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Basic Science and Pathogenesis.

Sofia Gallo Salvadori1, Gabriela Mantovani Baldasso1, Christian Limberger1

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Proteostasis

Background:

  • Alzheimer's disease (AD) is a proteinopathy marked by amyloid-β (Aβ) and hyperphosphorylated tau accumulation.
  • The ubiquitin-proteasome system is implicated in AD pathogenesis, with UCHL5 (a deubiquitinase) regulating protein degradation.
  • The specific role of UCHL5 in AD progression is not well understood.

Purpose of the Study:

  • To investigate the association between UCHL5 levels in cerebrospinal fluid (CSF).
  • To examine the relationship between CSF UCHL5 and established Alzheimer's disease biomarkers.

Main Methods:

  • Analyzed 168 cognitively unimpaired (CU) and 540 cognitively impaired (CI) individuals from the ADNI cohort.
  • Assessed CSF UCHL5 levels alongside CSF Aβ42, tau, plasma GFAP, and PET imaging (FDG-PET, Aβ-PET).
  • Utilized generalized linear mixed models and voxel-wise analyses to determine associations.

Main Results:

  • Higher CSF UCHL5 levels were observed in CU individuals compared to CI individuals.
  • In CU, UCHL5 correlated positively with p-Tau181 and total tau.
  • In CI, UCHL5 correlated positively with CSF Aβ42, plasma GFAP, MMSE, and hippocampal volume, but negatively with Aβ burden (Aβ-PET).
  • CSF UCHL5 showed a positive correlation with brain metabolism (FDG-PET).

Conclusions:

  • CSF UCHL5 levels show significant correlations with various Alzheimer's disease biomarkers (ATN system).
  • UCHL5 may play a role across different stages of AD, influencing proteinopathy and neurodegeneration.
  • Further research is required to elucidate UCHL5's precise mechanisms in AD pathogenesis.