Corpora amylacea profiling reveals disease stage and brain region-specific alterations in glycogen metabolism in Alzheimer’s disease patient brains
Summary Increasing evidence indicates that shifts in brain polysaccharide metabolism can influence the progression of multiple neurodegenerative diseases. Here, we profile corpora amylacea (CA) in 230 postmortem human brains, revealing significantly higher densities in Alzheimer’s disease (AD) patients when compared with patients with other or no neurodegenerative diseases and a tight correlation of CA density with neurofibrillary tangle (NFT) pathology. Immunohistochemical profiling using an anti-glycogen antibody confirms the polysaccharide nature of CA and reveals plaque-like glycogen patches (GPs) and densely aggregated intraneuronal glycogen in AD patient brains correlated with the emergence of NFT pathology. matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) orthogonally verifies the polysaccharide identity of these structures and that GPs can be consistently observed at early neuropathological disease stages. GPs are also observed in murine models of AD-like pathology, correlating with tau pathology. The identification of these AD-associated glycogen pathologies in the human brain implies that alterations in glycogen metabolism are tightly associated with AD pathogenesis.