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Engineered 3D Immuno-Glial-Neurovascular Human miBrain Model.

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    Biorxiv : the Preprint Server for Biology
    |August 30, 2023
    PubMed
    Summary

    Researchers developed a patient-specific brain model (miBrain) to study neurological diseases. This model revealed that the APOE4 gene variant in astrocytes promotes Alzheimer's disease pathologies, particularly tau tangles, by interacting with microglia.

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    Area of Science:

    • Neuroscience
    • Biotechnology
    • Genetics

    Background:

    • Patient-specific cellular models are crucial for understanding neurological diseases.
    • Existing models lack integrated brain components like the blood-brain barrier and immune cells.
    • There is a need for models that mimic in vivo conditions for studying diseases like Alzheimer's.

    Purpose of the Study:

    • To develop and characterize a novel multicellular integrated brain (miBrain) model.
    • To utilize the miBrain model to investigate Alzheimer's Disease (AD) pathologies linked to APOE4.
    • To elucidate the role of APOE4 in astrocyte-neuron-microglia interactions in AD.

    Main Methods:

    • Engineered a 3D hydrogel to create a biomimetic brain environment.
    • Co-cultured six major brain cell types derived from patient induced pluripotent stem cells (iPSCs).
    • Incorporated a blood-brain barrier, immune cells, and myelinated neurons into the miBrain model.

    Main Results:

    • The miBrain model exhibited in vivo-like hallmarks, including neuronal activity, barrier function, and myelin production.
    • APOE4-carrying miBrains showed increased amyloid aggregation, tau phosphorylation, and GFAP levels.
    • APOE4 in astrocytes was identified to promote tau pathogenesis and neuronal dysregulation via microglial crosstalk.

    Conclusions:

    • The miBrain model serves as a powerful tool for studying neurological diseases, including Alzheimer's.
    • APOE4's detrimental effects on neuronal health are mediated through astrocyte-microglia interactions.
    • This model advances the development of patient-specific therapies for neurological disorders.