RNAseq analysis of adipose tissue transcriptomes from wild-type and FNIP1 adipocyte specific knockout (FNIP1-AKO) mice
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA767577 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR16126944_1.fastq.gz | Fastqsanger.gz | |||
| SRR16126944_2.fastq.gz | Fastqsanger.gz | |||
| SRR16126945_1.fastq.gz | Fastqsanger.gz | |||
| SRR16126945_2.fastq.gz | Fastqsanger.gz | |||
| SRR16126946_1.fastq.gz | Fastqsanger.gz |
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Project description:Activation of thermogenesis in brown and beige adipocytes upon activation by external stimuli burns fuel energy as heat. Owing to its remarkable benefits on metabolic health and its demonstrated presence in adult humans, beige adipocytes holds great promise to combat obesity and metabolic diseases. Folliculin interacting protein 1 (FNIP1) is an adaptor protein originally identified through its interaction with folliculin (FLCN) and AMPK. To investigate the physiological role of FNIP1 in adipose tissue in vivo, we generated adipocyte-specific FNIP1 deficient mice (referred to as FNIP1-AKO) by crossing mice bearing a conditional Fnip1 allele with introns 5 and 6 floxed (Fnip1 lox/lox) with the adiponectin promoter–driven Cre mice. We performed transcriptome analysis by whole-genome gene expression profiling experiments in inguinal white adipose tissue (iWAT) from both wild-type (WT) and FNIP1-AKO mice. We were particularly interested in the subset of genes that were up-regulated in the FNIP1-AKO mice. Gene ontology (GO) analysis revealed that the primary up-regulated genes were mitochondrial and lipid metabolism-related genes. Gene expression validation studies demonstrated that a broad array of genes involved in thermogenic and mitochondrial oxidative program was induced in FNIP1-AKO iWAT. Together, the transcriptional profiling results indicate that loss of FNIP1 activate thermogenic program in white adipocytes.
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Project description:Objectives: Studies have shown a correlation between obesity and mitochondrial calcium homeostasis, yet it is unclear whether and how Mcu regulates adipocyte lipid deposition. This study aims to provide new potential target for the treatment of obesity and related metabolic diseases, and to explore the function of Mcu in adipose tissue. Methods: We firstly investigated the role of mitoxantrone, an Mcu inhibitor, in the regulation of glucose and lipid metabolism in mouse adipocytes (3T3-L1 cells). Secondly, C57BL/6J mice were used as a research model to investigate the effects of Mcu inhibitors on fat accumulation and glucose metabolism in mice on a high-fat diet (HFD), and by using CRISPR/Cas9 technology, adipose tissue-specific Mcu knockdown mice (Mcu fl/+ AKO) and Mcu knockout of mice (Mcu fl/fl AKO) were obtained, to further investigate the direct effects of Mcu on fat deposition, glucose tolerance and insulin sensitivity in mice on a high-fat diet. Results: we found the Mcu inhibitor reduced adipocytes lipid accumulation and adipose tissues mass in mice fed an HFD. Both Mcu fl/+ AKO mice and Mcu fl/fl AKO mice were resistant to HFD-induced obesity, compared to control mice. Mice with Mcu fl/fl AKO showed improved glucose tolerance and insulin sensitivity as well as reduced hepatic lipid accumulation. Mechanistically, inhibition of Mcu promoted mitochondrial biogenesis and adipocyte browning, increase energy expenditure and alleviates diet-induced obesity. Conclusion: Our study demonstrates a link between adipocyte lipid accumulation and mCa2+ levels, suggesting that adipose-specific Mcu deficiency alleviates HFD-induced obesity and ameliorates metabolic disorders such as insulin resistance and hepatic steatosis. These effects may be achieved by increasing mitochondrial biosynthesis, promoting white fat browning and enhancing energy metabolism.
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Project description:This experiment was conducted to identify FNIP1-dependent mRNA transcripts alteration in skeletal muscle. Mouse FNIP1 was specifically overexpressed in skeletal muscle in FNIP1-transgenic (FNIP1-Tg) mice. FNIP1-Tg mice were crossed with FNIP1-knockout (FNIP1-KO) mice to generate FNIP1-TgKO mice expressing FNIP1 only in skeletal muscle but not in other tissues. The muscle glycolytic-to-oxidative transformation is determined, largely in part, at the level of gene expression. To gain insight into the FNIP1-dependent regulation of skeletal muscle energy metabolism, transcriptome analysis was performed by whole-genome gene expression profiling experiments in gastrocnemius (GC) muscle from both FNIP1-KO and FNIP1-TGKO mice. We were particularly interested in the subset of genes that were regulated only in the FNIP1-KO mice but not in FNIP1-TGKO mice. Gene ontology (GO) analysis revealed that the primary FNIP1-regulated genes were mitochondrial metabolic genes. A broad array of genes involved in mitochondria was regulated FNIP1-KO muscle in a FNIP1-dependent manner. Together, the transcriptional profiling results indicate that a significant subset of FNIP1 target genes, were those involved in mitochondrial function.
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Project description:The adipose tissue is a key site regulating energy metabolism. One of the contributing factors behind this is browning of white adipose tissue (WAT), however, knowledge of the intracellular determinants of browning process remains incomplete. By generating adipocyte-specific Senp2 knockout (Senp2-aKO) mice, here we showed that SENP2 negatively regulates browning by de-conjugating SUMO from C/EBPβ. Senp2-aKO mice were resistant to diet-induced obesity and insulin resistance due to increased energy expenditure and heat production. Senp2 knockout promoted beige adipocyte accumulation in inguinal WAT by upregulation of thermogenic gene expression. In addition, SENP2 knockdown promoted thermogenic adipocyte differentiation of precursor cells isolated from inguinal and epididymal WATs. Mechanistically, sumoylated C/EBPβ, a target of SENP2, suppressed expression of HOXC10, a browning inhibitor, by recruiting a transcriptional repressor DAXX. These findings indicate that a SENP2-C/EBPβ-HOXC10 axis operates for the control of beige adipogenesis in inguinal WAT.
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Project description:Mitochondrial proteases are emerging as key regulators of mitochondrial plasticity acting both as protein quality surveillance and regulatory enzymes by performing highly regulated proteolytic reactions. It remains unclear, however, whether the regulated mitochondrial proteolysis is mechanistically linked to cell identity switch such as white-to-beige conversion of adipocytes. We found that disruption of LONP1-dependent proteolysis substantially impairs thermogenic molecular program and cellular respiration in in vitro differentiated primary adipocytes. qPCR analysis showed that expression levels of Ucp1 and other beige adipocyte thermogenic genes were remarkably downregulated in LONP1 AKO adipocytes. We took a deeper dive into the characterization of histone modifications in LONP1 AKO adipocytes using the global enhancer marker H3K4me1 ChIP-Seq. These unbiased ChIP seq data are strong evidence of that LONP1 loss results in decreased H3K4me1 on a broad array of thermogenic genes. These results collectively indicate that LONP1 is crucial to maintain proper epigenetic homeostasis and beige thermogenic gene expression.
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