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El-Banna AA, Ibrahim RS. Metabolic profiling of milk thistle different organs using UPLC-TQD-MS/MS coupled to multivariate analysis in relation to their selective antiviral potential. BMC Complement Med Ther 2024; 24:115. [PMID: 38454377 PMCID: PMC10921647 DOI: 10.1186/s12906-024-04411-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Accepted: 02/26/2024] [Indexed: 03/09/2024] Open
Abstract
INTRODUCTION Silybum marianum commonly known as milk thistle is one of the most imperative medicinal plants due to its remarkable pharmacological activities. Lately, the antiviral activities of S. marianum extract have been studied and it showed effectiveness against many viruses. OBJECTIVE Although most previous studies were concerned mainly with silymarin content of the fruit, the present study provides comprehensive comparative evaluation of S. marianum different organs' chemical profiles using UPLC-MS/MS coupled to chemometrics to unravel potentially selective antiviral compounds against human coronavirus (HCoV-229E). METHODOLOGY UPLC-ESI-TQD-MS/MS analysis was utilized to establish metabolic fingerprints for S. marianum organs namely fruits, roots, stems and seeds. Multivariate analysis, using OPLS-DA and HCA-heat map was applied to explore the main discriminatory phytoconstituents between organs. Selective virucidal activity of organs extracts against coronavirus (HCoV-229E) was evaluated for the first time using cytopathic effect (CPE) inhibition assay. Correlation coefficient analysis was implemented for detection of potential constituents having virucidal activity. RESULTS UPLC-MS/MS analysis resulted in 87 identified metabolites belonging to different classes. OPLS-DA revealed in-between class discrimination between milk thistle organs proving their significantly different metabolic profiles. The results of CPE assay showed that all tested organ samples exhibited dose dependent inhibitory activity in nanomolar range. Correlation analysis disclosed that caffeic acid-O-hexoside, gadoleic and linolenic acids were the most potentially selective antiviral phytoconstituents. CONCLUSION This study valorizes the importance of different S. marianum organs as wealthy sources of selective and effective antiviral candidates. This approach can be extended to unravel potentially active constituents from complex plant matrices.
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Affiliation(s)
- Alaa A El-Banna
- Department of Pharmacognosy, Faculty of Pharmacy, Alexandria University, Alexandria, 21521, Egypt
| | - Reham S Ibrahim
- Department of Pharmacognosy, Faculty of Pharmacy, Alexandria University, Alexandria, 21521, Egypt.
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2
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Wang Z, Yang T, Brenna JT, Wang DH. Fatty acid isomerism: analysis and selected biological functions. Food Funct 2024; 15:1071-1088. [PMID: 38197562 DOI: 10.1039/d3fo03716a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
The biological functions of fatty acids and the lipids in which they are esterified are determined by their chain length, double bond position and geometry and other structural motifs such as the presence of methyl branches. Unusual isomeric features in fatty acids of human foods such as conjugated double bonds or chain branching found in dairy products, some seeds and nuts, and marine foods potentially have important effects on human health. Recent advancements in identifying fatty acids with unusual double bond positions and pinpointing the position of methyl branches have empowered the study of their biological functions. We present recent advances in fatty acid structural elucidation by mass spectrometry in comparison with the more traditional methods. The double bond position can be determined by purely instrumental methods, specifically solvent-mediated covalent adduct chemical ionization (SM-CACI) and ozone induced dissociation (OzID), with charge inversion methods showing promise. Prior derivatization using the Paternò-Büchi (PB) reaction to yield stable structures that, upon collisional activation, yield the double bond position has emerged. The chemical ionization (CI) based three ion monitoring (MRM) method has been developed to simultaneously identify and quantify low-level branched chain fatty acids (BCFAs), unattainable by electron ionization (EI) based methods. Accurate identification and quantification of unusual fatty acid isomers has led to research progress in the discovery of biomarkers for cancer, diabetes, nonalcoholic fatty liver disease (NAFLD) and atherosclerosis. Modulation of eicosanoids, weight loss and the health significance of BCFAs are also presented. This review clearly shows that the improvement of analytical capacity is critical in the study of fatty acid biological functions, and stronger coupling of the methods discussed here with fatty acid mechanistic research is promising in generating more refined outcomes.
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Affiliation(s)
- Zhen Wang
- School of Agriculture, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China.
- School of Public Health (Shenzhen), Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China
| | - Tingxiang Yang
- School of Agriculture, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China.
| | - J Thomas Brenna
- Dell Pediatric Research Institute, Depts of Pediatrics, of Chemistry, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, USA.
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, USA
| | - Dong Hao Wang
- School of Agriculture, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China.
