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Kwarteng DO, Gangoda M, Kooijman EE. The effect of methylated phosphatidylethanolamine derivatives on the ionization properties of signaling phosphatidic acid. Biophys Chem 2023; 296:107005. [PMID: 36934676 DOI: 10.1016/j.bpc.2023.107005] [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: 02/03/2023] [Accepted: 03/07/2023] [Indexed: 03/16/2023]
Abstract
Phosphatidylethanolamine (PE) and Phosphatidylcholine (PC) are the most abundant glycerophospholipids in eukaryotic membranes. The differences in the physicochemical properties of their headgroups have contrasting modulatory effects on their interaction with intracellular macromolecules. As such, their overall impact on membrane structure and function differs significantly. Enzymatic methylation of PE's amine headgroup produces two methylated derivatives namely monomethyl PE (MMPE) and dimethyl PE (DMPE) which have physicochemical properties that generally range between that of PE and PC. Additionally, their influence on membrane properties differs from both PE and PC. Although variations in headgroup methylation have been reported to affect signaling pathways, the direct influence that these differences exert on the ionization properties of signaling phospholipids have not been investigated. Here, we briefly review membrane function and structure that are mediated by the differences in headgroup methylation between PE, MMPE, DMPE and PC. In addition, using 31P MAS NMR, we investigate the effect of these four phospholipids on the ionization properties of the ubiquitous signaling anionic lipid phosphatidic acid (PA). Our results show that PA's ionization properties are differentially affected by changes in phospholipid headgroup methylation. This could have important implications for PA-protein binding and hence physiological functions in cells where signaling events lead to changes in abundance of methylated PE derivatives in the membrane.
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Affiliation(s)
- Desmond Owusu Kwarteng
- Department of Biological Sciences, Kent State University, P.O. Box 5190, Kent, OH 44242, USA.
| | - Mahinda Gangoda
- Department of Chemistry & Biochemistry, Kent State University, P.O. Box 5190, Kent, OH 44242, USA
| | - Edgar E Kooijman
- Department of Biological Sciences, Kent State University, P.O. Box 5190, Kent, OH 44242, USA.
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2
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Leroux M, Luquain-Costaz C, Lawton P, Azzouz-Maache S, Delton I. Fatty Acid Composition and Metabolism in Leishmania Parasite Species: Potential Biomarkers or Drug Targets for Leishmaniasis? Int J Mol Sci 2023; 24:ijms24054702. [PMID: 36902138 PMCID: PMC10003364 DOI: 10.3390/ijms24054702] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 02/22/2023] [Accepted: 02/26/2023] [Indexed: 03/06/2023] Open
Abstract
Fatty acids have received growing interest in Leishmania biology with the characterization of the enzymes allowing the complete fatty acid synthesis of this trypanosomatid parasite. This review presents a comparative analysis of the fatty acid profiles of the major classes of lipids and phospholipids in different species of Leishmania with cutaneous or visceral tropism. Specificities relating to the parasite forms, resistance to antileishmanial drugs, and host/parasite interactions are described as well as comparisons with other trypanosomatids. Emphasis is placed on polyunsaturated fatty acids and their metabolic and functional specificities, in particular, their conversion into oxygenated metabolites that are inflammatory mediators able to modulate metacyclogenesis and parasite infectivity. The impact of lipid status on the development of leishmaniasis and the potential of fatty acids as therapeutic targets or candidates for nutritional interventions are discussed.
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Affiliation(s)
- Marine Leroux
- CNRS 5007, LAGEPP, Université of Lyon, Université Claude Bernard Lyon 1, 69100 Villeurbanne, France
| | - Céline Luquain-Costaz
- CNRS 5007, LAGEPP, Université of Lyon, Université Claude Bernard Lyon 1, 69100 Villeurbanne, France
- Department of Biosciences, INSA Lyon, 69100 Villeurbanne, France
| | - Philippe Lawton
- CNRS 5007, LAGEPP, Université of Lyon, Université Claude Bernard Lyon 1, 69100 Villeurbanne, France
| | - Samira Azzouz-Maache
- CNRS 5007, LAGEPP, Université of Lyon, Université Claude Bernard Lyon 1, 69100 Villeurbanne, France
| | - Isabelle Delton
- CNRS 5007, LAGEPP, Université of Lyon, Université Claude Bernard Lyon 1, 69100 Villeurbanne, France
- Department of Biosciences, INSA Lyon, 69100 Villeurbanne, France
- Correspondence:
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3
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Cerone M, Roberts M, Smith TK. The lipidome of Crithidia fasiculataand its plasticity. Front Cell Infect Microbiol 2022; 12:945750. [DOI: 10.3389/fcimb.2022.945750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 09/13/2022] [Indexed: 11/13/2022] Open
Abstract
Crithidia fasiculata belongs to the trypanosomatidae order of protozoan parasites, bearing close relation to other kinetoplastid parasites such as Trypanosoma brucei and Leishmania spp. As an early diverging lineage of eukaryotes, the study of kinetoplastid parasites has provided unique insights into alternative mechanisms to traditional eukaryotic metabolic pathways. Crithidia are a monogenetic parasite for mosquito species and have two distinct lifecycle stages both taking place in the mosquito gut. These consist of a motile choanomastigote form and an immotile amastigote form morphologically similar to amastigotes in Leishmania. Owing to their close relation to Leishmania, Crithidia are a growing research tool, with continuing interest in its use as a model organism for kinetoplastid research with the added benefit that they are non-pathogenic to humans and can be grown with no special equipment or requirements for biological containment. Although comparatively little research has taken place on Crithidia, similarities to other kinetoplast species has been shown in terms of energy metabolism and genetics. Crithidia also show similarities to kinetoplastids in their production of the monosaccharide D-arabinopyranose similar to Leishmania, which is incorporated into a lipoarabinogalactan a major cell surface GPI-anchored molecule. Additionally, Crithidia have been used as a eukaryotic expression system to express proteins from other kinetoplastids and potentially other eukaryotes including human proteins allowing various co- and post-translational protein modifications to the recombinant proteins. Despite the obvious usefulness and potential of this organism very little is known about its lipid metabolism. Here we describe a detailed lipidomic analyses and demonstrate the possible placidity of Crithidia’s lipid metabolis. This could have important implications for biotechnology approaches and how other kinetoplastids interact with, and scavenge nutrients from their hosts.
