participates in has plasma membrane part develops from macrophage classical monocyte elicited macrophage The elicited macrophage, also commonly referred to as an activated macrophage, is a specialized type of cell that forms a critical part of the immune response. These cells originate from monocytes, a type of white blood cell that circulates in the bloodstream. In response to infection, inflammation, or tissue injury, monocytes leave the bloodstream, enters the inflamed tissue, and differentiates into a macrophage. The term "elicited" indicates that these cells have been activated or stimulated, usually through exposure to mediators such as lipopolysaccharide (LPS) or interferon-gamma (IFN-gamma), and have acquired enhanced microbicidal and tumoricidal capabilities. One of the hallmark features of elicited macrophages is their remarkable plasticity, which enables them to assume distinct activation states depending on the signals they receive. Macrophage activation states span a spectrum of phenotypes and functions, but are often classified into a few groups for simplicity. Classically activated macrophages, also known as M1 macrophages, are typically induced by pro-inflammatory cytokines such as interferon-gamma (IFN-γ) and microbial products like lipopolysaccharide (LPS). These M1 macrophages exhibit potent microbicidal and pro-inflammatory functions, aiding in the clearance of pathogens and the initiation of immune responses. Alternatively activated macrophages, or M2 macrophages, are typically associated with tissue repair, wound healing, and immunoregulation. They are induced by anti-inflammatory cytokines such as interleukin-4 (IL-4) and interleukin-13 (IL-13), as well as factors released during tissue remodeling. Elicited macrophages can transition between phenotypes in response to changing environmental cues, thereby exerting context-dependent effects on immune and tissue homeostasis. Elicited macrophages perform a range of functions in order to respond to the type of insult that has occurred. They can phagocytose cellular debris, foreign substances, microbes, and cancer cells. They can also act as antigen-presenting cells (APCs). After ingesting a pathogen, these cells present fragments of the pathogen on their surface using a molecule class called Major Histocompatibility Complex (MHC) II cluster. These antigens then interact with the cognate T cell receptors on T-cells, triggering a larger immune response. Elicited macrophages can produce numerous substances that are essential to the immune response. This includes pro-inflammatory cytokines, such as tumor necrosis factor-alpha (TNF-alpha), interleukins, chemokines, and reactive oxygen and nitrogen species that help neutralize pathogens. Additionally, they can play a role in wound healing, growth and tissue reconstruction by secreting factors that promote angiogenesis. While the activation of elicited macrophages is essential for the immune response, prolonged or inappropriate activation can contribute to a range of pathological conditions, including chronic inflammation, autoimmunity, and cancer. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) Markers: CD11b+, CD68+; Mouse: F4/80+; role or process: immune, inflammation (inflammatory response). FMA:84645 FMA:84643 https://cellxgene.cziscience.com/cellguide/CL_0000861 free macrophage wandering histiocyte A macrophage which develops from an inflammatory monocyte and is recruited into the tissues in response to injury and infection as part of an inflammatory response. Markers include CD11b-positive, CD68-positive, and F4/80-positive. inflammatory response integrin alpha-M adhesion G protein-coupled receptor E1 macrosialin