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Menzel JP, Young RSE, Benfield AH, Scott JS, Wongsomboon P, Cudlman L, Cvačka J, Butler LM, Henriques ST, Poad BLJ, Blanksby SJ. Ozone-enabled fatty acid discovery reveals unexpected diversity in the human lipidome. Nat Commun 2023; 14:3940. [PMID: 37402773 DOI: 10.1038/s41467-023-39617-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 06/15/2023] [Indexed: 07/06/2023] Open
Abstract
Fatty acid isomers are responsible for an under-reported lipidome diversity across all kingdoms of life. Isomers of unsaturated fatty acids are often masked in contemporary analysis by incomplete separation and the absence of sufficiently diagnostic methods for structure elucidation. Here, we introduce a comprehensive workflow, to discover unsaturated fatty acids through coupling liquid chromatography and mass spectrometry with gas-phase ozonolysis of double bonds. The workflow encompasses semi-automated data analysis and enables de novo identification in complex media including human plasma, cancer cell lines and vernix caseosa. The targeted analysis including ozonolysis enables structural assignment over a dynamic range of five orders of magnitude, even in instances of incomplete chromatographic separation. Thereby we expand the number of identified plasma fatty acids two-fold, including non-methylene-interrupted fatty acids. Detection, without prior knowledge, allows discovery of non-canonical double bond positions. Changes in relative isomer abundances reflect underlying perturbations in lipid metabolism.
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Affiliation(s)
- Jan Philipp Menzel
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Data Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Institute of Clinical Chemistry, Inselspital, Bern University Hospital, 3010, Bern, Switzerland
| | - Reuben S E Young
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Faculty of Science, Medicine and Health, School of Chemistry and Molecular Bioscience, Wollongong, NSW, Australia
| | - Aurélie H Benfield
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Translational Research Institute, Brisbane, QLD, 4102, Australia
| | - Julia S Scott
- South Australian Immunogenomics Cancer Institute and Freemasons Centre for Male Health and Wellbeing, University of Adelaide, Adelaide, SA, Australia
- South Australian Health and Medical Research Institute, Adelaide, SA, Australia
| | - Puttandon Wongsomboon
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
| | - Lukáš Cudlman
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 542/2, 16600, Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Prague 2, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 542/2, 16600, Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Prague 2, Czech Republic
| | - Lisa M Butler
- South Australian Immunogenomics Cancer Institute and Freemasons Centre for Male Health and Wellbeing, University of Adelaide, Adelaide, SA, Australia
- South Australian Health and Medical Research Institute, Adelaide, SA, Australia
| | - Sónia T Henriques
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Translational Research Institute, Brisbane, QLD, 4102, Australia
| | - Berwyck L J Poad
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia
| | - Stephen J Blanksby
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia.
- Centre for Materials Science, Queensland University of Technology, Brisbane, QLD, 4000, Australia.
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4
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Nutritional lipidomics for the characterization of lipids in food. ADVANCES IN FOOD AND NUTRITION RESEARCH 2023. [PMID: 37516469 DOI: 10.1016/bs.afnr.2022.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Lipids represent one out of three major macronutrient classes in the human diet. It is estimated to account for about 15-20% of the total dietary intake. Triacylglycerides comprise the majority of them, estimated 90-95%. Other lipid classes include free fatty acids, phospholipids, cholesterol, and plant sterols as minor components. Various methods are used for the characterization of nutritional lipids, however, lipidomics approaches become increasingly attractive for this purpose due to their wide coverage, comprehensiveness and holistic view on composition. In this chapter, analytical methodologies and workflows utilized for lipidomics profiling of food samples are outlined with focus on mass spectrometry-based assays. The chapter describes common lipid extraction protocols, the distinct instrumental mass-spectrometry based analytical platforms for data acquisition, chromatographic and ion-mobility spectrometry methods for lipid separation, briefly mentions alternative methods such as gas chromatography for fatty acid profiling and mass spectrometry imaging. Critical issues of important steps of lipidomics workflows such as structural annotation and identification, quantification and quality assurance are discussed as well. Applications reported over the period of the last 5years are summarized covering the discovery of new lipids in foodstuff, differential profiling approaches for comparing samples from different origin, species, varieties, cultivars and breeds, and for food processing quality control. Lipidomics as a powerful tool for personalized nutrition and nutritional intervention studies is briefly discussed as well. It is expected that this field is significantly growing in the near future and this chapter gives a short insight into the power of nutritional lipidomics approaches.
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Dyall SC, Balas L, Bazan NG, Brenna JT, Chiang N, da Costa Souza F, Dalli J, Durand T, Galano JM, Lein PJ, Serhan CN, Taha AY. Polyunsaturated fatty acids and fatty acid-derived lipid mediators: Recent advances in the understanding of their biosynthesis, structures, and functions. Prog Lipid Res 2022; 86:101165. [PMID: 35508275 PMCID: PMC9346631 DOI: 10.1016/j.plipres.2022.101165] [Citation(s) in RCA: 159] [Impact Index Per Article: 79.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/26/2022] [Accepted: 04/27/2022] [Indexed: 12/21/2022]
Abstract
Polyunsaturated fatty acids (PUFAs) are structural components of membrane phospholipids, and influence cellular function via effects on membrane properties, and also by acting as a precursor pool for lipid mediators. These lipid mediators are formed via activation of pathways involving at least one step of dioxygen-dependent oxidation, and are consequently called oxylipins. Their biosynthesis can be either enzymatically-dependent, utilising the promiscuous cyclooxygenase, lipoxygenase, or cytochrome P450 mixed function oxidase pathways, or nonenzymatic via free radical-catalyzed pathways. The oxylipins include the classical eicosanoids, comprising prostaglandins, thromboxanes, and leukotrienes, and also more recently identified lipid mediators. With the advent of new technologies there is growing interest in identifying these different lipid mediators and characterising their roles in health and disease. This review brings together contributions from some of those at the forefront of research into lipid mediators, who provide brief introductions and summaries of current understanding of the structure and functions of the main classes of nonclassical oxylipins. The topics covered include omega-3 and omega-6 PUFA biosynthesis pathways, focusing on the roles of the different fatty acid desaturase enzymes, oxidized linoleic acid metabolites, omega-3 PUFA-derived specialized pro-resolving mediators, elovanoids, nonenzymatically oxidized PUFAs, and fatty acid esters of hydroxy fatty acids.