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4
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Bouabid C, Yamaryo-Botté Y, Rabhi S, Bichiou H, Hkimi C, Bouglita W, Chaouach M, Eddaikra N, Ghedira K, Guizani-Tabbane L, Botté CY, Rabhi I. Fatty Acid Profiles of Leishmania major Derived from Human and Rodent Hosts in Endemic Cutaneous Leishmaniasis Areas of Tunisia and Algeria. Pathogens 2022; 11:92. [PMID: 35056040 PMCID: PMC8781279 DOI: 10.3390/pathogens11010092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/22/2021] [Accepted: 12/22/2021] [Indexed: 11/16/2022] Open
Abstract
Leishmaniasis is a protozoal vector-borne disease that affects both humans and animals. In the Mediterranean Basin, the primary reservoir hosts of Leishmania spp. are mainly rodents and canids. Lipidomic approaches have allowed scientists to establish Leishmania spp. lipid profiles for the identification of cell stage specific biomarkers, drug mechanisms of action, and host immune response. Using an in silico approach of global network interaction between genes involved in fatty acid (FA) synthesis followed by the GC-MS approach, we were able to characterize the fatty acid profiles of L. major derived from human and rodent hosts. Our results revealed that the lipid profile of L. major showed similarities and differences with those already reported for other Leishmania species. Phospholipids are the predominant lipid class. FA composition of rodent parasites was characterized by a lower abundance of the precursor C18:2(n-6). One of the rodent clones, which also expressed the lowest lipid abundance in PL and TAG, was the least sensitive clone to the miltefosine drug and has the lowest infection efficiency. Our findings suggest that the lipid composition variation may explain the response of the parasite toward treatment and their ability to infect their host.
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Affiliation(s)
- Cyrine Bouabid
- Laboratoire de Parasitologie Médicale, Biotechnologies et Biomolécules (LR16IPT06), Institut Pasteur de Tunis, Université Tunis El-Manar, 13 Place Pasteur-BP74, Tunis 1002, Tunisia
| | - Yoshiki Yamaryo-Botté
- ApicoLipid Team, Institute for Advanced Biosciences, CNRS UMR5309, INSERM-National Institute for Health and Medical Research, Université Grenoble Alpes, INSERM U1209, 38000 Grenoble, France
| | - Sameh Rabhi
- Laboratoire de Parasitologie Médicale, Biotechnologies et Biomolécules (LR16IPT06), Institut Pasteur de Tunis, Université Tunis El-Manar, 13 Place Pasteur-BP74, Tunis 1002, Tunisia
| | - Haifa Bichiou
- Laboratoire de Parasitologie Médicale, Biotechnologies et Biomolécules (LR16IPT06), Institut Pasteur de Tunis, Université Tunis El-Manar, 13 Place Pasteur-BP74, Tunis 1002, Tunisia
| | - Chaima Hkimi
- Laboratory of Bioinformatics, BioMathematics and Biostatistics, Institut Pasteur de Tunis, 13 Place Pasteur-BP74, Tunis 1002, Tunisia
| | - Wafa Bouglita
- Laboratoire de Parasitologie Médicale, Biotechnologies et Biomolécules (LR16IPT06), Institut Pasteur de Tunis, Université Tunis El-Manar, 13 Place Pasteur-BP74, Tunis 1002, Tunisia
- Higher Institute of Biotechnology of Sidi Thabet, University of Manouba, Tunis 2050, Tunisia
| | - Melek Chaouach
- Laboratoire de Parasitologie Médicale, Biotechnologies et Biomolécules (LR16IPT06), Institut Pasteur de Tunis, Université Tunis El-Manar, 13 Place Pasteur-BP74, Tunis 1002, Tunisia
| | - Naouel Eddaikra
- Laboratory of Eco-Epidemiology Parasitic Population Genetics, Pasteur Institute of Algiers, Algiers 16000, Algeria
| | - Kais Ghedira
- Laboratory of Bioinformatics, BioMathematics and Biostatistics, Institut Pasteur de Tunis, 13 Place Pasteur-BP74, Tunis 1002, Tunisia
| | - Lamia Guizani-Tabbane
- Laboratoire de Parasitologie Médicale, Biotechnologies et Biomolécules (LR16IPT06), Institut Pasteur de Tunis, Université Tunis El-Manar, 13 Place Pasteur-BP74, Tunis 1002, Tunisia
| | - Cyrille Y Botté
- ApicoLipid Team, Institute for Advanced Biosciences, CNRS UMR5309, INSERM-National Institute for Health and Medical Research, Université Grenoble Alpes, INSERM U1209, 38000 Grenoble, France
| | - Imen Rabhi
- Laboratoire de Parasitologie Médicale, Biotechnologies et Biomolécules (LR16IPT06), Institut Pasteur de Tunis, Université Tunis El-Manar, 13 Place Pasteur-BP74, Tunis 1002, Tunisia
- Higher Institute of Biotechnology of Sidi Thabet, University of Manouba, Tunis 2050, Tunisia
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Frankfater C, Fujiwara H, Williams SJ, Minnaard A, Hsu FF. Characterization of Mycobacterium tuberculosis Mycolic Acids by Multiple-Stage Linear Ion-Trap Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2022; 33:149-159. [PMID: 34842433 DOI: 10.1021/jasms.1c00310] [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: 06/13/2023]
Abstract
Mycobacterium tuberculosis (Mtb) cells are known to synthesize very long chain (C60-90) structurally complex mycolic acids with various functional groups. In this study, we applied linear ion-trap (LIT) multiple-stage mass spectrometry (MSn), combined with high-resolution mass spectrometry to study the mechanisms underlying the fragmentation processes of mycolic acid standards desorbed as lithiated adduct ions by ESI. This is followed by structural characterization of a Mtb mycolic acid family (Bovine strain). Using the insight fragmentation processes gained from the study, we are able to achieve a near complete characterization of the whole mycolic acid family, revealing the identity of the α-alkyl chain, the location of the functional groups including methyl, methoxy, and keto groups along the meroaldehyde chain in each lipid species. This study showcased the power of LIT MSn toward structural determination of complex lipids in a mixture, which would be otherwise very difficult to define using other analytical techniques.
