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Basic Science and Pathogenesis.

Dominique Leitner1, Chenyang Li1, Huize Pang1

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This study investigated choroid plexus (ChP) changes in Alzheimer's disease (AD) using MRI, neuropathology, and proteomics. Findings reveal molecular alterations in the ChP, offering insights into AD mechanisms and potential biomarkers.

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Area of Science:

  • Neuroscience
  • Pathology
  • Biochemistry

Background:

  • The choroid plexus (ChP) is crucial for brain homeostasis, producing cerebrospinal fluid (CSF) and clearing waste.
  • Age and Alzheimer's disease (AD) are associated with ChP changes like increased size and vascular degeneration.
  • Previous proteomic studies in severe AD showed altered cell energy metabolism in the ChP.

Purpose of the Study:

  • To characterize ChP alterations in AD using histopathology and proteomics.
  • To investigate blood-CSF barrier integrity, vascular changes, and Aβ/tau accumulation in the ChP.
  • To identify molecular mechanisms underlying ChP changes in AD.

Main Methods:

  • Choroid plexus (ChP) evaluation via MRI, neuropathology, and quantitative mass spectrometry.
  • Neuropathological assessment included markers for Aβ, tau, endothelium (CD31), epithelium (AQP1), and basement membrane (COL4).
  • Proteomic analysis of microdissected ChP tissue from AD and control cases.

Main Results:

  • Proteomics identified significant protein differences across the AD continuum, including novel proteins.
  • Functional analysis via gene ontology (GO) enrichment revealed associations with altered proteins.
  • Histological characterization confirmed top protein candidates and correlated findings with clinical history.

Conclusions:

  • Initial characterization of the ChP in AD using MRI, neuropathology, and proteomics was performed.
  • Identified proteomic differences in the AD choroid plexus provide insights into molecular mechanisms.
  • Results suggest potential for novel diagnostic biomarkers and therapeutic strategies for AD.