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Kawai T, Matsumori N, Otsuka K. Recent advances in microscale separation techniques for lipidome analysis. Analyst 2021; 146:7418-7430. [PMID: 34787600 DOI: 10.1039/d1an00967b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This review paper highlights the recent research on liquid-phase microscale separation techniques for lipidome analysis over the last 10 years, mainly focusing on capillary liquid chromatography (LC) and capillary electrophoresis (CE) coupled with mass spectrometry (MS). Lipids are one of the most important classes of biomolecules which are involved in the cell membrane, energy storage, signal transduction, and so on. Since lipids include a variety of hydrophobic compounds including numerous structural isomers, lipidomes are a challenging target in bioanalytical chemistry. MS is the key technology that comprehensively identifies lipids; however, separation techniques like LC and CE are necessary prior to MS detection in order to avoid ionization suppression and resolve structural isomers. Separation techniques using μm-scale columns, such as a fused silica capillary and microfluidic device, are effective at realizing high-resolution separation. Microscale separation usually employs a nL-scale flow, which is also compatible with nanoelectrospray ionization-MS that achieves high sensitivity. Owing to such analytical advantages, microscale separation techniques like capillary/microchip LC and CE have been employed for more than 100 lipidome studies. Such techniques are still being evolved and achieving further higher resolution and wider coverage of lipidomes. Therefore, microscale separation techniques are promising as the fundamental technology in next-generation lipidome analysis.
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Affiliation(s)
- Takayuki Kawai
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
| | - Nobuaki Matsumori
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
| | - Koji Otsuka
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
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Fernandez RF, Pereyra AS, Diaz V, Wilson ES, Litwa KA, Martínez-Gardeazabal J, Jackson SN, Brenna JT, Hermann BP, Eells JB, Ellis JM. Acyl-CoA synthetase 6 is required for brain docosahexaenoic acid retention and neuroprotection during aging. JCI Insight 2021; 6:e144351. [PMID: 34100386 PMCID: PMC8262339 DOI: 10.1172/jci.insight.144351] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 04/23/2021] [Indexed: 12/27/2022] Open
Abstract
The omega-3 fatty acid docosahexaenoic acid (DHA) inversely relates to neurological impairments with aging; however, limited nondietary models manipulating brain DHA have hindered a direct linkage. We discovered that loss of long-chain acyl-CoA synthetase 6 in mice (Acsl6–/–) depletes brain membrane phospholipid DHA levels, independent of diet. Here, Acsl6–/– brains contained lower DHA compared with controls across the life span. The loss of DHA- and increased arachidonate-enriched phospholipids were visualized by MALDI imaging predominantly in neuron-rich regions where single-molecule RNA in situ hybridization localized Acsl6 to neurons. ACSL6 is also astrocytic; however, we found that astrocyte-specific ACSL6 depletion did not alter membrane DHA because astrocytes express a non–DHA-preferring ACSL6 variant. Across the life span, Acsl6–/– mice exhibited hyperlocomotion, impairments in working spatial memory, and increased cholesterol biosynthesis genes. Aging caused Acsl6–/– brains to decrease the expression of membrane, bioenergetic, ribosomal, and synaptic genes and increase the expression of immune response genes. With age, the Acsl6–/– cerebellum became inflamed and gliotic. Together, our findings suggest that ACSL6 promotes membrane DHA enrichment in neurons, but not in astrocytes, and is important for neuronal DHA levels across the life span. The loss of ACSL6 impacts motor function, memory, and age-related neuroinflammation, reflecting the importance of neuronal ACSL6-mediated lipid metabolism across the life span.
