scholarly journals The PVH as a Site of CB1-Mediated Stimulation of Thermogenesis by MC4R Agonism in Male Rats

Endocrinology ◽  
2014 ◽  
Vol 155 (9) ◽  
pp. 3448-3458 ◽  
Author(s):  
Boris Monge-Roffarello ◽  
Sebastien M. Labbe ◽  
Marie-Claude Roy ◽  
Marie-Laurence Lemay ◽  
Estelle Coneggo ◽  
...  
Keyword(s):  
Uncoupling Protein ◽  
Third Ventricle ◽  
Male Rats ◽  
Whole Body ◽  
Hypothalamic Nucleus ◽  
Peroxisome Proliferator ◽  
Iodothyronine Deiodinase ◽  
Brown Adipose ◽  
Series Of Experiments ◽  
The Brain

Abstract The present study was designed to investigate the involvement of the cannabinoid receptor 1 (CB1) in the stimulating effects of the melanocortin-4 receptor (MC4R) agonism on whole-body and brown adipose tissue (BAT) thermogenesis. In a first series of experiments, whole-body and BAT thermogenesis were investigated in rats infused in the third ventricle of the brain with the MC4R agonist melanotan II (MTII) and the CB1 agonist δ9-tetrahydrocannabinol (δ9-THC) or the CB1 antagonist AM251. Whole-body thermogenesis was measured by indirect calorimetry and BAT thermogenesis assessed from interscapular BAT (iBAT) temperature. δ9-THC blunted the effects of MTII on energy expenditure and iBAT temperature, whereas AM251 tended to potentiate the MTII effects. δ9-THC also blocked the stimulating effect of MTII on 14C-bromopalmitate and 3H-deoxyglucose uptakes in iBAT. Additionally, δ9-THC attenuated the stimulating effect of MTII on the expression of peroxisome proliferator-activated receptor-γ coactivator 1-α (Pgc1α), type II iodothyronine deiodinase (Dio2), carnitine palmitoyltransferase 1B (Cpt1b), and uncoupling protein 1 (Ucp1). In a second series of experiments, we addressed the involvement of the paraventricular hypothalamic nucleus (PVH) in the CB1-mediated effects of MTII on iBAT thermogenesis, which were assessed following the infusion of MTII in the PVH and δ9-THC or AM251 in the fourth ventricle of the brain. We demonstrated the ability of δ9-THC to blunt MTII-induced iBAT temperature elevation. δ9-THC also blocked the PVH effect of MTII on 14C-bromopalmitate uptake as well as on Pgc1α and Dio2 expression in iBAT. Altogether the results of this study demonstrate the involvement of the PVH in the CB1-mediated stimulating effects of the MC4R agonist MTII on whole-body and BAT thermogenesis.

The medial preoptic nucleus as a site of the thermogenic and metabolic actions of melanotan II in male rats

2014 ◽  
Vol 307 (2) ◽  
pp. R158-R166 ◽  
Author(s):  
Boris Monge-Roffarello ◽  
Sebastien M. Labbe ◽  
Christophe Lenglos ◽  
Alexandre Caron ◽  
Damien Lanfray ◽  
...  
Keyword(s):  
Metabolic Effects ◽  
Male Rats ◽  
Hypothalamic Nucleus ◽  
Preoptic Nucleus ◽  
Iodothyronine Deiodinase ◽  
Interscapular Brown Adipose Tissue ◽  
Medial Preoptic Nucleus ◽  
Brown Adipose ◽  
A Site ◽  
Melanotan Ii

