scholarly journals Depletion of ATP-Citrate Lyase (ATPCL) Affects Chromosome Integrity Without Altering Histone Acetylation in Drosophila Mitotic Cells

2019 ◽  
Vol 10 ◽  
Author(s):  
Patrizia Morciano ◽  
Maria Laura Di Giorgio ◽  
Antonella Porrazzo ◽  
Valerio Licursi ◽  
Rodolfo Negri ◽  
...  
Keyword(s):  
Histone Acetylation ◽  
Atp Citrate Lyase ◽  
Citrate Lyase ◽  
Chromosome Integrity ◽  
Mitotic Cells

Abstract 15978: Acetyl-coa Catalysis by Atp-citrate Lyase is Essential for Myofibroblast Differentiation and Persistence

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
Michael P Lazaropoulos ◽  
Andrew A Gibb ◽  
Anh Huynh ◽  
Kathryn Wellen ◽  
John W Elrod
Keyword(s):  
Histone Acetylation ◽  
Transcriptional Activation ◽  
Cardiac Fibrosis ◽  
Transforming Growth Factor ◽  
Metabolic Reprogramming ◽  
Myofibroblast Differentiation ◽  
Atp Citrate Lyase ◽  
Acetyl Coa ◽  
Matrix Deposition ◽  
Citrate Lyase

A feature of heart failure (HF) is excessive extracellular matrix deposition and cardiac remodeling by a differentiated fibroblast population known as myofibroblasts. Identifying mechanisms of myofibroblast differentiation in cardiac fibrosis could yield novel therapeutic targets to delay or reverse HF. Recent evidence suggests that myofibroblast differentiation requires metabolic reprogramming for transcriptional activation of the myofibroblast gene program by chromatin-dependent mechanisms. We previously reported that inhibition of histone demethylation blocks myofibroblast formation, however, whether histone acetylation (e.g., H3K27ac, a prominent mark associated with gene transcription) is involved in fibroblast reprogramming remains unclear. ATP-citrate lyase (ACLY) synthesizes acetyl-CoA and therein supplies acetyl-CoA to the nucleus, where it is used as a substrate by histone acetyltransferases (HATs). To define the role of acetyl-CoA metabolism in myofibroblast differentiation, we stimulated differentiation in mouse embryonic fibroblasts (MEFs) and adult mouse cardiac fibroblasts (ACFs) with the pro-fibrotic agonist transforming growth factor β (TGFβ) and treated cells with a pharmacological inhibitor of ACLY. ACLY inhibition decreased myofibroblast gene expression in ACF and MEFs in TGFβ-stimulated myofibroblast differentiation, in addition to decreasing the population of αSMA positive MEFs. Genetic deletion of ACLY in MEFs recapitulated the results observed with pharmacological inhibition. Encouragingly, the ACLY inhibitor was sufficient to revert fully differentiated myofibroblasts under continuous TGFβ stimulation to a quiescent, non-fibrotic phenotype. Altogether, our data indicate that ACLY activity is necessary for myofibroblast differentiation and persistence. We hypothesize that ACLY-dependent acetyl-CoA synthesis is necessary for histone acetylation and transcriptional activation of the myofibroblast gene program. Currently, we are examining mechanisms of ACLY-dependent chromatin remodeling in fibroblasts and the in vivo relevance of this mechanism in mutant mice. In summary, ACLY is a potential target to reverse cardiac fibrosis and lessen HF.

scholarly journals ATP Citrate Lyase Regulates Myofiber Differentiation and Increases Regeneration by Altering Histone Acetylation

Cell Reports ◽  
2017 ◽  
Vol 21 (11) ◽  
pp. 3003-3011 ◽  
Author(s):  
Suman Das ◽  
Frederic Morvan ◽  
Giulio Morozzi ◽  
Benjamin Jourde ◽  
Giulia C. Minetti ◽  
...  
Keyword(s):  
Histone Acetylation ◽  
Atp Citrate Lyase ◽  
Citrate Lyase

scholarly journals ATP-citrate lyase is essential for high glucose-induced histone hyperacetylation and fibrogenic gene upregulation in mesangial cells

