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Quantitative mass spectrometry imaging of emtricitabine in cervical tissue model using infrared matrix-assisted laser desorption electrospray ionization. Anal Bioanal Chem 2014; 407:2073-84. [PMID: 25318460 DOI: 10.1007/s00216-014-8220-y] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 09/23/2014] [Accepted: 09/25/2014] [Indexed: 10/24/2022]
Abstract
A quantitative mass spectrometry imaging (QMSI) technique using infrared matrix-assisted laser desorption electrospray ionization (IR-MALDESI) is demonstrated for the antiretroviral (ARV) drug emtricitabine in incubated human cervical tissue. Method development of the QMSI technique leads to a gain in sensitivity and removal of interferences for several ARV drugs. Analyte response was significantly improved by a detailed evaluation of several cationization agents. Increased sensitivity and removal of an isobaric interference was demonstrated with sodium chloride in the electrospray solvent. Voxel-to-voxel variability was improved for the MSI experiments by normalizing analyte abundance to a uniformly applied compound with similar characteristics to the drug of interest. Finally, emtricitabine was quantified in tissue with a calibration curve generated from the stable isotope-labeled analog of emtricitabine followed by cross-validation using liquid chromatography tandem mass spectrometry (LC-MS/MS). The quantitative IR-MALDESI analysis proved to be reproducible with an emtricitabine concentration of 17.2 ± 1.8 μg/gtissue. This amount corresponds to the detection of 7 fmol/voxel in the IR-MALDESI QMSI experiment. Adjacent tissue slices were analyzed using LC-MS/MS which resulted in an emtricitabine concentration of 28.4 ± 2.8 μg/gtissue.
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52
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Marsching C, Jennemann R, Heilig R, Gröne HJ, Hopf C, Sandhoff R. Quantitative imaging mass spectrometry of renal sulfatides: validation by classical mass spectrometric methods. J Lipid Res 2014; 55:2343-53. [PMID: 25274613 DOI: 10.1194/jlr.m051821] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Owing to its capability of discriminating subtle mass-altering structural differences such as double bonds or elongated acyl chains, MALDI-based imaging MS (IMS) has emerged as a powerful technique for analysis of lipid distribution in tissue at moderate spatial resolution of about 50 μm. However, it is still unknown if MS(1)-signals and ion intensity images correlate with the corresponding apparent lipid concentrations. Analyzing renal sulfated glycosphingolipids, sulfatides, we validate for the first time IMS-signal identities using corresponding sulfatide-deficient kidneys. To evaluate the extent of signal quenching effects interfering with lipid quantification, we surgically dissected the three major renal regions (papillae, medulla, and cortex) and systematically compared MALDI IMS of renal sulfatides with quantitative analyses of corresponding lipid extracts by on-target MALDI TOF-MS and by ultra-performance LC-ESI-(triple-quadrupole)tandem MS. Our results demonstrate a generally strong correlation (R(2) > 0.9) between the local relative sulfatide signal intensity in MALDI IMS and absolute sulfatide quantities determined by the other two methods. However, high concentrations of sulfatides in the papillae and medulla result in an up to 4-fold signal suppression. In conclusion, our study suggests that MALDI IMS is useful for semi-quantitative dissection of relative local changes of sulfatides and possibly other lipids in tissue.
