The Histone Methyltransferase SUV420H2 Regulates Brown and Beige Adipocyte Thermogenesis
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ABSTRACT:
PROVIDER: PRJNA1023212 | ENA |
REPOSITORIES: ENA
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Project description:Activation of brown adipose tissue (BAT) thermogenesis increases energy expenditure and alleviates obesity. Epigenetic regulation has emerged as a key mechanism underlying BAT development and function. To study the epigenetic regulation of BAT thermogenesis, we surveyed the expression of epigenetic enzymes that catalyze histone modifications in developmental beige adipocytes and found a unique expression pattern of suppressor of variegation 4-20 homolog 2 (Drosophila) (Suv420h2), a histone methyltransferase that preferentially catalyzes the tri-methylation at histone H4 lysine 20 (H4K20me3), a hallmark of gene silencing. Here we discovered that Suv420h2 expression parallels that of UCP1 expression in brown and beige adipocytes and that SUV420H2 knockdown significantly reduces, whereas SUV420H2 overexpression significantly increases UCP1 levels in brown adipocytes. Suv420h2 knockout (H2KO mice exhibit impaired cold-induced thermogenesis and are prone to diet-induced obesity. In contrast, mice with specific overexpression of Suv420h2 in adipocytes display enhanced cold-induced thermogenesis and are resistant to diet-induced obesity. Further study showed that Suv420h2 catalyzes H4K20 trimethylation at eukaryotic translation initiation factor 4E-binding protein 1 (4E-BP1) promoter, leading to down-regulated expression of 4E-BP1, a negative regulator of the translation initiation complex. This in turn up-regulates PGC1α protein levels, which is associated with increased expression of thermogenic program. We conclude that Suv420h2 is a key regulator of brown/beige adipocyte development and thermogenesis.
2024-05-09 | GSE244457 | GEO
Project description:Activation of brown adipose tissue (BAT) thermogenesis increases energy expenditure and alleviates obesity. Epigenetic regulation has emerged as a key mechanism underlying BAT development and function. To study the epigenetic regulation of BAT thermogenesis, we surveyed the expression of epigenetic enzymes that catalyze histone modifications in developmental beige adipocytes and found a unique expression pattern of suppressor of variegation 4-20 homolog 2 (Drosophila) (Suv420h2), a histone methyltransferase that preferentially catalyzes the tri-methylation at histone H4 lysine 20 (H4K20me3), a hallmark of gene silencing. Here we discovered that Suv420h2 expression parallels that of UCP1 expression in brown and beige adipocytes and that SUV420H2 knockdown significantly reduces, whereas SUV420H2 overexpression significantly increases UCP1 levels in brown adipocytes. Suv420h2 knockout (H2KO mice exhibit impaired cold-induced thermogenesis and are prone to diet-induced obesity. In contrast, mice with specific overexpression of Suv420h2 in adipocytes display enhanced cold-induced thermogenesis and are resistant to diet-induced obesity. Further study showed that Suv420h2 catalyzes H4K20 trimethylation at eukaryotic translation initiation factor 4E-binding protein 1 (4E-BP1) promoter, leading to down-regulated expression of 4E-BP1, a negative regulator of the translation initiation complex. This in turn up-regulates PGC1α protein levels, which is associated with increased expression of thermogenic program. We conclude that Suv420h2 is a key regulator of brown/beige adipocyte development and thermogenesis.
2024-05-09 | GSE245509 | GEO
Project description:The Histone Methyltransferase SUV420H2 Regulates Brown and Beige Adipocyte Thermogenesis (ATAC-Seq)
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Project description:We report that both conventional and adipose-specific Naa10p deletions in mice result in increased energy expenditure, thermogenesis, beige adipocyte differentiation and activation. Mechanistically, Naa10p acetylates the N-terminus of Pgc1-alpha and prevents it from interacting with Ppar[gamma] to activate key genes, such as Ucp1, involved in beige adipocyte function.
