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Tarannum N, Kumar D, Agrawal R. Facile Titrimetric Assay of Lysophosphatidic Acid in Human Serum and Plasma for Ovarian Cancer Detection. J Cancer Prev 2023; 28:31-39. [PMID: 37434795 PMCID: PMC10331031 DOI: 10.15430/jcp.2023.28.2.31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 06/06/2023] [Accepted: 06/07/2023] [Indexed: 07/13/2023] Open
Abstract
Herein, an instrument free facile acid-base titrimetric methodology is reported for lysophosphatidic acid (LPA) measurement in serum and plasma samples for ovarian cancer detection. The concept is based on the titrimetric method in which alkaline solution was titrated with free fatty acid. Free fatty acid is generated due to action of the lysophospholipase to LPA. A phospholipid derivative known as LPA can function as a signaling molecule. A glycerol backbone serves as the foundation for phosphatidic acid, which also has bonds to an unsaturated fatty acid at carbon-1, a hydroxyl group at carbon-2, and a phosphate molecule at carbon-3. Free fatty acid and glycerol-3-phosphate are formed when LPA reacts with lysophospholipase. The formation of free fatty acid depends on the concentration of LPA. The standard graph of known concentrations of LPA, LPA spiked serum and LPA spiked plasma was plotted. The concentration of LPA in unknown serum and plasma were calculated from the standard graph. The limit of detection of LPA in spiked serum and plasma samples via titrimetric assay was calculated as 0.156 μmol/L. A patient's chance of survival may be outweighed by an early diagnosis of ovarian cancer.
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Affiliation(s)
- Nazia Tarannum
- Department of Chemistry, Chaudhary Charan Singh University, Meerut, India
| | - Deepak Kumar
- Department of Chemistry, Chaudhary Charan Singh University, Meerut, India
| | - Ranu Agrawal
- Department of Applied Science, Sir Chhotu Ram Institute of Engineering and Technology, Chaudhary Charan Singh University, Meerut, India
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Sousa BC, Klein ZG, Taylor D, West G, Huipeng AN, Wakelam MJO, Lopez-Clavijo AF. Comprehensive lipidome of human plasma using minimal sample manipulation by liquid chromatography coupled with mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2023:e9472. [PMID: 36652341 DOI: 10.1002/rcm.9472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 06/17/2023]
Abstract
RATIONALE The present work shows comprehensive chromatographic methods and MS conditions that have been developed based on the chemical properties of each lipid subclass to detect low-abundance molecular species. This study shows that the developed methods can detect low- and/or very-low-abundant lipids like phosphatidic acid (PA) in the glycerophospholipid (GP) method; dihydroceramide (dhCer) and dihydrosphingosine/sphinganine (dhSPB) in the sphingolipid (SP) method; and lysophosphatidic acid (LPA), LPI, LPG and sphingosine-1-phosphate (SPBP) in the lysolipid method. METHODS An optimised method for the extraction of lysolipids in plasma is used in addition to Folch extraction. Then, four chromatographic methods coupled with mass spectrometry using targeted and untargeted approaches are described here. Three of the methods use a tertiary pumping system to enable the inclusion of a gradient for analyte separation (pumps A and B) and an isocratic wash (pump C). This wash solution elutes interfering compounds that could cause background signal in the subsequent injections, reducing column lifetime. RESULTS Semi-quantitative values for 37 lipid subclasses are reported for a plasma sample (NIST SRM 1950). Furthermore, the methods presented here enabled the identification of 338 different lipid molecular species for GPs (mono- and diacyl-phospholipds), SPs, sterols and glycerolipids. The methods have been validated, and the reproducibility is presented here. CONCLUSIONS The comprehensive analysis of the lipidome addressed here of glycerolipids, GPs, sterols and SPs is in good agreement with previously reported results, in the NIST SRM 1950 sample, by other laboratories. Ten lipid subclasses LPS, LPI, alkyl-lysophosphatidic acid/alkenyl-lysophosphatidic acid, alkyl-lysophosphatidylethanolamine/alkenyl-lysophosphatidylethanolamine, dhCer (d18:0), SPB (d18:1), dhSPB (d18:0) and SPBP (d18:2) have been detected using this comprehensive method and are uniquely reported here.
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Affiliation(s)
- Bebiana C Sousa
- Lipidomics Facility, Babraham Institute, Babraham Research Campus, Cambridge, UK
| | - Zulema Gonzalez Klein
- Lipidomics Facility, Babraham Institute, Babraham Research Campus, Cambridge, UK
- Centro de Biotecnología y Genómica de Plantas (CBGP), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Universidad Politécnica de Madrid (UPM), Madrid, Spain
- Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid (UPM), Madrid, Spain
| | - Diane Taylor
- Lipidomics Facility, Babraham Institute, Babraham Research Campus, Cambridge, UK
| | - Greg West
- Lipidomics Facility, Babraham Institute, Babraham Research Campus, Cambridge, UK
| | - Aveline Neo Huipeng
- Lipidomics Facility, Babraham Institute, Babraham Research Campus, Cambridge, UK
| | - Michael J O Wakelam
- Lipidomics Facility, Babraham Institute, Babraham Research Campus, Cambridge, UK
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Development and validation of a simple and rapid HILIC-MS/MS method for the quantification of low-abundant lysoglycerophospholipids in human plasma. Anal Bioanal Chem 2023; 415:411-425. [PMID: 36370204 DOI: 10.1007/s00216-022-04421-9] [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: 08/02/2022] [Revised: 10/31/2022] [Accepted: 11/02/2022] [Indexed: 11/15/2022]
Abstract
Lysoglycerophospholipids (Lyso-GPLs) are an essential class of signaling lipids with potential roles in human diseases, such as cancer, central nervous system diseases, and atherosclerosis. Current methods for the quantification of Lyso-GPLs involve complex sample pretreatment, long analysis times, and insufficient validation, which hinder the research of Lyso-GPLs in human studies, especially for Lyso-GPLs with low abundance in human plasma such as lysophosphatidic acid (LPA), lysophosphatidylinositol (LPI), lysophosphatidylglycerol (LPG), lysophosphatidylserine (LysoPS), lyso-platelet-activating factor (LysoPAF), and cyclic phosphatidic acid (cPA). Herein, we report the development and validation of a simple and rapid liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the quantification of Lyso-GPLs with low abundance in plasma. Protein precipitation using MeOH for Lyso-GPL extraction, quick separation (within 18 min) based on hydrophilic interaction liquid chromatography (HILIC), and sensitive MS detection under dynamic multiple reaction monitoring (dMRM) mode enabled efficient quantification of 22 Lyso-GPLs including 2 cPA, 4 LPG, 11 LPA, 2 LysoPS, and 3 LysoPAF in 50 μL of human plasma. The present method showed good linearity (goodness of fit, 0.99823-0.99995), sensitivity (lower limit of quantification, 0.03-14.06 ng/mL), accuracy (73-117%), precision (coefficient of variation ≤ 28%), carryover (≤ 17%), recovery (80-110%), and stability (83-123%). We applied the method in an epidemiological study and report concentrations of 18 Lyso-GPLs in 567 human plasma samples comparable to those of previous studies. Significant negative associations of LysoPAF C18, LysoPAF C18:1, and LysoPAF C16 with homeostatic model assessment for insulin resistance (HOMA-IR) level were observed; this indicates possible roles of LysoPAF in glucose homeostasis. The application of the present method will improve understanding of the roles of circulating low-abundant Lyso-GPLs in health and diseases.
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Huang X, Feng B, Liu M, Liu Z, Li S, Zeng W. Preclinical detection of lysophosphatidic acid: A new window for ovarian cancer diagnostics. Talanta 2022; 247:123561. [DOI: 10.1016/j.talanta.2022.123561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 04/29/2022] [Accepted: 05/14/2022] [Indexed: 12/17/2022]
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Hu C, Luo W, Xu J, Han X. RECOGNITION AND AVOIDANCE OF ION SOURCE-GENERATED ARTIFACTS IN LIPIDOMICS ANALYSIS. MASS SPECTROMETRY REVIEWS 2022; 41:15-31. [PMID: 32997818 PMCID: PMC8287896 DOI: 10.1002/mas.21659] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 08/24/2020] [Accepted: 08/31/2020] [Indexed: 05/04/2023]
Abstract
Lipid research is attracting more and more attention as various key roles and novel biological functions of lipids have been demonstrated and discovered in the organism. Mass spectrometry (MS)-based lipidomics approaches are the most powerful and effective tools for analysis of cellular lipidomes with very high sensitivity and specificity. However, the artifacts generated from in-source fragmentation are always present in all kinds of ion sources, even soft ionization techniques (i.e., electrospray ionization and matrix-assisted laser desorption/ionization [MALDI]). These artifacts can cause many problems for lipidomics, especially when the fragment ions correspond to/are isomeric species of other endogenous lipid species in complex biological samples. These commonly observed artifacts could lead to misannotation, false identification, and consequently, incorrect attribution of phenotypes, and will have negative impact on any MS-based lipidomics research including but not limited to biomarker discovery, drug development, etc. Liquid chromatography-MS, shotgun lipidomics, and MALDI-MS imaging are three representative lipidomics approaches in which ion source-generated artifacts are all manifested and are comprehensively summarized in this article. The strategies on how to avoid/reduce the artifacts of in-source fragmentation on lipidomics analysis are also discussed in detail. We believe that with the recognition and avoidance of ion source-generated artifacts, MS-based lipidomics approaches will provide better accuracy on comprehensive analysis of biological samples and will make greater contribution to the research on metabolism and translational/precision medicine (collectively termed functional lipidomics). © 2020 John Wiley & Sons Ltd. Mass Spec Rev.
