Development and function of human innate immune cells in a humanized mouse model

Area of Science:

• Immunology
• Hematology
• Genetics

Background:

• Humanized mice are crucial for studying human hematopoiesis and immunity in vivo.
• Existing models fail to support human innate immune cell development, limiting their utility.
• Innate immune cells like myeloid and NK cells are vital for immune responses.

Purpose of the Study:

• To develop novel humanized mouse models supporting human innate immune cell development.
• To investigate the function of human myeloid and NK cells in vivo.
• To establish a platform for studying human immune responses and diseases.

Main Methods:

• Developed MITRG and MISTRG mouse strains by knocking in human cytokine genes.
• Repopulated mice with human fetal liver or adult CD34(+) progenitor cells.
• Assessed the development and function of human myeloid and NK cells.
• Evaluated macrophage infiltration in human tumor xenografts.

Main Results:

• MITRG and MISTRG mice successfully supported the development and function of human monocytes, macrophages, and NK cells.
• Human macrophages exhibited infiltration patterns in xenografts similar to human patients.
• The human cytokines promoted robust innate immune cell engraftment and function.

Conclusions:

• MITRG and MISTRG mice represent a significant advancement in humanized mouse models for immunology.
• These models can effectively recapitulate human innate immune cell behavior in vivo.
• The models offer a valuable platform for studying human health, pathology, and therapeutic interventions.