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Androgens Modulate Glucocorticoid Receptor Activity in Adipose Tissue and Liver

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Androgens Modulate Glucocorticoid Receptor Activity in Adipose Tissue and Liver 240 1 Journal of D C E Spaanderman et al. Androgens modulate metabolic 240:1 51–63 Endocrinology GR activity RESEARCH Androgens modulate glucocorticoid receptor activity in adipose tissue and liver Dieuwertje C E Spaanderman1,2, Mark Nixon3, Jacobus C Buurstede1,2, Hetty H C M Sips1,2, Maaike Schilperoort1,2, Eline N Kuipers1,2, Emma A Backer1,2, Sander Kooijman1,2, Patrick C N Rensen1,2, Natalie Z M Homer3, Brian R Walker3,4, Onno C Meijer1,2 and Jan Kroon1,2 1Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, the Netherlands 2Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, the Netherlands 3BHF Centre for Cardiovascular Science, The Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom 4Institute for Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom Correspondence should be addressed to J Kroon: [email protected] Abstract Glucocorticoid signaling is context dependent, and in certain scenarios, glucocorticoid Key Words receptors (GRs) are able to engage with other members of the nuclear receptor f 11BHSD1 subfamily. Glucocorticoid signaling can exert sexually dimorphic effects, suggesting a f androgen receptor possible interaction with androgen sex hormones. We therefore set out to determine f Cushing’s disease the crosstalk between glucocorticoids and androgens in metabolic tissues including f glucocorticoid receptor white adipose tissue, liver and brown adipose tissue. Thereto we exposed male C57BL/6J f hyperlipidaemia mice to elevated levels of corticosterone in combination with an androgen receptor (AR) agonist or an AR antagonist. Systemic and local glucocorticoid levels were determined by mass spectrometry, and tissue expression of glucocorticoid-responsive genes and protein was measured by RT-qPCR and Western blot, respectively. To evaluate crosstalk in vitro, cultured white and brown adipocytes were exposed to a combination of corticosterone and an AR agonist. We found that AR agonism potentiated transcriptional response to GR in vitro in white and brown adipocytes and in vivo in white and brown adipose tissues. Conversely, AR antagonism substantially attenuated glucocorticoid signaling in white adipose tissue and liver. In white adipose tissue, this effect could partially be attributed to decreased 11B-hydroxysteroid dehydrogenase type 1-mediated glucocorticoid regeneration upon AR antagonism. In liver, attenuated GR activity was independent of active glucocorticoid ligand levels. We conclude that androgen signaling Journal of Endocrinology modulates GR transcriptional output in a tissue-specific manner. (2019) 240, 51–63 Introduction Glucocorticoids are adrenal steroid hormones engaged inducing adipose tissue lipolysis (Kadmiel & Cidlowski in a myriad of functions including adaptation to 2013). Due to the pleiotropic nature of glucocorticoid stress, circadian function and immune regulation. signaling, dysregulation inevitably endangers metabolic Glucocorticoids also mediate quintessential processes health. This is seen in Cushing’s syndrome, where in metabolic physiology to ensure whole-body energy glucocorticoid excess causes massive accumulation homeostasis for example by stimulating hepatic and redistribution of energy stores, accompanied by gluconeogenesis, reducing peripheral glucose uptake and cardiometabolic harm (Morgan et al. 2016). https://joe.bioscientifica.com © 2019 Society for Endocrinology https://doi.org/10.1530/JOE-18-0503 Published by Bioscientifica Ltd. Printed in Great Britain Downloaded from Bioscientifica.com at 09/29/2021 02:44:42PM via free access -18-0503 Journal of D C E Spaanderman et al. Androgens modulate metabolic 240:1 52 Endocrinology GR activity Glucocorticoid action in metabolism is However, beyond cancer the crosstalk between GR and AR predominantly mediated by glucocorticoid receptors has remained elusive. (GRs) which are expressed in virtually all tissues in both In this study, we explored if crosstalk between humans and rodents. It is known that glucocorticoid androgens and glucocorticoids exists in metabolic transcriptional activity is subject to multiple levels of tissues. In male C57BL/6J mice, we investigated possible regulation; from the production, secretion and tissue interactions in white adipose tissue (WAT), liver and uptake/export of steroid ligands to receptor expression brown adipose tissue (BAT) – all metabolically-active and DNA binding. Intracellular enzymatic (in)activation tissues that contribute considerably to whole-body controls glucocorticoid activity, i.e. 11B-hydroxysteroid metabolism. We reveal that androgen signaling strongly dehydrogenase type 1 (11B-HSD1) catalyzes influences metabolic GR signaling and that the underlying glucocorticoid regeneration from inactive steroid while mechanisms are highly tissue specific. 