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Allwright M, Guennewig B, Hoffmann AE, Rohleder C, Jieu B, Chung LH, Jiang YC, Lemos Wimmer BF, Qi Y, Don AS, Leweke FM, Couttas TA. ReTimeML: a retention time predictor that supports the LC-MS/MS analysis of sphingolipids. Sci Rep 2024; 14:4375. [PMID: 38388524 PMCID: PMC10883992 DOI: 10.1038/s41598-024-53860-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 02/06/2024] [Indexed: 02/24/2024] Open
Abstract
The analysis of ceramide (Cer) and sphingomyelin (SM) lipid species using liquid chromatography-tandem mass spectrometry (LC-MS/MS) continues to present challenges as their precursor mass and fragmentation can correspond to multiple molecular arrangements. To address this constraint, we developed ReTimeML, a freeware that automates the expected retention times (RTs) for Cer and SM lipid profiles from complex chromatograms. ReTimeML works on the principle that LC-MS/MS experiments have pre-determined RTs from internal standards, calibrators or quality controls used throughout the analysis. Employed as reference RTs, ReTimeML subsequently extrapolates the RTs of unknowns using its machine-learned regression library of mass-to-charge (m/z) versus RT profiles, which does not require model retraining for adaptability on different LC-MS/MS pipelines. We validated ReTimeML RT estimations for various Cer and SM structures across different biologicals, tissues and LC-MS/MS setups, exhibiting a mean variance between 0.23 and 2.43% compared to user annotations. ReTimeML also aided the disambiguation of SM identities from isobar distributions in paired serum-cerebrospinal fluid from healthy volunteers, allowing us to identify a series of non-canonical SMs associated between the two biofluids comprised of a polyunsaturated structure that confers increased stability against catabolic clearance.
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Affiliation(s)
- Michael Allwright
- ForeFront, Brain and Mind Centre, The University of Sydney, Sydney, Australia
| | - Boris Guennewig
- ForeFront, Brain and Mind Centre, The University of Sydney, Sydney, Australia
| | - Anna E Hoffmann
- Translational Research Collective, Brain and Mind Centre, The University of Sydney, Sydney, NSW, 2006, Australia
- Endosane Pharmaceuticals GmbH, Berlin, Germany
| | - Cathrin Rohleder
- Translational Research Collective, Brain and Mind Centre, The University of Sydney, Sydney, NSW, 2006, Australia
- Endosane Pharmaceuticals GmbH, Berlin, Germany
- Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Beverly Jieu
- Translational Research Collective, Brain and Mind Centre, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Long H Chung
- Centenary Institute, The University of Sydney, Sydney, Australia
| | - Yingxin C Jiang
- Centenary Institute, The University of Sydney, Sydney, Australia
| | - Bruno F Lemos Wimmer
- Translational Research Collective, Brain and Mind Centre, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Yanfei Qi
- Centenary Institute, The University of Sydney, Sydney, Australia
| | - Anthony S Don
- School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - F Markus Leweke
- Translational Research Collective, Brain and Mind Centre, The University of Sydney, Sydney, NSW, 2006, Australia
- Endosane Pharmaceuticals GmbH, Berlin, Germany
- Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Timothy A Couttas
- Translational Research Collective, Brain and Mind Centre, The University of Sydney, Sydney, NSW, 2006, Australia.
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2
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Obis E, Sol J, Andres-Benito P, Martín-Gari M, Mota-Martorell N, Galo-Licona JD, Piñol-Ripoll G, Portero-Otin M, Ferrer I, Jové M, Pamplona R. Lipidomic Alterations in the Cerebral Cortex and White Matter in Sporadic Alzheimer's Disease. Aging Dis 2023; 14:1887-1916. [PMID: 37196109 PMCID: PMC10529741 DOI: 10.14336/ad.2023.0217] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 02/17/2023] [Indexed: 05/19/2023] Open
Abstract
Non-targeted LC-MS/MS-based lipidomic analysis was conducted in post-mortem human grey matter frontal cortex area 8 (GM) and white matter of the frontal lobe centrum semi-ovale (WM) to identify lipidome fingerprints in middle-aged individuals with no neurofibrillary tangles and senile plaques, and cases at progressive stages of sporadic Alzheimer's disease (sAD). Complementary data were obtained using RT-qPCR and immunohistochemistry. The results showed that WM presents an adaptive lipid phenotype resistant to lipid peroxidation, characterized by a lower fatty acid unsaturation, peroxidizability index, and higher ether lipid content than the GM. Changes in the lipidomic profile are more marked in the WM than in GM in AD with disease progression. Four functional categories are associated with the different lipid classes affected in sAD: membrane structural composition, bioenergetics, antioxidant protection, and bioactive lipids, with deleterious consequences affecting both neurons and glial cells favoring disease progression.
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Affiliation(s)
- Elia Obis
- Department of Experimental Medicine, Lleida University (UdL), Lleida Biomedical Research Institute (IRBLleida), Lleida, Spain.
| | - Joaquim Sol
- Department of Experimental Medicine, Lleida University (UdL), Lleida Biomedical Research Institute (IRBLleida), Lleida, Spain.
- Catalan Institute of Health (ICS), Lleida, Spain, Research Support Unit (USR), Fundació Institut Universitari per a la Recerca en Atenció Primària de Salut Jordi Gol i Gurina (IDIAP JGol), Lleida, Spain.
| | - Pol Andres-Benito
- CIBERNED (Network Centre of Biomedical Research of Neurodegenerative Diseases), Institute of Health Carlos III, Ministry of Economy and Competitiveness, Madrid, Spain.
- Bellvitge University Hospital-Bellvitge Biomedical Research Institute (IDIBELL), E-08907 Hospitalet de Llobregat, Barcelona, Spain.
| | - Meritxell Martín-Gari
- Department of Experimental Medicine, Lleida University (UdL), Lleida Biomedical Research Institute (IRBLleida), Lleida, Spain.
| | - Natàlia Mota-Martorell
- Department of Experimental Medicine, Lleida University (UdL), Lleida Biomedical Research Institute (IRBLleida), Lleida, Spain.
| | - José Daniel Galo-Licona
- Department of Experimental Medicine, Lleida University (UdL), Lleida Biomedical Research Institute (IRBLleida), Lleida, Spain.
| | - Gerard Piñol-Ripoll
- Unitat Trastorns Cognitius, Clinical Neuroscience Research, Santa Maria University Hospital, IRBLleida, Lleida, Spain.
| | - Manuel Portero-Otin
- Department of Experimental Medicine, Lleida University (UdL), Lleida Biomedical Research Institute (IRBLleida), Lleida, Spain.
| | - Isidro Ferrer
- CIBERNED (Network Centre of Biomedical Research of Neurodegenerative Diseases), Institute of Health Carlos III, Ministry of Economy and Competitiveness, Madrid, Spain.
- Bellvitge University Hospital-Bellvitge Biomedical Research Institute (IDIBELL), E-08907 Hospitalet de Llobregat, Barcelona, Spain.
- Department of Pathology and Experimental Therapeutics, University of Barcelona, L’Hospitalet de Llobregat, Barcelona, Spain.
| | - Mariona Jové
- Department of Experimental Medicine, Lleida University (UdL), Lleida Biomedical Research Institute (IRBLleida), Lleida, Spain.
| | - Reinald Pamplona
- Department of Experimental Medicine, Lleida University (UdL), Lleida Biomedical Research Institute (IRBLleida), Lleida, Spain.
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3
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Chua XY, Huang R, Herr D, Lai MKP, Wenk MR, Torta F. Mass Spectrometry Analysis of the Human Brain Sphingolipidome. Methods Mol Biol 2023; 2561:233-243. [PMID: 36399273 DOI: 10.1007/978-1-0716-2655-9_12] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
In recent decades, mass spectrometry-based lipidomics has provided a fertile environment for scientific investigations of biochemical and mechanistic processes in biological systems. Notably, this approach has been used to characterize physiological and pathological processes relevant to the central nervous system by identifying changes in the sphingolipid content in the brain, cerebral spinal fluid, and blood plasma. However, despite a preponderance of studies identifying correlations between specific lipids and disease progression, this powerful resource has not yet substantively translated into clinically useful diagnostic assays. Part of this gap may be explained by insufficient depth of the lipidomic profiles in many studies, by lab-to-lab inconsistencies in methodology, and a lack of absolute quantification. These issues limit the identification of specific molecular species and the harmonization of results across independent studies. In this chapter, we contextualize these issues with recent reports identifying correlations between brain lipids and neurological diseases, and we describe the workflow our group has optimized for analysis of the blood plasma sphingolipidome, adapted to the characterization of the human brain tissue.
