The participation of the Medial prefrontal cortex in reconsolidation and extinction processes of the aversive conditioned memory: possible interaction between glutamate - nitric oxide pathway and the endocanabinoids
For nearly a century the study of neural and biochemical mechanisms that concern the different processes of learning using Pavlovian aversive conditioning, which consists in associating a neutral stimulus (eg, sound or context) with an unconditioned stimulus (eg shock paws). Recently it has been observed a growing interest in the mechanisms involving the processes of reconsolidation and extinction of aversive memory, as therapies for the treatment of anxiety disorders based on these processes. Strong evidence shows that the ventral portion of the medial prefrontal cortex (vMPFC) is involved in the modulation of processes involving learning and memory, especially in the processes of expression and extinction of conditioned emotional response (CER). Apparently there is an interaction between glutamate, nitric oxide (NO) and the endocanabionóides vMPFC. This interaction appears to be important for the expression and extinction of the REC in several models, however, the study of this interaction in the pre-limbic portions (PL) and infra-limbic (IL) of vCPFM in the processes of reconsolidation and extinction of contextual aversive memory still not been studied. For that will be used Wistar rats that were previously submitted to the implantation of a radio-telemetry probe for recording autonomic activity and guide cannulas in the PL or IL portions of the vMPFC for drug administration. It will be used a conditioning to context protocol followed by reconsolidation or extinction sessions of the aversive memory. The administration of drugs that interfere with the action of endocannabinoids or glutamate-NO pathway will be made before the sessions reconsolidation or extinction. Finally, the day of the test will assess the effects of pharmacological manipulation of the processes of reconsolidation and extinction of contextual aversive memory.
News published in Agência FAPESP Newsletter about the scholarship: