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Hamm G, Maglennon G, Williamson B, Macdonald R, Doherty A, Jones S, Harris J, Blades J, Harmer AR, Barton P, Rawlins PB, Smith P, Winter-Holt J, McMurray L, Johansson J, Fitzpatrick P, McCoull W, Coen M. Pharmacological inhibition of MERTK induces in vivo retinal degeneration: a multimodal imaging ocular safety assessment. Arch Toxicol 2022; 96:613-624. [PMID: 34973110 PMCID: PMC8837544 DOI: 10.1007/s00204-021-03197-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Accepted: 11/11/2021] [Indexed: 12/26/2022]
Abstract
The receptor tyrosine kinase, MERTK, plays an essential role in homeostasis of the retina via efferocytosis of shed outer nuclear segments of photoreceptors. The Royal College of Surgeons rat model of retinal degeneration has been linked to loss-of-function of MERTK, and together with the MERTK knock-out mouse, phenocopy retinitis pigmentosa in humans with MERTK mutations. Given recent efforts and interest in MERTK as a potential immuno-oncology target, development of a strategy to assess ocular safety at an early pre-clinical stage is critical. We have applied a state-of-the-art, multi-modal imaging platform to assess the in vivo effects of pharmacological inhibition of MERTK in mice. This involved the application of mass spectrometry imaging (MSI) to characterize the ocular spatial distribution of our highly selective MERTK inhibitor; AZ14145845, together with histopathology and transmission electron microscopy to characterize pathological and ultra-structural change in response to MERTK inhibition. In addition, we assessed the utility of a human retinal in vitro cell model to identify perturbation of phagocytosis post MERTK inhibition. We identified high localized total compound concentrations in the retinal pigment epithelium (RPE) and retinal lesions following 28 days of treatment with AZ14145845. These lesions were present in 4 of 8 treated animals, and were characterized by a thinning of the outer nuclear layer, loss of photoreceptors (PR) and accumulation of photoreceptor outer segments at the interface of the RPE and PRs. Furthermore, the lesions were very similar to that shown in the RCS rat and MERTK knock-out mouse, suggesting a MERTK-induced mechanism of PR cell death. This was further supported by the observation of reduced phagocytosis in the human retinal cell model following treatment with AZ14145845. Our study provides a viable, translational strategy to investigate the pre-clinical toxicity of MERTK inhibitors but is equally transferrable to novel chemotypes.
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Affiliation(s)
- Gregory Hamm
- Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
| | - Gareth Maglennon
- Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
| | | | - Ruth Macdonald
- Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
| | - Ann Doherty
- Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
| | - Stewart Jones
- Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
| | - Jayne Harris
- Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
| | - James Blades
- Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
| | - Alexander R Harmer
- Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
| | | | | | - Paul Smith
- Oncology R&D, AstraZeneca, Cambridge, UK
| | | | | | - Julia Johansson
- Clinical Pharmacology & Safety Sciences, R&D, AstraZeneca, Gothenburg, Sweden
| | - Paul Fitzpatrick
- Clinical Pharmacology & Safety Sciences, R&D, AstraZeneca, Gothenburg, Sweden
| | | | - Muireann Coen
- Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK.
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Choudhary J, Dheeman S, Sharma V, Katiyar P, Karn SK, Sarangi MK, Chauhan AK, Verma G, Baliyan N. Insights of Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV-2) pandemic: a current review. Biol Proced Online 2021; 23:5. [PMID: 33526007 PMCID: PMC7849622 DOI: 10.1186/s12575-020-00141-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 12/25/2020] [Indexed: 01/08/2023] Open
Abstract
COVID-19, a pandemic of the 21st century caused by novel coronavirus SARS-CoV-2 was originated from China and shallowed world economy and human resource. The medical cures via herbal treatments, antiviral drugs, and vaccines still in progress, and studying rigorously. SARS-CoV-2 is more virulent than its ancestors due to evolution in the spike protein(s), mediates viral attachment to the host's membranes. The SARS-CoV-2 receptor-binding spike domain associates itself with human angiotensin-converting enzyme 2 (ACE-2) receptors. It causes respiratory ailments with irregularities in the hepatic, nervous, and gastrointestinal systems, as reported in humans suffering from COVID-19 and reviewed in the present article. There are several approaches, have been put forward by many countries under the world health organization (WHO) recommendations and some trial drugs were introduced for possible treatment of COVID-19, such as Lopinavir or Ritonavir, Arbidol, Chloroquine (CQ), Hydroxychloroquine (HCQ) and most important Remdesivir including other like Tocilizumab, Oritavancin, Chlorpromazine, Azithromycin, Baricitinib, etc. RT-PCR is the only and early detection test available besides the rapid test kit (serodiagnosis) used by a few countries due to unreasonable causes. Development of vaccine by several leader of pharmaceutical groups still under trial or waiting for approval for mass inoculation. Management strategies have been evolved by the recommendations of WHO, specifically important to control COVID-19 situations, in the pandemic era. This review will provide a comprehensive collection of studies to support future research and enhancement in our wisdom to combat COVID-19 pandemic and to serve humanity.
