located in has plasma membrane part capable of has low plasma membrane amount Kupffer cell stellate cell of von Kupffer macrophagocytus stellatus Kupffer cells are tissue-resident macrophages located in the liver. They are an integral part of the mononuclear phagocyte system and are responsible for the phagocytosis of dead or dying cells, microbes, and other foreign substances. Kupffer cells account for approximately 80-90% of tissue-resident macrophages in the body. They are found within the lumen of liver sinusoids and interface with microbial populations and products. The primary role of Kupffer cells is to maintain homeostasis in the liver. They continuously filter and cleanse the blood that flows through the liver, removing pathogens, endotoxins, particulate matter, aged and dysfunctional red blood cells, and miscellaneous waste products. These cells also play an important role in maintaining iron homeostasis. During the process of phagocytosis, Kupffer cells recycle iron from degraded red blood cells, which is then utilized in the formation of new erythrocytes. Kupffer cells also play key roles in various immune responses and inflammatory processes. They secrete various types of cytokines and chemokines, which contribute to the activation and mobilization of other immune cells. They can also produce reactive oxygen species and nitric oxide, which have microbicidal actions. Although their activity is essential for host defense, excessive or prolonged activation of Kupffer cells may contribute to hepatic injury, inflammation, and fibrosis. (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.) liver macrophage BTO:0000685 Markers: Mouse: F4/80+, CD11b-low, CD68+, sialoadhesin+, CD163/SRCR+; role or process: immune, antigen-presentation, clearance of senescent erythrocytes, iron metabolism. Kupffer cells are also reportedly C3aR-positive, CD14-low, CD54-positive, CD88-positive, and CD284-positive. They are also capable of producing IL-1, IL-6, TNF-alpha, nitric oxide, PGD2, PGE2, PGF2alpha, and TXA2. https://cdn.humanatlas.io/digital-objects/2d-ftu/liver-liver-lobule/v1.3/assets/2d-ftu-liver-liver-lobule.png littoral cell of hepatic sinusoid A tissue-resident macrophage of the reticuloendothelial system found on the luminal surface of the hepatic sinusoids involved in erythrocyte clearance. Markers include F4/80+, CD11b-low, CD68-positive, sialoadhesin-positive, CD163/SRCR-positive. Irregular, with long processes including lamellipodia extending into the sinusoid lumen, have flattened nucleus with cytoplasm containing characteristic invaginations of the plasma membrane (vermiform bodies); lie within the sinusoid lumen attached to the endothelial surface; derived from the bone marrow, form a major part of the body's mononuclear phagocyte system. von Kupffer cell https://cellxgene.cziscience.com/cellguide/CL_0000091 FMA:14656 hepatic macrophage tissue-resident macrophage erythrocyte clearance Homo sapiens integrin alpha-M adhesion G protein-coupled receptor E1 scavenger receptor cysteine-rich type 1 protein M130 macrosialin hepatic sinusoid