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Affiliation(s)
- Cheryl Frankfater
- Mass Spectrometry Resource, Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63110 United States
| | - Hideji Fujiwara
- Mass Spectrometry Resource, Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63110 United States
| | - Spencer J Williams
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Adriaan Minnaard
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 7, 9747 AG Groningen, The Netherlands
| | - Fong-Fu Hsu
- Mass Spectrometry Resource, Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63110 United States
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6
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Moitra S, Basu S, Pawlowic M, Hsu FF, Zhang K. De Novo Synthesis of Phosphatidylcholine Is Essential for the Promastigote But Not Amastigote Stage in Leishmania major. Front Cell Infect Microbiol 2021; 11:647870. [PMID: 33777852 PMCID: PMC7996062 DOI: 10.3389/fcimb.2021.647870] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 02/09/2021] [Indexed: 12/18/2022] Open
Abstract
Phosphatidylcholine (PC) is the most abundant type of phospholipids in eukaryotes constituting ~30% of total lipids in Leishmania. PC synthesis mainly occurs via the choline branch of the Kennedy pathway (choline ⇒ choline-phosphate ⇒ CDP-choline ⇒ PC) and the N-methylation of phosphatidylethanolamine (PE). In addition, Leishmania parasites can acquire PC and other lipids from the host or culture medium. In this study, we assessed the function and essentiality of choline ethanolamine phosphotransferase (CEPT) in Leishmania major which is responsible for the final step of the de novo synthesis of PC and PE. Our data indicate that CEPT is localized in the endoplasmic reticulum and possesses the activity to generate PC from CDP-choline and diacylglycerol. Targeted deletion of CEPT is only possible in the presence of an episomal CEPT gene in the promastigote stage of L. major. These chromosomal null parasites require the episomal expression of CEPT to survive in culture, confirming its essentiality during the promastigote stage. In contrast, during in vivo infection of BALB/c mice, these chromosomal null parasites appeared to lose the episomal copy of CEPT while maintaining normal levels of virulence, replication and cellular PC. Therefore, while the de novo synthesis of PC/PE is indispensable for the proliferation of promastigotes, intracellular amastigotes appear to acquire most of their lipids through salvage and remodeling.
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Affiliation(s)
- Samrat Moitra
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, United States
| | - Somrita Basu
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, United States
| | - Mattie Pawlowic
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, United States
| | - Fong-Fu Hsu
- Mass Spectrometry Resource, Division of Endocrinology, Diabetes, Metabolism, and Lipid research, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, United States
| | - Kai Zhang
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, United States
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7
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Zayed MA, Jin X, Yang C, Belaygorod L, Engel C, Desai K, Harroun N, Saffaf O, Patterson BW, Hsu FF, Semenkovich CF. CEPT1-Mediated Phospholipogenesis Regulates Endothelial Cell Function and Ischemia-Induced Angiogenesis Through PPARα. Diabetes 2021; 70:549-561. [PMID: 33214136 PMCID: PMC7881870 DOI: 10.2337/db20-0635] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 11/12/2020] [Indexed: 11/13/2022]
Abstract
De novo phospholipogenesis, mediated by choline-ethanolamine phosphotransferase 1 (CEPT1), is essential for phospholipid activation of transcription factors such as peroxisome proliferator-activated receptor α (PPARα) in the liver. Fenofibrate, a PPARα agonist and lipid-lowering agent, decreases amputation incidence in patients with diabetes. Because we previously observed that CEPT1 is elevated in carotid plaque of patients with diabetes, we evaluated the role of CEPT1 in peripheral arteries and PPARα phosphorylation (Ser12). CEPT1 was found to be elevated in diseased lower-extremity arterial intima of individuals with peripheral arterial disease and diabetes. To evaluate the role of Cept1 in the endothelium, we engineered a conditional endothelial cell (EC)-specific deletion of Cept1 via induced VE-cadherin-CreERT2-mediated recombination (Cept1Lp/LpCre +). Cept1Lp/LpCre + ECs demonstrated decreased proliferation, migration, and tubule formation, and Cept1Lp/LpCre + mice had reduced perfusion and angiogenesis in ischemic hind limbs. Peripheral ischemic recovery and PPARα signaling were further compromised by streptozotocin-induced diabetes and ameliorated by feeding fenofibrate. Cept1 endoribonuclease-prepared siRNA decreased PPARα phosphorylation in ECs, which was rescued with fenofibrate but not PC16:0/18:1. Unlike Cept1Lp/LpCre + mice, Cept1Lp/LpCre + Ppara -/- mice did not demonstrate hind-paw perfusion recovery after feeding fenofibrate. Therefore, we demonstrate that CEPT1 is essential for EC function and tissue recovery after ischemia and that fenofibrate rescues CEPT1-mediated activation of PPARα.
