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Zhou C, Ruiz HH, Ling L, Maurizi G, Sakamoto K, Liberini CG, Wang L, Stanley A, Egritag HE, Sanz SM, Lindtner C, Butera MA, Buettner C. Sympathetic overdrive and unrestrained adipose lipolysis drive alcohol-induced hepatic steatosis in rodents. Mol Metab 2023; 78:101813. [PMID: 37777008 PMCID: PMC10590866 DOI: 10.1016/j.molmet.2023.101813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 09/26/2023] [Accepted: 09/27/2023] [Indexed: 10/02/2023] Open
Abstract
OBJECTIVE Hepatic steatosis is a key initiating event in the pathogenesis of alcohol-associated liver disease (ALD), the most detrimental organ damage resulting from alcohol use disorder. However, the mechanisms by which alcohol induces steatosis remain incompletely understood. We have previously found that alcohol binging impairs brain insulin action, resulting in increased adipose tissue lipolysis by unrestraining sympathetic nervous system (SNS) outflow. Here, we examined whether an impaired brain-SNS-adipose tissue axis drives hepatic steatosis through unrestrained adipose tissue lipolysis and increased lipid flux to the liver. METHODS We examined the role of lipolysis, and the brain-SNS-adipose tissue axis and stress in alcohol induced hepatic triglyceride accumulation in a series of rodent models: pharmacological inhibition of the negative regulator of insulin signaling protein-tyrosine phosphatase 1β (PTP1b) in the rat brain, tyrosine hydroxylase (TH) knockout mice as a pharmacogenetic model of sympathectomy, adipocyte specific adipose triglyceride lipase (ATGL) knockout mice, wildtype (WT) mice treated with β3 adrenergic agonist or undergoing restraint stress. RESULTS Intracerebral administration of a PTP1b inhibitor, inhibition of adipose tissue lipolysis and reduction of sympathetic outflow ameliorated alcohol induced steatosis. Conversely, induction of adipose tissue lipolysis through β3 adrenergic agonism or by restraint stress worsened alcohol induced steatosis. CONCLUSIONS Brain insulin resistance through upregulation of PTP1b, increased sympathetic activity, and unrestrained adipose tissue lipolysis are key drivers of alcoholic steatosis. Targeting these drivers of steatosis may provide effective therapeutic strategies to ameliorate ALD.
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Affiliation(s)
- Chunxue Zhou
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Henry H Ruiz
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Li Ling
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Giulia Maurizi
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kenichi Sakamoto
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA; Division of Endocrinology, Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| | - Claudia G Liberini
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Ling Wang
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Adrien Stanley
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Hale E Egritag
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Sofia M Sanz
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Claudia Lindtner
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Mary A Butera
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA; Division of Endocrinology, Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| | - Christoph Buettner
- Department of Medicine and Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA; Division of Endocrinology, Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ, USA.
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2
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Li J, Wang Y, Yang P, Han H, Zhang G, Xu H, Quan K. Overexpression of ATGL impairs lipid droplet accumulation by accelerating lipolysis in goat mammary epithelial cells. Anim Biotechnol 2023; 34:3126-3134. [PMID: 36306180 DOI: 10.1080/10495398.2022.2136678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Adipose triglyceride lipase (ATGL) is the key enzyme for the degradation of triacylglycerols (TAGs). It functions in concert with other enzymes to mobilize TAG and supply fatty acids (FAs) for energy production. Dysregulated lipolysis leads to excess concentrations of circulating FAs, which may lead to destructive and lipotoxic effects to the organism. To understand the role of ATGL in mammary lipid metabolism, ATGL was overexpressed in goat mammary epithelial cells (GMECs) by using a recombinant adenovirus system. ATGL overexpression decreased lipid droplet (LD) accumulation and cellular TG content (p < 0.05) along with a decrease in the expression of the key enzyme that catalyzes the final step of TG synthesis (DGAT). Significant increases were observed in the expression of genes related to lipolysis (hormone-sensitive lipase [HSL]) and FA desaturation (SCD) by ATGL overexpression. Genes responsible for FA oxidation (PPARα), LD formation and secretion (ADRP and BTN1A1), and long-chain FA uptake (CD36) were all decreased by ATGL overexpression (p < 0.05). The primary products of TAG lipolysis, free FAs (FFAs), were notably increased in the ATGL-overexpressing cells. Taken together, our results demonstrated that ATGL activation impairs lipid formation partially through accelerating lipolysis in GMECs.
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Affiliation(s)
- Jun Li
- College of Animal Science and Technology, Henan University of Animal Husbandry and Economy, Zhengzhou, PR China
| | - Yaling Wang
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou, PR China
| | - Pengkun Yang
- College of Animal Science and Technology, Henan University of Animal Husbandry and Economy, Zhengzhou, PR China
| | - Haoyuan Han
- College of Animal Science and Technology, Henan University of Animal Husbandry and Economy, Zhengzhou, PR China
| | - Guizhi Zhang
- College of Animal Science and Technology, Henan University of Animal Husbandry and Economy, Zhengzhou, PR China
| | - Huifen Xu
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou, PR China
| | - Kai Quan
- College of Animal Science and Technology, Henan University of Animal Husbandry and Economy, Zhengzhou, PR China
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3
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Jovičić EJ, Janež AP, Eichmann TO, Koren Š, Brglez V, Jordan PM, Gerstmeier J, Lainšček D, Golob-Urbanc A, Jerala R, Lambeau G, Werz O, Zimmermann R, Petan T. Lipid droplets control mitogenic lipid mediator production in human cancer cells. Mol Metab 2023; 76:101791. [PMID: 37586657 PMCID: PMC10470291 DOI: 10.1016/j.molmet.2023.101791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 07/29/2023] [Accepted: 08/08/2023] [Indexed: 08/18/2023] Open
Abstract
OBJECTIVES Polyunsaturated fatty acids (PUFAs) are structural components of membrane phospholipids and precursors of oxygenated lipid mediators with diverse functions, including the control of cell growth, inflammation and tumourigenesis. However, the molecular pathways that control the availability of PUFAs for lipid mediator production are not well understood. Here, we investigated the crosstalk of three pathways in the provision of PUFAs for lipid mediator production: (i) secreted group X phospholipase A2 (GX sPLA2) and (ii) cytosolic group IVA PLA2 (cPLA2α), both mobilizing PUFAs from membrane phospholipids, and (iii) adipose triglyceride lipase (ATGL), which mediates the degradation of triacylglycerols (TAGs) stored in cytosolic lipid droplets (LDs). METHODS We combined lipidomic and functional analyses in cancer cell line models to dissect the trafficking of PUFAs between membrane phospholipids and LDs and determine the role of these pathways in lipid mediator production, cancer cell proliferation and tumour growth in vivo. RESULTS We demonstrate that lipid mediator production strongly depends on TAG turnover. GX sPLA2 directs ω-3 and ω-6 PUFAs from membrane phospholipids into TAG stores, whereas ATGL is required for their entry into lipid mediator biosynthetic pathways. ATGL controls the release of PUFAs from LD stores and their conversion into cyclooxygenase- and lipoxygenase-derived lipid mediators under conditions of nutrient sufficiency and during serum starvation. In starving cells, ATGL also promotes the incorporation of LD-derived PUFAs into phospholipids, representing substrates for cPLA2α. Furthermore, we demonstrate that the built-up of TAG stores by acyl-CoA:diacylglycerol acyltransferase 1 (DGAT1) is required for the production of mitogenic lipid signals that promote cancer cell proliferation and tumour growth. CONCLUSION This study shifts the paradigm of PLA2-driven lipid mediator signalling and identifies LDs as central lipid mediator production hubs. Targeting DGAT1-mediated LD biogenesis is a promising strategy to restrict lipid mediator production and tumour growth.
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Affiliation(s)
- Eva Jarc Jovičić
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Ljubljana, Slovenia; Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Anja Pucer Janež
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Ljubljana, Slovenia; Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Thomas O Eichmann
- Institute of Molecular Biosciences, University of Graz, Graz, Austria; Center for Explorative Lipidomics, BioTechMed-Graz, Graz, Austria
| | - Špela Koren
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Ljubljana, Slovenia; Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Vesna Brglez
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Ljubljana, Slovenia; Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Paul M Jordan
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich Schiller University Jena, Jena, Germany
| | - Jana Gerstmeier
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich Schiller University Jena, Jena, Germany
| | - Duško Lainšček
- Department of Synthetic Biology and Immunology, National Institute of Chemistry, Ljubljana, Slovenia; EN-FIST, Centre of Excellence, Ljubljana, Slovenia
| | - Anja Golob-Urbanc
- Department of Synthetic Biology and Immunology, National Institute of Chemistry, Ljubljana, Slovenia
| | - Roman Jerala
- Department of Synthetic Biology and Immunology, National Institute of Chemistry, Ljubljana, Slovenia; EN-FIST, Centre of Excellence, Ljubljana, Slovenia
| | - Gérard Lambeau
- Université Côte d'Azur (UCA), Centre National de la Recherche Scientifique (CNRS), Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), UMR7275, Valbonne Sophia Antipolis, France
| | - Oliver Werz
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich Schiller University Jena, Jena, Germany
| | - Robert Zimmermann
- Institute of Molecular Biosciences, University of Graz, Graz, Austria; BioTechMed-Graz, University of Graz, Graz, Austria
| | - Toni Petan
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Ljubljana, Slovenia.
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Selvaraj R, Zehnder SV, Watts R, Lian J, Das C, Nelson R, Lehner R. Preferential lipolysis of DGAT1 over DGAT2 generated triacylglycerol in Huh7 hepatocytes. Biochim Biophys Acta Mol Cell Biol Lipids 2023; 1868:159376. [PMID: 37516308 DOI: 10.1016/j.bbalip.2023.159376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 06/26/2023] [Accepted: 07/26/2023] [Indexed: 07/31/2023]
Abstract
Two distinct diacylglycerol acyltransferases (DGAT1 and DGAT2) catalyze the final committed step of triacylglycerol (TG) synthesis in hepatocytes. After its synthesis in the endoplasmic reticulum (ER) TG is either stored in cytosolic lipid droplets (LDs) or is assembled into very low-density lipoproteins in the ER lumen. TG stored in cytosolic LDs is hydrolyzed by adipose triglyceride lipase (ATGL) and the released fatty acids are converted to energy by oxidation in mitochondria. We hypothesized that targeting/association of ATGL to LDs would differ depending on whether the TG stores were generated through DGAT1 or DGAT2 activities. Individual inhibition of DGAT1 or DGAT2 in Huh7 hepatocytes incubated with oleic acid did not yield differences in TG accretion while combined inhibition of both DGATs completely prevented TG synthesis suggesting that either DGAT can efficiently esterify exogenously supplied fatty acid. DGAT2-made TG was stored in larger LDs, whereas TG formed by DGAT1 accumulated in smaller LDs. Inactivation of DGAT1 or DGAT2 did not alter expression (mRNA or protein) of ATGL, the ATGL activator ABHD5/CGI-58, or LD coat proteins PLIN2 or PLIN5, but inactivation of both DGATs increased PLIN2 abundance despite a dramatic reduction in the number of LDs. ATGL was found to preferentially target to LDs generated by DGAT1 and fatty acids released from TG in these LDs were also preferentially used for fatty acid oxidation. Combined inhibition of DGAT2 and ATGL resulted in larger LDs, suggesting that the smaller size of DGAT1-generated LDs is the result of increased lipolysis of TG in these LDs.
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Affiliation(s)
- Rajakumar Selvaraj
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Alberta, Canada; Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Alberta, Canada
| | - Sarah V Zehnder
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Alberta, Canada; Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Alberta, Canada
| | - Russell Watts
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Alberta, Canada; Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Alberta, Canada
| | - Jihong Lian
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Alberta, Canada; Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Alberta, Canada
| | - Chinmayee Das
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Alberta, Canada; Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Alberta, Canada
| | - Randal Nelson
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Alberta, Canada; Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Alberta, Canada
| | - Richard Lehner
- Group on Molecular and Cell Biology of Lipids, University of Alberta, Alberta, Canada; Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Alberta, Canada; Department of Cell Biology, Faculty of Medicine and Dentistry, University of Alberta, Alberta, Canada.
