Contribution of metabolic reprogramming to macrophage plasticity and function

Area of Science:

• Immunology
• Cell Biology
• Metabolic Pathways

Background:

• Macrophages exhibit diverse functional phenotypes influenced by their microenvironment.
• Macrophage plasticity, or their ability to change function, is critical in various physiological and pathological conditions.
• The precise mechanisms by which the microenvironment regulates macrophage plasticity remain incompletely understood.

Purpose of the Study:

• To review and discuss the role of cellular metabolic pathways in macrophage sensing of the microenvironment.
• To explore how metabolic reprogramming contributes to macrophage functional activation and polarization.
• To highlight the link between macrophage metabolism and chronic inflammatory diseases.

Main Methods:

• Literature review of recent studies on macrophage biology and metabolism.
• Analysis of cellular metabolic pathways involved in macrophage activation and deactivation.
• Discussion of cytosolic and mitochondrial mechanisms regulating macrophage plasticity.

Main Results:

• Distinct microenvironmental alterations induce specific, reversible metabolic programs in macrophages.
• Inflammatory macrophage activation is strongly associated with metabolic reprogramming, including aerobic glycolysis and altered mitochondrial respiration.
• Bidirectional communication between macrophages and stromal cells involves metabolic pathways crucial for chronic inflammation.

Conclusions:

• Cellular metabolic pathways are fundamental to how macrophages sense and respond to their microenvironment, underpinning their plasticity.
• Metabolic reprogramming, particularly aerobic glycolysis, is a key feature of inflammatory macrophage activation.
• Mitochondria play a dynamic role in regulating macrophage activation and plasticity beyond energy production and apoptosis control.