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Basic Science and Pathogenesis.

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The thalamus is affected early in Alzheimer's Disease (AD), impacting memory and navigation. This study identifies vulnerable cell types within the thalamus to understand its role in early AD progression.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathology

Background:

  • Alzheimer's Disease (AD) exhibits selective cellular vulnerability, with early pathology in the transentorhinal cortex, hippocampus, and cerebrum.
  • The thalamus, crucial for sensorimotor relay, memory, and navigation, is increasingly recognized as an early site of AD pathology, showing amyloid/tau deposition, atrophy, and altered connectivity.
  • Despite evidence of early thalamic involvement in AD, selective cellular vulnerability within this region remains underexplored.

Purpose of the Study:

  • To investigate selective cellular vulnerability within the thalamus in early stages of Alzheimer's Disease.
  • To identify specific thalamic cell types affected by early AD pathology.
  • To establish a foundation for understanding the thalamus's contribution to cognitive and functional decline in AD.

Main Methods:

  • Immunohistochemical profiling of postmortem brain tissue from early AD donors (Braak Stages I-IV) and controls (Braak Stage 0).
  • Sub-dissection and isolation of thalamic nuclei.
  • Fluorescence-activated nuclear sorting (FANS) to isolate specific thalamic cell types (glutamatergic TPNs, GABAergic interneurons, astrocytes, microglia, oligodendrocytes, OPCs) for bulk RNA sequencing.

Main Results:

  • Successfully isolated six distinct thalamic cell types from early AD and control brain tissue using FANS.
  • Confirmed the isolation of glutamatergic thalamic projection neurons (TPNs), GABAergic inhibitory interneurons, astrocytes, microglia, oligodendrocytes, and oligodendrocyte precursor cells (OPCs).
  • Established a methodology for comprehensive transcriptional and epigenetic profiling of cell-type specific changes in the early AD thalamus.

Conclusions:

  • Neuropathological analysis confirms early involvement of the thalamus in Alzheimer's Disease.
  • The developed dissection and sorting strategy is effective for isolating specific thalamic cell populations.
  • This approach will be instrumental in uncovering AD-related alterations in the thalamus and clarifying its role in disease progression.