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Affiliation(s)
- Changfeng Hu
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, 548 Bingwen Road, Hangzhou, Zhejiang 310053, China
| | - Wenqing Luo
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, 548 Bingwen Road, Hangzhou, Zhejiang 310053, China
| | - Jie Xu
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003 China
| | - Xianlin Han
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229 USA
- Department of Medicine – Diabetes, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229 USA
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Li Q, Wong WR, Chakrabarti A, Birnberg A, Yang X, Verschueren E, Neighbors M, Rosenberger C, Grimbaldeston M, Tew GW, Sandoval W. Serum Lysophosphatidic Acid Measurement by Liquid Chromatography-Mass Spectrometry in COPD Patients. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:1987-1997. [PMID: 33754705 DOI: 10.1021/jasms.0c00429] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Lysophospholipids are bioactive signaling molecules derived from cell membrane glycerophospholipids or sphingolipids and are highly regulated under normal physiological conditions. Lysophosphatidic acids (LPAs) are a class of lysophospholipids that act on G-protein-coupled receptors to exert a variety of cellular functions. Dysregulation of phospholipase activity and consequently LPA synthesis in serum have been linked to inflammation, such as seen in chronic obstructive pulmonary disease (COPD). The accurate measurement of phospholipids is critical for evaluating their dysregulation in disease. In this study, we optimized experimental parameters for the sensitive measurement of LPAs. We validated the method based on matrix, linearity, accuracy, precision, and stability. An investigation into sample extraction processes emphasized that the common practice of including low concentration of hydrochloric acid in the extraction buffer causes an overestimation of lipid recovery. The liquid chromatography gradient was optimized to separate various lysophospholipid classes. After optimization, detection limits of LPA were sufficiently sensitive for subsequent analysis, ranging from 2 to 8 nM. The validated workflow was applied to a cohort of healthy donor and COPD patient sera. Eight LPA species were identified, and five unique species of LPA were quantified. Most LPA species increased significantly in COPD patients compared to healthy donors. The correlation between LPAs and other demographic parameters was further investigated in a sample set of over 200 baseline patient sera from a COPD clinical trial. For the first time, LPAs other than the two most abundant and readily detectable moieties are quantified in COPD patients using validated methods, opening the door to downstream biomarker evaluation in respiratory disease.
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LI NS, CHEN L, XIAO ZX, YANG YQ, AI KL. Progress in Detection of Biomarker of Ovarian Cancer: Lysophosphatidic Acid. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2020. [DOI: 10.1016/s1872-2040(20)60062-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Kim SJ, Howe C, Mitchell J, Choo J, Powers A, Oikonomopoulos A, Pothoulakis C, Hommes DW, Im E, Rhee SH. Autotaxin loss accelerates intestinal inflammation by suppressing TLR4-mediated immune responses. EMBO Rep 2020; 21:e49332. [PMID: 32875703 DOI: 10.15252/embr.201949332] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 07/20/2020] [Accepted: 08/10/2020] [Indexed: 12/13/2022] Open
Abstract
Autotaxin (ATX) converts lysophosphatidylcholine and sphingosyl-phosphorylcholine into lysophosphatidic acid and sphingosine 1-phosphate, respectively. Despite the pivotal function of ATX in lipid metabolism, mechanisms by which ATX regulates immune and inflammatory disorders remain elusive. Here, using myeloid cell lineage-restricted Atx knockout mice, we show that Atx deficiency disrupts membrane microdomains and lipid rafts, resulting in the inhibition of Toll-like receptor 4 (TLR4) complex formation and the suppression of adaptor recruitment, thereby inhibiting TLR4-mediated responses in macrophages. Accordingly, TLR4-induced innate immune functions, including phagocytosis and iNOS expression, are attenuated in Atx-deficient macrophages. Consequently, Atx-/- mice exhibit a higher bacterial prevalence in the intestinal mucosa compared to controls. When combined with global Il10-/- mice, which show spontaneous colitis due to the translocation of luminal commensal microbes into the mucosa, myeloid cell lineage-restricted Atx knockout accelerates colitis development compared to control littermates. Collectively, our data reveal that Atx deficiency compromises innate immune responses, thereby promoting microbe-associated gut inflammation.
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Affiliation(s)
- Su Jin Kim
- Department of Biological Sciences, Oakland University, Rochester, MI, USA.,College of Pharmacy, Pusan National University, Busan, Korea
| | - Cody Howe
- Department of Biological Sciences, Oakland University, Rochester, MI, USA
| | - Jonathon Mitchell
- Department of Biological Sciences, Oakland University, Rochester, MI, USA
| | - Jieun Choo
- College of Pharmacy, Pusan National University, Busan, Korea
| | - Alexandra Powers
- Department of Biological Sciences, Oakland University, Rochester, MI, USA
| | - Angelos Oikonomopoulos
- Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Charalabos Pothoulakis
- Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Daniel W Hommes
- Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Eunok Im
- College of Pharmacy, Pusan National University, Busan, Korea
| | - Sang Hoon Rhee
- Department of Biological Sciences, Oakland University, Rochester, MI, USA
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Li T, Peng R, Wang F, Hua L, Liu S, Han Z, Pei J, Pei S, Zhao Z, Jiang X, Chen X. Lysophosphatidic acid promotes thrombus stability by inducing rapid formation of neutrophil extracellular traps: A new mechanism of thrombosis. J Thromb Haemost 2020; 18:1952-1964. [PMID: 32291893 DOI: 10.1111/jth.14839] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 03/29/2020] [Accepted: 04/08/2020] [Indexed: 12/24/2022]
Abstract
BACKGROUND Lysophosphatidic acid (LPA), a bioactive phospholipid released by activated platelets, can induce platelet shape changes and aggregation, which may play an important role in thrombosis. In contrast, the interaction of LPA with neutrophils in thrombosis has not been studied. Recently, neutrophil extracellular traps (NETs) have been shown to bind plasma proteins and activate platelets, which promotes thrombosis. OBJECTIVES To investigate whether LPA could activate neutrophils to release NETs, predisposing to thrombosis and promoting thrombus stability. METHODS Levels of neutrophils, NETs, and LPA were detected in 56 participants. Immunofluorescence of NETs and autotaxin, the LPA-producing ectoenzyme, were performed. Induction of NETs and signaling pathways were explored in vitro. RESULTS Patients with acute pulmonary embolism showed elevated levels of neutrophils, NETs (dsDNA, MPO-DNA, citrullinated histone H3, and nucleosomes), LPA18:1, and LPA20:4. NETs were present in human intrapulmonary thrombi and were surrounded by autotaxin. LPA18:1 induced rapid release of NETs from human neutrophils via a peptidylarginine deiminase 4-dependent pathway. LPA-induced NETs provided a scaffolding for plasma protein binding and generated a tissue plasminogen activator (tPA)-resistant blood clot. Addition of deoxyribonuclease I to tPA significantly accelerated the lysis of clots and human intrapulmonary thrombi. Furthermore, LPA-induced NETs could activate platelets to release LPA. CONCLUSION This is the first study to implicate LPA in regulating the stability of thrombi by inducing rapid release of NETs in vitro and ex vivo, which could be a new mechanism of thrombosis. These findings provide new insight into the prevention and therapy of venous thromboembolic disease by targeting the LPA-NET signaling pathway.
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Affiliation(s)
- Tiewei Li
- Diagnostic Laboratory Service, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
| | - Rui Peng
- Diagnostic Laboratory Service, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
| | - Fang Wang
- Diagnostic Laboratory Service, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
| | - Lu Hua
- Key Laboratory of Pulmonary Vascular Medicine & Fuwai Hospital, State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
| | - Sheng Liu
- Department of Cardiac Surgery, Adult Cardiac Surgery Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
| | - Zhiyan Han
- Department of Anesthesiology, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
| | - Jianqiu Pei
- Diagnostic Laboratory Service, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
| | - Shengqiang Pei
- Diagnostic Laboratory Service, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
| | - Zhenwen Zhao
- Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
| | - Xin Jiang
- Department of Cardiology, Key Laboratory of Pulmonary Vascular Medicine, Peking Union Medical College Hospital, Chinese Academy Medical Sciences, Beijing, China
| | - Xi Chen
- Diagnostic Laboratory Service, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
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Hu C, Duan Q, Han X. Strategies to Improve/Eliminate the Limitations in Shotgun Lipidomics. Proteomics 2020; 20:e1900070. [PMID: 31291508 PMCID: PMC7394605 DOI: 10.1002/pmic.201900070] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 06/15/2019] [Indexed: 11/05/2022]
Abstract
Direct infusion-based shotgun lipidomics is one of the most powerful and useful tools in comprehensive analysis of lipid species from lipid extracts of various biological samples with high accuracy/precision. However, despite many advantages, the classical shotgun lipidomics suffers some general dogmas of limitations, such as ion suppression, ambiguous identification of isobaric/isomeric lipid species, and ion source-generated artifacts, restraining the applications in analysis of low-abundance lipid species, particularly those less ionizable or isomers that yield almost identical fragmentation patterns. This article reviews the strategies (such as modifier addition, prefractionation, chemical derivatization, charge feature utilization) that have been employed to improve/eliminate these limitations in modern shotgun lipidomics approaches (e.g., high mass resolution mass spectrometry-based and multidimensional mass spectrometry-based shotgun lipidomics). Therefore, with the enhancement of these strategies for shotgun lipidomics, comprehensive analysis of lipid species including isomeric/isobaric species is achieved in a more accurate and effective manner, greatly substantiating the aberrant lipid metabolism, signaling trafficking, and homeostasis under pathological conditions.
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Affiliation(s)
- Changfeng Hu
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, 548 Bingwen Road, Hangzhou, Zhejiang 310053, China
| | - Qiao Duan
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, 548 Bingwen Road, Hangzhou, Zhejiang 310053, China
| | - Xianlin Han
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229 USA
- Department of Medicine – Diabetes, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229 USA
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De La Franier B, Thompson M. Detection of the Ovarian Cancer Biomarker Lysophosphatidic Acid in Serum. BIOSENSORS-BASEL 2020; 10:bios10020013. [PMID: 32075013 PMCID: PMC7168251 DOI: 10.3390/bios10020013] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 02/06/2020] [Accepted: 02/11/2020] [Indexed: 02/07/2023]
Abstract
Lysophosphatidic acid (LPA) is present during the medical condition of ovarian cancer at all stages of the disease, and, therefore possesses considerable potential as a biomarker for screening its presence in female patients. Unfortunately, there is currently no clinically employable assay for this biomarker. In the present work, we introduce a test based on the duel protein system of actin and gelsolin that could allow the quantitative measurement of LPA in serum samples in a biosensing format. In order to evaluate this possibility, actin protein was dye-modified and complexed with gelsolin protein, followed by surface deposition onto silica nanoparticles. This solid-phase system was exposed to serum samples containing various concentrations of LPA and analyzed by fluorescence microscopy. Measurements conducted for the LPA-containing serum samples were higher after exposure to the developed test than samples without LPA. Early results suggest a limit of detection of 5 μM LPA in serum. The eventual goal is to employ the chemistry described here in a biosensor configuration for the large population-scale, rapid screening of women for the potential occurrence of ovarian cancer.