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Affiliation(s)
- Jyoti Choudhary
- Department of Microbiology, Chinmaya Degree College (Hemwati Nandan Bahuguna Garhwal University, Srinagar, Garhwal, Uttarakhand), Haridwar, Uttarakhand 249401 India
- Department of Botany and Microbiology, Gurukula Kangri Deemed to be University, Haridwar, Uttarakhand 249404 India
| | - Shrivardhan Dheeman
- Department of Microbiology, School of Life Sciences, Sardar Bhagwan Singh University, Dehradun, Uttarakhand 248161 India
| | - Vipin Sharma
- Department of Pharmaceuticals Sciences, Faculty of Ayurvedic and Medicinal Sciences, Gurukula Kangri Deemed to be University, Haridwar, Uttarakhand 249404 India
| | - Prashant Katiyar
- Department of Botany and Microbiology, Gurukula Kangri Deemed to be University, Haridwar, Uttarakhand 249404 India
| | - Santosh Kumar Karn
- Deaprtment of Biotechnology and Biochemistry, School of Life Sciences, Sardar Bhagwan Singh University, Dehradun, Uttarakhand 248161 India
| | - Manoj Kumar Sarangi
- Department of Pharmaceutical Sciences, School of Pharmaceutical Sciences and Technology, Sardar Bhagwan Singh University, Dehradun, Uttarakhand 248161 India
| | - Ankit Kumar Chauhan
- Department of Botany and Microbiology, Gurukula Kangri Deemed to be University, Haridwar, Uttarakhand 249404 India
- Atal Bihari Vajpayee Institute of Medical Sciences and Dr. Ram Manohar Lohia Hospital, New Delhi, 110001 India
| | - Gaurav Verma
- Deaprtment of Microbiology, Shri Dev Suman Subharti Medical College, Ras Bihari Bose Subharti University, Dehradun, Uttarakhand 248001 India
| | - Nitin Baliyan
- Department of Botany and Microbiology, Gurukula Kangri Deemed to be University, Haridwar, Uttarakhand 249404 India
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Hashem AM, Alghamdi BS, Algaissi AA, Alshehri FS, Bukhari A, Alfaleh MA, Memish ZA. Therapeutic use of chloroquine and hydroxychloroquine in COVID-19 and other viral infections: A narrative review. Travel Med Infect Dis 2020; 35:101735. [PMID: 32387694 PMCID: PMC7202851 DOI: 10.1016/j.tmaid.2020.101735] [Citation(s) in RCA: 81] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 04/28/2020] [Accepted: 04/29/2020] [Indexed: 12/17/2022]
Abstract
The rapidly spreading Coronavirus Disease (COVID-19) pandemic, caused by the severe acute respiratory syndrome coronavirus (SARS-CoV-2), represents an unprecedented serious challenge to the global public health community. The extremely rapid international spread of the disease with significant morbidity and mortality made finding possible therapeutic interventions a global priority. While approved specific antiviral drugs against SARS-CoV-2 are still lacking, a large number of existing drugs are being explored as a possible treatment for COVID-19 infected patients. Recent publications have re-examined the use of Chloroquine (CQ) and/or Hydroxychloroquine (HCQ) as a potential therapeutic option for these patients. In an attempt to explore the evidence that supports their use in COVID-19 patients, we comprehensively reviewed the previous studies which used CQ or HCQ as an antiviral treatment. Both CQ and HCQ demonstrated promising in vitro results, however, such data have not yet been translated into meaningful in vivo studies. While few clinical trials have suggested some beneficial effects of CQ and HCQ in COVID-19 patients, most of the reported data are still preliminary. Given the current uncertainty, it is worth being mindful of the potential risks and strictly rationalise the use of these drugs in COVID-19 patients until further high quality randomized clinical trials are available to clarify their role in the treatment or prevention of COVID-19.
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Affiliation(s)
- Anwar M Hashem
- Department of Medical Microbiology and Parasitology, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia; Vaccines and Immunnotherapy Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.
| | - Badrah S Alghamdi
- Department of Physiology, Neuroscience Unit, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia; Pre-Clinical Research Unit, King Fahad Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.
| | - Abdullah A Algaissi
- Department of Medical Laboratories Technology, College of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia; Medical Research Center, Jazan University, Jazan, Saudi Arabia.
| | - Fahad S Alshehri
- Department of Pharmacology and Toxicology, College of Pharmacy, Umm Al-Qura University, Makkah, Saudi Arabia.
| | - Abdullah Bukhari
- Department of Medicine, Faculty of Medicine, Imam Mohammed Ibn Saud Islamic University, Riyadh, Saudi Arabia.
| | - Mohamed A Alfaleh
- Vaccines and Immunnotherapy Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia; Faculty of Pharmacy; King Abdulaziz University, Jeddah, Saudi Arabia.
| | - Ziad A Memish
- King Saud Medical City, Research & Innovation Center, Ministry of Health, Saudi Arabia; Al-Faisal University, Riyadh, Saudi Arabia; Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA.
