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Zagorac T, López Peña HA, Gross JM, Tibbetts KM, Hanley L. Experimental and Theoretical Analysis of Tricyclic Antidepressants by Ultraviolet Picosecond Laser Desorption Post-Ionization Mass Spectrometry. Anal Chem 2023; 95:17541-17549. [PMID: 37983268 DOI: 10.1021/acs.analchem.3c02735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
Imipramine class tricyclic antidepressants have low ionization efficiencies that make them difficult to detect by using secondary ion mass spectrometry. Ultraviolet picosecond laser desorption postionization (ps-LDPI-MS) is examined here for the detection of four tricyclic antidepressants: imipramine, desipramine, amitriptyline, and clomipramine. About 30 ps laser pulses at either 213 nm (5.8 eV) or 355 nm (3.5 eV) are used for desorption of samples under vacuum, 7.9 eV (157 nm) fluorine laser pulses are used for post-ionization, and the ions so formed are detected by time-of-flight mass spectrometry. Detection of imipramine by 213 nm ps-LDPI-MS shows less fragmentation than either 355 nm ps-LDPI-MS or prior results from 800 nm fs-LDPI-MS. Ionization energies of imipramine, desipramine, amitriptyline, and clomipramine are predicted using density functional theory calculations and used to explain the corresponding ps-LDPI-MS data for these four compounds as resulting from single-photon ionization. The experimental observation of low-mass amine-containing fragments with calculated ionization energies below 7.9 eV is attributed mostly to dissociation during laser desorption, followed by single-photon ionization of the neutral fragments rather than the more traditional mechanism of unimolecular dissociation following single-photon ionization of the parent molecule.
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Affiliation(s)
- Teodora Zagorac
- Department of Chemistry, University of Illinois Chicago, Chicago, Illinois 60607, United States
| | - Hugo Andrés López Peña
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Jason M Gross
- Department of Chemistry, University of Illinois Chicago, Chicago, Illinois 60607, United States
| | - Katharine Moore Tibbetts
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Luke Hanley
- Department of Chemistry, University of Illinois Chicago, Chicago, Illinois 60607, United States
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2
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Daphnis T, Tomasetti B, Delmez V, Vanvarenberg K, Préat V, Thieffry C, Henriet P, Dupont-Gillain C, Delcorte A. Improvement of Lipid Detection in Mouse Brain and Human Uterine Tissue Sections Using In Situ Matrix Enhanced Secondary Ion Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023; 34:2259-2268. [PMID: 37712225 DOI: 10.1021/jasms.3c00195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/16/2023]
Abstract
The potential of mass spectrometry imaging, and especially ToF-SIMS 2D and 3D imaging, for submicrometer-scale, label-free molecular localization in biological tissues is undisputable. Nevertheless, sensitivity issues remain, especially when one wants to achieve the best lateral and vertical (nanometer-scale) resolution. In this study, the interest of in situ matrix transfer for tissue analysis with cluster ion beams (Bin+, Arn+) is explored in detail, using a series of six low molecular weight acidic (MALDI) matrices. After estimating the sensitivity enhancements for phosphatidylcholine (PC), an abundant lipid type present in almost any kind of cell membrane, the most promising matrices were softly transferred in situ on mouse brain and human uterine tissue samples using a 10 keV Ar3000+ cluster beam. Signal enhancements up to 1 order of magnitude for intact lipid signals were observed in both tissues under Bi5+ and Ar3000+ bombardment. The main findings of this study lie in the in-depth characterization of uterine tissue samples, the demonstration that the transferred matrices also improve signal efficiency in the negative ion polarity and that they perform as well when using Bin+ and Arn+ primary ions for analysis and imaging.