2017 ◽  
Vol 313 (2) ◽  
pp. F423-F429 ◽  
Author(s):  
Dilip K. Deb ◽  
Yinyin Chen ◽  
Jian Sun ◽  
Youli Wang ◽  
Yan Chun Li
Keyword(s):  
Histone Acetylation ◽  
High Glucose ◽  
Mesangial Cells ◽  
Nuclear Accumulation ◽  
Atp Citrate Lyase ◽  
Acetyl Coa ◽  
Ecm Proteins ◽  
Histone Hyperacetylation ◽  
Citrate Lyase ◽  
Tgf Β1

The goal of this study was to address the role of ATP-citrate lyase (ACL), an enzyme that converts citrate to acetyl-CoA, in high glucose (HG)-induced histone acetylation and profibrotic gene expression. Our recent ChIP-Seq studies have demonstrated that HG induces genome-wide histone hyperacetylation in mesangial cells (MCs). Here, we showed that exposure of MCs to HG markedly increased histone acetylation at the H3K9/14 and H3K18 marks and induced the expression of potent profibrotic factors TGF-β1, TGF-β3, and connective tissue growth factor (CTGF). The induction of these profibrotic factors was further enhanced by histone deacetylase inhibitor but suppressed by histone acetyl-transferase inhibitor, confirming the importance of histone acetylation in this regulation. Interestingly, HG not only upregulated ACL expression but also promoted ACL nuclear translocation, evidenced by increased ACL concentration and activity in the nuclear extracts. Consistent with this observation, transfection of MCs with a plasmid-carrying green fluorescent protein (GFP)-ACL fusion protein led to GFP nuclear accumulation when cultured in HG condition. Silencing ACL with siRNAs alleviated HG-induced histone hyperacetylation, as well as upregulation of TGF-β1, TGF-β3, CTGF, and extracellular matrix (ECM) proteins fibronectin and collagen type IV, whereas ACL overexpression further enhanced HG induction of histone acetylation, as well as these profibrotic factors and ECM proteins. Collectively, these observations demonstrate that HG promotes ACL expression and translocation into the nucleus, where ACL converts citrate to acetyl-CoA to provide the substrate for histone acetylation, leading to upregulation of fibrogenic genes. Therefore, ACL plays a critical role in epigenetic regulation of diabetic renal fibrosis.

scholarly journals Plenary Lecture 2 Transcription factors, regulatory elements and nutrient–gene communication

2009 ◽  
Vol 69 (1) ◽  
pp. 91-94 ◽  
Author(s):  
Robert J. Cousins ◽  
Tolunay B. Aydemir ◽  
Louis A. Lichten
Keyword(s):  
Transcription Factors ◽  
Histone Acetylation ◽  
Intracellular Transport ◽  
Molecular Mechanisms ◽  
Gene Activation ◽  
Regulatory Elements ◽  
Atp Citrate Lyase ◽  
Signalling Molecules ◽  
Citrate Lyase ◽  
Normal Metabolism

Dramatic advances have been made in the understanding of the differing molecular mechanisms used by nutrients to regulate genes that are essential for their biological roles to carry out normal metabolism. Classical studies have focused on nutrients as ligands to activate specific transcription factors. New interest has focused on histone acetylation as a process for either global or limited gene activation and is the first mechanism to be discussed. Nuclear ATP-citrate lyase generates acetyl-CoA, which has been shown to have a role in the activation of specific genes via selective histone acetylation. Transcription factor acetylation may provide a second mode of control of nutrient-responsive gene transcription. The third mechanism relates to the availability of response elements within chromatin, which as well as the location of the elements in the gene may allow or prevent transcription. A fourth mechanism involves intracellular transport of Zn ions, which can orchestrate localized enzyme inhibition–activation. This process in turn influences signalling molecules that regulate gene expression. The examples provided in the present review point to a new level of complexity in understanding nutrient–gene communication.

scholarly journals The Drosophila Citrate Lyase Is Required for Cell Division during Spermatogenesis

