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Alarcón-Vila C, Insausti-Urkia N, Torres S, Segalés-Rovira P, Conde de la Rosa L, Nuñez S, Fucho R, Fernández-Checa JC, García-Ruiz C. Dietary and genetic disruption of hepatic methionine metabolism induce acid sphingomyelinase to promote steatohepatitis. Redox Biol 2023; 59:102596. [PMID: 36610223 PMCID: PMC9827379 DOI: 10.1016/j.redox.2022.102596] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 12/28/2022] [Indexed: 01/03/2023] Open
Abstract
Alcoholic (ASH) and nonalcoholic. (NASH).steatohepatitis are advanced.stages.of.fatty.liver.disease.Methionine adenosyltransferase 1A (MAT1A) plays a key role in hepatic methionine metabolism and germline Mat1a deletion in mice promotes NASH. Acid sphingomyelinase (ASMase) triggers hepatocellular apoptosis and liver fibrosis and has been shown to downregulate MAT1A expression in the context of fulminant liver failure. Given the role of ASMase in steatohepatitis development, we investigated the status of ASMase in Mat1a-/- mice and the regulation of ASMase by SAM/SAH. Consistent with its role in NASH, Mat1a-/- mice fed a choline-deficient (CD) diet exhibited macrosteatosis, inflammation, fibrosis and liver injury as well as reduced total and mitochondrial GSH levels. Our data uncovered an increased basal expression and activity of ASMase but not neutral SMase in Mat1a-/- mice, which further increased upon CD feeding. Interestingly, adenovirus-mediated shRNA expression targeting ASMase reduced ASMase activity and protected Mat1a-/- mice against CD diet-induced NASH. Similar results were observed in CD fed Mat1a-/- mice by pharmacological inhibition of ASMase with amitriptyline. Moreover, Mat1a/ASMase double knockout mice were resistant to CD-induced NASH. ASMase knockdown protected wild type mice against NASH induced by feeding a diet deficient in methionine and choline. Furthermore, Mat1a-/- mice developed acute-on-chronic ASH and this outcome was ameliorated by amitriptyline treatment. In vitro data in primary mouse hepatocytes revealed that decreased SAM/SAH ratio increased ASMase mRNA level and activity. MAT1A and ASMase mRNA levels exhibited an inverse correlation in liver samples from patients with ASH and NASH. Thus, disruption of methionine metabolism sensitizes to steatohepatitis by ASMase activation via decreased SAM/SAH. These findings imply that MAT1A deletion and ASMase activation engage in a self-sustained loop of relevance for steatohepatitis.
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Affiliation(s)
- Cristina Alarcón-Vila
- Cell Death and Proliferation, Instituto de Investigaciones Biomédicas de Barcelona, CSIC, Barcelona, Spain; Liver Unit, Hospital Clínic I Provincial, IDIBAPS, Barcelona, Spain; CIBERehd, University of Barcelona, Spain
| | - Naroa Insausti-Urkia
- Cell Death and Proliferation, Instituto de Investigaciones Biomédicas de Barcelona, CSIC, Barcelona, Spain; Liver Unit, Hospital Clínic I Provincial, IDIBAPS, Barcelona, Spain; CIBERehd, University of Barcelona, Spain
| | - Sandra Torres
- Cell Death and Proliferation, Instituto de Investigaciones Biomédicas de Barcelona, CSIC, Barcelona, Spain; Liver Unit, Hospital Clínic I Provincial, IDIBAPS, Barcelona, Spain; CIBERehd, University of Barcelona, Spain
| | - Paula Segalés-Rovira
- Cell Death and Proliferation, Instituto de Investigaciones Biomédicas de Barcelona, CSIC, Barcelona, Spain; Liver Unit, Hospital Clínic I Provincial, IDIBAPS, Barcelona, Spain; CIBERehd, University of Barcelona, Spain
| | - Laura Conde de la Rosa
- Cell Death and Proliferation, Instituto de Investigaciones Biomédicas de Barcelona, CSIC, Barcelona, Spain; Liver Unit, Hospital Clínic I Provincial, IDIBAPS, Barcelona, Spain; CIBERehd, University of Barcelona, Spain
| | - Susana Nuñez
- Cell Death and Proliferation, Instituto de Investigaciones Biomédicas de Barcelona, CSIC, Barcelona, Spain; Liver Unit, Hospital Clínic I Provincial, IDIBAPS, Barcelona, Spain; CIBERehd, University of Barcelona, Spain
| | - Raquel Fucho
- Cell Death and Proliferation, Instituto de Investigaciones Biomédicas de Barcelona, CSIC, Barcelona, Spain; Liver Unit, Hospital Clínic I Provincial, IDIBAPS, Barcelona, Spain; CIBERehd, University of Barcelona, Spain
| | - Jose C Fernández-Checa
- Cell Death and Proliferation, Instituto de Investigaciones Biomédicas de Barcelona, CSIC, Barcelona, Spain; Liver Unit, Hospital Clínic I Provincial, IDIBAPS, Barcelona, Spain; CIBERehd, University of Barcelona, Spain; University of Southern California Research Center for Liver Diseases, Keck School of Medicine, USC, Los Angeles, CA, USA.
| | - Carmen García-Ruiz
- Cell Death and Proliferation, Instituto de Investigaciones Biomédicas de Barcelona, CSIC, Barcelona, Spain; Liver Unit, Hospital Clínic I Provincial, IDIBAPS, Barcelona, Spain; CIBERehd, University of Barcelona, Spain; University of Southern California Research Center for Liver Diseases, Keck School of Medicine, USC, Los Angeles, CA, USA.
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Puah PY, Lee DJH, Puah SH, Lah NASN, Ling YS, Fong SY. High-throughput metabolomics reveals dysregulation of hydrophobic metabolomes in cancer cell lines by Eleusine indica. Sci Rep 2022; 12:9347. [PMID: 35668092 PMCID: PMC9168358 DOI: 10.1038/s41598-022-13575-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 05/18/2022] [Indexed: 11/09/2022] Open
Abstract
Eleusine indica, which is used in traditional medicine, exhibits antiproliferative activity against several cancer cell lines. However, metabolomic studies to evaluate the metabolite changes induced by E. indica in cancer cells are still lacking. The present study investigated the anticancer effects of a root fraction of E. indica (R-S5-C1-H1) on H1299, MCF-7, and SK-HEP-1 cell lines and analyzed metabolic changes in the treated cancer cells using ultra-high-performance liquid chromatography high-resolution mass spectrometry (UHPLC-HRMS). Cell metabolic activity assays demonstrated that the cell viability of the three cancer cell lines was significantly reduced following treatment with R-S5-C1-H1, with half-maximal inhibitory concentrations values of 12.95 µg/mL, 15.99 µg/mL, and 13.69 µg/mL at 72 h, respectively. Microscopy analysis using Hoechst 33342 and Annexin V fluorescent dyes revealed that cells treated with R-S5-C1-H1 underwent apoptotic cell death, while chemometric analysis suggested that apoptosis was triggered 48 h after treatment with R-S5-C1-H1. Deconvoluted cellular metabolomics revealed that hydrophobic metabolites were significantly altered, including triacylglycerols, phosphatidylcholine, phosphatidylethanolamine, sphingomyelin, and ceramide, suggesting that apoptosis induction by R-S5-C1-H1 potentially occurred through modulation of phospholipid synthesis and sphingolipid metabolism. These metabolomic profiling results provide new insights into the anticancer mechanisms of E. indica and facilitate the overall understanding of molecular events following therapeutic interventions.
