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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Mol+Neurobiol
2015 ; 52
(3
): 1421-1429
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Social Isolation During Adolescence Strengthens Retention of Fear Memories and
Facilitates Induction of Late-Phase Long-Term Potentiation
#MMPMID25860250
Liu JH
; You QL
; Wei MD
; Wang Q
; Luo ZY
; Lin S
; Huang L
; Li SJ
; Li XW
; Gao TM
Mol Neurobiol
2015[Dec]; 52
(3
): 1421-1429
PMID25860250
show ga
Social isolation during the vulnerable period of adolescence produces emotional
dysregulation that often manifests as abnormal behavior in adulthood. The
enduring consequence of isolation might be caused by a weakened ability to forget
unpleasant memories. However, it remains unclear whether isolation affects
unpleasant memories. To address this, we used a model of associative learning to
induce the fear memories and evaluated the influence of isolation mice during
adolescence on the subsequent retention of fear memories and its underlying
cellular mechanisms. Following adolescent social isolation, we found that mice
decreased their social interaction time and had an increase in anxiety-related
behavior. Interestingly, when we assessed memory retention, we found that
isolated mice were unable to forget aversive memories when tested 4 weeks after
the original event. Consistent with this, we observed that a single train of
high-frequency stimulation (HFS) enabled a late-phase long-term potentiation
(L-LTP) in the hippocampal CA1 region of isolated mice, whereas only an
early-phase LTP was observed with the same stimulation in the control mice.
Social isolation during adolescence also increased brain-derived neurotrophic
factor (BDNF) expression in the hippocampus, and application of a
tropomyosin-related kinase B (TrkB) receptor inhibitor ameliorated the
facilitated L-LTP seen after isolation. Together, our results suggest that
adolescent isolation may result in mental disorders during adulthood and that
this may stem from an inability to forget the unpleasant memories via
BDNF-mediated synaptic plasticity. These findings may give us a new strategy to
prevent mental disorders caused by persistent unpleasant memories.