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Zhou Q, Xie Z, He L, Sun G, Meng H, Luo Z, Feng Y, Chu X, Li L, Zhang J, Hao Y, Geng M, Zhang X, Chen S. Multi-omics profiling reveals peripheral blood biomarkers of multiple sclerosis: implications for diagnosis and stratification. Front Pharmacol 2024; 15:1458046. [PMID: 39257402 PMCID: PMC11384994 DOI: 10.3389/fphar.2024.1458046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2024] [Accepted: 08/12/2024] [Indexed: 09/12/2024] Open
Abstract
Background Multiple sclerosis (MS), a chronic autoimmune disorder marked by demyelination in the central nervous system, is exceptionally uncommon in China, and remains poorly understood in terms of its peripheral blood manifestations. Methods We conducted a cohort study comprising 39 MS patients and 40 normal controls (NC). High-dimensional mass cytometry, protein arrays, and targeted metabolomics were utilized to profile immune subsets, proteins, and metabolites in blood. Differences in multi-omics signatures were scrutinized across varying MS subtypes. Results Immune profiling demonstrated an elevation in various B cell subsets and monocytes, alongside a reduction in dendritic cells among MS patients. Proteomic data revealed a downregulation in neurotrophic and tissue repair proteins. Metabolomic assessment showed a noted decrease in anti-inflammatory molecules and sphingolipids. Integrated analysis identified distinct molecular patterns distinguishing MS from controls. Additionally, multi-omics differences among different MS subtypes were uncovered. Notably, hippuric acid levels was consistently lower in MS subgroups with greater disease severity. Conclusion This study represents the pioneering exploration of multi-omics in Chinese MS patients, presenting a comprehensive view of the peripheral blood changes in MS. Our study underscores the robust capability of multi-omics assessments in identifying peripheral blood biomarkers that delineate the varied clinical presentation, and facilitates future development of biomarkers and targeted therapeutic interventions in MS.
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Affiliation(s)
- Qinming Zhou
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
- Clinical Center for Rare Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zuoquan Xie
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Lu He
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Clinical Center for Rare Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Guangqiang Sun
- Shanghai Green Valley Pharmaceutical Co., Ltd, Shanghai, China
| | - Huanyu Meng
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Clinical Center for Rare Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhiyu Luo
- Shanghai Green Valley Pharmaceutical Co., Ltd, Shanghai, China
| | - Yuan Feng
- Shanghai Green Valley Pharmaceutical Co., Ltd, Shanghai, China
| | - Xingkun Chu
- Shanghai Green Valley Pharmaceutical Co., Ltd, Shanghai, China
| | - Liang Li
- Shanghai Green Valley Pharmaceutical Co., Ltd, Shanghai, China
| | - Jing Zhang
- Shanghai Green Valley Pharmaceutical Co., Ltd, Shanghai, China
| | - Yong Hao
- Departement of Neurology, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Meiyu Geng
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong, China
| | - Xiang Zhang
- Department of Neurology, Huashan Hospital Fudan University and Institute of Neurology, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Sheng Chen
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
- Clinical Center for Rare Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Ray SK, Dasgupta S. Chromatographic Separation and Quantitation of Sphingolipids from the Central Nervous System or Any Other Biological Tissue. Methods Mol Biol 2024; 2761:149-157. [PMID: 38427236 DOI: 10.1007/978-1-0716-3662-6_12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
Chromatographic separation and purification of an individual lipid to homogeneity have long been introduced. Using this concept, a more precise method has been developed to identify and characterize the sphingolipid composition(s) using a small amount (30 mg) of biological sample. Sphingolipids (lipids containing sphingosine or dihydrosphingosine) are well-known regulators of the central nervous system development and play a critical role in neurodegenerative diseases. Introducing a silicic acid column chromatography, sphingolipid components have been separated to individual fractions such as ceramide, glucosyl/galactosylceramide, other neutral and acidic glycosphingolipids, including (dihydro)sphingosine and psychosine; as well as phospholipids from which individual components are quantified employing a single or combination of other advanced chromatography procedures such as thin-layer chromatography, gas chromatography-mass spectrometry, and high-performance liquid chromatography-mass spectrometry.
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Affiliation(s)
- Swapan K Ray
- Department of Pathology, Microbiology, and Immunology, University of South Carolina School of Medicine, Columbia, SC, USA.
| | - Somsankar Dasgupta
- Department of Neuroscience and Regenerative Medicine, Institute of Molecular Medicine and Genetics, Augusta University, Augusta, GA, USA
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3
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Engel KM, Schiller J. The value of coupling thin-layer chromatography to mass spectrometry in lipid research - a review. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1185:123001. [PMID: 34715571 DOI: 10.1016/j.jchromb.2021.123001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 10/12/2021] [Accepted: 10/14/2021] [Indexed: 12/18/2022]
Abstract
Mass spectrometry has emerged as an extremely powerful analytical tool, which is widely used in many fields. This broad application range became possible with the invention of MALDI and ESI as "soft ionization" techniques that keep fragmentation of the analyte to a minimum. However, when these techniques are applied to mixture analysis, less-sensitively detectable compounds may be suppressed by more sensitively detectable compounds, a process called "ion suppression". Thus, previous separation of the mixture into the individual lipid classes is necessary to be able to detect all compounds. This review summarizes the current knowledge in the field of combined TLC/MS and discusses the most important strengths and weaknesses of the different MS (particularly ionization) techniques with respect to phospholipids. This comprises techniques such as MALDI and ESI, but less established approaches such as plasma desorption will be also discussed.
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Affiliation(s)
- Kathrin M Engel
- Leipzig University, Medical Faculty, Institute for Medical Physics and Biophysics, Germany.
| | - Jürgen Schiller
- Leipzig University, Medical Faculty, Institute for Medical Physics and Biophysics, Germany
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4
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Dasgupta S, Ray SK. Ceramide and Sphingosine Regulation of Myelinogenesis: Targeting Serine Palmitoyltransferase Using microRNA in Multiple Sclerosis. Int J Mol Sci 2019; 20:E5031. [PMID: 31614447 PMCID: PMC6834223 DOI: 10.3390/ijms20205031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 09/30/2019] [Accepted: 10/09/2019] [Indexed: 12/13/2022] Open
Abstract
Ceramide and sphingosine display a unique profile during brain development, indicating their critical role in myelinogenesis. Employing advanced technology such as gas chromatography-mass spectrometry, high performance liquid chromatography, and immunocytochemistry, along with cell culture and molecular biology, we have found an accumulation of sphingosine in brain tissues of patients with multiple sclerosis (MS) and in the spinal cord of rats induced with experimental autoimmune encephalomyelitis. The elevated sphingosine leads to oligodendrocyte death and fosters demyelination. Ceramide elevation by serine palmitoyltransferse (SPT) activation was the primary source of the sphingosine elevation as myriocin, an inhibitor of SPT, prevented sphingosine elevation and protected oligodendrocytes. Supporting this view, fingolimod, a drug used for MS therapy, reduced ceramide generation, thus offering partial protection to oligodendrocytes. Sphingolipid synthesis and degradation in normal development is regulated by a series of microRNAs (miRNAs), and hence, accumulation of sphingosine in MS may be prevented by employing miRNA technology. This review will discuss the current knowledge of ceramide and sphingosine metabolism (synthesis and breakdown), and how their biosynthesis can be regulated by miRNA, which can be used as a therapeutic approach for MS.
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Affiliation(s)
- Somsankar Dasgupta
- Department of Neuroscience and Regenerative Medicine, Augusta University, 1120 15th Street, Augusta, GA 30912, USA.
| | - Swapan K Ray
- Department of Pathology, Microbiology, and Immunology, University of South Carolina School of Medicine, 6439 Garners Ferry Road, Columbia, SC 29209, USA.
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5
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Chai T, Cui F, Song Y, Ye L, Li T, Qiu J, Liu X. Enantioselective Toxicity in Adult Zebrafish ( Danio rerio) Induced by Chiral PCB91 through Multiple Pathways. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:5448-5458. [PMID: 29641891 DOI: 10.1021/acs.est.8b00023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study aimed to further investigate the toxic mechanism of chiral polychlorinated biphenyl (PCB) 91 in adult zebrafish ( Danio rerio) exposed to racemic (rac-), (+)-, or (-)-PCB91 for 63 days. The enantioselective mortalities of adult zebrafish exposed to rac-/(+)-/(-)-PCB91 were 95.86, 50.08, and 81.50%, respectively. Tubular necrosis and cellular hypertrophy occurred in the kidneys of (-)-PCB91-treated groups, whereas demyelination and immune cell infiltration occurred in brains of the rac-, (+)-, and (-)-PCB91-treated groups. Additionally, exposure to chiral PCB91 enantioselectively induced neurotoxicity, apoptosis, and inflammation in brain tissues owing to perturbations of gene expression, protein content and sphingolipid levels. The high mortality after rac-/(+)-PCB91 exposure might be due to toxic effects on brain tissue, while the high mortality after (-)-PCB91 exposure might be due to toxic effects on kidney as well as brain tissues. Thus, our findings offer an important reference for elucidating the enantioselective toxicological mechanism of chiral PCBs in aquatic organisms.
