Unknown,Transcriptomics,Genomics,Proteomics

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EBF2 determines and maintains brown adipocyte identity

ABSTRACT: We compared PPARg binding sites in BAT and eWAT to identify regulatory elements that contribute to BAT identity and to find an important factor that bind those elements. To this end, we performed PPARg ChIP-seq in both tissues and called each tissue-spsecific binding sites. PPARg ChIP-seq in BAT and eWAT of mice

ORGANISM(S): Mus musculus

SUBMITTER: Hee-Woong Lim

PROVIDER: E-GEOD-43763 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:We show that roscovitine; a cyclin-dependent kinases inhibitor; given to mice during the last six weeks of a 19-week high fat diet, reduced weight gain and prevented accompanying insulin resistance, hepatic steatosis, visceral adipose tissue (eWAT) inflammation and fibrosis. It also restored insulin secretion and enhanced whole body energy expenditure. Proteomics and phosphoproteomics analysis of eWAT demonstrated that Roscovitine induced a limited set of proteins associated with lipid metabolism, fatty acid oxidation metabolism and adipose tissue remodeling but suppressed expression of a larger array of peptides and phosphopeptides linked to inflammation and extracellular matrix proteins. Furthermore, the phosphoproteome analysis identified 17 putative protein kinases perturbed by roscovitine, including CMGC kinases [e.g., CDKs and MAPKs], AGC kinases [e.g., S6K and PKC isoforms], and CAMK kinases [e.g., SIK1 and SIK2]). Pathway enrichment analysis of annotated kinase-substrate pairs showed that lipid metabolism, TCA cycle, fatty acid beta oxidation and phosphatidylcholine and creatine biosynthesis are enriched following roscovitine treatment. The increased creatine pathways combined with more active mitochondria in eWAT may contribute to roscovitine-induced weight loss. Surprisingly, we found that unlike for eWAT, roscovitine led to up regulation of large sets of proteins and phosphosites in brown adipose tissue (BAT). Analysis of upstream kinases controlling the phosphoproteome revealed two major kinase groups (AGC kinases [e.g., PKD1 and PKA] and CMGC kinases [e.g., CDKs and MAPKs]. Among the top enriched pathways of kinase-substrate pairs were insulin signaling, regulation of lipolysis in adipocytes, thyroid hormone signaling, thermogenesis and cAMP-PKG signaling, suggesting that roscovitine led to a metabolically more active BAT. Overall, roscovitine treatment led to restoration of mitochondrial activity in BAT and eWAT suppressed by HFD, likely accounting for enhanced energy expenditure and weight loss.

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EBF2 determines and maintains brown adipocyte identity

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