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In humans, dysfunctional macrophages cause severe diseases such as chronic granulomatous disease that result in frequent infections. Beyond increasing inflammation and stimulating the immune system, macrophages also play an important anti-inflammatory role and can decrease immune reactions through the release of cytokines.
They are heavily involved in cancer-related inflammation. Macrophages are known to originate from bone marrow-derived blood monocytes (monocyte-derived macrophages) or yolk sac progenitors (tissue-resident macrophages), but the exact origin of TAMs in human tumors remains to be elucidated. [1]
Micrograph showing hemosiderin-laden alveolar macrophages, as seen in a pulmonary hemorrhage. H&E stain. An alveolar macrophage, pulmonary macrophage, (or dust cell) is a type of macrophage, a professional phagocyte, found in the airways and at the level of the alveoli in the lungs, but separated from their walls. [1]
A macrophage's location can determine its size and appearance. Macrophages cause inflammation through the production of interleukin-1, interleukin-6, and TNF-alpha. [75] Macrophages are usually only found in tissue and are rarely seen in blood circulation. The life-span of tissue macrophages has been estimated to range from four to fifteen days ...
An electron micrograph of a macrophage. This is the general morphology of macrophages. The anatomy of human skin. Dermal macrophages are usually present in the dermis and around hair follicles. Dermal macrophages are macrophages in the skin that facilitate skin homeostasis by mediating wound repair, hair growth, and salt balance. [1]
CD14 (cluster of differentiation 14) is a human protein made mostly by macrophages as part of the innate immune system. [5] [6] It helps to detect bacteria in the body by binding lipopolysaccharide (LPS), a pathogen-associated molecular pattern (PAMP).
Some data find lower rates of early pregnancy loss in human couples of dissimilar MHC genes. [30] MHC may be related to mate choice in some human populations, a theory that found support by studies by Ober and colleagues in 1997, [31] as well as by Chaix and colleagues in 2008. [32] However, the latter findings have been controversial. [33]
In human macrophages, NLRP11 is an indispensable component of the NLRP3 inflammasome. The most studied inflammasome sensor molecule of the NLR family is NLRP3, and it contains an amino-terminal PYRIN (PYD) domain, a nucleotide-binding NACHT domain, and a carboxyterminal leucine-rich repeat (LRR) domain.
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