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Affiliation(s)
- Tingting Chai
- Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province, College of Agriculture and Food Science , Zhejiang A & F University , Lin'an , Zhejiang 311300 , P.R. China
| | - Feng Cui
- Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province, College of Agriculture and Food Science , Zhejiang A & F University , Lin'an , Zhejiang 311300 , P.R. China
| | - Yue Song
- Institute of Quality Standards & Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety , Chinese Academy of Agricultural Sciences and Key Laboratory of Agri-food Quality and Safety, Ministry of Agriculture , Beijing 100081 , China
| | - Linlin Ye
- Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province, College of Agriculture and Food Science , Zhejiang A & F University , Lin'an , Zhejiang 311300 , P.R. China
| | - Tiantian Li
- Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province, College of Agriculture and Food Science , Zhejiang A & F University , Lin'an , Zhejiang 311300 , P.R. China
| | - Jing Qiu
- Institute of Quality Standards & Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety , Chinese Academy of Agricultural Sciences and Key Laboratory of Agri-food Quality and Safety, Ministry of Agriculture , Beijing 100081 , China
| | - Xingquan Liu
- Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province, College of Agriculture and Food Science , Zhejiang A & F University , Lin'an , Zhejiang 311300 , P.R. China
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6
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The role of sphingolipids in psychoactive drug use and addiction. J Neural Transm (Vienna) 2018; 125:651-672. [DOI: 10.1007/s00702-018-1840-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 01/03/2018] [Indexed: 12/14/2022]
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7
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Miller LG, Young JA, Ray SK, Wang G, Purohit S, Banik NL, Dasgupta S. Sphingosine Toxicity in EAE and MS: Evidence for Ceramide Generation via Serine-Palmitoyltransferase Activation. Neurochem Res 2017; 42:2755-2768. [PMID: 28474276 DOI: 10.1007/s11064-017-2280-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 04/07/2017] [Accepted: 04/22/2017] [Indexed: 12/12/2022]
Abstract
Multiple sclerosis (MS) is a demyelinating disorder characterized by massive neurodegeneration and profound axonal loss. Since myelin is enriched with sphingolipids and some of them display toxicity, biological function of sphingolipids in demyelination has been investigated in MS brain tissues. An elevation of sphingosine with a decrease in monoglycosylceramide and psychosine (myelin markers) was observed in MS white matter and plaque compared to normal brain tissue. This indicated that sphingosine toxicity might mediate oligodendrocyte degeneration. To explain the source of sphingosine accumulation, total sphingolipid profile was investigated in Lewis rats after inducing experimental autoimmune encephalomyelitis (EAE) and also in human oligodendrocytes in culture. An intermittent increase in ceramide followed by sphingosine accumulation in EAE spinal cord along with a stimulation of serine-palmitoyltransferase (SPT) activity was observed. Apoptosis was identified in the lumbar spinal cord, the most prominent demyelinating area, in the EAE rats. TNFα and IFNγ stimulation of oligodendrocytes in culture also led to an accumulation of ceramide with an elevation of sphingosine. Ceramide elevation was drastically blocked by myriocin, an inhibitor of SPT, and also by FTY720. Myriocin treatment also protected oligodendrocytes from cytokine mediated apoptosis or programmed cell death. Hence, we propose that sphingosine toxicity may contribute to demyelination in both EAE and MS, and the intermittent ceramide accumulation in EAE may, at least partly, be mediated via SPT activation, which is a novel observation that has not been previously reported.
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Affiliation(s)
- Lawrence G Miller
- Department of Neurology and Neurosurgery, Medical University of South Carolina, 96 Jonathan Lucas Street, Charleston, SC, 29425, USA
| | - Jennifer A Young
- Department of Neurology and Neurosurgery, Medical University of South Carolina, 96 Jonathan Lucas Street, Charleston, SC, 29425, USA
| | - Swapan K Ray
- Department of Pathology, Microbiology, and Immunology, University of South Carolina School of Medicine, 6439 Garners Ferry Road, Columbia, SC, 29209, USA
| | - Guanghu Wang
- Institute of Molecular Medicine and Genetics, Augusta University, 1120 15th Street, Augusta, GA, 30912, USA
| | - Sharad Purohit
- Center for Biotechnology and Genomic Medicine, Augusta University, 1120 15th Street, Augusta, GA, 30912, USA
| | - Naren L Banik
- Department of Neurology and Neurosurgery, Medical University of South Carolina, 96 Jonathan Lucas Street, Charleston, SC, 29425, USA
| | - Somsankar Dasgupta
- Institute of Molecular Medicine and Genetics, Augusta University, 1120 15th Street, Augusta, GA, 30912, USA.
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8
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Antineoplastic impact of leishmanial sphingolipid in tumour growth with regulation of angiogenic event and inflammatory response. Apoptosis 2015; 20:869-82. [DOI: 10.1007/s10495-015-1121-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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9
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Trapp MA, Kai M, Mithöfer A, Rodrigues-Filho E. Antibiotic oxylipins from Alternanthera brasiliana and its endophytic bacteria. PHYTOCHEMISTRY 2015; 110:72-82. [PMID: 25433629 DOI: 10.1016/j.phytochem.2014.11.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 10/11/2014] [Accepted: 11/04/2014] [Indexed: 06/04/2023]
Abstract
Bioassay-guided fractionation of Alternanthera brasiliana stem extracts resulted in the isolation of an antibiotically active fraction. Five human pathogenic bacteria were used to guide the fractionation process for the isolation of antimicrobial compounds. Finally, 17 linoleate oxylipins were identified by LC-MS/MS and NMR spectroscopy. Five of the isolated compounds present in A. brasiliana tissues were also detected to be synthesized by endophytic bacteria of the genus Bacillus that were isolated from A. brasiliana. It is speculated that the antibiotic oxylipins from A. brasiliana might derive from bacteria and be involved in an ecological relationship between this plant and its endophytes.
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Affiliation(s)
- Marília Almeida Trapp
- LaBioMMi, Federal University of São Carlos, Rodovia Washington Luiz, km 235, CP 676, São Carlos - SP 13.565-905, Brazil; Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, Jena, Germany.
| | - Marco Kai
- Research Group of Mass Spectrometry/Proteomics, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, Jena, Germany
| | - Axel Mithöfer
- Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, Jena, Germany
| | - Edson Rodrigues-Filho
- LaBioMMi, Federal University of São Carlos, Rodovia Washington Luiz, km 235, CP 676, São Carlos - SP 13.565-905, Brazil
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Das S, Chatterjee N, Bose D, Banerjee S, Jha T, Saha KD. Leishmanial sphingolipid induces apoptosis in Sarcoma 180 cancer cells through regulation of tumour growth via angiogenic switchover. Tumour Biol 2014; 36:3109-18. [DOI: 10.1007/s13277-014-2947-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 12/04/2014] [Indexed: 01/29/2023] Open
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11
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Chen W, Zhou H, Saha P, Li L, Chan L. Molecular mechanisms underlying fasting modulated liver insulin sensitivity and metabolism in male lipodystrophic Bscl2/Seipin-deficient mice. Endocrinology 2014; 155:4215-25. [PMID: 25093462 PMCID: PMC4197977 DOI: 10.1210/en.2014-1292] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Bscl2(-/-) mice recapitulate many of the major metabolic manifestations in Berardinelli-Seip congenital lipodystrophy type 2 (BSCL2) individuals, including lipodystrophy, hepatomegly, hepatic steatosis, and insulin resistance. The mechanisms that underlie hepatic steatosis and insulin resistance in Bscl2(-/-) mice are poorly understood. To address this issue, we performed hyperinsulinemic-euglycemic clamp on Bscl2(-/-) and wild-type mice after an overnight (16-h) fast, and found that Bscl2(-/-) actually displayed increased hepatic insulin sensitivity. Interestingly, liver in Bscl2(-/-) mice after a short term (4-h) fast had impaired acute insulin signaling, a defect that disappeared after a 16-hour fast. Notably, fasting-dependent hepatic insulin signaling in Bscl2(-/-) mice was not associated with liver diacylglyceride and ceramide contents, but could be attributable in part to the expression of hepatic insulin signaling receptor and substrates. Meanwhile, increased de novo lipogenesis and decreased β-oxidation led to severe hepatic steatosis in fed or short-fasted Bscl2(-/-) mice whereas liver lipid accumulation and metabolism in Bscl2(-/-) mice was markedly affected by prolonged fasting. Furthermore, mice with liver-specific inactivation of Bscl2 manifested no hepatic steatosis even under high-fat diet, suggesting Bscl2 does not play a cell autonomous role in regulating liver lipid homeostasis. Overall, our results offered new insights into the metabolic adaptations of liver in response to fasting and uncovered a novel fasting-dependent regulation of hepatic insulin signaling in a mouse model of human BSCL2.