11β-hydroxysteroid dehydrogenase type 2 (11B-HSD2) inactivates the active ligand pool. Active ligand binding to GR provokes its translocation from the cytoplasm to Material and methods the nucleus. GR binds DNA at so-called glucocorticoid Animals response elements thereby facilitating gene induction or repression (Ratman et al. 2013). All animal studies were approved by the ethical committee The extent of GR-regulated transcriptional activity of Leiden University Medical Center. Mice were housed is dictated by ligand availability, receptor expression in conventional cages with a 12:12-h light-darkness cycle and the DNA-binding site (Meijsing et al. 2009), but also and ad libitum access to food and water. To examine the by interactions with coregulatory proteins and other effect of AR signaling on metabolic glucocorticoid action, (often unknown) signaling partners (Meijer et al. 2005). 8-week old male C57BL6/J mice (Jackson Laboratory) Glucocorticoids therefore act in a context-dependent were exposed to the GR agonist corticosterone (CORT; manner, and it was previously shown that glucocorticoids Sigma-Aldrich) and AR agonist dihydrotestosterone can have sexually dimorphic actions (Duma et al. 2010, (DHT; 5α-Androstan-17β-ol-3-one, Sigma-Aldrich) via Quinn & Cidlowski 2016). For example, in the liver the subcutaneous implantation of slow-release pellets (100 mg). synthetic glucocorticoid dexamethasone differentially The AR antagonist Enzalutamide (MedChemExpress) affects expression of many GR target genes in male vs was administered via diet supplementation (357 mg female rats (Duma et al. 2010). Such sexually dimorphic drug per kg diet; resulting in an estimated dose of effects could possibly be explained by glucocorticoid 40 mg/kg/day). The following experimental groups were interactions with sex hormone signaling, e.g. androgen followed for a period of 14 days: (1) Vehicle (N = 6), (2) receptor (AR) activity. AR signaling is known to regulate CORT (20 mg corticosterone; N = 7), (3) CORT+DHT (20 mg physiological processes like adipose tissue lipolysis and corticosterone, 30 mg DHT; N = 7) and (4) CORT + Enza hepatic glucose and lipid metabolism (Lee et al. 2013, (20 mg corticosterone + Enzalutamide treatment; N = 7). Shen & Shi 2015), but it is yet unclear if AR signaling can At baseline and after 14 days, body weight was measured contribute to the sexually dimorphic effects of GR. with a scale and body composition was determined by In certain contexts, GRs are able to engage with other echo-MRI. After 7 days of intervention, mice were fasted members of the steroid nuclear receptor subfamily (Chen for 6 h and blood was collected for analysis of plasma et al. 1997, Mifsud & Reul 2016). All six nuclear steroid triglycerides, cholesterol and free fatty acids. After 14 days receptors, including the GR and the AR, originate from a mice were killed by CO2 inhalation, blood was drawn via common ancestral receptor gene (Thornton 2001), which heart puncture in EDTA-coated tubes, mice were perfused underlies the substantial homology in DNA-binding with ice-cold PBS for 5 min and metabolic organs (i.e. domain and hormone-response elements. For example gonadal WAT, liver, interscapular BAT) were collected for in cancer, the chromatin-binding landscape of the GR molecular, functional and histological analyses. is exceptionally similar to that of other nuclear steroid To evaluate the effect of Enzalutamide alone, we receptors (Severson et al. 2018), GR shares numerous performed a control experiment in which mice were DNA-binding sites with the AR (Arora et al. 2013), and treated with vehicle (N = 6) or Enzalutamide (40 mg/kg/day these two receptors may even form heterodimers on via diet; N = 6) for 27 days. At baseline and after 27 days, glucocorticoid response elements (Chen et al. 1997). body weight was measured with a scale and body https://joe.bioscientifica.com © 2019 Society for Endocrinology https://doi.org/10.1530/JOE-18-0503 Published by Bioscientifica Ltd. Printed in Great Britain Downloaded from Bioscientifica.com at 09/29/2021 02:44:42PM via free access Research Journal of D C E Spaanderman et al. Androgens modulate metabolic 240:1 53 Endocrinology GR activity composition was determined by echo-MRI. Blood was 7:2 MeOH:H2O and ethyl acetate and were enriched with collected at day 21 after a 6 h fast, for analysis of plasma internal standards epicorticosterone and D4-cortisol. The triglycerides, cholesterol and free fatty acids. After 27 days, liver homogenates were dried down under nitrogen and mice were killed by CO2 inhalation, perfused with ice- dissolved in 30% MeOH. The WAT homogenates
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