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Affiliation(s)
- Christian Marsching
- Center for Applied Research "Applied Biomedical Mass Spectrometry" (ABIMAS), Mannheim, Germany Lipid Pathobiochemistry Group within German Cancer Research Center (DKFZ), Heidelberg, Germany Department of Cellular and Molecular Pathology, German Cancer Research Center (DKFZ), Heidelberg, Germany Institute of Medical Technology, University of Heidelberg and Mannheim University of Applied Sciences, Mannheim, Germany
| | - Richard Jennemann
- Department of Cellular and Molecular Pathology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Raphael Heilig
- Lipid Pathobiochemistry Group within German Cancer Research Center (DKFZ), Heidelberg, Germany Instrumental Analytics and Bioanalytics, Mannheim University of Applied Sciences, Mannheim, Germany
| | - Hermann-Josef Gröne
- Center for Applied Research "Applied Biomedical Mass Spectrometry" (ABIMAS), Mannheim, Germany Department of Cellular and Molecular Pathology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Carsten Hopf
- Center for Applied Research "Applied Biomedical Mass Spectrometry" (ABIMAS), Mannheim, Germany Institute of Medical Technology, University of Heidelberg and Mannheim University of Applied Sciences, Mannheim, Germany Instrumental Analytics and Bioanalytics, Mannheim University of Applied Sciences, Mannheim, Germany
| | - Roger Sandhoff
- Center for Applied Research "Applied Biomedical Mass Spectrometry" (ABIMAS), Mannheim, Germany Lipid Pathobiochemistry Group within German Cancer Research Center (DKFZ), Heidelberg, Germany Department of Cellular and Molecular Pathology, German Cancer Research Center (DKFZ), Heidelberg, Germany Instrumental Analytics and Bioanalytics, Mannheim University of Applied Sciences, Mannheim, Germany
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53
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Schulz S, Gerhardt D, Meyer B, Seegel M, Schubach B, Hopf C, Matheis K. DMSO-enhanced MALDI MS imaging with normalization against a deuterated standard for relative quantification of dasatinib in serial mouse pharmacology studies. Anal Bioanal Chem 2014; 405:9467-76. [PMID: 24121470 DOI: 10.1007/s00216-013-7393-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 09/23/2013] [Accepted: 09/23/2013] [Indexed: 10/26/2022]
Abstract
Matrix-assisted laser desorption/ionization mass spectrometry imaging is an emerging powerful technique in drug metabolism and pharmacokinetics research. Despite recent progress in mass-spectrometry-based localization and relative quantification of small-molecule drugs and their metabolites in tissue, improved methods for drug extraction/ionization are required. Furthermore, relative quantification of drugs by mass spectrometry imaging in larger rodent cohorts is a necessary proof-of-concept study to demonstrate the utility of such a workflow in an industrial setting. Using as an example the tyrosine kinase inhibitor dasatinib, a leukemia drug, we demonstrate that inclusion of dimethyl sulfoxide in standard matrix solutions significantly improves ion intensity in mass spectrometry images and reveals enrichment of the drug in mouse kidney medulla. We furthermore show in a time-course study in multiple mice that normalization against a deuterated internal standard, dasatinib-D8, which is applied together with the matrix, makes possible relative quantification of the drug that correlates well with canonical liquid chromatography–tandem mass spectrometry based drug quantification.
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54
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Lagarrigue M, Lavigne R, Tabet E, Genet V, Thomé JP, Rondel K, Guével B, Multigner L, Samson M, Pineau C. Localization and in situ absolute quantification of chlordecone in the mouse liver by MALDI imaging. Anal Chem 2014; 86:5775-83. [PMID: 24837422 DOI: 10.1021/ac500313s] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Chlordecone is an organochlorine pesticide that was extensively used in the French West Indies to fight weevils in banana plantations from 1973 to 1993. This has led to a persistent pollution of the environment and to the contamination of the local population for several decades with effects demonstrated on human health. Chlordecone accumulates mainly in the liver where it is known to potentiate the action of hepatotoxic agents. However, there is currently no information on its in situ localization in the liver. We have thus evaluated a matrix-assisted laser desorption ionization (MALDI) imaging quantification method based on labeled normalization for the in situ localization and quantification of chlordecone. After validating the linearity and the reproducibility of this method, quantitative MALDI imaging was used to study the accumulation of chlordecone in the mouse liver. Our results revealed that normalized intensities measured by MALDI imaging could be first converted in quantitative units. These quantities appeared to be different from absolute quantities of chlordecone determined by gas chromatography (GC), but they were perfectly correlated (R(2) = 0.995). The equation of the corresponding correlation curve was thus efficiently used to convert quantities measured by MALDI imaging into absolute quantities. Our method combining labeled normalization and calibration with an orthogonal technique allowed the in situ absolute quantification of chlordecone by MALDI imaging. Finally, our results obtained on the pathological mouse liver illustrate the advantages of quantitative MALDI imaging which preserves information on in situ localization without radioactive labeling and with a simple sample preparation.
