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The monoblast is the first stage of monocyte-macrophage maturation. The developmental stages of the monoblast are: CFU-GM (pluripotential hemopoietic stem cell or hemocytoblast) -> monoblast -> promonocyte-> monocyte-> macrophage/dendritic cell. During their development, monocytes are present in large packs in all of the lymph nodes in the body ...
Monocytes can migrate into tissues and replenish resident macrophage populations. Macrophages have a high antimicrobial and phagocytic activity and thereby protect tissues from foreign substances. They are cells that possess a large smooth nucleus, a large area of cytoplasm, and many internal vesicles for processing foreign material.
CFU-GM (Colony Forming Unit–Granulocyte–Macrophage [a]), also known as granulocyte–macrophage progenitor (GMP), is a colony forming unit. It is derived from CFU-GEMM. It is the precursor for monoblasts and myeloblasts. Production is stimulated by granulocyte macrophage colony-stimulating factor (GM-CSF).
The monocyte is formed in the bone marrow and transported by the blood; it migrates into the tissues, where it transforms into a histiocyte or a macrophage. Macrophages are diffusely scattered in the connective tissue and in liver (Kupffer cells), spleen and lymph nodes (sinus histiocytes), lungs (alveolar macrophages), and central nervous ...
M-CSF is a cytokine and growth factor that is responsible for the proliferation and commitment of myeloid progenitors into monocytes (which then mature into macrophages). [ 3 ] [ 4 ] Macrophages have a wide variety of functions in the body including phagocytosis of foreign invaders and other cellular debris, releasing cytokines to trigger ...
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]
Their main function is the storage of lipid. Macrophages arise from monocytes. Monocytes originate in the bone marrow upon which they are released into the blood stream. They are mobile and leave the blood stream to enter connective tissues where they differentiate into macrophages. The fibroblasts are the most important in the connective tissue.
Since all previous researchers have indicated that epithelioid cells are formed from monocytes, and monocytes and macrophages were combined into a single mononuclear phagocyte system, Van Furth et al. (1972), referring to the work of Sutton J. and Weiss L. (1966), [6] formally attributed epithelioid cells to the mononuclear phagocyte system. [2]