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Affiliation(s)
- Perng Yang Puah
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Malaysia Sabah, Jalan UMS, 88400, Kota Kinabalu, Sabah, Malaysia
| | - Dexter Jiunn Herng Lee
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, 88400, Kota Kinabalu, Sabah, Malaysia
| | - Soo Huan Puah
- Medical Department, Sarawak General Hospital, Jalan Hospital, 93586, Kuching, Sarawak, Malaysia
- Medical Department, Hospital Seberang Jaya, Jalan Tun Hussein Onn, Seberang Jaya, 13700, Permatang Pauh, Penang, Malaysia
| | - Nik Amin Sahid Nik Lah
- Department of Surgery, Faculty of Medicine and Health Sciences, Universiti Malaysia Sabah, Jalan UMS, 88400, Kota Kinabalu, Sabah, Malaysia
| | - Yee Soon Ling
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, 88400, Kota Kinabalu, Sabah, Malaysia.
- CAIQ Certification Sdn Bhd Kota Kinabalu, Sabah, Malaysia.
| | - Siat Yee Fong
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Malaysia Sabah, Jalan UMS, 88400, Kota Kinabalu, Sabah, Malaysia.
- Borneo Medical and Health Research Centre, Faculty of Medicine and Health Sciences, Universiti Malaysia Sabah, Jalan UMS, 88400, Kota Kinabalu, Sabah, Malaysia.
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3
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The study of neuroprotective effect of ferulic acid based on cell metabolomics. Eur J Pharmacol 2019; 864:172694. [DOI: 10.1016/j.ejphar.2019.172694] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 09/23/2019] [Accepted: 09/24/2019] [Indexed: 11/22/2022]
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Zhang X, Hou H, Chen H, Liu Y, Wang A, Hu Q. Serum metabolomics of laryngeal cancer based on liquid chromatography coupled with quadrupole time-of-flight mass spectrometry. Biomed Chromatogr 2018; 32:e4181. [PMID: 29272549 DOI: 10.1002/bmc.4181] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 10/27/2017] [Accepted: 12/13/2017] [Indexed: 12/23/2022]
Abstract
The discovery of new laryngeal cancer-related metabolite biomarkers could help to facilitate early diagnosis. A serum metabolomics study from laryngeal cancer patients and healthy individuals was conducted using liquid chromatography coupled with quadrupole time-of-flight mass spectrometry. Univariate and multivariate statistics were used to discriminate laryngeal cancer patients and healthy individuals. 1-Palmitoyl-sn-glycero-3-phosphocholine (LysoPC 16:0), 1-o-hexadecyl-2-acetyl-sn-glycero-3-phosphocholine (PAF) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine were found to be significantly different between the laryngeal cancer group and the healthy group. They are mainly involved in phospholipids catabolism, linoleic acid metabolism, α-linoleic acid metabolism and arachidonic acid metabolism. The area under the curve of the biomarker combined by two metabolites (LysoPC 16:0 and PAF) was 0.935, the sensitivity was 0.962 and the specificity was 0.825. LysoPC 16:0 and PAF may show diagnostic potential for laryngeal carcinoma.
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Affiliation(s)
- Xiaotao Zhang
- China National Tobacco Quality Supervision and Test Center, Zhengzhou High and New Technology Industries Development Zone, Zhengzhou, China.,Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Hongwei Hou
- China National Tobacco Quality Supervision and Test Center, Zhengzhou High and New Technology Industries Development Zone, Zhengzhou, China
| | - Huan Chen
- China National Tobacco Quality Supervision and Test Center, Zhengzhou High and New Technology Industries Development Zone, Zhengzhou, China
| | - Yong Liu
- Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - An Wang
- Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Qingyuan Hu
- China National Tobacco Quality Supervision and Test Center, Zhengzhou High and New Technology Industries Development Zone, Zhengzhou, China.,Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
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Adamyan LV, Starodubtseva N, Borisova A, Stepanian AA, Chagovets V, Salimova D, Wang Z, Kononikhin A, Popov I, Bugrova A, Chingin K, Kozachenko A, Chen H, Frankevich V. Direct Mass Spectrometry Differentiation of Ectopic and Eutopic Endometrium in Patients with Endometriosis. J Minim Invasive Gynecol 2017; 25:426-433. [PMID: 28888701 DOI: 10.1016/j.jmig.2017.08.658] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 08/23/2017] [Accepted: 08/28/2017] [Indexed: 02/07/2023]
Abstract
STUDY OBJECTIVE To introduce a method for the rapid assessment of endometriotic tissues using direct mass spectrometry (MS)-based lipidomics. DESIGN A prospective observational cohort study (Canadian Task Force classification II2). SETTING Department of Operative Gynecology of the Research Centre for Obstetrics, Gynecology and Perinatology. PATIENTS Fifty patients with ovarian cysts and peritoneal endometriosis who underwent laparoscopic surgery between 2014 and 2016. INTERVENTION Differences in mass spectrometric profiles of ectopic endometria (endometriosis) and eutopic endometria were analyzed for each patient in combination with morphohistologic evaluation. The lipidomic approach was applied using a direct high-resolution MS method. MEASUREMENTS AND MAIN RESULTS Of 148 metabolites, 15 showed significant differences between endometriotic tissue and a healthy endometrium of the same patient, considered as a control in this study. The main lipids prevalent in endometriotic tissues were phosphoethanolamine (PE O-20:0), sphingomyelin (SM 34:1), diglycerides (DG 44:9), phosphatidylcholines (PC 32:1, PC O-36:3, PC 38:7, PC 38:6, PC 40:8, PC 40:7, PC 40:6, PC 40:9, and PC O-42:1), and triglycerides (TG 41:2, TG 49:4, and TG 52:3). Using partial least squares discriminant analysis models, MS showed that the lipidomic profile of endometriotic tissue (peritoneal endometriosis and ovarian endometriomas) was clearly separated from the eutopic endometrium, indicating tissue-type differentiation. CONCLUSION Our results suggest that direct MS may play an important role for endometriotic tissue identification. Such an approach has potential usefulness for real-time tissue determination and differentiation during surgical treatment. Lipids of 3 important classes, sphingolipids, phospholipids, and the fatty acids (di- and triglycerides), were identified. Validation is required to determine whether these lipids can be used to discriminate between patients with endometriosis and those with other gynecologic diseases.