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Affiliation(s)
- Mélanie Lagarrigue
- Proteomics Core Facility Biogenouest, Inserm U1085, Institut de Recherche en Santé, Environnement et Travail, Campus de Beaulieu, Université de Rennes 1 , F-35042 Rennes, France
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55
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Tomlinson L, Fuchser J, Fütterer A, Baumert M, Hassall DG, West A, Marshall PS. Using a single, high mass resolution mass spectrometry platform to investigate ion suppression effects observed during tissue imaging. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2014; 28:995-1003. [PMID: 24677520 DOI: 10.1002/rcm.6869] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 02/12/2014] [Accepted: 02/13/2014] [Indexed: 05/24/2023]
Abstract
RATIONALE The signal intensity of a given molecule across a tissue section when measured using mass spectrometry imaging (MSI) is prone to changes caused by the molecular heterogeneity across the surface of the tissue. Here we propose a strategy to investigate these effects using electrospray ionization (ESI) and matrix-assisted laser desorption/ionization (MALDI) on a single high-resolution mass spectrometry (HRMS) platform. METHODS A rat was administered with a single inhaled dose of a compound and sacrificed 1 h after dosing. Sections were prepared from the excised frozen lung and analysed using MALDI, liquid extraction surface analysis (LESA) nano-ESI-MS and nano-ESI liquid chromatography (LC)/MS. The ESI and MALDI ion sources were mounted either side of the ion transfer system of the same Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer. RESULTS MALDI MSI clearly demonstrated widespread distribution of the dosed molecule throughout the lung, with the exception of a non-lung section of tissue on the same sample surface. Comparison of the lipid signals across the sample indicated a change in signal between the lung and the adipose tissue present on the same section. Use of ESI and MALDI, with and without an internal standard, supported the evaluation of changes in the signal of the dosed molecule across the tissue section. CONCLUSIONS The results demonstrate the successful application of a dual ion source HRMS system to the systematic evaluation of data from MALDI MSI, used to determine the distribution of an inhaled drug in the lung. The system discussed is of great utility in investigating the effects of ion suppression and evaluating the quantitative and qualitative nature of the MSI data.
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Affiliation(s)
- Laura Tomlinson
- Platform Technology and Science (PTS), Chemical Sciences, UK, GlaxoSmithKline (GSK), Medicines Research Centre, Gunnels Wood Road, Stevenage, SG1 2NY, UK
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56
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Gessel MM, Norris JL, Caprioli RM. MALDI imaging mass spectrometry: spatial molecular analysis to enable a new age of discovery. J Proteomics 2014; 107:71-82. [PMID: 24686089 DOI: 10.1016/j.jprot.2014.03.021] [Citation(s) in RCA: 171] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Accepted: 03/20/2014] [Indexed: 12/26/2022]
Abstract
Matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI IMS) combines the sensitivity and selectivity of mass spectrometry with spatial analysis to provide a new dimension for histological analyses to provide unbiased visualization of the arrangement of biomolecules in tissue. As such, MALDI IMS has the capability to become a powerful new molecular technology for the biological and clinical sciences. In this review, we briefly describe several applications of MALDI IMS covering a range of molecular weights, from drugs to proteins. Current limitations and challenges are discussed along with recent developments to address these issues. This article is part of a Special Issue entitled: 20years of Proteomics in memory of Viatliano Pallini. Guest Editors: Luca Bini, Juan J. Calvete, Natacha Turck, Denis Hochstrasser and Jean-Charles Sanchez.
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Affiliation(s)
- Megan M Gessel
- National Research Resource for Imaging Mass Spectrometry, Mass Spectrometry Research Center, Vanderbilt University School of Medicine, 9160 Medical Research Building III, 465 21st Avenue South, Nashville, TN 37232-8575, United States; Department of Biochemistry, Vanderbilt University School of Medicine, 9160 Medical Research Building III, 465 21st Avenue South, Nashville, TN 37232-8575, United States
| | - Jeremy L Norris
- National Research Resource for Imaging Mass Spectrometry, Mass Spectrometry Research Center, Vanderbilt University School of Medicine, 9160 Medical Research Building III, 465 21st Avenue South, Nashville, TN 37232-8575, United States; Department of Biochemistry, Vanderbilt University School of Medicine, 9160 Medical Research Building III, 465 21st Avenue South, Nashville, TN 37232-8575, United States
| | - Richard M Caprioli
- National Research Resource for Imaging Mass Spectrometry, Mass Spectrometry Research Center, Vanderbilt University School of Medicine, 9160 Medical Research Building III, 465 21st Avenue South, Nashville, TN 37232-8575, United States; Department of Biochemistry, Vanderbilt University School of Medicine, 9160 Medical Research Building III, 465 21st Avenue South, Nashville, TN 37232-8575, United States.