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Affiliation(s)
- Xin Ying Chua
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Memory Aging and Cognition Centre, Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Ryan Huang
- Canyon Crest Academy, San Diego, CA, USA
| | - Deron Herr
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Department of Biology, San Diego State University, San Diego, CA, USA
| | - Mitchell K P Lai
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Memory Aging and Cognition Centre, Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Markus R Wenk
- Precision Medicine Translational Research Programme and Department of Biochemistry, Yong Loo Lin School of Medicine, NUS, Singapore, Singapore
- Singapore Lipidomics Incubator, Life Sciences Institute, NUS, Singapore, Singapore
| | - Federico Torta
- Precision Medicine Translational Research Programme and Department of Biochemistry, Yong Loo Lin School of Medicine, NUS, Singapore, Singapore.
- Singapore Lipidomics Incubator, Life Sciences Institute, NUS, Singapore, Singapore.
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4
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Zivko C, Sagar R, Xydia A, Mahairaki V. Lipid Profiling in Alzheimer's Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1423:281-287. [PMID: 37525056 DOI: 10.1007/978-3-031-31978-5_29] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
The human brain is the organ with the most lipids after adipose tissues. The rich heterogeneity of the neural lipidome is being actively investigated with the aim of shedding new light into the physiological and pathological roles these compounds play in the brain. This is particularly important for the study of increasingly common neurodegenerative pathologies, such as Alzheimer's disease (AD), whose underlying mechanisms are still insufficiently understood and for which there is no cure. The present text dives into the current knowledge of the lipid composition of the brain, with a particular focus on the application of lipid profiling to AD research.
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Affiliation(s)
- Cristina Zivko
- Department of Genetic Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
- The Richman Family Precision Medicine Center of Excellence in Alzheimer's Disease, Johns Hopkins Medicine, Baltimore, MD, USA
| | - Ram Sagar
- Department of Genetic Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
- The Richman Family Precision Medicine Center of Excellence in Alzheimer's Disease, Johns Hopkins Medicine, Baltimore, MD, USA
| | - Ariadni Xydia
- Department of Genetic Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
- The Richman Family Precision Medicine Center of Excellence in Alzheimer's Disease, Johns Hopkins Medicine, Baltimore, MD, USA
| | - Vasiliki Mahairaki
- Department of Genetic Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA.
- The Richman Family Precision Medicine Center of Excellence in Alzheimer's Disease, Johns Hopkins Medicine, Baltimore, MD, USA.
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5
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Plasma lipidome is dysregulated in Alzheimer's disease and is associated with disease risk genes. Transl Psychiatry 2021; 11:344. [PMID: 34092785 PMCID: PMC8180517 DOI: 10.1038/s41398-021-01362-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 03/10/2021] [Accepted: 04/06/2021] [Indexed: 01/11/2023] Open
Abstract
Lipidomics research could provide insights of pathobiological mechanisms in Alzheimer's disease. This study explores a battery of plasma lipids that can differentiate Alzheimer's disease (AD) patients from healthy controls and determines whether lipid profiles correlate with genetic risk for AD. AD plasma samples were collected from the Sydney Memory and Ageing Study (MAS) Sydney, Australia (aged range 75-97 years; 51.2% male). Untargeted lipidomics analysis was performed by liquid chromatography coupled-mass spectrometry (LC-MS/MS). We found that several lipid species from nine lipid classes, particularly sphingomyelins (SMs), cholesterol esters (ChEs), phosphatidylcholines (PCs), phosphatidylethanolamines (PIs), phosphatidylinositols (PIs), and triglycerides (TGs) are dysregulated in AD patients and may help discriminate them from healthy controls. However, when the lipid species were grouped together into lipid subgroups, only the DG group was significantly higher in AD. ChEs, SMs, and TGs resulted in good classification accuracy using the Glmnet algorithm (elastic net penalization for the generalized linear model [glm]) with more than 80% AUC. In general, group lipids and the lipid subclasses LPC and PE had less classification accuracy compared to the other subclasses. We also found significant increases in SMs, PIs, and the LPE/PE ratio in human U251 astroglioma cell lines exposed to pathophysiological concentrations of oligomeric Aβ42. This suggests that oligomeric Aβ42 plays a contributory, if not causal role, in mediating changes in lipid profiles in AD that can be detected in the periphery. In addition, we evaluated the association of plasma lipid profiles with AD-related single nucleotide polymorphisms (SNPs) and polygenic risk scores (PRS) of AD. We found that FERMT2 and MS4A6A showed a significantly differential association with lipids in all lipid classes across disease and control groups. ABCA7 had a differential association with more than half of the DG lipids (52.63%) and PI lipids (57.14%), respectively. Additionally, 43.4% of lipids in the SM class were differentially associated with CLU. More than 30% of lipids in ChE, PE, and TG classes had differential associations with separate genes (ChE-PICALM, SLC24A4, and SORL1; PE-CLU and CR1; TG-BINI) between AD and control group. These data may provide renewed insights into the pathobiology of AD and the feasibility of identifying individuals with greater AD risk.
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6
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Human Brain Lipidomics: Utilities of Chloride Adducts in Flow Injection Analysis. Life (Basel) 2021; 11:life11050403. [PMID: 33924945 PMCID: PMC8145723 DOI: 10.3390/life11050403] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/25/2021] [Accepted: 04/26/2021] [Indexed: 11/16/2022] Open
Abstract
Ceramides have been implicated in a number of disease processes. However, current means of evaluation with flow infusion analysis (FIA) have been limited primarily due to poor sensitivity within our high-resolution mass spectrometry lipidomics analytical platform. To circumvent this deficiency, we investigated the potential of chloride adducts as an alternative method to improve sensitivity with electrospray ionization. Chloride adducts of ceramides and ceramide subfamilies provided 2- to 50-fold increases in sensitivity both with analytical standards and biological samples. Chloride adducts of a number of other lipids with reactive hydroxy groups were also enhanced. For example, monogalactosyl diacylglycerols (MGDGs), extracted from frontal lobe cortical gray and subcortical white matter of cognitively intact subjects, were not detected as ammonium adducts but were readily detected as chloride adducts. Hydroxy lipids demonstrate a high level of specificity in that phosphoglycerols and phosphoinositols do not form chloride adducts. In the case of choline glycerophospholipids, the fatty acid substituents of these lipids could be monitored by MS2 of the chloride adducts. Monitoring the chloride adducts of a number of key lipids offers enhanced sensitivity and specificity with FIA. In the case of glycerophosphocholines, the chloride adducts also allow determination of fatty acid substituents. The chloride adducts of lipids possessing electrophilic hydrogens of hydroxyl groups provide significant increases in sensitivity. In the case of glycerophosphocholines, chloride attachment to the quaternary ammonium group generates a dominant anion, which provides the identities of the fatty acid substituents under MS2 conditions.
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Couttas TA, Rustam YH, Song H, Qi Y, Teo JD, Chen J, Reid GE, Don AS. A Novel Function of Sphingosine Kinase 2 in the Metabolism of Sphinga-4,14-Diene Lipids. Metabolites 2020; 10:metabo10060236. [PMID: 32521763 PMCID: PMC7344861 DOI: 10.3390/metabo10060236] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/27/2020] [Accepted: 06/04/2020] [Indexed: 12/14/2022] Open
Abstract
The number, position, and configuration of double bonds in lipids affect membrane fluidity and the recruitment of signaling proteins. Studies on mammalian sphingolipids have focused on those with a saturated sphinganine or mono-unsaturated sphingosine long chain base. Using high-resolution liquid chromatography-tandem mass spectrometry (LC-MS/MS), we observed a marked accumulation of lipids containing a di-unsaturated sphingadiene base in the hippocampus of mice lacking the metabolic enzyme sphingosine kinase 2 (SphK2). The double bonds were localized to positions C4–C5 and C14–C15 of sphingadiene using ultraviolet photodissociation-tandem mass spectrometry (UVPD-MS/MS). Phosphorylation of sphingoid bases by sphingosine kinase 1 (SphK1) or SphK2 forms the penultimate step in the lysosomal catabolism of all sphingolipids. Both SphK1 and SphK2 phosphorylated sphinga-4,14-diene as efficiently as sphingosine, however deuterated tracer experiments in an oligodendrocyte cell line demonstrated that ceramides with a sphingosine base are more rapidly metabolized than those with a sphingadiene base. Since SphK2 is the dominant sphingosine kinase in brain, we propose that the accumulation of sphingadiene-based lipids in SphK2-deficient brains results from the slower catabolism of these lipids, combined with a bottleneck in the catabolic pathway created by the absence of SphK2. We have therefore uncovered a previously unappreciated role for SphK2 in lipid quality control.