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Xu Y. Targeting Lysophosphatidic Acid in Cancer: The Issues in Moving from Bench to Bedside. Cancers (Basel) 2019; 11:E1523. [PMID: 31658655 PMCID: PMC6826372 DOI: 10.3390/cancers11101523] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 10/02/2019] [Accepted: 10/08/2019] [Indexed: 12/16/2022] Open
Abstract
Since the clear demonstration of lysophosphatidic acid (LPA)'s pathological roles in cancer in the mid-1990s, more than 1000 papers relating LPA to various types of cancer were published. Through these studies, LPA was established as a target for cancer. Although LPA-related inhibitors entered clinical trials for fibrosis, the concept of targeting LPA is yet to be moved to clinical cancer treatment. The major challenges that we are facing in moving LPA application from bench to bedside include the intrinsic and complicated metabolic, functional, and signaling properties of LPA, as well as technical issues, which are discussed in this review. Potential strategies and perspectives to improve the translational progress are suggested. Despite these challenges, we are optimistic that LPA blockage, particularly in combination with other agents, is on the horizon to be incorporated into clinical applications.
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Affiliation(s)
- Yan Xu
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, 950 W. Walnut Street R2-E380, Indianapolis, IN 46202, USA.
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Cai H, Cao T, Li N, Fang P, Xu P, Wu X, Zhang B, Xiang D. Quantitative monitoring of a panel of stress-induced biomarkers in human plasma by liquid chromatography-tandem mass spectrometry: an application in a comparative study between depressive patients and healthy subjects. Anal Bioanal Chem 2019; 411:5765-5777. [PMID: 31201457 DOI: 10.1007/s00216-019-01956-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Revised: 05/21/2019] [Accepted: 05/29/2019] [Indexed: 02/01/2023]
Abstract
Using a metabolomic approach, we have found that stress can induce oxidative damage by disturbing the creatine/phosphocreatine shuttle system and purinergic pathway, leading to an excessive membrane breakdown. To further validate our findings and to monitor the biological impact of stress in research of clinical psychiatry, a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed to simultaneously determine a panel of biomarkers comprising choline, creatine, purinergic metabolites, neurosteroids, lysophosphatidylcholines, and phosphatidylethanolamines in human plasma. After optimization of the extraction protocol, all the 15 analytes plus 4 internal standards with distinct polarities were extracted into an organic phase using methyl tert-butyl ether/methanol (1:1, v/v). A reversed-phase C8 column under gradient elution consisting of aqueous phase A of 5 mM ammonium acetate buffer solution containing 0.1% formic acid and organic phase B of acetonitrile/2-propanol (3:7, v/v) was utilized for separation. Four sequential periods under positive or negative ion mode were combined for the determination of analytes with specific multiple reaction monitoring transitions. For all analytes, this method exhibited good linearity with coefficients of determination (R2) higher than 0.99. The lower limit of quantification (LLOQ) values ranged from 0.05 to 80.0 ng/mL. Recovery between 70.5 and 97.3% was obtained by spiking standards to plasma samples stripped by powdered activated carbon. The intra- and inter-assay relative standard deviations (RSDs) of the analyses varied between 2.0 and 13.3%. The mean accuracy ranged from 90.6 to 109.0%. The matrix effect ranged from 91.2 to 107.3% with variations less than 9.0%. Stability under different conditions was tested, with mean recoveries varying between 90.4 and 109.7%. Finally, the established method was successfully applied to analyze the plasma samples from a small cohort of 30 patients with major depressive disorder and 30 matched healthy controls. Graphical abstract.
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Affiliation(s)
- HuaLin Cai
- Department of Pharmacy, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China.
- Institute of Clinical Pharmacy, Central South University, Changsha, 410011, Hunan, China.
| | - Ting Cao
- Department of Pharmacy, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China
- Institute of Clinical Pharmacy, Central South University, Changsha, 410011, Hunan, China
| | - NaNa Li
- Department of Pharmacy, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China
- Institute of Clinical Pharmacy, Central South University, Changsha, 410011, Hunan, China
| | - PingFei Fang
- Department of Pharmacy, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China
- Institute of Clinical Pharmacy, Central South University, Changsha, 410011, Hunan, China
| | - Ping Xu
- Department of Pharmacy, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China
- Institute of Clinical Pharmacy, Central South University, Changsha, 410011, Hunan, China
| | - XiangXin Wu
- Department of Pharmacy, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China
- Institute of Clinical Pharmacy, Central South University, Changsha, 410011, Hunan, China
| | - BiKui Zhang
- Department of Pharmacy, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China
- Institute of Clinical Pharmacy, Central South University, Changsha, 410011, Hunan, China
| | - DaXiong Xiang
- Department of Pharmacy, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China.
- Institute of Clinical Pharmacy, Central South University, Changsha, 410011, Hunan, China.
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14
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Yagi T, Shoaib M, Kuschner C, Nishikimi M, Becker LB, Lee AT, Kim J. Challenges and Inconsistencies in Using Lysophosphatidic Acid as a Biomarker for Ovarian Cancer. Cancers (Basel) 2019; 11:cancers11040520. [PMID: 30979045 PMCID: PMC6521627 DOI: 10.3390/cancers11040520] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 03/27/2019] [Accepted: 04/09/2019] [Indexed: 12/31/2022] Open
Abstract
Increased detection of plasma lysophosphatidic acid (LPA) has been proposed as a potential diagnostic biomarker in ovarian cancer, but inconsistency exists in these reports. It has been shown that LPA can undergo an artificial increase during sample processing and analysis, which has not been accounted for in ovarian cancer research. The aim of this study is to provide a potential explanation about how the artificial increase in LPA may have interfered with previous LPA analysis in ovarian cancer research. Using an established LC-MS method, we measured LPA and other lysophospholipid levels in plasma obtained from three cohorts of patients: non-cancer controls, patients with benign ovarian tumors, and those with ovarian cancer. We did not find the LPA level to be higher in cancer samples. To understand this inconsistency, we observed that LPA content changed more significantly than other lysophospholipids as a function of plasma storage time while frozen. Additionally, only LPA was found to be adversely impacted by incubation time depending on the Ethylenediaminetetraacetic acid (EDTA) concentration used during blood drawing. We also show that the inhibition of autotaxin effectively prevented artificial LPA generation during incubation at room temperature. Our data suggests that the artificial changes in LPA content may contribute to the discrepancies reported in literature. Any future studies planning to measure plasma LPA should carefully design the study protocol to consider these confounding factors.
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Affiliation(s)
- Tsukasa Yagi
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research, 350 Community Dr., Manhasset, NY 11030, USA.
| | - Muhammad Shoaib
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research, 350 Community Dr., Manhasset, NY 11030, USA.
- Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, 500 Hofstra Blvd, Hempstead, NY 11549, USA.
| | - Cyrus Kuschner
- Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, 500 Hofstra Blvd, Hempstead, NY 11549, USA.
| | - Mitsuaki Nishikimi
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research, 350 Community Dr., Manhasset, NY 11030, USA.
| | - Lance B Becker
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research, 350 Community Dr., Manhasset, NY 11030, USA.
- Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, 500 Hofstra Blvd, Hempstead, NY 11549, USA.
| | - Annette T Lee
- Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, 500 Hofstra Blvd, Hempstead, NY 11549, USA.
- Robert S. Boas Center for Genomics & Human Genetics, Feinstein Institute for Medical Research, 350 Community Dr., Manhasset, NY 11030, USA.
| | - Junhwan Kim
- Center for Immunology and Inflammation, Feinstein Institute for Medical Research, 350 Community Dr., Manhasset, NY 11030, USA.
- Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, 500 Hofstra Blvd, Hempstead, NY 11549, USA.
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15
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Mika A, Sledzinski T, Stepnowski P. Current Progress of Lipid Analysis in Metabolic Diseases by Mass Spectrometry Methods. Curr Med Chem 2019; 26:60-103. [PMID: 28971757 DOI: 10.2174/0929867324666171003121127] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 09/14/2016] [Accepted: 10/10/2016] [Indexed: 12/11/2022]
Abstract
BACKGROUND Obesity, insulin resistance, diabetes, and metabolic syndrome are associated with lipid alterations, and they affect the risk of long-term cardiovascular disease. A reliable analytical instrument to detect changes in the composition or structures of lipids and the tools allowing to connect changes in a specific group of lipids with a specific disease and its progress, is constantly lacking. Lipidomics is a new field of medicine based on the research and identification of lipids and lipid metabolites present in human organism. The primary aim of lipidomics is to search for new biomarkers of different diseases, mainly civilization diseases. OBJECTIVE We aimed to review studies reporting the application of mass spectrometry for lipid analysis in metabolic diseases. METHOD Following an extensive search of peer-reviewed articles on the mass spectrometry analysis of lipids the literature has been discussed in this review article. RESULTS The lipid group contains around 1.7 million species; they are totally different, in terms of the length of aliphatic chain, amount of rings, additional functional groups. Some of them are so complex that their complex analyses are a challenge for analysts. Their qualitative and quantitative analysis of is based mainly on mass spectrometry. CONCLUSION Mass spectrometry techniques are excellent tools for lipid profiling in complex biological samples and the combination with multivariate statistical analysis enables the identification of potential diagnostic biomarkers.