The present study was designed to investigate the role of the medial preoptic nucleus (MPO) as a site of the thermogenic and metabolic effects of the α-melanocyte-stimulating hormone analog melanotan II (MTII). We also assessed the involvement of the dorsomedial hypothalamic nucleus (DMH) by investigating the effects of the MPO infusion of MTII in rats with DMH lesions produced by kainic acid. Infusion of MTII in the MPO led to increases in interscapular brown adipose tissue (iBAT) temperature and iBAT uptake of 14C-bromopalmitate. Both increases were blocked by DMH lesions. iBAT temperature increase (area under curve) and 14C-bromopalmitate uptake emerged as two correlated variables ( r = 0.63, P < 0.001). DMH lesions also blocked MTII-induced expression of mRNAs coding for proteins involved in 1) thermogenesis [type II iodothyronine deiodinase ( Dio2) and peroxisome proliferator-activated receptor gamma coactivator 1-α ( Pgc1α)], 2) lipolysis [hormone-sensitive lipase ( Hsl)], and 3) lipogenesis [diacylglycerol-O-acyltransferase 2 ( Dgat2), fatty acid synthase ( Fas)], in iBAT of rats killed 1 h after MPO infusion of MTII. MTII also stimulated expression of genes in iWAT but only in rats with DMH lesions. These genes included glucose transporter member 4 ( Glut4), glycerol-3-phosphate acyltransferase 3 ( Gpat3), Dgat1, Dgat2, triglyceride lipase ( Atgl), Hsl, and carnitine palmitoyltransferase 1β ( Cpt1β). Altogether, the present results reveal the MPO as a site of the thermogenic and metabolic actions of MTII. They also contribute to establish the MPO-DMH duet as a significant target for melanocortins to modulate energy homeostasis.

Selenium and iodine deficiencies: effects on brain and brown adipose tissue selenoenzyme activity and expression

1997 ◽  
Vol 155 (2) ◽  
pp. 255-263 ◽  
Author(s):  
JH Mitchell ◽  
F Nicol ◽  
GJ Beckett ◽  
Keyword(s):  
Adipose Tissue ◽  
Thyroid Hormone ◽  
Glutathione Peroxidase ◽  
Brown Adipose Tissue ◽  
Iodine Deficiency ◽  
Uncoupling Protein ◽  
Compensatory Mechanisms ◽  
Iodothyronine Deiodinase ◽  
Brown Adipose ◽  
The Brain

Adequate dietary iodine supplies and thyroid hormones are needed for the development of the central nervous system (CNS) and brown adipose tissue (BAT) function. Decreases in plasma thyroxine (T4) concentrations may increase the requirement for the selenoenzymes types I and II iodothyronine deiodinase (ID-I and ID-II) in the brain and ID-II in BAT to protect against any fall in intracellular 3,3',5 tri-iodothyronine (T3) concentrations in these organs. We have therefore investigated selenoenzyme activity and expression and some developmental markers in brain and BAT of second generation selenium- and iodine-deficient rats. Despite substantial alterations in plasma thyroid hormone concentrations and thyroidal and hepatic selenoprotein expression in selenium and iodine deficiencies, ID-I, cytosolic glutathione peroxidase (cGSHPx) and phospholipid hydroperoxide glutathione peroxidase (phGSHPx) activities and expression remained relatively constant in most brain regions studied. Additionally, brain and pituitary ID-II activities were increased in iodine deficiency regardless of selenium status. This can help maintain tissue T3 concentrations in hypothyroidism. Consistent with this, no significant effects of iodine or selenium deficiency on the development of the brain were observed, as assessed by the activities of marker enzymes. In contrast, BAT from selenium- and iodine deficient rats had impaired thyroid hormone metabolism and less uncoupling protein than in tissue from selenium- and iodine-supplemented animals. Thus, the effects of selenium and iodine deficiency on the brain are limited due to the activation of the compensatory mechanisms but these mechanisms are less effective in BAT.

scholarly journals Adaptive Thermogenesis in a Mouse Model Lacking Selenoprotein Biosynthesis in Brown Adipocytes

2021 ◽  
Vol 22 (2) ◽  
pp. 611
Author(s):  
Lucia A. Seale ◽  
Ashley N. Ogawa-Wong ◽  
Ligia M. Watanabe ◽  
Vedbar S. Khadka ◽  
Mark Menor ◽  
...  
Keyword(s):  
Thyroid Hormone ◽  
Mouse Model ◽  
Stop Codon ◽  
Uncoupling Protein ◽  
Whole Body ◽  
Iodothyronine Deiodinase ◽  
Brown Adipocytes ◽  
Targeted Deletion ◽  
Adaptive Thermogenesis ◽  
Brown Adipose

