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How do macrophages help clear damaged tissue after an injury?
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inflammation
The main function of complement proteins is to aid in the destruction of pathogens by piercing their outer membranes (cell lysis) or by making them more attractive to phagocytic cells such as macrophages (a process known as opsonization). Some complement components also promote inflammation by stimulating cells to release histamine and by attracting phagocytic cells to the site of infection.
Macrophages play a critical role in clearing damaged tissue and facilitating healing following an injury through the process of phagocytosis.12
While neutrophils are typically the first responders to a site of injury, macrophages arrive shortly thereafter to manage the cleanup. They help clear the area by engulfing and digesting various materials, including:2
- Cellular debris: Macrophages remove the remnants of tissue cells destroyed during the initial injury.2
- Spent phagocytes: They ingest neutrophils that have self-destructed after consuming microorganisms.2
- Foreign particles: They scavenge for bacteria, foreign substances, and other microscopic particles that may have entered the wound.341
By extending their cytoplasm to form pseudopods, macrophages surround these materials and sequester them into vacuoles, where they are broken down by secreted enzymes. In addition to this cleanup role, macrophages release chemicals that promote blood flow and capillary permeability, which helps recruit further immune support to the site of inflammation.42