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Unlike M1 macrophages, M2 macrophages secrete an anti-inflammatory response via the addition of Interleukin-4 or Interleukin-13. They also play a role in wound healing and are needed for revascularization and reepithelialization. M2 macrophages are divided into four major types based on their roles: M2a, M2b, M2c, and M2d.
Macrophage polarization is a process by which macrophages adopt different functional programs in response to the signals from their microenvironment. This ability is connected to their multiple roles in the organism: they are powerful effector cells of the innate immune system, but also important in removal of cellular debris, embryonic development and tissue repair.
M1 macrophages are known as pro-inflammatory, (secreting cytokines IL-1, IL-6, TNF- α, and IFN-γ) playing a crucial role in pathogen phagocytosis and cell debris clearance and molecules that promote inflammation in comparison with M2 macrophages (anti-inflammatory macrophages secreting IL-10 and VEGF) [1] that inhibit inflammation and ...
The mononuclear phagocyte system and the monocyte macrophage system refer to two different entities, often mistakenly understood as one. [ citation needed ] " Reticuloendothelial system " is an older term for the mononuclear phagocyte system, but it is used less commonly now, as it is understood that most endothelial cells are not macrophages .
M1 (classical activation) and M2 (alternative activation) designate the two extremes of macrophage polarization. M1-polarized Kupffer cells produce a large amount of pro-inflammatory cytokines like TNF-alpha. On the other hand, M2-polarized Kupffer cells produce a large quantity of anti-inflammatory mediators, for example, IL-10. [9] [4]
Regulatory macrophages (Mregs) represent a subset of anti-inflammatory macrophages. In general, macrophages are a very dynamic and plastic cell type and can be divided into two main groups: classically activated macrophages (M1) and alternatively activated macrophages (M2). [1] M2 group can further be divided into sub-groups M2a, M2b, M2c, and ...
Phagocytosis of a bacterium, showing the formation of phagosome and phagolysosome. In cell biology, a phagosome is a vesicle formed around a particle engulfed by a phagocyte via phagocytosis. Professional phagocytes include macrophages, neutrophils, and dendritic cells (DCs). [1]
Macrophages have been classified as M1 or M2 depending on the adaptive immune response that elicited the phenotype: Th1 or Th2 respectively. [2] [4] [5] The phrase 'alternatively activated macrophage' is used to refer to M2 macrophages. [2] Regulatory macrophages do not fit into the M1/M2 classification system, and they display different ...
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