Post-reexposure administration of D-cycloserine facilitates reconsolidation of contextual conditioned fear memory in rats.

The effect of D-cycloserine, a N-methyl-D-aspartate receptor partial agonist, on the reconsolidation of conditioned fear memory is not precisely understood. In this study, we clarified the effects of D-cycloserine on the reconsolidation in rats, by performing contextual fear conditioning with a mild fear-conditioning procedure and with post-reexposure administration of the drug. The D-cycloserine (15 mg/kg subcutaneously)-treated rats showed a persistent and greater fear response during the test session compared with the control group. In conclusion, we have confirmed that post-reexposure administration of D-cycloserine facilitates the reconsolidation of fear memory in rats.