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Affiliation(s)
- Leila V Adamyan
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia
| | - Natalia Starodubtseva
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia; Moscow Institute of Physics and Technology, Moscow, Russia
| | - Anna Borisova
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia
| | - Assia A Stepanian
- Academia of Women's Health and Endoscopic Surgery, Atlanta, Georgia.
| | - Vitaliy Chagovets
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia
| | - Dinara Salimova
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia
| | - Zhihao Wang
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang, China
| | - Alexey Kononikhin
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia; Moscow Institute of Physics and Technology, Moscow, Russia
| | - Igor Popov
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia; Moscow Institute of Physics and Technology, Moscow, Russia
| | - Anna Bugrova
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia
| | - Konstantin Chingin
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang, China
| | - Andrey Kozachenko
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia
| | - Huanwen Chen
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang, China
| | - Vladimir Frankevich
- National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia
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Rodriguez-Cuenca S, Pellegrinelli V, Campbell M, Oresic M, Vidal-Puig A. Sphingolipids and glycerophospholipids - The "ying and yang" of lipotoxicity in metabolic diseases. Prog Lipid Res 2017; 66:14-29. [PMID: 28104532 DOI: 10.1016/j.plipres.2017.01.002] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 11/30/2016] [Accepted: 01/05/2017] [Indexed: 12/14/2022]
Abstract
Sphingolipids in general and ceramides in particular, contribute to pathophysiological mechanisms by modifying signalling and metabolic pathways. Here, we present the available evidence for a bidirectional homeostatic crosstalk between sphingolipids and glycerophospholipids, whose dysregulation contributes to lipotoxicity induced metabolic stress. The initial evidence for this crosstalk originates from simulated models designed to investigate the biophysical properties of sphingolipids in plasma membrane representations. In this review, we reinterpret some of the original findings and conceptualise them as a sort of "ying/yang" interaction model of opposed/complementary forces, which is consistent with the current knowledge of lipid homeostasis and pathophysiology. We also propose that the dysregulation of the balance between sphingolipids and glycerophospholipids results in a lipotoxic insult relevant in the pathophysiology of common metabolic diseases, typically characterised by their increased ceramide/sphingosine pools.
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Affiliation(s)
- S Rodriguez-Cuenca
- Metabolic Research Laboratories, Wellcome Trust MRC Institute of Metabolic Science, Addenbrooke's Hospital, University of Cambridge. Cambridge, UK.
| | - V Pellegrinelli
- Metabolic Research Laboratories, Wellcome Trust MRC Institute of Metabolic Science, Addenbrooke's Hospital, University of Cambridge. Cambridge, UK
| | - M Campbell
- Metabolic Research Laboratories, Wellcome Trust MRC Institute of Metabolic Science, Addenbrooke's Hospital, University of Cambridge. Cambridge, UK
| | - M Oresic
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, FI -20520 Turku, Finland
| | - A Vidal-Puig
- Metabolic Research Laboratories, Wellcome Trust MRC Institute of Metabolic Science, Addenbrooke's Hospital, University of Cambridge. Cambridge, UK; Wellcome Trust Sanger Institute, Hinxton, UK.
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7
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Zhang H, Zheng H, Zhao G, Tang C, Lu S, Cheng B, Wu F, Wei J, Liang Y, Ruan J, Song H, Su Z. Metabolomic study of corticosterone-induced cytotoxicity in PC12 cells by ultra performance liquid chromatography-quadrupole/time-of-flight mass spectrometry. MOLECULAR BIOSYSTEMS 2016; 12:902-13. [PMID: 26775910 DOI: 10.1039/c5mb00642b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Glucocorticoids (GCs) have been proved to be an important pathogenic factor of some neuropsychiatric disorders. Usually, a classical injury model based on corticosterone-induced cytotoxicity of differentiated rat pheochromocytoma (PC12) cells was used to stimulate the state of GC damage of hippocampal neurons and investigate its potential mechanisms involved. However, up to now, the mechanism of corticosterone-induced cytotoxicity in PC12 cells was still looking forward to further elucidation. In this work, the metabolomic study of the biochemical changes caused by corticosterone-induced cytotoxicity in differentiated PC12 cells with different corticosterone concentrations was performed for the first time, using the ultra performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC-Q/TOF MS). Partial least squares-discriminate analysis (PLS-DA) indicated that metabolic profiles of different corticosterone treatment groups deviated from the control group. A total of fifteen metabolites were characterized as potential biomarkers involved in corticosterone-induced cytotoxicity, which were corresponding to the dysfunctions of five pathways including glycerophospholipid metabolism, sphingolipid metabolism, oxidation of fatty acids, glycerolipid metabolism and sterol lipid metabolism. This study indicated that the rapid and holistic cell metabolomics approach might be a powerful tool to further study the pathogenesis mechanism of corticosterone-induced cytotoxicity in PC12 cells.
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Affiliation(s)
- Hongye Zhang
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
| | - Hua Zheng
- Medical Scientific Research Center, Guangxi Medical University, Nanning 530021, China
| | - Gan Zhao
- Department of Pharmacy, The Maternal & Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning 530003, China
| | - Chaoling Tang
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
| | - Shiyin Lu
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
| | - Bang Cheng
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
| | - Fang Wu
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
| | - Jinbin Wei
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
| | - Yonghong Liang
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
| | - Junxiang Ruan
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
| | - Hui Song
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
| | - Zhiheng Su
- Pharmaceutical College, Guangxi Medical University, Nanning 530021, China.
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8
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Trousil S, Kaliszczak M, Schug Z, Nguyen QD, Tomasi G, Favicchio R, Brickute D, Fortt R, Twyman FJ, Carroll L, Kalusa A, Navaratnam N, Adejumo T, Carling D, Gottlieb E, Aboagye EO. The novel choline kinase inhibitor ICL-CCIC-0019 reprograms cellular metabolism and inhibits cancer cell growth. Oncotarget 2016; 7:37103-37120. [PMID: 27206796 PMCID: PMC5095062 DOI: 10.18632/oncotarget.9466] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2015] [Accepted: 04/25/2016] [Indexed: 12/25/2022] Open
Abstract
The glycerophospholipid phosphatidylcholine is the most abundant phospholipid species of eukaryotic membranes and essential for structural integrity and signaling function of cell membranes required for cancer cell growth. Inhibition of choline kinase alpha (CHKA), the first committed step to phosphatidylcholine synthesis, by the selective small-molecule ICL-CCIC-0019, potently suppressed growth of a panel of 60 cancer cell lines with median GI50 of 1.12 μM and inhibited tumor xenograft growth in mice. ICL-CCIC-0019 decreased phosphocholine levels and the fraction of labeled choline in lipids, and induced G1 arrest, endoplasmic reticulum stress and apoptosis. Changes in phosphocholine cellular levels following treatment could be detected non-invasively in tumor xenografts by [18F]-fluoromethyl-[1,2-2H4]-choline positron emission tomography. Herein, we reveal a previously unappreciated effect of choline metabolism on mitochondria function. Comparative metabolomics demonstrated that phosphatidylcholine pathway inhibition leads to a metabolically stressed phenotype analogous to mitochondria toxin treatment but without reactive oxygen species activation. Drug treatment decreased mitochondria function with associated reduction of citrate synthase expression and AMPK activation. Glucose and acetate uptake were increased in an attempt to overcome the metabolic stress. This study indicates that choline pathway pharmacological inhibition critically affects the metabolic function of the cell beyond reduced synthesis of phospholipids.