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Affiliation(s)
- Mohamed A Zayed
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
- VA St. Louis Health Care System, St. Louis, MO
| | - Xiaohua Jin
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Chao Yang
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Larisa Belaygorod
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Connor Engel
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Kshitij Desai
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Nikolai Harroun
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Omar Saffaf
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Bruce W Patterson
- Center for Human Nutrition, Department of Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Fong-Fu Hsu
- Division of Endocrinology, Metabolism and Lipid Research, Department of Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Clay F Semenkovich
- Division of Endocrinology, Metabolism and Lipid Research, Department of Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO
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Abstract
To understand the interplay of lipids between Leishmania promastigotes, amastigotes, and vertebrate host cells, a robust method for cultivating Leishmania parasites, lipid extraction, and shotgun lipidomic analysis with loop injection is described. This book chapter provides the step-by-step workflow to guide readers from sample preparation to the global lipid analysis by multiple stage mass spectrometry with high resolution and tandem quadrupole mass spectrometric approaches toward studying the metabolomic roles that lipids may play in Leishmania parasite infections.
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Affiliation(s)
- Kai Zhang
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, USA
| | - Fong-Fu Hsu
- Mass Spectrometry Resource, Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA.
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9
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Blevins MS, James VK, Herrera CM, Purcell AB, Trent MS, Brodbelt JS. Unsaturation Elements and Other Modifications of Phospholipids in Bacteria: New Insight from Ultraviolet Photodissociation Mass Spectrometry. Anal Chem 2020; 92:9146-9155. [PMID: 32479092 PMCID: PMC7384744 DOI: 10.1021/acs.analchem.0c01449] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Glycerophospholipids (GPLs), one of the main components of bacterial cell membranes, exhibit high levels of structural complexity that are directly correlated with biophysical membrane properties such as permeability and fluidity. This structural complexity arises from the substantial variability in the individual GPL structural components such as the acyl chain length and headgroup type and is further amplified by the presence of modifications such as double bonds and cyclopropane rings. Here we use liquid chromatography coupled to high-resolution and high-mass-accuracy ultraviolet photodissociation mass spectrometry for the most in-depth study of bacterial GPL modifications to date. In doing so, we unravel a diverse array of unexplored GPL modifications, ranging from acyl chain hydroxyl groups to novel headgroup structures. Along with characterizing these modifications, we elucidate general trends in bacterial GPL unsaturation elements and thus aim to decipher some of the biochemical pathways of unsaturation incorporation in bacterial GPLs. Finally, we discover aminoacyl-PGs not only in Gram-positive bacteria but also in Gram-negative C. jejuni, advancing our knowledge of the methods of surface charge modulation that Gram-negative organisms may adopt for antibiotic resistance.
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Affiliation(s)
- Molly S Blevins
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Virginia K James
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Carmen M Herrera
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602, United States
| | - Alexandria B Purcell
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602, United States
| | - M Stephen Trent
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602, United States
- Department of Microbiology, College of Arts and Sciences, University of Georgia, Athens, Georgia 30602, United States
- Center for Vaccines and Immunology, University of Georgia, Athens, Georgia 30602, United States
| | - Jennifer S Brodbelt
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
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Maamoun AA, El-Akkad RH, Farag MA. Mapping metabolome changes in Luffa aegyptiaca Mill fruits at different maturation stages via MS-based metabolomics and chemometrics. J Adv Res 2019; 29:179-189. [PMID: 33842015 PMCID: PMC8020157 DOI: 10.1016/j.jare.2019.10.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2019] [Revised: 10/11/2019] [Accepted: 10/23/2019] [Indexed: 02/06/2023] Open
Abstract
Introduction Luffa aegyptiaca Mill, sponge gourd or Egyptian cucumber, is grown worldwide for its edible fruit consumed as a vegetable like cucumber. Unlike young fruit (YF), the fully mature ripened fruit (MF) is strongly fibrous and is used as a cleanser to make scrubbing bath sponges. YF undergoes a complex series of physiological and biochemical changes during fruit ripening. However, the chemical compositional differences between YF and MF in Luffa aegyptiaca have not been distinguished to date. Objectives Comprehensively compare the metabolites profile of YF and MF to give insight on how maturation stage affects chemical composition. Methods Mass-based metabolomics comprising GC/MS and UHPLC/MS were adopted in this study targeting its volatile and non-volatile metabolites coupled with chemometrics to rationalize for the differences. Results A total of 53 volatile metabolites were identified via headspace solid phase microextraction (SPME) comprising 66.2% aldehydes/furans, 51.6% alcohols, 38.2% ketones, 15.1% acids and 10.1% aromatics of which aldehydes/ furans were dominant at both fruit stages. Young fruit was in general more erniched in metabolites as revealed from UHPLC/MS and GC/MS analyses. The YF group encompassed higher levels of short chain alcohols (1-octen-3-ol) and aldehydes ((E)-2-hexenal and cucumber aldehyde) in addition to terpenoids (linalool). In contrast, fatty acids (octanoic acid) predominated MF specimens. UHPLC/MS analysis revealed for several oleanene triterpene glycosides as major secondary bioactive compounds, dihydroxy-oxo-oleanenoic acid glycoside found more abundant in YF versus MF as revealed from multivariate data analyses. Conclusions Our results reveal for the distinct metabolite changes in L. aegyptiaca fruit in its different stages and to rationalize for its different usage.