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Affiliation(s)
- Adriana Mika
- Department of Environmental Analysis, Faculty of Chemistry, University of Gdansk, Poland.,Department of Pharmaceutical Biochemistry, Medical University of Gdansk, Gdansk, Poland
| | - Tomasz Sledzinski
- Department of Pharmaceutical Biochemistry, Medical University of Gdansk, Gdansk, Poland
| | - Piotr Stepnowski
- Department of Environmental Analysis, Faculty of Chemistry, University of Gdansk, Poland
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16
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Gathungu RM, Larrea P, Sniatynski MJ, Marur VR, Bowden JA, Koelmel JP, Starke-Reed P, Hubbard VS, Kristal BS. Optimization of Electrospray Ionization Source Parameters for Lipidomics To Reduce Misannotation of In-Source Fragments as Precursor Ions. Anal Chem 2018; 90:13523-13532. [PMID: 30265528 PMCID: PMC6297073 DOI: 10.1021/acs.analchem.8b03436] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Lipidomics requires the accurate annotation of lipids in complex samples to enable determination of their biological relevance. We demonstrate that unintentional in-source fragmentation (ISF, common in lipidomics) generates ions that have identical masses to other lipids. Lysophosphatidylcholines (LPC), for example, generate in-source fragments with the same mass as free fatty acids and lysophosphatidylethanolamines (LPE). The misannotation of in-source fragments as true lipids is particularly insidious in complex matrixes since most masses are initially unannotated and comprehensive lipid standards are unavailable. Indeed, we show such LPE/LPC misannotations are incorporated in the data submitted to the National Institute of Standards and Technology (NIST) interlaboratory comparison exercise. Computer simulations exhaustively identified potential misannotations. The selection of in-source fragments of highly abundant lipids as features, instead of the correct recognition of trace lipids, can potentially lead to (i) missing the biologically relevant lipids (i.e., a false negative) and/or (ii) incorrect assignation of a phenotype to an incorrect lipid (i.e., false positive). When ISF is not eliminated in the negative ion mode, ∼40% of the 100 most abundant masses corresponding to unique phospholipids measured in plasma were artifacts from ISF. We show that chromatographic separation and ion intensity considerations assist in distinguishing precursor ions from in-source fragments, suggesting ISF may be especially problematic when complex samples are analyzed via shotgun lipidomics. We also conduct a systematic evaluation of electrospray ionization (ESI) source parameters on an Exactive equipped with a heated electrospray ionization (HESI-II) source with the objective of obtaining uniformly appropriate source conditions for a wide range of lipids, while, at the same time, reducing in-source fragmentation.
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Affiliation(s)
- Rose M. Gathungu
- Department of Medicine, Division of Sleep and Circadian Disorders, Brigham and Women’s Hospital and Department of Medicine, Division of Sleep Medicine, Harvard Medical School, Boston, MA 02115
| | - Pablo Larrea
- Department of Medicine, Division of Sleep and Circadian Disorders, Brigham and Women’s Hospital and Department of Medicine, Division of Sleep Medicine, Harvard Medical School, Boston, MA 02115
| | - Matthew J. Sniatynski
- Department of Medicine, Division of Sleep and Circadian Disorders, Brigham and Women’s Hospital and Department of Medicine, Division of Sleep Medicine, Harvard Medical School, Boston, MA 02115
| | - Vasant R. Marur
- Department of Medicine, Division of Sleep and Circadian Disorders, Brigham and Women’s Hospital and Department of Medicine, Division of Sleep Medicine, Harvard Medical School, Boston, MA 02115
| | - John A. Bowden
- Center for Environmental and Human Toxicology, Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, 32610
- National Institute of Standards and Technology, Hollings Marine Laboratory, Charleston, SC 29412
| | - Jeremy P. Koelmel
- Department of Pathology, Immunology, and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL 32610
| | - Pamela Starke-Reed
- Deputy Director, NIH Division of Nutrition Research Coordination, Bethesda, MD 20892
| | - Van S. Hubbard
- Director, NIH Division of Nutrition Research Coordination, Bethesda, MD 20892
| | - Bruce S. Kristal
- Department of Medicine, Division of Sleep and Circadian Disorders, Brigham and Women’s Hospital and Department of Medicine, Division of Sleep Medicine, Harvard Medical School, Boston, MA 02115
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17
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Qualitative and quantitative comparison of cyclic phosphatidic acid and its related lipid species in rat serum using hydrophilic interaction liquid chromatography with tandem-mass spectrometry. J Chromatogr A 2018; 1567:177-184. [DOI: 10.1016/j.chroma.2018.07.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 06/26/2018] [Accepted: 07/02/2018] [Indexed: 12/15/2022]
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18
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Lysophospholipid Signaling in the Epithelial Ovarian Cancer Tumor Microenvironment. Cancers (Basel) 2018; 10:cancers10070227. [PMID: 29987226 PMCID: PMC6071084 DOI: 10.3390/cancers10070227] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 07/03/2018] [Accepted: 07/05/2018] [Indexed: 12/12/2022] Open
Abstract
As one of the important cancer hallmarks, metabolism reprogramming, including lipid metabolism alterations, occurs in tumor cells and the tumor microenvironment (TME). It plays an important role in tumorigenesis, progression, and metastasis. Lipids, and several lysophospholipids in particular, are elevated in the blood, ascites, and/or epithelial ovarian cancer (EOC) tissues, making them not only useful biomarkers, but also potential therapeutic targets. While the roles and signaling of these lipids in tumor cells are extensively studied, there is a significant gap in our understanding of their regulations and functions in the context of the microenvironment. This review focuses on the recent study development in several oncolipids, including lysophosphatidic acid and sphingosine-1-phosphate, with emphasis on TME in ovarian cancer.
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19
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Hwang SM, Kim HJ, Kim SM, Jung Y, Park SW, Chung IY. Lysophosphatidylserine receptor P2Y10: A G protein-coupled receptor that mediates eosinophil degranulation. Clin Exp Allergy 2018; 48:990-999. [PMID: 29700886 DOI: 10.1111/cea.13162] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 04/13/2018] [Accepted: 04/16/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND P2Y10, along with GPR34 and GPR174, is a G protein-coupled receptor that is activated by an endogenous lipid mediator lysophosphatidylserine (LysoPS). Its expression pattern and its function are completely unknown. We have previously shown that P2Y10 is one of the highly up-regulated genes at the late differentiation stage during in vitro eosinophilopoiesis. OBJECTIVE We explored the expression and functions of P2Y10 in human cord blood (CB)-derived and peripheral blood (PB) eosinophils. METHODS Real-time PCR, FACS, Western blot, ELISA, and chemotaxis assays were performed to determine the expression and function of P2Y10. RESULTS As CB cells differentiated towards eosinophils, P2Y10 mRNA and protein were abundantly expressed. P2Y10 was the most highly expressed in the granulocytes from PB, to a lesser extent in monocytes, and least in lymphocytes. Further fractionation of granulocytes revealed that eosinophils express P2Y10 much more strongly than do neutrophils. PB eosinophils solely expressed P2Y10 among the three LysoPS receptors, while PB neutrophils expressed the three at comparable levels. LysoPS activated both CB and PB eosinophils to induce a robust ERK phosphorylation. Importantly, LysoPS was capable of triggering degranulation of ECP in PB eosinophils. This response was significantly reduced by pharmacological inhibitors of TNF-alpha-converting enzyme (TACE), epidermal growth factor receptor (EGFR), and ERK1/2, which were known to be required in P2Y10-mediated signalling pathways. However, LysoPS had no effect on chemotaxis, differentiation, or eosinophil survival. CONCLUSIONS AND CLINICAL RELEVANCE LysoPS provokes eosinophil degranulation through P2Y10. Therefore, P2Y10 is a potential therapeutic target to control eosinophil-associated diseases.
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Affiliation(s)
- S M Hwang
- Department of Bionano Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
| | - H J Kim
- Department of Bionano Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
| | - S M Kim
- Department of Bionano Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
| | - Y Jung
- Department of Microbiology, School of Medicine, Gachon University, Incheon, Korea
| | - S W Park
- Graduate School of Medicine, Soonchunhyang University Hospital, Bucheon, Gyeonggi-do, Korea
| | - I Y Chung
- Department of Bionano Technology, Hanyang University, Ansan, Gyeonggi-do, Korea.,Division of Molecular and Life Sciences, College of Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
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20
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Schoeman JC, Harms AC, van Weeghel M, Berger R, Vreeken RJ, Hankemeier T. Development and application of a UHPLC-MS/MS metabolomics based comprehensive systemic and tissue-specific screening method for inflammatory, oxidative and nitrosative stress. Anal Bioanal Chem 2018; 410:2551-2568. [PMID: 29497765 PMCID: PMC5857282 DOI: 10.1007/s00216-018-0912-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 01/15/2018] [Accepted: 01/23/2018] [Indexed: 12/18/2022]
Abstract
Oxidative stress and inflammation are underlying pathogenic mechanisms associated with the progression of several pathological conditions and immunological responses. Elucidating the role of signalling lipid classes, which include, among others, the isoprostanes, nitro fatty acids, prostanoids, sphingoid bases and lysophosphatidic acids, will create a snapshot of the cause and effect of inflammation and oxidative stress at the metabolic level. Here we describe a fast, sensitive, and targeted ultra-high-performance liquid chromatography-tandem mass spectrometry metabolomics method that allows the quantitative measurement and biological elucidation of 17 isoprostanes as well as their respective isomeric prostanoid mediators, three nitro fatty acids, four sphingoid mediators, and 24 lysophosphatidic acid species from serum as well as organ tissues, including liver, lung, heart, spleen, kidney and brain. Application of this method to paired mouse serum and tissue samples revealed tissue- and serum-specific stress and inflammatory readouts. Little correlation was found between localized (tissue) metabolite levels compared with the systemic (serum) circulation in a homeostatic model. The application of this method in future studies will enable us to explore the role of signalling lipids in the metabolic pathogenicity of stress and inflammation during health and disease.