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Morikawa-Ichinose T, Fujimura Y, Murayama F, Yamazaki Y, Yamamoto T, Wariishi H, Miura D. Improvement of Sensitivity and Reproducibility for Imaging of Endogenous Metabolites by Matrix-Assisted Laser Desorption/Ionization-Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:1512-1520. [PMID: 31044355 DOI: 10.1007/s13361-019-02221-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 04/04/2019] [Accepted: 04/10/2019] [Indexed: 05/18/2023]
Abstract
Matrix-assisted laser desorption/ionization (MALDI)-mass spectrometry imaging (MSI) is a powerful technique to visualize the distributions of biomolecules without any labeling. In MALDI-MSI experiments, the choice of matrix deposition method is important for acquiring favorable MSI data with high sensitivity and high reproducibility. Generally, manual or automated spray-coating and automated sublimation methods are used, but these methods have some drawbacks with respect to detection sensitivity, spatial resolution, and data reproducibility. Herein, we present an optimized matrix deposition method of sublimation coupled with recrystallization using 9-aminoacridine (9-AA) as a matrix capable of ionizing endogenous metabolites. The matrix recrystallization process after sublimation was optimized for the solvent concentration and reaction temperature for matrix-metabolite co-crystallization. This optimized method showed excellent reproducibility and spatial resolution compared to the automatic spray-coating method. Furthermore, the recrystallization step after sublimation remarkably improved the detectability of metabolites, including amino acids, nucleotide derivatives, and lipids, compared with the conventional sublimation method. To date, there have been no other reports of 9-AA-based sublimation combined with recrystallization. The present method provides an easy, sensitive, and reproducible matrix deposition method for MALDI-MSI of endogenous metabolites. Graphical Abstract.
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Affiliation(s)
- Tomomi Morikawa-Ichinose
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
- Innovation Center for Medical Redox Navigation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Yoshinori Fujimura
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
- Innovation Center for Medical Redox Navigation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Fusa Murayama
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
- Innovation Center for Medical Redox Navigation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Yuzo Yamazaki
- Analytical Applications Department, Global Application Development Center, Shimadzu Corporation, 1 Nishinokyo-Kuwabaracho, Nakagyo-ku, Kyoto, 604-8511, Japan
| | - Takushi Yamamoto
- Analytical Applications Department, Global Application Development Center, Shimadzu Corporation, 1 Nishinokyo-Kuwabaracho, Nakagyo-ku, Kyoto, 604-8511, Japan
| | - Hiroyuki Wariishi
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
- Innovation Center for Medical Redox Navigation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Daisuke Miura
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan.
- Innovation Center for Medical Redox Navigation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology, Central 6, 1-1-1, Higashi, Tsukuba, Ibaraki, 305-8566, Japan.
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5
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Ocular bioanalysis: challenges and advancements in recent years for these rare matrices. Bioanalysis 2017; 9:1997-2014. [DOI: 10.4155/bio-2017-0175] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
There are many ocular diseases still presenting unmet medical needs. Therefore, new ophthalmologic drugs are being developed. Bioanalysis of eye compartments (along with plasma and other tissues) is important to determine exposure of the target organ to the drug and to help interpret local pharmacological or toxic effects. This review article identifies several challenges that occur within ocular bioanalysis. They include sample collection and preparation, analytical issues, sourcing control matrix, data interpretation and regulatory requirements. It summarizes how these challenges have been recently addressed, how research has advanced and which questions remain unanswered. Recommendations are made based on the literature and our practical experience within ocular bioanalysis and future perspectives are discussed.
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6
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Grove KJ, Kansara V, Prentiss M, Long D, Mogi M, Kim S, Rudewicz PJ. Application of Imaging Mass Spectrometry to Assess Ocular Drug Transit. SLAS DISCOVERY 2017; 22:1239-1245. [PMID: 28787579 DOI: 10.1177/2472555217724780] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI IMS) is becoming an important technology to determine the distribution of drugs and their metabolites in the tissue of preclinical species after dosing. Interest in IMS is growing in the ophthalmology field, but little work to this point has been done to investigate ocular drug transit using this technology. Information on where and how a drug is distributing through the eye is important in understanding efficacy and whether it is reaching the desired target tissue. For this study, ocular distribution of brimonidine was investigated in rabbits following topical administration. Brimonidine has been shown to lower intraocular pressure and is approved to treat glaucoma, the second leading cause of blindness in the world. We have developed IMS methods to assess transit of topically administered brimonidine from the anterior to the posterior segment of rabbit eyes. Using IMS, brimonidine was detected in the cornea, aqueous humor, iris, and posterior segments of the eye. The distribution of brimonidine suggests that the route of transit following topical administration is mainly through the uvea-scleral route. This study demonstrates that IMS can be applied to assess ocular transit and distribution of topically administered drugs.
