Apolipoprotein E4 Causes Age-Dependent Disruption of Slow Gamma Oscillations during Hippocampal Sharp-Wave Ripples
Anna K Gillespie, Emily A Jones, Yuan-Hung Lin, Mattias P Karlsson, Kenneth Kay, Seo Yeon Yoon, Leslie M Tong, Philip Nova, Jessie S Carr, Loren M Frank, Yadong Huang, Anna K Gillespie, Emily A Jones, Yuan-Hung Lin, Mattias P Karlsson, Kenneth Kay, Seo Yeon Yoon, Leslie M Tong, Philip Nova, Jessie S Carr, Loren M Frank, Yadong Huang
Abstract
Apolipoprotein (apo) E4 is the major genetic risk factor for Alzheimer's disease (AD), but the mechanism by which it causes cognitive decline is unclear. In knockin (KI) mice, human apoE4 causes age-dependent learning and memory impairments and degeneration of GABAergic interneurons in the hippocampal dentate gyrus. Here we report two functional apoE4-KI phenotypes involving sharp-wave ripples (SWRs), hippocampal network events critical for memory processes. Aged apoE4-KI mice had fewer SWRs than apoE3-KI mice and significantly reduced slow gamma activity during SWRs. Elimination of apoE4 in GABAergic interneurons, which prevents learning and memory impairments, rescued SWR-associated slow gamma activity but not SWR abundance in aged mice. SWR abundance was reduced similarly in young and aged apoE4-KI mice; however, the full SWR-associated slow gamma deficit emerged only in aged apoE4-KI mice. These results suggest that progressive decline of interneuron-enabled slow gamma activity during SWRs critically contributes to apoE4-mediated learning and memory impairments. VIDEO ABSTRACT.
Conflict of interest statement
Y.H. is a cofounder and a scientific advisory board member of E-Scape Bio, Inc. Other authors declare no competing financial interests.
Copyright © 2016 Elsevier Inc. All rights reserved.
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References
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