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EMR1 expression in human is restricted to eosinophils and is a specific marker for these cells. [14] The murine homolog of EMR1, F4/80, is a well-known and widely used marker of murine macrophage populations.
Macrophages also play a role in human immunodeficiency virus (HIV) infection. Like T cells, macrophages can be infected with HIV, and even become a reservoir of ongoing virus replication throughout the body. HIV can enter the macrophage through binding of gp120 to CD4 and second membrane receptor, CCR5 (a chemokine receptor).
It also is a marker of cells from the monocyte/macrophage lineage. [8] CD163 functions as innate immune sensor for gram-positive and gram-negative bacteria. [9] [10] The receptor was discovered in 1987. [11]
Present in macrophages in many human tissues including Kupffer's cells and macrophages in the red pulp of the spleen, in lung alveoli, in lamina propria of the gut, and in the bone marrow. Used as immunocytochemical marker for staining of monocytes/macrophages. CD69: An early activation marker on T cells and NK cells. CD70
ED1 is the most widely used monoclonal antibody clone directed against the rat CD68 protein and is used to identify macrophages, Kupffer cells, osteoclasts, monocytes, and activated microglia in rat tissues. [13] [14] [15] In this species, it is expressed in most macrophage populations and thus ED1 is commonly used as a pan-macrophage marker. [16]
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.
CD16 is often used as an additional marker to reliably identify different subsets of human immune cells. [12] Several other CD molecules, such as CD11b and CD33, are traditionally used as markers for human myeloid-derived suppressor cells (MDSCs). [ 12 ]
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 ...
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