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Affiliation(s)
- Timothy Andrew Couttas
- Centenary Institute, The University of Sydney, Camperdown, NSW 2006, Australia; (T.A.C.); (H.S.); (Y.Q.); (J.D.T.); (J.C.)
| | - Yepy Hardi Rustam
- Department of Biochemistry and Molecular Biology, The University of Melbourne, Melbourne, VIC 3010, Australia; (Y.H.R.); (G.E.R.)
| | - Huitong Song
- Centenary Institute, The University of Sydney, Camperdown, NSW 2006, Australia; (T.A.C.); (H.S.); (Y.Q.); (J.D.T.); (J.C.)
| | - Yanfei Qi
- Centenary Institute, The University of Sydney, Camperdown, NSW 2006, Australia; (T.A.C.); (H.S.); (Y.Q.); (J.D.T.); (J.C.)
| | - Jonathan David Teo
- Centenary Institute, The University of Sydney, Camperdown, NSW 2006, Australia; (T.A.C.); (H.S.); (Y.Q.); (J.D.T.); (J.C.)
| | - Jinbiao Chen
- Centenary Institute, The University of Sydney, Camperdown, NSW 2006, Australia; (T.A.C.); (H.S.); (Y.Q.); (J.D.T.); (J.C.)
| | - Gavin Edmund Reid
- Department of Biochemistry and Molecular Biology, The University of Melbourne, Melbourne, VIC 3010, Australia; (Y.H.R.); (G.E.R.)
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
- Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, VIC 3010, Australia
| | - Anthony Simon Don
- Centenary Institute, The University of Sydney, Camperdown, NSW 2006, Australia; (T.A.C.); (H.S.); (Y.Q.); (J.D.T.); (J.C.)
- NHMRC Clinical Trials Centre, Faculty of Medicine and Health, The University of Sydney, Camperdown, NSW 2006, Australia
- Correspondence: ; Tel.: +61-28627-5578
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8
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Ferrer I, Andrés-Benito P. White matter alterations in Alzheimer's disease without concomitant pathologies. Neuropathol Appl Neurobiol 2020; 46:654-672. [PMID: 32255227 PMCID: PMC7754505 DOI: 10.1111/nan.12618] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 03/23/2020] [Indexed: 12/14/2022]
Abstract
Aims Most individuals with AD neuropathological changes have co‐morbidities which have an impact on the integrity of the WM. This study analyses oligodendrocyte and myelin markers in the frontal WM in a series of AD cases without clinical or pathological co‐morbidities. Methods From a consecutive autopsy series, 206 cases had neuropathological changes of AD; among them, only 33 were AD without co‐morbidities. WM alterations were first evaluated in coronal sections of the frontal lobe in every case. Then, RT‐qPCR and immunohistochemistry were carried out in the frontal WM of AD cases without co‐morbidities to analyse the expression of selected oligodendrocyte and myelin markers. Results WM demyelination was more marked in AD with co‐morbidities when compared with AD cases without co‐morbidities. Regarding the later, mRNA expression levels of MBP, PLP1, CNP, MAG, MAL, MOG and MOBP were preserved at stages I–II/0–A when compared with middle‐aged (MA) individuals, but significantly decreased at stages III–IV/0–C. This was accompanied by reduced expression of NG2 and PDGFRA mRNA, reduced numbers of NG2‐, Olig2‐ and HDAC2‐immunoreactive cells and reduced glucose transporter immunoreactivity. Partial recovery of some of these markers occurred at stages V–VI/B–C. Conclusions The present observations demonstrate that co‐morbidities have an impact on WM integrity in the elderly and in AD, and that early alterations in oligodendrocytes and transcription of genes linked to myelin proteins in WM occur in AD cases without co‐morbidities. These are followed by partial recovery attempts at advanced stages. These observations suggest that oligodendrocytopathy is part of AD.
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Affiliation(s)
- I Ferrer
- Department of Pathology and Experimental Therapeutics, University of Barcelona, Barcelona, Spain.,Bellvitge University Hospital, Barcelona, Spain.,Ministry of Economy and Competitiveness, CIBERNED (Network Centre of Biomedical Research of Neurodegenerative Diseases), Institute of Health Carlos III, Barcelona, Spain.,Institute of Neurosciences, University of Barcelona, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
| | - P Andrés-Benito
- Department of Pathology and Experimental Therapeutics, University of Barcelona, Barcelona, Spain.,Ministry of Economy and Competitiveness, CIBERNED (Network Centre of Biomedical Research of Neurodegenerative Diseases), Institute of Health Carlos III, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
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9
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Lemay AM, Courtemanche O, Couttas TA, Jamsari G, Gagné A, Bossé Y, Joubert P, Don AS, Marsolais D. High FA2H and UGT8 transcript levels predict hydroxylated hexosylceramide accumulation in lung adenocarcinoma. J Lipid Res 2019; 60:1776-1786. [PMID: 31409741 DOI: 10.1194/jlr.m093955] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 08/05/2019] [Indexed: 12/14/2022] Open
Abstract
Lung cancer causes more deaths than any other cancer. Sphingolipids encompass metabolically interconnected species whose balance has pivotal effects on proliferation, migration, and apoptosis. In this study, we paralleled quantification of sphingolipid species with quantitative (q)PCR analyses of metabolic enzymes in order to identify dysregulated routes of sphingolipid metabolism in different subtypes of lung cancers. Lung samples were submitted to histopathological reexamination in order to confirm cancer type/subtype, which included adenocarcinoma histological subtypes and squamous cell and neuroendocrine carcinomas. Compared with benign lesions and tumor-free parenchyma, all cancers featured decreased sphingosine-1-phosphate and SMs. qPCR analyses evidenced differential mechanisms leading to these alterations between cancer types, with neuroendocrine carcinomas upregulating SGPL1, but CERT1 being downregulated in adenocarcinomas and squamous cell carcinomas. 2-Hydroxyhexosylceramides (2-hydroxyHexCers) were specifically increased in adenocarcinomas. While UDP-glycosyltransferase 8 (UGT8) transcript levels were increased in all cancer subtypes, fatty acid 2-hydroxylase (FA2H) levels were higher in adenocarcinomas than in squamous and neuroendocrine carcinomas. As a whole, we report differing mechanisms through which all forms of lung cancer achieve low SM and lysosphingolipids. Our results also demonstrate that FA2H upregulation is required for the accumulation of 2-hydroxyHexCers in lung cancers featuring high levels of UGT8.
