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Nantong Key Laboratory of Translational Medicine in Cardiothoracic Diseases, Institute of Translational Medicine in Cardiothoracic Diseases, Affiliated Hospital of Nantong University, Nantong, China
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cells are activated to express UCP1, promoting energy expenditure and heat production. This process is called white fat browning ( Carneheim et al. 1984 , Au-Yong 2009 , Chartoumpekis et al. 2011 , Nedergaard & Cannon 2014 ). Several studies have
School of Medicine, Mater Research Institute, The Translational Research Institute, Princess Alexandra Hospital, University of Queensland, Herston, Queensland, Australia
School of Medicine, Mater Research Institute, The Translational Research Institute, Princess Alexandra Hospital, University of Queensland, Herston, Queensland, Australia
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School of Medicine, Mater Research Institute, The Translational Research Institute, Princess Alexandra Hospital, University of Queensland, Herston, Queensland, Australia
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School of Medicine, Mater Research Institute, The Translational Research Institute, Princess Alexandra Hospital, University of Queensland, Herston, Queensland, Australia
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School of Medicine, Mater Research Institute, The Translational Research Institute, Princess Alexandra Hospital, University of Queensland, Herston, Queensland, Australia
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School of Medicine, Mater Research Institute, The Translational Research Institute, Princess Alexandra Hospital, University of Queensland, Herston, Queensland, Australia
School of Medicine, Mater Research Institute, The Translational Research Institute, Princess Alexandra Hospital, University of Queensland, Herston, Queensland, Australia
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Introduction Brown adipose tissue (BAT) plays an important role in thermoregulation and energy balance in rodents. Thermogenesis in BAT is achieved by uncoupling protein 1 (UCP1), which dissociates ATP synthesis from the mitochondrial
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; and local glucocorticoid action, as determined by the abundance of glucocorticoid receptor (GR) and isoforms of 11 β-hydroxysteroid dehydrogenase (11βHSD). The locations and postulated roles of UCP2, VDAC and cytochrome c are outlined in Fig. 1
Department of Physiology, Naval Medical University, Shanghai, China
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NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin, China
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patients with T2D ( Yoneshiro et al . 2013 , Hanssen et al . 2015 ). BAT generates heat by an adaptive process called non-shivering thermogenesis (NST), which is mediated by uncoupling protein 1 (UCP1) ( Porter et al . 2016 ). Upon acute cold
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Internal Medicine-Division of Gastroenterology and Hepatology, University of Missouri System, Columbia, Missouri, USA
Research Service, Truman VA Memorial Hospital, Columbia, Missouri, USA
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Dalton Cardiovascular Research Center, University of Missouri System System, Columbia, Missouri, USA
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question. Pharmacological activation of ERb has been shown to increase adipocyte mitochondrial function in mice and significantly upregulate uncoupling protein 1 (UCP1), the signature protein in beige and BAT ( Ponnusamy et al. 2017 ). Interestingly, in
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Early Life Nutrition Research Unit, Respiratory Biomedical Research Unit, Department of Animal Sciences, Division of Human Development, Academic Child Health
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Early Life Nutrition Research Unit, Respiratory Biomedical Research Unit, Department of Animal Sciences, Division of Human Development, Academic Child Health
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HUGO Database) and the enzymes 11β-hydroxysteroid dehydrogenase (HSD11B) types 1 and 2 as well as uncoupling protein 2 (UCP2) and peroxisome proliferator-activated receptor γ (PPARG; Whorwood et al . 2001 , Bispham et al . 2005 , Gnanalingham et
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(BAT), on the other hand, is a key site of energy expenditure via heat production (thermogenesis). The brown adipocytes display multilocular lipid droplet structures and express uncoupling protein 1 ( Ucp1 ), which, when activated, short circuits the
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(UCP-1) rather than producing ATP. A lean and healthy phenotype is associated with elevated BAT in animals, suggesting that modulating BAT could be used for protection against obesity. BAT is present at distinct anatomical sites, whereas brown fat cells
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We recently reported that the leptin-induced increase in uncoupling protein 1 (UCP1) mRNA in brown adipose tissue (BAT) is prevented by the denervation of BAT. We also reported that retinoic acid (RA) increases UCP1 mRNA in BAT. To extend these finding to UCP2 and UCP3 in BAT, we examined UCP2 and UCP3 mRNA after unilateral denervation of BAT, as well as after leptin, beta(3)-adrenergic agonist, RA, and glucocorticoid administration to rats. UCP3 mRNA was 20% less in the denervated compared with the intact BAT, whereas UCP2 mRNA was unchanged with denervation. The beta(3)-adrenergic agonist, CGP-12177 (0.75 mg/kg), increased UPC3 mRNA by 40% in the innervated and by 85% in the denervated BAT. Leptin (0.9 mg/day for 3 days) increased both UCP2 and UCP3 mRNA by 30% in the innervated and, surprisingly, in the denervated BAT. RA (7.5 mg/kg) increased UCP1 mRNA but decreased UCP2 and UCP3 mRNA by 50%, whereas methylprednisolone (65 mg/kg, two doses 24 h apart) suppressed all three uncoupling proteins by greater than 60%. The present findings indicate that: sympathetic innervation is necessary to maintain basal levels of UCP3 mRNA; beta(3)-adrenergic agonist stimulation induces UCP3 mRNA; leptin induces UCP2 and UCP3 mRNA and this induction is not dependent on sympathetic innervation; RA increases UCP1 but decreases UCP2 and UCP3 mRNA; and methylprednisolone suppresses UCP1, UCP2, and UCP3 mRNA equally. These data suggest that there are distinct patterns of regulation between UCP1, UCP2, and UCP3, and there may be at least two modes by which leptin could modulate thermogenesis in BAT; first, by increasing sympathetic stimulation of BAT and induction of UCP1 mRNA and, secondly, by increasing UCP2 and UCP3 mRNA by a mechanism independent of sympathetic stimulation.
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the pituitary gland and the in vitro TSH secretion both under basal conditions and after TRH stimulation. Additionally, we studied the uncoupling protein 1 (UCP1) in BAT and the mitochondrial α-glycerol-3-phosphate dehydrogenase (mGPD) activity in