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Affiliation(s)
- Thomas Daphnis
- Institute of Condensed Matter and Nanoscience, Université catholique de Louvain, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium
| | - Benjamin Tomasetti
- Institute of Condensed Matter and Nanoscience, Université catholique de Louvain, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium
| | - Vincent Delmez
- Institute of Condensed Matter and Nanoscience, Université catholique de Louvain, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium
| | - Kevin Vanvarenberg
- Louvain Drug Research Institute, Université catholique de Louvain, Avenue Mounier 73, 1200 Brussels, Belgium
| | - Véronique Préat
- Louvain Drug Research Institute, Université catholique de Louvain, Avenue Mounier 73, 1200 Brussels, Belgium
| | - Charlotte Thieffry
- Institut De Duve, Université catholique de Louvain, Avenue Hippocrate 75, 1200 Brussels, Belgium
| | - Patrick Henriet
- Institut De Duve, Université catholique de Louvain, Avenue Hippocrate 75, 1200 Brussels, Belgium
| | - Christine Dupont-Gillain
- Institute of Condensed Matter and Nanoscience, Université catholique de Louvain, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium
| | - Arnaud Delcorte
- Institute of Condensed Matter and Nanoscience, Université catholique de Louvain, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium
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3
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Tomasetti B, Lauzin C, Delcorte A. Enhancing Ion Signals and Improving Matrix Selection in Time-of-Flight Secondary Ion Mass Spectrometry with Microvolume Expansion Using Large Argon Clusters. Anal Chem 2023; 95:13620-13628. [PMID: 37610942 DOI: 10.1021/acs.analchem.3c02404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Abstract
The molecular environment has an important impact on the ionization mechanism in time-of-flight secondary ion mass spectrometry (ToF-SIMS). In complex samples, desorption/ionization, and thus the detection of a molecular signal, can be hampered by molecular entanglement, ionization-suppressive neighbors, or even an unfavorable sample substrate. Here, a method called microvolume expansion is developed to overcome these negative effects. Large argon clusters are able to transfer biomolecules from a target to a collector in vacuum. In this study, argon gas cluster ion beams (Arn+-GCIB with n centered around 3000 or 5000) are used to expand a microvolume from the sample to a collector, which is a material ideally enhancing the ionization yield. The collector is then analyzed using a liquid metal ion gun. The signal amplification factor corresponding to the expansion of phosphatidylcholine (PC) lipid on collectors partially covered with acidic matrices was evaluated as an initial proof of concept. In one experiment, the PC expansion on a pattern of four drop-casted matrix-assisted laser desorption/ionization matrices led to the selection of α-cyano-4-hydroxycinnamic (CHCA) as the optimal candidate for cationic PC detection. The ion signal is increased by at least three orders of magnitude when PC was expanded using 10 keV Ar3000+ and Ar5000+ on a sublimated layer of CHCA. Finally, the expansion of the gray matter of a mouse on different materials (Si, Au-coated Si, CHCA, and polyethylene) was achieved with varying degrees of success, demonstrating the potential of the method to further analyze complex and fragile biological assemblies.
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Affiliation(s)
- Benjamin Tomasetti
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Clément Lauzin
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Arnaud Delcorte
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
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4
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Lorenz M, Zhang J, Shard AG, Vorng JL, Rakowska PD, Gilmore IS. Method for Molecular Layer Deposition Using Gas Cluster Ion Beam Sputtering with Example Application In Situ Matrix-Enhanced Secondary Ion Mass Spectrometry. Anal Chem 2021; 93:3436-3444. [PMID: 33571411 DOI: 10.1021/acs.analchem.0c04680] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We introduce a technique for the directed transfer of molecules from an adjacent reservoir onto a sample surface inside the vacuum chamber of a ToF-SIMS instrument using gas cluster ion beam (GCIB) sputtering. An example application for in situ matrix-enhanced secondary ion mass spectrometry (ME SIMS) is provided. This protocol has attractive features since most modern SIMS instruments are equipped with a GCIB gun. No solvents are required that would delocalize analytes at the surface, and the transfer of matrix molecules can be interlaced with SIMS depth profiling and 3D imaging sputtering and analysis cycles, which is not possible with conventional ME SIMS strategies. The amount of molecular deposition can be finely tuned, which is important for such a surface sensitive technique as SIMS. To demonstrate the concept, we used 2,5-DHB as a matrix for the enhancement of three drug molecules embedded in a tissue homogenate. By automatic operation of sputter deposition and erosion (cleanup) cycles, depth profiling could be achieved with ME SIMS with good repeatability (<4% RSD). Furthermore, we explored several different matrix compounds, including α-CHCA and aqueous solutions of Brønsted acids (formic acid) and 3-nitrobenzonitrile, a volatile compound known to spontaneously produce ions. The latter two matrix compounds were applied at cryogenic measurement conditions, which extend the range of matrices applicable for ME SIMS. Enhancement ratios range from 2 to 13, depending on the analytes and matrix. The method works in principle, but enhancement ratios for the drug molecules are rather limited at this point. Further study and optimization is needed, and the technique introduced here provides a tool to perform systematic studies of matrix compounds and experimental conditions for their potential for signal enhancement in ME SIMS.