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Affiliation(s)
- Sebastian Trousil
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Maciej Kaliszczak
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Zachary Schug
- Cancer Research UK, Beatson Institute, Garscube Estate, Glasgow, UK
| | - Quang-De Nguyen
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Giampaolo Tomasi
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Rosy Favicchio
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Diana Brickute
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Robin Fortt
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Frazer J. Twyman
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Laurence Carroll
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Andrew Kalusa
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
| | - Naveenan Navaratnam
- Cellular Stress Group, MRC Clinical Sciences Centre, Faculty of Medicine, Imperial College, Hammersmith Campus, London, UK
| | - Thomas Adejumo
- Cellular Stress Group, MRC Clinical Sciences Centre, Faculty of Medicine, Imperial College, Hammersmith Campus, London, UK
| | - David Carling
- Cellular Stress Group, MRC Clinical Sciences Centre, Faculty of Medicine, Imperial College, Hammersmith Campus, London, UK
| | - Eyal Gottlieb
- Cancer Research UK, Beatson Institute, Garscube Estate, Glasgow, UK
| | - Eric O. Aboagye
- Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital, London, UK
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Acid sphingomyelinase-ceramide system in steatohepatitis: a novel target regulating multiple pathways. J Hepatol 2015; 62:219-33. [PMID: 25281863 DOI: 10.1016/j.jhep.2014.09.023] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Revised: 09/13/2014] [Accepted: 09/24/2014] [Indexed: 02/07/2023]
Abstract
Steatohepatitis (SH) is an intermediate stage of fatty liver disease and is one of the most common causes of chronic liver disease worldwide that may progress to cirrhosis and liver cancer. SH encompasses alcoholic and non-alcoholic steatohepatitis, the latter being of particular concern as it is associated with obesity and insulin resistance and has become a major cause of liver transplantation. The molecular mechanisms governing the transition from steatosis to SH are not fully understood. Here we discuss emerging data indicating that the acid sphingomyelinase (ASMase), a specific mechanism of ceramide generation, is required for the activation of key pathways that regulate steatosis, fibrosis and lipotoxicity, including endoplasmic reticulum stress, autophagy and lysosomal membrane permeabilization. Moreover, ASMase modulates alterations of the methionine cycle and phosphatidylcholine homeostasis, two crucial events involved in SH that regulate methylation reactions, antioxidant defence and membrane integrity. These new findings suggest that targeting ASMase in combination with restoring methionine metabolism and phosphatidylcholine levels may be of utility in the treatment of SH.
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Agassandian M, Mallampalli RK. Surfactant phospholipid metabolism. Biochim Biophys Acta Mol Cell Biol Lipids 2012; 1831:612-25. [PMID: 23026158 DOI: 10.1016/j.bbalip.2012.09.010] [Citation(s) in RCA: 153] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 09/07/2012] [Accepted: 09/16/2012] [Indexed: 12/16/2022]
Abstract
Pulmonary surfactant is essential for life and is composed of a complex lipoprotein-like mixture that lines the inner surface of the lung to prevent alveolar collapse at the end of expiration. The molecular composition of surfactant depends on highly integrated and regulated processes involving its biosynthesis, remodeling, degradation, and intracellular trafficking. Despite its multicomponent composition, the study of surfactant phospholipid metabolism has focused on two predominant components, disaturated phosphatidylcholine that confers surface-tension lowering activities, and phosphatidylglycerol, recently implicated in innate immune defense. Future studies providing a better understanding of the molecular control and physiological relevance of minor surfactant lipid components are needed. This article is part of a Special Issue entitled Phospholipids and Phospholipid Metabolism.
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Affiliation(s)
- Marianna Agassandian
- Department of Medicine, Acute Lung Injury Center of Excellence, the University of Pittsburgh, Pittsburgh, PA 15213, USA
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11
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Niebergall LJ, Vance DE. The ratio of phosphatidylcholine to phosphatidylethanolamine does not predict integrity of growing MT58 Chinese hamster ovary cells. Biochim Biophys Acta Mol Cell Biol Lipids 2012; 1821:324-34. [DOI: 10.1016/j.bbalip.2011.10.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Revised: 09/30/2011] [Accepted: 10/24/2011] [Indexed: 12/15/2022]
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Butler PL, Mallampalli RK. Cross-talk between remodeling and de novo pathways maintains phospholipid balance through ubiquitination. J Biol Chem 2009; 285:6246-58. [PMID: 20018880 DOI: 10.1074/jbc.m109.017350] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Phosphatidylcholine (PtdCho), the major phospholipid of animal membranes, is generated by its remodeling and de novo synthesis. Overexpression of the remodeling enzyme, LPCAT1 (acyl-CoA:lysophosphatidylcholine acyltransferase) in epithelia decreased de novo PtdCho synthesis without significantly altering cellular PtdCho mass. Overexpression of LPCAT1 increased degradation of CPT1 (cholinephosphotransferase), a resident Golgi enzyme that catalyzes the terminal step for de novo PtdCho synthesis. CPT1 degradation involved its multiubiquitination and processing via the lysosomal pathway. CPT1 mutants harboring arginine substitutions at multiple carboxyl-terminal lysines exhibited proteolytic resistance to effects of LPCAT1 overexpression in cells and restored de novo PtdCho synthesis. Thus, cross-talk between phospholipid remodeling and de novo pathways involves ubiquitin-lysosomal processing of a key molecular target that mechanistically provides homeostatic control of cellular PtdCho content.
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Affiliation(s)
- Phillip L Butler
- Department of Biochemistry, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242, USA
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13
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Long-chain ceramide produced in response to N-hexanoylsphingosine does not induce apoptosis in CHP-100 cells. Lipids 2009; 44:1039-46. [PMID: 19784683 DOI: 10.1007/s11745-009-3350-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2009] [Accepted: 09/15/2009] [Indexed: 12/11/2022]
Abstract
It has been previously reported that treatment of CHP-100 human neuroepithelioma cells with N-hexanoylsphingosine (C6-Cer) induces intracellular accumulation of long-chain ceramide (LC-Cer) and apoptosis. Herein, we investigated the existence of any causal relationship between the two phenomena. We report that C6-Cer-evoked LC-Cer accumulation is potently attenuated by the ceramide synthase inhibitor fumonisin B1; however, fumonisin B1 neither affects the apoptotic response evoked by C6-Cer administration, nor is toxic by itself to CHP-100 cells. Different to fumonisin B1, the serine-palmitoyltransferase inhibitor L: -cycloserine does not attenuate C6-Cer-evoked LC-Cer accumulation, thus suggesting that LC-Cer is produced via the sphingosine salvage pathway. Consistently, CHP-100 cells accumulate LC-Cer in response to sphingosine administration; however, their viability is not affected. The above-reported results indicate that, in the cell system investigated, C6-Cer, but not LC-Cer, is involved in apoptosis induction. As this finding is discussed in the light of the evidence that C6-Cer-induced apoptosis associates with cytochrome c release into the cytosol and caspase-9 activation, thus calling for an involvement of the mitochondrial pathway, it also lends support to the notion that caution must be exercised when investigating the biological effects of endogenous ceramide by use of exogenously administered short-chain analogues.