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Affiliation(s)
- Regina F Fernandez
- Department of Physiology, Brody School of Medicine, and East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina, USA
| | - Andrea S Pereyra
- Department of Physiology, Brody School of Medicine, and East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina, USA
| | - Victoria Diaz
- Department of Biology, University of Texas San Antonio, San Antonio, Texas, USA
| | - Emily S Wilson
- Department of Anatomy and Cell Biology, Brody School of Medicine, East Carolina University, Greenville, North Carolina, USA
| | - Karen A Litwa
- Department of Anatomy and Cell Biology, Brody School of Medicine, East Carolina University, Greenville, North Carolina, USA
| | | | - Shelley N Jackson
- Structural Biology Core, Intramural Research Program, National Institute on Drug Abuse, NIH, Baltimore, Maryland, USA
| | - J Thomas Brenna
- Departments of Pediatrics, Chemistry, and Nutrition and.,Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin, Austin, Texas, USA
| | - Brian P Hermann
- Department of Biology, University of Texas San Antonio, San Antonio, Texas, USA
| | - Jeffrey B Eells
- Department of Anatomy and Cell Biology, Brody School of Medicine, East Carolina University, Greenville, North Carolina, USA
| | - Jessica M Ellis
- Department of Physiology, Brody School of Medicine, and East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina, USA
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8
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Yamamoto S, Kato S, Senoo N, Miyoshi N, Morita A, Miura S. Differences in phosphatidylcholine profiles and identification of characteristic phosphatidylcholine molecules in meat animal species and meat cut locations. Biosci Biotechnol Biochem 2021; 85:1205-1214. [PMID: 33686423 DOI: 10.1093/bbb/zbab010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 01/12/2021] [Indexed: 11/14/2022]
Abstract
Phosphatidylcholine (PC) is an essential component of the plasma membrane. Its profile varies with species and tissues. However, the PC profiles in meat have not been explored in depth. This study aimed to investigate the differences in PC profiles between various meat animal species and meat cut sites, along with the identification of characteristic PC molecules. The results demonstrated that the PC profiles of chicken meat differed from those of other species. Significant differences were also observed between the PC profiles of pork meat and the meat obtained from other species. The amount of PCs containing ether bonds was high in pork meat. PCs containing an odd number of carbon atoms were characteristic of beef and lamb meats. Furthermore, PC profiles differed based on the muscle location in chicken and pork. These results suggest that the PC profiles of skeletal muscles are indicators of animal species and muscle location.
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Affiliation(s)
- Shunsuke Yamamoto
- Laboratory of Nutritional Biochemistry, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan.,Research and Development Department, Prima Meat Packers, Ltd., Tsuchiura, Japan
| | - Shigeki Kato
- Research and Development Department, Prima Meat Packers, Ltd., Tsuchiura, Japan
| | - Nanami Senoo
- Laboratory of Nutritional Biochemistry, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan.,Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Noriyuki Miyoshi
- Laboratory of Biochemistry, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan
| | - Akihito Morita
- Laboratory of Nutritional Biochemistry, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan
| | - Shinji Miura
- Laboratory of Nutritional Biochemistry, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan
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9
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Liu XM, Zhang Y, Zhou Y, Li GH, Zeng BQ, Zhang JW, Feng XS. Progress in Pretreatment and Analysis of Fatty Acids in Foods: An Update since 2012. SEPARATION & PURIFICATION REVIEWS 2021. [DOI: 10.1080/15422119.2019.1673776] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Xiao-Min Liu
- School of Pharmacy, China Medical University, Shenyang, China
| | - Yuan Zhang
- Department of Pharmacy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yu Zhou
- Department of Pharmacy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Guo-Hui Li
- Department of Pharmacy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Ben-Qing Zeng
- Department of Pharmacy, The First People’s Hospital of Longquanyi District, Chengdu, China
| | - Jian-Wei Zhang
- Department of Abdominal Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xue-Song Feng
- School of Pharmacy, China Medical University, Shenyang, China
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10
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Wang DH, Wang Z, Chen R, Brenna JT. Characterization and Semiquantitative Analysis of Novel Ultratrace C 10-24 Monounsaturated Fatty Acid in Bovine Milkfat by Solvent-Mediated Covalent Adduct Chemical Ionization (CACI) MS/MS. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:7482-7489. [PMID: 32608227 DOI: 10.1021/acs.jafc.0c03031] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The net action of ruminal bacteria and endogenous bovine enzymes are responsible for cow's milk having the most complex fatty acid profiles among common foods. About 40 monounsaturated fatty acids below 1.5% w/w are known. Analysis of trace and ultratrace fatty acids is a challenge to the highest resolution chromatography even with prior fractionation. We employ solvent-mediated covalent adduct chemical ionization (CACI) tandem mass spectrometry (MS/MS) to enable rapid, unambiguous identification of unsaturated fatty acid methyl esters (FAME) at high sensitivity. Fifty-four monounsaturated fatty acids (C10-24) were completely characterized, with the discovery of 15 novel fatty acids including nine at ultratrace levels 10-100 ppm, g/106 g fatty acids (lowest concentration 19:1n-6 (10 ± 11 ppm, w/w (0.001%, w/w))). Ultratrace monoenes were typically odd chain lengths and all analyzed in a single 20 min analysis. These data establish the abundance of 15 new monoene fatty acids in bovine milkfat and a strategy for rapid unambiguous analysis of ultratrace monounsaturated fatty acids.
