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Bone Marrow Fat Has Brown Adipose Tissue Characteristics, Which Are Attenuated with Aging and Diabetes

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Bone Marrow Fat Has Brown Adipose Tissue Characteristics, Which Are Attenuated with Aging and Diabetes BON-09309; No. of pages: 7; 4C: Bone xxx (2011) xxx–xxx Contents lists available at ScienceDirect Bone journal homepage: www.elsevier.com/locate/bone Bone marrow fat has brown adipose tissue characteristics, which are attenuated with aging and diabetes A. Krings a,1,2, S. Rahman a,2, S. Huang a,3,Y.Lua, P.J. Czernik a, B. Lecka-Czernik a,b,c,⁎ a Department of Orthopaedic Surgery, University of Toledo Health Sciences Campus, Toledo, OH 43614, USA b Department of Physiology and Pharmacology, University of Toledo Health Sciences Campus, Toledo, OH 43614, USA c Center for Diabetes and Endocrine Research, University of Toledo Health Sciences Campus, Toledo, OH 43614, USA article info abstract Article history: Fat occupies a significant portion of bone cavity however its function is largely unknown. Marrow fat expands Received 14 March 2011 during aging and in conditions which affect energy metabolism, indicating that fat in bone is under similar Revised 12 June 2011 regulatory mechanisms as other fat depots. On the other hand, its location may determine specific functions in Accepted 15 June 2011 the maintenance of the environment for bone remodeling and hematopoiesis. We have demonstrated that Available online xxxx marrow fat has a distinctive phenotype, which resembles both, white and brown adipose tissue (WAT and Edited by: Clifford Rosen BAT, respectively). Marrow adipocytes express gene markers of brown adipocytes at levels characteristic for the BAT, including transcription factor Prdm16, and regulators of thermogenesis such as deiodinase 2 (Dio2) Keywords: and PGC1α. The levels of expression of BAT-specific gene markers are decreased in bone of 24 mo old C57BL/6 Bone and in diabetic yellow agouti Avy/a mice implicating functional changes of marrow fat occurring with aging Marrow fat and diabetes. Administration of antidiabetic TZD rosiglitazone, which sensitizes cells to insulin and increases Brown fat adipocyte metabolic functions, significantly increased both, BAT (UCP1, PGC1α, Dio2, β3AR, Prdm16, and White fat FoxC2) and WAT (adiponectin and leptin) gene expression in marrow of normoglycemic C57BL/6 mice, but Adipogenesis failed to increase the expression of BAT, but not WAT, gene markers in diabetic mice. In conclusion, the metabolic phenotype of marrow fat combines both BAT and WAT characteristics. Decrease in BAT-like characteristics with aging and diabetes may contribute to the negative changes in the marrow environment supporting bone remodeling and hematopoiesis. This article is part of a Special Issue entitled Bone and Fat. © 2011 Elsevier Inc. All rights reserved. Introduction still unclear in this process. Two types of fat tissues, white and brown adipose tissue (WAT and BAT, respectively), are relatively well Bone marrow provides an environment for controlling the understood with regards to their metabolic activities. The marrow maintenance of bone homeostasis, which is determined by autocrine, fat or the yellow adipose tissue (YAT) constitutes a third category of paracrine and endocrine activities of different cellular components. fat tissue and its metabolic activity is largely unknown. Amid advances in understanding the complexity of marrow environ- Fat plays an important role in the regulation of energy metabolism. ment and its role in the regulation of bone remodeling process, the It stores and releases energy under conditions of feeding and fasting, role of fat, which is abundant marrow component in the adult bone, is and regulates energy balance in peripheral tissues through its endo- crine activities. Adipocytes accumulate energy in the form of lipids and burn it in the process of fatty acid β-oxidation. Moreover, energy ⁎ Corresponding author at: Dept. Orthopaedic Surgery, Physiology and Pharmacology, balance is established through the production of adipokines, among Center for Diabetes and Endocrine Research, MS 1008, University of Toledo Health them leptin and adiponectin, which regulate calorie intake and insulin Sciences Campus, 3000 Arlington Ave., Toledo, OH 43614, USA. Fax: +1 419 383 2871. sensitivity, respectively. The multiplex of fat functions is sequestered E-mail addresses: [email protected] (A. Krings), throughout different fat depots. Mitochondria-sparse WAT, consti- [email protected] (S. Rahman), [email protected] (S. Huang), [email protected] (Y. Lu), [email protected] (P.J. Czernik), tutes ~10% of body weight in lean humans, and is represented by [email protected] (B. Lecka-Czernik). visceral and subcutaneous fat with a function in energy storage and 1 Current Address: Maastricht University, Faculty of Health, Medicine and Life