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14
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Gustin SE, Western PS, McClive PJ, Harley VR, Koopman PA, Sinclair AH. Testis development, fertility, and survival in Ethanolamine kinase 2-deficient mice. Endocrinology 2008; 149:6176-86. [PMID: 18755794 DOI: 10.1210/en.2008-0584] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Ethanolamine kinase 2 (Eki2) was previously isolated from a differential expression screen designed to identify candidate genes involved in testis development and differentiation. In mouse, Eki2 is specifically up-regulated in Sertoli cells of the developing testis at the time of sex determination. Based on this expression profile, Eki2 was considered a good candidate testis-determining gene. To investigate a possible role of Eki2 in testis development, we have generated a mouse with targeted disruption of the Eki2 gene by using an EGFP replacement strategy. No abnormalities were detected in the Eki2-deficient mice with regard to embryonic and adult testis morphology, differentiation, function, or fertility. Furthermore, no significant differences were observed in litter sizes, pup mortality rates, or distribution of the sexes among the offspring. Ethanolamine kinases are involved in the biosynthesis of phosphatidylethanolamine, a major membrane phospholipid. Expression analysis indicates that the absence of an apparent phenotype in the Eki2-deficient mice may be due to compensation by Eki2-family members or the activation of an alternative pathway to generate phosphatidylethanolamine. Expression of EGFP in this mouse model enabled the isolation of gonad cell populations, providing a useful resource from which to obtain relatively pure early steroidogenic cells for further studies.
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Affiliation(s)
- Sonja E Gustin
- Murdoch Children's Research Institute, University of Melbourne, Royal Children's Hospital, Melbourne, Victoria 3052, Australia
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15
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Bakovic M, Fullerton MD, Michel V. Metabolic and molecular aspects of ethanolamine phospholipid biosynthesis: the role of CTP:phosphoethanolamine cytidylyltransferase (Pcyt2). Biochem Cell Biol 2007; 85:283-300. [PMID: 17612623 DOI: 10.1139/o07-006] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The CDP-ethanolamine branch of the Kennedy pathway is the major route for the formation of ethanolamine-derived phospholipids, including diacyl phosphatidylethanolamine and alkenylacyl phosphatidylethanolamine derivatives, known as plasmalogens. Ethanolamine phospholipids are essential structural components of the cell membranes and play regulatory roles in cell division, cell signaling, activation, autophagy, and phagocytosis. The physiological importance of plasmalogens has not been not fully elucidated, although they are known for their antioxidant properties and deficiencies in a number of inherited peroxisomal disorders. This review highlights important aspects of ethanolamine phospholipid metabolism and reports current molecular information on 1 of the regulatory enzymes in their synthesis, CTP:phosphoethanolamine cytidylyltransferase (Pcyt2). Pcyt2 is encoded by a single, nonredundant gene in animal species that could be alternatively spliced into 2 potential protein products. We describe properties of the mouse and human Pcyt2 genes and their regulatory promoters and provide molecular evidence for the existence of 2 distinct Pcyt2 proteins. The goal is to obtain more insight into Pcyt2 catalytic function and regulation to facilitate a better understanding of the production of ethanolamine phospholipids via the CDP-ethanolamine branch of the Kennedy pathway.
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Affiliation(s)
- Marica Bakovic
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
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16
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Fresina M, Dickmann A, Salerni A, De Gregorio F, Campos EC. Effect of oral CDP-choline on visual function in young amblyopic patients. Graefes Arch Clin Exp Ophthalmol 2007; 246:143-50. [PMID: 17638004 DOI: 10.1007/s00417-007-0621-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2007] [Revised: 05/28/2007] [Accepted: 05/29/2007] [Indexed: 10/23/2022] Open
Abstract
PURPOSE The purpose of the study was to evaluate the effect on visual function of orally administered CDP-choline in addition to patching for the treatment of amblyopia in children. METHODS This was an open label parallel group study comparing patching plus oral CDP-choline with patching alone. Sixty-one participants (aged between 5 and 10 years) suffering from anisometropic or strabismic amblyopia were divided at random into two groups: Group A, 800 or 1,200 mg (according to the body weight) of orally administered CDP-choline and 2-h patching a day; Group B, 2-h patching a day. Both groups were treated for 30 consecutive days. A follow-up visit was set 60 days after the treatment was discontinued. The main outcome measure was the change in visual acuity of amblyopic eyes as measured by Snellen's E charts. The secondary outcome measures were changes in the visual acuity of amblyopic eye as measured by isolated letters (Snellen's E) and changes in the contrast sensitivity of amblyopic eyes. RESULTS The addition of CDP-choline to patching therapy was not found to be more effective than patching alone after 30-day treatment. The present results showed that adding CDP-choline to patching stabilised the effects obtained during the treatment period. In fact, whereas the participants treated only with patching showed a decrease in visual acuity at 90 days, these receiving CDP-choline and patching combined appeared to maintain the results obtained (two-way ANOVA: P = 0.0042). Similar results were obtained when measuring visual acuity by isolated Snellen's E letters. CONCLUSIONS In amblyopic patients, CDP-choline combined with patching contributes to obtaining more stable effects than patching alone.
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Affiliation(s)
- Michela Fresina
- Ophthalmology Service, University of Bologna, Bologna, Italy
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17
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Dindo D, Dahm F, Szulc Z, Bielawska A, Obeid LM, Hannun YA, Graf R, Clavien PA. Cationic long-chain ceramide LCL-30 induces cell death by mitochondrial targeting in SW403 cells. Mol Cancer Ther 2006; 5:1520-9. [PMID: 16818511 DOI: 10.1158/1535-7163.mct-05-0513] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Ceramides are sphingolipid second messengers that are involved in the mediation of cell death. There is accumulating evidence that mitochondria play a central role in ceramide-derived toxicity. We designed a novel cationic long-chain ceramide [omega-pyridinium bromide D-erythro-C16-ceramide (LCL-30)] targeting negatively charged mitochondria. Our results show that LCL-30 is highly cytotoxic to SW403 cells (and other cancer cell lines) and preferentially accumulates in mitochondria, resulting in a decrease of the mitochondrial membrane potential, release of mitochondrial cytochrome c, and activation of caspase-3 and caspase-9. Ultrastructural analyses support the concept of mitochondrial selectivity. Interestingly, levels of endogenous mitochondrial C16-ceramide decreased by more than half, whereas levels of sphingosine-1-phosphate increased dramatically and selectively in mitochondria after administration of LCL-30, suggesting the presence of a mitochondrial sphingosine kinase. Of note, intracellular long-chain ceramide levels and sphingosine-1-phosphate remained unaffected in the cytosolic and extramitochondrial (nuclei/cellular membranes) cellular fractions. Furthermore, a synergistic effect of cotreatment of LCL-30 and doxorubicin was observed, which was not related to alterations in endogenous ceramide levels. Cationic long-chain pyridinium ceramides might be promising new drugs for cancer therapy through their mitochondrial preference.
