Abstract
The enormous abundance of lipid molecules in the central nervous system (CNS) suggests that their role is not limited to be structural and energetic components of cells. Over the last decades, some lipids in the CNS have been identified as intracellular signalers, while others are known to act as neuromodulators of neurotransmission through binding to specific receptors. Neurotransmitters of lipidic nature, currently known as neurolipids, are synthesized during the metabolism of phospholipid precursors present in cell membranes. Therefore, the anatomical identification of each of the different lipid species in human CNS by imaging mass spectrometry (IMS), in association with other biochemical techniques with spatial resolution, can increase our knowledge on the precise metabolic routes that synthesize these neurolipids and their localization. The present study shows the lipid distribution obtained by MALDI-TOF IMS in human frontal cortex, hippocampus, and striatal area, together with functional autoradiography of cannabinoid and LPA receptors. The combined application of these methods to postmortem human brain samples may be envisioned as critical to further understand neurological diseases, in general, and particularly, the neurodegeneration that accompanies Alzheimer’s disease.
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Abbreviations
- 2-AG:
-
2-Arachidonylglycerol
- AEA:
-
Anandamide
- CB:
-
Cannabinoids
- CNS:
-
Central nervous system
- eCB:
-
Endocannabinoids
- GPCR:
-
G-protein coupled receptor
- IMS:
-
Imaging mass spectrometry
- LPA:
-
Lysophosphatidic acid
- MALDI:
-
Matrix-assisted laser desorption/ionization
- MBT:
-
2-Mercaptobenzothiazole
- MS:
-
Mass spectrometry
- PC:
-
Phosphatidylcholines
- PC(O):
-
Plasmalogen
- PCA:
-
Principal component analysis
- PE:
-
Phosphatidylethanolamines
- PG:
-
Phosphatidylglycerols
- PI:
-
Phosphatidylinositols
- PLSA:
-
Probabilistic latent semantic analysis
- PS:
-
Phosphatidylserines
- PUFA:
-
Polyunsaturated fatty acids
- SF:
-
Sulfatides
- SM:
-
Sphingomyelin
- TOF:
-
Time of flight
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Acknowledgements
This study was supported by the Spanish Ministry of Education and Science (SAF2007-60211), the Basque Government (IT-325-07, IT-336-10, IT-440-10, S-PE10UN50 and SAI07/46) and Carlos III Health Institute (FIS PI070628). A. V. is recipient of a UPV/EHU graduate fellowship.
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Published in the special issue MALDI Imaging with Guest Editor Olivier Laprévote.
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Veloso, A., Fernández, R., Astigarraga, E. et al. Distribution of lipids in human brain. Anal Bioanal Chem 401, 89–101 (2011). https://doi.org/10.1007/s00216-011-4882-x
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DOI: https://doi.org/10.1007/s00216-011-4882-x