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Affiliation(s)
- Kerri J Grove
- 1 Novartis Institutes for BioMedical Research, Emeryville, CA, USA
| | - Viral Kansara
- 2 Novartis Institutes for BioMedical Research, Cambridge, MA, USA
| | - Melissa Prentiss
- 2 Novartis Institutes for BioMedical Research, Cambridge, MA, USA
| | - Debby Long
- 2 Novartis Institutes for BioMedical Research, Cambridge, MA, USA
| | - Muneto Mogi
- 2 Novartis Institutes for BioMedical Research, Cambridge, MA, USA
| | - Sean Kim
- 2 Novartis Institutes for BioMedical Research, Cambridge, MA, USA
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7
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Arentz G, Mittal P, Zhang C, Ho YY, Briggs M, Winderbaum L, Hoffmann MK, Hoffmann P. Applications of Mass Spectrometry Imaging to Cancer. Adv Cancer Res 2017; 134:27-66. [PMID: 28110654 DOI: 10.1016/bs.acr.2016.11.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Pathologists play an essential role in the diagnosis and prognosis of benign and cancerous tumors. Clinicians provide tissue samples, for example, from a biopsy, which are then processed and thin sections are placed onto glass slides, followed by staining of the tissue with visible dyes. Upon processing and microscopic examination, a pathology report is provided, which relies on the pathologist's interpretation of the phenotypical presentation of the tissue. Targeted analysis of single proteins provide further insight and together with clinical data these results influence clinical decision making. Recent developments in mass spectrometry facilitate the collection of molecular information about such tissue specimens. These relatively new techniques generate label-free mass spectra across tissue sections providing nonbiased, nontargeted molecular information. At each pixel with spatial coordinates (x/y) a mass spectrum is acquired. The acquired mass spectrums can be visualized as intensity maps displaying the distribution of single m/z values of interest. Based on the sample preparation, proteins, peptides, lipids, small molecules, or glycans can be analyzed. The generated intensity maps/images allow new insights into tumor tissues. The technique has the ability to detect and characterize tumor cells and their environment in a spatial context and combined with histological staining, can be used to aid pathologists and clinicians in the diagnosis and management of cancer. Moreover, such data may help classify patients to aid therapy decisions and predict outcomes. The novel complementary mass spectrometry-based methods described in this chapter will contribute to the transformation of pathology services around the world.
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Affiliation(s)
- G Arentz
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia; Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, SA, Australia
| | - P Mittal
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia; Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, SA, Australia
| | - C Zhang
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia; Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, SA, Australia
| | - Y-Y Ho
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - M Briggs
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia; Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, SA, Australia; ARC Centre for Nanoscale BioPhotonics (CNBP), University of Adelaide, Adelaide, SA, Australia
| | - L Winderbaum
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - M K Hoffmann
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia; Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, SA, Australia
| | - P Hoffmann
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia; Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, SA, Australia.
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8
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Abstract
Drug analysis represents a large field in different disciplines. Plasma is commonly considered to be the biosample of choice for that purpose. However, concentrations often do not represent the levels present within deeper compartments and therefore cannot sufficiently explain efficacy or toxicology of drugs. MALDI-MS in drug analysis is of great interest for high-throughput quantification and particularly spatially resolved tissue imaging. The current perspective article will deal with challenges and opportunities of MALDI-MS drug analysis in different biological samples. A particular focus will be on hair samples. Recent applications were included, reviewed for their instrumental setup and sample preparation and pros and cons as well as future perspectives are critically discussed.
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Prentice BM, Caprioli RM. The Need for Speed in Matrix-Assisted Laser Desorption/Ionization Imaging Mass Spectrometry. POSTDOC JOURNAL : A JOURNAL OF POSTDOCTORAL RESEARCH AND POSTDOCTORAL AFFAIRS 2016; 4:3-13. [PMID: 27570788 PMCID: PMC4996283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Imaging mass spectrometry (IMS) has emerged as a powerful analytical tool enabling the direct molecular mapping of many types of tissue. Specifically, matrix-assisted laser desorption/ ionization (MALDI) represents one of the most broadly applicable IMS technologies. In recent years, advances in solid state laser technology, mass spectrometry instrumentation, computer technology, and experimental methodology have produced IMS systems capable of unprecedented data acquisition speeds (>50 pixels/second). In applications of this technology, throughput is an important consideration when designing an IMS experiment. As IMS becomes more widely adopted, continual improvements in experimental setups will be important to address biologically and clinically relevant time scales.
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Affiliation(s)
- Boone M. Prentice
- Department of Biochemistry Vanderbilt University, Nashville, TN 37232
- Department of Mass Spectrometry Research Center Vanderbilt University, Nashville, TN 37232
| | - Richard M. Caprioli
- Department of Biochemistry Vanderbilt University, Nashville, TN 37232
- Department of Chemistry Vanderbilt University, Nashville, TN 37232
- Department of Pharmacology and Medicine Vanderbilt University, Nashville, TN 37232
- Department of Mass Spectrometry Research Center Vanderbilt University, Nashville, TN 37232
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Abstract
Analysis of drug and metabolite distribution is essential for understanding of the mechanisms underlying the pharmacological or toxicological effects. MS imaging (MSI) can visualize the distribution of drugs or biological molecules in tissue sections without radiolabeling, and distinguish between the distribution of a drug and that of its metabolites in tissue sections. Therefore, it is expected to be a potent imaging technique for drug distribution studies. This article includes cases in which MSI was used to analyze drug and metabolite distribution, and discusses the impact of data obtained by MSI in drug discovery and development.
