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A vicious cycle of ? amyloid-dependent neuronal hyperactivation.


ABSTRACT: ?-amyloid (A?)-dependent neuronal hyperactivity is believed to contribute to the circuit dysfunction that characterizes the early stages of Alzheimer's disease (AD). Although experimental evidence in support of this hypothesis continues to accrue, the underlying pathological mechanisms are not well understood. In this experiment, we used mouse models of A?-amyloidosis to show that hyperactivation is initiated by the suppression of glutamate reuptake. Hyperactivity occurred in neurons with preexisting baseline activity, whereas inactive neurons were generally resistant to A?-mediated hyperactivation. A?-containing AD brain extracts and purified A? dimers were able to sustain this vicious cycle. Our findings suggest a cellular mechanism of A?-dependent neuronal dysfunction that can be active before plaque formation.

SUBMITTER: Zott B 

PROVIDER: S-EPMC6690382 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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A vicious cycle of β amyloid-dependent neuronal hyperactivation.

Zott Benedikt B   Simon Manuel M MM   Hong Wei W   Unger Felix F   Chen-Engerer Hsing-Jung HJ   Frosch Matthew P MP   Sakmann Bert B   Walsh Dominic M DM   Konnerth Arthur A  

Science (New York, N.Y.) 20190801 6453


β-amyloid (Aβ)-dependent neuronal hyperactivity is believed to contribute to the circuit dysfunction that characterizes the early stages of Alzheimer's disease (AD). Although experimental evidence in support of this hypothesis continues to accrue, the underlying pathological mechanisms are not well understood. In this experiment, we used mouse models of Aβ-amyloidosis to show that hyperactivation is initiated by the suppression of glutamate reuptake. Hyperactivity occurred in neurons with preexi  ...[more]

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