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Project description:We generated a Tcf7l2 F/F mouse and harvested preadipocytes rom these mice, immortalized them, and then transduced them with a retroviral vector containing CreERT2 and , differentiated them, performed ChIP-seq, and RNA-seq. We also generated and adipsoe specific knockout mouse where we crossed our Tcf7 F/Fmouse with an Adiponectin-Cre mice and performed RNA-seq on the inguimal white adipose tissue after 16 weeks of high fat diet, 65% Conclusions: Our study shows that knocking of Tcf7l2 results in enhanced adipocyte differentiation
2019-08-01 | GSE129404 | GEO
Project description:We generated a Tcf7l2 F/F mouse and harvested preadipocytes from these mice, immortalized them, and then transduced them with a retroviral vector containing CreERT2 and , differentiated them, performed ChIP-seq, and RNA-seq. We also generated an adipose specific knockout mouse where we crossed our Tcf7 F/Fmouse with an Adiponectin-Cre mice and performed RNA-seq on the inguinal white adipose tissue after 16 weeks of high fat diet, 65% Conclusions: Adipsose selective deletion of Tcf7l2 led to hypertrophic inguinal white adipose tissue and impaired glucose metabolsim with transcripts involved in lipid and glucose metabolsim being altered.
2019-08-01 | GSE129402 | GEO
Project description:ObjectiveActivation of the Wnt-signaling pathway is known to inhibit differentiation in adipocytes. However, there is a gap in our understanding of the transcriptional network regulated by components of the Wnt-signaling pathway during adipogenesis and in adipocytes during postnatal life. The key intracellular effectors of the Wnt-signaling pathway occur through TCF transcription factors such as TCF7L2 (transcription factor-7-like 2). Several genetic variants in proximity to TCF7L2 have been linked to type 2 diabetes through genome-wide association studies in various human populations. Our work aims to functionally characterize the adipocyte specific gene program regulated by TCF7L2 and understand how this program regulates metabolism.MethodsWe generated Tcf7l2F/F mice and assessed TCF7L2 function in isolated adipocytes and adipose specific knockout mice. ChIP-sequencing and RNA-sequencing was performed on the isolated adipocytes with control and TCF7L2 knockout cells. Adipose specific TCF7L2 knockout mice were challenged with high fat diet and assessed for body weight, glucose tolerance, and lipolysis.ResultsHere we report that TCF7L2 regulates adipocyte size, endocrine function, and glucose metabolism. Tcf7l2 is highly expressed in white adipose tissue, and its expression is suppressed in genetic and diet-induced models of obesity. Genome-wide distribution of TCF7L2 binding and gene expression analysis in adipocytes suggests that TCF7L2 directly regulates genes implicated in cellular metabolism and cell cycle control. When challenged with a high-fat diet, conditional deletion of TCF7L2 in adipocytes led to impaired glucose tolerance, impaired insulin sensitivity, promoted weight gain, and increased adipose tissue mass. This was accompanied by reduced expression of triglyceride hydrolase, reduced fasting-induced free fatty acid release, and adipocyte hypertrophy in subcutaneous adipose tissue.ConclusionsTogether our studies support that TCF7L2 is a central transcriptional regulator of the adipocyte metabolic program by directly regulating the expression of genes involved in lipid and glucose metabolism.
| S-EPMC6531814 | biostudies-literature
Project description:We generated a Tcf7l2 F/F mouse and harvested preadipocytes rom these mice, immortalized them, and then transduced them with a retroviral vector containing CreERT2 and , differentiated them, performed ChIP-seq, and RNA-seq. We also generated and adipsoe specific knockout mouse where we crossed our Tcf7 F/Fmouse with an Adiponectin-Cre mice and performed RNA-seq on the inguimal white adipose tissue after 16 weeks of high fat diet, 65%
2019-08-01 | GSE129403 | GEO
Project description:Targeted deletion of Tcf7l2 in adipocytes promotes adipocyte hypertrophy and impaired gluose metabolism
| PRJNA531175 | ENA
Project description:Targeted deletion of Tcf7l2 in adipocytes promotes adipocyte hypertrophy and impaired gluose metabolism [preadipocytes]
| PRJNA531180 | ENA
Project description:Targeted deletion of Tcf7l2 in adipocytes promotes adipocyte hypertrophy and impaired gluose metabolism [HFD]
| PRJNA531177 | ENA
Project description:Targeted deletion of Tcf7l2 in adipocytes promotes adipocyte hypertrophy and impaired gluose metabolism [ChIP-seq]
| PRJNA531178 | ENA