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5
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Linden MA, Burke SJ, Pirzadah HA, Huang TY, Batdorf HM, Mohammed WK, Jones KA, Ghosh S, Campagna SR, Collier JJ, Noland RC. Pharmacological inhibition of lipolysis prevents adverse metabolic outcomes during glucocorticoid administration. Mol Metab 2023; 74:101751. [PMID: 37295745 PMCID: PMC10300254 DOI: 10.1016/j.molmet.2023.101751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 06/01/2023] [Accepted: 06/06/2023] [Indexed: 06/12/2023] Open
Abstract
OBJECTIVE Glucocorticoids are one of the most commonly prescribed classes of anti-inflammatory drugs; however, chronic treatment promotes iatrogenic (drug-induced) diabetes. As part of their physiological role, glucocorticoids stimulate lipolysis to spare glucose. We hypothesized that persistent stimulation of lipolysis during glucocorticoid therapy plays a causative role in the development of iatrogenic diabetes. METHODS Male C57BL/6J mice were given 100 μg/mL corticosterone (Cort) in the drinking water for two weeks and were fed either normal chow (TekLad 8640) or the same diet supplemented with an adipose triglyceride lipase inhibitor (Atglistatin - 2 g/kg diet) to inhibit the first step of lipolysis. RESULTS Herein, we report for the first time that glucocorticoid administration promotes a unique state of substrate excess and energetic overload in skeletal muscle that primarily results from the rampant mobilization of endogenous fuels. Inhibiting lipolysis protected mice from Cort-induced gains in fat mass, excess ectopic lipid accrual, hyperinsulinemia, and hyperglycemia. The role lipolysis plays in Cort-mediated pathology appears to differ between tissues. Within skeletal muscle, Cort-induced lipolysis facilitated diversion of glucose-derived carbons toward the pentose phosphate and hexosamine biosynthesis pathways but contributed to <3% of the Cort-induced genomic adaptations. In contrast, Cort stimulation of lipolysis accounted for ∼35% of the genomic changes in the liver but had minimal impact on hepatic metabolites reported. CONCLUSIONS These data support the idea that activation of lipolysis plays a causal role in the progression toward iatrogenic diabetes during glucocorticoid therapy with differential impact on skeletal muscle and liver.
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Affiliation(s)
- Melissa A Linden
- Skeletal Muscle Metabolism Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA, 70808, USA; Department of Exercise and Health Sciences, University of Massachusetts-Boston, Boston, MA, 02125, USA.
| | - Susan J Burke
- Laboratory of Immunogenetics, Pennington Biomedical Research Center, Baton Rouge, LA, 70808, USA.
| | - Humza A Pirzadah
- Skeletal Muscle Metabolism Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA, 70808, USA.
| | - Tai-Yu Huang
- Skeletal Muscle Metabolism Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA, 70808, USA.
| | - Heidi M Batdorf
- Laboratory of Islet Biology and Inflammation, Pennington Biomedical Research Center, Baton Rouge, LA, 70808, USA.
| | - Walid K Mohammed
- Skeletal Muscle Metabolism Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA, 70808, USA.
| | - Katarina A Jones
- Biological and Small Molecule Mass Spectrometry Core, University of Tennessee, Knoxville, TN, 37916, USA.
| | - Sujoy Ghosh
- Laboratory of Computational Biology, Pennington Biomedical Research Center, Baton Rouge, LA, 70808, USA; Program in Cardiovascular and Metabolic Disorders and Center for Computational Biology, Duke-National University of Singapore Medical School, Singapore, 169857, Singapore.
| | - Shawn R Campagna
- Biological and Small Molecule Mass Spectrometry Core, University of Tennessee, Knoxville, TN, 37916, USA.
| | - J Jason Collier
- Laboratory of Islet Biology and Inflammation, Pennington Biomedical Research Center, Baton Rouge, LA, 70808, USA.
| | - Robert C Noland
- Skeletal Muscle Metabolism Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA, 70808, USA.
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Imi Y, Amano R, Kasahara N, Obana Y, Hosooka T. Nicotinamide mononucleotide induces lipolysis by regulating ATGL expression via the SIRT1-AMPK axis in adipocytes. Biochem Biophys Rep 2023; 34:101476. [PMID: 37144119 PMCID: PMC10151261 DOI: 10.1016/j.bbrep.2023.101476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 04/19/2023] [Accepted: 04/21/2023] [Indexed: 05/06/2023] Open
Abstract
Nicotinamide adenine dinucleotide (NAD+) -dependent protein deacetylase SIRT1 plays an important role in the regulation of metabolism. Although the administration of nicotinamide mononucleotide (NMN), a key NAD+ intermediate, has been shown to ameliorate metabolic disorders, such as insulin resistance and glucose intolerance, the direct effect of NMN on the regulation of lipid metabolism in adipocytes remains unclear. We here investigated the effect of NMN on lipid storage in 3T3-L1 differentiated adipocytes. Oil-red O staining showed that NMN treatment reduced lipid accumulation in these cells. NMN was found to enhance lipolysis in adipocytes since the concentration of glycerol in the media was increased by NMN treatment. Western blotting and real-time RT-PCR analysis revealed that adipose triglyceride lipase (ATGL) expression at both protein and mRNA level was increased with NMN treatment in 3T3-L1 adipocytes. Whereas NMN increased SIRT1 expression and AMPK activation, an AMPK inhibitor compound C restored the NMN-dependent upregulation of ATGL expression in these cells, suggesting that NMN upregulates ATGL expression through the SIRT1-AMPK axis. NMN administration significantly decreased subcutaneous fat mass in mice on a high-fat diet. We also found that adipocyte size in subcutaneous fat was decreased with NMN treatment. Consistent with the alteration of fat mass and adipocyte size, the ATGL expression in subcutaneous fat was slightly, albeit significantly, increased with NMN treatment. These results indicate that NMN suppresses subcutaneous fat mass in diet-induced obese mice, potentially in part via the upregulation of ATGL. Unexpectedly, the reduction in fat mass as well as ATGL upregulation with NMN treatment were not observed in epididymal fat, implying that the effects of NMN are site-specific in adipose tissue. Thus, these findings provide important insights into the mechanism of NMN/NAD+ in the regulation of metabolism.
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Kersten S. The impact of fasting on adipose tissue metabolism. Biochim Biophys Acta Mol Cell Biol Lipids 2023; 1868:159262. [PMID: 36521736 DOI: 10.1016/j.bbalip.2022.159262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 11/20/2022] [Accepted: 12/05/2022] [Indexed: 12/14/2022]
Abstract
Fasting and starvation were common occurrences during human evolution and accordingly have been an important environmental factor shaping human energy metabolism. Humans can tolerate fasting reasonably well through adaptative and well-orchestrated time-dependent changes in energy metabolism. Key features of the adaptive response to fasting are the breakdown of liver glycogen and muscle protein to produce glucose for the brain, as well as the gradual depletion of the fat stores, resulting in the release of glycerol and fatty acids into the bloodstream and the production of ketone bodies in the liver. In this paper, an overview is presented of our current understanding of the effects of fasting on adipose tissue metabolism. Fasting leads to reduced uptake of circulating triacylglycerols by adipocytes through inhibition of the activity of the rate-limiting enzyme lipoprotein lipase. In addition, fasting stimulates the degradation of stored triacylglycerols by activating the key enzyme adipose triglyceride lipase. The mechanisms underlying these events are discussed, with a special interest in insights gained from studies on humans. Furthermore, an overview is presented of the effects of fasting on other metabolic pathways in the adipose tissue, including fatty acid synthesis, glucose uptake, glyceroneogenesis, autophagy, and the endocrine function of adipose tissue.
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Affiliation(s)
- Sander Kersten
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition and Health, Wageningen University, the Netherlands.
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Hara Y, Ikeda Y, Kimura H, Shimamoto S, Ishikawa M, Kobayashi K, Nagasaka H, Shimoyama H, Hirano KI. A novel homozygous missense mutation in PNPLA2 in a patient manifesting primary triglyceride deposit cardiomyovasculopathy. Mol Genet Metab Rep 2023; 34:100960. [PMID: 36846631 PMCID: PMC9945797 DOI: 10.1016/j.ymgmr.2023.100960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/04/2023] [Accepted: 02/05/2023] [Indexed: 02/12/2023] Open
Abstract
Primary triglyceride deposit cardiomyovasculopathy (P-TGCV), caused by a rare genetic mutation in PNPLA2 encoding adipose triglyceride lipase (ATGL), exhibits severe cardiomyocyte steatosis and heart failure. Here, we report the case of a 51-year-old man with P-TGCV homozygous for a novel PNPLA2 mutation (c.446C > G, P149R) in the catalytic domain of ATGL. Analyses of endomyocardial biopsy specimens and in vitro expression experiments showed mutant protein expression with conserved lipid binding, but reduced lipolytic activity, indicating mutation pathogenicity.
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Key Words
- ATGL, adipose triglyceride lipase
- Adipose triglyceride lipase
- BMIPP, 123I-β-idophenyl-p-pentadecanoic acid
- CTx, cardiac transplantation
- HE, hematoxylin-eosin
- Heart failure
- Mutation
- NLSD, neutral lipid storage disease
- NLSD-I, NLSD with ichthyosis
- NLSD-M, NLSD with myopathy
- PCR, polymerase chain reaction
- PLIN2, perilipin-2
- PNPLA2
- TGCV, triglyceride deposit cardiomyovasculopathy
- Triglyceride deposit cardiomyovasculopathy
- WR, washout rate
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Affiliation(s)
- Yasuhiro Hara
- Laboratory of Novel, Non-invasive, and Nutritional Therapeutics (CNT), Department of Triglyceride Science, Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka 565-0874, Japan
| | - Yoshihiko Ikeda
- Laboratory of Novel, Non-invasive, and Nutritional Therapeutics (CNT), Department of Triglyceride Science, Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka 565-0874, Japan,Department of Pathology, National Cerebral and Cardiovascular Center, 6-1, Kishibeshinmachi, Suita, Osaka 564-8565, Japan
| | - Hayato Kimura
- Department of Pathology, Itami City Hospital, 1-100, Koyaike, Itami, Hyogo 664-8540, Japan
| | - Shinsaku Shimamoto
- Department of Cardiology, Itami City Hospital, 1-100, Koyaike, Itami, Hyogo 664-8540, Japan
| | - Mao Ishikawa
- Laboratory of Novel, Non-invasive, and Nutritional Therapeutics (CNT), Department of Triglyceride Science, Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka 565-0874, Japan
| | - Kunihisa Kobayashi
- Department of Endocrinology and Diabetes Mellitus, Fukuoka University Chikushi Hospital, 1-1-1, Zokumyoin, Chikushino, Fukuoka 818-8502, Japan
| | - Hironori Nagasaka
- Department of Pediatrics, Iwate Prefectural Isawa Hospital, 61, Aza Ryugababa, Mizusawa, Ohshu, Iwate 023-0864, Japan
| | - Hisashi Shimoyama
- Department of Cardiology, Itami City Hospital, 1-100, Koyaike, Itami, Hyogo 664-8540, Japan
| | - Ken-ichi Hirano
- Laboratory of Novel, Non-invasive, and Nutritional Therapeutics (CNT), Department of Triglyceride Science, Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka 565-0874, Japan,Corresponding author.
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9
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Zhang J, Li SL, Lin W, Pan RH, Dai Y, Xia YF. Tripterygium glycoside tablet attenuates renal function impairment in diabetic nephropathy mice by regulating triglyceride metabolism. J Pharm Biomed Anal 2022; 221:115028. [PMID: 36108463 DOI: 10.1016/j.jpba.2022.115028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 09/01/2022] [Accepted: 09/03/2022] [Indexed: 11/28/2022]
Abstract
Tripterygium glycoside tablet (TGT) has been used clinically to alleviate diabetic nephropathy (DN) for decades. However, the mechanism of its anti-DN has not been fully clarified. The aim of this study was to elucidate molecular mechanism of TGT in repairing renal function injury. The results of biochemical parameters and renal histopathology implied that TGT intervention could attenuate creatinine, albumin excretion rate and histological injury of kidney in DN mouse model. Moreover, UHPLC-QTOF-MS/MS-based untargeted metabolomic analysis indicated that 11 metabolites in kidney of mice with DN were restored after TGT treatment, and the most prominent metabolic alteration was triglyceride (TG) metabolism. Mechanistically, TGT effectively improved the function of impaired kidney by promoting TG catabolism via modulation of adipose triglyceride lipase in DN mice. Our findings identified the link between circulating metabolites and DN, suggesting that it might be a possibility to intervene in DN by targeting metabolism.
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Affiliation(s)
- Jing Zhang
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, 639 Longmian Avenue, Nanjing 211198, China
| | - Si-Lan Li
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, 639 Longmian Avenue, Nanjing 211198, China
| | - Wen Lin
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, 639 Longmian Avenue, Nanjing 211198, China
| | - Rong-Hua Pan
- The Chinese Traditional Medical Hospital of Liyang City, Liyang 213300, China
| | - Yue Dai
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, 639 Longmian Avenue, Nanjing 211198, China.
| | - Yu-Feng Xia
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, 639 Longmian Avenue, Nanjing 211198, China.
