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2015 ; 82
(ä): 176-184
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Adolescent cannabis exposure interacts with mutant DISC1 to produce impaired
adult emotional memory
#MMPMID26093170
Ballinger MD
; Saito A
; Abazyan B
; Taniguchi Y
; Huang CH
; Ito K
; Zhu X
; Segal H
; Jaaro-Peled H
; Sawa A
; Mackie K
; Pletnikov MV
; Kamiya A
Neurobiol Dis
2015[Oct]; 82
(ä): 176-184
PMID26093170
show ga
Cannabis is an increasingly popular and controversial drug used worldwide.
Cannabis use often begins during adolescence, a highly susceptible period for
environmental stimuli to alter functional and structural organization of the
developing brain. Given that adolescence is a critical time for the emergence of
mental illnesses before full-onset in early adulthood, it is particularly
important to investigate how genetic insults and adolescent cannabis exposure
interact to affect brain development and function. Here we show for the first
time that a perturbation in disrupted in schizophrenia 1 (DISC1) exacerbates the
response to adolescent exposure to delta-9-tetrahydrocannabinol (?(9)-THC), a
major psychoactive ingredient of cannabis, consistent with the concept that
gene-environment interaction may contribute to the pathophysiology of psychiatric
conditions. We found that chronic adolescent treatment with ?(9)-THC exacerbates
deficits in fear-associated memory in adult mice that express a putative
dominant-negative mutant of DISC1 (DN-DISC1). Synaptic expression of cannabinoid
receptor 1 (CB1R) is down-regulated in the prefrontal cortex, hippocampus, and
amygdala, critical brain regions for fear-associated memory, by either expression
of DN-DISC1 or adolescent ?(9)-THC treatment. Notably, elevation of c-Fos
expression evoked by context-dependent fear memory retrieval is impaired in these
brain regions in DN-DISC1 mice. We also found a synergistic reduction of c-Fos
expression induced by cue-dependent fear memory retrieval in DN-DISC1 with
adolescent ?(9)-THC exposure. These results suggest that alteration of
CB1R-mediated signaling in DN-DISC1 mice may underlie susceptibility to
detrimental effects of adolescent cannabis exposure on adult behaviors.