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• W2067969020 abstract "Alzheimer’s disease (AD) is a progressive chronic disorder that leads to cognitive decline. Several studies have associated up-regulation of some of the chemokines and/or their receptors with altered APP processing leading to increased production of β-amyloid protein (Aβ) and AD pathological changes. However, there is no direct evidence to date to determine whether the altered processing of APP results in up-regulation of these receptors or whether the up-regulation of the chemokine receptors causes modulated processing of APP. In the current study, we demonstrate that treatment of the chemokine receptor CXCR2 with agonists leads to enhancement of Aβ production and treatment with antagonists or immunodepletion of CXCR2’s endogenous agonists leads to Aβ inhibition. Further, we found that the inhibitory effect of the antagonist of CXCR2 on Aβ40 and Aβ42 is mediated via γ-secretase, specifically through reduction in expression of presenilin (PS), one of the γ-secretase components. Also, in vivo chronic treatment with a CXCR2 antagonist blocked Aβ40 and Aβ42 production. Using small interfering RNAs for CXCR2, we further showed that knockdown of CXCR2 in vitro accumulates γ-secretase substrates C99 and C83 with reduced production of both Aβ40 and Aβ42. Taken together, these findings strongly suggest for the first time that up-regulation of the CXCR2 receptor can be the driving force in increased production of Aβ. Our findings unravel new mechanisms involving the CXCR2 receptor in the pathogenesis of AD and pose it as a potential target for developing novel therapeutics for intervention in this disease. Also, we propose here a new chemical series of interest that can serve as a prototype for drug development." @default.
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• W2067969020 date "2008-12-09" @default.
• W2067969020 modified "2023-09-25" @default.
• W2067969020 title "Novel Role of CXCR2 in Regulation of γ-Secretase Activity" @default.
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• W2067969020 doi "https://doi.org/10.1021/cb800167a" @default.
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