steroids play a two-sided inhibitory role on adipogenesis by locally decreasing lipid accumulation and by stimulating lipolysis. The current study investigates T trafficking and activity in dysfunctional AT. Subjects/methods Samples of subcutaneous AT (SAT) were obtained from explants from lipoaspirate plastic surgery in six obese and six normal weight male patients. Experimental procedures on both SAT explants and insulin-resistant (IR) 3T3-L1 adipocytes were performed, including real-time PCR and mass-spectrometry quantification. Results A significant deregulation of gene responsiveness to androgens in IR cells and obese SAT was observed (all p  &lt; 0.05), together with reduced T release after adrenergic stimulation (−10% compared with −55% in lean SAT, p  = 0.021). Higher concentrations of intracellular T and estradiol in obese SAT were also observed (2.4 vs. 1.3 ng/g, p  = 0.013 and 0.075 vs. 0.22 ng/g, p  = 0.004, respectively). Testosterone accumulation resulted in even lower expression in androgen-responsive genes involved in lipolytic and anti-adipogenic pathways from both in vitro and ex vivo experiments. Conclusions These results suggest an altered response of dysfunctional fat cells to testosterone stimulation, which normally favors lipolysis and induces an anti-adipogenic effect. 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The fat solubility of testosterone (T) suggests a sequestration process in fat depots, leading to reduced circulating levels of T in obesity. Several evidence suggest that steroids play a two-sided inhibitory role on adipogenesis by locally decreasing lipid accumulation and by stimulating lipolysis. The current study investigates T trafficking and activity in dysfunctional AT. Subjects/methods Samples of subcutaneous AT (SAT) were obtained from explants from lipoaspirate plastic surgery in six obese and six normal weight male patients. Experimental procedures on both SAT explants and insulin-resistant (IR) 3T3-L1 adipocytes were performed, including real-time PCR and mass-spectrometry quantification. Results A significant deregulation of gene responsiveness to androgens in IR cells and obese SAT was observed (all p  &lt; 0.05), together with reduced T release after adrenergic stimulation (−10% compared with −55% in lean SAT, p  = 0.021). Higher concentrations of intracellular T and estradiol in obese SAT were also observed (2.4 vs. 1.3 ng/g, p  = 0.013 and 0.075 vs. 0.22 ng/g, p  = 0.004, respectively). Testosterone accumulation resulted in even lower expression in androgen-responsive genes involved in lipolytic and anti-adipogenic pathways from both in vitro and ex vivo experiments. Conclusions These results suggest an altered response of dysfunctional fat cells to testosterone stimulation, which normally favors lipolysis and induces an anti-adipogenic effect. The considerable reduction of lipolytic T release after adrenergic stimulation in obese SAT contributes to AT dysfunction, in a feedforward loop further reducing T levels in obese hypogonadal males.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>32203110</pmid><doi>10.1038/s41366-020-0568-9</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0002-6576-2183</orcidid></addata></record>
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subjects 13/106
17β-Estradiol
38/39
38/77
38/90
631/443/319/2723
692/163/2743/393
82/58
Accumulation
Adipocytes
Adipogenesis
Adipose tissue
Adipose tissues
Androgens
Body fat
Deregulation
Epidemiology
Explants
Gene expression
Genes
Health Promotion and Disease Prevention
Hypogonadism
Insulin
Internal Medicine
Lipids
Lipolysis
Medicine
Medicine & Public Health
Metabolic Diseases
Obesity
Physiological aspects
Plastic surgery
Public Health
Sex hormones
Spectrometry
Steroid hormones
Steroids
Stimulation
Surgery
Surgery, Plastic
Testosterone
title Testosterone is sequestered in dysfunctional adipose tissue, modifying androgen-responsive genes
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