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Affiliation(s)
- Amal A Maamoun
- Department of Pharmacognosy, National Research Centre, 33 El Buhouth St., P.O. 12622 (ID:60014618), Cairo, Egypt
| | - Radwa H El-Akkad
- Department of Pharmacognosy, National Research Centre, 33 El Buhouth St., P.O. 12622 (ID:60014618), Cairo, Egypt
| | - Mohamed A Farag
- Pharmacognosy Department, College of Pharmacy, Cairo University, Kasr el Aini St., P.B. 11562, Cairo, Egypt.,Chemistry Department, School of Sciences & Engineering, The American University in Cairo, New Cairo 11835, Egypt
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11
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Zandi A, Gilani A, Abbasvandi F, Katebi P, Tafti SR, Assadi S, Moghtaderi H, Parizi MS, Saghafi M, Khayamian MA, Davari sh Z, Hoseinpour P, Gity M, Sanati H, Abdolahad M. Carbon nanotube based dielectric spectroscopy of tumor secretion; electrochemical lipidomics for cancer diagnosis. Biosens Bioelectron 2019; 142:111566. [DOI: 10.1016/j.bios.2019.111566] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Revised: 07/31/2019] [Accepted: 08/02/2019] [Indexed: 01/08/2023]
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12
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Blevins MS, Klein DR, Brodbelt JS. Localization of Cyclopropane Modifications in Bacterial Lipids via 213 nm Ultraviolet Photodissociation Mass Spectrometry. Anal Chem 2019; 91:6820-6828. [PMID: 31026154 PMCID: PMC6628200 DOI: 10.1021/acs.analchem.9b01038] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Subtle structural features in bacterial lipids such as unsaturation elements can have vast biological implications. Cyclopropane rings have been correlated with tolerance to a number of adverse conditions in bacterial phospholipids. They have also been shown to play a major role in Mycobacterium tuberculosis ( M. tuberculosis or Mtb) pathogenesis as they occur in mycolic acids (MAs) in the mycobacterial cell. Traditional collisional activation methods allow elucidation of basic structural features of lipids but fail to reveal the presence and position of cyclopropane rings. Here, we employ 213 nm ultraviolet photodissociation mass spectrometry (UVPD-MS) for structural characterization of cyclopropane rings in bacterial phospholipids and MAs. Upon UVPD, dual cross-ring C-C cleavages on both sides of the cyclopropane ring are observed for cyclopropyl lipids, resulting in diagnostic pairs of fragment ions spaced 14 Da apart, thus enabling cyclopropane localization. These diagnostic pairs of ions corresponding to dual cross-ring cleavage are observed in both negative and positive ion modes and afford localization of multiple cyclopropane rings within a single lipid. This method was integrated with liquid chromatography (LC) for LC/UVPD-MS analysis of cyclopropyl glycerophospholipids in Escherichia coli ( E. coli) and for analysis of MAs in Mycobacterium bovis ( M. bovis) and M. tuberculosis lipid extracts.
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Affiliation(s)
- Molly S. Blevins
- Department of Chemistry, University of Texas at Austin, Austin, TX 78712, United States
| | - Dustin R. Klein
- Department of Chemistry, University of Texas at Austin, Austin, TX 78712, United States
| | - Jennifer S. Brodbelt
- Department of Chemistry, University of Texas at Austin, Austin, TX 78712, United States
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Hsu FF. Mass spectrometry-based shotgun lipidomics - a critical review from the technical point of view. Anal Bioanal Chem 2018; 410:6387-6409. [PMID: 30094786 PMCID: PMC6195124 DOI: 10.1007/s00216-018-1252-y] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 07/03/2018] [Accepted: 07/06/2018] [Indexed: 11/24/2022]
Abstract
Over the past decade, mass spectrometry (MS)-based "shotgun lipidomics" has emerged as a powerful tool for quantitative and qualitative analysis of the complex lipids in the biological system. The aim of this critical review is to give the interested reader a concise overview of the current state of the technology, focused on lipidomic analysis by mass spectrometry. The pros and cons, and pitfalls associated with each available "shotgun lipidomics" method are discussed; and the new strategies for improving the current methods are described. A list of important papers and reviews that are sufficient rather than comprehensive, covering all the aspects of lipidomics including the workflow, methodology, and fundamentals is also compiled for readers to follow. Graphical abstract ᅟ.
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Affiliation(s)
- Fong-Fu Hsu
- Mass Spectrometry Resource, Division of Endocrinology, Diabetes, Metabolism, and Lipid Research, Department of Internal Medicine, Washington University School of Medicine, 660 S Euclid, St. Louis, MO, 63110, USA.
