Direct imaging of single cells and tissue at sub-cellular spatial resolution using transmission geometry MALDI MS.

Zavalin A, Todd EM, Rawhouser PD, Yang J, Norris JL, Caprioli RM
J Mass Spectrom. 2012 47 (11): 1473-81

PMID: 23147824 · DOI:10.1002/jms.3108

The need of cellular and sub-cellular spatial resolution in laser desorption ionization (LDI)/matrix-assisted LDI (MALDI) imaging mass spectrometry (IMS) necessitates micron and sub-micron laser spot sizes at biologically relevant sensitivities, introducing significant challenges for MS technology. To this end, we have developed a transmission geometry vacuum ion source that allows the laser beam to irradiate the back side of the sample. This arrangement obviates the mechanical/ion optic complications in the source by completely separating the optical lens and ion optic structures. We have experimentally demonstrated the viability of transmission geometry MALDI MS for imaging biological tissues and cells with sub-cellular spatial resolution. Furthermore, we demonstrate that in conjunction with new sample preparation protocols, the sensitivity of this instrument is sufficient to obtain molecular images at sub-micron spatial resolution.

Copyright © 2012 John Wiley & Sons, Ltd.

MeSH Terms (14)

Animals Brain Chemistry Equipment Design HEK293 Cells Histological Techniques Humans Lipids Mice Molecular Imaging Proteins Reproducibility of Results Sensitivity and Specificity Single-Cell Analysis Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization

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