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Affiliation(s)
- Johannes C Schoeman
- Department of Analytical Biosciences, Leiden Academic Centre for Drug Research, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands. .,Netherlands Metabolomics Centre, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands.
| | - Amy C Harms
- Department of Analytical Biosciences, Leiden Academic Centre for Drug Research, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands.,Netherlands Metabolomics Centre, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands
| | - Michel van Weeghel
- Department of Analytical Biosciences, Leiden Academic Centre for Drug Research, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands.,Laboratory for Neurophysiology, Department of Molecular Cell Biology, Leiden University Medical Center, Einthovenweg 20, 2333 ZC, Leiden, Netherlands.,Department of Clinical Chemistry, Laboratory Genetic Metabolic Diseases, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, Netherlands
| | - Ruud Berger
- Department of Analytical Biosciences, Leiden Academic Centre for Drug Research, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands.,Netherlands Metabolomics Centre, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands
| | - Rob J Vreeken
- Department of Analytical Biosciences, Leiden Academic Centre for Drug Research, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands.,Netherlands Metabolomics Centre, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands.,Discovery Sciences, Janssen R&D, Turnhoutseweg 30, 2340, Beerse, Belgium
| | - Thomas Hankemeier
- Department of Analytical Biosciences, Leiden Academic Centre for Drug Research, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands.,Netherlands Metabolomics Centre, Leiden University, Einsteinweg 55, 2333 CC, Leiden, Netherlands
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21
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Wang M, Wang C, Han X. Selection of internal standards for accurate quantification of complex lipid species in biological extracts by electrospray ionization mass spectrometry-What, how and why? MASS SPECTROMETRY REVIEWS 2017; 36:693-714. [PMID: 26773411 PMCID: PMC4947032 DOI: 10.1002/mas.21492] [Citation(s) in RCA: 184] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 12/28/2015] [Indexed: 05/20/2023]
Abstract
Lipidomics is rapidly expanding because of the great facilitation of recent advances in, and novel applications of, electrospray ionization mass spectrometry techniques. The greatest demands have been for successful quantification of lipid classes, subclasses, and individual molecular species in biological samples at acceptable accuracy. This review addresses the selection of internal standards in different methods for accurate quantification of individual lipid species. The principles of quantification with electrospray ionization mass spectrometry are first discussed to recognize the essentials for quantification. The basics of different lipidomics approaches are overviewed to understand the variables that need to be considered for accurate quantification. The factors that affect accurate quantification are extensively discussed, and the solutions to resolve these factors are proposed-largely through addition of internal standards. Finally, selection of internal standards for different methods is discussed in detail to address the issues of what, how, and why related to internal standards. We believe that thorough discussion of the topics related to internal standards should aid in quantitative analysis of lipid classes, subclasses, and individual molecular species and should have big impacts on advances in lipidomics. © 2016 Wiley Periodicals, Inc. Mass Spec Rev 36:693-714, 2017.
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Affiliation(s)
- Miao Wang
- Center for Metabolic Origins of Disease, Sanford Burnham Prebys Medical Discovery Institute, Orlando, FL 32827 USA
| | - Chunyan Wang
- Center for Metabolic Origins of Disease, Sanford Burnham Prebys Medical Discovery Institute, Orlando, FL 32827 USA
| | - Xianlin Han
- Center for Metabolic Origins of Disease, Sanford Burnham Prebys Medical Discovery Institute, Orlando, FL 32827 USA
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, 548 Bingwen Road, Hangzhou, Zhejiang 310053, China
- To whom correspondence should be addressed: Xianlin Han, Ph.D., Center for Metabolic Origins of Disease, Sanford Burnham Prebys Medical Discovery Institute, 6400 Sanger Road, Orlando, Florida 32827, USA, Telephone: (407) 745-2139, Fax: (407) 745-2016,
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22
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Gu C, Wang F, Zhao Z, Wang H, Cong X, Chen X. Lysophosphatidic Acid Is Associated with Atherosclerotic Plaque Instability by Regulating NF-κB Dependent Matrix Metalloproteinase-9 Expression via LPA 2 in Macrophages. Front Physiol 2017; 8:266. [PMID: 28496416 PMCID: PMC5406459 DOI: 10.3389/fphys.2017.00266] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Accepted: 04/11/2017] [Indexed: 01/18/2023] Open
Abstract
Lysophosphatidic acid (LPA), one of the simplest phospholipid signaling molecules, participates in formation and disruption of atherosclerotic plaque. Matrix metalloproteinases (MMPs) contribute to atherosclerotic plaque rupture by involving in extracellular matrix (ECM) degradation and then thinning fibrous cap. Our previous study demonstrated that macrophage-derived MMP-9 was associated with coronary plaque instability, but the relationship between LPA and MMP-9 remains unclear. The present work therefore aimed at elucidating association between LPA and MMP-9 and the regulation mechanism of LPA on MMP-9 in macrophages. We found that plasma LPA and MMP-9 levels were correlated positively (r = 0.31, P < 0.05) and both elevated significantly in patients with acute myocardial infarct (AMI). Consistent with peripheral blood levels, histochemical staining indicated that autotaxin (ATX), LPA-producing ectoenzyme, and MMP-9 were expressed frequently in the necrotic core and fibrous cap of human unstable plaques, which might increase the instability of plaque. Experiments in vitro were done with THP-1-derived macrophages and showed that LPA enhanced the expression, secretion and activity of MMP-9 in a time- and dose-dependent manner. Induction of LPA on pro-MMP-9 and active-MMP-9 was confirmed in human peripheral blood monocyte-derived macrophages. PDTC, NF-κB inhibitor, but not inhibitor of AP-1 and PPARγ, effectively prevented LPA-induced MMP-9 expression and NF-κB p65 siRNA decreased MMP-9 transcription, confirming that LPA might induce MMP-9 elevation by activating NF-κB pathway. In addition, knockdown of LPA2 attenuated LPA-induced MMP-9 expression and nucleus p65 levels. These findings revealed that LPA upregulated the expression of MMP-9 through activating NF-κB pathway in the LPA2 dependent manner, hence blocking LPA receptors signaling may provide therapeutic strategy to target plaque destabilization.
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Affiliation(s)
- Chun Gu
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing, China
| | - Fang Wang
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing, China
| | - Zhenwen Zhao
- Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry Chinese Academy of ScienceBeijing, China
| | - Hongyue Wang
- Department of Pathology, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing, China
| | - Xiangfeng Cong
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing, China
| | - Xi Chen
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing, China
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23
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Bielow C, Mastrobuoni G, Orioli M, Kempa S. On Mass Ambiguities in High-Resolution Shotgun Lipidomics. Anal Chem 2017; 89:2986-2994. [PMID: 28193003 DOI: 10.1021/acs.analchem.6b04456] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Mass-spectrometry-based lipidomics aims to identify as many lipid species as possible from complex biological samples. Due to the large combinatorial search space, unambiguous identification of lipid species is far from trivial. Mass ambiguities are common in direct-injection shotgun experiments, where an orthogonal separation (e.g., liquid chromatography) is missing. Using the rich information within available lipid databases, we generated a comprehensive rule set describing mass ambiguities, while taking into consideration the resolving power (and its decay) of different mass analyzers. Importantly, common adduct species and isotopic peaks are accounted for and are shown to play a major role, both for perfect mass overlaps due to identical sum formulas and resolvable mass overlaps. We identified known and hitherto unknown mass ambiguities in high- and ultrahigh resolution data, while also ranking lipid classes by their propensity to cause ambiguities. On the basis of this new set of ambiguity rules, guidelines and recommendations for experimentalists and software developers of what constitutes a solid lipid identification in both MS and MS/MS were suggested. For researchers new to the field, our results are a compact source of ambiguities which should be accounted for. These new findings also have implications for the selection of internal standards, peaks used for internal mass calibration, optimal choice of instrument resolution, and sample preparation, for example, in regard to adduct ion formation.
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Affiliation(s)
- Chris Bielow
- Berlin Institute of Health Technology Platform Metabolomics, Max-Delbrück-Centrum for Molecular Medicine, Robert-Rössle-Straße 10, 13125 Berlin-Buch, Germany
| | - Guido Mastrobuoni
- Berlin Institute for Medical Systems Biology, Max-Delbrück-Centrum for Molecular Medicine, Robert-Rössle-Straße 10, 13125 Berlin-Buch, Germany
| | - Marica Orioli
- Berlin Institute for Medical Systems Biology, Max-Delbrück-Centrum for Molecular Medicine, Robert-Rössle-Straße 10, 13125 Berlin-Buch, Germany
| | - Stefan Kempa
- Berlin Institute of Health Technology Platform Metabolomics, Max-Delbrück-Centrum for Molecular Medicine, Robert-Rössle-Straße 10, 13125 Berlin-Buch, Germany.,Berlin Institute for Medical Systems Biology, Max-Delbrück-Centrum for Molecular Medicine, Robert-Rössle-Straße 10, 13125 Berlin-Buch, Germany
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24
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Wang J, Sibrian-Vazquez M, Escobedo JO, Wang L, Chu YH, Moore RG, Strongin RM. Templated polymers enable selective capture and release of lysophosphatidic acid in human plasma via optimization of non-covalent binding to functional monomers. Analyst 2016; 140:7572-7. [PMID: 26455441 DOI: 10.1039/c5an01597a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The first solid phase extraction materials for selective lysophosphatidic acid (LPA) enrichment from human plasma are described. Molecularly imprinted polymers were designed, synthesized and evaluated as cartridge fillings. They enabled a relatively rapid and simple extraction protocol for LPA without any need for multiple liquid-liquid extraction steps. The five major subspecies of lysophosphatidic acid are readily separated from all other native plasma phospholipids, including those well-known to interfere with LPA quantitation, such as phosphatidylcholine and lysophosphatidylcholine. Outstanding LPA purity is obtained via these solid phase materials in a tandem extraction setup.
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Affiliation(s)
- Jialu Wang
- Department of Chemistry, Portland State University, Portland, OR 97201, USA.
| | | | - Jorge O Escobedo
- Department of Chemistry, Portland State University, Portland, OR 97201, USA.
| | - Lei Wang
- Department of Chemistry, Portland State University, Portland, OR 97201, USA.
| | - Yu-Hsuan Chu
- Department of Chemistry, Portland State University, Portland, OR 97201, USA.
| | - Richard G Moore
- Women and Infants Hospital, Brown University, Providence, RI 02905, USA
| | - Robert M Strongin
- Department of Chemistry, Portland State University, Portland, OR 97201, USA.
