NDLI: Visualizing spatial lipid distribution in porcine lens by MALDI imaging high-resolution mass spectrometry

Content Provider	PubMed Central
Author	Vidová, Veronika Pól, Jaroslav Michael, Volný Novák, Petr Havlíček, Vladimír Wiedmer, Susanne K. Holopainen, Juha M.
Copyright Year	2010
Abstract	The intraocular lens contains high levels of both cholesterol and sphingolipids, which are believed to be functionally important for normal lens physiology. The aim of this study was to explore the spatial distribution of sphingolipids in the ocular lens using mass spectrometry imaging (MSI). Matrix-assisted laser desorption/ionization (MALDI) imaging with ultra high resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) was used to visualize the lipid spatial distribution. Equatorially-cryosectioned, 12 μm thick slices of tissue were thaw-mounted to an indium-tin oxide (ITO) glass slide by soft-landing to an ethanol layer. This procedure maintained the tissue integrity. After the automated MALDI matrix deposition, the entire lens section was examined by MALDI MSI in a 150 μm raster. We obtained spatial- and concentration-dependent distributions of seven lens sphingomyelins (SM) and two ceramide-1-phosphates (CerP), which are important lipid second messengers. Glycosylated sphingolipids or sphingolipid breakdown products were not observed. Owing to ultra high resolution MS, all lipids were identified with high confidence, and distinct distribution patterns for each of them are presented. The distribution patterns of SMs provide an understanding of the physiological functioning of these lipids in clear lenses and offer a novel pathophysiological means for understanding diseases of the lens.
Related Links	http://dx.doi.org/10.1194/jlr.M005488
Starting Page	2295
File Format	PDF
ISSN	15397262
e-ISSN	15397262
Journal	Journal of Lipid Research
Issue Number	8
Volume Number	51
Language	English
Publisher	The American Society for Biochemistry and Molecular Biology
Publisher Date	2010-08-01
Access Restriction	Open
Rights Holder	The American Society for Biochemistry and Molecular Biology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Endocrinology

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