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Affiliation(s)
- Dong Hao Wang
- Dell Pediatric Research Institute, Departments of Pediatrics, of Chemistry, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, Texas 78723, United States
- Department of Food Science, Cornell University, Ithaca, New York 14850, United States
| | - Zhen Wang
- Dell Pediatric Research Institute, Departments of Pediatrics, of Chemistry, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, Texas 78723, United States
- Department of Food Science, Cornell University, Ithaca, New York 14850, United States
| | - Raymond Chen
- Dell Pediatric Research Institute, Departments of Pediatrics, of Chemistry, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, Texas 78723, United States
| | - J Thomas Brenna
- Dell Pediatric Research Institute, Departments of Pediatrics, of Chemistry, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, Texas 78723, United States
- Department of Food Science, Cornell University, Ithaca, New York 14850, United States
- Division of Nutritional Sciences, Cornell University, Ithaca, New York14850, United States
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11
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Davinelli S, Intrieri M, Corbi G, Scapagnini G. Metabolic indices of polyunsaturated fatty acids: current evidence, research controversies, and clinical utility. Crit Rev Food Sci Nutr 2020; 61:259-274. [PMID: 32056443 DOI: 10.1080/10408398.2020.1724871] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The n-3 and n-6 polyunsaturated fatty acids (PUFA) are among the most studied nutrients in human metabolism. In the past few decades, prospective studies and controlled trials have supported the view that the effects of these essential fatty acids are clinically relevant. PUFA profiles in different blood compartments are reflections of both diet and metabolism, and their levels may be related to disease risk. Despite widespread interest, there is no consensus regarding which biomarkers best reflect PUFA status in the body. The measurement of PUFA levels is not straight-forward, and a wide variety of indices have been used in clinical studies, producing conflicting results. A major source of heterogeneity among studies is associated with research design, sampling, and laboratory analyses. To date, the n-3 index, n-6/n-3 ratio, and arachidonic acid (AA)/eicosapentaenoic acid (EPA) ratio are the most promising biomarkers associated with PUFA metabolism. Although hotly debated, these indices may be considered at least markers, if not risk factors, for several diseases, especially cardiovascular events and brain disorders. Here, we summarize the most updated evidence of n-3 and n-6 PUFA effects on human health, reviewing current controversies on the aforementioned indices and whether they can be considered valuable predictors of clinical outcomes.
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Affiliation(s)
- Sergio Davinelli
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, Campobasso, Italy
| | - Mariano Intrieri
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, Campobasso, Italy
| | - Graziamaria Corbi
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, Campobasso, Italy
| | - Giovanni Scapagnini
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, Campobasso, Italy
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12
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Hale BJ, Fernandez RF, Kim SQ, Diaz VD, Jackson SN, Liu L, Brenna JT, Hermann BP, Geyer CB, Ellis JM. Acyl-CoA synthetase 6 enriches seminiferous tubules with the ω-3 fatty acid docosahexaenoic acid and is required for male fertility in the mouse. J Biol Chem 2019; 294:14394-14405. [PMID: 31399511 PMCID: PMC6768642 DOI: 10.1074/jbc.ra119.009972] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 07/01/2019] [Indexed: 12/31/2022] Open
Abstract
Docosahexaenoic acid (DHA) is an ω-3 dietary-derived polyunsaturated fatty acid of marine origin enriched in testes and necessary for normal fertility, yet the mechanisms regulating the enrichment of DHA in the testes remain unclear. Long-chain ACSL6 (acyl-CoA synthetase isoform 6) activates fatty acids for cellular anabolic and catabolic metabolism by ligating a CoA to a fatty acid, is highly expressed in testes, and has high preference for DHA. Here, we investigated the role of ACSL6 for DHA enrichment in the testes and its requirement for male fertility. Acsl6-/- males were severely subfertile with smaller testes, reduced cauda epididymal sperm counts, germ cell loss, and disorganization of the seminiferous epithelium. Total fatty acid profiling of Acsl6-/- testes revealed reduced DHA and increased ω-6 arachidonic acid, a fatty acid profile also reflected in phospholipid composition. Strikingly, lipid imaging demonstrated spatial redistribution of phospholipids in Acsl6-/- testes. Arachidonic acid-containing phospholipids were predominantly interstitial in control testes but diffusely localized across Acsl6-/- testes. In control testes, DHA-containing phospholipids were predominantly within seminiferous tubules, which contain Sertoli cells and spermatogenic cells but relocalized to the interstitium in Acsl6-/- testes. Taken together, these data demonstrate that ACSL6 is an initial driving force for germ cell DHA enrichment and is required for normal spermatogenesis and male fertility.
