Strengthened connections between engrams encode specific memories.

Abstract:

:In previous studies, memory storage was localized to engram cells distributed across the brain. While these studies have provided an individual cellular profile of engram cells, their synaptic connectivity, or whether they follow Hebbian mechanisms, remains uncertain. Therefore, our recent study investigated whether synapses between engram cells exhibit selectively enhanced structural and functional properties following memory formation. This was accomplished using a newly developed technique called "dual-eGRASP". We found that the number and size of spines on CA1 engram cells that receive inputs from CA3 engram cells were larger than at other synapses. We further observed that this enhanced connectivity correlated with induced memory strength. CA3 engram synapses exhibited increased release probability, while CA1 engram synapses produced enhanced postsynaptic responses. CA3 engram to CA1 engram projections showed strong occlusion of long-term potentiation. We demonstrated that the synaptic connectivity of CA3 to CA1 engram cells was strengthened following memory formation. Our results suggest that Hebbian plasticity occurs during memory formation among engram cells at the synapse level. [BMB Reports 2018; 51(8): 369-370].

journal_name

BMB Rep

journal_title

BMB reports

authors

Kim JI,Choi DI,Kaang BK

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

369-370

issue

8

eissn

1976-6696

issn

1976-670X

pii

4297

journal_volume

51

pub_type

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