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25
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The Lipidomic Analyses in Low and Highly Aggressive Ovarian Cancer Cell Lines. Lipids 2015; 51:179-87. [PMID: 26661829 DOI: 10.1007/s11745-015-4108-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 11/23/2015] [Indexed: 01/06/2023]
Abstract
Despite huge advances in the research of epithelial ovarian cancer (EOC), it remains the most lethal gynecological malignancy. Peritoneal tumor cell dissemination with cell survival and drug-resistance to taxane and platinum-based chemotherapy are two of the major challenges of EOC treatment. We have generated highly aggressive EOC cell lines (ID8-P1 lines or P1) from ID8-P0 (without in vivo passage, or P0) through in vivo passage in mice. We conducted lipidomic analyses in cells from ID8-P0 versus three ID8-P1 cell lines using ultra-high-performance liquid chromatography coupled to electrospray ionization tandem mass spectrometry. A total of 16 classes of lipids (149 individual lipids) were analyzed and compared between P0 and P1 cells. In addition to overall lipid profiles in EOC cells, we had several novel observations. Several classes and species of lipids have been identified to be differentially present in P0 versus P1 cells, which are potentially involved in the acquired aggressiveness of P1 cells. Triacylglycerols (TAG) were dramatically increased under detachment stress in EOC cells. Since survival of EOC cells under detachment is one of the major obstacles for EOC treatment, further studies identifying the molecular mechanisms controlling TAG increase may lead to new treatment modalities for EOC.
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26
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Song J, Guan M, Zhao Z, Zhang J. Type I Interferons Function as Autocrine and Paracrine Factors to Induce Autotaxin in Response to TLR Activation. PLoS One 2015; 10:e0136629. [PMID: 26313906 PMCID: PMC4552386 DOI: 10.1371/journal.pone.0136629] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2015] [Accepted: 08/05/2015] [Indexed: 12/30/2022] Open
Abstract
Lysophosphatidic acid (LPA) is an important phospholipid mediator in inflammation and immunity. However, the mechanism of LPA regulation during inflammatory response is largely unknown. Autotaxin (ATX) is the key enzyme to produce extracellular LPA from lysophosphatidylcholine (LPC). In this study, we found that ATX was induced in monocytic THP-1 cells by TLR4 ligand lipopolysaccharide (LPS), TLR9 ligand CpG oligonucleotide, and TLR3 ligand poly(I:C), respectively. The ATX induction by TLR ligand was abolished by the neutralizing antibody against IFN-β or the knockdown of IFNAR1, indicating that type I IFN autocrine loop is responsible for the ATX induction upon TLR activation. Both IFN-β and IFN-α were able to induce ATX expression via the JAK-STAT and PI3K-AKT pathways but with different time-dependent manners. The ATX induction by IFN-β was dramatically enhanced by IFN-γ, which had no significant effect on ATX expression alone, suggesting a synergy effect between type I and type II IFNs in ATX induction. Extracellular LPA levels were significantly increased when THP-1 cells were treated with IFN-α/β or TLR ligands. In addition, the type I IFN-mediated ATX induction was identified in human monocyte-derived dendritic cells (moDCs) stimulated with LPS or poly(I:C), and IFN-α/β could induce ATX expression in human peripheral blood mononuclear cells (PBMCs) and monocytes isolated form blood samples. These results suggest that, in response to TLR activation, ATX is induced through a type I INF autocrine-paracrine loop to enhance LPA generation.
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Affiliation(s)
- Jianwen Song
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, Institute of Cell Biology, College of Life Sciences, Beijing Normal University, Beijing, China
| | - Ming Guan
- Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry Chinese Academy of Sciences, Beijing, China
| | - Zhenwen Zhao
- Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry Chinese Academy of Sciences, Beijing, China
| | - Junjie Zhang
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, Institute of Cell Biology, College of Life Sciences, Beijing Normal University, Beijing, China
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27
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Wang C, Wang M, Han X. Comprehensive and quantitative analysis of lysophospholipid molecular species present in obese mouse liver by shotgun lipidomics. Anal Chem 2015; 87:4879-87. [PMID: 25860968 DOI: 10.1021/acs.analchem.5b00410] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Shotgun lipidomics exploits the unique chemical and physical properties of lipid classes and individual molecular species to facilitate the high-throughput analysis of a cellular lipidome on a large scale directly from the extracts of biological samples. A platform for comprehensive analysis of lysophospholipid (LPL) species based on shotgun lipidomics has not been established. Herein, after extensive characterization of the fragmentation pattern of individual LPL class and optimization of all experimental conditions including developing new methods for optimization of collision energy, and recovery and enrichment of LPL classes from the aqueous phase after solvent extraction, a new method for comprehensive and quantitative analysis of LPL species was developed. This newly developed method was applied for comprehensive analysis of LPL species present in mouse liver samples. Remarkably, the study revealed significant accumulation of LPL species in the liver of ob/ob mice. Taken together, by exploiting the principles of shotgun lipidomics in combination with a novel strategy of sample preparation, LPL species present in biological samples can be determined by the established method. We believe that this development is significant and useful for understanding the pathways of phospholipid metabolism and for elucidating the role of LPL species in signal transduction and other biological functions.
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Affiliation(s)
- Chunyan Wang
- Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, Florida 32827, United States
| | - Miao Wang
- Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, Florida 32827, United States
| | - Xianlin Han
- Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, Florida 32827, United States
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28
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Ultra-high-performance liquid chromatography electrospray ionization tandem mass spectrometry for accurate analysis of glycerophospholipids and sphingolipids in drug resistance tumor cells. J Chromatogr A 2015; 1381:140-8. [DOI: 10.1016/j.chroma.2015.01.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 01/07/2015] [Accepted: 01/08/2015] [Indexed: 01/24/2023]
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29
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Wang L, Sibrian-Vazquez M, Escobedo JO, Wang J, Moore RG, Strongin RM. Spiroguanidine rhodamines as fluorogenic probes for lysophosphatidic acid. Chem Commun (Camb) 2015; 51:1697-700. [PMID: 25516957 PMCID: PMC4320994 DOI: 10.1039/c4cc08818b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Direct determination of total lysophosphatidic acid (LPA) was accomplished using newly developed spiroguanidines derived from rhodamine B as universal fluorogenic probes. Optimum conditions for the quantitative analysis of total LPA were investigated. The linear range for the determination of total LPA is up to 5 μM with a limit of detection of 0.512 μM.
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Affiliation(s)
- Lei Wang
- Department of Chemistry, Portland State University, Portland, OR 97201, USA. Tel: +1-503-725-9724
| | - Martha Sibrian-Vazquez
- Department of Chemistry, Portland State University, Portland, OR 97201, USA. Tel: +1-503-725-9724
| | - Jorge O. Escobedo
- Department of Chemistry, Portland State University, Portland, OR 97201, USA. Tel: +1-503-725-9724
| | - Jialu Wang
- Department of Chemistry, Portland State University, Portland, OR 97201, USA. Tel: +1-503-725-9724
| | - Richard G. Moore
- Women and Infants Hospital, Brown University, 101 Dudley Street, Providence, RI 02905, USA; Tel: +1-401-453-7520
| | - Robert M. Strongin
- Department of Chemistry, Portland State University, Portland, OR 97201, USA. Tel: +1-503-725-9724
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30
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Li L, Han J, Wang Z, Liu J, Wei J, Xiong S, Zhao Z. Mass spectrometry methodology in lipid analysis. Int J Mol Sci 2014; 15:10492-507. [PMID: 24921707 PMCID: PMC4100164 DOI: 10.3390/ijms150610492] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 05/22/2014] [Accepted: 05/28/2014] [Indexed: 12/20/2022] Open
Abstract
Lipidomics is an emerging field, where the structures, functions and dynamic changes of lipids in cells, tissues or body fluids are investigated. Due to the vital roles of lipids in human physiological and pathological processes, lipidomics is attracting more and more attentions. However, because of the diversity and complexity of lipids, lipid analysis is still full of challenges. The recent development of methods for lipid extraction and analysis and the combination with bioinformatics technology greatly push forward the study of lipidomics. Among them, mass spectrometry (MS) is the most important technology for lipid analysis. In this review, the methodology based on MS for lipid analysis was introduced. It is believed that along with the rapid development of MS and its further applications to lipid analysis, more functional lipids will be identified as biomarkers and therapeutic targets and for the study of the mechanisms of disease.
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Affiliation(s)
- Lin Li
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing Mass Spectrum Center, Beijing 100190, China.
| | - Juanjuan Han
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing Mass Spectrum Center, Beijing 100190, China.
| | - Zhenpeng Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing Mass Spectrum Center, Beijing 100190, China.
| | - Jian'an Liu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing Mass Spectrum Center, Beijing 100190, China.
| | - Jinchao Wei
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing Mass Spectrum Center, Beijing 100190, China.
| | - Shaoxiang Xiong
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing Mass Spectrum Center, Beijing 100190, China.
| | - Zhenwen Zhao
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing Mass Spectrum Center, Beijing 100190, China.
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31
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Onorato JM, Shipkova P, Minnich A, Aubry AF, Easter J, Tymiak A. Challenges in accurate quantitation of lysophosphatidic acids in human biofluids. J Lipid Res 2014; 55:1784-96. [PMID: 24872406 DOI: 10.1194/jlr.d050070] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Indexed: 01/30/2023] Open
Abstract
Lysophosphatidic acids (LPAs) are biologically active signaling molecules involved in the regulation of many cellular processes and have been implicated as potential mediators of fibroblast recruitment to the pulmonary airspace, pointing to possible involvement of LPA in the pathology of pulmonary fibrosis. LPAs have been measured in various biological matrices and many challenges involved with their analyses have been documented. However, little published information is available describing LPA levels in human bronchoalveolar lavage fluid (BALF). We therefore conducted detailed investigations into the effects of extensive sample handling and sample preparation conditions on LPA levels in human BALF. Further, targeted lipid profiling of human BALF and plasma identified the most abundant lysophospholipids likely to interfere with LPA measurements. We present the findings from these investigations, highlighting the importance of well-controlled sample handling for the accurate quantitation of LPA. Further, we show that chromatographic separation of individual LPA species from their corresponding lysophospholipid species is critical to avoid reporting artificially elevated levels. The optimized sample preparation and LC/MS/MS method was qualified using a stable isotope-labeled LPA as a surrogate calibrant and used to determine LPA levels in human BALF and plasma from a Phase 0 clinical study comparing idiopathic pulmonary fibrosis patients to healthy controls.