Selenoproteins are a class of proteins with the selenium-containing amino acid selenocysteine (Sec) in their primary structure. Sec is incorporated into selenoproteins via recoding of the stop codon UGA, with specific cis and trans factors required during translation to avoid UGA recognition as a stop codon, including a Sec-specific tRNA, tRNA[Ser]Sec, encoded in mice by the gene Trsp. Whole-body deletion of Trsp in mouse is embryonically lethal, while targeted deletion of Trsp in mice has been used to understand the role of selenoproteins in the health and physiology of various tissues. We developed a mouse model with the targeted deletion of Trsp in brown adipocytes (Trspf/f-Ucp1-Cre+/−), a cell type predominant in brown adipose tissue (BAT) controlling energy expenditure via activation of adaptive thermogenesis, mostly using uncoupling protein 1 (Ucp1). At room temperature, Trspf/f-Ucp1-Cre+/− mice maintain oxygen consumption and Ucp1 expression, with male Trspf/f-Ucp1-Cre+/− mice accumulating more triglycerides in BAT than both female Trspf/f-Ucp1-Cre+/− mice or Trspf/f controls. Acute cold exposure neither reduced core body temperature nor changed the expression of selenoprotein iodothyronine deiodinase type II (Dio2), a marker of adaptive thermogenesis, in Trspf/f-Ucp1-Cre+/− mice. Microarray analysis of BAT from Trspf/f-Ucp1-Cre+/− mice revealed glutathione S-transferase alpha 3 (Gsta3) and ELMO domain containing 2 (Elmod2) as the transcripts most affected by the loss of Trsp. Male Trspf/f-Ucp1-Cre+/− mice showed mild hypothyroidism while downregulating thyroid hormone-responsive genes Thrsp and Tshr in their BATs. In summary, modest changes in the BAT of Trspf/f-Ucp1-Cre +/− mice implicate a mild thyroid hormone dysfunction in brown adipocytes.

Adipocyte differentiation of 3T3-L1 preadipocytes is dependent on lipoxygenase activity during the initial stages of the differentiation process

2003 ◽  
Vol 375 (3) ◽  
pp. 539-549 ◽  
Author(s):  
Lise MADSEN ◽  
Rasmus K. PETERSEN ◽  
Morten B. SØRENSEN ◽  
Claus JØRGENSEN ◽  
Philip HALLENBORG ◽  
...  
Keyword(s):  
Adipocyte Differentiation ◽  
Critical Evaluation ◽  
Nordihydroguaiaretic Acid ◽  
Whole Body ◽  
Transcriptional Networks ◽  
Peroxisome Proliferator ◽  
The Novel ◽  
Differentiation Process ◽  
Peroxisome Proliferator Activated Receptor ◽  
Brown Adipose

Adipocytes play a central role in whole-body energy homoeostasis. Complex regulatory transcriptional networks control adipogensis, with ligand-dependent activation of PPARγ (peroxisome proliferator-activated receptor γ) being a decisive factor. Yet the identity of endogenous ligands promoting adipocyte differentiation has not been established. Here we present a critical evaluation of the role of LOXs (lipoxygenases) during adipocyte differentiation of 3T3-L1 cells. We show that adipocyte differentiation of 3T3-L1 preadipocytes is inhibited by the general LOX inhibitor NDGA (nordihydroguaiaretic acid) and the 12/15-LOX selective inhibitor baicalein. Baicalein-mediated inhibition of adipocyte differentiation was rescued by administration of rosiglitazone. Treatment with baicalein during the first 4 days of the differentiation process prevented adipocyte differentiation; supplementation with rosiglitazone during the same period was sufficient to rescue adipogenesis. Accordingly, we demonstrate that adipogenic conversion of 3T3-L1 cells requires PPARγ ligands only during the first 4 days of the differentiation process. We show that the baicalein-sensitive synthesis of endogenous PPARγ ligand(s) increases rapidly upon induction of differentiation and reaches a maximum on days 3–4 of the adipocyte differentiation programme. The conventional platelet- and leucocyte-type 12(S)-LOXs and the novel eLOX-3 (epidermis-type LOX-3) are expressed in white and brown adipose tissue, whereas only eLOX-3 is clearly expressed in 3T3-L1 cells. We suggest that endogenous PPARγ ligand(s) promoting adipocyte differentiation are generated via a baicalein-sensitive pathway involving the novel eLOX-3.

scholarly journals Reverse Feeding Suppresses the Activity of the GH Axis in Rats and Induces a Preobesogenic State

