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Zhang W, Guled F, Hankemeier T, Ramautar R. Profiling nucleotides in low numbers of mammalian cells by sheathless CE-MS in positive ion mode: Circumventing corona discharge. Electrophoresis 2020; 41:360-369. [PMID: 31907937 DOI: 10.1002/elps.201900417] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 12/16/2019] [Accepted: 12/20/2019] [Indexed: 12/26/2022]
Abstract
Negative ion mode nano-ESI-MS is often considered for the analysis of acidic compounds, including nucleotides. However, under high aqueous separation conditions, corona discharge is frequently observed at emitter tips, which may result in low ion abundances and reduced nano-ESI needle emitter lifetimes. In this work, we introduce a sheathless CE-MS method for the highly efficient and sensitive analysis of nucleotides employing ESI in positive ion mode, thereby fully circumventing corona discharge. By using a background electrolyte of 16 mM ammonium acetate (pH 9.7) a mixture of 12 nucleotides, composed of mono-, di-, and tri-phosphates, could be efficiently analyzed with plate numbers per meter above 220 000 and with LODs in the range from 0.06 to 1.3 nM, corresponding to 0.4 to 8.6 attomole, when using an injection volume of about 6.5 nL only. The utility of the method was demonstrated for the profiling of nucleotides in low numbers of mammalian cells using HepG2 cells as a model system. Endogenous nucleotides could be efficiently analyzed in extracts from 50 000 down to 500 HepG2 cells only. Moreover, apart from nucleotides, also some nicotinamide-adenine dinucleotides and amino acids could be analyzed under these conditions, thereby clearly illustrating the utility of this approach for metabolic profiling of low amounts of biological material.
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Affiliation(s)
- Wei Zhang
- Biomedical Microscale Analytics, Division of Systems Biomedicine and Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands
| | - Faisa Guled
- Biomedical Microscale Analytics, Division of Systems Biomedicine and Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands
| | - Thomas Hankemeier
- Biomedical Microscale Analytics, Division of Systems Biomedicine and Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands.,Netherlands Metabolomics Centre, Leiden, The Netherlands
| | - Rawi Ramautar
- Biomedical Microscale Analytics, Division of Systems Biomedicine and Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands
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Ellero-Simatos S, Beitelshees AL, Lewis JP, Yerges-Armstrong LM, Georgiades A, Dane A, Harms AC, Strassburg K, Guled F, Hendriks MMWB, Horenstein RB, Shuldiner AR, Hankemeier T, Kaddurah-Daouk R. Oxylipid Profile of Low-Dose Aspirin Exposure: A Pharmacometabolomics Study. J Am Heart Assoc 2015; 4:e002203. [PMID: 26504148 PMCID: PMC4845113 DOI: 10.1161/jaha.115.002203] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Background While aspirin is a well‐established and generally effective anti‐platelet agent, considerable inter‐individual variation in drug response exists, for which mechanisms are not completely understood. Metabolomics allows for extensive measurement of small molecules in biological samples, enabling detailed mapping of pathways involved in drug response. Methods and Results We used a mass‐spectrometry‐based metabolomics platform to investigate the changes in the serum oxylipid metabolome induced by an aspirin intervention (14 days, 81 mg/day) in healthy subjects (n=156). We observed a global decrease in serum oxylipids in response to aspirin (25 metabolites decreased out of 30 measured) regardless of sex. This decrease was concomitant with a significant decrease in serum linoleic acid levels (−19%, P=1.3×10−5), one of the main precursors for oxylipid synthesis. Interestingly, several linoleic acid‐derived oxylipids were not significantly associated with arachidonic‐induced ex vivo platelet aggregation, a widely accepted marker of aspirin response, but were significantly correlated with platelet reactivity in response to collagen. Conclusions Together, these results suggest that linoleic acid‐derived oxylipids may contribute to the non‐COX1 mediated variability in response to aspirin. Pharmacometabolomics allowed for more comprehensive interrogation of mechanisms of action of low dose aspirin and of variation in aspirin response.
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Affiliation(s)
- Sandrine Ellero-Simatos
- Analytical Biosciences Division, Leiden Academic Centre for Drug Research, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.) Netherlands Metabolomics Centre, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.)
| | - Amber L Beitelshees
- Program Personalized and Genomic Medicine, Division of Endocrinology, Diabetes, and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (A.L.B., J.P.L., L.M.Y.A., R.B.H., A.R.S.)
| | - Joshua P Lewis
- Program Personalized and Genomic Medicine, Division of Endocrinology, Diabetes, and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (A.L.B., J.P.L., L.M.Y.A., R.B.H., A.R.S.)
| | - Laura M Yerges-Armstrong
- Program Personalized and Genomic Medicine, Division of Endocrinology, Diabetes, and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (A.L.B., J.P.L., L.M.Y.A., R.B.H., A.R.S.)
| | | | - Adrie Dane
- Analytical Biosciences Division, Leiden Academic Centre for Drug Research, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.) Netherlands Metabolomics Centre, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.)
| | - Amy C Harms
- Analytical Biosciences Division, Leiden Academic Centre for Drug Research, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.) Netherlands Metabolomics Centre, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.)
| | - Katrin Strassburg
- Analytical Biosciences Division, Leiden Academic Centre for Drug Research, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.) Netherlands Metabolomics Centre, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.)
| | - Faisa Guled
- Analytical Biosciences Division, Leiden Academic Centre for Drug Research, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.) Netherlands Metabolomics Centre, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.)
| | - Margriet M W B Hendriks
- Analytical Biosciences Division, Leiden Academic Centre for Drug Research, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.) Netherlands Metabolomics Centre, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.)
| | - Richard B Horenstein
- Program Personalized and Genomic Medicine, Division of Endocrinology, Diabetes, and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (A.L.B., J.P.L., L.M.Y.A., R.B.H., A.R.S.)
| | - Alan R Shuldiner
- Program Personalized and Genomic Medicine, Division of Endocrinology, Diabetes, and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (A.L.B., J.P.L., L.M.Y.A., R.B.H., A.R.S.)
| | - Thomas Hankemeier
- Analytical Biosciences Division, Leiden Academic Centre for Drug Research, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.) Netherlands Metabolomics Centre, Leiden, The Netherlands (S.E.S., A.D., A.C.H., K.S., F.G., M.B.H., T.H.)
| | - Rima Kaddurah-Daouk
- Duke University Medical Center, Durham, NC (A.G., R.K.D.) Department of Psychiatry and Behavioral Sciences, Duke University, Durham, NC (R.K.D.) Duke Institute for Brain Sciences, Duke University, Durham, NC (R.K.D.) Institute of Genome Science and Policy, Durham, NC (R.K.D.)
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