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Affiliation(s)
- Weiqin Chen
- Department of Physiology (W.C., H.Z.), Medical College of Georgia at Georgia Regents University, Augusta, Georgia 30912; and Diabetes and Endocrinology Research Center, Division of Diabetes, Endocrinology and Metabolism, Departments of Medicine (P.S., L.L., L.C.), Molecular and Cellular Biology (L.C.), and Biochemistry, Baylor College of Medicine (L.C.), and St. Luke's Medical Center (L.C.), Houston, Texas 77030
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12
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Dinkins MB, Dasgupta S, Wang G, Zhu G, Bieberich E. Exosome reduction in vivo is associated with lower amyloid plaque load in the 5XFAD mouse model of Alzheimer's disease. Neurobiol Aging 2014; 35:1792-800. [PMID: 24650793 DOI: 10.1016/j.neurobiolaging.2014.02.012] [Citation(s) in RCA: 342] [Impact Index Per Article: 34.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 02/06/2014] [Accepted: 02/10/2014] [Indexed: 11/19/2022]
Abstract
We present evidence here that exosomes stimulate aggregation of amyloid beta (Aβ)1-42 in vitro and in vivo and interfere with uptake of Aβ by primary cultured astrocytes and microglia in vitro. Exosome secretion is prevented by the inhibition of neutral sphingomyelinase 2 (nSMase2), a key regulatory enzyme generating ceramide from sphingomyelin, with GW4869. Using the 5XFAD mouse, we show that intraperitoneal injection of GW4869 reduces the levels of brain and serum exosomes, brain ceramide, and Aβ1-42 plaque load. Reduction of total Aβ1-42 as well as number of plaques in brain sections was significantly greater (40% reduction) in male than female mice. Our results suggest that GW4869 reduces amyloid plaque formation in vivo by preventing exosome secretion and identifies nSMase2 as a potential drug target in AD by interfering with exosome secretion.
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Affiliation(s)
- Michael B Dinkins
- Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, GA, USA
| | - Somsankar Dasgupta
- Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, GA, USA
| | - Guanghu Wang
- Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, GA, USA
| | - Gu Zhu
- Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, GA, USA
| | - Erhard Bieberich
- Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, GA, USA.
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Dasgupta S, Kong J, Bieberich E. Phytoceramide in vertebrate tissues: one step chromatography separation for molecular characterization of ceramide species. PLoS One 2013; 8:e80841. [PMID: 24312247 PMCID: PMC3843679 DOI: 10.1371/journal.pone.0080841] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 10/15/2013] [Indexed: 11/19/2022] Open
Abstract
Ceramide is a precursor for complex sphingolipids in vertebrates, while plants contain phytoceramide. By using a novel chromatography purification method we show that phytoceramide comprises a significant proportion of animal sphingolipids. Total ceramide including phytoceramide from mouse tissue (brain, heart, liver) lipid extracts and cell culture (mouse primary astrocytes, human oligodendroglioma cells) was eluted as a single homogenous fraction, and then analyzed by thin layer chromatography, and further characterized by gas chromatography-mass spectrometry (GC-MS). We detected a unique band that migrated between non-hydroxy fatty acyl ceramide and hydroxy fatty acyl ceramide, and identified it as phytoceramide. Using RT-PCR, we confirmed that mouse tissues expressed desaturase 2, an enzyme that has been reported to generate phytoceramide from dihydroceramide. Previously, only trace amounts of phytoceramide were reported in vertebrate intestine, kidney, and skin. While its function is still elusive, this is the first report of phytoceramide characterization in glial cells and vertebrate brain, heart, and liver.
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Affiliation(s)
- Somsankar Dasgupta
- Program in Developmental Neurobiology, Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, Georgia, United States of America
| | - Jina Kong
- Program in Developmental Neurobiology, Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, Georgia, United States of America
| | - Erhard Bieberich
- Program in Developmental Neurobiology, Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, Georgia, United States of America
- * E-mail:
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Liu KX, He W, Rinne T, Liu Y, Zhao MQ, Wu WK. The Effect ofGinkgo bilobaExtract (EGb 761) Pretreatment on Intestinal Epithelial Apoptosis Induced by Intestinal Ischemia/Reperfusion in Rats: Role of Ceramide. THE AMERICAN JOURNAL OF CHINESE MEDICINE 2012; 35:805-19. [PMID: 17963320 DOI: 10.1142/s0192415x07005284] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Apoptosis was demonstrated to be a major mode of intestinal epithelial cell death caused by intestinal ischemia/reperfusion ( II / R ). Ceramide has been proposed as a messenger for apoptosis. The present study was aimed to investigate the effect of Ginkgo biloba extract 761 (EGb 761) pretreatment on II / R -induced intestinal mucosal epithelial apoptosis in rats and the mechanism related to ceramide. The rat model of II / R injury was produced by clamping superior mesenteric artery for 60 min followed by reperfusion for 180 min. Twenty four rats were randomly allocated into Sham, II / R and EGb + II / R groups. In EGb + II / R group, EGb 761 (100 mg/kg per day) was administered intragastrically for 7 days before the surgery. Animals in II / R and sham groups were treated with equal volume of normal saline solution. Intestinal mucosal epithelial apoptosis was detected via electron microscopy and TUNEL method. Lipid peroxidation in intestinal mucosa was determined by detecting the malondialdehyde level and the activities of superoxide dismutase and peroxidase glutathione. The ceramide generation and sphingomyelinase (SMase) mRNA expression in intestinal mucosa were determined by high performance, thin layer chromatography, and RT-PCR, respectively. II / R caused intestinal mucosal epithelial apoptosis and over-production of the ceramide accompanied by up-regulation of SMase mRNA expression and increases of lipid peroxidation. EGb 761 pretreatment significantly decreased apoptosis index, and concurrently reduced the ceramide generation accompanied by down-regulation of SMase expression and inhibition of lipid peroxidation. The findings indicate that EGb 761 pretreatment attenuates II / R -induced intestinal epithelial apoptosis, which might be attributable to its antioxidant action of mediating ceramide pathway.
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Affiliation(s)
- Ke-Xuan Liu
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Wei He
- Department of Anesthesiology, Guangdong Provincial People's Hospital, Guangzhou 510080, China
| | - Timo Rinne
- Division of Anaesthesia, Heart Center, Tampere University Hospital, Tampere 33521, Finland
| | - Ying Liu
- The Institute of Integrated Traditional Chinese Medicine and Western Medicine, Sun Yat-Sen University, Guangzhou 510080, China
| | - Ming-Qi Zhao
- The Institute of Integrated Traditional Chinese Medicine and Western Medicine, Sun Yat-Sen University, Guangzhou 510080, China
| | - Wei-Kang Wu
- The Institute of Integrated Traditional Chinese Medicine and Western Medicine, Sun Yat-Sen University, Guangzhou 510080, China
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Reich A, Schwudke D, Meurer M, Lehmann B, Shevchenko A. Lipidome of narrow-band ultraviolet B irradiated keratinocytes shows apoptotic hallmarks. Exp Dermatol 2011; 19:e103-10. [PMID: 19845761 DOI: 10.1111/j.1600-0625.2009.01000.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND UV light triggers a variety of biological responses in irradiated keratinocytes that might be associated with global perturbation of their lipidome. However, lipids that are specifically affected and the exact molecular mechanisms involved remain poorly understood. OBJECTIVES To characterize time-dependent changes of the lipidome of cultured keratinocytes induced by narrow-band ultraviolet B (NB-UVB) irradiation. METHODS Immortalized human keratinocytes (HaCaT) were cultured under standard conditions, irradiated with NB-UVB light (311 nm) at 400 and 800 mJ/cm(2) and collected 1, 2, 3, 6, 12 and 24 h later for lipid extraction. Lipid extracts were separated on silica plates in chloroform/ethanol/water/triethylamine (35:40:9:35) and in n-hexane/ethylacetate (5:1) followed by quantitative shotgun lipidomics analysis. RESULTS Irradiation with 800 mJ/cm(2) of NB-UVB altered morphology and lipidome composition of HaCaT cells. Ceramide content increased two-fold 6- and 12-h postirradiation with 800 mJ/cm(2), followed by threefold increase in triacylglycerols (TAGs) that peaked at 24 h. In addition, we observed marked increase of various phosphatidylcholine and phosphatidylethanolamine ethers, whereas phosphatidylcholine-species with short-chain fatty acid moieties decreased. The abundance of other lipid species was altered to lesser extent or remained unchanged. CONCLUSIONS NB-UVB affected the cellular lipidome of keratinocytes in strictly apoptosis-specific manner.
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Affiliation(s)
- Adam Reich
- Department of Dermatology, Venereology and Allergology, Wroclaw Medical University, Wroclaw, Poland.
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Selective extraction and effective separation of galactosylsphingosine (psychosine) and glucosylsphingosine from other glycosphingolipids in pathological tissue samples. Neurochem Res 2010; 36:1612-22. [PMID: 21136152 DOI: 10.1007/s11064-010-0348-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/23/2010] [Indexed: 10/18/2022]
Abstract
To facilitate the study of the chemical pathology of galactosylsphingosine (psychosine, GalSph) in Krabbe disease and glucosylsphingosine (GlcSph) in Gaucher disease, we have devised a facile method for the effective separation of these two glycosylsphingosines from other glycosphingolipids (GSLs) in Krabbe brain and Gaucher spleen samples. The procedure involves the use of acetone to selectively extract GalSph and GlcSph, respectively, from Krabbe brain and Gaucher spleen samples. Since acetone does not extract other GSLs except modest amounts of galactosylceramide, sulfatide, and glucosylceramide, the positively charged GalSph or GlcSph in the acetone extract can be readily separated from other GSLs by batchwise cation-exchange chromatography using a Waters Accell Plus CM Cartridge. GalSph or GlcSph enriched by this simple procedure can be readily analyzed by thin-layer chromatography or high-performance liquid chromatography.