Cells ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 206
Author(s):  
Maria Laura Di Giorgio ◽  
Patrizia Morciano ◽  
Elisabetta Bucciarelli ◽  
Antonella Porrazzo ◽  
Francesca Cipressa ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Cell Division ◽  
Histone Acetylation ◽  
Male Meiosis ◽  
Metabolic Enzyme ◽  
Atp Citrate Lyase ◽  
Acetyl Coa ◽  
Alternative Pathways ◽  
Citrate Lyase ◽  
First Time

The Drosophila melanogaster DmATPCL gene encodes for the human ATP Citrate Lyase (ACL) ortholog, a metabolic enzyme that from citrate generates glucose-derived Acetyl-CoA, which fuels central biochemical reactions such as the synthesis of fatty acids, cholesterol and acetylcholine, and the acetylation of proteins and histones. We had previously reported that, although loss of Drosophila ATPCL reduced levels of Acetyl-CoA, unlike its human counterpart, it does not affect global histone acetylation and gene expression, suggesting that its role in histone acetylation is either partially redundant in Drosophila or compensated by alternative pathways. Here, we describe that depletion of DmATPCL affects spindle organization, cytokinesis, and fusome assembly during male meiosis, revealing an unanticipated role for DmATPCL during spermatogenesis. We also show that DmATPCL mutant meiotic phenotype is in part caused by a reduction of fatty acids, but not of triglycerides or cholesterol, indicating that DmATPCL-derived Acetyl-CoA is predominantly devoted to the biosynthesis of fatty acids during spermatogenesis. Collectively, our results unveil for the first time an involvement for DmATPCL in the regulation of meiotic cell division, which is likely conserved in human cells.

scholarly journals Impact of a High-fat Diet on Tissue Acyl-CoA and Histone Acetylation Levels

2017 ◽  
Vol 292 (8) ◽  
pp. 3312-3322 ◽  
Author(s):  
Alessandro Carrer ◽  
Joshua L. D. Parris ◽  
Sophie Trefely ◽  
Ryan A. Henry ◽  
David C. Montgomery ◽  
...  
Keyword(s):  
Histone Acetylation ◽  
High Fat Diet ◽  
Cell Types ◽  
High Fat ◽  
Atp Citrate Lyase ◽  
Acetyl Coa ◽  
Citrate Lyase ◽  
Liver And Pancreas ◽  
The Impact

Cellular metabolism dynamically regulates the epigenome via availability of the metabolite substrates of chromatin-modifying enzymes. The impact of diet on the metabolism-epigenome axis is poorly understood but could alter gene expression and influence metabolic health. ATP citrate-lyase produces acetyl-CoA in the nucleus and cytosol and regulates histone acetylation levels in many cell types. Consumption of a high-fat diet (HFD) results in suppression of ATP citrate-lyase levels in tissues such as adipose and liver, but the impact of diet on acetyl-CoA and histone acetylation in these tissues remains unknown. Here we examined the effects of HFD on levels of acyl-CoAs and histone acetylation in mouse white adipose tissue (WAT), liver, and pancreas. We report that mice consuming a HFD have reduced levels of acetyl-CoA and/or acetyl-CoA:CoA ratio in these tissues. In WAT and the pancreas, HFD also impacted the levels of histone acetylation; in particular, histone H3 lysine 23 acetylation was lower in HFD-fed mice. Genetic deletion of Acly in cultured adipocytes also suppressed acetyl-CoA and histone acetylation levels. In the liver, no significant effects on histone acetylation were observed with a HFD despite lower acetyl-CoA levels. Intriguingly, acetylation of several histone lysines correlated with the acetyl-CoA: (iso)butyryl-CoA ratio in liver. Butyryl-CoA and isobutyryl-CoA interacted with the acetyltransferase P300/CBP-associated factor (PCAF) in liver lysates and inhibited its activity in vitro. This study thus provides evidence that diet can impact tissue acyl-CoA and histone acetylation levels and that acetyl-CoA abundance correlates with acetylation of specific histone lysines in WAT but not in the liver.

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