Single transcription factor efficiently leads human induced pluripotent stem cells to functional microglia

Area of Science:

• Neuroscience
• Stem Cell Biology
• Immunology

Background:

• Microglia are key innate immune cells in the central nervous system.
• Their dysfunction is linked to neurodegenerative diseases.
• Understanding microglia is crucial for treating these conditions.

Purpose of the Study:

• To develop a robust protocol for generating human microglia from induced pluripotent stem cells (hiPSCs).
• To enhance the efficiency of microglial differentiation.
• To investigate the functions of these hiPSC-derived microglia (hiMGLs).

Main Methods:

• Established a novel protocol using cytokines and small chemicals for hiPSC differentiation into microglia.
• Enhanced differentiation by forcing PU.1 transcription factor expression.
• Characterized hiMGLs using specific markers, transcriptome analysis, and functional assays.

Main Results:

• Generated hiMGLs with ~120-fold increase compared to previous methods.
• Over 90% of hiMGLs expressed microglia markers (CX3CR1, IBA-1).
• hiMGLs exhibited physiological functions (LPS response, phagocytosis, inflammasome) and regulated neuron activity.

Conclusions:

• Developed a simple, rapid, and highly efficient method for hiPSC-derived microglia generation.
• This method is valuable for studying microglia in health and disease.
• Facilitates drug discovery for neurological disorders.