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Journal Article
Research Support, Non-U.S. Gov't
The role of telencephalic NO and cGMP in avoidance conditioning in goldfish (Carassius auratus).
Behavioral Neuroscience 2009 June
Our previous study with N-methyl-D-aspartate (NMDA) receptor antagonist D-AP5 suggested that NMDA receptors were involved in learning but not memory consolidation of avoidance conditioning. The present study investigated whether nitric oxide (NO) and cyclic guanosine monophosphate (cGMP) were involved in memory consolidation but not learning of avoidance conditioning in goldfish. Experiments 1 to 3 investigated amnestic and performance effects of NO inhibitor L-NAME and cGMP inhibitor LY-83583. Experiment 4 investigated whether posttraining intratelencephalic injection of NO donor SNAP ameliorated anterograde amnestic effects of pretraining NO inhibitor L-NAME. The results showed that L-NAME and LY-83583 produced significant anterograde and retrograde amnesia at doses that did not impair performance processes, and the drugs produced more severe retrograde than anterograde amnesia. Furthermore, posttraining SNAP significantly ameliorated anterograde amnestic effects of pretraining L-NAME. Thus, our previous results with D-AP5 and current results with L-NAME and LY-83583 together suggest that the NMDA receptors are involved in learning or the process that is completed during training, whereas the NO and cGMP are involved in memory consolidation or the process that is normally completed sometime following the learning experience.
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