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When do monocytes usually arrive at an inflamed area?
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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.
In the context of the acute inflammatory response, monocytes typically arrive at the site of injury or infection approximately 24 to 28 hours after the inflammation begins.1
They follow the arrival of neutrophils, which are the primary phagocytes that reach the site of injury first, often within an hour. Once at the site, monocytes mature into macrophages, which are essential for engulfing pathogens and clearing cellular debris. While monocytes are recruited during the acute phase, macrophages become more prevalent at the injury site over the following days or weeks and serve as a cellular hallmark of chronic inflammation.123