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11
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Yalcin EB, de la Monte SM. Review of matrix-assisted laser desorption ionization-imaging mass spectrometry for lipid biochemical histopathology. J Histochem Cytochem 2015. [PMID: 26209083 DOI: 10.1369/0022155415596202] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Matrix-Assisted Laser Desorption Ionization-Imaging Mass Spectrometry (MALDI-IMS) is a rapidly evolving method used for the in situ visualization and localization of molecules such as drugs, lipids, peptides, and proteins in tissue sections. Therefore, molecules such as lipids, for which antibodies and other convenient detection reagents do not exist, can be detected, quantified, and correlated with histopathology and disease mechanisms. Furthermore, MALDI-IMS has the potential to enhance our understanding of disease pathogenesis through the use of "biochemical histopathology". Herein, we review the underlying concepts, basic methods, and practical applications of MALDI-IMS, including post-processing steps such as data analysis and identification of molecules. The potential utility of MALDI-IMS as a companion diagnostic aid for lipid-related pathological states is discussed.
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Affiliation(s)
- Emine B Yalcin
- Liver Research Center, Division of Gastroenterology and Department of Medicine (EBY, SMD)
| | - Suzanne M de la Monte
- Liver Research Center, Division of Gastroenterology and Department of Medicine (EBY, SMD),Departments of Neurology, Neurosurgery, and Pathology (SMD),Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI (EBY, SMD)
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12
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Sun N, Ly A, Meding S, Witting M, Hauck SM, Ueffing M, Schmitt-Kopplin P, Aichler M, Walch A. High-resolution metabolite imaging of light and dark treated retina using MALDI-FTICR mass spectrometry. Proteomics 2014; 14:913-23. [PMID: 24459044 DOI: 10.1002/pmic.201300407] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 12/06/2013] [Accepted: 12/20/2013] [Indexed: 11/06/2022]
Abstract
MS imaging (MSI) is a valuable tool for diagnostics and systems biology studies, being a highly sensitive, label-free technique capable of providing comprehensive spatial distribution of different classes of biomolecules. The application of MSI to the study of endogenous compounds has received considerable attention because metabolites are the result of the interactions of a biosystem with its environment. MSI can therefore enhance understanding of disease mechanisms and elucidate mechanisms for biological variation. We present the in situ comparative metabolomics imaging data for analyses of light- and dark-treated retina using MALDI-FTICR. A wide variety of tissue metabolites were imaged at a high spatial resolution. These include nucleotides, central carbon metabolism pathway intermediates, 2-oxocarboxylic acid metabolism, oxidative phosphorylation, glycerophospholipid metabolism, and cysteine and methionine metabolites. The high lateral resolution enabled the differentiation of retinal layers, allowing determination of the spatial distributions of different endogenous compounds. A number of metabolites demonstrated differences between light and dark conditions. These findings add to the understanding of metabolic activity in the retina.
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Affiliation(s)
- Na Sun
- Research Unit Analytical Pathology, Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environmental Health GmbH, Neuherberg, Germany
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Abstract
To fully understand the drug mechanism of action of new chemical entities, pharmacologists need to acquire confident and precise data in pharmacokinetics and in pharmacodynamics and build strong pharmacokinetic/pharmacodynamic relationships. Target engagement in evaluating new chemical entities provides the basis for treatment efficacy. Classical technologies are sometimes limited or inefficient to provide these precise data; however, label-free MS imaging technology is able to provide these molecular features, spatial distributions, quantification and metabolomics data. Important considerations for imaging biological sections are described. Various applications in pharmacology are presented across different therapeutic areas, where MS imaging answers crucial drug discovery and preclinical development needs.
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14
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Imaging mass spectrometry by matrix-assisted laser desorption/ionization and stress-strain measurements in iontophoresis transepithelial corneal collagen cross-linking. BIOMED RESEARCH INTERNATIONAL 2014; 2014:404587. [PMID: 25276786 PMCID: PMC4167647 DOI: 10.1155/2014/404587] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Accepted: 08/14/2014] [Indexed: 11/18/2022]
Abstract
PURPOSE To compare biomechanical effect, riboflavin penetration and distribution in transepithelial corneal collagen cross-linking with iontophoresis (I-CXL), with standard cross linking (S-CXL) and current transepithelial protocol (TE-CXL). MATERIALS AND METHODS The study was divided into two different sections, considering, respectively, rabbit and human cadaver corneas. In both sections corneas were divided according to imbibition protocols and irradiation power. Imaging mass spectrometry by matrix-assisted laser desorption/ionization (MALDI-IMS) and stress-strain measurements were used. Forty-eight rabbit and twelve human cadaver corneas were evaluated. RESULTS MALDI-IMS showed a deep riboflavin penetration throughout the corneal layers with I-CXL, with a roughly lower concentration in the deepest layers when compared to S-CXL, whereas with TE-CXL penetration was considerably less. In rabbits, there was a significant increase (by 71.9% and P = 0.05) in corneal rigidity after I-CXL, when compared to controls. In humans, corneal rigidity increase was not significantly different among the subgroups. CONCLUSIONS In rabbits, I-CXL induced a significant increase in corneal stiffness as well as better riboflavin penetration when compared to controls and TE-CXL but not to S-CXL. Stress-strain in human corneas did not show significant differences among techniques, possibly because of the small sample size of groups. In conclusion, I-CXL could be a valid alternative to S-CXL for riboflavin delivery in CXL, preserving the epithelium.