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17
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te Vruchte D, Jeans A, Platt FM, Sillence DJ. Glycosphingolipid storage leads to the enhanced degradation of the B cell receptor in Sandhoff disease mice. J Inherit Metab Dis 2010; 33:261-70. [PMID: 20458542 PMCID: PMC3779831 DOI: 10.1007/s10545-010-9109-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2010] [Revised: 03/29/2010] [Accepted: 04/12/2010] [Indexed: 12/11/2022]
Abstract
Glycosphingolipid storage diseases are a group of inherited metabolic diseases in which glycosphingolipids accumulate due to their impaired lysosomal breakdown. Splenic B cells isolated from NPC1, Sandhoff, GM1-gangliosidosis and Fabry disease mouse models showed large (20- to 30-fold) increases in disease specific glycosphingolipids and up to a 4-fold increase in cholesterol. The magnitude of glycosphingolipid storage was in the order NPC1 > Sandhoff approximately GM1 gangliosidosis > Fabry. Except for Fabry disease, glycosphingolipid storage led to an increase in the lysosomal compartment and altered glycosphingolipid trafficking. In order to investigate the consequences of storage on B cell function, the levels of surface expression of B cell IgM receptor and its associated components were quantitated in Sandhoff B cells, since they are all raft-associated on activation. Both the B cell receptor, CD21 and CD19 had decreased cell surface expression. In contrast, CD40 and MHC II, surface receptors that do not associate with lipid rafts, were unchanged. Using a pulse chase biotinylation procedure, surface B cell receptors on a Sandhoff lymphoblast cell line were found to have a significantly decreased half-life. Increased co-localization of fluorescently conjugated cholera toxin and lysosomes was also observed in Sandhoff B cells. Glycosphingolipid storage leads to the enhanced formation of lysosomal lipid rafts, altered endocytic trafficking and increased degradation of the B cell receptor.
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Affiliation(s)
- Danielle te Vruchte
- Department of Pharmacology, University of Oxford, Mansfield Road, Oxford, UK
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Haynes CA, Allegood JC, Park H, Sullards MC. Sphingolipidomics: methods for the comprehensive analysis of sphingolipids. J Chromatogr B Analyt Technol Biomed Life Sci 2009; 877:2696-708. [PMID: 19147416 PMCID: PMC2765038 DOI: 10.1016/j.jchromb.2008.12.057] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2008] [Revised: 12/23/2008] [Accepted: 12/24/2008] [Indexed: 01/04/2023]
Abstract
Sphingolipids comprise a highly diverse and complex class of molecules that serve as both structural components of cellular membranes and signaling molecules capable of eliciting apoptosis, differentiation, chemotaxis, and other responses in mammalian cells. Comprehensive or "sphingolipidomic" analyses (structure specific, quantitative analyses of all sphingolipids, or at least all members of a critical subset) are required in order to elucidate the role(s) of sphingolipids in a given biological context because so many of the sphingolipids in a biological system are inter-converted structurally and metabolically. Despite the experimental challenges posed by the diversity of sphingolipid-regulated cellular responses, the detection and quantitation of multiple sphingolipids in a single sample has been made possible by combining classical analytical separation techniques such as high-performance liquid chromatography (HPLC) with state-of-the-art tandem mass spectrometry (MS/MS) techniques. As part of the Lipid MAPS consortium an internal standard cocktail was developed that comprises the signaling metabolites (i.e. sphingoid bases, sphingoid base-1-phosphates, ceramides, and ceramide-1-phosphates) as well as more complex species such as mono- and di-hexosylceramides and sphingomyelin. Additionally, the number of species that can be analyzed is growing rapidly with the addition of fatty acyl Co-As, sulfatides, and other complex sphingolipids as more internal standards are becoming available. The resulting LC-MS/MS analyses are one of the most analytically rigorous technologies that can provide the necessary sensitivity, structural specificity, and quantitative precision with high-throughput for "sphingolipidomic" analyses in small sample quantities. This review summarizes historical and state-of-the-art analytical techniques used for the identification, structure determination, and quantitation of sphingolipids from free sphingoid bases through more complex sphingolipids such as sphingomyelins, lactosylceramides, and sulfatides including those intermediates currently considered sphingolipid "second messengers". Also discussed are some emerging techniques and other issues remaining to be resolved for the analysis of the full sphingolipidome.
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Affiliation(s)
- Christopher A. Haynes
- School of Biology, Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332-0363, U.S.A
| | - Jeremy C. Allegood
- Department of Biochemistry and Molecular Biology, Virginia Commonwealth University School of Medicine, Richmond, VA 23298-5048, U.S.A
| | - Hyejung Park
- School of Biology, Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332-0363, U.S.A
| | - M. Cameron Sullards
- School of Biology, Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332-0363, U.S.A
- School of Chemistry & Biochemistry, Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332-0363, U.S.A
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19
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Liu KX, Chen SQ, Huang WQ, Li YS, Irwin MG, Xia Z. Propofol pretreatment reduces ceramide production and attenuates intestinal mucosal apoptosis induced by intestinal ischemia/reperfusion in rats. Anesth Analg 2008; 107:1884-91. [PMID: 19020134 DOI: 10.1213/ane.0b013e3181884bbf] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Apoptosis has been shown to be a major mode of intestinal epithelial cell death caused by intestinal ischemia/reperfusion (II/R), a condition that is associated with increased oxidative stress. Ceramide has been proposed as a messenger of apoptosis. We investigated if pretreatment with propofol, an anesthetic with antioxidant properties, could reduce ceramide production, and consequently, mucosal epithelial apoptosis induced by II/R in rats. METHODS Rat II/R injury was produced by clamping the superior mesenteric artery for 1 h followed by 3 h of reperfusion. Thirty rats were randomly allocated into control, injury (II/R) and propofol (pretreatment) groups (n = 10 per group). In the propofol group, propofol 50 mg/kg, a dose that has been shown to cause the loss of reflex responses to a painful stimulus while remaining sensitive to skin incision in rats, was administered intraperitoneally 30 min before inducing intestinal ischemia, while animals in control and untreated injury groups received an equal volume of intralipid. Intestinal mucosal epithelial apoptosis was detected via electron microscopy and TUNEL analysis. Lipid oxidation product malondialdehyde and the activities of superoxide dismutase were assessed by colorimetric analyses. Ceramide generation and sphingomyelinase mRNA expression in intestinal mucosa were determined by high performance thin layer chromatography and reverse transcriptase polymerase chain reaction, respectively. RESULTS II/R caused intestinal mucosal epithelial apoptosis and over-production of ceramide accompanied by up-regulation of sphingomyelinase mRNA expression and increases in lipid oxidation (all P < 0.01 versus control). Propofol pretreatment significantly attenuated these changes (all P < 0.01, propofol versus injury). CONCLUSION The findings indicate that propofol pretreatment attenuates II/R-induced intestinal epithelial apoptosis, which might be attributable to its antioxidant property modulating the ceramide pathway.
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Affiliation(s)
- Ke-Xuan Liu
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, No.58, Zhongshan 2th Rd., Guangzhou, China, 510080.
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20
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Jiang X, Yang K, Han X. Direct quantitation of psychosine from alkaline-treated lipid extracts with a semi-synthetic internal standard. J Lipid Res 2008; 50:162-72. [PMID: 18753677 DOI: 10.1194/jlr.d800036-jlr200] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Psychosine is an important bioactive sphingolipid metabolite and plays an essential role in the pathogenesis of Krabbe's disease. Herein, we extended shotgun lipidomics for the characterization and quantitation of psychosine in alkaline-treated crude lipid extracts by using neutral loss scan of 180 amicro (i.e., galactose) in the positive-ion mode. Specifically, we semi-synthesized N,N-dimethyl psychosine and used it as an internal standard for quantitation of psychosine. After characterization of the fragmentation patterns of psychosine and the selected internal standard and optimization of the experimental conditions, we demonstrated that a broad linear dynamic range for the quantitation of psychosine and a limit of detection at a concentration of low fmol/microl were achieved using this approach. The developed method is generally simpler and more efficient than other previously reported methods. Multiple factors influencing quantitation of psychosine were extensively examined and/or discussed. The levels of psychosine in diabetic mouse nerve tissue samples were determined by the developed methodology. Collectively, the developed approach, as a new addition to the shotgun lipidomics technology, will be extremely useful for understanding the pathways/networks of sphingolipid metabolism and for exploring the important roles of psychosine in a variety of physiological and pathological conditions.
