Progression in the In Vitro Macrophage Expansion

Area of Science:

• Immunology
• Cell Biology

Background:

• Macrophages are crucial for health and disease.
• Previously thought terminally differentiated, macrophages now known to self-renew in vivo and in vitro.
• Efficient in vitro macrophage expansion is vital for advancing immune cell therapies.

Purpose of the Study:

• To review current strategies for stimulating macrophage proliferation in vitro.
• To explore the diverse mechanisms underlying macrophage self-renewal.
• To identify challenges and future directions for large-scale macrophage expansion.

Main Methods:

• Literature review of studies on macrophage proliferation.
• Analysis of factors influencing macrophage self-renewal in vitro.
• Synthesis of findings on cytokines, small molecules, metabolites, and other stimuli.

Main Results:

• Multiple factors identified that promote macrophage proliferation in vitro.
• Mechanisms involve cytokines, small molecules, metabolites, pathogen components, and gene editing.
• Heterogeneity and microenvironment crosstalk complicate in vitro expansion.

Conclusions:

• Diverse approaches and mechanisms can stimulate macrophage proliferation.
• Further research is needed to overcome current limitations.
• Achieving large-scale engineering expansion requires continued investigation into proliferation mechanisms.