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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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16
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Li X, Fei J, Lei Z, Liu K, Wu J, Meng T, Yu J, Li J. Chloroquine impairs visual transduction via modulation of acid sensing ion channel 1a. Toxicol Lett 2014; 228:200-6. [PMID: 24821433 DOI: 10.1016/j.toxlet.2014.05.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 04/29/2014] [Accepted: 05/02/2014] [Indexed: 11/29/2022]
Abstract
Acid-sensing ion channels (ASICs) are extracellular pH sensors activated by protons, which influence retinal activity and phototransduction. Among all ASICs, ASIC1a is abundantly expressed in the retina and involved in normal retinal activity. Chloroquine, which has been used in the treatment of malaria, rheumatoid arthritis and systemic lupus erythematosus, has been shown to be toxic to the retina. However, the underlying mechanisms remain unclear. In this study, we investigated the role of chloroquine in phototransduction by measuring the electroretinogram (ERG). The effect of chloroquine on acid-evoked currents in either isolated rat retinal ganglion neurons (RGNs) or Chinese hamster ovary (CHO) cells transfected with ASIC1a were assessed using a whole-cell patch-clamp technique. Chloroquine reduced the b-wave of scotopic 0.01 and photopic 3.0 and amplitudes of oscillatory potentials (OPs), an effect which was almost completely reversed by PcTx1, an ASIC1a-specific channel blocker. Further, patch-clamp experiments demonstrated that chloroquine reduced the peak current amplitude and prolonged the activation and desensitization of ASIC1a currents. These chloroquine-induced effects on the kinetics of ASIC 1a were dose-, pH- and Ca(2+)-dependent. Taken together, these results demonstrate that chloroquine affects vision conduction by directly modifying the kinetics of ASIC1a. Such a mechanism, may, in part, explain the retinal toxicity of chloroquine.
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Affiliation(s)
- Xiaoyu Li
- Institute of Physiology, Shandong Univerisity School of Medicine, 44#,Wenhua Xi Road, Jinan, Shandong, 250012 PR China
| | - Jianchun Fei
- Department of Anesthesiology, Qilu Hospital, Shandong University, 107#, Wenhua Xi Road, Jinan, 250012 PR China
| | - Zhen Lei
- Department of Anesthesiology, Qilu Hospital, Shandong University, 107#, Wenhua Xi Road, Jinan, 250012 PR China
| | - Kejing Liu
- Institute of Physiology, Shandong Univerisity School of Medicine, 44#,Wenhua Xi Road, Jinan, Shandong, 250012 PR China
| | - Jianbo Wu
- Department of Anesthesiology, Qilu Hospital, Shandong University, 107#, Wenhua Xi Road, Jinan, 250012 PR China
| | - Tao Meng
- Department of Anesthesiology, Qilu Hospital, Shandong University, 107#, Wenhua Xi Road, Jinan, 250012 PR China
| | - Jingui Yu
- Department of Anesthesiology, Qilu Hospital, Shandong University, 107#, Wenhua Xi Road, Jinan, 250012 PR China
| | - Jingxin Li
- Institute of Physiology, Shandong Univerisity School of Medicine, 44#,Wenhua Xi Road, Jinan, Shandong, 250012 PR China.
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Chatterji B, Pich A. MALDI imaging mass spectrometry and analysis of endogenous peptides. Expert Rev Proteomics 2014; 10:381-8. [PMID: 23992420 DOI: 10.1586/14789450.2013.814939] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In recent years, MALDI imaging mass spectrometry (MALDI-IMS) has developed as a promising tool to investigate the spatial distribution of biomolecules in intact tissue specimens. Ion densities of various molecules can be displayed as heat maps while preserving anatomical structures. In this short review, an overview of different biomolecules that can be analyzed by MALDI-IMS is given. Many reviews have covered imaging of lipids, small metabolites, whole proteins and enzymatically digested proteins in the past. However, little is known about imaging of endogenous peptides, for example, in the rat brain, and this will therefore be highlighted in this review. Furthermore, sample preparation of frozen or formalin-fixed, paraffin-embedded (FFPE) tissue is crucial for imaging experiments. Therefore, some aspects of sample preparation will be addressed, including washing and desalting, the choice of MALDI matrix and its deposition. Apart from mapping endogenous peptides, their reliable identification in situ still remains challenging and will be discussed as well.
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Affiliation(s)
- Bijon Chatterji
- Hannover Medical School, Institute of Toxicology, Core Unit Mass Spectrometry - Proteomics, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
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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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19
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Lietz CB, Gemperline E, Li L. Qualitative and quantitative mass spectrometry imaging of drugs and metabolites. Adv Drug Deliv Rev 2013; 65:1074-85. [PMID: 23603211 DOI: 10.1016/j.addr.2013.04.009] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Revised: 03/27/2013] [Accepted: 04/09/2013] [Indexed: 12/26/2022]
Abstract
Mass spectrometric imaging (MSI) has rapidly increased its presence in the pharmaceutical sciences. While quantitative whole-body autoradiography and microautoradiography are the traditional techniques for molecular imaging of drug delivery and metabolism, MSI provides advantageous specificity that can distinguish the parent drug from metabolites and modified endogenous molecules. This review begins with the fundamentals of MSI sample preparation/ionization, and then moves on to both qualitative and quantitative applications with special emphasis on drug discovery and delivery. Cutting-edge investigations on sub-cellular imaging and endogenous signaling peptides are also highlighted, followed by perspectives on emerging technology and the path for MSI to become a routine analysis technique.