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Affiliation(s)
- Benjamin J Hale
- Department of Anatomy and Cell Biology, Brody School of Medicine, East Carolina University, Greenville, North Carolina 27834
| | - Regina F Fernandez
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, North Carolina 27834
| | - Sora Q Kim
- Department of Nutrition Science, Purdue University, West Lafayette, Indiana 47907
| | - Victoria D Diaz
- Department of Biology, University of Texas at San Antonio, San Antonio, Texas 78249
| | - Shelley N Jackson
- National Institute on Drug Abuse, Intramural Research Program, Structural Biology Core, Baltimore, Maryland 21224
| | - Lei Liu
- Departments of Pediatrics, Chemistry, and Nutrition, Dell Pediatric Research Institute, University of Texas at Austin, Austin, Texas 78723
- Department of Veterinary Sciences, Hunan Agricultural University, Changsha 410128, China
| | - J Thomas Brenna
- Departments of Pediatrics, Chemistry, and Nutrition, Dell Pediatric Research Institute, University of Texas at Austin, Austin, Texas 78723
| | - Brian P Hermann
- Department of Biology, University of Texas at San Antonio, San Antonio, Texas 78249
| | - Christopher B Geyer
- Department of Anatomy and Cell Biology, Brody School of Medicine, East Carolina University, Greenville, North Carolina 27834
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina 27834
| | - Jessica M Ellis
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, North Carolina 27834
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina 27834
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13
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Liu R, Cheng M, Kothapalli KSD, Wang Z, Mendralla E, Park HG, Block RC, Wang X, Brenna JT. Glycerol derived process contaminants in refined coconut oil induce cholesterol synthesis in HepG2 cells. Food Chem Toxicol 2019; 127:135-142. [PMID: 30878531 PMCID: PMC6467815 DOI: 10.1016/j.fct.2019.03.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 03/05/2019] [Accepted: 03/07/2019] [Indexed: 10/27/2022]
Abstract
Despite its 50-year history, the conventional diet-heart hypothesis holding that dietary saturated fats raise serum cholesterol, and with it, cardiovascular risk, remains controversial. Harsh chemical and physical treatment generates process contaminants, and refined oils raise serum and tissue cholesterol in vivo independent of saturated fat content. We developed an in vitro bioassay for rapidly assessing the influence of oils on cholesterol metabolism in the human liver HepG2 cell line, and tested it using coconut oil (CO) of various stages of refinement. CO was dissolved with dipalmitoyl phosphatidylcholine (DPPC) surfactant, solvent evaporated, and emulsified into fat-free cell culture media. After 24 h treatment cellular cholesterol and triacylglycerol increased; HMG-CoA Reductase (HMGCR) increased and CYP7A1 (cholesterol 7α-hydroxylase) decreased with sequential processing steps, deacidification, bleaching, deodorization, while fatty acid profiles were not affected. Glycerol-derived process contaminants glycidyl esters and monochloropropandiol (MCPD) increased with processing. Addition of glycidyl or MCPD to virgin CO (VCO) had similar effects to processing, while addition of phenolic antioxidants to fully refined CO reduced HMGCR and increased CYP7A1. We conclude that harsh processing creates contaminants that raise cholesterol levels in vitro, consistent with a role as a contributing atherosclerotic factor.
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Affiliation(s)
- Ruijie Liu
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Synergetic Innovation Center of Food Safety and Nutrition of Jiangsu Province, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA
| | - Min Cheng
- Synergetic Innovation Center of Food Safety and Nutrition of Jiangsu Province, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China
| | - Kumar S D Kothapalli
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA
| | - Zhen Wang
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA
| | - Elizabeth Mendralla
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA
| | - Hui Gyu Park
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA
| | - Robert C Block
- Department of Community and Preventive Medicine and Cardiology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Saunders Research Building, Rochester, NY, 14642, USA
| | - Xingguo Wang
- Synergetic Innovation Center of Food Safety and Nutrition of Jiangsu Province, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China
| | - J Thomas Brenna
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA.
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14
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Monakhova YB, Zailer E, Diehl BWK. Quality Control of Krill Oil by Nuclear Magnetic Resonance (NMR) Spectroscopy: Composition and Detection of Foreign Species. ANAL LETT 2018. [DOI: 10.1080/00032719.2018.1440402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Yulia B. Monakhova
- Spectral Service AG, Cologne, Germany
- Institute of Chemistry, Saratov State University, Saratov, Russia
- Institute of Chemistry, Saint Petersburg State University, St Petersburg, Russia
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15
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Brenna JT, Plourde M, Stark KD, Jones PJ, Lin YH. Best practices for the design, laboratory analysis, and reporting of trials involving fatty acids. Am J Clin Nutr 2018; 108:211-227. [PMID: 29931035 PMCID: PMC6084616 DOI: 10.1093/ajcn/nqy089] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 04/09/2018] [Indexed: 12/13/2022] Open
Abstract
Fatty acids are among the most studied nutrients in human metabolism and health. Endogenous fatty acid status influences health and disease via multiple mechanisms at all stages of the life cycle. Despite widespread interest, attempts to summarize the results of multiple studies addressing similar fatty acid-related outcomes via meta-analyses and systematic reviews have been disappointing, largely because of heterogeneity in study design, sampling, and laboratory and data analyses. Our purpose is to recommend best practices for fatty acid clinical nutrition and medical studies. Key issues in study design include judicious choice of sampled endogenous pools for fatty acid analysis, considering relevant physiologic state, duration of intervention and/or observation, consideration of specific fatty acid dynamics to link intake and endogenous concentrations, and interpretation of results with respect to known fatty acid ranges. Key laboratory considerations include proper sample storage, use of sample preparation methods known to be fit-for-purpose via published validation studies, detailed reporting or methods to establish proper fatty acid identification, and quantitative analysis, including calibration of differential response, quality control procedures, and reporting of data on a minimal set of fatty acids to enable comprehensive interpretation. We present a checklist of recommendations for fatty acid best practices to facilitate design, review, and evaluation of studies with the intention of improving study reproducibility.