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Affiliation(s)
- Matthias Lorenz
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom
| | - Junting Zhang
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom
| | - Alexander G Shard
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom
| | - Jean-Luc Vorng
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom
| | - Paulina D Rakowska
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom
| | - Ian S Gilmore
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom
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5
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Pieterse CL, Rungger I, Gilmore IS, Wickramasinghe RC, Hanley L. An Experimental and Theoretical Study of Laser Postionization of Femtosecond-Laser-Desorbed Drug Molecules. J Phys Chem Lett 2020; 11:8616-8622. [PMID: 32960067 DOI: 10.1021/acs.jpclett.0c02365] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Femtosecond laser desorption postionization mass spectrometry using 7.9 eV single-photon ionization (7.9 eV fs-LDPI-MS) detected three of four drug compounds previously found to have very low ionization efficiencies by secondary ion mass spectrometry. Electronic structure calculations of the ionization energies and other properties of these four drug compounds predicted that all display ionization energies below the 7.9 eV photon energy, as required for single-photon ionization. The 7.9 eV fs-LDPI-MS of carbamazepine, imipramine, and verapamil all showed significant precursor (M+) ion signal, but no representative signal was observed for ciprofloxacin. Furthermore, 7.9 eV fs-LDPI-MS displayed higher M+ signals and mostly similar fragment ions compared with 70 eV electron impact mass spectrometry. Ionization and fragmentation patterns are discussed in terms of calculated wave functions for the highest occupied molecular orbitals. The implications for improving lateral resolution and sensitivity of MS imaging of drug compounds are also considered.
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Affiliation(s)
| | - Ivan Rungger
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, U.K
| | - Ian S Gilmore
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, U.K
| | | | - Luke Hanley
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
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6
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Zhang J, Brown J, Scurr DJ, Bullen A, MacLellan-Gibson K, Williams P, Alexander MR, Hardie KR, Gilmore IS, Rakowska PD. Cryo-OrbiSIMS for 3D Molecular Imaging of a Bacterial Biofilm in Its Native State. Anal Chem 2020; 92:9008-9015. [PMID: 32460495 DOI: 10.1021/acs.analchem.0c01125] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Secondary ion mass spectrometry (SIMS) is gaining popularity for molecular imaging in the life sciences because it is label-free and allows imaging in two and three dimensions. The recent introduction of the OrbiSIMS has significantly improved the utility for biological imaging through combining subcellular spatial resolution with high-performance Orbitrap mass spectrometry. SIMS instruments operate in high-vacuum, and samples are typically analyzed in a freeze-dried state. Consequently, the molecular and structural information may not be well-preserved. We report a method for molecular imaging of biological materials, preserved in a native state, by using an OrbiSIMS instrument equipped with cryogenic sample handling and a high-pressure freezing protocol compatible with mass spectrometry. The performance is demonstrated by imaging a challenging sample (>90% water) of a mature Pseudomonas aeruginosa biofilm in its native state. The 3D distribution of quorum sensing signaling molecules, nucleobases, and bacterial membrane molecules is revealed with high spatial-resolution and high mass-resolution. We discover that analysis in the frozen-hydrated state yields a 10 000-fold increase in signal intensity for polar molecules such as amino acids, which has important implications for SIMS imaging of metabolites and pharmaceuticals.