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57
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Recent methodological advances in MALDI mass spectrometry. Anal Bioanal Chem 2014; 406:2261-78. [PMID: 24652146 DOI: 10.1007/s00216-014-7646-6] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 01/17/2014] [Accepted: 01/21/2014] [Indexed: 10/25/2022]
Abstract
Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is widely used for characterization of large, thermally labile biomolecules. Advantages of this analytical technique are high sensitivity, robustness, high-throughput capacity, and applicability to a wide range of compound classes. For some years, MALDI-MS has also been increasingly used for mass spectrometric imaging as well as in other areas of clinical research. Recently, several new concepts have been presented that have the potential to further advance the performance characteristics of MALDI. Among these innovations are novel matrices with low proton affinities for particularly efficient protonation of analyte molecules, use of wavelength-tunable lasers to achieve optimum excitation conditions, and use of liquid matrices for improved quantification. Instrumental modifications have also made possible MALDI-MS imaging with cellular resolution as well as an efficient generation of multiply charged MALDI ions by use of heated vacuum interfaces. This article reviews these recent innovations and gives the author's personal outlook of possible future developments.
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58
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Hong R, True J, Bieniarz C. Enzymatically Amplified Mass Tags for Tissue Mass Spectrometry Imaging. Anal Chem 2014; 86:1459-67. [DOI: 10.1021/ac402718f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Rui Hong
- Ventana Medical Systems, Inc., Technology and Applied Research, 1910 E. Innovation Park Drive, Oro Valley, Arizona 85755, United States
| | - Jan True
- Ventana Medical Systems, Inc., Technology and Applied Research, 1910 E. Innovation Park Drive, Oro Valley, Arizona 85755, United States
| | - Christopher Bieniarz
- Ventana Medical Systems, Inc., Technology and Applied Research, 1910 E. Innovation Park Drive, Oro Valley, Arizona 85755, United States
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59
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Škrášková K, Heeren RM. A review of complementary separation methods and matrix assisted laser desorption ionization-mass spectrometry imaging: Lowering sample complexity. J Chromatogr A 2013; 1319:1-13. [DOI: 10.1016/j.chroma.2013.10.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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60
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A critical evaluation of the current state-of-the-art in quantitative imaging mass spectrometry. Anal Bioanal Chem 2013; 406:1275-89. [DOI: 10.1007/s00216-013-7478-9] [Citation(s) in RCA: 118] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 10/28/2013] [Accepted: 10/31/2013] [Indexed: 01/29/2023]
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61
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Groseclose MR, Castellino S. A mimetic tissue model for the quantification of drug distributions by MALDI imaging mass spectrometry. Anal Chem 2013; 85:10099-106. [PMID: 24024735 DOI: 10.1021/ac400892z] [Citation(s) in RCA: 145] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The full potential of imaging mass spectrometry (IMS) as a tool in drug development will not be realized until reliable quantitative information can be integrated with the molecular distributions. Here we report a novel method for the quantification of drugs in tissue sections using matrix-assisted laser desorption/ionization (MALDI) IMS. This method uses a mimetic tissue model consisting of a set of tissue homogenates spiked with a range of different drug concentrations that have been frozen into a polymer support mold. The goal of this model is to mimic a dosed tissue in its effects on analyte extraction and ion suppression. Parallel preparation and analysis of sections from the tissue model and the dosed tissues allow for the quantification of a drug's distribution. Here we detail the steps involved in constructing the model and provide proof of concept data to highlight the potential of this approach. Several figures of merit are evaluated including linearity of response, variability, and section-to-section reproducibility. Finally, the tissue model is used to quantify two different drugs, lapatinib and nevirapine, in dosed tissues from nonclinical species and the results are compared with those generated by LC-MS quantification.
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Affiliation(s)
- M Reid Groseclose
- Drug Metabolism and Pharmacokinetics, GlaxoSmithKline , Research Triangle Park, North Carolina 27709, United States
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