Endocrinology ◽  
2011 ◽  
Vol 152 (3) ◽  
pp. 869-882 ◽  
Author(s):  
Camilla A.-M. Glad ◽  
Edward E. J. Kitchen ◽  
Gemma C. Russ ◽  
Sophie M. Harris ◽  
Jeffrey S. Davies ◽  
...  
Keyword(s):  
Mrna Expression ◽  
Phase Inversion ◽  
Fatty Acid Synthase ◽  
Uncoupling Protein ◽  
Expression Patterns ◽  
Pulse Height ◽  
Male Rats ◽  
Dark Phase ◽  
Peroxisome Proliferator ◽  
Gh Secretion

Reversed feeding (RF) is known to disrupt hormone rhythmicity and metabolism. Although these effects may be mediated in part by phase inversion of glucocorticoid secretion, the precise mechanism is incompletely characterized. In this study, we demonstrate that acute nocturnal food deprivation in male rats suppressed the amplitude of spontaneous GH secretion during the dark phase by 62% (P &lt; 0.001), without affecting baseline secretion. Prolonged RF, which reduced pituitary weight (by 22%; P &lt; 0.05), also suppressed GH pulse height sufficiently to reduce skeletal growth (by 4–5%; P &lt; 0.01) and terminal liver weight (by 11%; P &lt; 0.001). Despite this suppression of the GH axis, proportionate adiposity was not elevated, probably due to the accompanying 16% reduction in cumulative food intake (P &lt; 0.01). We demonstrate that RF also resulted in phase inversion of core clock gene expression in liver, abdominal white adipose tissue (WAT) and skeletal muscle, without affecting their expression patterns in the suprachiasmatic nucleus. In addition, RF resulted in phase inversion of hepatic peroxisome proliferator-activated receptor γ2 mRNA expression, a 3- to 5-fold elevation in fatty acid synthase mRNA in WAT in both light- and dark-phase samples (P &lt; 0.01) and an elevation in muscle uncoupling protein 3 mRNA expression at the beginning of the light phase (P &lt; 0.01). Consumption of a high-fat diet increased inguinal (by 36%; P &lt; 0.05) and retroperitoneal WAT weight (by 72%; P &lt; 0.01) only in RF-maintained rats, doubling the efficiency of lipid accumulation (P &lt; 0.05). Thus, RF not only desynchronizes central and peripheral circadian clocks, and suppresses nocturnal GH secretion, but induces a preobesogenic state.

KCTD10 regulates brown adipose tissue thermogenesis and metabolic function via Notch Signaling

2021 ◽  
Author(s):  
Mingsheng Ye ◽  
Liping Luo ◽  
Qi Guo ◽  
Guanghua Lei ◽  
Chao Zeng ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Notch Signaling ◽  
Molecular Mechanisms ◽  
Uncoupling Protein ◽  
Notch Signaling Pathway ◽  
Whole Body ◽  
Brown Adipocyte ◽  
Metabolic Function ◽  
Brown Adipose

Brown adipose tissue (BAT) is emerging as a target to beat obesity through the dissipation of chemical energy to heat. However, the molecular mechanisms of brown adipocyte thermogenesis remain to be further elucidated. Here, we show that KCTD10, a member of the polymerase delta-interacting protein 1 (PDIP1) family, was reduced in BAT by cold stress and a β3 adrenoceptor agonist. Moreover, KCTD10 level increased in the BAT of obese mice, and KCTD10 overexpression attenuates uncoupling protein 1 (UCP1) expression in primary brown adipocytes. BAT-specific KCTD10 knockdown mice had increased thermogenesis and cold tolerance protecting from high fat diet (HFD)-induced obesity. Conversely, overexpression of KCTD10 in BAT caused reduced thermogenesis, cold intolerance, and obesity. Mechanistically, inhibiting Notch signaling restored the KCTD10 overexpression suppressed thermogenesis. Our study presents that KCTD10 serves as an upstream regulator of notch signaling pathway to regulate BAT thermogenesis and whole-body metabolic function.

scholarly journals Brown adipose tissue activity is modulated in olanzapine-treated young rats by simvastatin