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Affiliation(s)
- Anne-Marie Lemay
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Québec, QC G1V 4G5, Canada
| | - Olivier Courtemanche
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Québec, QC G1V 4G5, Canada
| | - Timothy A Couttas
- Centenary Institute, University of Sydney, Camperdown, NSW 2006, Australia.,Prince of Wales Clinical School, University of New South Wales, Sydney, NSW 2052, Australia
| | - Giuleta Jamsari
- Prince of Wales Clinical School, University of New South Wales, Sydney, NSW 2052, Australia
| | - Andréanne Gagné
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Québec, QC G1V 4G5, Canada
| | - Yohan Bossé
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Québec, QC G1V 4G5, Canada.,Departments of Molecular Medicine, Molecular Biology, Medical Biochemistry, Université Laval, Québec, QC G1V 0A6, Canada
| | - Philippe Joubert
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Québec, QC G1V 4G5, Canada.,Pathology, Université Laval, Québec, QC G1V 0A6, Canada
| | - Anthony S Don
- Centenary Institute, University of Sydney, Camperdown, NSW 2006, Australia.,Prince of Wales Clinical School, University of New South Wales, Sydney, NSW 2052, Australia.,National Health and Medical Research Council Clinical Trials Centre, University of Sydney, Camperdown, NSW 2006, Australia
| | - David Marsolais
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Québec, QC G1V 4G5, Canada .,Medicine, Université Laval, Québec, QC G1V 0A6, Canada
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10
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Couttas TA, Kain N, Tran C, Chatterton Z, Kwok JB, Don AS. Age-Dependent Changes to Sphingolipid Balance in the Human Hippocampus are Gender-Specific and May Sensitize to Neurodegeneration. J Alzheimers Dis 2019; 63:503-514. [PMID: 29660940 DOI: 10.3233/jad-171054] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The greatest risk factor for developing Alzheimer's disease (AD) is aging. The major genetic risk factor for AD is the ɛ4 allele of the APOE gene, encoding the brain's major lipid transport protein, apolipoprotein E (ApoE). The research community is yet to decipher why the ApoE4 variant pre-disposes to AD, and how aging causes the disease. Studies have shown deregulated levels of sphingolipids, including decreased levels of the neuroprotective signaling lipid sphingosine 1-phosphate (S1P), and increased ceramide content, in brain tissue and serum of people with pre-clinical or very early AD. In this study we investigated whether sphingolipid levels are affected as a function of age or APOE genotype, in the hippocampus of neurologically normal subjects over the age of 65. Lipids were quantified in 80 postmortem tissue samples using liquid chromatography tandem mass spectrometry (LC-MS/MS). Sphingolipid levels were not significantly affected by the presence of one ɛ4 or ɛ2 allele. However, ceramide, sphingomyelin, and sulfatide content was very significantly correlated with age in the hippocampus of males. On the other hand, S1P, normalized to its non-phosphorylated precursor sphingosine, was inversely correlated with age in females. Our results therefore establish gender-specific differences in sphingolipid metabolism in the aging human brain. Ceramide is a pro-apoptotic lipid, and heavily implicated as a driver of insulin resistance in metabolic tissues. S1P is a neuroprotective lipid that supports glutamatergic neurotransmission. Increasing ceramide and decreasing S1P levels may contribute significantly to a pro-neurodegenerative phenotype in the aging brain.
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Affiliation(s)
- Timothy A Couttas
- Centenary Institute, University of Sydney, NSW, Australia.,Prince of Wales Clinical School, UNSW Sydney, NSW, Australia
| | - Nupur Kain
- Prince of Wales Clinical School, UNSW Sydney, NSW, Australia
| | - Collin Tran
- Centenary Institute, University of Sydney, NSW, Australia.,Prince of Wales Clinical School, UNSW Sydney, NSW, Australia
| | - Zac Chatterton
- Brain and Mind Centre, Sydney Medical School, University of Sydney, NSW, Australia
| | - John B Kwok
- Brain and Mind Centre, Sydney Medical School, University of Sydney, NSW, Australia
| | - Anthony S Don
- Centenary Institute, University of Sydney, NSW, Australia.,Prince of Wales Clinical School, UNSW Sydney, NSW, Australia.,NHMRC Clinical Trials Centre, Sydney Medical School, University of Sydney, NSW, Australia
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11
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Next-generation biomarker discovery in Alzheimer's disease using metabolomics - from animal to human studies. Bioanalysis 2018; 10:1525-1546. [PMID: 30198770 DOI: 10.4155/bio-2018-0135] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Alzheimer's disease (AD) is a complex disease driven mainly by neuronal loss due to accumulation of intracellular neurofibrillary tangles and amyloid β aggregates in the brain. The diagnosis of AD currently relies on clinical symptoms while the disease can only be confirmed at autopsy. The few available biomarkers allowing for diagnosis are typically detected many years after the onset of the disease. New diagnostic approaches, particularly in easily-accessible biofluids, are essential. By providing an exhaustive information of the phenotype, metabolomics is an ideal approach for identification of new biomarkers. This review investigates the current position of metabolomics in the field of AD research, focusing on animal and human studies, and discusses the improvements carried out over the past decade.
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12
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Uncoupling N-acetylaspartate from brain pathology: implications for Canavan disease gene therapy. Acta Neuropathol 2018; 135:95-113. [PMID: 29116375 PMCID: PMC5756261 DOI: 10.1007/s00401-017-1784-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Revised: 10/31/2017] [Accepted: 11/01/2017] [Indexed: 11/25/2022]
Abstract
N-Acetylaspartate (NAA) is the second most abundant organic metabolite in the brain, but its physiological significance remains enigmatic. Toxic NAA accumulation appears to be the key factor for neurological decline in Canavan disease—a fatal neurometabolic disorder caused by deficiency in the NAA-degrading enzyme aspartoacylase. To date clinical outcome of gene replacement therapy for this spongiform leukodystrophy has not met expectations. To identify the target tissue and cells for maximum anticipated treatment benefit, we employed comprehensive phenotyping of novel mouse models to assess cell type-specific consequences of NAA depletion or elevation. We show that NAA-deficiency causes neurological deficits affecting unconscious defensive reactions aimed at protecting the body from external threat. This finding suggests, while NAA reduction is pivotal to treat Canavan disease, abrogating NAA synthesis should be avoided. At the other end of the spectrum, while predicting pathological severity in Canavan disease mice, increased brain NAA levels are not neurotoxic per se. In fact, in transgenic mice overexpressing the NAA synthesising enzyme Nat8l in neurons, supra-physiological NAA levels were uncoupled from neurological deficits. In contrast, elimination of aspartoacylase expression exclusively in oligodendrocytes elicited Canavan disease like pathology. Although conditional aspartoacylase deletion in oligodendrocytes abolished expression in the entire CNS, the remaining aspartoacylase in peripheral organs was sufficient to lower NAA levels, delay disease onset and ameliorate histopathology. However, comparable endpoints of the conditional and complete aspartoacylase knockout indicate that optimal Canavan disease gene replacement therapies should restore aspartoacylase expression in oligodendrocytes. On the basis of these findings we executed an ASPA gene replacement therapy targeting oligodendrocytes in Canavan disease mice resulting in reversal of pre-existing CNS pathology and lasting neurological benefits. This finding signifies the first successful post-symptomatic treatment of a white matter disorder using an adeno-associated virus vector tailored towards oligodendroglial-restricted transgene expression.
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13
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den Hoedt S, Janssen CI, Astarita G, Piomelli D, Leijten FP, Crivelli SM, Verhoeven AJ, de Vries HE, Walter J, Martinez-Martinez P, Sijbrands EJ, Kiliaan AJ, Mulder MT. Pleiotropic Effect of Human ApoE4 on Cerebral Ceramide and Saturated Fatty Acid Levels. J Alzheimers Dis 2017; 60:769-781. [DOI: 10.3233/jad-160739] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Sandra den Hoedt
- Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Carola I.F. Janssen
- Department of Anatomy, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Giuseppe Astarita
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington DC, USA
| | - Daniele Piomelli
- Department of Pharmacology, University of California Irvine, CA, USA
| | - Frank P.J. Leijten
- Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Simone M. Crivelli
- Department of Neuroscience, School for Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands
| | - Adrie J.M. Verhoeven
- Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Helga E. de Vries
- Department of Molecular Cell Biology and Immunology, Neuroscience Campus Amsterdam, VU Medical Center, Amsterdam, The Netherlands
| | - Jochen Walter
- Department of Neurology, University of Bonn, Bonn, Germany
| | - Pilar Martinez-Martinez
- Department of Neuroscience, School for Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands
| | - Eric J.G. Sijbrands
- Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Amanda J. Kiliaan
- Department of Anatomy, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Monique T. Mulder
- Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, The Netherlands
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14
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Lei M, Shafique A, Shang K, Couttas TA, Zhao H, Don AS, Karl T. Contextual fear conditioning is enhanced in mice lacking functional sphingosine kinase 2. Behav Brain Res 2017. [DOI: 10.1016/j.bbr.2017.06.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Hopiavuori BR, Agbaga MP, Brush RS, Sullivan MT, Sonntag WE, Anderson RE. Regional changes in CNS and retinal glycerophospholipid profiles with age: a molecular blueprint. J Lipid Res 2017; 58:668-680. [PMID: 28202633 PMCID: PMC5392743 DOI: 10.1194/jlr.m070714] [Citation(s) in RCA: 25] [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: 07/06/2016] [Revised: 02/13/2017] [Indexed: 12/16/2022] Open
Abstract
We present here a quantitative molecular blueprint of the three major glycerophospholipid (GPL) classes, phosphatidylcholine (PC), phosphatidylserine (PS), and phosphatidylethanolamine (PE), in retina and six regions of the brain in C57Bl6 mice at 2, 10, and 26 months of age. We found an age-related increase in molecular species containing saturated and monoenoic FAs and an overall decrease in the longer-chain PUFA molecular species across brain regions, with loss of DHA-containing molecular species as the most consistent and dramatic finding. Although we found very-long-chain PUFAs (VLC-PUFAs) (C28) in PC in the retina, no detectable levels were found in any brain region at any of the ages examined. All brain regions (except hippocampus and retina) showed a significant increase with age in PE plasmalogens. All three retina GPLs had di-PUFA molecular species (predominantly 44:12), which were most abundant in PS (∼30%). In contrast, low levels of di-PUFA GPL (1-2%) were found in all regions of the brain. This study provides a regional and age-related assessment of the brain's lipidome with a level of detail, inclusion, and quantification that has not heretofore been published.
