Stem-cell-derived human microglia transplanted into mouse brain to study human disease.

Area of Science:

• Neuroscience
• Stem Cell Biology
• Immunology

Background:

• Microglia play a crucial role in neurological disorders like Alzheimer's and Parkinson's disease.
• Existing methods for studying human microglia in mouse models have limitations in capturing human genetic disease aspects and cell states.
• Human microglia and stem cell-derived microglia are challenging to maintain in brain-relevant states in vitro.

Purpose of the Study:

• To present MIGRATE, a combined in vitro differentiation and in vivo xenotransplantation protocol for studying human microglia in the mouse brain.
• To provide a detailed, step-by-step workflow for human microglia generation, transplantation, and engraftment analysis.
• To offer an optimized, faster, and more efficient alternative to current protocols for human microglia xenotransplantation.

Main Methods:

• Human induced pluripotent stem cells (PSCs) differentiation into microglia.
• Xenotransplantation of differentiated human microglia into the mouse brain.
• Quantitative analysis of microglia engraftment using flow cytometry or immunohistochemistry.

Main Results:

• The MIGRATE protocol enables the study of human microglia within the mouse brain microenvironment.
• Achieved up to 80% chimerism, indicating high engraftment efficiency.
• Provides a faster and more efficient approach compared to existing protocols, with a total duration of approximately 40 days.

Conclusions:

• MIGRATE offers a robust and efficient method for generating and xenotransplanting human microglia.
• This protocol facilitates advanced research into human microglia function in neurological diseases within a relevant in vivo context.
• The improved efficiency and speed of MIGRATE advance the study of human microglia in complex neurological disorders.