Unknown,Transcriptomics,Genomics,Proteomics

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A methyltransferase EHMT1 controls brown adipose cell fate and adaptive thermogenesis through a PRDM16 complex

ABSTRACT: Brown adipose tissue (BAT) dissipates chemical energy in the form of heat, as a defense against hypothermia and obesity. Current evidence indicates that brown adipocytes arise from Myf5+-dermotomal precursors through the action of a PRDM16-C/EBP-_ transcriptional complex; however, the underlying mechanisms that determine lineage specification and maintenance of brown adipose cells remain poorly understood. Here we study the role of euchromatic histone-lysine N-methyltransferase 1 (EHMT1), a brown fat-enriched lysine methyltransferase, as an essential enzymatic component of the PRDM16 transcriptional complex and controls brown adipose cell fate. To identify targets and function of EHMT1, we performed genome-wide gene expression profiling of BAT from control mouce (Ehmt1flox/flox), Ehmt1Myf5 KO mouse (Myf5-Cre+/-; Ehmt1flox/flox) and Ehmt1adipo KO mouse (Adipo-Cre+/-; Ehmt1flox/flox). Loss of EHMT1 in Myf5+ lineage causes a near total loss of brown fat characteristics and induces muscle-selective gene program in vivo. In addition, adipose-specific deletion of EHMT1 by Adipo-Cre leads to a marked reduction of the thermogenic and fat oxidation genes.

INSTRUMENT(S): Illumina HiSeq 2500

ORGANISM(S): Mus musculus

SUBMITTER: Kosaku Shinoda

PROVIDER: E-MTAB-1704 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Brown adipose tissue (BAT) is a thermogenic organ that dissipates stored energy as heat to maintain body temperature in infants and small mammals. This process may also provide protection from development of diet-induced obesity. We found that the bioactive lipid mediator lysophosphatidic acid (LPA) markedly decreases differentiation of cultured primary brown adipocyte precursors, while potent selective inhibitors of the LPA-generating enzyme autotaxin (ATX) promote differentiation. Transgenic mice overexpressing ATX exhibited reduced expression of BAT-related genes in peripheral white adipose tissue and accumulated significantly more fat than wild-type controls when fed a high fat diet. Our results indicate that ATX and its product LPA are physiologically relevant negative regulators of brown fat adipogenesis and suggest that a decrease in peripheral brown adipose tissue results in increased susceptibility to diet-induced obesity in mice. Primary BAT cell cultures were established as previously reported with some minor modifications (Cannon B., 2001; NÃ©chad M., 1983). Four- to 6-week-old mice were euthanized under aseptic conditions and interscapular BAT (IBAT) dissected, finely minced in digestion buffer containing 123 mM NaCl, 5mM HCl, 1.3 mM CaCl2, 5mM glucose, 1.5% (w/v) crude bovine serum albumin fraction V, 100 mM HEPES, 0.2% collagenase type II (Sigma-Aldrich Corp., St. Louis, MO), pH 7.4, and digested in 10 ml of the same buffer for 30 min at 37Â°C. The supernatant obtained was then filtered using a 250 Âµm nylon mesh and kept in ice for 15 minutes to allow fat droplets and mature cells to float. The resulting infranatant was filtered through a 30 Âµm nylon mesh to enrich the fraction with precursor cells and centrifuged at 700g for 10 min. The pellet obtained was washed once in warm DMEM and resuspended in DMEM medium containing 10% newborn calf serum, 10 mM HEPES, 4mM glutamine, 25 Âµg/ml sodium ascorbate (Sigma-Aldrich Corp., St. Louis, MO)., 100U/ml penicillin and 100mg/ml streptomycin. Cells were seeded onto 35mm dish plates. Insulin treatment was started on day 1 at 50 nM and the concentration increased to 100 nM at day 5 and 200 nM at day 7. Differentiated/confluent cells were collected for biochemical analysis (~day 9). To identify genes regulated by ATX and LPA signaling, 9 DIV primary BAT cultures were treated with the vehicle (DMSO), specific ATX inhibitor HA155 (2.5ÂµM), or LPA (1-Oleoly-LPA, 5ÂµM) (Avanti Polar Lipids, AL, USA) during differentiation. Treatment of the BAT cultures did not affect confluence or markers of proliferation. RNA was extracted from three cultures per condition using TRIzol reagent (Invitrogen, Carlsbad, CA) as described previously (Blalock EM., 2003).

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A methyltransferase EHMT1 controls brown adipose cell fate and adaptive thermogenesis through a PRDM16 complex

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