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Affiliation(s)
- Blake R Hopiavuori
- Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104
| | - Martin-Paul Agbaga
- Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; Dean McGee Eye Institute, Oklahoma City, OK 73104
| | - Richard S Brush
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; Dean McGee Eye Institute, Oklahoma City, OK 73104
| | - Michael T Sullivan
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104
| | - William E Sonntag
- Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; Department of Geriatric Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104
| | - Robert E Anderson
- Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; Dean McGee Eye Institute, Oklahoma City, OK 73104.
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16
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Song Y, Cong P, Lu L, Wang Y, Tang Q, Zhang H, Xu J, Xue C. Effects of dietary glucocerebrosides from sea cucumber on the brain sphingolipid profiles of mouse models of Alzheimer's disease. Food Funct 2017; 8:1271-1281. [DOI: 10.1039/c6fo01659f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Alterations of sphingolipid levels in the hippocampus and cortex of normal, AD model, and SCG-treated mice.
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Affiliation(s)
- Yu Song
- College of Food Science and Engineering
- Ocean University of China
- China
| | - Peixu Cong
- College of Food Science and Engineering
- Ocean University of China
- China
| | - Ling Lu
- Ocean University of China
- China
| | - Yuming Wang
- College of Food Science and Engineering
- Ocean University of China
- China
| | - Qingjuan Tang
- College of Food Science and Engineering
- Ocean University of China
- China
| | - Hongwei Zhang
- Shandong Entry-Exit Inspection and Quarantine Bureau
- China
| | - Jie Xu
- College of Food Science and Engineering
- Ocean University of China
- China
| | - Changhu Xue
- College of Food Science and Engineering
- Ocean University of China
- China
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17
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Yu C, Gao J, Zhou Y, Chen X, Xiao R, Zheng J, Liu Y, Zhou H. Deep Phosphoproteomic Measurements Pinpointing Drug Induced Protective Mechanisms in Neuronal Cells. Front Physiol 2016; 7:635. [PMID: 28066266 PMCID: PMC5179568 DOI: 10.3389/fphys.2016.00635] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Accepted: 12/05/2016] [Indexed: 12/20/2022] Open
Abstract
Alzheimer's disease (AD) is a progressive and irreversible neurological disorder that impairs the living quality of old population and even life spans. New compounds have shown potential inneuroprotective effects in AD, such as GFKP-19, a 2-pyrrolidone derivative which has been proved to enhance the memory of dysmnesia mouse. The molecular mechanisms remain to be established for these drug candidates. Large-scale phosphoproteomic approach has been evolved rapidly in the last several years, which holds the potential to provide a useful toolkit to understand cellular signaling underlying drug effects. To establish and test such a method, we accurately analyzed the deep quantitative phosphoproteome of the neuro-2a cells treated with and without GFKP-19 using triple SILAC labeling. A total of 14,761 Class I phosphosites were quantified between controls, damaged, and protected conditions using the high resolution mass spectrometry, with a decent inter-mass spectrometer reproducibility for even subtle regulatory events. Our data suggests that GFKP-19 can reverse Aβ25−35 induced phosphorylation change in neuro-2a cells, and might protect the neuron system in two ways: firstly, it may decrease oxidative damage and inflammation induced by NO via down regulating the phosphorylation of nitric oxide synthase NOS1 at S847; Secondly, it may decrease tau protein phosphorylation through down-regulating the phosphorylation level of MAPK14 at T180. All mass spectrometry data are available via ProteomeXchange with identifier PXD005312.
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Affiliation(s)
- Chengli Yu
- Department of Analytical Chemistry and CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of SciencesShanghai, China; College of Pharmacy, University of Chinese Academy of Sciences, Chinese Academy of SciencesBeijing, China
| | - Jing Gao
- Department of Analytical Chemistry and CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences Shanghai, China
| | - Yanting Zhou
- Department of Analytical Chemistry and CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of SciencesShanghai, China; Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and TechnologyShanghai, China
| | - Xiangling Chen
- Department of Analytical Chemistry and CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of SciencesShanghai, China; College of Pharmacy, University of Chinese Academy of Sciences, Chinese Academy of SciencesBeijing, China
| | - Ruoxuan Xiao
- Department of Analytical Chemistry and CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of SciencesShanghai, China; College of Pharmacy, University of Chinese Academy of Sciences, Chinese Academy of SciencesBeijing, China
| | - Jing Zheng
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology Shanghai, China
| | - Yansheng Liu
- Department of Biology, Institute of Molecular Systems Biology, Swiss Federal Institute of Technology in Zurich Zurich, Switzerland
| | - Hu Zhou
- Department of Analytical Chemistry and CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of SciencesShanghai, China; College of Pharmacy, University of Chinese Academy of Sciences, Chinese Academy of SciencesBeijing, China
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18
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Mendis LHS, Grey AC, Faull RLM, Curtis MA. Hippocampal lipid differences in Alzheimer's disease: a human brain study using matrix-assisted laser desorption/ionization-imaging mass spectrometry. Brain Behav 2016; 6:e00517. [PMID: 27781133 PMCID: PMC5064331 DOI: 10.1002/brb3.517] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 05/18/2016] [Accepted: 05/21/2016] [Indexed: 11/11/2022] Open
Abstract
INTRODUCTION Alzheimer's disease (AD), the leading cause of dementia, is pathologically characterized by β-amyloid plaques and tau tangles. However, there is also evidence of lipid dyshomeostasis-mediated AD pathology. Given the structural diversity of lipids, mass spectrometry is a useful tool for studying lipid changes in AD. Although there have been a few studies investigating lipid changes in the human hippocampus in particular, there are few reports on how lipids change in each hippocampal subfield (e.g., Cornu Ammonis [CA] 1-4, dentate gyrus [DG] etc.). Since each subfield has its own function, we postulated that there could be lipid changes that are unique to each. METHODS We used matrix-assisted laser desorption/ionization-imaging mass spectrometry to investigate specific lipid changes in each subfield in AD. Data from the hippocampus region of six age- and gender-matched normal and AD pairs were analyzed with SCiLS lab 2015b software (SCiLS GmbH, Germany; RRID:SCR_014426), using an analysis workflow developed in-house. Hematoxylin, eosin, and luxol fast blue staining were used to precisely delineate each anatomical hippocampal subfield. Putative lipid identities, which were consistent with published data, were assigned using MS/MS. RESULTS Both positively and negatively charged lipid ion species were abundantly detected in normal and AD tissue. While the distribution pattern of lipids did not change in AD, the abundance of some lipids changed, consistent with trends that have been previously reported. However, our results indicated that the majority of these lipid changes specifically occur in the CA1 region. Additionally, there were many lipid changes that were specific to the DG. CONCLUSIONS Matrix-assisted laser desorption/ionization-imaging mass spectrometry and our analysis workflow provide a novel method to investigate specific lipid changes in hippocampal subfields. Future work will focus on elucidating the role that specific lipid differences in each subfield play in AD pathogenesis.