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Affiliation(s)
- Joelle M Onorato
- Departments of Bioanalytical and Discovery Analytical Science, Bristol-Myers Squibb Co., Princeton, NJ
| | - Petia Shipkova
- Departments of Bioanalytical and Discovery Analytical Science, Bristol-Myers Squibb Co., Princeton, NJ
| | - Anne Minnich
- Exploratory Clinical and Translational Research, Bristol-Myers Squibb Co., Princeton, NJ
| | - Anne-Françoise Aubry
- Analytical and Bioanalytical Development, Bristol-Myers Squibb Co., Princeton, NJ
| | - John Easter
- Discovery Chemistry, Bristol-Myers Squibb Co., Princeton, NJ
| | - Adrienne Tymiak
- Departments of Bioanalytical and Discovery Analytical Science, Bristol-Myers Squibb Co., Princeton, NJ
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32
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Triebl A, Trötzmüller M, Eberl A, Hanel P, Hartler J, Köfeler HC. Quantitation of phosphatidic acid and lysophosphatidic acid molecular species using hydrophilic interaction liquid chromatography coupled to electrospray ionization high resolution mass spectrometry. J Chromatogr A 2014; 1347:104-10. [PMID: 24813932 DOI: 10.1016/j.chroma.2014.04.070] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 03/27/2014] [Accepted: 04/22/2014] [Indexed: 10/25/2022]
Abstract
A method for a highly selective and sensitive identification and quantitation of lysophosphatidic acid (LPA) and phosphatidic acid (PA) molecular species was developed using hydrophilic interaction liquid chromatography (HILIC) followed by negative-ion electrospray ionization high resolution mass spectrometry. Different extraction methods for the polar LPA and PA species were compared and a modified Bligh & Dyer extraction by addition of 0.1M hydrochloric acid resulted in a ≈1.2-fold increase of recovery for the 7 PA and a more than 15-fold increase for the 6 LPA molecular species of a commercially available natural mix compared to conventional Bligh & Dyer extraction. This modified Bligh & Dyer extraction did not show any artifacts resulting from hydrolysis of natural abundant phospholipids. The developed HILIC method is able to separate all PA and LPA species from major polar membrane lipid classes which might have suppressive effects on the minor abundant lipid classes of interest. The elemental compositions of intact lipid species are provided by the high mass resolution of 100,000 and high mass accuracy below 3ppm of the Orbitrap instrument. Additionally, tandem mass spectra were generated in a parallel data dependent acquisition mode in the linear ion trap to provide structural information at molecular level. Limits of quantitation were identified at 45fmol on column and the dynamic range reaches 20pmol on column, covering the range of natural abundance well. By applying the developed method to mouse brain it can be shown that phosphatidic acid contains less unsaturated fatty acids with PA 34:1 and PA 36:1 as the major species. In contrast, for LPA species a high content of polyunsaturated fatty acids (LPA 20:4 and LPA 22:6) was quantified.
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Affiliation(s)
- Alexander Triebl
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Martin Trötzmüller
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Stiftingtalstrasse 24, 8010 Graz, Austria; Omics Center Graz, Stiftingtalstrasse 24, 8010 Graz, Austria.
| | - Anita Eberl
- HEALTH - Institute for Biomedicine and Health Sciences, Joanneum Research Forschungsgesellschaft m.b.H., Graz, Austria
| | - Pia Hanel
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Jürgen Hartler
- Institute for Genomics and Bioinformatics, Graz University of Technology, Graz, Austria; Omics Center Graz, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Harald C Köfeler
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Stiftingtalstrasse 24, 8010 Graz, Austria; Omics Center Graz, Stiftingtalstrasse 24, 8010 Graz, Austria
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33
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Methods for quantifying lysophosphatidic acid in body fluids: a review. Anal Biochem 2014; 453:38-43. [PMID: 24613261 DOI: 10.1016/j.ab.2014.02.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 02/10/2014] [Accepted: 02/21/2014] [Indexed: 11/23/2022]
Abstract
Lysophosphatidic acid (LPA) is a bioactive lipid involved in cellular signal transduction. LPA plays a role in both physiological and pathological processes. Elevated levels of LPA are observed in the plasma of patients with epithelial ovarian cancer, indicating its potential as a diagnostic marker. Quantification of total LPA can be performed by radioenzymatic, fluorometric, colorimetric, or immunoezymatic assay. Determination of individual LPA molecular species requires the use of capillary electrophoresis, gas chromatography, thin layer chromatography, liquid chromatography, or a matrix-assisted laser desorption/ionization time-of-flight method connected to an appropriate detection system.
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34
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Abstract
Lysophosphatidic acid (LPA) is a potent bioactive phospholipid. As many other biological active lipids, LPA is an autacoid: it is formed locally on demand, and it acts locally near its site of synthesis. LPA has a plethora of biological activities on blood cells (platelets, monocytes) and cells of the vessel wall (endothelial cells, smooth muscle cells, macrophages) that are all key players in atherosclerotic and atherothrombotic processes. The specific cellular actions of LPA are determined by its multifaceted molecular structures, the expression of multiple G-protein coupled LPA receptors at the cell surface and their diverse coupling to intracellular signalling pathways. Numerous studies have now shown that LPA has thrombogenic and atherogenic actions. Here, we aim to provide a comprehensive, yet concise, thoughtful and critical review of this exciting research area and to pinpoint potential pharmacological targets for inhibiting thrombogenic and atherogenic activities of LPA. We hope that the review will serve to accelerate knowledge of basic and clinical science, and to foster drug development in the field of LPA and atherosclerotic/atherothrombotic diseases.
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Affiliation(s)
- Andreas Schober
- Institute for Molecular Cardiovascular Research, RWTH Aachen University, Aachen, Germany
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35
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TGFα shedding assay: an accurate and versatile method for detecting GPCR activation. Nat Methods 2012; 9:1021-9. [DOI: 10.1038/nmeth.2172] [Citation(s) in RCA: 235] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Accepted: 08/07/2012] [Indexed: 01/26/2023]
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36
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Cai Q, Zhao Z, Antalis C, Yan L, Del Priore G, Hamed AH, Stehman FB, Schilder JM, Xu Y. Elevated and secreted phospholipase A₂ activities as new potential therapeutic targets in human epithelial ovarian cancer. FASEB J 2012; 26:3306-20. [PMID: 22767227 PMCID: PMC3405265 DOI: 10.1096/fj.12-207597] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 04/23/2012] [Indexed: 11/11/2022]
Abstract
Ascites in epithelial ovarian cancer (EOC) promotes tumor development by mechanisms that are incompletely understood. Lysophosphatidic acid (LPA), a major tumor-promoting factor in EOC ascites, is an enzymatic product of autotaxin (ATX) and phospholipase A(2) (PLA(2))enzymes. The contribution of PLA(2) activities to ovarian tumorigenesis was investigated. The quantitative measurement of PLA(2) activities in ascites and tissues, as well as assay conditions selective for PLA(2) subtypes, were optimized and validated. PLA(2) activities correlated with tumor-promoting activates in cell-based and in vivo assays. High activities consistent with both cytosolic and calcium-independent PLA(2) were found in human EOC ascites for the first time. Elevated PLA(2) and ATX activities were also observed in EOC compared to benign tumors and normal tissues. Cell-free and vesicle-free (S4) human EOC ascites potently promoted proliferation, migration, and invasion of human EOC cells in a PLA(2)-dependent manner. LPA mediated a significant part of the cell-stimulating effects of ascites. S4 ascites stimulated tumorigenesis/metastasis in vivo, and methyl arachidonyl fluorophosphonate was highly effective in inhibiting EOC metastasis in mouse xenograft models. PLA(2) activity was found in conditioned media from both EOC cells and macrophages. Collectively, our work implies that PLA(2) activity is a potential marker and therapeutic target in EOC.
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Affiliation(s)
| | | | | | - Libo Yan
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Giuseppe Del Priore
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Ali Hassan Hamed
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Frederick B. Stehman
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Jeanne M. Schilder
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Yan Xu
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, Indiana, USA
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37
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Becker S, Kortz L, Helmschrodt C, Thiery J, Ceglarek U. LC–MS-based metabolomics in the clinical laboratory. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 883-884:68-75. [DOI: 10.1016/j.jchromb.2011.10.018] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Revised: 10/13/2011] [Accepted: 10/14/2011] [Indexed: 10/16/2022]
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38
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Liebisch G, Scherer M. Quantification of bioactive sphingo- and glycerophospholipid species by electrospray ionization tandem mass spectrometry in blood. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 883-884:141-6. [PMID: 22100558 DOI: 10.1016/j.jchromb.2011.10.037] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 10/25/2011] [Accepted: 10/28/2011] [Indexed: 11/24/2022]
Abstract
Bioactive glycerophospho- and sphingolipids species are involved in the regulation of numerous biological processes and implicated in the pathophysiology of various diseases. Here we review electrospray ionization tandem mass spectrometric (ESI-MS/MS) methods for the analysis of these bioactive lipid species in blood including lysophosphatidic acid (LPA), lysophosphatidylcholine (LPC), bis(monoacylglycero)phosphate (BMP), ceramide (Cer), sphingosine-1-phosphate (S1P) and sphingosylphosphorylcholine (SPC). Beside direct tandem mass spectrometric and liquid chromatography coupled approaches, we present an overview of concentrations of these bioactive lipids in plasma. The analytical strategies are discussed together with aspects of sample preparation, quantification and sample stability.
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Affiliation(s)
- Gerhard Liebisch
- Institute of Clinical Chemistry and Laboratory Medicine, University of Regensburg, Regensburg, Germany.