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14
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Chao Y, Gao S, Wang X, Li N, Zhao H, Wen X, Lou Z, Dong X. Untargeted lipidomics based on UPLC-QTOF-MS/MS and structural characterization reveals dramatic compositional changes in serum and renal lipids in mice with glyoxylate-induced nephrolithiasis. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1095:258-266. [DOI: 10.1016/j.jchromb.2018.08.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 07/28/2018] [Accepted: 08/06/2018] [Indexed: 12/17/2022]
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15
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Zayed MA, Hsu FF, Patterson BW, Yan Y, Naim U, Darwesh M, De Silva G, Yang C, Semenkovich CF. Diabetes adversely affects phospholipid profiles in human carotid artery endarterectomy plaques. J Lipid Res 2018; 59:730-738. [PMID: 29478028 PMCID: PMC5880490 DOI: 10.1194/jlr.m081026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 02/21/2018] [Indexed: 12/22/2022] Open
Abstract
Patients with diabetes are at higher risk of developing carotid artery stenosis and resultant stroke. Arachidonoyl phospholipids affect plaque inflammation and vulnerability, but whether diabetic patients have unique carotid artery phospholipidomic profiles is unknown. We performed a comprehensive paired analysis of phospholipids in extracranial carotid endarterectomy (CEA) plaques of matched diabetic and nondiabetic patients and analyzed mass spectrometry-derived profiles of three phospholipids, plasmenyl-phosphatidylethanolamine (pPE), phosphatidylserine (PS), and phosphatidylinositol (PI), in maximally (MAX) and minimally (MIN) diseased CEA segments. We also measured levels of arachidonic acid (AA), produced by pPE hydrolysis, and choline-ethanolamine phosphotransferase 1 (CEPT1), responsible for most pPE de novo biosynthesis. In paired analysis, MIN CEA segments had higher levels than MAX segments of pPE (P < 0.001), PS (P < 0.001), and PI (P < 0.03). MIN diabetic plaques contained higher levels than MAX diabetic plaques of arachidonoyl pPE38:4 and pPE38:5 and CEPT1 was upregulated in diabetic versus nondiabetic plaques. AA levels were relatively greater in MIN versus MAX segments of all CEA segments, and were higher in diabetic than nondiabetic plaques. Our findings suggest that arachidonoyl phospholipids are more likely to be abundant in the extracranial carotid artery plaque of diabetic rather than nondiabetic patients.
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Affiliation(s)
- Mohamed A Zayed
- Section of Vascular Surgery, Department of Surgery, Center for Human Nutrition Washington University School of Medicine, St. Louis, MO; Department of Surgery, Veterans Affairs St. Louis Health Care System, St. Louis, MO.
| | - Fong-Fu Hsu
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University, St. Louis, MO
| | - Bruce W Patterson
- Department of Medicine, and Division of Public Health Sciences, Washington University School of Medicine, St. Louis, MO
| | - Yan Yan
- Department of Surgery, Washington University School of Medicine, St. Louis, MO
| | - Uzma Naim
- Section of Vascular Surgery, Department of Surgery, Center for Human Nutrition Washington University School of Medicine, St. Louis, MO
| | - Malik Darwesh
- Section of Vascular Surgery, Department of Surgery, Center for Human Nutrition Washington University School of Medicine, St. Louis, MO
| | - Gayan De Silva
- Section of Vascular Surgery, Department of Surgery, Center for Human Nutrition Washington University School of Medicine, St. Louis, MO
| | - Chao Yang
- Section of Vascular Surgery, Department of Surgery, Center for Human Nutrition Washington University School of Medicine, St. Louis, MO
| | - Clay F Semenkovich
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University, St. Louis, MO
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16
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Xu W, Mukherjee S, Ning Y, Hsu FF, Zhang K. Cyclopropane fatty acid synthesis affects cell shape and acid resistance in Leishmania mexicana. Int J Parasitol 2017; 48:245-256. [PMID: 29180119 DOI: 10.1016/j.ijpara.2017.09.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 09/15/2017] [Indexed: 10/18/2022]
Abstract
Cyclopropane fatty acid synthase (CFAS) catalyzes the transfer of a methylene group from S-adenosyl methionine to an unsaturated fatty acid, generating a cyclopropane fatty acid (CFA). The gene encoding CFAS is present in many bacteria and several Leishmania spp. including Leishmania mexicana, Leishmania infantum and Leishmania braziliensis. In this study, we characterised the CFAS-null and -overexpression mutants in L. mexicana, the causative agent for cutaneous leishmaniasis in Mexico and central America. Our data indicate that L. mexicana CFAS modifies the fatty acid chain of plasmenylethanolamine (PME), the dominant class of ethanolamine glycerophospholipids in Leishmania, generating CFA-PME. While the endogenous level of CFA-PME is extremely low in wild type L. mexicana, overexpression of CFAS results in a significant increase. CFAS-null mutants (cfas-) exhibit altered cell shape, increased sensitivity to acidic pH, and aberrant growth in serum-free media. In addition, the CFAS protein is preferentially expressed during the proliferative stage of L. mexicana and is required for the cell membrane targeting of lipophosphoglycan. Finally, the maturation and localization of CFAS protein are dependent upon the downstream sequence of the CFAS coding region. Without the downstream sequence, the mis-localised CFAS protein cannot fully rescue the defects of cfas-. Our data suggest that CFA modification of phospholipids can significantly affect the parasite's response to certain adverse conditions. These findings are distinct from the roles of CFAS in L. infantum, highlighting the functional divergence in lipid modification among Leishmania spp.
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Affiliation(s)
- Wei Xu
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Sumit Mukherjee
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Yu Ning
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Fong-Fu Hsu
- Mass Spectrometry Resource, Division of Endocrinology, Diabetes, Metabolism, and Lipid research, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Kai Zhang
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA.
