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Basic Science and Pathogenesis.

Chinaza Lilian Dibia1,2, Nathalie Vacaresse2, Rikke Han Kofoed3

  • 1University of Toronto, Toronto, ON, Canada.

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Summary

This study shows that the glial fibrillary acidic protein (GFAP) promoter can regulate gene therapy in Alzheimer's disease models. This approach leverages reactive astrocytes to control therapeutic antibody production for potential brain-wide treatment.

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Area of Science:

  • Neuroscience
  • Gene Therapy
  • Alzheimer's Disease Research

Background:

  • Recombinant adeno-associated viruses (AAVs) like AAV.PHP.eB can cross the blood-brain barrier.
  • Antibodies targeting amyloid beta peptides (Aβ) are investigated for Alzheimer's disease (AD) gene immunotherapy.
  • Glial fibrillary acidic protein (GFAP) promoter activity increases with Aβ pathology, offering a potential regulatory mechanism.

Purpose of the Study:

  • To determine if reactive astrocytes can regulate anti-Aβ antibody expression using the GFAP promoter.
  • To assess the efficacy of AAV-mediated gene delivery and GFAP promoter function in a mouse model of amyloidosis.

Main Methods:

  • Quantified GFAP mRNA levels in TgCRND8 (Tg) mice at different ages using qPCR.
  • Co-injected AAV vectors encoding an anti-Aβ antibody (rSol) or GFP under the GFAP promoter into Tg mice.
  • Analyzed brain sections using immunohistochemistry and RNAscope to assess gene expression and transduction.

Main Results:

  • GFAP mRNA levels increased with age in Tg mice.
  • Brain-wide GFP expression confirmed GFAP promoter activity in astrocytes.
  • Transduction efficiency varied among Tg mice, potentially due to Ly6A protein levels influencing AAV.PHP.eB entry.

Conclusions:

  • The GFAP promoter can potentially control therapeutic production in response to amyloid-induced astrocytic reactivity.
  • Further long-term studies are needed to evaluate if rSol can prevent Aβ pathology progression in AD mouse models.