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Basic Science and Pathogenesis.

Kristina Fredriksen1, Siddhi S Joshi1, Minwoo Kim1

  • 1University of Minnesota, Minneapolis, MN, USA.

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HDL mimetic peptide 4F and the APOE Christchurch mutation enhance apolipoprotein E (APOE) secretion and lipidation in astrocytes, mitigating Alzheimer's disease (AD) risk factors. These findings suggest potential therapeutic strategies for AD.

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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Apolipoprotein E (APOE) is a major genetic risk factor for Alzheimer's disease (AD), with APOE4 increasing risk.
  • APOE lipidation is crucial for lipid homeostasis and Aβ clearance; APOE4 exhibits poor lipidation compared to other isoforms.
  • Emerging therapies aim to restore APOE4 lipidation to levels seen in protective isoforms.

Purpose of the Study:

  • To investigate the effects of the HDL mimetic peptide 4F and the protective APOE Christchurch (APOEch) mutation on APOE4 astrocytes.
  • To determine if these interventions can enhance APOE secretion and lipidation, and rescue E4-related deficits.

Main Methods:

  • Generated APOE4 Christchurch (E4ch) induced pluripotent stem cells (iPSCs) and knock-in (KI) mice.
  • Differentiated isogenic iPSCs and isolated primary astrocytes from E4 and E4ch KI mice.
  • Treated astrocytes with aggregated Aβ42 and/or peptide 4F, followed by biochemical analyses of APOE secretion and lipidation.

Main Results:

  • E4ch astrocytes showed enhanced APOE secretion and lipidation compared to E4 astrocytes.
  • E4ch astrocytes maintained APOE secretion and lipidation in the presence of Aβ42 and promoted lysosomal clearance.
  • Peptide 4F counteracted Aβ42 inhibition, enhancing APOE secretion and lipidation in both primary and iPSC astrocytes.

Conclusions:

  • HDL mimetic peptide 4F treatment mimics protective APOEch effects, mitigating E4-related deficits in astrocytes.
  • Targeting APOE secretion and lipidation presents a promising therapeutic strategy for sporadic Alzheimer's disease.