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- W2014012364 abstract "Microglia, the resident immune cells in the brain, play a pivotal role in immune surveillance, host defense, and tissue repair in the CNS. In response to immunological challenges, microglia readily become activated as characterized by morphological changes, expression of surface antigens, and production of immune modulators that impact on neurons to induce neurodegeneration. However, little is known concerning the fate of activated microglia. In the present study, stimulation of cultured rat primary microglia with 1 ng/mL of the inflammagen lipopolysaccharide (LPS) resulted in a maximal activation as measured by the release of tumor necrosis factor alpha (TNF alpha). However, treatment with higher concentrations of LPS resulted in significantly lower quantities of detectable TNF alpha. Further analysis revealed that overactivation of microglia with higher concentrations of LPS (> 1 ng/mL) resulted in a time- and dose-dependent apoptotic death of microglia as defined by DNA strand breaks, surface expression of apoptosis-specific markers (phosphatidylserine), and activation of caspase-3. In contrast, astrocytes were insensitive to LPS-induced cytotoxicity. In light of the importance of microglia and the limited replenishment mechanism, depletion of microglia from the brain may severely hamper its capacity for combating inflammatory challenges and tissue repair. Furthermore, overactivation-induced apoptosis of microglia may be a fundamental self-regulatory mechanism devised to limit bystander killing of vulnerable neurons." @default.
- W2014012364 created "2016-06-24" @default.
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- W2014012364 date "2001-04-01" @default.
- W2014012364 modified "2023-10-18" @default.
- W2014012364 title "Molecular consequences of activated microglia in the brain: overactivation induces apoptosis" @default.
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- W2014012364 doi "https://doi.org/10.1046/j.1471-4159.2001.t01-1-00216.x" @default.
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