Spatially-Resolved Exploration of the Mouse Brain
Glycome by Tissue Glyco-Capture (TGC) and Nano-LC/MS
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Abstract
Tissue glyco-capture (TGC), a highly
sensitive MS-compatible method
for extraction of glycans from tissue, was combined with structure-specific
nano-LC/MS for sensitive and detailed profiling of the mouse brain
glycome. Hundreds of glycan structures were directly detected by accurate
mass MS and structurally elucidated by MS/MS, revealing the presence
of novel glycan motifs such as antennary fucosylation, sulfation,
and glucuronidation that are potentially associated with cellular
signaling and adhesion. Microgram-level sensitivity enabled glycomic
analysis of specific regions of the brain, as demonstrated on not
only brain sections (with a one-dimensional spatial resolution of
20 μm) but also isolated brain structures (e.g., the hippocampus).
Reproducibility was extraordinarily high (<i>R</i> >
0.98)
for both method and instrumental replicates. The pairing of TGC with
structure-specific nano-LC/MS was found to be an exceptionally powerful
platform for qualitative and quantitative exploration of the brain
glycome