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Loss of SNORA73 reprograms cellular metabolism and protects against steatohepatitis

ABSTRACT: Loss of SNORA73 reprograms cellular metabolism and protects against steatohepatitis

PROVIDER: PRJNA742760 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR15010073_1.fastq.gz	Fastqsanger.gz
	SRR15010073_2.fastq.gz	Fastqsanger.gz
	SRR15010074_1.fastq.gz	Fastqsanger.gz
	SRR15010074_2.fastq.gz	Fastqsanger.gz
	SRR15010075_1.fastq.gz	Fastqsanger.gz

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Loss of SNORA73 reprograms cellular metabolism and protects against steatohepatitis

Project description:Dyslipidemia and resulting lipotoxicity are pathologic signatures of metabolic syndrome and type 2 diabetes. Excess lipid causes cell dysfunction and induces cell death through pleiotropic mechanisms that link to oxidative stress. However, pathways that regulate the response to metabolic stress are not well understood. Herein, we show that disruption of the box H/ACA SNORA73 small nucleolar RNAs encoded within the small nucleolar RNA hosting gene 3 (Snhg3) causes resistance to lipid-induced cell death and general oxidative stress in cultured cells. This protection from metabolic stress is associated with broad reprogramming of oxidative metabolism that is dependent on the mammalian target of rapamycin signaling axis. Furthermore, we show that knockdown of SNORA73 in vivo protects against hepatic steatosis and lipid-induced oxidative stress and inflammation. Our findings demonstrate a role for SNORA73 in the regulation of metabolism and lipotoxicity.

2021-07-26 | GSE179228 | GEO

Loss of SNORA73 reprograms cellular metabolism and protects against steatohepatitis.

| S-EPMC8410784 | biostudies-literature

Rictor/mTORC2 loss in the Myf5 lineage reprograms brown fat metabolism and protects mice against obesity and metabolic disease.

Project description:The in vivo functions of mechanistic target of rapamycin complex 2 (mTORC2) and the signaling mechanisms that control brown adipose tissue (BAT) fuel utilization and activity are not well understood. Here, by conditionally deleting Rictor in the Myf5 lineage, we provide in vivo evidence that mTORC2 is dispensable for skeletal muscle development and regeneration but essential for BAT growth. Furthermore, deleting Rictor in Myf5 precursors shifts BAT metabolism to a more oxidative and less lipogenic state and protects mice from obesity and metabolic disease at thermoneutrality. We additionally find that Rictor is required for brown adipocyte differentiation in vitro and that the mechanism specifically requires AKT1 hydrophobic motif phosphorylation but is independent of pan-AKT signaling and is rescued with BMP7. Our findings provide insights into the signaling circuitry that regulates brown adipocytes and could have important implications for developing therapies aimed at increasing energy expenditure as a means to combat human obesity.

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Dynamic metabolism of endothelial triglycerides protects against atherosclerosis

Project description:Dynamic metabolism of endothelial triglycerides protects against atherosclerosis

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Dynamic metabolism of endothelial triglycerides protects against atherosclerosis

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CARM1 reprograms fatty acid metabolism to promote ovarian cancer

Project description:Fatty acids are critical energy sources and structural components of cells. We investigate how CARM1 reprograms fatty acid metabolism to promote ovarian cancer

2023-03-29 | GSE202259 | GEO

Yap reprograms glutamine metabolism to increase nucleotide biosynthesis and enable liver growth

Project description:The Hippo pathway is an important regulator of organ size and tumorigenesis. It is unclear, however, how Hippo signaling provides the cellular building blocks required for rapid growth. Here, we report that transgenic zebrafish expressing an activated form of the Hippo pathway effector Yap1 develop enlarged livers and are prone to liver tumor formation. Transcriptomic profiling reveals that Yap1 reprograms genes involved in glutamine metabolism. Analysis of gene expression in WT and lf:Yap transgenic zebrafish livers.

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Maternal slimming reprograms metabolic gene expression in mice offspring

Project description:This SuperSeries is composed of the following subset Series: GSE40471: Maternal slimming reprograms metabolic gene expression in mice offspring (NimbleGen expression) GSE40477: Maternal slimming reprograms metabolic gene expression in mice offspring (NimbleGen methylation) GSE40478: Maternal slimming reprograms metabolic gene expression in mice offspring (mRNA-Seq) Refer to individual Series

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Reprogrammed lipid metabolism protects inner nuclear membrane against unsaturated fat

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Loss of EZH2 Reprograms BCAA Metabolism to Drive Leukemic Transformation.

Project description:Epigenetic gene regulation and metabolism are highly intertwined, yet little is known about whether altered epigenetics influence cellular metabolism during cancer progression. Here, we show that EZH2 and NRASG12D mutations cooperatively induce progression of myeloproliferative neoplasms to highly penetrant, transplantable, and lethal myeloid leukemias in mice. EZH1, an EZH2 homolog, is indispensable for EZH2-deficient leukemia-initiating cells and constitutes an epigenetic vulnerability. BCAT1, which catalyzes the reversible transamination of branched-chain amino acids (BCAA), is repressed by EZH2 in normal hematopoiesis and aberrantly activated in EZH2-deficient myeloid neoplasms in mice and humans. BCAT1 reactivation cooperates with NRASG12D to sustain intracellular BCAA pools, resulting in enhanced mTOR signaling in EZH2-deficient leukemia cells. Genetic and pharmacologic inhibition of BCAT1 selectively impairs EZH2-deficient leukemia-initiating cells and constitutes a metabolic vulnerability. Hence, epigenetic alterations rewire intracellular metabolism during leukemic transformation, causing epigenetic and metabolic vulnerabilities in cancer-initiating cells. SIGNIFICANCE: EZH2 inactivation and oncogenic NRAS cooperate to induce leukemic transformation of myeloproliferative neoplasms by activating BCAT1 to enhance BCAA metabolism and mTOR signaling. We uncover a mechanism by which epigenetic alterations rewire metabolism during cancer progression, causing epigenetic and metabolic liabilities in cancer-initiating cells that may be exploited as potential therapeutics.See related commentary by Li and Melnick, p. 1158.This article is highlighted in the In This Issue feature, p. 1143.

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