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10
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Riegler-Berket L, Wechselberger L, Cerk IK, Padmanabha Das KM, Viertlmayr R, Kulminskaya N, Rodriguez Gamez CF, Schweiger M, Zechner R, Zimmermann R, Oberer M. Residues of the minimal sequence of G0S2 collectively contribute to ATGL inhibition while C-and N-terminal extensions promote binding to ATGL. Biochim Biophys Acta Mol Cell Biol Lipids 2022; 1867:159105. [PMID: 35026402 DOI: 10.1016/j.bbalip.2021.159105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 11/29/2021] [Accepted: 12/17/2021] [Indexed: 11/25/2022]
Abstract
The protein encoded by the G0/G1 switch gene 2 (G0S2) is a potent inhibitor of adipose triglyceride lipase (ATGL) and thus an important regulator of intracellular lipolysis. Since dysfunction of lipolysis is associated with metabolic diseases including diabetes and obesity, inhibition of ATGL is considered a therapeutic strategy. G0S2 interacts with ATGL's patatin-domain to mediate non-competitive inhibition, however atomic details of the inhibition mechanism are incompletely understood. Sequences of G0S2 from higher organisms show a highly conserved N-terminal part, including a hydrophobic region covering amino acids 27 to 42. We show that predicted G0S2 orthologs from platypus, chicken and Japanese rice-fish are able to inhibit human and mouse ATGL, emphasizing the contribution of conserved amino acid to ATGL inhibition. Our site directed mutagenesis and truncation studies give insights in the protein-protein interaction on a per-residue level. We determine that the minimal sequence required for ATGL inhibition ranges from amino acids 20 to 44. Residues Y27, V28, G30, A34 G37, V39 or L42 within this sequence play a substantial role in ATGL inhibition. Furthermore, we show that unspecific interactions of the N-terminal part (amino acids 20-27) of the minimal sequence facilitate the interaction to ATGL. Our studies also demonstrate that full-length G0S2 shows higher tolerance to specific single amino acid exchanges in the hydrophobic region due to the stronger contributions of unspecific interactions. However, exchanges of more than one amino-acid in the hydrophobic region also result in the loss of function as ATGL inhibitor even in the full-length protein.
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Affiliation(s)
- L Riegler-Berket
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - L Wechselberger
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - I K Cerk
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - K M Padmanabha Das
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - R Viertlmayr
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - N Kulminskaya
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | | | - M Schweiger
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; BioTechMed Graz, 8010 Graz, Austria
| | - R Zechner
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; BioTechMed Graz, 8010 Graz, Austria; BioHealth Field of Excellence, University of Graz, 8010 Graz, Austria
| | - R Zimmermann
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; BioTechMed Graz, 8010 Graz, Austria; BioHealth Field of Excellence, University of Graz, 8010 Graz, Austria
| | - M Oberer
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; BioTechMed Graz, 8010 Graz, Austria; BioHealth Field of Excellence, University of Graz, 8010 Graz, Austria.
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11
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Yin L, Wang Y. Long non-coding RNA NEAT1 facilitates the growth, migration, and invasion of ovarian cancer cells via the let-7 g/MEST/ATGL axis. Cancer Cell Int 2021; 21:437. [PMID: 34416900 PMCID: PMC8379830 DOI: 10.1186/s12935-021-02018-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 06/10/2021] [Indexed: 12/14/2022] Open
Abstract
Background/Aim Growing evidence indicates a significant role of long non-coding RNA (lncRNA) nuclear-enriched abundant transcript 1 (NEAT1) in ovarian cancer, a frequently occurring malignant tumor in women; however, the possible effects of an interplay of NEAT1 with microRNA (miRNA or miR) let-7 g in ovarian cancer are not known. The current study aimed to investigate the role of the NEAT1/let-7 g axis in the growth, migration, and invasion of ovarian cancer cells and explore underlying mechanisms. Methods NEAT1 expression levels were examined in clinical tissue samples and cell lines. The relationships between NEAT1, let-7 g, and MEST were then analyzed. Gain- or loss-of-function approaches were used to manipulate NEAT1 and let-7 g. The effects of NEAT1 on cell proliferation, migration, invasion, and apoptosis were evaluated. Mouse xenograft models of ovarian cancer cells were established to verify the function of NEAT1 in vivo. Results NEAT1 expression was elevated while let-7 g was decreased in ovarian cancer clinical tissue samples and cell lines. A negative correlation existed between NEAT1 and let-7 g, whereby NEAT1 competitively bound to let-7 g and consequently down-regulate let-7 g expression. By this mechanism, the growth, migration, and invasion of ovarian cancer cells were stimulated. In addition, let-7 g targeted mesoderm specific transcript (MEST) and inhibited its expression, leading to promotion of adipose triglyceride lipase (ATGL) expression and inhibition of ovarian cancer cell growth, migration, and invasion. However, the effect of let-7 g was abolished by overexpression of MEST. Furthermore, silencing of NEAT1 decreased the xenograft tumor growth by decreasing MEST while up-regulating let-7 g and ATGL. Conclusions Cumulatively, the findings demonstrated that NEAT1 could promote malignant phenotypes of ovarian cancer cells by regulating the let-7 g/MEST/ATGL signaling axis. Therefore, NEAT1 can be regarded as an important molecular target and biomarker for ovarian cancer. Supplementary Information The online version contains supplementary material available at 10.1186/s12935-021-02018-3.
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Affiliation(s)
- Lili Yin
- Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, No. 36, Sanhao Street, Heping District, Shenyang, Liaoning Province, 110004, P.R. China
| | - Yu Wang
- Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, No. 36, Sanhao Street, Heping District, Shenyang, Liaoning Province, 110004, P.R. China.
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12
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Zareie R, Yuzbashian E, Rahimi H, Asghari G, Zarkesh M, Hedayati M, Djazayery A, Movahedi A, Mirmiran P, Khalaj A. Dietary fat content and adipose triglyceride lipase and hormone-sensitive lipase gene expressions in adults' subcutaneous and visceral fat tissues. Prostaglandins Leukot Essent Fatty Acids 2021; 165:102244. [PMID: 33445064 DOI: 10.1016/j.plefa.2021.102244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 12/30/2020] [Accepted: 01/06/2021] [Indexed: 10/22/2022]
Abstract
INTRODUCTION We examined the association of adipose triglyceride lipase (ATGL) and hormone-sensitive lipase (HSL) gene expressions, as the key regulators of lipolysis, with dietary fat quantity and composition in subcutaneous adipose tissue (SAT) and visceral adipose tissue (VAT). METHODS In this observational study, samples were collected from patients undergoing elective abdominal surgery. Participants were categorized into two groups based on their body mass index (BMI) status. Dietary, anthropometric, and biochemical data were collected before surgery. Linear regression was performed to determine the association of dietary fat content with ATGL and HSL gene expressions in SAT and VAT. RESULTS 152 individuals with a mean ± SD age of 40.7 ± 13.2 years and a median (inter-quartile range) BMI of 39.4 (26.5-45.3 kg/m2) participated in this study, of whom 54 were non-obese (BMI<30 kg/m2), and 98 were obese (BMI≥30 kg/m2). Among non-obese participants, positive associations were observed between ATGL mRNA expression and reported intakes of total fatty acids (TFA) (β=0.306, P = 0.025), myristic (β=0.285, P = 0.038), palmitic (β=0.417, P = 0.002), oleic (β=0.333, P = 0.017), dairy trans (β=0.374, P = 0.006), and other trans FAs (β=0.369, P = 0.006) in SAT. In contrast, inverse associations between HSL mRNA expression and reported intakes of TFAs (β=-0.377, P = 0.005), myristic (β=-0.282, P = 0.039), palmitic (β=-0.372, P = 0.006), stearic (β=-0.314, P = 0.020), and oleic acid (β=-0.372, P = 0.007) were observed in SAT. No associations were observed among obese participants, nor in VAT among non-obese individuals. CONCLUSION ATGL and HSL mRNA expressions in SAT were associated with dietary fat quantity and composition among non-obese adults.
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Affiliation(s)
- Rahim Zareie
- Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Emad Yuzbashian
- Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hamed Rahimi
- Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Golaleh Asghari
- Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Maryam Zarkesh
- Cellular and Molecular Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mehdi Hedayati
- Cellular and Molecular Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Abolghassem Djazayery
- Department of Nutrition, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Ariyo Movahedi
- Department of Nutrition, Science and Research Branch, Islamic Azad University, Tehran, Iran.
| | - Parvin Mirmiran
- Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Alireza Khalaj
- Obesity Treatment Center, Department of Surgery, Shahed University, Tehran, Iran
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13
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Li LF, Zhang Q, Zhang XY, Zhang JH, Feng YH, Lü YL, Jia JZ, Huang YS. [Effect and mechanism of cardiac adipose triglyceride lipase overexpression on burn-induced cardiac injury]. Zhonghua Yi Xue Za Zhi 2020; 100:910-914. [PMID: 32234165 DOI: 10.3760/cma.j.cn112137-20191203-02634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the effect and potential mechanism of cardiac adipose triglyceride lipase (ATGL) overexpression on burn-induced cardiac injury. Methods: Eight-week-old C57BL/6J mice with cardiac ATGL overexpression driven by the myosin heavy chain (MHC) promoter (MHC-ATGL burn group) and wild-type (wild-type burn group) mice were randomly chose to the following experiments with burn injury after 24 h (n=8/group), MHC-ATGL mice and wild-type mice with corresponded age and sex were included as control. Cardiac ATGL protein expression, serum levels of cardiac troponin T and cardiac kinase-MB (CK-MB), cardiac free fatty acid and reactive oxygen species were detected. The wild-type and MHC-ATGL burn groups were not only compared with their corresponded control groups, but also compared between each other. Results: The hair color and development were shown little difference between each group. ATGL protein expression is elevated in wild-type burn group (1.00±0.68 vs 3.09±0.93, P=0.023) and decreased in MHC-ATGL burn group (17.84±2.41 vs 10.36±2.22, P<0.001), while ATGL protein expression is still increased in MHC-ATGL burn group compared with wild-type burn group (P<0.001). Serum levels of cardiac troponin T and CK-MB were both elevated in wild-type burn group and MHC-ATGL burn group [(0.456±0.131) vs (0.076±0.019) μg/L and (0.219±0.089) vs (0.060±0.019) μg/L, (1 421±162) vs (221±67) U/L and (761±142) vs (221±41) U/L] (all P<0.001), while serum levels of cardiac troponin T and CK-MB was still decreased in MHC-ATGL burn group compared with wild-type burn group (P<0.001). In addition, cardiac free fatty acid was increased in wild-type burn group and little difference was found in MHC-ATGL burn group [(2.54±0.51) vs (0.46±0.27) mmol/L, P<0.001, and (0.81±0.38) vs (0.59±0.25) mmol/L, P=0.251], while cardiac free fatty acid was significant reduction in MHC-ATGL burn group compared with wild-type burn group (P<0.001). Levels of cardiac reactive oxygen species was both elevated in wild-type burn group and MHC-ATGL burn group [(1.89±0.23) vs (1.00±0.18) and (1.38±0.17) vs (0.95±0.13)] (both P<0.001), while levels of cardiac reactive oxygen was reduction in MHC-ATGL burn group compared with wild-type burn group (P<0.001). Conclusion: Cardiac ATGL overexpression may protect against burn-induced cardiac injury through reducing free fatty acid and reactive oxygen species production.
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Affiliation(s)
- L F Li
- Department of Dermatology, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing, 400042, China
| | - Q Zhang
- Institute of Burn Research, State Key Laboratory of Trauma, Burns and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - X Y Zhang
- Institute of Burn Research, State Key Laboratory of Trauma, Burns and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - J H Zhang
- Institute of Burn Research, State Key Laboratory of Trauma, Burns and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Y H Feng
- Institute of Burn Research, State Key Laboratory of Trauma, Burns and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Y L Lü
- Institute of Burn Research, State Key Laboratory of Trauma, Burns and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - J Z Jia
- Institute of Burn Research, State Key Laboratory of Trauma, Burns and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Y S Huang
- Institute of Burn Research, State Key Laboratory of Trauma, Burns and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
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14
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Li M, Hirano KI, Ikeda Y, Higashi M, Hashimoto C, Zhang B, Kozawa J, Sugimura K, Miyauchi H, Suzuki A, Hara Y, Takagi A, Ikeda Y, Kobayashi K, Futsukaichi Y, Zaima N, Yamaguchi S, Shrestha R, Nakamura H, Kawaguchi K, Sai E, Hui SP, Nakano Y, Sawamura A, Inaba T, Sakata Y, Yasui Y, Nagasawa Y, Kinugawa S, Shimada K, Yamada S, Hao H, Nakatani D, Ide T, Amano T, Naito H, Nagasaka H, Kobayashi K. Triglyceride deposit cardiomyovasculopathy: a rare cardiovascular disorder. Orphanet J Rare Dis 2019; 14:134. [PMID: 31186072 PMCID: PMC6560904 DOI: 10.1186/s13023-019-1087-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 05/01/2019] [Indexed: 12/25/2022] Open
Abstract
Triglyceride deposit cardiomyovasculopathy (TGCV) is a phenotype primarily reported in patients carrying genetic mutations in PNPLA2 encoding adipose triglyceride lipase (ATGL) which releases long chain fatty acid (LCFA) as a major energy source by the intracellular TG hydrolysis. These patients suffered from intractable heart failure requiring cardiac transplantation. Moreover, we identified TGCV patients without PNPLA2 mutations based on pathological and clinical studies. We provided the diagnostic criteria, in which TGCV with and without PNPLA2 mutations were designated as primary TGCV (P-TGCV) and idiopathic TGCV (I-TGCV), respectively. We hereby report clinical profiles of TGCV patients. Between 2014 and 2018, 7 P-TGCV and 18 I-TGCV Japanese patients have been registered in the International Registry. Patients with I-TGCV, of which etiologies and causes are not known yet, suffered from adult-onset severe heart disease, including heart failure and coronary artery disease, associated with a marked reduction in ATGL activity and myocardial washout rate of LCFA tracer, as similar to those with P-TGCV. The present first registry-based study showed that TGCV is an intractable, at least at the moment, and heterogeneous cardiovascular disorder.
