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Basic Science and Pathogenesis.

Kate Noseworthy1,2, Joseph Silburt1, Laura M Vecchio1

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Focused ultrasound (FUS) with microbubbles stimulates oligodendrocyte precursor cell proliferation and differentiation in mice, offering a potential new therapy for Alzheimer disease (AD) and white matter disorders.

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Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Biomedical Engineering

Background:

  • Limited treatments exist for supporting oligodendrocytes and restoring myelin in Alzheimer disease (AD).
  • Focused ultrasound (FUS) with microbubbles (MB) non-invasively increases blood-brain barrier (BBB) permeability.
  • Previous studies demonstrated FUS promotes hippocampal neurogenesis.

Purpose of the Study:

  • To evaluate the impact of FUS on oligodendrogenesis.
  • To explore FUS as a therapeutic strategy for AD by assessing its regenerative effects on myelin-producing cells.

Main Methods:

  • FUS was unilaterally targeted to the hippocampus in TgCRND8 mice (AD model) and control mice.
  • Mice received intravenous MB injections coinciding with FUS application to enhance BBB permeability.
  • Oligodendrogenesis was assessed by quantifying oligodendrocyte precursor cell (OPC) proliferation and mature oligodendrocyte numbers post-FUS.

Main Results:

  • FUS significantly increased OPC proliferation (up to 6.8-fold) and mature oligodendrocyte numbers (5.3-fold) in control mice.
  • In the presence of amyloid pathology, FUS treatment led to a 1.4-fold increase in mature oligodendrocytes.
  • A trending increase in newborn OPCs was observed in FUS-treated hippocampi at 7 days post-FUS.

Conclusions:

  • FUS stimulates oligodendrogenesis in the mouse hippocampus, even in the context of AD pathology.
  • Understanding FUS-induced oligodendrogenesis mechanisms can advance its therapeutic potential for AD.
  • FUS shows promise as a therapeutic modality for AD and other white matter diseases.