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Affiliation(s)
- Xuntian Jiang
- Division of Bioorganic Chemistry and Molecular Pharmacology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
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21
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Radin MJ, Holycross BJ, Dumitrescu C, Kelley R, Altschuld RA. Leptin modulates the negative inotropic effect of interleukin-1beta in cardiac myocytes. Mol Cell Biochem 2008; 315:179-84. [PMID: 18535786 DOI: 10.1007/s11010-008-9805-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2008] [Accepted: 05/23/2008] [Indexed: 02/07/2023]
Abstract
Interleukin-1beta (IL-1beta) is a potent negative inotrope implicated in the functional abnormalities of heart failure. Because the adipokine, leptin, protects against some of the cardiovascular effects of endotoxin, we hypothesized that leptin may modulate the cardiosuppressive effects of IL-1beta in isolated cardiomyocytes. Ventricular cardiac myocytes isolated from adult male Sprague Dawley rats were analyzed simultaneously for electrically stimulated contractility and calcium transients following 30 min exposure to IL-1beta (10 ng/ml) with or without 60 min pretreatment with leptin (25 ng/ml). IL-1beta decreased cell shortening, depressed maximal velocities of shortening and relengthening, and prolonged the time to 90% relaxation. The change in fura2-AM fluorescence ratio amplitude (Delta[Ca(2+)]) was significantly depressed and the time to return to baseline [Ca(2+)] was prolonged. The negative inotropic effects of IL-1beta were blocked by the neutral sphingomyelinase inhibitor Manumycin A (5 microM) or the ceramidase inhibitor N-oleoyl ethanolamine (1 microM). Prior exposure of myocytes to leptin blocked IL-1beta-induced cardiosuppression in conjunction with a blunting of IL-1beta stimulated ceramide accumulation. These data suggest that leptin may modulate IL-1beta signaling through the sphingolipid signaling pathway in cardiomyocytes.
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Affiliation(s)
- M Judith Radin
- Department of Veterinary Biosciences, The Ohio State University, 1925 Coffey Road, Columbus, OH 43210, USA.
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22
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Wang G, Silva J, Dasgupta S, Bieberich E. Long-chain ceramide is elevated in presenilin 1 (PS1M146V) mouse brain and induces apoptosis in PS1 astrocytes. Glia 2008; 56:449-56. [PMID: 18205190 DOI: 10.1002/glia.20626] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The pro-apoptotic sphingolipid ceramide plays an emergent role in the etiology of Alzheimer's disease (AD), although its function for neurodegeneration is not known. We determined the concentration and composition of ceramide in hippocampal tissue from newborn presenilin 1 (PS1) knock-in (PS1M146V) mice, a mouse model for early-onset familial AD. We found that PS1 tissue contains 3.1 (+/-0.5)-fold more total ceramide than wild-type tissue. In particular, the proportion of C20 and C24 ceramide is increased by 4.0- or 8.5-fold, respectively. The ceramide elevation in PS1 brain is consistent with a 3.7 (+/-0.5)-fold increase of the protein level of the neurotrophin receptor p75NTR, which has been suggested to stimulate the hydrolysis of sphingomyelin to generate ceramide. The predominance of C20 and C24 ceramide is concurrent with the elevated gene expression of lass 2 and lass 4, two isoforms of ceramide synthase that generate dihydroceramide with long-chain fatty acid. Our study indicates that primary cultured astrocytes but not neurons from PS1 mice undergo apoptosis when incubated with C20 ceramide. In contrast, wild-type astrocytes remain unaffected. The sensitivity of PS1 astrocytes is most likely due to the 9.5 (+/-0.4)-fold elevated expression of PAR-4 (prostate apoptosis response-4), a protein that inhibits atypical PKC zeta/lambda in the presence of ceramide. Our results suggest that astroglial death due to ceramide/PAR-4-induced apoptosis may critically contribute to the etiology of AD.
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Affiliation(s)
- Guanghu Wang
- Program in Developmental Neurobiology, Institute of Molecular Medicine and Genetics, School of Medicine, Medical College of Georgia, Augusta, GA 30912, USA
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23
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Wang G, Krishnamurthy K, Chiang YW, Dasgupta S, Bieberich E. Regulation of neural progenitor cell motility by ceramide and potential implications for mouse brain development. J Neurochem 2008; 106:718-33. [PMID: 18466329 DOI: 10.1111/j.1471-4159.2008.05451.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We provide evidence that the sphingolipid ceramide, in addition to its pro-apoptotic function, regulates neural progenitor (NP) motility in vitro and brain development in vivo. Ceramide (N-palmitoyl d-erythro sphingosine and N-oleoyl d-erythro sphingosine) and the ceramide analog N-oleoyl serinol (S18) stimulate migration of NPs in scratch (wounding) migration assays. Sphingolipid depletion by inhibition of de novo ceramide biosynthesis, or ceramide inactivation using an anti-ceramide antibody, obliterates NP motility, which is restored by ceramide or S18. These results suggest that ceramide is crucial for NP motility. Wounding of the NP monolayer activates neutral sphingomyelinase indicating that ceramide is generated from sphingomyelin. In membrane processes, ceramide is co-distributed with its binding partner atypical protein kinase C zeta/lambda (aPKC), and Cdc42, alpha/beta-tubulin, and beta-catenin, three proteins involved in aPKC-dependent regulation of cell polarity and motility. Sphingolipid depletion by myriocin prevents membrane translocation of aPKC and Cdc42, which is restored by ceramide or S18. These results suggest that ceramide-mediated membrane association of aPKC/Cdc42 is important for NP motility. In vivo, sphingolipid depletion leads to ectopic localization of mitotic or post-mitotic neural cells in the embryonic brain, while S18 restores the normal brain organization. In summary, our study provides novel evidence that ceramide is critical for NP motility and polarity in vitro and in vivo.
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Affiliation(s)
- Guanghu Wang
- Program in Developmental Neurobiology, Institute of Molecular Medicine and Genetics, School of Medicine, Medical College of Georgia, Augusta, Georgia, USA
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24
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He H, Conrad CA, Nilsson CL, Ji Y, Schaub TM, Marshall AG, Emmett MR. Method for lipidomic analysis: p53 expression modulation of sulfatide, ganglioside, and phospholipid composition of U87 MG glioblastoma cells. Anal Chem 2007; 79:8423-30. [PMID: 17929901 DOI: 10.1021/ac071413m] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Lipidomics can complement genomics and proteomics by providing new insight into dynamic changes in biomembranes; however, few reports in the literature have explored, on an organism-wide scale, the functional link between nonenzymatic proteins and cellular lipids. Here, we report changes induced by adenovirus-delivered wild-type p53 gene and chemotherapy of U87 MG glioblastoma cells, a treatment known to trigger apoptosis and cell cycle arrest. We compare polar lipid changes in treated cells and control cells by use of a novel, sensitive method that employs lipid extraction, one-step liquid chromatography separation, high-resolution mass analysis, and Kendrick mass defect analysis. Nano-LC FT-ICR MS and quadrupole linear ion trap MS/MS analysis of polar lipids yields hundreds of unique assignments of glyco- and phospholipids at sub-ppm mass accuracy and high resolving power (m/Deltam50% = 200 000 at m/z 400) at 1 s/scan. MS/MS data confirm molecular structures in many instances. Sulfatides are most highly modulated by wild-type p53 treatment. The treatment also leads to an increase in phospholipids such as phosphatidyl inositols, phosphatidyl serines, phosphatidyl glycerols, and phosphatidyl ethanolamines. An increase in hydroxylated phospholipids is especially noteworthy. Also, a decrease in the longer chain gangliosides, GD1 and GM1b, is observed in wild-type p53 (treated) cells.
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Affiliation(s)
- Huan He
- National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310-4005, USA
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25
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Miakotina OL, McCoy DM, Shi L, Look DC, Mallampalli RK. Human adenovirus modulates surfactant phospholipid trafficking. Traffic 2007; 8:1765-1777. [PMID: 17897321 DOI: 10.1111/j.1600-0854.2007.00641.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Surfactant, highly enriched with phosphatidylcholine (PC), is secreted into the airspace by a classic apical secretory route, thereby maintaining lung stability. Herein, we show that adenoviral infection decreases surfactant PC in lungs by inhibiting its apical secretion and redirecting its export in alveolar cells by a basolateral route. These effects were not observed with replication-deficient adenovirus (Ad), specifically lacking early region 1 (E1) gene products. Adenoviral stimulation of basolateral PC export from cells was not observed after pharmacologic inhibition of ATP-binding cassette proteins, after introduction of small interfering RNA to the lipid pump ATP-binding cassette transporter A1 (ABCA1) or in ABCA1-defective human Tangier disease fibroblasts. Adenovirus and its E1A gene product increased ABCA1 levels by transcriptionally activating the ABCA1 gene. Thus, Ad lowers surfactant, in part, by triggering ABCA1-directed basolateral PC export, thereby limiting the cellular pool of surfactant PC destined for apical secretion. The results support a novel pathway, whereby a viral pathogen disrupts surfactant trafficking.