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Affiliation(s)
- Daniel Dindo
- Swiss HPB Center, Department of Visceral and Transplantation Surgery, University Hospital Zurich, Rämistrasse 100, CH-8091 Zurich, Switzerland
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18
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Sinha Roy S, Mukherjee S, Kabir S, Rajaratnam V, Smith M, Das SK. Inhibition of cholinephosphotransferase activity in lung injury induced by 2-chloroethyl ethyl sulfide, a mustard analog. J Biochem Mol Toxicol 2006; 19:289-97. [PMID: 16292752 DOI: 10.1002/jbt.20092] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Exposure to mustard gas causes inflammatory lung diseases including acute respiratory distress syndrome (ARDS). A defect in the lung surfactant system has been implicated as a cause of ARDS. A major component of lung surfactant is dipalmitoyl phosphatidylcholine (DPPC) and the major pathway for its synthesis is the cytidine diphosphocholine (CDP-choline) pathway. It is not known whether the ARDS induced by mustard gas is mediated by its direct effects on some of the enzymes in the CDP-choline pathway. In the present study we investigated whether mustard gas exposure modulates the activity of cholinephosphotransferase (CPT) the terminal enzyme by CDP-choline pathway. Adult guinea pigs were intratracheally infused with single doses of 2-chloroethyl ethyl sulfide (CEES) (0.5 mg/kg b.wt. in ethanol). Control animals were injected with vehicles only. The animals were sacrificed at different time and the lungs were removed after perfusion with physiological saline. CPT activity increased steadily up to 4 h and then decreased at 6 h and stabilized at 7 days in both mitochondria and microsomes. To determine the dose-dependent effect of CEES on CPT activity we varied the doses of CEES (0.5-6.0 mg/kg b.wt.) and sacrificed the animals at 1 h and 4 h. CPT activity showed a dose-dependent increase of up to 2.0 mg/kg b.wt. of CEES in both mitochondria and microsomes then decreased at 4.0 mg/kg b.wt. For further studies we used a fixed single dose of CEES (2.0 mg/kg b.wt.) and fixed exposure time (7 days). Lung injury was determined by measuring the leakage of iodinated-bovine serum albumin into lung tissue and expressed as the permeability index. CEES exposure (2.0 mg/kg b.wt. for 7 days) caused a significant decrease of both CPT gene expression (approximately 1.7-fold) and activity (approximately 1.5-fold) in the lung. This decrease in CPT activity was not associated with any mutation of the CPT gene. Previously we reported that CEES infusion increased the production of ceramides which are known to modulate PC synthesis. To determine whether ceramides affect microsomal CPT activity the lung microsomal fraction was incubated with different concentrations of C(2)-ceramide prior to CPT assay. CPT activity decreased significantly with increasing dose and time. The present study indicates that CEES causes lung injury and significantly decreases CPT gene expression and activity. This decrease in CPT activity was not associated with any mutation of the CPT gene is probably mediated by accumulation of ceramides. CEES induced ceramide accumulation may thus play an important role in the development of ARDS by modulating CPT enzyme.
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Affiliation(s)
- Somdutta Sinha Roy
- Department of Biochemistry, Meharry Medical College, 1005 David Todd Blvd, Nashville, TN 37208, USA
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19
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Xu Z, Zhou J, McCoy DM, Mallampalli RK. LASS5 is the predominant ceramide synthase isoform involved in de novo sphingolipid synthesis in lung epithelia. J Lipid Res 2005; 46:1229-38. [PMID: 15772421 DOI: 10.1194/jlr.m500001-jlr200] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Ceramide is a key bioactive mediator that inhibits surfactant phosphatidylcholine (PtdCho) synthesis in lung epithelia. Ceramide availability is governed by sphingomyelin (SM) hydrolysis, but less is known regarding its de novo synthesis. In this study, we observed that ceramide synthesis within murine lung epithelia was associated with high-level ceramide synthase (dihydroceramide synthase) activity. Longevity assurance homolog 5 (LASS5) was the predominant ceramide synthase isoform detected in lung epithelia, whereas relatively lower level expression was detected for the other five mammalian homologs. Pulmonary LASS5 was developmentally regulated, but its expression was spatially and gender nonspecific. Exogenously expressed LASS5 in lung epithelia was membrane-associated, triggering increased ceramide synthesis, whereas knockdown studies using fumonisin B1 or LASS5 small, interfering RNA reduced ceramide synthase activity by 78% or 45%, respectively. Overexpression of LASS5 also reduced PtdCho synthesis, but maximal inhibition was achieved when LASS5 was coexpressed with a plasmid encoding a neutral sphingomyelinase involved in SM hydrolysis. These results demonstrate that LASS5 is the major ceramide synthase gene product involved in sphingolipid production that may also regulate PtdCho metabolism in pulmonary epithelia.
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Affiliation(s)
- Zhiwei Xu
- Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
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20
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Jackowski S, Fagone P. CTP: Phosphocholine cytidylyltransferase: paving the way from gene to membrane. J Biol Chem 2004; 280:853-6. [PMID: 15536089 DOI: 10.1074/jbc.r400031200] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Suzanne Jackowski
- Protein Science Division, Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
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21
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van der Sanden MHM, Houweling M, Duijsings D, Vaandrager AB, van Golde LMG. Inhibition of phosphatidylcholine synthesis is not the primary pathway in hexadecylphosphocholine-induced apoptosis. Biochim Biophys Acta Mol Cell Biol Lipids 2004; 1636:99-107. [PMID: 15164757 DOI: 10.1016/j.bbalip.2003.08.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2003] [Revised: 08/22/2003] [Accepted: 08/25/2003] [Indexed: 11/20/2022]
Abstract
The anticancer drug hexadecylphosphocholine (HePC), an alkyl-lysophospholipid analog (ALP), has been shown to induce apoptosis and inhibit the synthesis of phosphatidylcholine (PC) in a number of cell lines. We investigated whether inhibition of PC synthesis plays a major causative role in the induction of apoptosis by HePC. We therefore directly compared the apoptosis caused by HePC in CHO cells to the apoptotic process in CHO-MT58 cells, which contain a genetic defect in PC synthesis. HePC-provoked apoptosis was found to differ substantially from the apoptosis observed in MT58 cells, since it was (i) not accompanied by a large decrease in the amount of PC and diacylglycerol (DAG), (ii) not preceded by induction of the pro-apoptotic protein GADD153/CHOP, and (iii) not dependent on the synthesis of new proteins. Furthermore, lysoPC as well as lysophosphatidylethanolamine (lysoPE) could antagonize the apoptosis induced by HePC, whereas only lysoPC was able to rescue MT58 cells. HePC also induced a rapid externalisation of phosphatidylserine (PS). These observations suggest that inhibition of PC synthesis is not the primary pathway in HePC-induced apoptosis.