2019-08-15 | GSE133726 | GEO
Project description:We reported that both conventional and adipose-specific Naa10p deletions in mice result in increased energy expenditure, thermogenesis, beige adipocyte differentiation and activation. Mechanistically, Naa10p acetylates the N-terminus of Pgc1α and prevents it from interacting with Ppar to activate key genes, such as Ucp1, involved in beige adipocyte function. We used microarrays to profile the gene expression changes by Naa10p KO in inguinal white adipose tissues (iWATs) derived from mice fed with high fat diet for 15 weeks.
2019-08-16 | GSE133865 | GEO
Project description:Naa10p Inhibits Beige Adipocyte-mediated Thermogenesis through N-α-acetylation of Pgc1α
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Project description:Two types of UCP1 positive cells-brown and beige adipocytes exist in mammals. Beige adipocytes are very plastic, and can be dynamically regulated by environment.Beige adipocytes formed postnatally in subcutaneous inguinal white adipose tissue (iWAT) lost thermogenic gene expression and multilocular morphology at adult stage, but cold could restore their “beigeing” characteristics, a phenomenon termed as beige adipocyte renaissance. Our results showed that beige cell maintenance and renaissance in adult mice were regulated by cAMP and HDAC4 signaling in white adipocytes non-cell autonomously. Genetic modulations of various components of this cAMP-HDAC4 cascade (e.g. LKB1) led to persistent browning and reduced adiposity independent of thermogenesis. To further study the mechanisms of beige adipocytes maintenance, we performed RNA-seq with samples from inguinal white adipose tissues of WT, AdipoqCre LKB1 F/F, and AdipoqCre LKB1 F/F; HDAC4 F/F mice.Our studies will move the beige adipocyte field forward and attract clinical applications to target beige adipocyte renaissance.
2018-02-14 | GSE85335 | GEO
Project description:Naa10p Inhibits Beige Adipocyte-mediated Thermogenesis through N-alpha-acetylation of Pgc1-alpha
| PRJNA552345 | ENA
Project description:Adipocytes deficient in fatty acid synthase (iAdFASNKO) emit signals that mimic cold exposure to enhance the appearance of thermogenic beige adipocytes in mouse inguinal white adipose tissues (iWAT). Both cold- and iAdFASNKO-induced iWAT “browning” pathways upregulate the sympathetic nerve fiber (SNF) modulator Nrg4 and activate SNFs adjacent to beige adipocytes. Adipocyte cAMP/protein kinase A signaling is necessary for beige adipocyte appearance, as we show here it is blocked in Gsa deficient cold exposed or iAdFASNKO mice. Surprisingly however, denervation of iWAT failed to block adipocyte browning in iAdFASNKO mice, as it does in cold-exposed mice. Similarly, Nrg4 deficiency markedly reduced iWAT UCP1 in the cold, but not in double FASN/Nrg4 KO mice. Single-cell transcriptomic analysis of iWAT stromal cells revealed increased macrophages displaying gene expression signatures of the alternately activated type in iAdFASNKO mice, and their depletion abrogated iWAT beiging. Altogether, these findings reveal divergent cellular pathways are sufficient to cause adipocyte browning. Importantly, adipocyte signaling to enhance alternatively activated macrophages in iAdFASNKO mice is associated with enhanced adipose thermogenesis independent of the sympathetic neuron involvement this process requires in the cold.
2020-08-18 | GSE154047 | GEO
Project description:In obesity, misalignment of feeding time with the light/dark environment results in disruption of peripheral circadian clocks. Conversely, restricting feeding to the active period mitigates metabolic syndrome through mechanisms that remain unknown. Here we show that adipocyte thermogenesis is essential for the healthful metabolic response to time restricted feeding. Genetic enhancement of adipocyte thermogenesis through ablation of Zfp423 attenuates obesity caused by circadian mistimed high fat diet feeding through a mechanism involving creatine metabolism. Circadian control of adipocyte creatine metabolism underlies timing of diet-induced thermogenesis, and enhancement of adipocyte circadian rhythms through overexpression of the clock activator Bmal1 ameliorates metabolic complications during diet induced obesity. These findings establish creatine mediated diet-induced thermogenesis as a bioenergetic mechanism driving metabolic benefits during time-restricted feeding.
2022-10-24 | GSE181443 | GEO