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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 Neuropsychopharmacology
2014 ; 39
(12
): 2709-22
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English Wikipedia
Cannabinoids prevent the effects of a footshock followed by situational reminders
on emotional processing
#MMPMID24897957
Korem N
; Akirav I
Neuropsychopharmacology
2014[Nov]; 39
(12
): 2709-22
PMID24897957
show ga
Posttraumatic stress disorder (PTSD) can develop following exposure to a
traumatic event. Hence, what we do in the first few hours after trauma exposure
may alter the trajectory of PTSD. We examined whether cannabinoids can prevent
the effects of a single footshock followed by situational reminders (SRs) on
emotional processing. Rats were exposed to a footshock (1.5?mA, 10?s) on day 1
followed by exposure to SRs of the shock on days 3 and 5. The CB1/2 receptor
agonist WIN55,212-2 or vehicle were injected intraperitoneally 2?h after the
shock. After 1 week, PTSD-like symptoms were examined. Exposure to SRs
exacerbated the effects of the shock as rats exposed to shock and SRs, but not
shock alone, showed impaired extinction of the traumatic event, impaired
plasticity in the hippocmapal-accumbens pathway, enhanced latency to startle, and
altered expression of CB1 receptors (CB1r) and glucocorticoid receptors (GRs) in
the CA1, basolateral amygdala (BLA) and prefrontal cortex (PFC). WIN55,212-2
prevented the effects of the shock and SRs on extinction, plasticity, and startle
response. WIN55,212-2 normalized the shock/SR-induced upregulation in CB1r in the
PFC, and CA1 and GRs in the CA1, with no effect on BLA downregulation of CB1r and
GRs. Shock and SRs caused lasting (1 week) alterations in emotional processing
associated with changes in GR and CB1r expression in brain areas related to PTSD.
WIN55,212-2 administered after trauma exposure prevented these alterations via
PFC- and CA1-CB1r and CA1-GRs.