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Affiliation(s)
- Junting Zhang
- NiCE-MSI, National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, U.K
| | - James Brown
- Biodiscovery Institute and School of Life Sciences, The University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - David J Scurr
- School of Pharmacy, The University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Anwen Bullen
- Biological Imaging Group, National Institute for Biological Standards and Controls, Blanche Lane, South Mimms, Potters Bar EN6 3QG, U.K.,UCL Ear Institute, 332 Grays Inn Road, London WC1X 8EE, U.K
| | - Kirsty MacLellan-Gibson
- Biological Imaging Group, National Institute for Biological Standards and Controls, Blanche Lane, South Mimms, Potters Bar EN6 3QG, U.K
| | - Paul Williams
- Biodiscovery Institute and School of Life Sciences, The University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Morgan R Alexander
- School of Pharmacy, The University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Kim R Hardie
- Biodiscovery Institute and School of Life Sciences, The University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Ian S Gilmore
- NiCE-MSI, National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, U.K.,School of Pharmacy, The University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Paulina D Rakowska
- NiCE-MSI, National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, U.K
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7
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Song X, He J, Li C, Sun C, Pang X, Zhang J, Zang Q, Luo Z, Li X, Zhang R, Abliz Z. Fabrication of homogenous three-dimensional biomimetic tissue for mass spectrometry imaging. JOURNAL OF MASS SPECTROMETRY : JMS 2019; 54:378-388. [PMID: 30742348 DOI: 10.1002/jms.4342] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2018] [Revised: 01/26/2019] [Accepted: 02/06/2019] [Indexed: 06/09/2023]
Abstract
Reference samples are essential for mass spectrometric method optimization, data quality control, and target analyte quantitation. However, it is highly challenging to prepare an ideal homogeneous, standard-spiked tissue sample for mass spectrometry imaging (MSI) research. Herein, we present a standard-spiked 3D biomimetic tissue model fabricated with native cells, homogenate matrix, and biocompatible polymer. Unlike traditional homogenized tissue surrogates or those constructed with "on-tissue" or "under-tissue" micropipetting strategies, this simulated tissue shares both structural integrity of cells and homogeneous properties of matrix. As a result, analyte standards could undergo more in-depth incorporation and has a more comparable native status with a real tissue. Series of tissue sections made from the 3D tissue model were proven to be feasible and useful for the parameter optimization, analyte quantitation, and calibration curve fitting for the air-flow assisted desorption electrospray ionization MSI. Additionally, by analyzing the quality control model sections, we proposed a median principal component score calibration and demonstrated that this method can normalize instrumental fluctuations to stable levels in a large-scale untargeted MSI experiments for the reliable metabolomic biomarker discovery. Thus, these results indicated that the standard-spiked 3D biomimetic tissue has convincing significance in MSI analysis.
