Sirtuin-dependent metabolic and epigenetic regulation of macrophages during tuberculosis

Area of Science:

• Immunology
• Cell Biology
• Metabolic pathways

Background:

• Macrophages are crucial phagocytic cells that combat infections, including tuberculosis caused by Mycobacterium tuberculosis (MTB).
• MTB infects and persists within macrophages, necessitating robust antimicrobial mechanisms.
• Macrophages employ reactive oxygen/nitrogen species (ROS/RNS) and autophagy to eliminate intracellular pathogens.

Purpose of the Study:

• To elucidate the role of glucose metabolism in regulating macrophage antimicrobial functions.
• To describe the function of sirtuins in the epigenetic regulation of macrophage activation.
• To illustrate the interplay between immunometabolism and epigenetics in controlling macrophage responses.

Main Methods:

• Review of literature on macrophage function, glucose metabolism, and epigenetic regulation.
• Analysis of the role of sirtuins (NAD+-dependent deacetylases) in cellular processes.
• Examination of the cross-talk between metabolic pathways and epigenetic modifications.

Main Results:

• Glucose metabolism is essential for macrophage growth and generates key mediators for epigenetic regulation.
• Sirtuins epigenetically regulate autophagy, ROS/RNS production, and levels of acetyl-CoA, NAD+, and S-adenosine methionine (SAM).
• A significant cross-talk exists between immunometabolism and epigenetics, influencing macrophage activation and antimicrobial capacity.

Conclusions:

• Sirtuins play a pivotal role in linking immunometabolism and epigenetics to control macrophage antimicrobial functions.
• Targeting sirtuins offers a promising therapeutic strategy to modulate macrophage immunometabolism and enhance their ability to fight infections.
• Understanding this metabolic-epigenetic interplay is key to developing novel treatments for infectious diseases like tuberculosis.