Abstract
Rationale
NMDA-R (N-methyl-d-aspartate receptors) have been implicated in synaptic plasticity underlying one-trial learning of event-place associations. In rodents, episodic-like memory (ELM) of personally experienced events can be inferred from behavior that reflects the remembrance of the content (what kind of object was presented), place (where was this object placed), and temporal context (when was the object presented). We have previously shown that that d-cycloserine (DCS), an NMDA-R agonist, ameliorates stress-induced deficits in ELM.
Objectives
In this study, we used an experimental protocol designed to detect promnestic drug effects and investigated whether DCS, which is known to enhance learning and memory, can induce ELM under conditions where mice normally do not show ELM.
Results
Mice that have been treated i.p. with DCS (20 mg/kg) both remembered the temporal order in which two different objects had been encountered during two consecutive sample trials, as well as their spatial position during the sample trials. Most importantly, the test trial performance of these mice is compatible with ELM in terms of an integrated memory for unique experiences comprising “what”, “where”, and “when” information. In contrast, mice that have received either a saline injection or lower doses of DCS (0.2 and 2.0 mg/kg) did not show such an integrated ELM.
Conclusions
To our knowledge, this is the first report showing that DCS can promote ELM in mice.
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Acknowledgment
This work was supported by the Deutsche Forschungsgemeinschaft (DFG) through grant no. DE 1149/1-2 to ED.
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Zlomuzica, A., De Souza Silva, M.A., Huston, J.P. et al. NMDA receptor modulation by d-cycloserine promotes episodic-like memory in mice. Psychopharmacology 193, 503–509 (2007). https://doi.org/10.1007/s00213-007-0816-x
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DOI: https://doi.org/10.1007/s00213-007-0816-x