Basic Science and Pathogenesis

Area of Science:

• Neuroscience
• Proteomics
• Biochemistry

Background:

• The choroid plexus (ChP) is crucial for cerebrospinal fluid (CSF) production and maintaining central nervous system homeostasis.
• ChP dysfunction is increasingly linked to neurodegenerative disease pathogenesis.
• This study investigates ChP involvement in Alzheimer's disease (AD), Parkinson's disease (PD), and dementia with Lewy bodies (DLB) using CSF proteomics.

Purpose of the Study:

• To explore the role of choroid plexus (ChP)-expressed proteins in the pathophysiology of AD, PD, and DLB.
• To identify disease-specific protein signatures in the CSF related to ChP function.
• To understand the distinct mechanisms underlying these neurodegenerative diseases.

Main Methods:

• CSF proteomic analysis of 2902 proteins in 150 AD, 75 PD, 53 DLB patients, and 47 controls.
• Identification of proteins highly expressed in the ChP using the Allen Brain Atlas.
• Weighted Gene Co-expression Network Analysis (WGCNA) to identify protein modules and pathway enrichment analysis.

Main Results:

• 799 out of 2902 quantified proteins were highly expressed in the ChP.
• Dysregulated ChP-expressed proteins differed significantly across AD, PD, and DLB.
• WGCNA revealed distinct protein modules associated with innate immunity (decreased in AD), transcriptional/translational processes (increased in PD), and extracellular matrix (increased in DLB).

Conclusions:

• The choroid plexus (ChP) exhibits distinct protein expression patterns in AD, PD, and DLB.
• These findings highlight disease-specific roles of ChP-expressed proteins in neurodegeneration.
• Further research is needed to clarify the mechanistic involvement of the ChP in disease progression.