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Affiliation(s)
- Ming Li
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics and Triglyceride Research Center (TGRC), Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka, 565-0874, Japan
| | - Ken-Ichi Hirano
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics and Triglyceride Research Center (TGRC), Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka, 565-0874, Japan.
| | - Yoshihiko Ikeda
- Department of Pathology, National Cerebral and Cardiovascular Center, 5-7-1, Fujishirodai, Suita, Osaka, 565-8565, Japan
| | - Masahiro Higashi
- Department of Radiology, National Hospital Organization Osaka National Hospital, 2-1-14, Hoenzaka, Chuo-ku, Osaka, 540-0006, Japan
| | - Chikako Hashimoto
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics and Triglyceride Research Center (TGRC), Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka, 565-0874, Japan
| | - Bo Zhang
- Department of Biochemistry, Fukuoka University Medical School, 7-45-1, Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Junji Kozawa
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Koichiro Sugimura
- Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, 1-1, Seiryomachi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan
| | - Hideyuki Miyauchi
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1, Inohara, Chuo-ku, Chiba, 260-8670, Japan
| | - Akira Suzuki
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics and Triglyceride Research Center (TGRC), Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka, 565-0874, Japan
| | - Yasuhiro Hara
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics and Triglyceride Research Center (TGRC), Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka, 565-0874, Japan
| | - Atsuko Takagi
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics and Triglyceride Research Center (TGRC), Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka, 565-0874, Japan
| | - Yasuyuki Ikeda
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics and Triglyceride Research Center (TGRC), Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka, 565-0874, Japan
| | - Kazuhiro Kobayashi
- Division of Molecular Brain Science, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan
| | - Yoshiaki Futsukaichi
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics and Triglyceride Research Center (TGRC), Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka, 565-0874, Japan
| | - Nobuhiro Zaima
- Department of Applied Biological Chemistry, Graduate School of Agriculture, Kindai University, 3327-204, Nakamachi, Nara, 631-8505, Japan
| | - Satoshi Yamaguchi
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics and Triglyceride Research Center (TGRC), Graduate School of Medicine, Osaka University, 6-2-4, Furuedai, Suita, Osaka, 565-0874, Japan
| | - Rojeet Shrestha
- Faculty of Health Sciences, Hokkaido University, Kita-12, Nishi-5, Sapporo, 060-0812, Japan
| | - Hiroshi Nakamura
- Kure Medical Center and Chugoku Cancer Center, National Hospital Organization, 3-1, Aoyama-cho, Kure, Hiroshima, 737-0023, Japan
| | - Katsuhiro Kawaguchi
- Department of Cardiovascular Medicine, Komaki City Hospital, 1-20, Jobushi, Komaki, Aichi, 485-8520, Japan
| | - Eiryu Sai
- Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo-ku, Tokyo, 113-8421, Japan
| | - Shu-Ping Hui
- Faculty of Health Sciences, Hokkaido University, Kita-12, Nishi-5, Sapporo, 060-0812, Japan
| | - Yusuke Nakano
- Department of Cardiology, Aichi Medical University, 1-1 Yazakokarimata, Nagakute, Aichi, 480-1195, Japan
| | - Akinori Sawamura
- Department of Cardiovascular Medicine, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi, 466-8560, Japan
| | - Tohru Inaba
- Department of Infection Control and Laboratory Medicine, Kyoto Prefectural University of Medicine, 465, Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan
| | - Yasuhiko Sakata
- Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, 1-1, Seiryomachi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan
| | - Yoko Yasui
- Faculty of Human Life Science, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Yasuyuki Nagasawa
- Department of Internal Medicine, Division of Kidney and Dialysis, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya, Hyogo, 663-8501, Japan
| | - Shintaro Kinugawa
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Kita-15, Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - Kazunori Shimada
- Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo-ku, Tokyo, 113-8421, Japan
| | - Sohsuke Yamada
- Department of Pathology and Laboratory Medicine, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa, 920-0293, Japan
| | - Hiroyuki Hao
- Department of Pathology, Nihon University School of Medicine, 30-1 Ohyaguchikami-cho, Itabashi-ku, Tokyo, 173-8610, Japan
| | - Daisaku Nakatani
- Center for Global Health, Department of Medical Innovation, Osaka University Hospital.4F Center of Medical Innovation and Translational Research, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine, 2-2 (A8) Yamadaoka Suita, Osaka, 565-0871, Japan
| | - Tomomi Ide
- Department of Cardiovascular Medicine, Graduate School of Medicine, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Tetsuya Amano
- Department of Cardiology, Aichi Medical University, 1-1 Yazakokarimata, Nagakute, Aichi, 480-1195, Japan
| | - Hiroaki Naito
- Department of Radiology, Nippon Life Hospital, 2-1-54, Enokojima, Nishi-ku, Osaka, 550-0006, Japan
| | - Hironori Nagasaka
- Department of Pediatrics, Takarazuka City Hospital, 4-5-1, Obama, Takarazuka, Hyogo, 665-0827, Japan
| | - Kunihisa Kobayashi
- Department of Endocrinology and Diabetes Mellitus, Fukuoka University Chikushi Hospital, 1-1-1, Zokumyoin, Chikushino, Fukuoka, 818-8502, Japan
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Huang KT, Lin CC, Tsai MC, Chen KD, Chiu KW. Pigment epithelium-derived factor in lipid metabolic disorders. Biomed J 2019; 41:102-108. [PMID: 29866598 PMCID: PMC6138776 DOI: 10.1016/j.bj.2018.02.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 01/29/2018] [Accepted: 02/13/2018] [Indexed: 01/10/2023] Open
Abstract
Pigment epithelium-derived factor (PEDF) is a secreted glycoprotein that has anti-angiogenic, anti-proliferative, neurotrophic and immunomodulatory properties. PEDF has recently emerged as a critical metabolic regulatory protein since the discovery of its modulatory activities in the lipolytic pathway by binding to adipose triglyceride lipase (ATGL). Despite being beneficial in maintaining the homeostasis of hepatic lipid accumulation, PEDF has been uncovered an unfavorable role associated with insulin resistance. The molecular events that connect these two apparent distinct observations have been controversial and remained largely unknown. Therefore in this short review, we attempt to summarize the current findings of PEDF regarding its lipid metabolic functions and provide perspectives in identifying PEDF as a potential therapeutic target in lipid disorders.
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Affiliation(s)
- Kuang-Tzu Huang
- Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan.
| | - Chih-Che Lin
- Liver Transplantation Center, Department of Surgery, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - Ming-Chao Tsai
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - Kuang-Den Chen
- Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - King-Wah Chiu
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
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16
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Jarc E, Eichmann TO, Zimmermann R, Petan T. Lipidomic data on lipid droplet triglyceride remodelling associated with protection of breast cancer cells from lipotoxic stress. Data Brief 2018; 18:234-240. [PMID: 29896513 PMCID: PMC5996238 DOI: 10.1016/j.dib.2018.03.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 01/29/2018] [Accepted: 03/06/2018] [Indexed: 10/25/2022] Open
Abstract
The data presented here is related to the research article entitled "Lipid droplets induced by secreted phospholipase A2 and unsaturated fatty acids protect breast cancer cells from nutrient and lipotoxic stress" by E. Jarc et al., Biochim. Biophys. Acta 1863 (2018) 247-265. Elevated uptake of unsaturated fatty acids and lipid droplet accumulation are characteristic of aggressive cancer cells and have been associated with the cellular stress response. The present study provides lipidomic data on the triacylglycerol (TAG) and phosphatidylcholine (PC) composition of MDA-MB-231 breast cancer cells exposed to docosahexaenoic acid (DHA; 22:6, ω-3). Datasets provide information on the changes in lipid composition induced by depletion of adipose triglyceride lipase (ATGL) and by exogenous addition of secreted phospholipase A2 (sPLA2) in DHA-treated cells. The presented alterations in lipid composition, mediated by targeting lipid droplet biogenesis and lipolysis, are associated with protection from lipotoxicity and allow further investigation into the role of lipid droplets in the resistance of cancer cells to lipotoxic stress.
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Affiliation(s)
- Eva Jarc
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia.,Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Thomas O Eichmann
- Institute of Molecular Biosciences, University of Graz, Graz, Austria.,Center for Explorative Lipidomics, BioTechMed-Graz, Graz, Austria
| | - Robert Zimmermann
- Institute of Molecular Biosciences, University of Graz, Graz, Austria.,BioTechMed-Graz, Graz, Austria
| | - Toni Petan
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
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Takagi A, Ikeda Y, Kobayashi K, Kobayashi K, Ikeda Y, Kozawa J, Miyauchi H, Li M, Hashimoto C, Hara Y, Yamaguchi S, Suzuki A, Toda T, Nagasaka H, Hirano KI. Newly developed selective immunoinactivation assay revealed reduction in adipose triglyceride lipase activity in peripheral leucocytes from patients with idiopathic triglyceride deposit cardiomyovasculopathy. Biochem Biophys Res Commun 2017; 495:646-651. [PMID: 29146190 DOI: 10.1016/j.bbrc.2017.11.070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 11/10/2017] [Indexed: 01/14/2023]
Abstract
Triglyceride deposit cardiomyovasculopathy (TGCV) is a rare and newly identified disease among patients requiring cardiac transplantation. TGCV is characterized by cardiomyocyte steatosis and triglyceride (TG)-deposit atherosclerosis, resulting from the abnormal intracellular metabolism of TG. TGCV is classified into primary and idiopathic types. Primary TGCV carries ultra-rare genetic mutations in the adipose triglyceride lipase (ATGL), a rate-liming enzyme that hydrolyzes intracellular TG in adipose and non-adipose tissues. Idiopathic TGCV, first identified among autopsied individuals with diabetes mellitus (DM) with severe heart diseases, shows no ATGL mutations and its causes and underlying mechanisms are still unknown. TGCV is difficult to diagnose in daily clinics, thereby demanding feasible diagnostic procedures. We aimed to develop an assay to measure ATGL activity using peripheral leucocytes. Human his6-ATGL was expressed in COS1 cells, purified to homogeneity, and used to raise a polyclonal antibody neutralizing TG-hydrolyzing activity of ATGL. We developed a selective immunoinactivation assay (SIIA) for the quantitation of ATGL activity in cell lysates of leucocytes by the antibody neutralizing ATGL activities. ATGL activity was measured in 13 idiopathic TGCV patients, with two patients with primary TGCV as the negative control. Healthy (non-DM) and DM controls without heart diseases were also subjected. The developed SIIA assay revealed significant reduction in ATGL activity in leucocytes from patients with idiopathic TGCV who did not carry ATGL mutations as compared with non-DM and DM controls. Thus, ATGL in leucocytes may be an important biomarker for the diagnosis of TGCV and our assay may provide insights into pathophysiology and elucidate the underlying mechanism of TGCV and related disorders.
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Affiliation(s)
- Atsuko Takagi
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan; Department of Molecular Pharmacology, National Cerebral and Cardiovascular Center Research Institute, 5-7-1, Fujishirodai, Suita, Osaka 565-8565, Japan
| | - Yasuyuki Ikeda
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan
| | - Kunihisa Kobayashi
- Department of Endocrinology and Diabetes Mellitus, Fukuoka University Chikushi Hospital, 1-1-1, Zokumyoin, Chikushino, Fukuoka 818-8502, Japan
| | - Kazuhiro Kobayashi
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Hyogo 650-0017, Japan
| | - Yoshihiko Ikeda
- Department of Pathology, National Cerebral and Cardiovascular Center, 5-7-1, Fujishirodai, Suita, Osaka 565-8565, Japan
| | - Junji Kozawa
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0872, Japan
| | - Hideyuki Miyauchi
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1, Inohana, Chuo-ku, Chiba 260-8670, Japan
| | - Ming Li
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan
| | - Chikako Hashimoto
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan
| | - Yasuhiro Hara
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan
| | - Satoshi Yamaguchi
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan
| | - Akira Suzuki
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan
| | - Tatsushi Toda
- Department of Neurology, Graduate School of Medicine and Faculty of Medicine, Tokyo University, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Hironori Nagasaka
- Department of Pediatrics, Takarazuka City Hospital, 4-5-1, Obama, Takarazuka, Hyogo 665-0827, Japan
| | - Ken-Ichi Hirano
- Laboratory of Cardiovascular Disease, Novel, Non-invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan.
