Subcellular localisation of cholesterol and phosphocholine with pattern-recognition-imaging-TOF-SIMS

• Molecular ions of cholesterol, and its fragments, and phosphocholine fragments of phospholipids, were localized in single cells with a resolution of 7000 or high lateral resolution. High mass resolution spectra were recorded on reference samples of pure cholesterol and phosphatidylcholine. Characteristic fragment peaks and the silver cationised quasimolecular ion [M+Ag]+ were selected as a pattern for the identification of the lipids in TOF-SIMS images of surface-adhering leukocytes. The localisation of membrane lipids showed lateral heterogeneity over the cell surface.

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