Physiological roles of macrophages.

Area of Science:

• Immunology
• Cell Biology
• Physiology

Background:

• Macrophages are crucial immune cells present in mammals from midgestation.
• They originate from yolk sac and fetal liver progenitors, forming self-renewing tissue-resident populations.
• Postnatal monocytes replenish these populations and aid in inflammation and infection responses.

Purpose of the Study:

• To review the selected properties and non-immune functions of tissue macrophages.
• To highlight their contribution to physiological homeostasis throughout mammalian life.

Main Methods:

• This is a review article, synthesizing existing research.
• Focuses on the developmental origins and functional roles of macrophages.
• Emphasizes non-immune functions and tissue-specific contributions.

Main Results:

• Macrophages exhibit heterogeneity based on origin and location.
• They are active in mRNA and protein synthesis, supporting trophic functions.
• Tissue macrophages play vital roles in maintaining physiological homeostasis beyond host defense.

Conclusions:

• Tissue-resident macrophages are essential for maintaining physiological homeostasis.
• Their non-immune functions are critical for organ-specific and systemic health.
• Macrophages represent a key focus for understanding mammalian physiological balance.