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18
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Hosseinzadeh-Attar MJ, Mahdavi-Mazdeh M, Yaseri M, Zahed NS, Alipoor E. Comparative Assessment of Serum Adipokines Zinc-α2-glycoprotein and Adipose Triglyceride Lipase, and Cardiovascular Risk Factors Between Normal Weight and Obese Patients with Hemodialysis. Arch Med Res 2017; 48:459-466. [PMID: 29128140 DOI: 10.1016/j.arcmed.2017.10.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Accepted: 10/17/2017] [Indexed: 12/25/2022]
Abstract
BACKGROUND Little is known about the potential relationship of obesity, adipose tissue and novel adipokines with cardiometabolic risk factors in end-stage renal disease. Zinc-α2-glycoprotein (ZAG) and adipose triglyceride lipase (ATGL) are novel adipokines with proposed desirable effects on inflammation, and lipid and glucose metabolism. The aim of this study was to investigate serum concentrations of ZAG and ATGL, and the relationship of these adipokines with cardiovascular risk factors in normal weight (NW) and obese (OB) patients undergoing hemodialysis. METHODS Patients with regular hemodialysis including 44 normal weight (18.5<BMI<25 kg/m2) and 44 obese (BMI≥30 kg/m2) were enrolled. Serum lipid profile, high-sensitivity C-reactive protein (hsCRP) and nitric oxide metabolites along with ZAG and ATGL concentrations were assessed. RESULTS ZAG concentrations were significantly lower in OB compared to NW group (100 ± 34 vs. 106 ± 31 ng/ml; p = 0.007). No significant difference was observed in ATGL between the two groups. A significant inverse correlation between ZAG and HDL (r = ‒0.236, p = 0.048) and a marginal inverse correlation between ATGL and HDL (r = ‒0.211, p = 0.078) were observed in all patients. ZAG had positive correlations with triglyceride/HDL (r = 0.279, p = 0.019), cholesterol/HDL (r = 0.319, p = 0.007), and LDL/HDL (r = 0.26, p = 0.029) ratios. Among cardiovascular risk factors, only LDL/HDL ratio and hsCRP were significantly higher in OB patients (p = 0.009 and p = 0.038, respectively). CONCLUSIONS Serum concentrations of ZAG, but not ATGL, were significantly lower in the OB group. It appears that obesity overrides the role of hemodialysis in determining ZAG concentration. In contrast, uremic condition might overshadow the role of obesity in determining levels of traditional cardiovascular risk factors.
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Affiliation(s)
- Mohammad Javad Hosseinzadeh-Attar
- Department of Clinical Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran, Iran; Centre of Research Excellence in Translating Nutritional Science to Good Health, The University of Adelaide, Adelaide, Australia
| | - Mitra Mahdavi-Mazdeh
- Iranian Tissue Bank and Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Mehdi Yaseri
- Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Narges Sadat Zahed
- Department of Nephrology, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Elham Alipoor
- Department of Clinical Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran, Iran.
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19
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Sztalryd C, Brasaemle DL. The perilipin family of lipid droplet proteins: Gatekeepers of intracellular lipolysis. Biochim Biophys Acta Mol Cell Biol Lipids 2017; 1862:1221-1232. [PMID: 28754637 DOI: 10.1016/j.bbalip.2017.07.009] [Citation(s) in RCA: 304] [Impact Index Per Article: 43.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 07/18/2017] [Accepted: 07/19/2017] [Indexed: 12/21/2022]
Abstract
Lipid droplets in chordates are decorated by two or more members of the perilipin family of lipid droplet surface proteins. The perilipins sequester lipids by protecting lipid droplets from lipase action. Their relative expression and protective nature is adapted to the balance of lipid storage and utilization in specific cells. Most cells of the body have tiny lipid droplets with perilipins 2 and 3 at the surfaces, whereas specialized fat-storing cells with larger lipid droplets also express perilipins 1, 4, and/or 5. Perilipins 1, 2, and 5 modulate lipolysis by controlling the access of lipases and co-factors of lipases to substrate lipids stored within lipid droplets. Although perilipin 2 is relatively permissive to lipolysis, perilipins 1 and 5 have distinct control mechanisms that are altered by phosphorylation. Here we evaluate recent progress toward understanding functions of the perilipins with a focus on their role in regulating lipolysis and autophagy. This article is part of a Special Issue entitled: Recent Advances in Lipid Droplet Biology edited by Rosalind Coleman and Matthijs Hesselink.
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Affiliation(s)
- Carole Sztalryd
- Department of Medicine, Division of Endocrinology, School of Medicine, University of Maryland, Baltimore, MD, USA; Geriatric Research, Education, and Clinical Center, Baltimore Veterans Affairs Health Care Center, Baltimore, MD, USA.
| | - Dawn L Brasaemle
- Department of Nutritional Sciences and Center for Lipid Research, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA.
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20
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Watt MJ, Cheng Y. Triglyceride metabolism in exercising muscle. Biochim Biophys Acta Mol Cell Biol Lipids 2017; 1862:1250-1259. [PMID: 28652193 DOI: 10.1016/j.bbalip.2017.06.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 06/15/2017] [Accepted: 06/20/2017] [Indexed: 12/21/2022]
Abstract
Triglycerides are stored within lipid droplets in skeletal muscle and can be hydrolyzed to produce fatty acids for energy production through β-oxidation and oxidative phosphorylation. While there was some controversy regarding the quantitative importance of intramyocellular triglyceride (IMTG) as a metabolic substrate, recent advances in proton magnetic resonance spectroscopy and confocal microscopy support earlier tracer and biopsy studies demonstrating a substantial contribution of IMTG to energy production, particularly during moderate-intensity endurance exercise. This review provides an update on the understanding of IMTG utilization during exercise, with a focus on describing the key regulatory proteins that control IMTG breakdown and how these proteins respond to acute exercise and in the adaptation to exercise training. This article is part of a Special Issue entitled: Recent Advances in Lipid Droplet Biology edited by Rosalind Coleman and Matthijs Hesselink.
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Affiliation(s)
- Matthew J Watt
- Metabolic Disease and Obesity program, Biomedicine Discovery Institute, Monash University, Clayton, Victoria 3800, Australia; Department of Physiology, Monash University, Clayton, Victoria 3800, Australia.
| | - Yunsheng Cheng
- Metabolic Disease and Obesity program, Biomedicine Discovery Institute, Monash University, Clayton, Victoria 3800, Australia; Department of Physiology, Monash University, Clayton, Victoria 3800, Australia
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21
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Grace SA, Meeks MW, Chen Y, Cornwell M, Ding X, Hou P, Rutgers JK, Crawford SE, Lai JP. Adipose Triglyceride Lipase (ATGL) Expression Is Associated with Adiposity and Tumor Stromal Proliferation in Patients with Pancreatic Ductal Adenocarcinoma. Anticancer Res 2017; 37:699-703. [PMID: 28179319 DOI: 10.21873/anticanres.11366] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 12/12/2016] [Accepted: 12/16/2016] [Indexed: 02/08/2023]
Abstract
BACKGROUND Obesity is an established risk factor for the development of pancreatic ductal adenocarcinoma (PDAC). However, the pathophysiology of how increased adiposity increases the risk for PDAC has not been fully elucidated. Adipose triglyceride lipase (ATGL) is a lipase that catabolizes triglyceride hydrolysis and has been implicated in the development of breast cancer. We hypothesized that overweight patients with PDAC would demonstrate higher tumor ATGL expression compared to non-overweight patients with PDAC. MATERIALS AND METHODS Immunohistochemical analysis for ATGL expression was performed on PDAC tissues from 44 patients after Whipple procedure or distal pancreatectomy. Correlation of ATGL expression with clinicopathological features was evaluated. RESULTS A total of 23/44 (52.2%) PDACs showed low level ATGL immunoreactivity, while 21/44 (47.8%) showed a high level, with moderate to strong positive ATGL immunoreactivity in more than 50% of the tumor cells. Chi-squared testing revealed a statistically significant association between high ATGL expression and both BMI >25 kg/m2 (χ2=5.74, p=0.017) and increased tumor stroma (χ2=19.14, p<0.001). Chi-squared testing failed to reveal a statistically significant association when comparing ATGL expression by lymph node metastasis, histological grade, tumor size, patient age, patient sex and presence of fat invasion. CONCLUSION Our results suggest that increased ATGL expression is associated with increased adiposity and stromal proliferation in patients with PDAC, making it a possible key protein in how obesity increases the risk of PDAC.
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Affiliation(s)
- Shane A Grace
- Department of Pathology, Saint Louis University School of Medicine, Saint Louis, MO, U.S.A
| | - Marshall W Meeks
- Department of Pathology, Saint Louis University School of Medicine, Saint Louis, MO, U.S.A
| | - Yongxin Chen
- Department of Pathology, Saint Louis University School of Medicine, Saint Louis, MO, U.S.A
| | - Mona Cornwell
- Department of Pathology, Saint Louis University School of Medicine, Saint Louis, MO, U.S.A
| | - Xianzhong Ding
- Department of Pathology, Loyola University Medical Center, Maywood, IL, U.S.A
| | - Ping Hou
- Department of Pathology, Saint Louis University School of Medicine, Saint Louis, MO, U.S.A
| | - Joanne K Rutgers
- Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, U.S.A
| | - Susan E Crawford
- Department of Pathology, Saint Louis University School of Medicine, Saint Louis, MO, U.S.A
| | - Jin-Ping Lai
- Department of Pathology, Saint Louis University School of Medicine, Saint Louis, MO, U.S.A.
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22
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Affiliation(s)
- Hindrik Mulder
- Unit of Molecular Metabolism, Lund University Diabetes Centre, Malmö, Sweden.
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23
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Laurens C, Badin PM, Louche K, Mairal A, Tavernier G, Marette A, Tremblay A, Weisnagel SJ, Joanisse DR, Langin D, Bourlier V, Moro C. G0/G1 Switch Gene 2 controls adipose triglyceride lipase activity and lipid metabolism in skeletal muscle. Mol Metab 2016; 5:527-537. [PMID: 27408777 PMCID: PMC4921782 DOI: 10.1016/j.molmet.2016.04.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 04/12/2016] [Accepted: 04/13/2016] [Indexed: 12/27/2022] Open
Abstract
OBJECTIVE Recent data suggest that adipose triglyceride lipase (ATGL) plays a key role in providing energy substrate from triglyceride pools and that alterations of its expression/activity relate to metabolic disturbances in skeletal muscle. Yet little is known about its regulation. We here investigated the role of the protein G0/G1 Switch Gene 2 (G0S2), recently described as an inhibitor of ATGL in white adipose tissue, in the regulation of lipolysis and oxidative metabolism in skeletal muscle. METHODS We first examined G0S2 protein expression in relation to metabolic status and muscle characteristics in humans. We next overexpressed and knocked down G0S2 in human primary myotubes to assess its impact on ATGL activity, lipid turnover and oxidative metabolism, and further knocked down G0S2 in vivo in mouse skeletal muscle. RESULTS G0S2 protein is increased in skeletal muscle of endurance-trained individuals and correlates with markers of oxidative capacity and lipid content. Recombinant G0S2 protein inhibits ATGL activity by about 40% in lysates of mouse and human skeletal muscle. G0S2 overexpression augments (+49%, p < 0.05) while G0S2 knockdown strongly reduces (-68%, p < 0.001) triglyceride content in human primary myotubes and mouse skeletal muscle. We further show that G0S2 controls lipolysis and fatty acid oxidation in a strictly ATGL-dependent manner. These metabolic adaptations mediated by G0S2 are paralleled by concomitant changes in glucose metabolism through the modulation of Pyruvate Dehydrogenase Kinase 4 (PDK4) expression (5.4 fold, p < 0.001). Importantly, downregulation of G0S2 in vivo in mouse skeletal muscle recapitulates changes in lipid metabolism observed in vitro. CONCLUSION Collectively, these data indicate that G0S2 plays a key role in the regulation of skeletal muscle ATGL activity, lipid content and oxidative metabolism.