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Affiliation(s)
- Xiaowei Song
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Jiuming He
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Chao Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Chenglong Sun
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Xuechao Pang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Jin Zhang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Qingce Zang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Zhigang Luo
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Xin Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Ruiping Zhang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Zeper Abliz
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
- Centre for Imaging and Systems Biology, School of Pharmacy, Minzu University of China, Beijing, 100081, China
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8
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Hua X, Zhao LJ, Long YT. Investigation of the Ionization Mechanism of NAD +/NADH-Modified Gold Electrodes in ToF-SIMS Analysis. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2018; 29:1567-1570. [PMID: 29869326 DOI: 10.1007/s13361-018-1983-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 04/27/2018] [Accepted: 04/27/2018] [Indexed: 06/08/2023]
Abstract
Analysis of nicotinamide adenine dinucleotide (NAD+/NADH)-modified electrodes is important for in vitro monitoring of key biological processes. In this work, time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to analyze NAD+/NADH-modified gold electrodes. Interestingly, no obvious characteristic peaks of nicotinamide fragment could be observed in the mass spectra of NAD+/NADH in their neutral sodium pyrophosphate form. However, after acidification, the characteristic peaks for both NAD+ and NADH were detected. This was due to the suppression effect of inner pyrophosphoric salts in both neutral molecules. Besides, it was proved that the suppression by inner salt was intramolecular. No obvious suppression was found between neighboring molecules. These results demonstrated the suppression effect of inner salts in ToF-SIMS analysis, providing useful evidence for the study of ToF-SIMS ionization mechanism of organic molecule-modified electrodes. Graphical Abstract ᅟ.
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Affiliation(s)
- Xin Hua
- Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, People's Republic of China
| | - Li-Jun Zhao
- Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, People's Republic of China
| | - Yi-Tao Long
- Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, People's Republic of China.
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9
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Laser postionization of neutral molecules sputtered using bismuth and argon cluster primary ions. Biointerphases 2018; 13:03B412. [DOI: 10.1116/1.5019653] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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10
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Taylor AJ, Dexter A, Bunch J. Exploring Ion Suppression in Mass Spectrometry Imaging of a Heterogeneous Tissue. Anal Chem 2018; 90:5637-5645. [PMID: 29461803 DOI: 10.1021/acs.analchem.7b05005] [Citation(s) in RCA: 87] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In this study we have explored several aspects of regional analyte suppression in mass spectrometry imaging (MSI) of a heterogeneous sample, transverse cryosections of mouse brain. Olanzapine was homogeneously coated across the section prior to desorption electrospray ionization (DESI) and matrix-assisted laser desorption ionization (MALDI) mass spectrometry imaging. We employed the concept of a tissue extinction coefficient (TEC) to assess suppression of an analyte on tissue relative to its intensity in an off tissue region. We expanded the use of TEC, by first segmenting anatomical regions using graph-cuts clustering and calculating a TEC for each cluster. The single ion image of the olanzapine [M + H]+ ion was seen to vary considerably across the image, with anatomical features such as the white matter and hippocampus visible. While trends in regional ion suppression were conserved across MSI modalities, significant changes in the magnitude of relative regional suppression effects between techniques were seen. Notably the intensity of olanzapine was less suppressed in DESI than for MALDI. In MALDI MSI, significant differences in the concentration dependence of regional TECs were seen, with the TEC of white matter clusters exhibiting a notably stronger correlation with concentration than for clusters associated with gray matter regions. We further employed cluster-specific TECs as regional normalization factors. In comparison to published pixel-by-pixel normalization methods, regional TEC normalization exhibited superior reduction ion suppression artifacts. We also considered the usefulness of a segmentation-based approach to compare spectral information obtained from complementary modalities.
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Affiliation(s)
- Adam J Taylor
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI) , National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
| | - Alex Dexter
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI) , National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
| | - Josephine Bunch
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI) , National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K.,Department of Surgery and Cancer , Imperial College London , South Kensington Campus, London , SW7 2AZ , U.K
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11
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Jiang H, Passarelli MK, Munro PMG, Kilburn MR, West A, Dollery CT, Gilmore IS, Rakowska PD. High-resolution sub-cellular imaging by correlative NanoSIMS and electron microscopy of amiodarone internalisation by lung macrophages as evidence for drug-induced phospholipidosis. Chem Commun (Camb) 2018; 53:1506-1509. [PMID: 28085162 DOI: 10.1039/c6cc08549k] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Correlative NanoSIMS and EM imaging of amiodarone-treated macrophages shows the internalisation of the drug at a sub-cellular level and reveals its accumulation within the lysosomes, providing direct evidence for amiodarone-induced phospholipidosis. Chemical fixation using tannic acid effectively seals cellular membranes aiding intracellular retention of diffusible drugs.