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Affiliation(s)
- Lakshini H. S. Mendis
- Centre for Brain ResearchFaculty of Medical and Health ScienceUniversity of AucklandAucklandNew Zealand
- Department of Anatomy and Medical Imaging Faculty of Medical and Health ScienceUniversity of AucklandAucklandNew Zealand
| | - Angus C. Grey
- Centre for Brain ResearchFaculty of Medical and Health ScienceUniversity of AucklandAucklandNew Zealand
- Department of PhysiologyFaculty of Medical and Health ScienceUniversity of AucklandAucklandNew Zealand
| | - Richard L. M. Faull
- Centre for Brain ResearchFaculty of Medical and Health ScienceUniversity of AucklandAucklandNew Zealand
- Department of Anatomy and Medical Imaging Faculty of Medical and Health ScienceUniversity of AucklandAucklandNew Zealand
| | - Maurice A. Curtis
- Centre for Brain ResearchFaculty of Medical and Health ScienceUniversity of AucklandAucklandNew Zealand
- Department of Anatomy and Medical Imaging Faculty of Medical and Health ScienceUniversity of AucklandAucklandNew Zealand
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19
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Couttas TA, Kain N, Suchowerska AK, Quek LE, Turner N, Fath T, Garner B, Don AS. Loss of ceramide synthase 2 activity, necessary for myelin biosynthesis, precedes tau pathology in the cortical pathogenesis of Alzheimer's disease. Neurobiol Aging 2016; 43:89-100. [PMID: 27255818 DOI: 10.1016/j.neurobiolaging.2016.03.027] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 03/01/2016] [Accepted: 03/27/2016] [Indexed: 01/07/2023]
Abstract
The anatomical progression of neurofibrillary tangle pathology throughout Alzheimer's disease (AD) pathogenesis runs inverse to the pattern of developmental myelination, with the disease preferentially affecting thinly myelinated regions. Myelin is comprised 80% of lipids, and the prototypical myelin lipids, galactosylceramide, and sulfatide are critical for neurological function. We observed severe depletion of galactosylceramide and sulfatide in AD brain tissue, which can be traced metabolically to the loss of their biosynthetic precursor, very long chain ceramide. The synthesis of very long chain ceramides is catalyzed by ceramide synthase 2 (CERS2). We demonstrate a significant reduction in CERS2 activity as early as Braak stage I/II in temporal cortex, and Braak stage III/IV in hippocampus and frontal cortex, indicating that loss of myelin-specific ceramide synthase activity precedes neurofibrillary tangle pathology in cortical regions. These findings open a new vista on AD pathogenesis by demonstrating a defect in myelin lipid biosynthesis at the preclinical stages of the disease. We posit that, over time, this defect contributes significantly to myelin deterioration, synaptic dysfunction, and neurological decline.
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Affiliation(s)
- Timothy A Couttas
- Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia
| | - Nupur Kain
- Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia
| | - Alexandra K Suchowerska
- School of Medical Sciences, Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia
| | - Lake-Ee Quek
- School of Medical Sciences, Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia
| | - Nigel Turner
- School of Medical Sciences, Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia
| | - Thomas Fath
- School of Medical Sciences, Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia
| | - Brett Garner
- Illawarra Health and Medical Research Institute, School of Biological Sciences, University of Wollongong, Wollongong, NSW, Australia
| | - Anthony S Don
- Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia.
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20
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Bascoul-Colombo C, Guschina IA, Maskrey BH, Good M, O'Donnell VB, Harwood JL. Dietary DHA supplementation causes selective changes in phospholipids from different brain regions in both wild type mice and the Tg2576 mouse model of Alzheimer's disease. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:524-37. [PMID: 26968097 PMCID: PMC4847476 DOI: 10.1016/j.bbalip.2016.03.005] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 02/29/2016] [Accepted: 03/04/2016] [Indexed: 12/11/2022]
Abstract
Alzheimer's disease (AD) is of major concern in ageing populations and we have used the Tg2576 mouse model to understand connections between brain lipids and amyloid pathology. Because dietary docosahexaenoic acid (DHA) has been identified as beneficial, we compared mice fed with a DHA-supplemented diet to those on a nutritionally-sufficient diet. Major phospholipids from cortex, hippocampus and cerebellum were separated and analysed. Each phosphoglyceride had a characteristic fatty acid composition which was similar in cortex and hippocampus but different in the cerebellum. The biggest changes on DHA-supplementation were within ethanolamine phospholipids which, together with phosphatidylserine, had the highest proportions of DHA. Reciprocal alterations in DHA and arachidonate were found. The main diet-induced alterations were found in ethanolamine phospholipids, (and included their ether derivatives), as were the changes observed due to genotype. Tg mice appeared more sensitive to diet with generally lower DHA percentages when on the standard diet and higher relative proportions of DHA when the diet was supplemented. All four major phosphoglycerides analysed showed age-dependent decreases in polyunsaturated fatty acid contents. These data provide, for the first time, a detailed evaluation of phospholipids in different brain areas previously shown to be relevant to behaviour in the Tg2576 mouse model for AD. The lipid changes observed with genotype are consistent with the subtle alterations found in AD patients, especially for the ethanolamine phospholipid molecular species. They also emphasise the contrasting changes in fatty acid content induced by DHA supplementation within individual phospholipid classes.
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Affiliation(s)
- Cécile Bascoul-Colombo
- School of Biosciences, Cardiff University, Cardiff CF10 3AX, UK; School of Psychology, Cardiff University, Cardiff CF10 3AT, UK
| | | | | | - Mark Good
- School of Psychology, Cardiff University, Cardiff CF10 3AT, UK
| | | | - John L Harwood
- School of Biosciences, Cardiff University, Cardiff CF10 3AX, UK.
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21
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Canela N, Herrero P, Mariné S, Nadal P, Ras MR, Rodríguez MÁ, Arola L. Analytical methods in sphingolipidomics: Quantitative and profiling approaches in food analysis. J Chromatogr A 2015; 1428:16-38. [PMID: 26275862 DOI: 10.1016/j.chroma.2015.07.110] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 07/27/2015] [Accepted: 07/31/2015] [Indexed: 02/07/2023]
Abstract
In recent years, sphingolipidomics has emerged as an interesting omic science that encompasses the study of the full sphingolipidome characterization, content, structure and activity in cells, tissues or organisms. Like other omics, it has the potential to impact biomarker discovery, drug development and systems biology knowledge. Concretely, dietary food sphingolipids have gained considerable importance due to their extensively reported bioactivity. Because of the complexity of this lipid family and their diversity among foods, powerful analytical methodologies are needed for their study. The analytical tools developed in the past have been improved with the enormous advances made in recent years in mass spectrometry (MS) and chromatography, which allow the convenient and sensitive identification and quantitation of sphingolipid classes and form the basis of current sphingolipidomics methodologies. In addition, novel hyphenated nuclear magnetic resonance (NMR) strategies, new ionization strategies, and MS imaging are outlined as promising technologies to shape the future of sphingolipid analyses. This review traces the analytical methods of sphingolipidomics in food analysis concerning sample extraction, chromatographic separation, the identification and quantification of sphingolipids by MS and their structural elucidation by NMR.
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Affiliation(s)
- Núria Canela
- Centre for Omic Sciences, Universitat Rovira i Virgili (COS-URV), Spain
| | - Pol Herrero
- Centre for Omic Sciences, Universitat Rovira i Virgili (COS-URV), Spain
| | - Sílvia Mariné
- Centre for Omic Sciences, Universitat Rovira i Virgili (COS-URV), Spain
| | - Pedro Nadal
- Centre for Omic Sciences, Universitat Rovira i Virgili (COS-URV), Spain
| | - Maria Rosa Ras
- Centre for Omic Sciences, Universitat Rovira i Virgili (COS-URV), Spain
| | | | - Lluís Arola
- Centre for Omic Sciences, Universitat Rovira i Virgili (COS-URV), Spain.
