Proteomics of the astrocyte secretome reveals changes in their response to soluble oligomeric Aβ

Vittoria Matafora, Alena Gorb, Fangjia Yang, Wendy Noble, Angela Bachi, Beatriz Gomez Perez-Nievas, Maria Jimenez-Sanchez

Research output: Contribution to journalArticlepeer-review

Abstract

Astrocytes associate with amyloid plaques in Alzheimer's disease (AD). Astrocytes react to changes in the brain environment, including increasing concentrations of amyloid-β (Aβ). However, the precise response of astrocytes to soluble small Aβ oligomers at concentrations similar to those present in the human brain has not been addressed. In this study, we exposed astrocytes to media from neurons that express the human amyloid precursor protein (APP) transgene with the double Swedish mutation (APPSwe), and which contains APP-derived fragments, including soluble human Aβ oligomers. We then used proteomics to investigate changes in the astrocyte secretome. Our data show dysregulated secretion of astrocytic proteins involved in the extracellular matrix and cytoskeletal organization and increase secretion of proteins involved in oxidative stress responses and those with chaperone activity. Several of these proteins have been identified in previous transcriptomic and proteomic studies using brain tissue from human AD and cerebrospinal fluid (CSF). Our work highlights the relevance of studying astrocyte secretion to understand the brain response to AD pathology and the potential use of these proteins as biomarkers for the disease.

Original languageEnglish
Pages (from-to)346-366
Number of pages21
JournalJournal of Neurochemistry
Volume166
Issue number2
DOIs
Publication statusPublished - 1 Jul 2023

Keywords

  • Humans
  • Astrocytes/metabolism
  • Proteomics
  • Secretome
  • Amyloid beta-Peptides/metabolism
  • Alzheimer Disease/metabolism
  • Amyloid beta-Protein Precursor/metabolism

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