A Highly Efficient Human Pluripotent Stem Cell Microglia Model Displays a Neuronal-Co-culture-Specific Expression
Walther Haenseler1, Stephen N Sansom2, Julian Buchrieser1
1Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK.
Abstract:
Microglia are increasingly implicated in brain pathology, particularly neurodegenerative disease, with many genes implicated in Alzheimer's, Parkinson's, and motor neuron disease expressed in microglia. There is, therefore, a need for authentic, efficient in vitro models to study human microglial pathological mechanisms. Microglia originate from the yolk sac as MYB-independent macrophages, migrating into the developing brain to complete differentiation. Here, we recapitulate microglial ontogeny by highly efficient differentiation of embryonic MYB-independent iPSC-derived macrophages then co-culture them with iPSC-derived cortical neurons. Co-cultures retain neuronal maturity and functionality for many weeks. Co-culture microglia express key microglia-specific markers and neurodegenerative disease-relevant genes, develop highly dynamic ramifications, and are phagocytic. Upon activation they become more ameboid, releasing multiple microglia-relevant cytokines. Importantly, co-culture microglia downregulate pathogen-response pathways, upregulate homeostatic function pathways, and promote a more anti-inflammatory and pro-remodeling cytokine response than corresponding monocultures, demonstrating that co-cultures are preferable for modeling authentic microglial physiology.
Insights
This study develops an improved in vitro model for human microglia, crucial for understanding neurodegenerative diseases like Alzheimer's. The co-culture system better mimics authentic microglial physiology and function.
Area of Science:
- Neuroscience
- Cell Biology
- Stem Cell Research
Background:
- Microglia are key players in brain pathology, especially neurodegenerative diseases.
- Existing in vitro models lack authenticity for studying human microglial mechanisms.
- Microglial ontogeny involves yolk sac-derived macrophages migrating to the brain.
Purpose of the Study:
- To create an efficient and authentic in vitro model of human microglia.
- To study microglial behavior in a physiologically relevant context.
- To investigate microglial roles in neurodegenerative disease mechanisms.
Main Methods:
- Reprecipitated microglial ontogeny using induced pluripotent stem cell (iPSC)-derived macrophages.
- Co-cultured iPSC-derived macrophages with iPSC-derived cortical neurons.
- Analyzed microglial markers, gene expression, morphology, and cytokine release.
Main Results:
- Co-cultures maintained neuronal maturity and function for extended periods.
- Co-cultured microglia expressed specific markers and disease-relevant genes.
- Activated microglia exhibited ameboid morphology and released cytokines.
- Co-culture microglia showed downregulated pathogen-response and upregulated homeostatic pathways.
Conclusions:
- The iPSC-derived co-culture model authentically recapitulates human microglial physiology.
- This model is superior to monocultures for studying homeostatic and anti-inflammatory microglial functions.
- The model provides a valuable tool for neurodegenerative disease research.
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