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Affiliation(s)
- Michiel H M van der Sanden
- Department of Biochemistry and Cell Biology, Faculty of Veterinary Medicine, Institute of Biomembranes, Utrecht University, PO. Box 80176, 3508 TD Utrecht, The Netherlands
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22
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Birner R, Daum G. Biogenesis and cellular dynamics of aminoglycerophospholipids. INTERNATIONAL REVIEW OF CYTOLOGY 2003; 225:273-323. [PMID: 12696595 DOI: 10.1016/s0074-7696(05)25007-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Aminoglycerophospholipids phosphatidylserine (PtdSer), phosphatidylethanolamine (PtdEtn), and phosphatidylcholine (PtdCho) comprise about 80% of total cellular phospholipids in most cell types. While the major function of PtdCho in eukaryotes and PtdEtn in prokaryotes is that of bulk membrane lipids, PtdSer is a minor component and appears to play a more specialized role in the plasma membrane of eukaryotes, e.g., in cell recognition processes. All three aminoglycerophospholipid classes are essential in mammals, whereas prokaryotes and lower eukaryotes such as yeast appear to be more flexible regarding their aminoglycerophospholipid requirement. Since different subcellular compartments of eukaryotes, namely the endoplasmic reticulum and mitochondria, contribute to the biosynthetic sequence of aminoglycerophospholipid formation, intracellular transport, sorting, and specific function of these lipids in different organelles are of special interest.
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Affiliation(s)
- Ruth Birner
- Institut für Biochemie, Technische Universität Graz, Petersgasse 12/2, A-8010 Graz, Austria
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23
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van Blitterswijk WJ, van der Luit AH, Veldman RJ, Verheij M, Borst J. Ceramide: second messenger or modulator of membrane structure and dynamics? Biochem J 2003; 369:199-211. [PMID: 12408751 PMCID: PMC1223095 DOI: 10.1042/bj20021528] [Citation(s) in RCA: 335] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2002] [Revised: 10/30/2002] [Accepted: 10/31/2002] [Indexed: 12/18/2022]
Abstract
The physiological role of ceramide formation in response to cell stimulation remains controversial. Here, we emphasize that ceramide is not a priori an apoptotic signalling molecule. Recent work points out that the conversion of sphingomyelin into ceramide can play a membrane structural (physical) role, with consequences for membrane microdomain function, membrane vesiculation, fusion/fission and vesicular trafficking. These processes contribute to cellular signalling. At the Golgi, ceramide takes part in a metabolic flux towards sphingomyelin, diacylglycerol and glycosphingolipids, which drives lipid raft formation and vesicular transport towards the plasma membrane. At the cell surface, receptor clustering in lipid rafts and the formation of endosomes can be facilitated by transient ceramide formation. Also, signalling towards mitochondria may involve glycosphingolipid-containing vesicles. Ceramide may affect the permeability of the mitochondrial outer membrane and the release of cytochrome c. In the effector phase of apoptosis, the breakdown of plasma membrane sphingomyelin to ceramide is a consequence of lipid scrambling, and may regulate apoptotic body formation. Thus ceramide formation serves many different functions at distinct locations in the cell. Given the limited capacity for spontaneous intracellular diffusion or membrane flip-flop of natural ceramide species, the topology and membrane sidedness of ceramide generation are crucial determinants of its impact on cell biology.
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Affiliation(s)
- Wim J van Blitterswijk
- Division of Cellular Biochemistry, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.
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24
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Abstract
Phosphatidylcholine (PC) constitutes a major portion of cellular phospholipids and displays unique molecular species in different cell types and tissues. Inhibition of the CDP-choline pathway in most mammalian cells or overexpression of the hepatic phosphatidylethanolamine methylation pathway in hepatocytes leads to perturbation of PC homeostasis, growth arrest or even cell death. Although many agents that perturb PC homeostasis and induce cell death have been identified, the signaling pathways that mediate this cell death have not been well defined. This review summarizes recent progress in understanding the relationship between PC homeostasis and cell death.
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Affiliation(s)
- Zheng Cui
- Department of Pathology, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157-1016, USA.
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25
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Ramos B, El Mouedden M, Claro E, Jackowski S. Inhibition of CTP:phosphocholine cytidylyltransferase by C(2)-ceramide and its relationship to apoptosis. Mol Pharmacol 2002; 62:1068-75. [PMID: 12391269 DOI: 10.1124/mol.62.5.1068] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Apoptosis induced by antitumor phospholipid analogs takes place after the inhibition of the CTP:phosphocholine cytidylyltransferase (CCT; EC 2.7.7.15) catalyzed step of phosphatidylcholine (PtdCho) biosynthesis. Exposure of cells to synthetic short-chain ceramide analogs also triggers apoptosis concomitant with decreased PtdCho biosynthesis, and the present study was undertaken to ascertain whether C(2)-ceramide inhibition of PtdCho synthesis is direct or secondary to other ceramide-mediated cellular responses. The exposure of COS-7 cells to either C(2)-ceramide, ET-18-OCH(3), or farnesol resulted in time- and dose-dependent apoptotic cell death. Cells treated with C(2)-ceramide or ET-18-OCH(3) selectively and immediately accumulated phosphocholine, whereas CDP-choline increased with farnesol treatment. In vitro assays of CCT activity demonstrated that C(2)-ceramide directly inhibited CCT. Comparison of different N-linked sphingosine derivatives suggests an inverse relationship between the length of the N-linked carbon chain and the derivatives ability to trigger apoptosis and inhibit CCT. Taken together, our results suggest CCT as a primary target for C(2)-ceramide inhibition that accounts for its cytotoxic effects.