2020 ◽  
Author(s):  
Xuemei Liu ◽  
Xiyu Feng ◽  
Chao Deng ◽  
Lu Liu ◽  
Yanping Zeng ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Weight Gain ◽  
Food Intake ◽  
Brown Adipose Tissue ◽  
Body Weight Gain ◽  
Uncoupling Protein ◽  
Peroxisome Proliferator ◽  
Sprague Dawley ◽  
Olanzapine Treatment ◽  
Brown Adipose

Abstract BackgroundPrescription of second-generation antipsychotic drugs (SGAs) to childhood/adolescent has exponentially increased in recent years, which was associated with the greater risk of significant sedation, weight gain, and dyslipidemia. Statin is considered a potential preventive and treatment approach for reducing SGA-induced weight gain and dyslipidemia in schizophrenia patients. However, the effect of statin treatment in children and adolescents with SGA-induced dyslipidemia is not clearly demonstrated.MethodsTo investigate the efficacy of interventions of statin aimed at reversing SGA-induced dyslipidemia, young Sprague Dawley (SD) rats were treated orally with either olanzapine (1.0 mg/kg, t.i.d.), simvastatin (3.0 mg/kg, t.i.d.), olanzapine plus simvastatin (O+S), or vehicle (control) for 5 weeks.ResultsOlanzapine treatment increased weight gain, food intake and feeding efficiency compared to the control, while O+S co-treatment significantly reversed body weight gain but had no significant effect on food intake. Moreover, olanzapine treatment induced a slight but significant reduction in body temperature, with a decrease in locomotor activity. Fasting plasma glucose, triglycerides (TG), and total cholesterol (TC) levels were markedly elevated in the olanzapine-only group, whereas O+S co-treatment significantly ameliorated these changes. A down-regulating of uncoupling protein-1 (UCP1) and peroxisome-proliferator-activated receptor-γ co-activator-1α (PGC-1α) expression was observed in brown adipose tissue (BAT) in the olanzapine-only group, following a significant decrease in the ratio of phosphorylated PKA (p-PKA)/PKA. Interestingly, these protein changes could be reversed by co-treatment with O+B. Our results demonstrated simvastatin to be effective in ameliorating TC and TG elevated by olanzapine.ConclusionsModulation of BAT activity could be a partial mechanism in reducing metabolic side effects caused by SGAs in child and adolescent patients.

scholarly journals Brown adipose tissue activity is modulated in olanzapine-treated young rats by simvastatin

2020 ◽  
Author(s):  
Xuemei Liu ◽  
Xiyu Feng ◽  
Chao Deng ◽  
Lu Liu ◽  
Yanping Zeng ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Weight Gain ◽  
Food Intake ◽  
Brown Adipose Tissue ◽  
Body Weight Gain ◽  
Uncoupling Protein ◽  
Peroxisome Proliferator ◽  
Sprague Dawley ◽  
Olanzapine Treatment ◽  
Brown Adipose

Abstract Background Prescription of second-generation antipsychotic drugs (SGAs) to childhood/adolescent has exponentially increased in recent years, which was associated with the greater risk of significant weight gain and dyslipidemia. Statin is considered a potential preventive and treatment approach for reducing SGA-induced weight gain and dyslipidemia in schizophrenia patients. However, the effect of statin treatment in children and adolescents with SGA-induced dyslipidemia is not clearly demonstrated.Methods To investigate the efficacy of statin interventions for reversing SGA-induced dyslipidemia, young Sprague Dawley rats were treated orally with either olanzapine (1.0 mg/kg, t.i.d.), simvastatin (3.0 mg/kg, t.i.d.), olanzapine plus simvastatin (O+S), or vehicle (control) for 5 weeks. Results Olanzapine treatment increased weight gain, food intake and feeding efficiency compared to the control, while O+S co-treatment significantly reversed body weight gain but without significant effects on food intake. Moreover, olanzapine treatment induced a slight but significant reduction in body temperature, with a decrease in locomotor activity. Fasting plasma glucose, triglycerides (TG), and total cholesterol (TC) levels were markedly elevated in the olanzapine-only group, whereas O+S co-treatment significantly ameliorated these changes. Pronounced activation of lipogenic gene expression in the liver and down-regulated expression of uncoupling protein-1 (UCP1) and peroxisome-proliferator-activated receptor-γ co-activator-1α (PGC-1α) in brown adipose tissue (BAT) was observed in the olanzapine-only group. Interestingly, these protein changes could be reversed by co-treatment with O+B. Conclusions Simvastatin is effective in ameliorating TC and TG elevated by olanzapine. Modulation of BAT activity by statins could be a partial mechanism in reducing metabolic side effects caused by SGAs in child and adolescent patients.

