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2016 ; 537
(7620
): 357-362
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Locus coeruleus and dopaminergic consolidation of everyday memory
#MMPMID27602521
Takeuchi T
; Duszkiewicz AJ
; Sonneborn A
; Spooner PA
; Yamasaki M
; Watanabe M
; Smith CC
; Fernández G
; Deisseroth K
; Greene RW
; Morris RG
Nature
2016[Sep]; 537
(7620
): 357-362
PMID27602521
show ga
The retention of episodic-like memory is enhanced, in humans and animals, when
something novel happens shortly before or after encoding. Using an everyday
memory task in mice, we sought the neurons mediating this dopamine-dependent
novelty effect, previously thought to originate exclusively from the
tyrosine-hydroxylase-expressing (TH(+)) neurons in the ventral tegmental area.
Here we report that neuronal firing in the locus coeruleus is especially
sensitive to environmental novelty, locus coeruleus TH(+) neurons project more
profusely than ventral tegmental area TH(+) neurons to the hippocampus,
optogenetic activation of locus coeruleus TH(+) neurons mimics the novelty
effect, and this novelty-associated memory enhancement is unaffected by ventral
tegmental area inactivation. Surprisingly, two effects of locus coeruleus TH(+)
photoactivation are sensitive to hippocampal D(1)/D(5) receptor blockade and
resistant to adrenoceptor blockade: memory enhancement and long-lasting
potentiation of synaptic transmission in CA1 ex vivo. Thus, locus coeruleus TH(+)
neurons can mediate post-encoding memory enhancement in a manner consistent with
possible co-release of dopamine in the hippocampus.