Modeling Neurodegenerative Microenvironment Using Cortical Organoids Derived from Human Stem Cells.

Area of Science:

• Neuroscience
• Stem Cell Biology
• Biochemistry

Background:

• Alzheimer's disease (AD) is a leading cause of neurodegeneration, marked by cognitive and memory deficits.
• Current understanding of AD mechanisms is limited by the lack of suitable human brain models.
• Human induced pluripotent stem cell (hiPSC)-derived organoids offer a novel platform for studying neurological diseases.

Purpose of the Study:

• To model and characterize the neural degeneration microenvironment in Alzheimer's disease using 3D forebrain cortical organoids.
• To investigate the response of these organoids to specific drug treatments relevant to AD pathology.
• To test the hypothesis that AD-patient derived organoids can recapitulate the extracellular microenvironment changes in neural degeneration.

Main Methods:

• Generation of 3D forebrain cortical organoids from hiPSCs of AD patients with presenilin-1 mutations.
• Analysis of AD-related inflammatory responses, matrix remodeling, and extracellular microenvironment changes.
• Investigation of organoid responses to treatments including DAPT, heparin, and heparinase.

Main Results:

• AD-derived organoids exhibited significantly higher levels of amyloid-beta 42 (Aβ42) compared to healthy controls.
• Elevated gene expression of pro-inflammatory cytokines (interleukin-6 and tumor necrosis factor-α) was observed in AD organoids.
• Upregulation of syndecan-3 and altered matrix remodeling protein expression were detected in the AD organoid model.

Conclusions:

• hiPSC-derived cortical organoids effectively model extracellular microenvironment changes characteristic of Alzheimer's disease.
• This organoid model provides a valuable platform for studying AD pathogenesis and for screening potential therapeutic drugs.
• The study highlights the potential of 3D organoid systems for advancing Alzheimer's disease research.