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Affiliation(s)
- Olga L Miakotina
- Department of Internal Medicine, University of Iowa, Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA 52242, USA
| | - Diann M McCoy
- Department of Internal Medicine, University of Iowa, Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA 52242, USA
| | - Lei Shi
- Department of Internal Medicine, University of Iowa, Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA 52242, USA
| | - Dwight C Look
- Department of Internal Medicine, University of Iowa, Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA 52242, USA
| | - Rama K Mallampalli
- Department of Internal Medicine, University of Iowa, Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA 52242, USA
- Department of Biochemistry, University of Iowa, Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA 52242, USA
- Department of Veterans Affairs Medical Center, University of Iowa, Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA 52242, USA
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Dasgupta S, Adams JA, Hogan EL. Maternal alcohol consumption increases sphingosine levels in the brains of progeny mice. Neurochem Res 2007; 32:2217-24. [PMID: 17701351 DOI: 10.1007/s11064-007-9445-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2007] [Accepted: 07/13/2007] [Indexed: 10/23/2022]
Abstract
The effect of 'binge' alcohol upon sphingolipid metabolism in the fetal alcohol syndrome (FAS) was examined in pregnant mice (C57BL/6J) by administering a single dose of alcohol during the third trimester (gestational day 15-16). The control mice were administered a sucrose solution of equal caloric value. Brains from progeny at postnatal days 5, 15, 21 and 30 were dissected into three regions, and sphingolipid concentrations of the brain regions were determined including assay of monoglycosylceramide, ceramide, sphingosine and sphingomyelin. We found that a single dose of ethanol induces an elevation of sphingosine (2-3.5-fold) in the brain of progeny. The level of brain ceramide at a dose of 1.5 g/kg was significantly higher than control. Alcohol consumption during pregnancy induces neuronal loss in progeny brains. Our result suggests that the elevation of sphingosine in progeny brain induced by maternal alcohol consumption may be responsible for observed neuronal loss in FAS.
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Affiliation(s)
- S Dasgupta
- Department of Neurology, Medical University of South Carolina, Charleston, SC 29425, USA.
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Dasgupta S, Yanagisawa M, Krishnamurthy K, Liour SS, Yu RK. Tumor necrosis factor-alpha up-regulates glucuronosyltransferase gene expression in human brain endothelial cells and promotes T-cell adhesion. J Neurosci Res 2007; 85:1086-94. [PMID: 17335072 DOI: 10.1002/jnr.21214] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Stimulation of human brain microvascular endothelial cells (SV-HCECs) with tumor necrosis factor-alpha (TNF-alpha) up-regulates sulfoglucuronosyl paragloboside (SGPG) synthesis in a dose- and time-dependent manner. After TNF-alpha exposure at a concentration of 50 ng/ml for 24 hr, we observed a seven- to tenfold elevation of SGPG concentration. Interleukin-1beta (IL-1beta) at a concentration of 10 ng/ml and the combined doses of TNF-alpha and IL-1beta were less effective than TNF-alpha alone. TNF-alpha also stimulated T-cell (Jurkat) adhesion with SV-HCECs via SGPG-L-selectin recognition: this was determined by double-label immunofluorescent staining with SGPG and L-selectin antibodies. The number of T cells bound to SV-HCECs after different cytokine stimulations was proportional to the SGPG concentration, and the cell attachment was inhibited by anti-SGPG and anti-L-selectin antibodies, respectively. Our data unequivocally establish that inflammatory cytokines, particularly TNF-alpha, stimulate the glucuronosyltransferse, GlcAT-P, and GlcAT-S, gene expression in brain endothelial cells and promote T-cell adhesion via SGPG-L-selectin recognition, a preliminary step for onset of neuroinflammation.
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Affiliation(s)
- Somsankar Dasgupta
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Augusta, Georgia 30912, USA
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Yang CR, Liour SS, Dasgupta S, Yu RK. Inhibition of neuronal migration by JONES antibody is independent of 9-O-acetyl GD3 in GD3-synthase knockout mice. J Neurosci Res 2007; 85:1381-90. [PMID: 17385751 DOI: 10.1002/jnr.21264] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
It has been shown previously that the migration of granule neurons in neonatal cerebellum can be inhibited by a monoclonal antibody (Mab) JONES. Because the inhibition is presumed to be mediated through binding of the JONES antibody to 9-O-acetyl GD3, we used GD3-synthase knockout (GD3S-/-) mice that do not express 9-O-acetyl GD3 and also have no detectable defect in brain development, to examine the mechanism of the inhibitory effect. We found no difference between the migration of granule neurons in the neonatal cerebellar explant culture in GD3S-/- mice and in wild-type mice. Addition of the Mab JONES, but not Mab R24 or A2B5, in the culture medium blocked the neuronal migration in the explant culture of the wild-type mice. The inhibitory effect of Mab JONES was also observed, however, in the explant culture of GD3S-/- mice. Immuno-HPTLC analysis showed at least two JONES-positive glycolipids bands in the lipid extract of GD3S+/+ mice, and none was detected in that of GD3S-/- mice. Western blot analysis of the cerebellum homogenate of wild-type and GD3S-/- mice identified at least 3 JONES-positive protein bands, one of which is beta1-integrin. Because the JONES antibody also blocked neuronal migration in the cerebellar explant culture of GD3S-/- mice that do not express 9-O-acetyl-GD3, it suggested an alternative mechanism for the inhibitory effect of the antibody, at least in the GD3S knockout mice, and the inhibitory effect of the JONES antibody on neuronal migration could be mediated through its binding to beta1-integrin.
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Affiliation(s)
- Chia-Ron Yang
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Augusta, Georgia 30912, USA
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Krishnamurthy K, Wang G, Silva J, Condie BG, Bieberich E. Ceramide regulates atypical PKCzeta/lambda-mediated cell polarity in primitive ectoderm cells. A novel function of sphingolipids in morphogenesis. J Biol Chem 2006; 282:3379-90. [PMID: 17105725 DOI: 10.1074/jbc.m607779200] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
In mammals, the primitive ectoderm is an epithelium of polarized cells that differentiates into all embryonic tissues. Our study shows that in primitive ectoderm cells, the sphingolipid ceramide was elevated and co-distributed with the small GTPase Cdc42 and cortical F-actin at the apicolateral cell membrane. Pharmacological or RNA interference-mediated inhibition of ceramide biosynthesis enhanced apoptosis and impaired primitive ectoderm formation in embryoid bodies differentiated from mouse embryonic stem cells. Primitive ectoderm formation was restored by incubation with ceramide or a ceramide analog. Ceramide depletion prevented plasma membrane translocation of PKCzeta/lambda, its interaction with Cdc42, and phosphorylation of GSK-3beta, a substrate of PKCzeta/lambda. Recombinant PKCzeta formed a complex with the polarity protein Par6 and Cdc42 when bound to ceramide containing lipid vesicles. Our data suggest a novel mechanism by which a ceramide-induced, apicolateral polarity complex with PKCzeta/lambda regulates primitive ectoderm cell polarity and morphogenesis.
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Affiliation(s)
- Kannan Krishnamurthy
- Institute of Molecular Medicine and Genetics, School of Medicine, Medical College of Georgia, Augusta, Georgia 30912, USA
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Ratha J, Majumdar KN, Mandal SK, Bera R, Sarkar C, Saha B, Mandal C, Saha KD, Bhadra R. A sphingolipid rich lipid fraction isolated from attenuated Leishmania donovani promastigote induces apoptosis in mouse and human melanoma cells in vitro. Mol Cell Biochem 2006; 290:113-23. [PMID: 16718368 DOI: 10.1007/s11010-006-9174-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2005] [Accepted: 03/01/2006] [Indexed: 11/28/2022]
Abstract
Lipids, especially sphingolipids, are emerging as inducer of apoptosis in a wide range of immortal cells, potentiating their therapeutic application in cancer. In the present study, a sphingolipid rich lipid fraction (denoted here as ALL), isolated from an attenuated strain of Leishmania donovani promastigote, was tested for its tumoricidal activity taking melanoma, the dreaded form of skin cancer cells, as model. ALL was found to induce chromatin condensation, internucleosomal DNA fragmentation and phosphatidylserine externalization with enhanced cell population in sub-G1 region in both mouse and human melanoma systems, namely B16F10 and A375 respectively. These are the hallmarks of cells undergoing apoptosis. Further analysis demonstrated that ALL treated melanoma cells showed significant increase in ROS generation, mitochondrial membrane potential depolarization, release of cytochrome c, and caspase-3 activation, which are the events closely involved in apoptosis. These findings indicate that one or more bioactive sphingolipid(s)/ceramide(s) present in ALL could be the causative agent(s) for the induction of apoptosis in melanoma cells. Further studies are thus necessary to identify these specific bioactive sphingolipid(s)/ceramide(s) and to establish their mechanism of action, in order to explore their use as anticancer agents.
