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Macrophages and intestinal macrophages have high plasticity causing their phenotype to be altered by their environments. [124] Like macrophages, intestinal macrophages are differentiated monocytes, though intestinal macrophages have to coexist with the microbiome in the intestines. This is a challenge considering the bacteria found in the gut ...
In immunology, the mononuclear phagocyte system or mononuclear phagocytic system (MPS) also known as the macrophage system is a part of the immune system that consists of the phagocytic cells [1] located in reticular connective tissue. The cells are primarily monocytes and macrophages, and they accumulate in lymph nodes and the spleen.
M cells are distinguished from other intestinal epithelial cells by their morphological differences. They are characterized by their short microvilli or lack of these protrusions on the cell surface. When they present microvilli, they are short, irregular, and present on the apical surface or pocket-like invagination on the basolateral surface ...
Subsets of sensory intestinal epithelial cells synapse with nerves, [9] and are known as neuropod cells. [10] Paneth cells produce antimicrobial peptides such as human alpha-defensin. [11] [12] Microfold cells (commonly referred to as M cells) sample antigens from the lumen and deliver them to the lymphoid tissue associated with the mucosa (MALT).
During the years that followed after Aschoff had originated the concept of RES, research on macrophages and their role as phagocytes steadily increased, and in 1960 the concept of the mononuclear phagocyte system was proposed to denote all cells identified as macrophages. The cells of MPS, by way of their common functional signature as ...
Monocytes, and the macrophages that mature from them, leave blood circulation to migrate through tissues. There they are resident cells and form a resting barrier. [11] Macrophages initiate phagocytosis by mannose receptors, scavenger receptors, Fcγ receptors and complement receptors 1, 3 and 4. Macrophages are long-lived and can continue ...
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.
M2a, mainly known as alternatively activated macrophages, are macrophages associated with tissue healing due to the production of components of extracellular matrix. M2a cells are induced by IL-4 and IL-13. [2] M2b, generally referred to as regulatory macrophages (Mregs), are characterized by secreting large amounts of IL-10 and small amounts ...