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Affiliation(s)
- Claire Laurens
- INSERM, UMR1048, Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; University of Toulouse, Paul Sabatier University, France
| | - Pierre-Marie Badin
- INSERM, UMR1048, Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; University of Toulouse, Paul Sabatier University, France
| | - Katie Louche
- INSERM, UMR1048, Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; University of Toulouse, Paul Sabatier University, France
| | - Aline Mairal
- INSERM, UMR1048, Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; University of Toulouse, Paul Sabatier University, France
| | - Geneviève Tavernier
- INSERM, UMR1048, Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; University of Toulouse, Paul Sabatier University, France
| | - André Marette
- Department of Medicine, Canada; Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec, Canada
| | - Angelo Tremblay
- Department of Kinesiology, Canada; Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec, Canada
| | | | - Denis R Joanisse
- Department of Kinesiology, Canada; Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec, Canada
| | - Dominique Langin
- INSERM, UMR1048, Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; University of Toulouse, Paul Sabatier University, France; Toulouse University Hospitals, Department of Clinical Biochemistry, Toulouse, France
| | - Virginie Bourlier
- INSERM, UMR1048, Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; University of Toulouse, Paul Sabatier University, France
| | - Cedric Moro
- INSERM, UMR1048, Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; University of Toulouse, Paul Sabatier University, France.
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Abstract
Adipose tissue is a major regulator of metabolism in health and disease. The prominent roles of adipose tissue are to sequester fatty acids in times of energy excess and to release fatty acids via the process of lipolysis during times of high-energy demand, such as exercise. The fatty acids released during lipolysis are utilized by skeletal muscle to produce adenosine triphosphate to prevent fatigue during prolonged exercise. Lipolysis is controlled by a complex interplay between neuro-humoral regulators, intracellular signaling networks, phosphorylation events involving protein kinase A, translocation of proteins within the cell, and protein-protein interactions. Herein, we describe in detail the cellular and molecular regulation of lipolysis and how these processes are altered by acute exercise. We also explore the processes that underpin adipocyte adaptation to endurance exercise training, with particular focus on epigenetic modifications, control by microRNAs and mitochondrial adaptations. Finally, we examine recent literature describing how exercise might influence the conversion of traditional white adipose tissue to high energy-consuming "brown-like" adipocytes and the implications that this has on whole-body energy balance.
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Affiliation(s)
- Thomas Tsiloulis
- Biology of Lipid Metabolism Laboratory, Department of Physiology, Monash University, Clayton, Victoria, Australia
| | - Matthew J Watt
- Biology of Lipid Metabolism Laboratory, Department of Physiology, Monash University, Clayton, Victoria, Australia.
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25
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Dichlberger A, Schlager S, Kovanen PT, Schneider WJ. Lipid droplets in activated mast cells - a significant source of triglyceride-derived arachidonic acid for eicosanoid production. Eur J Pharmacol 2015; 785:59-69. [PMID: 26164793 DOI: 10.1016/j.ejphar.2015.07.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 05/28/2015] [Accepted: 07/07/2015] [Indexed: 12/17/2022]
Abstract
Mast cells are potent effectors of immune reactions and key players in various inflammatory diseases such as atherosclerosis, asthma, and rheumatoid arthritis. The cellular defense response of mast cells represents a unique and powerful system, where external signals can trigger cell activation resulting in a stimulus-specific and highly coordinated release of a plethora of bioactive mediators. The arsenal of mediators encompasses preformed molecules stored in cytoplasmic secretory granules, as well as newly synthesized proteinaceous and lipid mediators. The release of mediators occurs in strict chronological order and requires proper coordination between the endomembrane system and various enzymatic machineries. For the generation of lipid mediators, cytoplasmic lipid droplets have been shown to function as a major intracellular pool of arachidonic acid, the precursor for eicosanoid biosynthesis. Recent studies have revealed that not only phospholipids in mast cell membranes, but also triglycerides in mast cell lipid droplets are a substrate source for eicosanoid formation. The present review summarizes current knowledge about mast cell lipid droplet biology, and discusses expansions and challenges of traditional mechanistic models for eicosanoid production.
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Affiliation(s)
- Andrea Dichlberger
- Wihuri Research Institute, Biomedicum Helsinki 1, Haartmaninkatu 8, 00290 Helsinki, Finland; Medical University of Vienna, Max F. Perutz Laboratories, Department of Medical Biochemistry, Dr. Bohrgasse 9/2, 1030 Vienna, Austria.
| | - Stefanie Schlager
- Medical University of Graz, Institute of Molecular Biology and Biochemistry, Harrachgasse 21, 8010 Graz, Austria; Medical University of Vienna, Max F. Perutz Laboratories, Department of Medical Biochemistry, Dr. Bohrgasse 9/2, 1030 Vienna, Austria
| | - Petri T Kovanen
- Wihuri Research Institute, Biomedicum Helsinki 1, Haartmaninkatu 8, 00290 Helsinki, Finland; Medical University of Vienna, Max F. Perutz Laboratories, Department of Medical Biochemistry, Dr. Bohrgasse 9/2, 1030 Vienna, Austria
| | - Wolfgang J Schneider
- Wihuri Research Institute, Biomedicum Helsinki 1, Haartmaninkatu 8, 00290 Helsinki, Finland; Medical University of Graz, Institute of Molecular Biology and Biochemistry, Harrachgasse 21, 8010 Graz, Austria; Medical University of Vienna, Max F. Perutz Laboratories, Department of Medical Biochemistry, Dr. Bohrgasse 9/2, 1030 Vienna, Austria
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Goeritzer M, Vujic N, Schlager S, Chandak PG, Korbelius M, Gottschalk B, Leopold C, Obrowsky S, Rainer S, Doddapattar P, Aflaki E, Wegscheider M, Sachdev V, Graier WF, Kolb D, Radovic B, Kratky D. Active autophagy but not lipophagy in macrophages with defective lipolysis. Biochim Biophys Acta Mol Cell Biol Lipids 2015; 1851:1304-1316. [PMID: 26143381 PMCID: PMC4562370 DOI: 10.1016/j.bbalip.2015.06.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 05/29/2015] [Accepted: 06/20/2015] [Indexed: 11/30/2022]
Abstract
During autophagy, autophagosomes fuse with lysosomes to degrade damaged organelles and misfolded proteins. Breakdown products are released into the cytosol and contribute to energy and metabolic building block supply, especially during starvation. Lipophagy has been defined as the autophagy-mediated degradation of lipid droplets (LDs) by lysosomal acid lipase. Adipose triglyceride lipase (ATGL) is the major enzyme catalyzing the initial step of lipolysis by hydrolyzing triglycerides (TGs) in cytosolic LDs. Consequently, most organs and cells, including macrophages, lacking ATGL accumulate TGs, resulting in reduced intracellular free fatty acid concentrations. Macrophages deficient in hormone-sensitive lipase (H0) lack TG accumulation albeit reduced in vitro TG hydrolase activity. We hypothesized that autophagy is activated in lipase-deficient macrophages to counteract their energy deficit. We therefore generated mice lacking both ATGL and HSL (A0H0). Macrophages from A0H0 mice showed 73% reduced neutral TG hydrolase activity, resulting in TG-rich LD accumulation. Increased expression of cathepsin B, accumulation of LC3-II, reduced expression of p62 and increased DQ-BSA dequenching suggest intact autophagy and functional lysosomes in A0H0 macrophages. Markedly decreased acid TG hydrolase activity and lipid flux independent of bafilomycin A1 treatment, however, argue against effective lysosomal degradation of LDs in A0H0 macrophages. We conclude that autophagy of proteins and cell organelles but not of LDs is active as a compensatory mechanism to circumvent and balance the reduced availability of energy substrates in A0H0 macrophages.
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Affiliation(s)
- Madeleine Goeritzer
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Nemanja Vujic
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Stefanie Schlager
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Prakash G Chandak
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Melanie Korbelius
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Benjamin Gottschalk
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Christina Leopold
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Sascha Obrowsky
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Silvia Rainer
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Prakash Doddapattar
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Elma Aflaki
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Martin Wegscheider
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Vinay Sachdev
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Wolfgang F Graier
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Dagmar Kolb
- Center for Medical Research/Institute of Cell Biology, Histology and Embryology, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Branislav Radovic
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Dagmar Kratky
- Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
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Ogasawara J, Izawa T, Sakurai T, Shirato K, Ishibashi Y, Ohira Y, Ishida H, Ohno H, Kizaki T. Habitual exercise training acts as a physiological stimulator for constant activation of lipolytic enzymes in rat primary white adipocytes. Biochem Biophys Res Commun 2015; 464:348-53. [PMID: 26141235 DOI: 10.1016/j.bbrc.2015.06.157] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 06/24/2015] [Indexed: 01/15/2023]
Abstract
It is widely accepted that lipolysis in adipocytes are regulated through the enzymatic activation of both hormone-sensitive lipase (HSL) and adipose triglyceride lipase (ATGL) via their phosphorylation events. Accumulated evidence shows that habitual exercise training (HE) enhances the lipolytic response in primary white adipocytes with changes in the subcellular localization of lipolytic molecules. However, no study has focused on the effect that HE exerts on the phosphorylation of both HSL and ATGL in primary white adipocytes. It has been shown that the translocation of HSL from the cytosol to lipid droplet surfaces requires its phosphorylation at Ser-563. In primary white adipocytes obtained from HE rats, the level of HSL and ATGL proteins was higher than that in primary white adipocytes obtained from sedentary control (SC) rats. In HE rats, the level of phosphorylated ATGL and HSL was also significantly elevated compared with that in SC rats. These differences were confirmed by Phos-tag SDS-PAGE, a technique used to measure the amount of total phosphorylated proteins. Our results suggest that HE can consistently increase the activity of both lipases, thereby enhancing the lipolysis in white fat cells. Thus, HE helps in the prevention and treatment of obesity-related diseases by enhancing the lipolytic capacity.
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Affiliation(s)
- Junetsu Ogasawara
- Department of Molecular Predictive Medicine and Sport Science, Kyorin University, School of Medicine, Mitaka, Tokyo 181-8611, Japan.
| | - Tetsuya Izawa
- Graduate School of Health and Sports Sciences, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan
| | - Takuya Sakurai
- Department of Molecular Predictive Medicine and Sport Science, Kyorin University, School of Medicine, Mitaka, Tokyo 181-8611, Japan
| | - Ken Shirato
- Department of Molecular Predictive Medicine and Sport Science, Kyorin University, School of Medicine, Mitaka, Tokyo 181-8611, Japan
| | - Yoshinaga Ishibashi
- Department of Molecular Predictive Medicine and Sport Science, Kyorin University, School of Medicine, Mitaka, Tokyo 181-8611, Japan
| | - Yoshinobu Ohira
- Graduate School of Health and Sports Sciences, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan
| | - Hitoshi Ishida
- Department of Third Internal Medicine, Kyorin University, School of Medicine, Mitaka, Tokyo 181-8611, Japan
| | - Hideki Ohno
- Department of Molecular Predictive Medicine and Sport Science, Kyorin University, School of Medicine, Mitaka, Tokyo 181-8611, Japan
| | - Takako Kizaki
- Department of Molecular Predictive Medicine and Sport Science, Kyorin University, School of Medicine, Mitaka, Tokyo 181-8611, Japan
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28
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Higashi M, Hirano K, Kobayashi K, Ikeda Y, Issiki A, Otsuka T, Suzuki A, Yamaguchi S, Zaima N, Hamada S, Hanada H, Suzuki C, Nakamura H, Nagasaka H, Miyata T, Miyamoto Y, Kobayashi K, Naito H, Toda T. Distinct cardiac phenotype between two homozygotes born in a village with accumulation of a genetic deficiency of adipose triglyceride lipase. Int J Cardiol 2015; 192:30-2. [PMID: 25985012 DOI: 10.1016/j.ijcard.2015.05.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 05/02/2015] [Indexed: 01/28/2023]
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29
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Mayer N, Schweiger M, Melcher MC, Fledelius C, Zechner R, Zimmermann R, Breinbauer R. Structure-activity studies in the development of a hydrazone based inhibitor of adipose-triglyceride lipase (ATGL). Bioorg Med Chem 2015; 23:2904-16. [PMID: 25778769 PMCID: PMC4457358 DOI: 10.1016/j.bmc.2015.02.051] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 02/24/2015] [Accepted: 02/25/2015] [Indexed: 11/07/2022]
Abstract
Adipose triglyceride lipase (ATGL) catalyzes the degradation of cellular triacylglycerol stores and strongly determines the concentration of circulating fatty acids (FAs). High serum FA levels are causally linked to the development of insulin resistance and impaired glucose tolerance, which eventually progresses to overt type 2 diabetes. ATGL-specific inhibitors could be used to lower circulating FAs, which can counteract the development of insulin resistance. In this article, we report about structure–activity relationship (SAR) studies of small molecule inhibitors of ATGL based on a hydrazone chemotype. The SAR indicated that the binding pocket of ATGL requests rather linear compounds without bulky substituents. The best inhibitor showed an IC50 = 10 μM in an assay with COS7-cell lysate overexpressing murine ATGL.
