Volume 58, Issue 10 pp. 3156-3161
Communication

Secondary-Ion Mass Spectrometry Images Cardiolipins and Phosphatidylethanolamines at the Subcellular Level

Dr. Hua Tian

Corresponding Author

Dr. Hua Tian

Department of Chemistry, Pennsylvania State University, 209 Chemistry Bldg., University Park, PA, 16802 USA

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Dr. Louis J. Sparvero

Dr. Louis J. Sparvero

Department of Environmental and Occupational Health and Center for Free Radical and Antioxidant Health, University of Pittsburgh, USA

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Paul Blenkinsopp

Paul Blenkinsopp

Ionoptika Ltd., Unit B6, Millbrook Cl, Chandler's Ford, Eastleigh, SO53 4BZ UK

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Dr. Andrew A. Amoscato

Dr. Andrew A. Amoscato

Department of Environmental and Occupational Health and Center for Free Radical and Antioxidant Health, University of Pittsburgh, USA

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Prof. Simon C. Watkins

Prof. Simon C. Watkins

Department of Cell Biology, University of Pittsburgh, USA

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Prof. Hülya Bayır

Corresponding Author

Prof. Hülya Bayır

Department of Chemistry, Pennsylvania State University, 209 Chemistry Bldg., University Park, PA, 16802 USA

Departments of Environmental and Occupational Health, Radiation Oncology, Critical Care Medicine, Center for Free Radical and Antioxidant Health and Safar Center for Resuscitation Research, University of Pittsburgh, USA

Children's Neuroscience Institute, UPMC Children's Hospital, University of Pittsburgh, 4200 Fifth Ave, Pittsburgh, PA, 15260 USA

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Prof. Valerian E. Kagan

Corresponding Author

Prof. Valerian E. Kagan

Department of Chemistry, Pennsylvania State University, 209 Chemistry Bldg., University Park, PA, 16802 USA

Departments of Environmental and Occupational Health, Chemistry, Radiation Oncology, Center for Free Radical and Antioxidant Health, University of Pittsburgh, USA

Laboratory of Navigational Redox Lipidomics, IM Sechenov Moscow Medical State University, Russia

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Prof. Nicholas Winograd

Corresponding Author

Prof. Nicholas Winograd

Department of Chemistry, Pennsylvania State University, 209 Chemistry Bldg., University Park, PA, 16802 USA

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First published: 24 January 2019
Citations: 63

Graphical Abstract

Beam me up: A high-energy gas-cluster ion beam (GCIB) with 1 μm lateral resolution was developed. This allowed single cell and subcellular mass spectrometry imaging of diverse phospholipids, including cardiolipin (CL) and phosphatidylethanolamine (PE). Coupling this with immunohistochemistry provided assessments in specific subcellular compartments.

Abstract

Millions of diverse molecules constituting the lipidome act as important signals within cells. Of these, cardiolipin (CL) and phosphatidylethanolamine (PE) participate in apoptosis and ferroptosis, respectively. Their subcellular distribution is largely unknown. Imaging mass spectrometry is capable of deciphering the spatial distribution of multiple lipids at subcellular levels. Here we report the development of a unique 70 keV gas-cluster ion beam that consists of (CO2)n+(n>10 000) projectiles. Coupled with direct current beam buncher-time-of-flight secondary-ion mass spectrometry, it is optimized for sensitivity towards high-mass species (up to m/z 3000) at high spatial resolution (1 μm). In combination with immunohistochemistry, phospholipids, including PE and CL, have been assessed in subcellular compartments of mouse hippocampal neuronal cells and rat brain tissue.

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