Project description:Aims/hypothesisTranscription factor 7-like 2 (TCF7L2) is a downstream effector of the Wnt/β-catenin signalling pathway implicated in type 2 diabetes risk through genome-wide association studies. Although its expression is critical for adipocyte development, the potential roles of changes in adipose tissue TCF7L2 levels in diabetes risk are poorly defined. Here, we investigated whether forced changes in Tcf7l2 expression in adipocytes affect whole body glucose or lipid metabolism and crosstalk between disease-relevant tissues.MethodsTcf7l2 was selectively ablated in mature adipocytes in C57BL/6J mice using Cre recombinase under Adipoq promoter control to recombine Tcf7l2 alleles floxed at exon 1 (referred to as aTCF7L2 mice). aTCF7L2 mice were fed normal chow or a high-fat diet for 12 weeks. Glucose and insulin sensitivity, as well as beta cell function, were assessed in vivo and in vitro. Levels of circulating NEFA, selected hormones and adipokines were measured using standard assays.ResultsReduced TCF7L2 expression in adipocytes altered glucose tolerance and insulin secretion in male but not in female mice. Thus, on a normal chow diet, male heterozygote knockout mice (aTCF7L2het) exhibited impaired glucose tolerance at 16 weeks (p = 0.03) and increased fat mass (1.4 ± 0.1-fold, p = 0.007) but no changes in insulin secretion. In contrast, male homozygote knockout (aTCF7L2hom) mice displayed normal body weight but impaired oral glucose tolerance at 16 weeks (p = 0.0001). These changes were mechanistically associated with impaired in vitro glucose-stimulated insulin secretion (decreased 0.5 ± 0.1-fold vs control mice, p = 0.02) and decreased levels of the incretins glucagon-like peptide-1 and glucose-dependent insulinotropic polypeptide (0.6 ± 0.1-fold and 0.4 ± 0.1-fold vs control mice, p = 0.04 and p < 0.0001, respectively). Circulating levels of plasma NEFA and fatty acid binding protein 4 were increased by 1.3 ± 0.1-fold and 1.8 ± 0.3-fold vs control mice (p = 0.03 and p = 0.05, respectively). Following exposure to a high-fat diet for 12 weeks, male aTCF7L2hom mice exhibited reduced in vivo glucose-stimulated insulin secretion (0.5 ± 0.1-fold vs control mice, p = 0.02).Conclusions/interpretationLoss of Tcf7l2 gene expression selectively in adipocytes leads to a sexually dimorphic phenotype, with impairments not only in adipocytes, but also in pancreatic islet and enteroendocrine cells in male mice only. Our findings suggest novel roles for adipokines and incretins in the effects of diabetes-associated variants in TCF7L2, and further illuminate the roles of TCF7L2 in glucose homeostasis and diabetes risk. Graphical abstract.
| S-EPMC7567653 | biostudies-literature
Project description:BackgruoundPrevious studies have reported that oxidative stress contributes to obesity characterized by adipocyte hypertrophy. However, mechanism has not been studied extensively. In the current study, we evaluated role of extracellular vimentin secreted by oxidized low-density lipoprotein (oxLDL) in energy metabolism in adipocytes.MethodsWe treated 3T3-L1-derived adipocytes with oxLDL and measured vimentin which was secreted in the media. We evaluated changes in uptake of glucose and free fatty acid, expression of molecules functioning in energy metabolism, synthesis of adenosine triphosphate (ATP) and lactate, markers for endoplasmic reticulum (ER) stress and autophagy in adipocytes treated with recombinant vimentin.ResultsAdipocytes secreted vimentin in response to oxLDL. Microscopic evaluation revealed that vimentin treatment induced increase in adipocyte size and increase in sizes of intracellular lipid droplets with increased intracellular triglyceride. Adipocytes treated with vimentin showed increased uptake of glucose and free fatty acid with increased expression of plasma membrane glucose transporter type 1 (GLUT1), GLUT4, and CD36. Vimentin treatment increased transcription of GLUT1 and hypoxia-inducible factor 1α (Hif-1α) but decreased GLUT4 transcription. Adipose triglyceride lipase (ATGL), peroxisome proliferator-activated receptor γ (PPARγ), sterol regulatory element-binding protein 1 (SREBP1), diacylglycerol O-acyltransferase 1 (DGAT1) and 2 were decreased by vimentin treatment. Markers for ER stress were increased and autophagy was impaired in vimentin-treated adipocytes. No change was observed in synthesis of ATP and lactate in the adipocytes treated with vimentin.ConclusionWe concluded that extracellular vimentin regulates expression of molecules in energy metabolism and promotes adipocyte hypertrophy. Our results show that vimentin functions in the interplay between oxidative stress and metabolism, suggesting a mechanism by which adipocyte hypertrophy is induced in oxidative stress.
| S-EPMC10995492 | biostudies-literature