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Cong PX, Gao RC, Xue CH, Li ZJ, Zhang HW, Khan MN, Xue Y, Sugawara T, Xu J. Molecular species analysis of monosialogangliosides from sea urchin Strongylocentrotus nudus by RPLC-ESI-MS/MS. Food Chem 2015; 166:473-478. [DOI: 10.1016/j.foodchem.2014.06.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 10/23/2013] [Accepted: 06/08/2014] [Indexed: 11/15/2022]
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23
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Jia Z, Li S, Cong P, Wang Y, Sugawara T, Xue C, Xu J. High Throughput Analysis of Cerebrosides from the Sea Cucumber Pearsonothria graeffei by Liquid Chromatography—Quadrupole-Time-of-Flight Mass Spectrometry. J Oleo Sci 2015; 64:51-60. [DOI: 10.5650/jos.ess14136] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Zicai Jia
- College of Food Science and Engineering, Ocean University of China
| | - Shiyan Li
- Aquatic Products Quality Testing Center of Zhejiang Province
| | - Peixu Cong
- College of Food Science and Engineering, Ocean University of China
| | - Yuming Wang
- College of Food Science and Engineering, Ocean University of China
| | - Tatsuya Sugawara
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
| | - Changhu Xue
- College of Food Science and Engineering, Ocean University of China
| | - Jie Xu
- College of Food Science and Engineering, Ocean University of China
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Botas A, Campbell HM, Han X, Maletic-Savatic M. Metabolomics of Neurodegenerative Diseases. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2015; 122:53-80. [DOI: 10.1016/bs.irn.2015.05.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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25
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Plasma lipidomics analysis finds long chain cholesteryl esters to be associated with Alzheimer's disease. Transl Psychiatry 2015; 5:e494. [PMID: 25585166 PMCID: PMC4312824 DOI: 10.1038/tp.2014.127] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 09/28/2014] [Accepted: 10/26/2014] [Indexed: 12/17/2022] Open
Abstract
There is an urgent need for the identification of Alzheimer's disease (AD) biomarkers. Studies have now suggested the promising use of associations with blood metabolites as functional intermediate phenotypes in biomedical and pharmaceutical research. The aim of this study was to use lipidomics to identify a battery of plasma metabolite molecules that could predict AD patients from controls. We performed a comprehensive untargeted lipidomic analysis, using ultra-performance liquid chromatography/mass spectrometry on plasma samples from 35 AD patients, 40 elderly controls and 48 individuals with mild cognitive impairment (MCI) and used multivariate analysis methods to identify metabolites associated with AD status. A combination of 10 metabolites could discriminate AD patients from controls with 79.2% accuracy (81.8% sensitivity, 76.9% specificity and an area under curve of 0.792) in a novel test set. Six of the metabolites were identified as long chain cholesteryl esters (ChEs) and were reduced in AD (ChE 32:0, odds ratio (OR)=0.237, 95% confidence interval (CI)=0.10-0.48, P=4.19E-04; ChE 34:0, OR=0.152, 95% CI=0.05-0.37, P=2.90E-04; ChE 34:6, OR=0.126, 95% CI=0.03-0.35, P=5.40E-04; ChE 32:4, OR=0.056, 95% CI=0.01-0.24, P=6.56E-04 and ChE 33:6, OR=0.205, 95% CI=0.06-0.50, P=2.21E-03, per (log2) metabolite unit). The levels of these metabolites followed the trend control>MCI>AD. We, additionally, found no association between cholesterol, the precursor of ChE and AD. This study identified new ChE molecules, involved in cholesterol metabolism, implicated in AD, which may help identify new therapeutic targets; although, these findings need to be replicated in larger well-phenotyped cohorts.
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A Three-Step Assay for Ceramide Synthase Activity Using a Fluorescent Substrate and HPLC. Lipids 2014; 50:101-9. [DOI: 10.1007/s11745-014-3969-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Accepted: 11/01/2014] [Indexed: 10/24/2022]
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Don AS, Hsiao JHT, Bleasel JM, Couttas TA, Halliday GM, Kim WS. Altered lipid levels provide evidence for myelin dysfunction in multiple system atrophy. Acta Neuropathol Commun 2014; 2:150. [PMID: 25358962 PMCID: PMC4228091 DOI: 10.1186/s40478-014-0150-6] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 10/08/2014] [Indexed: 01/11/2023] Open
Abstract
Multiple system atrophy (MSA) is a rapidly-progressive neurodegenerative disease characterized by parkinsonism, cerebellar ataxia and autonomic failure. A pathological hallmark of MSA is the presence of α-synuclein deposits in oligodendrocytes, the myelin-producing support cells of the brain. Brain pathology and in vitro studies indicate that myelin instability may be an early event in the pathogenesis of MSA. Lipid is a major constituent (78% w/w) of myelin and has been implicated in myelin dysfunction in MSA. However, changes, if any, in lipid level/distribution in MSA brain are unknown. Here, we undertook a comprehensive analysis of MSA myelin. We quantitatively measured three groups of lipids, sphingomyelin, sulfatide and galactosylceramide, which are all important in myelin integrity and function, in affected (under the motor cortex) and unaffected (under the visual cortex) white matter regions. For all three groups of lipids, most of the species were severely decreased (40-69%) in affected but not unaffected MSA white matter. An analysis of the distribution of lipid species showed no significant shift in fatty acid chain length/content with MSA. The decrease in lipid levels was concomitant with increased α-synuclein expression. These data indicate that the absolute levels, and not distribution, of myelin lipids are altered in MSA, and provide evidence for myelin lipid dysfunction in MSA pathology. We propose that dysregulation of myelin lipids in the course of MSA pathogenesis may trigger myelin instability.
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Affiliation(s)
- Anthony S Don
- />Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052 Australia
| | - Jen-Hsiang T Hsiao
- />Neuroscience Research Australia, Barker St, Randwick, NSW 2031 Australia
| | - Jonathan M Bleasel
- />Neuroscience Research Australia, Barker St, Randwick, NSW 2031 Australia
| | - Timothy A Couttas
- />Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052 Australia
| | - Glenda M Halliday
- />Neuroscience Research Australia, Barker St, Randwick, NSW 2031 Australia
- />School of Medical Sciences, University of New South Wales, Sydney, NSW 2052 Australia
| | - Woojin Scott Kim
- />Neuroscience Research Australia, Barker St, Randwick, NSW 2031 Australia
- />School of Medical Sciences, University of New South Wales, Sydney, NSW 2052 Australia
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Liu Q, Zhang J. Lipid metabolism in Alzheimer's disease. Neurosci Bull 2014; 30:331-45. [PMID: 24733655 DOI: 10.1007/s12264-013-1410-3] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Accepted: 02/25/2014] [Indexed: 12/14/2022] Open
Abstract
Lipids play crucial roles in cell signaling and various physiological processes, especially in the brain. Impaired lipid metabolism in the brain has been implicated in neurodegenerative diseases, such as Alzheimer's disease (AD), and other central nervous system insults. The brain contains thousands of lipid species, but the complex lipid compositional diversity and the function of each of lipid species are currently poorly understood. This review integrates current knowledge about major lipid changes with the molecular mechanisms that underlie AD pathogenesis.
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Affiliation(s)
- Qiang Liu
- CAS Key Laboratory of Brain Function and Disease and School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China,
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Wu Z, Shon JC, Liu KH. Mass Spectrometry-based Lipidomics and Its Application to Biomedical Research. J Lifestyle Med 2014; 4:17-33. [PMID: 26064851 PMCID: PMC4390758 DOI: 10.15280/jlm.2014.4.1.17] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 03/14/2014] [Indexed: 11/22/2022] Open
Abstract
Lipidomics, a branch of metabolomics, is the large-scale study of pathways and networks of all cellular lipids in biological systems such as cells, tissues or organisms. The recent advance in mass spectrometry technologies have enabled more comprehensive lipid profiling in the biological samples. In this review, we compared four representative lipid profiling technoligies including GC-MS, LC-MS, direct infusion-MS and imaging-MS. We also summarized representative lipid database, and further discussed the applications of lipidomics to the diagnostics of various diseases such as diabetes, obesity, hypertension, and Alzheimer diseases.
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Affiliation(s)
- Zhexue Wu
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, Korea
| | - Jong Cheol Shon
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, Korea
| | - Kwang-Hyeon Liu
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, Korea
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The impact of cholesterol, DHA, and sphingolipids on Alzheimer's disease. BIOMED RESEARCH INTERNATIONAL 2014; 2013:814390. [PMID: 24575399 PMCID: PMC3929518 DOI: 10.1155/2013/814390] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 07/13/2013] [Indexed: 12/14/2022]
Abstract
Alzheimer's disease (AD) is a devastating neurodegenerative disorder currently affecting over 35 million people worldwide. Pathological hallmarks of AD are massive amyloidosis, extracellular senile plaques, and intracellular neurofibrillary tangles accompanied by an excessive loss of synapses. Major constituents of senile plaques are 40–42 amino acid long peptides termed β-amyloid (Aβ). Aβ is produced by sequential proteolytic processing of the amyloid precursor protein (APP). APP processing and Aβ production have been one of the central scopes in AD research in the past. In the last years, lipids and lipid-related issues are more frequently discussed to contribute to the AD pathogenesis. This review summarizes lipid alterations found in AD postmortem brains, AD transgenic mouse models, and the current understanding of how lipids influence the molecular mechanisms leading to AD and Aβ generation, focusing especially on cholesterol, docosahexaenoic acid (DHA), and sphingolipids/glycosphingolipids.
