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Alzheimer's Imaging Consortium.

Xianwei Sun1, Andrew A Badachhape1, Terry-Elinor Reid2

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Summary
This summary is machine-generated.

We developed novel MRI-sensitive liposomes targeting CSF1-R to image neuroinflammation in Alzheimer's and Parkinson's disease models. This technique precisely delivers diagnostic and potentially therapeutic payloads to activated microglia.

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Area of Science:

  • Neuroscience
  • Biotechnology
  • Medical Imaging

Background:

  • Microglia-mediated neuroinflammation is central to neurodegenerative diseases like Alzheimer's (AD) and Parkinson's (PD).
  • CSF1-R signaling drives microglial activation, proliferation, and survival, with its upregulation observed in AD.
  • Current in vivo imaging for reactive microgliosis is lacking, hindering diagnosis and treatment monitoring.

Purpose of the Study:

  • To develop a novel molecular imaging technique for neuroinflammation by targeting CSF1-R.
  • To create MRI-sensitive liposomes for in vivo profiling of reactive microgliosis.
  • To assess the diagnostic potential for neurodegenerative disorders.

Main Methods:

  • Formulated liposomes with Caflanone (CSF1-R ligand) and Gd(III) DSPE-DOTA (MRI contrast agent).
  • Validated receptor-mediated nanoparticle uptake in human and mouse microglia cell lines.
  • Conducted in vivo MRI studies in AD (APP/PSEN1, P301S) and PD (A53TαS Tg) mouse models, with ex vivo immunohistochemical analysis.

Main Results:

  • In vitro assays confirmed Caflanone-labeled nanoparticle internalization via receptor-mediated endocytosis.
  • In vivo MRI showed enhanced brain retention of nanoparticles in transgenic mice compared to wild-type controls.
  • Ex vivo analysis revealed nanoparticle localization within activated microglia surrounding amyloid-β plaques in an AD model.

Conclusions:

  • Demonstrated precise delivery of Caflanone-liposomes with MRI payload to activated microglia in multiple neurodegenerative disease models.
  • These nanoparticles show potential for developing novel diagnostics for neuroinflammation.
  • The platform offers a new avenue for developing both diagnostics and therapeutics for neuroinflammatory conditions.