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Affiliation(s)
- Nicole Mayer
- Institute of Organic Chemistry, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
| | - Martina Schweiger
- Institute of Molecular Biosciences, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria
| | | | | | - Rudolf Zechner
- Institute of Molecular Biosciences, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria
| | - Robert Zimmermann
- Institute of Molecular Biosciences, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria.
| | - Rolf Breinbauer
- Institute of Organic Chemistry, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria.
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30
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Taschler U, Schreiber R, Chitraju C, Grabner GF, Romauch M, Wolinski H, Haemmerle G, Breinbauer R, Zechner R, Lass A, Zimmermann R. Adipose triglyceride lipase is involved in the mobilization of triglyceride and retinoid stores of hepatic stellate cells. Biochim Biophys Acta Mol Cell Biol Lipids 2015; 1851:937-45. [PMID: 25732851 PMCID: PMC4408194 DOI: 10.1016/j.bbalip.2015.02.017] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 02/05/2015] [Accepted: 02/22/2015] [Indexed: 01/04/2023]
Abstract
Hepatic stellate cells (HSCs) store triglycerides (TGs) and retinyl ester (RE) in cytosolic lipid droplets. RE stores are degraded following retinoid starvation or in response to pathogenic stimuli resulting in HSC activation. At present, the major enzymes catalyzing lipid degradation in HSCs are unknown. In this study, we investigated whether adipose triglyceride lipase (ATGL) is involved in RE catabolism of HSCs. Additionally, we compared the effects of ATGL deficiency and hormone-sensitive lipase (HSL) deficiency, a known RE hydrolase (REH), on RE stores in liver and adipose tissue. We show that ATGL degrades RE even in the presence of TGs, implicating that these substrates compete for ATGL binding. REH activity was stimulated and inhibited by comparative gene identification-58 and G0/G1 switch gene-2, respectively, the physiological regulators of ATGL activity. In cultured primary murine HSCs, pharmacological inhibition of ATGL, but not HSL, increased RE accumulation. In mice globally lacking ATGL or HSL, RE contents in white adipose tissue were decreased or increased, respectively, while plasma retinol and liver RE levels remained unchanged. In conclusion, our study shows that ATGL acts as REH in HSCs promoting the degradation of RE stores in addition to its established function as TG lipase. HSL is the predominant REH in adipocytes but does not affect lipid mobilization in HSCs. ATGL possesses retinyl ester and triacylglycerol hydrolase activity. The lack of ATGL activity causes increased triacylglycerol and retinyl ester storage in hepatic stellate cells. ATGL acts as retinyl ester and triacylglycerol lipase in hepatic stellate cells.
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Affiliation(s)
- Ulrike Taschler
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | - Renate Schreiber
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | | | - Gernot F Grabner
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | - Matthias Romauch
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | - Heimo Wolinski
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | - Guenter Haemmerle
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | - Rolf Breinbauer
- Institute of Organic Chemistry, Graz University of Technology, Graz 8010, Austria
| | - Rudolf Zechner
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | - Achim Lass
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria.
| | - Robert Zimmermann
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria.
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31
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Gao H, Feng XJ, Li ZM, Li M, Gao S, He YH, Wang JJ, Zeng SY, Liu XP, Huang XY, Chen SR, Liu PQ. Downregulation of adipose triglyceride lipase promotes cardiomyocyte hypertrophy by triggering the accumulation of ceramides. Arch Biochem Biophys 2014; 565:76-88. [PMID: 25436917 DOI: 10.1016/j.abb.2014.11.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 11/14/2014] [Accepted: 11/20/2014] [Indexed: 12/31/2022]
Abstract
Adipose triglyceride lipase (ATGL), the rate-limiting enzyme of triglyceride (TG) hydrolysis, plays an important role in TG metabolism. ATGL knockout mice suffer from TG accumulation and die from heart failure. However, the mechanisms underlying cardiac hypertrophy caused by ATGL dysfunction remain unknown. In this study, we found that ATGL expression declined in pressure overload-induced cardiac hypertrophy in vivo and phenylephrine (PE)-induced cardiomyocyte hypertrophy in vitro. ATGL knockdown led to cardiomyocyte hypertrophy, while ATGL overexpression prevented PE-induced hypertrophy. In addition, ATGL downregulation increased but ATGL overexpression reduced the contents of ceramide, which has been proved to be closely associated with cardiac hypertrophy. Moreover, the accumulation of ceramide was due to elevation of free fatty acids in ATGL-knockdown cardiomyocytes, which could be explained by the reduced activity of peroxisome proliferator-activated receptor (PPAR) α leading to imbalance of fatty acid uptake and oxidation. These observations suggest that downregulation of ATGL causes the decreased PPARα activity which results in the imbalance of FA uptake and oxidation, elevating intracellular FFA contents to promote the accumulation of ceramides, and finally inducing cardiac hypertrophy. Upregulation of ATGL could be a strategy for ameliorating lipotoxic damage in cardiac hypertrophy.
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Affiliation(s)
- Hui Gao
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China; Department of Pharmacology, School of Medicine, Jishou University, Jishou, PR China
| | - Xiao-jun Feng
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China
| | - Zhuo-ming Li
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China
| | - Min Li
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China
| | - Si Gao
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China
| | - Yan-hong He
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China
| | - Jiao-jiao Wang
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China
| | - Si-yu Zeng
- Pharmaceutical Department, The Second's People Hospital of Guangdong Province, Guangzhou, PR China
| | - Xue-ping Liu
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China
| | - Xiao-yang Huang
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China
| | - Shao-rui Chen
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China.
| | - Pei-qing Liu
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, PR China.
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32
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Mussbacher M, Stessel H, Wölkart G, Haemmerle G, Zechner R, Mayer B, Schrammel A. Role of the ubiquitin-proteasome system in cardiac dysfunction of adipose triglyceride lipase-deficient mice. J Mol Cell Cardiol 2014; 77:11-9. [PMID: 25285770 PMCID: PMC4263609 DOI: 10.1016/j.yjmcc.2014.09.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 09/25/2014] [Accepted: 09/26/2014] [Indexed: 12/12/2022]
Abstract
Systemic deletion of the gene encoding for adipose triglyceride lipase (ATGL) in mice leads to severe cardiac dysfunction due to massive accumulation of neutral lipids in cardiomyocytes. Recently, impaired peroxisome proliferator-activated receptor α (PPARα) signaling has been described to substantially contribute to the observed cardiac phenotype. Disturbances of the ubiquitin-proteasome system (UPS) have been implicated in numerous cardiac diseases including cardiomyopathy, ischemic heart disease, and heart failure. The objective of the present study was to investigate the potential role of UPS in cardiac ATGL deficiency. Our results demonstrate prominent accumulation of ubiquitinated proteins in hearts of ATGL-deficient mice, an effect that was abolished upon cardiomyocyte-directed overexpression of ATGL. In parallel, cardiac protein expression of the ubiquitin-activating enzyme E1a, which catalyzes the first step of the ubiquitination cascade, was significantly upregulated in ATGL-deficient hearts. Dysfunction of the UPS was accompanied by activation of NF-κB signaling. Moreover, the endoplasmic reticulum (ER)-resident chaperon protein disulfide isomerase was significantly upregulated in ATGL-deficient hearts. Chronic treatment of ATGL-deficient mice with the PPARα agonist Wy14,643 improved proteasomal function, prevented NF-κB activation and decreased oxidative stress. In summary, our data point to a hitherto unrecognized link between proteasomal function, PPARα signaling and cardiovascular disease.
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Affiliation(s)
- Marion Mussbacher
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, A-8010 Graz, Austria.
| | - Heike Stessel
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, A-8010 Graz, Austria.
| | - Gerald Wölkart
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, A-8010 Graz, Austria.
| | - Guenter Haemmerle
- Department of Molecular Biosciences, University of Graz, Heinrichstrasse 31, A-8010 Graz, Austria.
| | - Rudolf Zechner
- Department of Molecular Biosciences, University of Graz, Heinrichstrasse 31, A-8010 Graz, Austria.
| | - Bernd Mayer
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, A-8010 Graz, Austria.
| | - Astrid Schrammel
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, A-8010 Graz, Austria.
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33
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Schrammel A, Mussbacher M, Wölkart G, Stessel H, Pail K, Winkler S, Schweiger M, Haemmerle G, Al Zoughbi W, Höfler G, Lametschwandtner A, Zechner R, Mayer B. Endothelial dysfunction in adipose triglyceride lipase deficiency. Biochim Biophys Acta 2014; 1841:906-17. [PMID: 24657704 PMCID: PMC4000266 DOI: 10.1016/j.bbalip.2014.03.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 02/27/2014] [Accepted: 03/13/2014] [Indexed: 12/31/2022]
Abstract
Systemic knockout of adipose triglyceride lipase (ATGL), the pivotal enzyme of triglyceride lipolysis, results in a murine phenotype that is characterized by progredient cardiac steatosis and severe heart failure. Since cardiac and vascular dysfunction have been closely related in numerous studies we investigated endothelium-dependent and -independent vessel function of ATGL knockout mice. Aortic relaxation studies and Langendorff perfusion experiments of isolated hearts showed that ATGL knockout mice suffer from pronounced micro- and macrovascular endothelial dysfunction. Experiments with agonists directly targeting vascular smooth muscle cells revealed the functional integrity of the smooth muscle cell layer. Loss of vascular reactivity was restored ~50% upon treatment of ATGL knockout mice with the PPARα agonist Wy14,643, indicating that this phenomenon is partly a consequence of impaired cardiac contractility. Biochemical analysis revealed that aortic endothelial NO synthase expression and activity were significantly reduced in ATGL deficiency. Enzyme activity was fully restored in ATGL mice treated with the PPARα agonist. Biochemical analysis of perivascular adipose tissue demonstrated that ATGL knockout mice suffer from perivascular inflammatory oxidative stress which occurs independent of cardiac dysfunction and might contribute to vascular defects. Our results reveal a hitherto unrecognized link between disturbed lipid metabolism, obesity and cardiovascular disease.
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Affiliation(s)
- Astrid Schrammel
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria.
| | - Marion Mussbacher
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria.
| | - Gerald Wölkart
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria.
| | - Heike Stessel
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria.
| | - Karoline Pail
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria.
| | - Sarah Winkler
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria.
| | - Martina Schweiger
- Department of Molecular Biosciences, University of Graz, Heinrichstrasse 31, 8010 Graz, Austria.
| | - Guenter Haemmerle
- Department of Molecular Biosciences, University of Graz, Heinrichstrasse 31, 8010 Graz, Austria.
| | - Wael Al Zoughbi
- Institute of Pathology, Medical University of Graz, Auenbruggerplatz 25, 8010 Graz, Austria.
| | - Gerald Höfler
- Institute of Pathology, Medical University of Graz, Auenbruggerplatz 25, 8010 Graz, Austria.
| | - Alois Lametschwandtner
- Department of Cell Biology and Physiology, Vessel and Muscle Research Unit, University of Salzburg, Hellbrunnerstrasse 34, 5020 Salzburg, Austria.
| | - Rudolf Zechner
- Department of Molecular Biosciences, University of Graz, Heinrichstrasse 31, 8010 Graz, Austria.
| | - Bernd Mayer
- Department of Pharmacology and Toxicology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria.
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34
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Nagy HM, Paar M, Heier C, Moustafa T, Hofer P, Haemmerle G, Lass A, Zechner R, Oberer M, Zimmermann R. Adipose triglyceride lipase activity is inhibited by long-chain acyl-coenzyme A. Biochim Biophys Acta Mol Cell Biol Lipids 2014; 1841:588-94. [PMID: 24440819 PMCID: PMC3988850 DOI: 10.1016/j.bbalip.2014.01.005] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 12/20/2013] [Accepted: 01/06/2014] [Indexed: 12/28/2022]
Abstract
Adipose triglyceride lipase (ATGL) is required for efficient mobilization of triglyceride (TG) stores in adipose tissue and non-adipose tissues. Therefore, ATGL strongly determines the availability of fatty acids for metabolic reactions. ATGL activity is regulated by a complex network of lipolytic and anti-lipolytic hormones. These signals control enzyme expression and the interaction of ATGL with the regulatory proteins CGI-58 and G0S2. Up to date, it was unknown whether ATGL activity is also controlled by lipid intermediates generated during lipolysis. Here we show that ATGL activity is inhibited by long-chain acyl-CoAs in a non-competitive manner, similar as previously shown for hormone-sensitive lipase (HSL), the rate-limiting enzyme for diglyceride breakdown in adipose tissue. ATGL activity is only marginally inhibited by medium-chain acyl-CoAs, diglycerides, monoglycerides, and free fatty acids. Immunoprecipitation assays revealed that acyl-CoAs do not disrupt the protein–protein interaction of ATGL and its co-activator CGI-58. Furthermore, inhibition of ATGL is independent of the presence of CGI-58 and occurs directly at the N-terminal patatin-like phospholipase domain of the enzyme. In conclusion, our results suggest that inhibition of the major lipolytic enzymes ATGL and HSL by long-chain acyl-CoAs could represent an effective feedback mechanism controlling lipolysis and protecting cells from lipotoxic concentrations of fatty acids and fatty acid-derived lipid metabolites. Long-chain acyl-CoAs inhibit ATGL in a non-competitive manner. Inhibition occurs at the N-terminal region of ATGL and independent of CGI-58, the co-activator of ATGL. Acyl-CoA mediated inhibition of lipolysis could represent a general feedback mechanism protecting cells from fatty acid overload.