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Abstract
Alzheimer's disease (AD) is an irreversible, progressive brain disease and can be definitively diagnosed after death through an examination of senile plaques and neurofibrillary tangles in several brain regions. It is to be expected that changes in the concentration and/or localization of low-molecular-weight molecules are linked to the pathological changes that occur in AD, and determining their identity would provide valuable information regarding AD processes. Here, we propose definitive brain metabolic profiling using ultra-performance liquid chromatography coupled with electrospray time-of-flight mass spectrometry analysis. The acquired data were subjected to principal components analysis to differentiate the frontal and parietal lobes of the AD/Control groups. Significant differences in the levels of spermine and spermidine were identified using S-plot, mass spectra, databases and standards. Based on the investigation of the polyamine metabolite pathway, these data establish that the downstream metabolites of ornithine are increased, potentially implicating ornithine decarboxylase activity in AD pathology.
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Abuhusain HJ, Matin A, Qiao Q, Shen H, Kain N, Day BW, Stringer BW, Daniels B, Laaksonen MA, Teo C, McDonald KL, Don AS. A metabolic shift favoring sphingosine 1-phosphate at the expense of ceramide controls glioblastoma angiogenesis. J Biol Chem 2013; 288:37355-64. [PMID: 24265321 DOI: 10.1074/jbc.m113.494740] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Studies in cell culture and mouse models of cancer have indicated that the soluble sphingolipid metabolite sphingosine 1-phosphate (S1P) promotes cancer cell proliferation, survival, invasiveness, and tumor angiogenesis. In contrast, its metabolic precursor ceramide is prodifferentiative and proapoptotic. To determine whether sphingolipid balance plays a significant role in glioma malignancy, we undertook a comprehensive analysis of sphingolipid metabolites in human glioma and normal gray matter tissue specimens. We demonstrate, for the first time, a systematic shift in sphingolipid metabolism favoring S1P over ceramide, which increases with increasing cancer grade. S1P content was, on average, 9-fold higher in glioblastoma tissues compared with normal gray matter, whereas the most abundant form of ceramide in the brain, C18 ceramide, was on average 5-fold lower. Increased S1P content in the tumors was significantly correlated with increased sphingosine kinase 1 (SPHK1) and decreased sphingosine phosphate phosphatase 2 (SGPP2) expression. Inhibition of S1P production by cultured glioblastoma cells, using a highly potent and selective SPHK1 inhibitor, blocked angiogenesis in cocultured endothelial cells without affecting VEGF secretion. Our findings validate the hypothesis that an altered ceramide/S1P balance is an important feature of human cancers and support the development of SPHK1 inhibitors as antiangiogenic agents for cancer therapy.
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Abstract
Members of the ABCA (ATP-binding cassette subfamily A) family are characterized by their ability to transport lipids across cellular membranes and regulate lipid homoeostasis in the brain and peripheral tissues. ABCA8 is a little-known member of this subfamily that was originally cloned from human brain libraries and has no known function. In an effort to elucidate the role of ABCA8 in the brain we first undertook a comprehensive analysis of its expression in the human brain. ABCA8 was differentially expressed in multiple regions of adult human brains with significantly higher expression in oligodendrocyte-enriched white matter regions compared with grey matter cortical regions. We then assessed the impact of ABCA8 on sphingomyelin production in oligodendrocyte and showed that ABCA8 was able to significantly stimulate both sphingomyelin synthase 1 expression and sphingomyelin production. Furthermore, ABCA8 expression in the prefrontal cortex across the human life span correlated strongly with age-associated myelination, and the myelinating gene p25α was significantly up-regulated with ABCA8. The present study represents the first extensive expression and functional study of ABCA8 in the human brain and the results strongly suggest that ABCA8 regulates lipid metabolism in oligodendrocytes and potentially plays a role in myelin formation and maintenance.
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An Improved High-Throughput Lipid Extraction Method for the Analysis of Human Brain Lipids. Lipids 2013; 48:307-18. [DOI: 10.1007/s11745-013-3760-z] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 12/24/2012] [Indexed: 10/27/2022]
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de la Monte SM, Re E, Longato L, Tong M. Dysfunctional pro-ceramide, ER stress, and insulin/IGF signaling networks with progression of Alzheimer's disease. J Alzheimers Dis 2012; 30 Suppl 2:S217-29. [PMID: 22297646 DOI: 10.3233/jad-2012-111728] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In Alzheimer's disease (AD), brain insulin and insulin-like growth factor (IGF) resistance and deficiency begin early, and worsen with severity of disease. The factors mediating progression of brain insulin/IGF resistance in AD are not well understood. We hypothesize that AD progression is mediated via negative cross-talk that promotes toxic ceramide generation and endoplasmic reticulum (ER) stress. The rationale is that insulin resistance dysregulates lipid metabolism and promotes ceramide accumulation, and thereby increases inflammation and stress. Consequences include disruption of cytoskeletal function and AβPP-Aβ secretion. The present study correlates AD stage with activation of pro-ceramide genes, ceramide levels, and molecular indices of ER stress in postmortem human brain tissue. The results demonstrated that in AD, brain insulin/IGF resistance was associated with constitutive activation of multiple pro-ceramide genes, increased ceramide levels, and increased expression of pro-ER stress pathway genes and proteins. Expression of several pro-ceramide and pro-apoptotic ER stress pathway molecules increased with AD severity and brain insulin/IGF resistance. In contrast, ER stress molecules that help maintain homeostasis with respect to unfolded protein responses were mainly upregulated in the intermediate rather than late stage of AD. These findings support our hypothesis that in AD, a triangulated mal-signaling network initiated by brain insulin/IGF resistance is propagated by the dysregulation of ceramide and ER stress homeostasis, which themselves promote insulin resistance. Therefore, once established, this reverberating loop must be targeted using multi-pronged approaches to disrupt the AD neurodegeneration cascade.
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Affiliation(s)
- Suzanne M de la Monte
- Department of Pathology (Neuropathology), Rhode Island Hospital and The Warren Alpert Medical School of Brown University, Providence, RI, USA. Suzanne DeLaMonte
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Abstract
Alzheimer's disease (AD) is a cognitive disorder with a number of complex neuropathologies, including, but not limited to, neurofibrillary tangles, neuritic plaques, neuronal shrinkage, hypomyelination, neuroinflammation and cholinergic dysfunction. The role of underlying pathological processes in the evolution of the cholinergic deficit responsible for cognitive decline has not been elucidated. Furthermore, generation of testable hypotheses for defining points of pharmacological intervention in AD are complicated by the large scale occurrence of older individuals dying with no cognitive impairment despite having a high burden of AD pathology (plaques and tangles). To further complicate these research challenges, there is no animal model that reproduces the combined hallmark neuropathologies of AD. These research limitations have stimulated the application of 'omics' technologies in AD research with the goals of defining biologic markers of disease and disease progression and uncovering potential points of pharmacological intervention for the design of AD therapeutics. In the case of sporadic AD, the dominant form of dementia, genomics has revealed that the ε4 allele of apolipoprotein E, a lipid transport/chaperone protein, is a susceptibility factor. This seminal observation points to the importance of lipid dynamics as an area of investigation in AD. In this regard, lipidomics studies have demonstrated that there are major deficits in brain structural glycerophospholipids and sphingolipids, as well as alterations in metabolites of these complex structural lipids, which act as signaling molecules. Peroxisomal dysfunction appears to be a key component of the changes in glycerophospholipid deficits. In this review, lipid alterations and their potential roles in the pathophysiology of AD are discussed.
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Affiliation(s)
- Paul L Wood
- Metabolomics Unit, Department of Pharmacology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, 6965 Cumberland Gap Parkway, Harrogate, TN 37752, USA.
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Cobucci-Ponzano B, Moracci M. Glycosynthases as tools for the production of glycan analogs of natural products. Nat Prod Rep 2012; 29:697-709. [DOI: 10.1039/c2np20032e] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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