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Amoeboid Microglia. Other microglia in the cerebral neocortex which were also OX42 positive were not derived from any of the rhodaminelabelled cells. Microglia the resident immune cells of the central nervous system CNS have two distinct phenotypes in the developing brain. Amoeboid microglia-macrophages entering from the ventral routes were restricted to the WM intermediate zone then migrated and matured both radially and tangentially toward the immature subplate. Other microglia in the cerebral neocortex which were also OX42 positive were not derived from any of the rhodaminelabelled cells.
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The aim of this study was to characterize the morphometric properties of human microglia in gray and white matter of dorsal anterior cingulate cortex dACC. The transformation of amoeboid microglia into ramified microglia which occurs between the second and third postnatal week is considered to be a regressive phenomenon as shown by the diminution of their content of hydrolytic enzymes and the downregulation of membrane antigen. Although morphological properties of microglia have been described in rodents little is known about their fine features in humans. Amoeboid form known to be amoeboid microglial cells AMC and ramified form known to be ramified microglial cells RMC. Amoeboid microglia are associated with the developing CNS. Amoeboid microglia with fewer or even absent processes are highly motile and active phagocytes 23.
Microglia can adopt different morphologies ranging from a highly ramified to an amoeboid-like phenotype.
Microglia can adopt different morphologies ranging from a highly ramified to an amoeboid-like phenotype. Despite this structural distinction the underlying molecular mechanisms may be similar. Amoeboid microglia in situ also extend processes that identify and phagocyte the pathogenic material although these processes have a velate appearance quite different from processes in ramified microglia. Histochemical markers show that the microglial preparations are homogeneous 95 f 3 and represent a 10 yield from starting cultures. Amoeboid form known to be amoeboid microglial cells AMC and ramified form known to be ramified microglial cells RMC. Microglia can adopt different morphologies ranging from a highly ramified to an amoeboid-like phenotype.
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Amoeboid form known to be amoeboid microglial cells AMC and ramified form known to be ramified microglial cells RMC. Amoeboid microglia are associated with the developing CNS. Although morphological properties of microglia have been described in rodents little is known about their fine features in humans. The aim of this study was to characterize the morphometric properties of human microglia in gray and white matter of dorsal anterior cingulate cortex dACC. Amoeboid microglia with fewer or even absent processes are highly motile and active phagocytes 23.
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Despite this structural distinction the underlying molecular mechanisms may be similar. The transformation of amoeboid microglia into ramified microglia which occurs between the second and third postnatal week is considered to be a regressive phenomenon as shown by the diminution of their content of hydrolytic enzymes and the downregulation of membrane antigen. The molecular mechanisms regulating perinatal amoeboid microglia proliferation and transition to the ramified deactivated state are key initial steps in the establishment of the adult brain microglial cell pool because postnatal hematopoiesis does not significantly contribute to microglia homeostasis in the adult brain parenchyma Sminia et al 1987. Ajami et al 2007. Studies have demonstrated that AMC gradually transform into ramified microglial cells RMC with advancing age 2.
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The amoeboid microglial cells AMC which are abundant in the periventricular white matter namely the corpus callosum CC of the brain function as macrophages in the developing brain. These cells exhibit a round cell body possess pseudopodia and thin filopodia-like processes and contain numerous lysosomes. Ajami et al 2007. Microglia can adopt different morphologies ranging from a highly ramified to an amoeboid-like phenotype. Amoeboid form known to be amoeboid microglial cells AMC and ramified form known to be ramified microglial cells RMC.
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Microglia are the primary resident immune cells of the brain parenchyma and transform into the amoeboid form in the activated state under pathological conditions from the ramified form in the resting state under physiologically healthy conditions. Although morphological properties of microglia have been described in rodents little is known about their fine features in humans. Amoeboid form known to be amoeboid microglial cells AMC and ramified form known to be ramified microglial cells RMC. Thus ramified microglia can transform into an activated state characterized by swollen ramified cells with a larger cell body and shorter thick processes or alternatively microglia can adopt a reactive state typically small spherical cells but can also exhibit rod-shape or amoeboid-like morphologies Davis et al 1994. All traits indicative of a motile phagocytic phenotype.
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