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17
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Vu N, Brown J, Giles K, Zhang Q. Ozone-induced dissociation on a traveling wave high-resolution mass spectrometer for determination of double-bond position in lipids. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2017; 31:1415-1423. [PMID: 28590551 PMCID: PMC5560992 DOI: 10.1002/rcm.7920] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 05/31/2017] [Accepted: 06/03/2017] [Indexed: 05/09/2023]
Abstract
RATIONALE The position of C=C within fatty acyl chains affects the biological function of lipids. Ozone-induced dissociation mass spectrometry (OzID-MS) has great potential in determination of lipid double-bond position, but has generally been implemented on low-resolution ion trap mass spectrometers. In addition, most of the OzID-MS experiments carried out so far were focused on the sodiated adducts of lipids; fragmentation of the most commonly observed protonated ions generated in LC/MS-based lipidomics workflow has been less explored. METHODS Ozone generated in line from an ozone generator was connected to the trap and transfer gas supply line of a Synapt G2 high-resolution mass spectrometer. Protonated ions of different phosphatidylcholines (PC) were generated by electrospray ionization through direct infusion. Different parameters, including traveling wave height and velocity, trap entrance and DC potential, were adjusted to maximize the OzID efficiency. sn-positional isomers and cis/trans isomers of lipids were compared for their reactivity with ozone. RESULTS Traveling wave height and velocity were tuned to prolong the encounter time between lipid ions and ozone, and resulted in improved OzID efficiency, as did increasing trapping region DC and entrance potential. Under optimized settings, at least 1000 times enhancement in OzID efficiency was achieved compared to that under default settings for monounsaturated PC standards. Monounsaturated C=C in the sn-2 PC isomer reacted faster with ozone than the sn-1 isomer. Similarly, the C=C in trans PC reacted faster than in cis PC. CONCLUSIONS This is the first implementation of OzID in the trap and transfer region of a traveling wave enabled high-resolution mass spectrometer. The OzID reaction efficiency is significantly improved by slowing down ions in the trap region for their prolonged interaction with ozone. This will facilitate application of high-resolution OzID-MS in lipidomics.
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Affiliation(s)
- Ngoc Vu
- Department of Chemistry & Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27412, USA
| | | | | | - Qibin Zhang
- Department of Chemistry & Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27412, USA
- Center for Translational Biomedical Research, University of North Carolina at Greensboro, North Carolina Research Campus, Kannapolis, NC 28081, USA
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Biagiotti M, Dominguez S, Yamout N, Zufferey R. Lipidomics and anti-trypanosomatid chemotherapy. Clin Transl Med 2017; 6:27. [PMID: 28766182 PMCID: PMC5539062 DOI: 10.1186/s40169-017-0160-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 07/26/2017] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Trypanosomatids such as Leishmania, Trypanosoma brucei and Trypanosoma cruzi belong to the order Kinetoplastida and are the source of many significant human and animal diseases. Current treatment is unsatisfactory and is compromised by the rising appearance of drug resistant parasites. Novel and more effective chemotherapeutics are urgently needed to treat and prevent these devastating diseases, which relies on the identification of essential, parasite specific targets that are absent in the host. Lipids constitute essential components of the cell and carry out multiple critical functions from building blocks of biological membranes to regulatory roles in signal transduction, organellar biogenesis, energy storage, and virulence. The recent technological advances of lipidomics has facilitated the broadening of our knowledge in the field of cellular lipid content, structure, functions, and metabolic pathways. MAIN BODY This review highlights the application of lipidomics (i) in the characterization of the lipidome of kinetoplastid parasites or of their subcellular structure(s), (ii) in the identification of unique lipid species or metabolic pathways that can be targeted for novel drug therapies, (iii) as an analytic tool to gain a deeper insight into the roles of specific enzymes in lipid metabolism using genetically modified microorganisms, and (iv) in deciphering the mechanism of action of anti-microbial drugs on lipid metabolism. Lastly, an outlook stating where the field is evolving is presented. CONCLUSION Lipidomics has contributed to the expanding knowledge related to lipid metabolism, mechanism of drug action and resistance, and pathogen-host interaction of trypanosomatids, which provides a solid basis for the development of better anti-parasitic pharmaceuticals.
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Affiliation(s)
| | | | - Nader Yamout
- St John's University, 8000 Utopia Parkway, Queens, NY, 11439, USA
| | - Rachel Zufferey
- St John's University, 8000 Utopia Parkway, Queens, NY, 11439, USA.
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Fernandez-Prada C, Vincent IM, Brotherton MC, Roberts M, Roy G, Rivas L, Leprohon P, Smith TK, Ouellette M. Different Mutations in a P-type ATPase Transporter in Leishmania Parasites are Associated with Cross-resistance to Two Leading Drugs by Distinct Mechanisms. PLoS Negl Trop Dis 2016; 10:e0005171. [PMID: 27911896 PMCID: PMC5135041 DOI: 10.1371/journal.pntd.0005171] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 11/08/2016] [Indexed: 12/30/2022] Open
Abstract
Leishmania infantum is an etiological agent of the life-threatening visceral form of leishmaniasis. Liposomal amphotericin B (AmB) followed by a short administration of miltefosine (MF) is a drug combination effective for treating visceral leishmaniasis in endemic regions of India. Resistance to MF can be due to point mutations in the miltefosine transporter (MT). Here we show that mutations in MT are also observed in Leishmania AmB-resistant mutants. The MF-induced MT mutations, but not the AmB induced mutations in MT, alter the translocation/uptake of MF. Moreover, mutations in the MT selected by AmB or MF have a major impact on lipid species that is linked to cross-resistance between both drugs. These alterations include changes of specific phospholipids, some of which are enriched with cyclopropanated fatty acids, as well as an increase in inositolphosphoceramide species. Collectively these results provide evidence of the risk of cross-resistance emergence derived from current AmB-MF sequential or co-treatments for visceral leishmaniasis.