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Affiliation(s)
- Haibo Jiang
- Centre for Microscopy, Characterisation and Analysis, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
| | - Melissa K Passarelli
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK.
| | - Peter M G Munro
- Institute of Ophthalmology, University College London, Bath Street, London EC1V 9EL, UK
| | - Matt R Kilburn
- Centre for Microscopy, Characterisation and Analysis, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
| | - Andrew West
- GlaxoSmithKline, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Colin T Dollery
- GlaxoSmithKline, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Ian S Gilmore
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK.
| | - Paulina D Rakowska
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK.
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12
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Newman CF, Havelund R, Passarelli MK, Marshall PS, Francis I, West A, Alexander MR, Gilmore IS, Dollery CT. Intracellular Drug Uptake-A Comparison of Single Cell Measurements Using ToF-SIMS Imaging and Quantification from Cell Populations with LC/MS/MS. Anal Chem 2017; 89:11944-11953. [PMID: 29039651 DOI: 10.1021/acs.analchem.7b01436] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
ToF-SIMS is a label-free imaging method that has been shown to enable imaging of amiodarone in single rat macrophage (NR8383) cells. In this study, we show that the method extends to three other cell lines relevant to drug discovery: human embryonic kidney (HEK293), cervical cancer (HeLa), and liver cancer (HepG2). There is significant interest in the variation of drug uptake at the single cell level, and we use ToF-SIMS to show that there is great diversity between individual cells and when comparing each of the cell types. These single cell measurements are compared to quantitative measurements of cell-associated amiodarone for the population using LC/MS/MS and cell counting with flow cytometry. NR8383 and HepG2 cells uptake the greatest amount of amiodarone with an average of 2.38 and 2.60 pg per cell, respectively, and HeLa and Hek 293 have a significantly lower amount of amiodarone at 0.43 and 0.36 pg per cell, respectively. The amount of cell-associated drug for the ensemble population measurement (LC/MS/MS) is compared with the ToF-SIMS single cell data: a similar amount of drug was detected per cell for the NR8383, and HepG2 cells at a greater level than that for the HEK293 cells. However, the two techniques did not agree for the HeLa cells, and we postulate potential reasons for this.
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Affiliation(s)
- Carla F Newman
- GlaxoSmithKline , Stevenage SG1 2NY, United Kingdom.,Division of Advanced Materials and Healthcare Technologies, School of Pharmacy, University of Nottingham , University Park, Nottingham NG7 2RD, United Kingdom
| | - Rasmus Havelund
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory (NPL) , Teddington, Middlesex TW11 0LW, United Kingdom
| | - Melissa K Passarelli
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory (NPL) , Teddington, Middlesex TW11 0LW, United Kingdom
| | | | - Ian Francis
- GlaxoSmithKline , Stevenage SG1 2NY, United Kingdom
| | - Andy West
- GlaxoSmithKline , Stevenage SG1 2NY, United Kingdom
| | - Morgan R Alexander
- Division of Advanced Materials and Healthcare Technologies, School of Pharmacy, University of Nottingham , University Park, Nottingham NG7 2RD, United Kingdom
| | - Ian S Gilmore
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory (NPL) , Teddington, Middlesex TW11 0LW, United Kingdom
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Hall Barrientos IJ, Paladino E, Szabó P, Brozio S, Hall PJ, Oseghale CI, Passarelli MK, Moug SJ, Black RA, Wilson CG, Zelkó R, Lamprou DA. Electrospun collagen-based nanofibres: A sustainable material for improved antibiotic utilisation in tissue engineering applications. Int J Pharm 2017; 531:67-79. [DOI: 10.1016/j.ijpharm.2017.08.071] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 07/31/2017] [Accepted: 08/08/2017] [Indexed: 12/29/2022]
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