Alzheimer’s Disease Risk Gene CD33 Inhibits Microglial Uptake of Amyloid Beta

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Abstract
• CD33 is expressed in microglia and exhibits increased expression in AD • Numbers of CD33-immunoreactive microglia positively correlate with Aβ plaque burden • CD33 inhibits microglial uptake of Aβ42 • CD33 inactivation reduces insoluble Aβ42 levels in the APPSwe/PS1ΔE9 mouse brain