Optimized Method to Generate Well-Characterized Macrophages from Induced Pluripotent Stem Cells

Area of Science:

• Stem cell biology
• Immunology
• Cellular differentiation

Background:

• Macrophages are crucial in pathogenesis, requiring efficient production methods.
• Current methods using peripheral blood monocytes have limitations in yield and gene editing potential.
• Induced pluripotent stem cells (iPSCs) offer a promising alternative source for macrophage generation.

Purpose of the Study:

• To establish a robust and reproducible method for differentiating iPSCs into macrophages.
• To achieve high yields of iPSC-derived macrophages suitable for research and gene editing.
• To characterize the functional and molecular properties of these iPSC-derived macrophages.

Main Methods:

• A novel three-phase differentiation strategy using microwell plates and cell filtration was developed.
• Macrophage function assays included lipoprotein uptake, phagocytosis, cytokine release, and inflammasome activation.
• RNA sequencing was employed to analyze differentiation stages, donor variability, and identify marker genes.

Main Results:

• iPSC-derived macrophages exhibited characteristic features, marker proteins, and classical macrophage functions.
• M1-like and M2-like polarization effects on cytokine release were successfully demonstrated.
• RNA sequencing confirmed clear clustering by differentiation stage and identified donor-specific clustering and stage-specific marker genes.

Conclusions:

• The developed method provides an optimized and simplified procedure for producing iPSC-derived macrophages.
• This reproducible method generates high-quality macrophages.
• The iPSC-derived macrophages are suitable for diverse biomedical applications, including gene editing.