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Affiliation(s)
- Jagnyeswar Ratha
- Cellular Biochemistry Division, Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
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Poerschmann J, Trommler U, Biedermann W, Truyen U, Lücker E. Sequential pressurized liquid extraction to determine brain-originating fatty acids in meat products as markers in bovine spongiform encephalopathy risk assessment studies. J Chromatogr A 2006; 1127:26-33. [PMID: 16782118 DOI: 10.1016/j.chroma.2006.05.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2006] [Revised: 05/08/2006] [Accepted: 05/11/2006] [Indexed: 11/26/2022]
Abstract
A new approach using sequential pressurized liquid extraction described recently [J. Poerschmann, R. Carlson, J. Chromatogr. A, 1127 (2006) 18-25] was applied to determine lipid markers originating from central nervous system (CNS) tissue of cows in heat-processed sausages. These studies are very important in quality control as well as risk assessment studies in the face of the bovine spongiform encephalopathy (BSE) crisis. Diagnostic CNS lipid markers, which should not be present in meat products without CNS addition, were recognized on complete transesterification as polar 2-hydroxy-fatty acids (2OH-24:0, 2OH-24:1, 2OH-22:0, 2OH-18:0, shorthand designation) as well as odd-numbered non-branched fatty acids beyond C(22). An array of other fatty acids including lignoceric acid (24:0), nervonic acid (24:1), arachidonic acid (20:4), and polyunsaturated nC(22)-surrogates are strongly related to CNS lipids, but occur as traces in meat products without CNS addition as well, thus reducing their value as diagnostic markers. Samples including meat products without CNS addition, meat with 3% CNS addition, as well as pure CNS homogenates, were subjected to sequential PLE (pressurized liquid extraction) consisting of two steps: n-hexane/acetone 9:1 (v/v) extraction at 50 degrees C to remove neutral lipids, followed by chloroform/methanol 1:4 (v/v) extraction at 110 degrees C to isolate polar CNS lipids (two 10 min PLE cycles each). To enhance the fractionation efficiency, cyanopropyl modified silica as well as chemically not modified silica sorbent was used at the outlet of the PLE cartridge to retard polar lipids in the first extraction step. This method proved superior to widely distributed exhaustive lipid extraction followed by solid-phase extraction (SPE) using silica regarding lipid recoveries and clear-cut boundaries between lipid classes. Methodological studies showed that the alcoholysis using trimethylchlorosilane/methanol (1:9, v/v) is an excellent method for the complete transesterification of lipids and quantitative formation of methyl esters.
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Affiliation(s)
- J Poerschmann
- UFZ-Center for Environmental Research, Leipzig-Halle, Permoserstrasse 15, 04318 Leipzig, Germany.
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Poerschmann J, Carlson R. New fractionation scheme for lipid classes based on “in-cell fractionation” using sequential pressurized liquid extraction. J Chromatogr A 2006; 1127:18-25. [PMID: 16904118 DOI: 10.1016/j.chroma.2006.07.063] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2006] [Revised: 07/20/2006] [Accepted: 07/25/2006] [Indexed: 10/24/2022]
Abstract
A new preparation scheme is proposed to fractionate neutral lipids (acylglycerines, sterol esters, long-chain free fatty acids) from polar phospholipids in biological matrices. This fractionation is mandatory in the microbial community, for the control of bioremediation processes, in the study of phytoplankton growth in lakes and rivers, and in the quality control of processed food. Basically, a two-step pressurized liquid extraction (PLE) scheme is combined with an "in-cell-fractionation" using silica-based sorbents placed at the outlet of the PLE cartridge. The optimized extraction scheme consists of n-hexane/acetone (9:1, v/v) extraction at 50 degrees C (2 cycles, 10 min each) to obtain neutral lipids followed by chloroform/methanol (1:4, v/v) extraction at 110 degrees C (2 cycles, 10 min each). Thermally pre-treated silicic acid and cyanoproyl-modified silica turned out to be appropriate sorbents to ensure clear-cut boundaries between neutral lipids and phospholipids. The proposed protocol is superior to commonly used approaches consisting of an exhaustive lipid extraction followed by off-line lipid fractionation using solid-phase extraction (SPE) regarding fractionation efficiency, time and solvent consumption. In this paper, it is also shown that the transmethylation using trimethylchlorosilane/methanol (1:9, v/v) provides a complete reaction to give methyl esters without artefact formation across the array of different lipid classes even with polyunsaturated fatty acid moieties.
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Affiliation(s)
- J Poerschmann
- UFZ-Centre for Environmental Research Leipzig-Halle Ltd., Department of Environmental Technology, Permoserstrasse 15, 04318 Leipzig, Germany.
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Saqr HE, Omran O, Dasgupta S, Yu RK, Oblinger JL, Yates AJ. Endogenous GD3 ganglioside induces apoptosis in U-1242 MG glioma cells. J Neurochem 2006; 96:1301-14. [PMID: 16441517 DOI: 10.1111/j.1471-4159.2005.03640.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
GD3 ganglioside induces apoptosis in several cell types, but the molecular events through which this occurs are largely unknown. We investigated the apoptotic effects of GD3 expression using U-1242 MG glioblastoma cells, as these cells synthesize almost exclusively GM3 and GM2 but not GD3. To express GD3 under the control of the TetOn system with minimum leakage, we modified the system by constructing a single tri-cistronic retrovirus vector containing three genes separated by two internal ribosome entry sites: (a) transcriptional silencer, tTS; (b) mutant of reverse transcriptional activator, rtTA2(S)-M2 (provided by H. Bujard, Heidelberg, Germany); and (c) enhanced green fluorescent protein (EGFP), as an indicator of the tri-cistronic gene expression. Using flow cytometry, we selected glioma cells (U1242MG-GD3 clone) that express high levels of GD3 in response to doxycycline. Expression of GD3 was associated with apoptosis as verified by annexin-V binding, TdT-mediated dUTPnick end-labelling assay (TUNEL), and EGFP degradation. GD3-induced apoptosis occurred via caspase-8 activation, as GD3 caused cleavage of caspase-8 and inhibition of caspase-8 activation by zlETD-fmk minimized GD3-induced apoptosis.
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Affiliation(s)
- H E Saqr
- Department of Pathology, The Ohio State University, Columbus, Ohio 43210, USA
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Nowak B, Mueffling TV, Kuefen A, Ganseforth K, Seyboldt C. Detection of bovine central nervous system tissue in liver sausages using a reverse transcriptase PCR technique and a commercial enzyme-linked immunosorbent assay. J Food Prot 2005; 68:2178-83. [PMID: 16245726 DOI: 10.4315/0362-028x-68.10.2178] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The suitability of a reverse transcriptase (RT) PCR assay was evaluated for the detection of bovine central nervous system (CNS) tissue specifically in liver sausages. Because of its emulsifying effect, CNS tissue was frequently added to this kind of meat product in the past. On standard samples, the RT-PCR technique reliably detected a concentration of 0.25% bovine CNS tissue in liver sausages stored for up to 28 days. Following the successful application of RT-PCR for the detection of bovine CNS tissue in these specially prepared samples, a field study was performed with a total of 258 liver sausages purchased in retail markets. All sausages were tested with both an RT-PCR assay and a commercial enzyme-linked immunosorbent assay (ELISA) kit. Nine (3.5%) of the retail liver sausage samples were positive for CNS tissue in the ELISA, but none were positive for this tissue in the RT-PCR assay. All positive ELISA results indicated the presence of 0.23 to 0.30% CNS tissue. Recent studies have indicated that the RT-PCR assay is not as sensitive for porcine CNS tissue as for bovine CNS tissue, which this assay can detect at 0.25%. Although the ELISA is not species specific, the CNS tissue detected by the ELISA is assumed to stem from a nonbovine species. The RT-PCR technique is a sensitive tool for the detection of bovine CNS tissues in a problematic matrix such as liver sausage. ELISA screening followed by a species-specific RT-PCR assay for bovine CNS tissue is a practical approach for monitoring meat products for compliance with European food regulations.
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Affiliation(s)
- B Nowak
- Institute for Food Quality and Food Safety, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, Hannover D-30173, Germany.
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Kuerschner L, Ejsing CS, Ekroos K, Shevchenko A, Anderson KI, Thiele C. Polyene-lipids: A new tool to image lipids. Nat Methods 2004; 2:39-45. [PMID: 15782159 DOI: 10.1038/nmeth728] [Citation(s) in RCA: 157] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2004] [Accepted: 11/12/2004] [Indexed: 11/08/2022]
Abstract
Microscopy of lipids in living cells is currently hampered by a lack of adequate fluorescent tags. The most frequently used tags, NBD and BODIPY, strongly influence the properties of lipids, yielding analogs with quite different characteristics. Here, we introduce polyene-lipids containing five conjugated double bonds as a new type of lipid tag. Polyene-lipids exhibit a unique structural similarity to natural lipids, which results in minimal effects on the lipid properties. Analyzing membrane phase partitioning, an important biophysical and biological property of lipids, we demonstrated the superiority of polyene-lipids to both NBD- and BODIPY-tagged lipids. Cells readily take up various polyene-lipid precursors and generate the expected end products with no apparent disturbance by the tag. Applying two-photon excitation microscopy, we imaged the distribution of polyene-lipids in living mammalian cells. For the first time, ether lipids, important for the function of the brain, were successfully visualized.