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39
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Funke M, Zhao Z, Xu Y, Chun J, Tager AM. The lysophosphatidic acid receptor LPA1 promotes epithelial cell apoptosis after lung injury. Am J Respir Cell Mol Biol 2011; 46:355-64. [PMID: 22021336 DOI: 10.1165/rcmb.2010-0155oc] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Increased epithelial cell apoptosis in response to lung injury has been implicated in the development of idiopathic pulmonary fibrosis (IPF), but the molecular pathways promoting epithelial cell apoptosis in this disease have yet to be fully identified. Lysophosphatidic acid (LPA), which we have previously demonstrated to mediate bleomycin lung injury-induced fibroblast recruitment and vascular leak in mice and fibroblast recruitment in patients with IPF, is an important regulator of survival and apoptosis in many cell types. We now show that LPA signaling through its receptor LPA(1) promotes epithelial cell apoptosis induced by bleomycin injury. The number of apoptotic cells present in the alveolar and bronchial epithelia of LPA(1)-deficient mice was significantly reduced compared with wild-type mice at Day 3 after bleomycin challenge, as was lung caspase-3 activity. Consistent with these in vivo results, we found that LPA signaling through LPA(1) induced apoptosis in normal human bronchial epithelial cells in culture. LPA-LPA(1) signaling appeared to specifically mediate anoikis, the apoptosis of anchorage-dependent cells induced by their detachment. Similarly, LPA negatively regulated attachment of R3/1 rat alveolar epithelial cell line cells. In contrast, LPA signaling through LPA(1) promoted the resistance of lung fibroblasts to apoptosis, which has also been implicated in IPF. The ability of LPA-LPA(1) signaling to promote epithelial cell apoptosis and fibroblast resistance to apoptosis may therefore contribute to the capacity of this signaling pathway to regulate the development of pulmonary fibrosis after lung injury.
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Affiliation(s)
- Manuela Funke
- Pulmonary and Critical Care Unit, Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, 149 13th Street, Room 8301, Charlestown, MA 02129, USA.
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40
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Zhao J, He D, Su Y, Berdyshev E, Chun J, Natarajan V, Zhao Y. Lysophosphatidic acid receptor 1 modulates lipopolysaccharide-induced inflammation in alveolar epithelial cells and murine lungs. Am J Physiol Lung Cell Mol Physiol 2011; 301:L547-56. [PMID: 21821728 DOI: 10.1152/ajplung.00058.2011] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Lysophosphatidic acid (LPA), a bioactive phospholipid, plays an important role in lung inflammation by inducing the release of chemokines and lipid mediators. Our previous studies have shown that LPA induces the secretion of interleukin-8 and prostaglandin E(2) in lung epithelial cells. Here, we demonstrate that LPA receptors contribute to lipopolysaccharide (LPS)-induced inflammation. Pretreatment with LPA receptor antagonist Ki16425 or downregulation of LPA receptor 1 (LPA(1)) by small-interfering RNA (siRNA) attenuated LPS-induced phosphorylation of p38 MAPK, I-κB kinase, and I-κB in MLE12 epithelial cells. In addition, the blocking of LPA(1) also suppressed LPS-induced IL-6 production. Furthermore, LPS treatment promoted interaction between LPA(1) and CD14, a LPS coreceptor, in a time- and dose-dependent manner. Disruption of lipid rafts attenuated the interaction between LPA(1) and CD14. Mice challenged with LPS increased plasma LPA levels and enhanced expression of LPA receptors in lung tissues. To further investigate the role of LPA receptors in LPS-induced inflammation, wild-type, or LPA(1)-deficient mice, or wild-type mice pretreated with Ki16425 were intratracheally challenged with LPS for 24 h. Knock down or inhibition of LPA(1) decreased LPS-induced IL-6 release in bronchoalveolar lavage (BAL) fluids and infiltration of cells into alveolar space compared with wild-type mice. However, no significant differences in total protein concentration in BAL fluids were observed. These results showed that knock down or inhibition of LPA(1) offered significant protection against LPS-induced lung inflammation but not against pulmonary leak as observed in the murine model for lung injury.
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Affiliation(s)
- Jing Zhao
- Department of Medicine, University of Pittsburgh School of Medicine, PA 15213, USA
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41
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Simultaneous profiling of lysophospholipids and phospholipids from human plasma by nanoflow liquid chromatography-tandem mass spectrometry. Anal Bioanal Chem 2011; 400:2953-61. [DOI: 10.1007/s00216-011-4958-7] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Revised: 03/11/2011] [Accepted: 03/26/2011] [Indexed: 10/18/2022]
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42
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Li H, Zhao Z, Wei G, Yan L, Wang D, Zhang H, Sandusky GE, Turk J, Xu Y. Group VIA phospholipase A2 in both host and tumor cells is involved in ovarian cancer development. FASEB J 2010; 24:4103-16. [PMID: 20530749 PMCID: PMC2996900 DOI: 10.1096/fj.10-161356] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2010] [Accepted: 05/20/2010] [Indexed: 11/11/2022]
Abstract
Host-tumor cell interactions are recognized to be critical in tumor development. We have shown that group VIA phospholipase A(2) [calcium-independent phospholipase A(2)β (iPLA(2)β)] is important in regulating extracellular lysophosphatidic acid (LPA) levels around human epithelial ovarian cancer (EOC) cells. To explore the role of iPLA(2)β in host-tumor cell interactions, we have used immunocompetent iPLA(2)β knockout (iPLA(2)β(-/-)) mice and the mouse EOC cell line ID8. Tumorigenesis and ascites formation were reduced in iPLA(2)β(-/-) mice compared with wild-type (WT) mice by more >50% and were reduced further when ID8 cell iPLA(2)β levels were lowered (by>95%) with shRNA. LPA and lysophosphatidylcholine (LPC) levels in the tumor microenvironment were reduced to ∼80% of WT levels in iPLA(2)β(-/-) mice. LPA, but not LPC, stimulated ID8 cell migration and invasion with cells in which iPLA(2)β expression had been down-regulated in vitro. LPA, but not LPC, also enhanced in vivo ascites formation (by ∼5-fold) and tumorigenesis in iPLA(2)β(-/-) mice. This is the first demonstration of a role for host cell iPLA(2)β in cancer, and these findings suggest that iPLA(2)β is a potential target for developing novel antineoplastic therapeutic strategies.
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Affiliation(s)
- Hui Li
- Department of Obstetrics and Gynecology and
| | | | - Gang Wei
- Department of Obstetrics and Gynecology and
| | - Libo Yan
- Department of Obstetrics and Gynecology and
| | | | - Hong Zhang
- Department of Obstetrics and Gynecology and
- Department of Pathology and Laboratory Medicine, Indiana University, Indianapolis, Indiana, USA
- Department of General Surgery, Second Hospital of Jilin University, Changchun, Jilin, China; and
| | - George Earl Sandusky
- Department of Pathology and Laboratory Medicine, Indiana University, Indianapolis, Indiana, USA
- Department of General Surgery, Second Hospital of Jilin University, Changchun, Jilin, China; and
| | - John Turk
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Yan Xu
- Department of Obstetrics and Gynecology and
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Aaltonen N, Laitinen JT, Lehtonen M. Quantification of lysophosphatidic acids in rat brain tissue by liquid chromatography-electrospray tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:1145-52. [PMID: 20381434 DOI: 10.1016/j.jchromb.2010.03.030] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Revised: 03/11/2010] [Accepted: 03/16/2010] [Indexed: 12/20/2022]
Abstract
Lysophosphatidic acid (LPA) is a lipid mediator with multiple biological functions. A highly selective and sensitive liquid chromatography-tandem mass spectrometry (LC/MS/MS) method was developed for the determination of LPAs (16:0 LPA, 18:0 LPA, 18:1 LPA, 20:4 LPA) in rat brain cryosections. After partitioning the LPAs from other lipophilic material present in the tissue with a liquid-liquid extraction, a reversed-phase column and ion pair technique was used for separating analytes with a gradient elution. An internal standard (17:0 LPA) was included in the analysis. Detection and quantification of the LPAs were carried out with a triple quadrupole mass spectrometer using negative electrospray ionization (ESI) and multiple reaction monitoring (MRM). The artificial formation of LPAs from lysophosphatidylcholines during the sample preparation procedure and instrumentation was carefully studied during the method development. The method was validated; acceptable selectivity, accuracy, precision, recovery, and stability were obtained for concentrations within the calibration curve range of 0.02-1.0muM for LPAs. The quantification limit of the assay was 54fmol injected into column for each LPAs. The method was applied to comparative studies of LPA levels in rat brain cryosections after the various chemical pre-treatments of the sections.
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Affiliation(s)
- Niina Aaltonen
- University of Eastern Finland, Faculty of Health Sciences, School of Pharmacy, Pharmacology and Toxicology, P.O. Box 1627, 70211 Kuopio, Finland.
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Block RC, Duff R, Lawrence P, Kakinami L, Brenna JT, Shearer GC, Meednu N, Mousa S, Friedman A, Harris WS, Larson M, Georas S. The effects of EPA, DHA, and aspirin ingestion on plasma lysophospholipids and autotaxin. Prostaglandins Leukot Essent Fatty Acids 2010; 82:87-95. [PMID: 20106646 PMCID: PMC2926929 DOI: 10.1016/j.plefa.2009.12.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2009] [Revised: 12/18/2009] [Accepted: 12/22/2009] [Indexed: 12/29/2022]
Abstract
Lysophophatidylcholine (LPC) and lysophosphatidic acid (LPA) are potent lysolipid mediators increasingly linked with atherosclerosis and inflammation. A current model proposing that plasma LPA is produced when LPC is hydrolyzed by the enzyme autotaxin has not been rigorously investigated in human subjects. We conducted a clinical trial of eicosapentaenoic acid/docosahexaenoic acid (EPA/DHA) and aspirin ingestion in normal volunteers. Fasting blood samples were drawn at baseline and after 4-week supplementation with EPA/DHA (3.4 g/d) with and without aspirin (650 mg). Plasma LPC and LPA species and autotaxin activity were measured. EPA-LPC and DHA-LPC concentrations increased significantly with EPA/DHA supplementation whereas EPA- and DHA-LPA did not. Autotaxin activity was unaffected by any treatment, and aspirin had no effect on any endpoint. Taken together, our data demonstrate that plasma LPC, but not LPA, species can be dynamically regulated by dietary supplementation, and argue against a simple model of LPA generation via LPC hydrolysis.
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Affiliation(s)
- R C Block
- Department of Community and Preventive Medicine, University of Rochester School of Medicine and Dentistry, Box 644, 601 Elmwood Avenue, Rochester, New York 14642, USA.
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