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Basic Science and Pathogenesis.

Stefano Sorrentino1, Declan J Brennan1, Stefan Wendt1

  • 1University of British Columbia, Vancouver, BC, Canada.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 24, 2025
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Summary
This summary is machine-generated.

Researchers created a 3D bioprinted human brain model to study Alzheimer's disease (AD) amyloidogenesis. This novel model successfully mimics amyloid plaque formation, offering a new tool for AD research and drug discovery.

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Area of Science:

  • Neuroscience
  • Biotechnology
  • Stem Cell Biology

Background:

  • Amyloid beta (Aβ) aggregation is central to Alzheimer's disease (AD) pathology, but its mechanisms are poorly understood due to limitations in current research models.
  • Traditional 2D cultures and in vivo models fail to fully replicate human Aβ aggregation dynamics and neurotoxicity.
  • 3D bioprinting offers a promising approach to create physiologically relevant human brain models using human induced pluripotent stem cells (hiPSCs) and biomaterials.

Purpose of the Study:

  • To develop a 3D bioprinted human brain model capable of recapitulating amyloidogenesis.
  • To investigate the formation and accumulation of amyloid beta plaques in a human-relevant in vitro system.
  • To provide a novel platform for studying Alzheimer's disease mechanisms and facilitating drug discovery.

Main Methods:

  • Development of a 3D bioprinted human brain model using iPSC-derived cortical neurons, astrocytes, and microglia in a multilayer structure.
  • Incorporation of synthetic fibrillar Aβ42 (fAβ42) into the bioink to induce and study amyloid plaque formation.
  • Long-term culture and analysis of Aβ aggregation dynamics and deposition within the 3D constructs.

Main Results:

  • Statistically significant decrease in endogenous Aβ40 and Aβ42 levels in conditioned medium, indicating increased aggregation.
  • Confirmation of increased Aβ deposit accumulation within the 3D-printed constructs via immunostaining (mOC87 and 4G8 positive).
  • Successful long-term culture and observation of amyloidogenesis in a human-derived 3D brain model.

Conclusions:

  • The 3D bioprinted human brain model effectively mimics amyloidogenesis, overcoming limitations of conventional in vitro models.
  • This human-relevant platform enables real-time study of Aβ nucleation and plaque formation.
  • The model serves as a novel tool for Alzheimer's disease research and drug discovery, reducing reliance on animal models.