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Affiliation(s)
- J Thomas Brenna
- Dell Pediatric Research Institute, Departments of Pediatrics, Nutrition, and Chemistry, University of Texas at Austin, Austin, TX.,Division of Nutritional Sciences and Department of Food Science, Cornell University, Ithaca, NY
| | - Mélanie Plourde
- Research Center on Aging, Department of Medicine, Université de Sherbrooke, Sherbrooke, Canada
| | - Ken D Stark
- Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada
| | - Peter J Jones
- Richardson Center for Functional Foods and Nutraceuticals, University of Manitoba, Winnipeg, Canada
| | - Yu-Hong Lin
- Division of Intramural Clinical and Biological Research, NIAAA, NIH, Bethesda, MD
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16
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Schulze C, Merdivan S, Felten L, Mundt S. Quantification of Fatty Acid Methyl Esters in Various Biological Matrices by LC-DAD and LC-MS after One-Step Transesterification. FOOD ANAL METHOD 2018. [DOI: 10.1007/s12161-018-1184-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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17
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Zhao Y, Zhao H, Zhao X, Jia J, Ma Q, Zhang S, Zhang X, Chiba H, Hui SP, Ma X. Identification and Quantitation of C═C Location Isomers of Unsaturated Fatty Acids by Epoxidation Reaction and Tandem Mass Spectrometry. Anal Chem 2017; 89:10270-10278. [PMID: 28837768 DOI: 10.1021/acs.analchem.7b01870] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Yaoyao Zhao
- Graduate
School of Health Science, Hokkaido University, North 12, West 5, Kita-ku, Sapporo 060-0812, Japan
| | - Hansen Zhao
- Department
of Chemistry, Tsinghua University, Beijing 100084, P.R. China
| | - Xu Zhao
- Department
of Chemistry, Tsinghua University, Beijing 100084, P.R. China
| | - Jia Jia
- Department
of Chemistry, Tsinghua University, Beijing 100084, P.R. China
| | - Qiang Ma
- Chinese Academy of Inspection and Quarantine, Beijing 100176, China
| | - Sichun Zhang
- Department
of Chemistry, Tsinghua University, Beijing 100084, P.R. China
| | - Xinrong Zhang
- Department
of Chemistry, Tsinghua University, Beijing 100084, P.R. China
| | - Hitoshi Chiba
- Graduate
School of Health Science, Hokkaido University, North 12, West 5, Kita-ku, Sapporo 060-0812, Japan
| | - Shu-Ping Hui
- Graduate
School of Health Science, Hokkaido University, North 12, West 5, Kita-ku, Sapporo 060-0812, Japan
| | - Xiaoxiao Ma
- Department
of Precision Instruments, Tsinghua University, Beijing 100084, P.R. China
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18
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Cordes T, Metallo CM. Tracing insights into human metabolism using chemical engineering approaches. Curr Opin Chem Eng 2016; 14:72-81. [PMID: 28480159 DOI: 10.1016/j.coche.2016.08.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Metabolism coordinates the conversion of available nutrients toward energy, biosynthetic intermediates, and signaling molecules to mediate virtually all biological functions. Dysregulation of metabolic pathways contributes to many diseases, so a detailed understanding of human metabolism has significant therapeutic implications. Over the last decade major technological advances in the areas of analytical chemistry, computational estimation of intracellular fluxes, and biological engineering have improved our ability to observe and engineer metabolic pathways. These approaches are reminiscent of the design, operation, and control of industrial chemical plants. Immune cells have emerged as an intriguing system in which metabolism influences diverse biological functions. Application of metabolic flux analysis and related approaches to macrophages and T cells offers great therapeutic opportunities to biochemical engineers.
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Affiliation(s)
- Thekla Cordes
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Christian M Metallo
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA.,Institute of Engineering in Medicine, University of California, San Diego, La Jolla, CA 92093, USA
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19
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Stark KD, Van Elswyk ME, Higgins MR, Weatherford CA, Salem N. Global survey of the omega-3 fatty acids, docosahexaenoic acid and eicosapentaenoic acid in the blood stream of healthy adults. Prog Lipid Res 2016; 63:132-52. [PMID: 27216485 DOI: 10.1016/j.plipres.2016.05.001] [Citation(s) in RCA: 333] [Impact Index Per Article: 41.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 05/14/2016] [Accepted: 05/18/2016] [Indexed: 02/05/2023]
Abstract
Studies reporting blood levels of the omega-3 polyunsaturated fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), were systematically identified in order to create a global map identifying countries and regions with different blood levels. Included studies were those of healthy adults, published in 1980 or later. A total of 298 studies met all inclusion criteria. Studies reported fatty acids in various blood fractions including plasma total lipids (33%), plasma phospholipid (32%), erythrocytes (32%) and whole blood (3.0%). Fatty acid data from each blood fraction were converted to relative weight percentages (wt.%) and then assigned to one of four discrete ranges (high, moderate, low, very low) corresponding to wt.% EPA+DHA in erythrocyte equivalents. Regions with high EPA+DHA blood levels (>8%) included the Sea of Japan, Scandinavia, and areas with indigenous populations or populations not fully adapted to Westernized food habits. Very low blood levels (≤4%) were observed in North America, Central and South America, Europe, the Middle East, Southeast Asia, and Africa. The present review reveals considerable variability in blood levels of EPA+DHA and the very low to low range of blood EPA+DHA for most of the world may increase global risk for chronic disease.
