Scientists at the University of Liège have discovered a genetic switch that helps immune cells mature properly and protect organs. The switch, called MafB, guides precursor cells to develop into macrophages, the body’s cleanup crew that removes pathogens and recycles iron. When MafB is missing, these cells remain underdeveloped and cannot carry out their protective roles.
A research team led by Professor Thomas Marichal from the University of Liège’s Immunophysiology Laboratory identified the genetic regulator. The study was published in a scientific journal with Domien Vanneste as first author.
Macrophages are immune cells found in nearly every tissue. They destroy pathogens, clear dead cells and debris, recycle materials like iron, and help tissues function normally. Until now, researchers did not fully understand how these cells keep their core identity while adapting to different organs.
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The team discovered that MafB acts as a master switch that gives macrophages their identity. As immature cells called monocytes develop into tissue macrophages, MafB levels rise and direct the maturation process. Without this genetic program, macrophages remain stuck in an immature state and cannot protect the organs where they live.
At the molecular level, MafB controls a network of genes responsible for critical macrophage activities. These include phagocytosis, the ability to engulf harmful particles and cellular debris. The researchers found this regulatory program is highly conserved from mice to humans and across vertebrates, showing its fundamental biological importance.
The effects of missing MafB go beyond immune defense. The team observed problems in iron recycling within the spleen and in the normal functioning of the lungs, intestines and kidneys. This shows how deeply macrophages contribute to the body’s overall physiological balance.
Professor Thomas Marichal explained that MafB functions as a master regulator that gives macrophages their identity and equips them with capabilities to support organ health. Without this instruction program, the cells are present but not fully operational.
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The discovery has medical implications for chronic conditions. Dysfunctional macrophages play a role in inflammatory disorders, fibrosis, infections and metabolic diseases. Targeting MafB or the pathways it controls could help restore healthy macrophage function and improve tissue health across a range of illnesses.