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20
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Norris JL, Caprioli RM. Analysis of tissue specimens by matrix-assisted laser desorption/ionization imaging mass spectrometry in biological and clinical research. Chem Rev 2013; 113:2309-42. [PMID: 23394164 PMCID: PMC3624074 DOI: 10.1021/cr3004295] [Citation(s) in RCA: 509] [Impact Index Per Article: 46.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jeremy L. Norris
- National Research Resource for Imaging Mass Spectrometry, Mass Spectrometry Research Center, and Department of Biochemistry, Vanderbilt University School of Medicine, 9160 Medical Research Building III, 465 21st Avenue South, Nashville, TN 37232-8575
| | - Richard M. Caprioli
- National Research Resource for Imaging Mass Spectrometry, Mass Spectrometry Research Center, and Department of Biochemistry, Vanderbilt University School of Medicine, 9160 Medical Research Building III, 465 21st Avenue South, Nashville, TN 37232-8575
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21
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Lezmi S, Rokh N, Saint-Macary G, Pino M, Sallez V, Thevenard F, Roome N, Rosolen S. Chloroquine causes similar electroretinogram modifications, neuronal phospholipidosis and marked impairment of synaptic vesicle transport in albino and pigmented rats. Toxicology 2013; 308:50-9. [PMID: 23567313 DOI: 10.1016/j.tox.2013.03.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Revised: 02/28/2013] [Accepted: 03/25/2013] [Indexed: 01/07/2023]
Abstract
Retinal toxicity of chloroquine has been known for several years, but the mechanism(s) of toxicity remain controversial; some author support the idea that the binding of chloroquine to melanin pigments in the retinal pigmented epithelium (RPE) play a major toxic role by concentrating the drug in the eye. In our study, 12 albinos Sprague-Dawley (SD) and 12 pigmented Brown Norway (BN) rats were treated orally for 3 months with chloroquine to compare functional and pathological findings. On Flash electroretinograms (ERG) performed in scotopic conditions, similar and progressive (time-dependent) delayed onset and decreased amplitudes of oscillatory potentials (from Day 71) and b-waves (on Day 92) were identified in both BN and SD rats. In both strains, identical morphological changes consisted of neuronal phospholipidosis associated with UV auto-fluorescence without evidence of retinal degeneration and gliosis; the RPE did not show any morphological lesions or autofluorescence. IHC analyses demonstrated a decrease in GABA expression in the inner nuclear layer. In addition, a marked accumulation of synaptic vesicles coupled with a marked disruption of neurofilaments in the optic nerve fibers was identified. In conclusion, ERG observations were very similar to those described in humans. Comparable ERG modifications, histopathology and immunohistochemistry findings were observed in the retina of both rat strains suggesting that melanin pigment is unlikely involved. chloroquine-induced impairment of synaptic vesicle transport, likely related to disruption of neurofilaments was identified and non-previously reported. This new mechanism of toxicity may also be responsible for the burry vision described in humans chronically treated with chloroquine.
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Affiliation(s)
- Stéphane Lezmi
- Covance (Foremely Sanofi R&D), Toxicology Services, 2-8 route de Rouen, ZI de Limay Porcheville, 78440 Porcheville, France.
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Brignole-Baudouin F, Desbenoit N, Hamm G, Liang H, Both JP, Brunelle A, Fournier I, Guerineau V, Legouffe R, Stauber J, Touboul D, Wisztorski M, Salzet M, Laprevote O, Baudouin C. A new safety concern for glaucoma treatment demonstrated by mass spectrometry imaging of benzalkonium chloride distribution in the eye, an experimental study in rabbits. PLoS One 2012; 7:e50180. [PMID: 23209668 PMCID: PMC3507684 DOI: 10.1371/journal.pone.0050180] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 10/22/2012] [Indexed: 11/18/2022] Open
Abstract
We investigated in a rabbit model, the eye distribution of topically instilled benzalkonium_(BAK) chloride a commonly used preservative in eye drops using mass spectrometry imaging. Three groups of three New Zealand rabbits each were used: a control one without instillation, one receiving 0.01%BAK twice a day for 5 months and one with 0.2%BAK one drop a day for 1 month. After sacrifice, eyes were embedded and frozen in tragacanth gum. Serial cryosections were alternately deposited on glass slides for histological (hematoxylin-eosin staining) and immunohistological controls (CD45, RLA-DR and vimentin for inflammatory cell infiltration as well as vimentin for Müller glial cell activation) and ITO or stainless steel plates for MSI experiments using Matrix-assisted laser desorption ionization time-of-flight. The MSI results were confirmed by a round-robin study on several adjacent sections conducted in two different laboratories using different sample preparation methods, mass spectrometers and data analysis softwares. BAK was shown to penetrate healthy eyes even after a short duration and was not only detected on the ocular surface structures, but also in deeper tissues, especially in sensitive areas involved in glaucoma pathophysiology, such as the trabecular meshwork and the optic nerve areas, as confirmed by images with histological stainings. CD45-, RLA-DR- and vimentin-positive cells increased in treated eyes. Vimentin was found only in the inner layer of retina in normal eyes and increased in all retinal layers in treated eyes, confirming an activation response to a cell stress. This ocular toxicological study confirms the presence of BAK preservative in ocular surface structures as well as in deeper structures involved in glaucoma disease. The inflammatory cell infiltration and Müller glial cell activation confirmed the deleterious effect of BAK. Although these results were obtained in animals, they highlight the importance of the safety-first principle for the treatment of glaucoma patients.
