Macrophages : Study
Emerging evidence indicates that macrophage behavior emerges from the coordinated integration of ontogenetic imprinting, environmental sensing, metabolic rewiring, and epigenetic remodeling.
- Macrophages are specialised white blood cells (WBCs) that play an important role in the body’s immune system by engulfing and destroying pathogens, dead cells, and cellular debris.
- Most macrophages develop from monocytes, a type of WBC produced in the bone marrow. Some tissue-resident macrophages originate from embryonic cells.
- Macrophages do not travel through the blood. Instead, they remain in one part of the body, within specific tissues.
- Macrophages have receptors on the outside that they use like antennae. These antennae get signals from substances in the environment around them.
- If a macrophage detects something it should get rid of, it swallows or “eats” it (a process called phagocytosis, or “cell eating”).
Types:
- Macrophages have two modes (phenotypes):
- M1, or inflammatory mode: M1 macrophages destroy germs and cancer cells and alert immune cells to infections.
- M2, or anti-inflammatory mode: M2 macrophages help with wound healing, clearing out dead cells, and tissue repair.
- Macrophages are known for their ability to destroy foreign substances that get into the body. They also help in:
- Activating B cells and T cells, which helps them target pathogens.
- Removing dead and damaged cells.
- Releasing proteins like cytokines that alert other immune cells to infections.
- Repairing tissue, healing wounds, and reducing inflammation.
- Breaking down old red blood cells and recycling the iron.
- Regulating fetal tissue development.
- Regulating organ function and maintaining homeostasis.
