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Reinicke M, Dorow J, Bischof K, Leyh J, Bechmann I, Ceglarek U. Tissue pretreatment for LC-MS/MS analysis of PUFA and eicosanoid distribution in mouse brain and liver. Anal Bioanal Chem 2020; 412:2211-2223. [PMID: 31865417 PMCID: PMC7118053 DOI: 10.1007/s00216-019-02170-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 09/16/2019] [Accepted: 09/24/2019] [Indexed: 12/20/2022]
Abstract
Polyunsaturated fatty acids (PUFAs) and eicosanoids are important mediators of inflammation. The functional role of eicosanoids in metabolic-syndrome-related diseases has been extensively studied. However, their role in neuroinflammation and the development of neurodegenerative diseases is still unclear. The aim of this study was the development of a sample pretreatment protocol for the simultaneous analysis of PUFAs and eicosanoids in mouse liver and brain. Liver and brain samples of male wild-type C57BL/6J mice (11-122 mg) were used to investigate conditions for tissue rinsing, homogenization, extraction, and storage. A targeted liquid chromatography-negative electrospray ionization tandem mass spectrometry method was applied to quantify 7 PUFAs and 94 eicosanoids. The final pretreatment protocol consisted of a 5-min homogenization step by sonication in 650 μL n-hexane/2-propanol (60:40 v/v) containing 2,6-di-tert-butyl-4-methylphenol at 50 μg/mL. Homogenates representing 1 mg tissue were extracted in a single step with n-hexane/2-propanol (60:40 v/v) containing 0.1% formic acid. Autoxidation was prevented by addition of 2,6-di-tert-butyl-4-methylphenol at 50 μg/mL and keeping the samples at 4 °C during sample preparation. Extracts were dried under nitrogen and reconstituted in liquid chromatography eluent before analysis. Recovery was determined to range from 45% to 149% for both liver and brain tissue. Within-run and between-run variability ranged between 7% and 18% for PUFAs and between 1% and 24% for eicosanoids. In liver, 7 PUFAs and 15 eicosanoids were quantified; in brain, 6 PUFAs and 21 eicosanoids had significant differences within the brain substructures. In conclusion, a robust and reproducible sample preparation protocol for the multiplexed analysis of PUFAs and eicosanoids by liquid chromatography-tandem mass spectrometry in liver and discrete brain substructures was developed.
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Affiliation(s)
- Madlen Reinicke
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig University, Liebigstr. 27, 04103, Leipzig, Germany.
| | - Juliane Dorow
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig University, Liebigstr. 27, 04103, Leipzig, Germany
| | - Karoline Bischof
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig University, Liebigstr. 27, 04103, Leipzig, Germany
| | - Judith Leyh
- Institute of Anatomy, Leipzig University, Liebigstr. 13, 04103, Leipzig, Germany
| | - Ingo Bechmann
- Institute of Anatomy, Leipzig University, Liebigstr. 13, 04103, Leipzig, Germany
| | - Uta Ceglarek
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig University, Liebigstr. 27, 04103, Leipzig, Germany
- LIFE - Leipzig Research Center for Civilization Diseases, Leipzig University, Philipp-Rosenthal-Str. 27, 04103, Leipzig, Germany
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Ostermann AI, Waindok P, Schmidt MJ, Chiu CY, Smyl C, Rohwer N, Weylandt KH, Schebb NH. Modulation of the endogenous omega-3 fatty acid and oxylipin profile in vivo-A comparison of the fat-1 transgenic mouse with C57BL/6 wildtype mice on an omega-3 fatty acid enriched diet. PLoS One 2017; 12:e0184470. [PMID: 28886129 PMCID: PMC5590967 DOI: 10.1371/journal.pone.0184470] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 08/24/2017] [Indexed: 12/21/2022] Open
Abstract
Dietary intervention and genetic fat-1 mice are two models for the investigation of effects associated with omega-3 polyunsaturated fatty acids (n3-PUFA). In order to assess their power to modulate the fatty acid and oxylipin pattern, we thoroughly compared fat-1 and wild-type C57BL/6 mice on a sunflower oil diet with wild-type mice on the same diet enriched with 1% EPA and 1% DHA for 0, 7, 14, 30 and 45 days. Feeding led after 14–30 days to a high steady state of n3-PUFA in all tissues at the expense of n6-PUFAs. Levels of n3-PUFA achieved by feeding were higher compared to fat-1 mice, particularly for EPA (max. 1.7% in whole blood of fat-1 vs. 7.8% following feeding). Changes in PUFAs were reflected in most oxylipins in plasma, brain and colon: Compared to wild-type mice on a standard diet, arachidonic acid metabolites were overall decreased while EPA and DHA oxylipins increased with feeding more than in fat-1 mice. In plasma of n3-PUFA fed animals, EPA and DHA metabolites from the lipoxygenase and cytochrome P450 pathways dominated over ARA derived counterparts.Fat-1 mice show n3-PUFA level which can be reached by dietary interventions, supporting the applicability of this model in n3-PUFA research. However, for specific questions, e.g. the role of EPA derived mediators or concentration dependent effects of (individual) PUFA, feeding studies are necessary.
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Affiliation(s)
- Annika I. Ostermann
- Institute for Food Toxicology, University of Veterinary Medicine Hannover, Hannover, Germany
- Food Chemistry, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Wuppertal, Germany
| | - Patrick Waindok
- Institute for Food Toxicology, University of Veterinary Medicine Hannover, Hannover, Germany
- Institute for Parasitology, Centre for Infection Medicine, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Moritz J. Schmidt
- Institute for Food Toxicology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Cheng-Ying Chiu
- Medical Department, Division of Hepatology and Gastroenterology (including Metabolic Diseases), Charité University Medicine Berlin, Campus Virchow Klinikum, Berlin, Germany
| | - Christopher Smyl
- Medical Department, Division of Hepatology and Gastroenterology (including Metabolic Diseases), Charité University Medicine Berlin, Campus Virchow Klinikum, Berlin, Germany
| | - Nadine Rohwer
- Medical Department, Division of Hepatology and Gastroenterology (including Metabolic Diseases), Charité University Medicine Berlin, Campus Virchow Klinikum, Berlin, Germany
| | - Karsten-H. Weylandt
- Medical Department, Division of Hepatology and Gastroenterology (including Metabolic Diseases), Charité University Medicine Berlin, Campus Virchow Klinikum, Berlin, Germany
- Experimental and Clinical Research Centre, Charité University Medicine, Campus Buch, Berlin, Germany
- Medical Department, Division of Gastroenterology, Oncology, Hematology, Rheumatology and Diabetes, Ruppiner Kliniken, Brandenburg Medical School, Neuruppin, Germany
| | - Nils Helge Schebb
- Institute for Food Toxicology, University of Veterinary Medicine Hannover, Hannover, Germany
- Food Chemistry, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Wuppertal, Germany
- * E-mail:
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