regulation of insulin sensitivity and glucose metabolism in liver and Science, PO Box 616, 6200 MD Maastricht, The Netherlands. muscle. Mitochondria-enriched BAT, is distributed in adult humans as 2 These authors contributed equally. discrete tissue deposits located in the neck, supraclavicular, para- 3 Current Address: Department of Orthopaedic Surgery, Tongji Hospital and Medical College, Huazhong University of Science & Technology, 1095 Jiefang Avenue, Wuhan, vertebral, and suprarenal regions [40] and is found abundantly in the China. scapulae of rodents. BAT, yielded by transcription factors Prdm16 8756-3282/$ – see front matter © 2011 Elsevier Inc. All rights reserved. doi:10.1016/j.bone.2011.06.016 Please cite this article as: Krings A, et al, Bone marrow fat has brown adipose tissue characteristics, which are attenuated with aging and diabetes, Bone (2011), doi:10.1016/j.bone.2011.06.016 2 A. Krings et al. / Bone xxx (2011) xxx–xxx and FoxC2 and co-activator PGC1α, functions in adaptive thermo- particle (IAP) retrotransposon inserted in noncoding exon 2 of the genesis by dissipating energy in the form of heat [11]. This is mediated agouti locus [7]. In hypothalamic orexigenic neurons, agouti (Ag) by uncoupling protein 1 (UCP1), which stimulates proton leak from protein binds to and represses the activity of MC4R, which regulates the mitochondrial membrane to uncouple respiration from ATP energy metabolism and satiety. Mice with Avy/a phenotype (expres- synthesis to produce heat. BAT thermogenic activity is controlled sing Ag protein) develop obesity, hyperglycemia, hyperinsulinemia by the central nervous system via catecholamines and β-adrenergic and insulin resistance by 8 weeks of age, whereas mice with a/a signaling, and deiodinase 2 (Dio2)-mediated thyroid hormone phenotype (non-expressing Ag protein) are lean, normoglycemic and conversion from thyroxine (T4) to triiodothyronine (T3). Along insulin sensitive [41]. with its role in adaptive thermogenesis, BAT also has a function in Animals were housed with free access to water and were protecting against obesity, insulin resistance and diabetes [5,8,17,18]. maintained at a constant temperature, on a 12 h light–dark cycle. As demonstrated recently, BAT and WAT originate from different The animal treatment and care protocols conformed to NIH Guidelines pools of mesenchymal precursors [32]. In neonates, brown adipocytes and were performed using a UT HSC Institutional Animal Care and originate from precursor cells, which express myogenic factor Utilization Committee (IACUC) protocol. Myf5, and may also differentiate to muscle [32]. On the other hand, For experiments testing rosiglitazone effects on gene expression the transcriptional regulator and tumor suppressor retinoblastoma profile in different fat depots, animals were fed for 4 weeks either diet protein pRb is involved in the lineage allocation of mesenchymal stem supplemented with rosiglitazone maleate (Avandia, GlaxoSmithKline, cells toward osteoblasts, and brown and white adipocytes [4,10]. King of Prussia, PA) at the dose of 20 mg/kg/day or non-supplemented Thus, a presence of pRb in early mesenchymal progenitors directs diet, as described previously [20]. At the end of experiment the their differentiation towards osteoblasts, while an absence of pRb following tissues were collected for RNA isolation: epidydimal fat as a allows for commitment of the same progenitors to brown adipocyte representative of WAT, interscapular fat as a representative of BAT, lineage and their further differentiation under control of Prdm16. and a whole tibia bone as a representative of a tissue containing YAT. More interestingly, re-expression of pRb in cells already committed to Tissues were homogenized in 1 ml of TRIzol (Invitrogen, Carlsbad, CA) brown adipocyte lineage converts them into adipocytes of white and total RNA was extracted according to manufacturer's protocols. phenotype suggesting interconversion between white and brown phenotypes [4,10]. Indeed, BAT-like phenotype can be also induced in Determination of marrow adipocyte number differentiated WAT suggesting a local function within WAT perhaps associated with on demand energy dissipation and not necessarily Tibiae of experimental animals were decalcified in formic acid, thermogenesis [31,33,39]. embedded in paraffin and sectioned at 5 μm. Histological sections YAT, or yellow adipose tissue, bears its name due to a moderate were stained with hematoxylin and eosin. Fat cells identified as number of mitochondria that gives it a yellowish appearance. It empty oval spaces were enumerated under magnification 20× on five originates from the same marrow mesenchymal stem cells which can consecutive microscopic fields of the secondary spongiosa of the differentiate to osteoblasts, and in this respect it resembles WAT proximal tibia as described previously [30] and an average
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