trans-10, cis-12, but not cis-9,trans-11 CLA isomer, inhibits brown adipocyte thermogenic capacity

2002 ◽  
Vol 282 (6) ◽  
pp. R1789-R1797 ◽  
Author(s):  
Enrique Rodrı́guez ◽  
Joan Ribot ◽  
Andreu Palou
Keyword(s):  
Linoleic Acid ◽  
Uncoupling Protein ◽  
Brown Adipocyte ◽  
Peroxisome Proliferator ◽  
Mrna Levels ◽  
Equal Concentration ◽  
Brown Adipose ◽  
Cla Isomers ◽  
Thermogenic Capacity

Conjugated linoleic acid (CLA) is reported to have health benefits, including reduction of body fat. Previous studies have shown that brown adipose tissue (BAT) is particularly sensitive to CLA-supplemented diet feeding. Most of them use mixtures containing several CLA isomers, mainly cis-9, trans-11 and trans-10, cis-12 in equal concentration. Our aim was to characterize the separate effects of both CLA isomers on thermogenic capacity in cultured brown adipocytes. The CLA isomers showed opposite effects. Hence, on the one hand, trans-10, cis-12 inhibited uncoupling protein (UCP) 1 induction by norepinephrine (NE) and produced a decrease in leptin mRNA levels. These effects were associated with a blockage of CCAAT-enhancer-binding protein-α and peroxisome proliferator-activated receptor-γ2 mRNA expression. On the other hand, cis-9, trans-11 enhanced the UCP1 elicited by NE, an effect reported earlier for polyunsaturated fatty acids and also observed here for linoleic acid. These findings could explain, at least in part, the effects observed in vivo when feeding a CLA mixture supplemented diet as a result of the combined action of CLA isomers (reduction of adipogenesis and defective BAT thermogenesis that could be through trans-10, cis-12 and enhanced UCP1 thermogenic capacity through cis-9, trans-11).

scholarly journals Bone marrow adipose tissue does not express UCP1 during development or adrenergic-induced remodeling

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Clarissa S. Craft ◽  
Hero Robles ◽  
Madelyn R. Lorenz ◽  
Eric D. Hilker ◽  
Kristann L. Magee ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Adipose Tissue ◽  
Uncoupling Protein ◽  
Enrichment Analysis ◽  
Whole Body ◽  
Mineral Density ◽  
Bone Marrow Adipose Tissue ◽  
Marrow Adipose Tissue ◽  
Reporter Mice ◽  
Brown Adipose

AbstractAdipocytes within the skeleton are collectively termed bone marrow adipose tissue (BMAT). BMAT contributes to peripheral and local metabolism, however, its capacity for cell-autonomous expression of uncoupling protein 1 (UCP1), a biomarker of beige and brown adipogenesis, remains unclear. To overcome this, Ucp1-Cre was used to drive diphtheria toxin expression in cells expressing UCP1 (Ucp1Cre+/DTA+). Despite loss of brown adipose tissue, BMAT volume was not reduced in Ucp1Cre+/DTA+ mice. Comparably, in mTmG reporter mice (Ucp1Cre+/mTmG+), Ucp1-Cre expression was absent from BMAT in young (3-weeks) and mature (16-weeks) male and female mice. Further, β3-agonist stimulation failed to induce Ucp1-Cre expression in BMAT. This demonstrates that BMAT adipocytes are not UCP1-expressing beige/brown adipocytes. Thus, to identify novel and emerging roles for BMAT adipocytes in skeletal and whole-body homeostasis, we performed gene enrichment analysis of microarray data from adipose tissues of adult rabbits. Pathway analysis revealed genetic evidence for differences in BMAT including insulin resistance, decreased fatty acid metabolism, and enhanced contributions to local processes including bone mineral density through candidate genes such as osteopontin. In sum, this supports a paradigm by which BMAT adipocytes are a unique subpopulation that is specialized to support cells within the skeletal and hematopoietic niche.

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