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Affiliation(s)
- Harald M Nagy
- Institute of Molecular Biosciences, University of Graz, Austria
| | - Margret Paar
- Institute of Molecular Biosciences, University of Graz, Austria
| | - Christoph Heier
- Institute of Molecular Biosciences, University of Graz, Austria
| | - Tarek Moustafa
- Institute of Molecular Biosciences, University of Graz, Austria
| | - Peter Hofer
- Institute of Molecular Biosciences, University of Graz, Austria
| | | | - Achim Lass
- Institute of Molecular Biosciences, University of Graz, Austria
| | - Rudolf Zechner
- Institute of Molecular Biosciences, University of Graz, Austria
| | - Monika Oberer
- Institute of Molecular Biosciences, University of Graz, Austria
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35
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Kratky D, Obrowsky S, Kolb D, Radovic B. Pleiotropic regulation of mitochondrial function by adipose triglyceride lipase-mediated lipolysis. Biochimie 2014; 96:106-12. [PMID: 23827855 PMCID: PMC3859496 DOI: 10.1016/j.biochi.2013.06.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Accepted: 06/20/2013] [Indexed: 12/12/2022]
Abstract
Lipolysis is defined as the catabolism of triacylglycerols (TGs) stored in cellular lipid droplets. Recent discoveries of essential lipolytic enzymes and characterization of numerous regulatory proteins and mechanisms have fundamentally changed our perception of lipolysis and its impact on cellular metabolism. Adipose triglyceride lipase (ATGL) is the rate-limiting enzyme for TG catabolism in most cells and tissues. This review focuses on recent advances in understanding the (patho)physiological impact due to defective lipolysis by ATGL deficiency on mitochondrial (dys)function. Depending on the type of cells and tissues investigated, absence of ATGL has pleiotropic roles in mitochondrial function.
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Affiliation(s)
- Dagmar Kratky
- Institute of Molecular Biology and Biochemistry, Center for Molecular Medicine, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria.
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36
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Hirano KI, Tanaka T, Ikeda Y, Yamaguchi S, Zaima N, Kobayashi K, Suzuki A, Sakata Y, Sakata Y, Kobayashi K, Toda T, Fukushima N, Ishibashi-Ueda H, Tavian D, Nagasaka H, Hui SP, Chiba H, Sawa Y, Hori M. Genetic mutations in adipose triglyceride lipase and myocardial up-regulation of peroxisome proliferated activated receptor-γ in patients with triglyceride deposit cardiomyovasculopathy. Biochem Biophys Res Commun 2013; 443:574-9. [PMID: 24332944 DOI: 10.1016/j.bbrc.2013.12.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2013] [Accepted: 12/02/2013] [Indexed: 01/02/2023]
Abstract
Adipose triglyceride lipase (ATGL, also known as PNPLA2) is an essential molecule for hydrolysis of intracellular triglyceride (TG). Genetic ATGL deficiency is a rare multi-systemic neutral lipid storage disease. Information regarding its clinical profile and pathophysiology, particularly for cardiac involvement, is still very limited. A previous middle-aged ATGL-deficient patient in our institute (Case 1) with severe heart failure required cardiac transplantation (CTx) and exhibited a novel phenotype, "Triglyceride deposit cardiomyovasculopathy (TGCV)". Here, we tried to elucidate molecular mechanism underlying TGCV. The subjects were two cases with TGCV, including our second case who was a 33-year-old male patient (Case 2) with congestive heart failure requiring CTx. Case 2 was homozygous for a point mutation in the 5' splice donor site of intron 5 in the ATGL, which results in at least two types of mRNAs due to splicing defects. The myocardium of both patients (Cases 1 and 2) showed up-regulation of peroxisome proliferated activated receptors (PPARs), key transcription factors for metabolism of long chain fatty acids (LCFAs), which was in contrast to these molecules' lower expression in ATGL-targeted mice. We investigated the intracellular metabolism of LCFAs under human ATGL-deficient conditions using patients' passaged skin fibroblasts as a model. ATGL-deficient cells showed higher uptake and abnormal intracellular transport of LCFA, resulting in massive TG accumulation. We used these findings from cardiac specimens and cell-biological experiments to construct a hypothetical model to clarify the pathophysiology of the human disorder. In patients with TGCV, even when hydrolysis of intracellular TG is defective, the marked up-regulation of PPARγ and related genes may lead to increased uptake of LCFAs, the substrates for TG synthesis. This potentially vicious cycle of LCFAs could explain the massive accumulation of TG and severe clinical course for this rare disease.
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Affiliation(s)
- Ken-ichi Hirano
- Laboratory of Cardiovascular Disease, Novel, Non-Invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan; Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan.
| | - Tatsuya Tanaka
- Center for Medical Research and Education, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yoshihiko Ikeda
- Department of Pathology, National Cerebral and Cardiovascular Center, 5-7-1 Fujishirodai, Suita 565-8565, Japan
| | - Satoshi Yamaguchi
- Laboratory of Cardiovascular Disease, Novel, Non-Invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan; Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Nobuhiro Zaima
- Department of Applied Biochemistry, Kinki University, 3327-204, Nakamachi, Nara 631-8505, Japan
| | - Kazuhiro Kobayashi
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Akira Suzuki
- Laboratory of Cardiovascular Disease, Novel, Non-Invasive, and Nutritional Therapeutics (CNT), Graduate School of Medicine, Osaka University, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan; Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yasuhiko Sakata
- Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan; Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, 1-1, Seiryo-cho, Aoba-ku, Sendai 980-8574, Japan
| | - Yasushi Sakata
- Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kunihisa Kobayashi
- Department of Endocrinology and Diabetes Mellitus, Fukuoka University Chikushi Hospital, 1-1-1, Zokumyoin, Chikushino, Fukuoka 818-8502, Japan
| | - Tatsushi Toda
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Norihide Fukushima
- Department of Cardiovascular Surgery, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hatsue Ishibashi-Ueda
- Department of Pathology, National Cerebral and Cardiovascular Center, 5-7-1 Fujishirodai, Suita 565-8565, Japan
| | - Daniela Tavian
- Laboratory of Cellular Biochemistry and Molecular Biology - CRIBENS, Catholic University of the Sacred Heart, Largo Gemelli 1, Milan 20123, Italy
| | - Hironori Nagasaka
- Department of Pediatrics, Takarazuka City Hosptial, 4-5-1, Kohama, Takarazuka, Hyogo 665-0827, Japan
| | - Shu-Ping Hui
- Faculty of Health Sciences, Hokkaido University, Kita-12, Nishi-5, Sapporo 060-0812, Japan
| | - Hitoshi Chiba
- Faculty of Health Sciences, Hokkaido University, Kita-12, Nishi-5, Sapporo 060-0812, Japan
| | - Yoshiki Sawa
- Department of Cardiovascular Surgery, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Masatsugu Hori
- Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita, Osaka 565-0871, Japan
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Schrammel A, Mussbacher M, Winkler S, Haemmerle G, Stessel H, Wölkart G, Zechner R, Mayer B. Cardiac oxidative stress in a mouse model of neutral lipid storage disease. Biochim Biophys Acta Mol Cell Biol Lipids 2013; 1831:1600-8. [PMID: 23867907 PMCID: PMC3795454 DOI: 10.1016/j.bbalip.2013.07.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 06/19/2013] [Accepted: 07/08/2013] [Indexed: 12/11/2022]
Abstract
Cardiac oxidative stress has been implicated in the pathogenesis of hypertrophy, cardiomyopathy and heart failure. Systemic deletion of the gene encoding adipose triglyceride lipase (ATGL), the enzyme that catalyzes the rate-limiting step of triglyceride lipolysis, results in a phenotype characterized by severe steatotic cardiac dysfunction. The objective of the present study was to investigate a potential role of oxidative stress in cardiac ATGL deficiency. Hearts of mice with global ATGL knockout were compared to those of mice with cardiomyocyte-restricted overexpression of ATGL and to those of wildtype littermates. Our results demonstrate that oxidative stress, measured as lucigenin chemiluminescence, was increased ~ 6-fold in ATGL-deficient hearts. In parallel, cytosolic NADPH oxidase subunits p67phox and p47phox were upregulated 4–5-fold at the protein level. Moreover, a prominent upregulation of different inflammatory markers (tumor necrosis factor α, monocyte chemotactant protein-1, interleukin 6, and galectin-3) was observed in those hearts. Both the oxidative and inflammatory responses were abolished upon cardiomyocyte-restricted overexpression of ATGL. Investigating the effect of oxidative and inflammatory stress on nitric oxide/cGMP signal transduction we observed a ~ 2.5-fold upregulation of soluble guanylate cyclase activity and a ~ 2-fold increase in cardiac tetrahydrobiopterin levels. Systemic treatment of ATGL-deficient mice with the superoxide dismutase mimetic Mn(III)tetrakis (4-benzoic acid) porphyrin did not ameliorate but rather aggravated cardiac oxidative stress. Our data suggest that oxidative and inflammatory stress seems involved in lipotoxic heart disease. Upregulation of soluble guanylate cyclase and cardiac tetrahydrobiopterin might be regarded as counterregulatory mechanisms in cardiac ATGL deficiency. ATGL(−/−) mice suffer from severe cardiac oxidative stress originating from upregulation of NOX2-dependent NADPH oxidase. Inflammation markers TNFα, MCP-1, IL-6, and Mac-2 are increased in cardiac ATGL deficiency. Activity of sGC and cardiac BH4 levels are elevated in ATGL(−/−) hearts. Systemic treatment of ATGL(−/−) mice with the SOD mimetic MnTBAP did not ameliorate oxidative stress.
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Key Words
- (s)GC
- (soluble) guanylate cyclase
- 2,2-diethyl-1-nitroso-oxyhydrazine
- ATGL
- ATGL(−/−)
- Adipose triglyceride lipase
- BH(2)
- BH(4)
- Cardiac hypertrophy
- DAG
- DEA/NO
- FFA
- GAPDH
- IL-6
- Inflammation
- MCP-1
- Mac-2
- Mn(III)tetrakis (4-benzoic acid) porphyrin chloride
- MnTBAP
- NADPH
- NADPH oxidase
- NO
- NOX
- ONOO(−)
- Oxidative stress
- PBS
- PKC
- PPARα
- SOD
- TG
- TNFα
- VASP
- adipose triglyceride lipase
- adipose triglyceride lipase knockout
- diacylglycerol
- dihydrobiopterin, [2-amino-6-(1,2-dihydroxypropyl)-7,8-dihydro-1H-pteridin-4-one]
- eNOS
- endothelial nitric oxide synthase
- free fatty acid
- galectin-3
- glyceraldehyde-3-phosphate dehydrogenase
- iNOS
- inducible nitric oxide synthase
- interleukin 6
- monocyte chemotactic protein-1
- nNOS
- neuronal nitric oxide synthase
- nicotinamide adenine dinucleotide phosphate
- nitric oxide
- pVASP
- peroxisome proliferator receptor α
- peroxynitrite
- phosphate-buffered saline
- phosphorylated vasodilator-stimulated phosphoprotein
- protein kinase C
- superoxide dismutase
- tetrahydrobiopterin, [(6R)-2-amino-6-[(1R,2S)-1,2-dihydroxypropyl]-5,6,7,8-tetrahydropteridin-4(1H)-one]
- triacylglycerol
- tumor necrosis factor α
- vasodilator-stimulated phosphoprotein
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Affiliation(s)
- Astrid Schrammel
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
- Corresponding author. Tel.: + 43 316 380 5559; fax: + 43 316 380 9890.
| | - Marion Mussbacher
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Sarah Winkler
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Guenter Haemmerle
- Department of Molecular Biosciences, University of Graz, Heinrichstraße 31, 8010 Graz, Austria
| | - Heike Stessel
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Gerald Wölkart
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Rudolf Zechner
- Department of Molecular Biosciences, University of Graz, Heinrichstraße 31, 8010 Graz, Austria
| | - Bernd Mayer
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
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