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- W2141962812 abstract "Alzheimer’s disease (AD) is characterized by the deposition of amyloid-β (Aβ), which is associated with a neuroinflammatory response involving microglia and astrocytes. This neuroinflammatory response has detrimental effects on disease progression but also has a beneficial function on removal of excess Aβ. Microglia and astrocytes are involved in the clearance of Aβ from the brain, but neuroinflammation also promotes neurodegeneration. In order to identify signal transduction pathways critically involved in AD we analysed human brain tissue using protein kinase activity profiling. We identified increased activity of the Interleukin 1 Receptor Associated Kinase 4 (IRAK-4) in AD compared to control brain tissue. IRAK-4 is a component of the signal transduction pathway that functions downstream of the Toll-like receptors and the interleukin-1 receptor. Immunohistochemical analysis of human brain tissue revealed the presence of IRAK-4 in astrocytes and microglia. Quantification of IRAK-4 and the phosphorylated form of IRAK-1, a specific substrate for IRAK-4, revealed increased expression and activity of IRAK-4 in AD. Interestingly, IRAK-1/4 inhibitor I reduces the lipopolysaccharide-induced secretion of monocyte chemotactic protein-1 (MCP-1) by primary human microglia and the interleukin-1β-induced secretion of MCP-1 and interleukin 6 by primary human astrocytes. In contrast, the uptake of Aβ by astrocytes and microglia is not affected by IRAK-1/4 inhibition. Our data show that IRAK-4 protein kinase activity is increased in AD and selective inhibition of IRAK-1/4 inhibits a pro-inflammatory response without affecting the uptake of Aβ by glial cells, indicating that the IRAK signalling pathway is a potential target for modulating neuroinflammation in AD." @default.
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- W2141962812 date "2014-01-01" @default.
- W2141962812 modified "2023-09-24" @default.
- W2141962812 title "Increased IRAK-4 Kinase Activity in Alzheimer’s Disease; IRAK-1/4 Inhibitor I Prevents Pro-inflammatory Cytokine Secretion but not the Uptake of Amyloid Beta by Primary Human Glia" @default.
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- W2141962812 doi "https://doi.org/10.4172/2155-9899.1000243" @default.
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