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Affiliation(s)
- Christopher Fernandez-Prada
- Centre de Recherche en Infectiologie du Centre de Recherche du CHU de Québec and Département de Microbiologie, Infectiologie et Immunologie, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Isabel M. Vincent
- Centre de Recherche en Infectiologie du Centre de Recherche du CHU de Québec and Département de Microbiologie, Infectiologie et Immunologie, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Marie-Christine Brotherton
- Centre de Recherche en Infectiologie du Centre de Recherche du CHU de Québec and Département de Microbiologie, Infectiologie et Immunologie, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Mathew Roberts
- Biomedical Sciences Research Complex (BSRC), Schools of Biology & Chemistry, The North Haugh, The University of St. Andrews, United Kingdom
| | - Gaétan Roy
- Centre de Recherche en Infectiologie du Centre de Recherche du CHU de Québec and Département de Microbiologie, Infectiologie et Immunologie, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Luis Rivas
- Centro de Investigaciones Biológicas (CSIC), Madrid, Spain
| | - Philippe Leprohon
- Centre de Recherche en Infectiologie du Centre de Recherche du CHU de Québec and Département de Microbiologie, Infectiologie et Immunologie, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Terry K. Smith
- Biomedical Sciences Research Complex (BSRC), Schools of Biology & Chemistry, The North Haugh, The University of St. Andrews, United Kingdom
| | - Marc Ouellette
- Centre de Recherche en Infectiologie du Centre de Recherche du CHU de Québec and Département de Microbiologie, Infectiologie et Immunologie, Faculté de Médecine, Université Laval, Québec, Québec, Canada
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Pawlowic M, Hsu FF, Moitra S, Biyani N, Zhang K. Plasmenylethanolamine synthesis in Leishmania major. Mol Microbiol 2016; 101:238-49. [PMID: 27062077 PMCID: PMC4935589 DOI: 10.1111/mmi.13387] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/28/2016] [Indexed: 02/06/2023]
Abstract
Ethanolamine glycerophospholipids are ubiquitous cell membrane components. Trypanosomatid parasites of the genus Leishmania synthesize the majority of their ethanolamine glycerophospholipids as 1-O-alk-1'-enyl-2-acyl-sn-glycero-3-phosphoethanolamine or plasmenylethanolamine (PME) through the Kennedy pathway. PME is a subtype of ether phospholipids also known as ethanolamine plasmalogen whose functions are not well characterized. In this study, we investigated the role of PME synthesis in Leishmania major through the characterization of an ethanolamine phosphotransferase (EPT) mutant. EPT-null parasites are largely devoid of PME and fully viable in regular medium but fail to proliferate in the absence of fetal bovine serum. They exhibit significant abnormalities in the synthesis and localization of GPI-anchored surface molecules. EPT-null mutants also show attenuated virulence in BALB/c mice. Furthermore, in addition to PME synthesis, ethanolamine also contributes to the production of phosphatidylcholine, the most abundant class of lipids in Leishmania. Together, these findings suggest that ethanolamine production is likely required for Leishmania promastigotes to generate bulk phospholipids, to handle stress, and to control the expression of membrane bound virulence factors.
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Affiliation(s)
- Mattie Pawlowic
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Fong-fu Hsu
- Department of Internal Medicine, Washington University School of Medicine, 660 S. Euclid Ave., Saint Louis, MO 63110, USA
| | - Samrat Moitra
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Neha Biyani
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Kai Zhang
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
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Deng P, Zhong D, Wang X, Dai Y, Zhou L, Leng Y, Chen X. Analysis of diacylglycerols by ultra performance liquid chromatography-quadrupole time-of-flight mass spectrometry: Double bond location and isomers separation. Anal Chim Acta 2016; 925:23-33. [PMID: 27188314 DOI: 10.1016/j.aca.2016.04.051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 04/18/2016] [Accepted: 04/22/2016] [Indexed: 02/02/2023]
Abstract
Diacylglycerols (DAGs) are important lipid intermediates and have been implicated in human diseases. Isomerism complicates their mass spectrometric analysis; in particular, it is difficult to identify fatty acid substituents and locate the double bond positions in unsaturated DAGs. We have developed an analytical strategy using ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC/Q-TOF MS) in conjunction with dimethyl disulfide (DMDS) derivatization and collision cross-section (CCS) measurement to characterize DAGs in biological samples. The method employs non-aqueous reversed-phase chromatographic separation and profile collision energy (CE) mode for MS(E) and MS/MS analyses. Three types of fragment ions were produced simultaneously. Hydrocarbon ions (m/z 50-200) obtained at high CE helped to distinguish unsaturated and saturated DAGs rapidly. Neutral loss ions and acylium ions (m/z 300-400) produced at low CE were used to identify fatty acid substituents. Informative methyl thioalkane fragment ions were used to locate the double bonds of unsaturated DAGs. Mono-methylthio derivatives were formed mainly by the reaction of DAGs with DMDS, where methyl thiol underwent addition to the first double bond farthest from the ester terminus of unsaturated fatty acid chains. The addition of CCS values maximized the separation of isomeric DAG species and improved the confidence of DAG identification. Fourteen DAGs were identified in mouse myotube cells based on accurate masses, characteristic fragment ions, DMDS derivatization, and CCS values.
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Affiliation(s)
- Pan Deng
- Centre for Drug Metabolism and Pharmacokinetics Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Shanghai 201210, China
| | - Dafang Zhong
- Centre for Drug Metabolism and Pharmacokinetics Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Shanghai 201210, China; State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Xi Wang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Yulu Dai
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Lei Zhou
- Centre for Drug Metabolism and Pharmacokinetics Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Shanghai 201210, China
| | - Ying Leng
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Xiaoyan Chen
- Centre for Drug Metabolism and Pharmacokinetics Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Shanghai 201210, China.
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