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Basic Science and Pathogenesis.

Roy Lardenoije1, Angela R S Kruse2, Lukasz G Migas1

  • 1Delft University of Technology, Delft, Zuid-Holland, Netherlands.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
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Summary
This summary is machine-generated.

Amyloid deposits in the brain and pancreas affect nearby cells and gene expression. Researchers found shared genes linked to amyloid proximity, suggesting common pathways in Alzheimer's disease and type 2 diabetes.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Cell Biology

Background:

  • Amyloid pathology, common in Alzheimer's disease (AD) and type 2 diabetes (T2D), impacts cellular environments.
  • T2D is a frequent comorbidity of AD, suggesting shared pathophysiological processes.

Purpose of the Study:

  • To compare cellular and transcriptomic responses to amyloid pathology in the AD brain and T2D pancreas.
  • To identify shared molecular pathways between AD and T2D.

Main Methods:

  • Xenium single-cell spatial transcriptomics on human post-mortem AD brain and T2D pancreas tissues.
  • Integration of transcriptomic data with amyloid histopathology to assess cell proximity.
  • Analysis of cell type composition and differential gene expression relative to amyloid deposits.

Main Results:

  • Increased microglia near brain amyloid; increased macrophages and activated stellate cells near pancreatic amyloid.
  • Differential gene expression observed in astrocytes, microglia, oligodendrocytes, endothelial cells (brain), and acinar, alpha, activated stellate cells (pancreas).
  • 16 shared differentially expressed genes identified across both organs, including CAV1, CXCR4, MS4A6A, SNCG, and SOX2.

Conclusions:

  • Spatial analysis reveals amyloid deposits alter cellular and transcriptomic microenvironments in both brain and pancreas.
  • Identification of shared genes differentially expressed near amyloid deposits suggests common pathological mechanisms in AD and T2D.