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Basic Science and Pathogenesis.

Huan Li1,2, Theodore J Zwang1,2, Alberto Serrano-Pozo1,2

  • 1Massachusetts General Hospital, Boston, MA, USA.

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Summary
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Alzheimer's disease (AD) involves layer 2/3 (L2/3) neuron loss. This study reveals key microglial and astrocyte interactions linked to L2/3 neuron loss in AD, highlighting complex cell communication in neurodegeneration.

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Area of Science:

  • Neuroscience
  • Genomics
  • Cell Biology

Background:

  • Alzheimer's disease (AD) is characterized by significant neocortical layer 2/3 (L2/3) neuronal loss, correlating with pTau and neurofibrillary tangles.
  • While single-nucleus studies explored p-Tau mechanisms in L2/3 neurons, the role of non-neuronal cells remains largely unknown.
  • This study addresses the gap by analyzing cell-cell communication using single nucleus RNA-Seq (snRNA-Seq) and spatial transcriptomics data.

Purpose of the Study:

  • To investigate cell-cell interactions between L2/3 neurons and non-neuronal cells (microglia and astrocytes) in Alzheimer's disease.
  • To identify specific ligand-receptor pairs involved in L2/3 neuronal loss and their correlation with AD neuropathology.
  • To integrate snRNA-Seq and spatial transcriptomics to understand the contribution of non-neuronal cells to AD pathogenesis.

Main Methods:

  • Conducted cell-cell interaction analysis using LIANA on snRNA-Seq data from 32 donors across the AD continuum.
  • Focused on interactions between L2/3 neurons, astrocytes, and microglia in the inferior temporal gyrus (ITG).
  • Utilized spatial transcriptomics for preliminary analysis of interaction specificity in L2/3 neurons in an AD donor.

Main Results:

  • L2/3 neurons showed significant interactions with microglia subclusters mic.1 (antigen presentation, complement) and mic.7 (cytokine response).
  • APOE expression in mic.1 correlated positively with pTau and negatively with L2/3 neuron proportion; LRP1 in L2/3 neurons showed similar correlations.
  • SEMA3D-PLXND1 signaling between astrocytes and L2/3 neurons correlated with pTau and L2/3 neuron loss, though SEMA3D was not layer-specific.

Conclusions:

  • Integrative analysis revealed critical ligand-receptor interactions with microglia and astrocytes associated with L2/3 neuron loss in AD.
  • Findings highlight the significant role of APOE and SEMA3D-PLXND1 pathways in AD-related neurodegeneration.
  • Emphasizes the complex interplay between neuronal and non-neuronal cells in the pathogenesis of Alzheimer's disease.