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2015 ; 294
(ä): 177-85
Nephropedia Template TP
gab.com Text
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English Wikipedia
Rapastinel (GLYX-13) has therapeutic potential for the treatment of
post-traumatic stress disorder: Characterization of a NMDA receptor-mediated
metaplasticity process in the medial prefrontal cortex of rats
#MMPMID26210936
Burgdorf J
; Kroes RA
; Zhang XL
; Gross AL
; Schmidt M
; Weiss C
; Disterhoft JF
; Burch RM
; Stanton PK
; Moskal JR
Behav Brain Res
2015[Nov]; 294
(ä): 177-85
PMID26210936
show ga
Rapastinel (GLYX-13) is a NMDA receptor modulator with glycine-site partial
agonist properties. It is a robust cognitive enhancer and shows rapid and
long-lasting antidepressant properties in both animal models and in humans.
Contextual fear extinction (CFE) in rodents has been well characterized and used
extensively as a model to study the neurobiological mechanisms of post-traumatic
stress disorder (PTSD). Since CFE is NMDA receptor modulated and neural circuitry
in the medial prefrontal cortex (MPFC) regulates both depression and PTSD,
studies were undertaken to examine the effects of rapastinel for its therapeutic
potential in PTSD and to use rapastinel as a tool to study its underlying
glutamatergic mechanisms. A 21-day chronic mild unpredictable stress (CUS) rat
model was used to model depression and PTSD. The effects of CUS alone compared to
No CUS controls, and the effects of rapastinel (3 mg/kg IV) on CUS-treated
animals were examined. The effect of rapastinel was first assessed using
CUS-treated rats in three depression models, Porsolt, sucrose preference, and
novelty-induced hypophagia tests, and found to produce a complete reversal of the
depressive-like state in each model. Rapastinel was then assessed in a
MPFC-dependent positive emotional learning paradigm and in CFE and again a
reversal of the impairments induced by CUS treatment was observed. Both synaptic
plasticity and metaplasticity, as measured by the induction of long-term
potentiation in rat MPFC slice preparations, was found to be markedly impaired in
CUS-treated animals. This impairment was reversed when CUS-treated rats were
administered rapastinel and tested 24 h later. Transcriptomic analysis of MPFC
mRNA expression in CUS-treated rats corroborated the link between rapastinel's
behavioral effects and synaptic plasticity. A marked enrichment in both the LTP
and LTD connectomes in rapastinel-treated CUS rats was observed compared to
CUS-treated controls. The effects of rapastinel on depression models, PEL, and
most importantly on CFE demonstrate the therapeutic potential of rapastinel for
the treatment of PTSD. Moreover, rapastinel appears to elicit its therapeutic
effects through a NMDA receptor-mediated, LTP-like, metaplasticity process in the
MPFC.