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Parson WB, Koeniger SL, Johnson RW, Erickson J, Tian Y, Stedman C, Schwartz A, Tarcsa E, Cole R, Van Berkel GJ. Analysis of chloroquine and metabolites directly from whole-body animal tissue sections by liquid extraction surface analysis (LESA) and tandem mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:1420-8. [PMID: 23147817 DOI: 10.1002/jms.3068] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The rapid and direct analysis of the amount and spatial distribution of exogenous chloroquine (CHQ) and CHQ metabolites from tissue sections by liquid extraction surface sampling analysis coupled with tandem mass spectrometry (LESA-MS/MS) was demonstrated. LESA-MS/MS results compared well with previously published CHQ quantification data collected by organ excision, extraction and fluorescent detection. The ability to directly sample and analyze spatially resolved exogenous molecules from tissue sections with minimal sample preparation and analytical method development has the potential to facilitate the assessment of target tissue penetration of pharmaceutical compounds, to establish pharmacokinetic/pharmacodynamic relationships, and to complement established pharmacokinetic methods used in the drug discovery process during tissue distribution assessment.
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Affiliation(s)
- Whitney B Parson
- Organic and Biological Mass Spectrometry Group, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
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24
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Conference Report: 60th American Society for MS Conference on MS and Allied Topics. Bioanalysis 2012; 4:2109-11. [DOI: 10.4155/bio.12.196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The 60th American Society for Mass Spectrometry (ASMS) Conference on MS and Allied Topics was held in May 2012 at Vancouver in Canada. This international congress is the largest forum exclusively dedicated to MS through its diverse aspects: fundamental, method development and applications to biomolecules. This 4-day conference is also highly appreciated for discussion with the MS manufacturers presenting their latest instrumental developments.
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Prideaux B, Stoeckli M. Mass spectrometry imaging for drug distribution studies. J Proteomics 2012; 75:4999-5013. [DOI: 10.1016/j.jprot.2012.07.028] [Citation(s) in RCA: 224] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Revised: 07/15/2012] [Accepted: 07/16/2012] [Indexed: 01/13/2023]
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MALDI imaging mass spectrometry: bridging biology and chemistry in drug development. Bioanalysis 2012; 3:2427-41. [PMID: 22074284 DOI: 10.4155/bio.11.232] [Citation(s) in RCA: 188] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Our understanding of drug tissue distribution impacts a number of areas in drug development, including: pharmacology, pharmacokinetics, safety, drug-drug interactions, transport and metabolism. Despite their extensive use, autoradiography and tissue homogenate LC-MS analysis have limitations in providing a comprehensive assessment of tissue distributions. In the case of autoradiography, it is the inability to distinguish between parent drug and drug metabolites. In LC-MS analysis of tissue homogenate, all tissue localization information is lost. The emerging technique of MALDI imaging mass spectrometry has the capability to distinguish between parent and metabolites while maintaining spatial distribution in tissues. In this article, we will review the MALDI imaging MS methodology as applied to drug development and provide examples highlighting the impact of this important technique in drug development.
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Abolghasemi E, Moosa-Kazemi SH, Davoudi M, Reisi A, Satvat MT. Comparative study of chloroquine and quinine on malaria rodents and their effects on the mouse testis. Asian Pac J Trop Biomed 2012; 2:311-4. [PMID: 23569921 PMCID: PMC3609296 DOI: 10.1016/s2221-1691(12)60030-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Revised: 11/08/2011] [Accepted: 12/02/2011] [Indexed: 10/14/2022] Open
Abstract
OBJECTIVE To evaluate the effects of quinine and chloroquine against male mice infected with Plasmodium berghei and their adverse effects on the mice testes. METHODS In this study, 48 adult male mice, (20-25 g), aged 8 to 12 weeks were divided into four groups. This study was carried out from December 2009 until May 2010 in the School of Public Health, Tehran University of Medical Sciences. RESULTS The results showed that 58.33% of mice treated with chloroquine were completely recovered. Parasitemia was 4% on day 8 when compared to that on day 0, whereas it was 9% on day 9. There was no orchitis found in this group. The mortality of mice after exposing to quinine on day 5 was 8.3%, whereas from day 10 to day 14 it was 91.7%. We found 75% orchitis occurred in quinine treated group. There was a significant difference between quinine and chloroquine effects on the parasite and also mice testes (P<0.05). CONCLUSIONS In this study, It can be concluded that male mice have full resistance to the quinine. Quinine does not only make male mice recover completely, but also cause inflammation on mice testicles tissue.
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Affiliation(s)
- Esmail Abolghasemi
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Iran
| | - Seyed Hassan Moosa-Kazemi
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Iran
| | - Maryam Davoudi
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Iran
| | - Ahmad Reisi
- Department of Biostatistics and Epidemiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Taghi Satvat
- Department of Parasitology and Mycology, School of Public Health and Institute of Health Researches, Tehran University of Medical Sciences, Iran
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