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Affiliation(s)
- Ken D Stark
- University of Waterloo, Department of Kinesiology, 200 University Avenue, Waterloo, ON, N2L 3G1, Canada.
| | - Mary E Van Elswyk
- Scientific Affairs, Van Elswyk Consulting, Inc., 10350 Macedonia St., Longmont, CO 80503, USA.
| | - M Roberta Higgins
- MEDetect Clinical Information Associates, Inc., PO Box 152, Skippack, PA 19474, USA.
| | | | - Norman Salem
- DSM Nutritional Products Ltd., 6480 Dobbin Road, Columbia, MD 21045, USA.
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20
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Mudgal S, Ran-Ressler RR, Liu L, Brenna JT, Rizvi SSH. Branched chain fatty acids concentrate prepared from butter oil via urea adduction. EUR J LIPID SCI TECH 2015. [DOI: 10.1002/ejlt.201500110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Samriddh Mudgal
- Institute of Food Science; Cornell University, Ithaca, NY; USA
| | | | - Lei Liu
- Institute of Food Science; Cornell University, Ithaca, NY; USA
- Division of Nutritional Sciences; Cornell University, Ithaca, NY; USA
| | - J. Thomas Brenna
- Institute of Food Science; Cornell University, Ithaca, NY; USA
- Division of Nutritional Sciences; Cornell University, Ithaca, NY; USA
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21
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Park HG, Park WJ, Kothapalli KSD, Brenna JT. The fatty acid desaturase 2 (FADS2) gene product catalyzes Δ4 desaturation to yield n-3 docosahexaenoic acid and n-6 docosapentaenoic acid in human cells. FASEB J 2015; 29:3911-9. [PMID: 26065859 DOI: 10.1096/fj.15-271783] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 05/26/2015] [Indexed: 11/11/2022]
Abstract
Docosahexaenoic acid (DHA) is a Δ4-desaturated C22 fatty acid and the limiting highly unsaturated fatty acid (HUFA) in neural tissue. The biosynthesis of Δ4-desaturated docosanoid fatty acids 22:6n-3 and 22:5n-6 are believed to proceed via a circuitous biochemical pathway requiring repeated use of a fatty acid desaturase 2 (FADS2) protein to perform Δ6 desaturation on C24 fatty acids in the endoplasmic reticulum followed by 1 round of β-oxidation in the peroxisomes. We demonstrate here that the FADS2 gene product can directly Δ4-desaturate 22:5n-3→22:6n-3 (DHA) and 22:4n-6→22:5n-6. Human MCF-7 cells lacking functional FADS2-mediated Δ6-desaturase were stably transformed with FADS2, FADS1, or empty vector. When incubated with 22:5n-3 or 22:4n-6, FADS2 stable cells produce 22:6n-3 or 22:5n-6, respectively. Similarly, FADS2 stable cells when incubated with d5-18:3n-3 show synthesis of d5-22:6n-3 with no labeling of 24:5n-3 or 24:6n-3 at 24 h. Further, both C24 fatty acids are shown to be products of the respective C22 fatty acids via elongation. Our results demonstrate that the FADS2 classical transcript mediates direct Δ4 desaturation to yield 22:6n-3 and 22:5n-6 in human cells, as has been widely shown previously for desaturation by fish and many other organisms.
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Affiliation(s)
- Hui Gyu Park
- *Division of Nutritional Sciences and Department of Food Science, Cornell University, Ithaca, New York, USA; and Department of Marine Food Science and Technology, Gangneung-Wonju National University, South Korea
| | - Woo Jung Park
- *Division of Nutritional Sciences and Department of Food Science, Cornell University, Ithaca, New York, USA; and Department of Marine Food Science and Technology, Gangneung-Wonju National University, South Korea
| | - Kumar S D Kothapalli
- *Division of Nutritional Sciences and Department of Food Science, Cornell University, Ithaca, New York, USA; and Department of Marine Food Science and Technology, Gangneung-Wonju National University, South Korea
| | - J Thomas Brenna
- *Division of Nutritional Sciences and Department of Food Science, Cornell University, Ithaca, New York, USA; and Department of Marine Food Science and Technology, Gangneung-Wonju National University, South Korea
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