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Affiliation(s)
- Belén Ramos
- Departamento de Fisiología, Universidad de Extremadura, Cáceres, Spain
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26
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Vaandrager AB, Houweling M. Effect of ceramides on phospholipid biosynthesis and its implication for apoptosis. Subcell Biochem 2002; 36:207-27. [PMID: 12037983 DOI: 10.1007/0-306-47931-1_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Affiliation(s)
- Arie B Vaandrager
- Department of Biochemistry and Cell Biology, Faculty of Veterinary Medicine, University of Utrecht, P.O. Box 80176, 3508 TD Utrecht, The Netherlands
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27
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Vieu C, Tercé F, Chevy F, Rolland C, Barbaras R, Chap H, Wolf C, Perret B, Collet X. Coupled assay of sphingomyelin and ceramide molecular species by gas liquid chromatography. J Lipid Res 2002. [DOI: 10.1016/s0022-2275(20)30157-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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28
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Abstract
Citicoline (exogenous CDP-choline) is a nontoxic and well-tolerated drug used in pharmacotherapy of brain insufficiency and some other neurological disorders, such as stroke, brain trauma, and Parkinson's disease. A few reports indicate that citicoline treatment may also be beneficial in glaucoma. Currently glaucoma is considered a neurodegenerative disease in which retinal ganglion cells (RGC) slowly die, likely in the apoptotic mechanism. Endogenous CDP-choline is a natural precursor of cellular synthesis of phospholipids, mainly phosphatydylcholine (PtdCho). Enhancement of PtdCho synthesis may counteract neuronal apoptosis and provide neuroprotection. Citicoline, when administered, undergoes a quick transformation to cytidine and choline, which are believed to enter brain cells separately and provide neuroprotection by enhancing PtdCho synthesis; similar effect may be expected to occur in glaucomatous RGC. Furthermore, citicoline stimulates some brain neurotransmitter systems, including the dopaminergic system, and dopamine is known as a major neurotransmitter in retina and postretinal visual pathways. In a double-blind, placebo-controlled study, treatment of glaucoma resulted in functional improvement in the visual system noted with electrophysiological methods. Development of citicoline as a treatment for glaucoma is indicated.
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Affiliation(s)
- Pawel Grieb
- Laboratory of Experimental Pharmacology, Medical Research Center, Polish Academy of Sciences, Warsaw, Poland.
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29
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Vivekananda J, Smith D, King RJ. Sphingomyelin metabolites inhibit sphingomyelin synthase and CTP:phosphocholine cytidylyltransferase. Am J Physiol Lung Cell Mol Physiol 2001; 281:L98-L107. [PMID: 11404252 DOI: 10.1152/ajplung.2001.281.1.l98] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Tissue injury in inflammation involves the release of several cytokines that activate sphingomyelinases and generate ceramide. In the lung, the impaired metabolism of surfactant phosphatidylcholine (PC) accompanies this acute and chronic injury. These effects are long-lived and extend beyond the time frame over which tumor necrosis factor (TNF)-alpha and interleukin-1beta are elevated. In this paper, we demonstrate that in H441 lung cells these two processes, cytokine-induced metabolism of sphingomyelin and the inhibition of PC metabolism, are directly interrelated. First, metabolites of sphingomyelin hydrolysis themselves inhibit key enzymes necessary for restoring homeostasis between sphingomyelin and its metabolites. Ceramide stimulates sphingomyelinases as effectively as TNF-alpha, thereby amplifying the sphingomyelinase activation, and TNF-alpha, ceramide, and sphingosine all inhibit PC:ceramide phosphocholine transferase (sphingomyelin synthase), the enzyme that restores homeostasis between sphingomyelin and ceramide pools. Second, ceramide inhibits PC synthesis, probably because of its effects on CTP:phosphocholine cytidylyltransferase, the rate-limiting enzymatic step in de novo PC synthesis. The data presented here suggest that TNF-alpha may be an inhibitor of phospholipid metabolism in inflammatory tissue injury. These actions may be amplified because of the ability of metabolites of sphingomyelin to inhibit the pathways that should restore the normal ceramide-sphingomyelin homeostasis.
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Affiliation(s)
- J Vivekananda
- Department of Physiology, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229-3900, USA
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30
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Lykidis A, Jackowski S. Regulation of mammalian cell membrane biosynthesis. PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY 2000; 65:361-93. [PMID: 11008493 DOI: 10.1016/s0079-6603(00)65010-9] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
This review explores current information on the interrelationship between phospholipid biochemistry and cell biology. Phosphatidylcholine is the most abundant phospholipid and it biosynthesis has been studied extensively. The choline cytidylyltransferase regulates phosphatidylcholine production, and recent advances in our understanding of the mechanisms that govern cytidylyltransferase include the discovery of multiple isoforms and a more complete understanding of the lipid regulation of enzyme activity. Similarities between phosphatidylcholine formation and the phosphatidylethanolamine and phosphatidylinositol biosynthetic pathways are discussed, together with current insight into control mechanisms. Membrane phospholipid doubling during cell cycle progression is a function of periodic biosynthesis and degradation. Membrane homeostasis is maintained by a phospholipase A-mediated degradation of excess phospholipid, whereas insufficient phosphatidylcholine triggers apoptosis in cells.
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Affiliation(s)
- A Lykidis
- Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA
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Kolesnick RN, Goñi FM, Alonso A. Compartmentalization of ceramide signaling: physical foundations and biological effects. J Cell Physiol 2000; 184:285-300. [PMID: 10911359 DOI: 10.1002/1097-4652(200009)184:3<285::aid-jcp2>3.0.co;2-3] [Citation(s) in RCA: 349] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- R N Kolesnick
- Laboratory of Signal Transduction, Memorial Sloan-Kettering Cancer Center, New York, NY
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Mallampalli RK, Ryan AJ, Salome RG, Jackowski S. Tumor necrosis factor-alpha inhibits expression of CTP:phosphocholine cytidylyltransferase. J Biol Chem 2000; 275:9699-708. [PMID: 10734122 DOI: 10.1074/jbc.275.13.9699] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We investigated the effects of tumor necrosis factor alpha (TNFalpha), a key cytokine involved in inflammatory lung disease, on phosphatidylcholine (PtdCho) biosynthesis in a murine alveolar type II epithelial cell line (MLE-12). TNFalpha significantly inhibited [(3)H]choline incorporation into PtdCho after 24 h of exposure. TNFalpha reduced the activity of CTP:phosphocholine cytidylyltransferase (CCT), the rate-regulatory enzyme within the CDP-choline pathway, by 40% compared with control, but it did not alter activities of choline kinase or cholinephosphotransferase. Immunoblotting revealed that TNFalpha inhibition of CCT activity was associated with a uniform decrease in the mass of CCTalpha in total cell lysates, cytosolic, microsomal, and nuclear subfractions of MLE cells. Northern blotting revealed no effects of the cytokine on steady-state levels of CCTalpha mRNA, and CCTbeta mRNA was not detected. Incorporation of [(35)S]methionine into immunoprecipitable CCTalpha protein in pulse and pulse-chase studies revealed that TNFalpha did not alter de novo synthesis of enzyme, but it substantially accelerated turnover of CCTalpha. Addition of N-acetyl-Leu-Leu-Nle-CHO (ALLN), the calpain I inhibitor, or lactacystin, the 20 S proteasome inhibitor, blocked the inhibition of PtdCho biosynthesis mediated by TNFalpha. TNFalpha-induced degradation of CCTalpha protein was partially blocked by ALLN or lactacystin. CCT was ubiquitinated, and ubiquitination increased after TNFalpha exposure. m-Calpain degraded both purified CCT and CCT in cellular extracts. Thus, TNFalpha inhibits PtdCho synthesis by modulating CCT protein stability via the ubiquitin-proteasome and calpain-mediated proteolytic pathways.
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Affiliation(s)
- R K Mallampalli
- Department of Internal Medicine and the Department of Veterans Affairs Medical Center, the University of Iowa College of Medicine, Iowa City, Iowa 52242, USA.
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