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Affiliation(s)
- Lars Kuerschner
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Pfotenhauerstr. 108, 01307 Dresden, Germany
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Hayashi T, Su TP. Sigma-1 receptors at galactosylceramide-enriched lipid microdomains regulate oligodendrocyte differentiation. Proc Natl Acad Sci U S A 2004; 101:14949-54. [PMID: 15466698 PMCID: PMC522002 DOI: 10.1073/pnas.0402890101] [Citation(s) in RCA: 129] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2004] [Indexed: 11/18/2022] Open
Abstract
In the brain, myelin is important in regulating nerve conduction and neurotransmitter release by providing insulation at axons. Myelin is a specialized yet continuous sheet structure of differentiated oligodendrocytes (OLs) that is enriched in lipids, specifically galactosylceramides (GalCer) originated at the endoplasmic reticulum (ER). GalCer are known to affect OL differentiation. However, the mechanism whereby GalCer affect OL differentiation is not well understood. Sigma-1 receptors (Sig-1Rs), shown by us to exist in detergent-insoluble lipid microdomains at lipid-enriched loci of ER in NG108 cells, are important in the compartmentalization/transport of ER-synthesized lipids and in cellular differentiation. In this study, we used rat primary hippocampal cultures and found that Sig-1Rs form GalCer-enriched lipid rafts at ER lipid droplet-like structures in the entire myelin sheet of mature OLs. In rat OL progenitors (CG-4 cells), levels of lipid raft-residing Sig-1Rs and GalCer increase as cells differentiate. Sig-1Rs also increase in OLs and myelin of developing rat brains. Sig-1R, GalCer, and cholesterol are colocalized and are resistant to the Triton X-100 solubilization. Treating cells with a Sig-1R agonist or targeting Sig-1Rs at lipid rafts by overexpression of Sig-1Rs in CG-4 cells enhances differentiation, whereas reducing Sig-1Rs at lipid rafts by transfection of functionally dominant-negative Sig-1Rs attenuates differentiation. Furthermore, Sig-1R siRNA inhibits differentiation. Our findings indicate that, in the brain, Sig-1Rs targeting GalCer-containing lipid microdomains are important for OL differentiation and that Sig-1Rs may play an important role in the pathogenesis of certain demyelinating diseases.
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Affiliation(s)
- Teruo Hayashi
- Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, U.S. Department of Health and Human Services, 5500 Nathan Shock Drive, Baltimore, MD 21224, USA
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Carrié I, Portoukalian J, Vicaretti R, Rochford J, Potvin S, Ferland G. Menaquinone-4 concentration is correlated with sphingolipid concentrations in rat brain. J Nutr 2004; 134:167-72. [PMID: 14704312 DOI: 10.1093/jn/134.1.167] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Studies with animals support a role for vitamin K (VK) in the biosynthesis of sphingolipids, a class of complex lipids present in high concentrations in the brain. In mice and rats, VK deficiency decreases levels of brain sulfatides and causes behavioral alterations. In light of its heterogeneity and to better understand the role of VK in the brain, we characterized the distribution of the two main VK vitamers, phylloquinone (K1) and menaquinone-4 (MK-4), in nine distinct brain regions. Weaning female Sprague-Dawley rats (n=5/dietary group) were fed diets containing either low (L, 80 microg/kg diet), adequate (A, 500 microg/kg diet) or high (H, 2000 microg/kg diet) levels of K1 for 6 mo. The main form of VK in the brain was MK-4, and it was present in significantly higher concentrations in myelinated regions (the pons medulla and midbrain) than in nonmyelinated regions. Both regional K1 and MK-4 increased with K1 intake (P<0.05). Sphingolipid distribution varied across brain regions (P<0.001) but was not affected by K1 intake. In the L and A groups but not the H group, brain MK-4 concentration was positively correlated with the concentrations of sulfatides (L, r=0.518; A, r=0.479) and sphingomyelin (L, r=0.515; A, r=0.426), and negatively correlated with ganglioside concentration (L, r=-0.398); A, r=-0.353). Sphingolipids are involved in major cellular events such as cell proliferation, differentiation and survival. The strong associations reported here between brain MK-4 and sphingomyelin, sulfatides and gangliosides suggest that this vitamer may play an important role in the brain.
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Affiliation(s)
- Isabelle Carrié
- Département de Nutrition, Université de Montréal, H3C 3J7 Montréal, Canada
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Bieberich E, MacKinnon S, Silva J, Noggle S, Condie BG. Regulation of cell death in mitotic neural progenitor cells by asymmetric distribution of prostate apoptosis response 4 (PAR-4) and simultaneous elevation of endogenous ceramide. J Cell Biol 2003; 162:469-79. [PMID: 12885759 PMCID: PMC2172704 DOI: 10.1083/jcb.200212067] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Cell death and survival of neural progenitor (NP) cells are determined by signals that are largely unknown. We have analyzed pro-apoptotic signaling in individual NP cells that have been derived from mouse embryonic stem cells. NP formation was concomitant with elevated apoptosis and increased expression of ceramide and prostate apoptosis response 4 (PAR-4). Morpholino oligonucleotide-mediated antisense knockdown of PAR-4 or inhibition of ceramide biosynthesis reduced stem cell apoptosis, whereas PAR-4 overexpression and treatment with ceramide analogs elevated apoptosis. Apoptotic cells also stained for proliferating cell nuclear antigen (a nuclear mitosis marker protein), but not for nestin (a marker for NP cells). In mitotic cells, asymmetric distribution of PAR-4 and nestin resulted in one nestin(-)/PAR-4(+) daughter cell, in which ceramide elevation induced apoptosis. The other cell was nestin(+), but PAR-4(-), and was not apoptotic. Asymmetric distribution of PAR-4 and simultaneous elevation of endogenous ceramide provides a possible mechanism underlying asymmetric differentiation and apoptosis of neuronal stem cells in the developing brain.
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Affiliation(s)
- Erhard Bieberich
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, 1120 15th Street, Room CB-2803, Augusta, GA 30912, USA.
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Silva J, Beckedorf A, Bieberich E. Osteoblast-derived oxysterol is a migration-inducing factor for human breast cancer cells. J Biol Chem 2003; 278:25376-85. [PMID: 12734199 DOI: 10.1074/jbc.m301233200] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Bone metastasis is the major reason for death caused by breast cancer. We used human breast cancer (MCF-7) cells that are poorly metastatic but show highly inducible migration to determine bone-derived factors that induce migration of initially non-disseminating breast cancer cells. We have found that a lipid fraction from human osteoblast-like MG63 cell-conditioned medium (MG63CM) contains a migration-inducing factor for MCF-7 cells. In this fraction, we have identified oxysterol (OS) as a lipid mediator for tumor cell migration. In MCF-7 cells, insulin-like growth factor 1 elevates the expression of OS-binding protein-related protein 7. Binding of OS to OS-binding protein or OS-binding protein-related protein is known to trigger elevation of sphingomyelin, a sphingolipid that organizes lipid microdomains in the cell membrane. In MCF-7 cells, OS increases the intracellular concentration of sphingomyelin and other phospholipids and induces the translocation of the small GTPase p21Ras to GM1- and cholesterol-rich membrane areas. The induction of migration by MG63CM is prevented by incubation of MG63 cells with mevinolin, a statin-type cholesterol biosynthesis inhibitor that depletes the conditioned medium of OS. Osteoblast-derived OS may, thus, be a yet unrecognized lipid mediator for bone metastasis of breast cancer and a new target for anti-metastasis chemotherapy with statins.
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Affiliation(s)
- Jeane Silva
- Institute of Molecular Medicine and Genetics, Department of Medicine, Medical College of Georgia, Augusta, Georgia 30909, USA
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Bodennec J, Pelled D, Futerman AH. Aminopropyl solid phase extraction and 2 D TLC of neutral glycosphingolipids and neutral lysoglycosphingolipids. J Lipid Res 2003; 44:218-26. [PMID: 12518041 DOI: 10.1194/jlr.d200026-jlr200] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Methods for isolation of neutral lysoglycosphingolipids (n-lyso-GSLs) such as glucosylsphingosine and galactosylsphingosine normally involve mild alkaline or acid hydrolysis followed by multiple chromatography steps, yielding relatively low recoveries of n-lyso-GSLs and neutral glycosphingolipids (n-GSLs). We now describe a new technique for isolating these compounds using one chromatography step, resulting in quantitative recovery of n-GSLs and n-lyso-GSLs. Lipids are extracted using a modified Folch procedure in which recovery is optimized by reextracting the Folch upper phase with water-saturated butanol. The extract is applied to an aminopropyl solid phase column from which both n-GSLs and n-lyso-GSLs elute in the same fraction. Separation is achieved using a new two-dimensional thin-layer chromatography procedure. The usefulness of this technique for biological samples was tested by examining Glc[4,5-(3)H]ceramide and Glc[4,5-(3)H]sphingosine accumulation in metabolically-labeled neurons treated with an inhibitor of lysosomal glucocerebrosidase. Accurate quantification of both lipids was obtained with Glc[4,5-(3)H]ceramide and Glc[4,5-(3)H]sphingosine accumulating at levels of 20 nmol/mg DNA and 40 pmol/mg DNA, respectively. This simple and rapid technique can therefore be used for the analysis of lyso-GSLs and GSLs in the same tissue, which may permit the determination of their metabolic pathways in normal and in pathological tissues, such as those taken from Gaucher and Krabbe's disease patients.
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Affiliation(s)
- Jacques Bodennec
- Department of Biological Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel
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