Device-Controlled Microcondensation for Spatially Confined On-Tissue Digests in MALDI Imaging of N-Glycans

Fülöp, Annabelle and Marsching, Christian and Barka, Frederik and Ucal, Yasemin and Pfänder, Pauline and Opitz, Christiane A. and Barka, Günes and Hopf, Carsten (2022) Device-Controlled Microcondensation for Spatially Confined On-Tissue Digests in MALDI Imaging of N-Glycans. Pharmaceuticals, 15 (11). p. 1356. ISSN 1424-8247

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Abstract

On-tissue enzymatic digestion is a prerequisite for MALDI mass spectrometry imaging (MSI) and spatialomic analysis of tissue proteins and their N-glycan conjugates. Despite the more widely accepted importance of N-glycans as diagnostic and prognostic biomarkers of many diseases and their potential as pharmacodynamic markers, the crucial sample preparation step, namely on-tissue digestion with enzymes like PNGaseF, is currently mainly carried out by specialized laboratories using home-built incubation arrangements, e.g., petri dishes placed in an incubator. Standardized spatially confined enzyme digests, however, require precise control and possible regulation of humidity and temperature, as high humidity increases the risk of analyte dislocation and low humidity compromises enzyme function. Here, a digestion device that controls humidity by cyclic ventilation and heating of the slide holder and the chamber lid was designed to enable controlled micro-condensation on the slide and to stabilize and monitor the digestion process. The device presented here may help with standardization in MSI. Using sagittal mouse brain sections and xenografted human U87 glioblastoma cells in CD1 nu/nu mouse brain, a device-controlled workflow for MALDI MSI of N-glycans was developed.

Item Type: Article
Uncontrolled Keywords: MALDI MSI; N-glycans; enzymatic digestion; micro-condensation; standardization
Subjects: Institute Archives > Medical Science
Depositing User: Managing Editor
Date Deposited: 07 Nov 2022 07:46
Last Modified: 25 Aug 2023 05:50
URI: http://eprint.subtopublish.com/id/eprint/59

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