Abstract:
:It has been reported that training in behavioral tasks modifies the ability to induce long-term potentiation (LTP) in an N-methyl-D-aspartate receptor (NMDAR)-dependent manner. This receptor leads to calcium entry into neuronal cells, promoting the activation of protein kinases as protein kinase A (PKA) and protein kinase C (PKC), which contribute significantly to the formation of different types of memories and play a pivotal role in the expression of LTP. Our previous studies involving the insular cortex (IC) have demonstrated that induction of LTP in the basolateral amygdaloid nucleus (BLA)-IC projection prior to conditioned taste aversion (CTA) training enhances the retention of this task. Recently, we showed that CTA training triggers a persistent impairment in the ability to induce subsequent synaptic plasticity on the BLA-IC pathway in a protein synthesis-dependent manner, but the underlying molecular mechanisms remain unclear. In the present study we investigated whether the blockade of NMDAR, as well as the inhibition of PKC and PKA affects the CTA-dependent impairment of the IC-LTP. Thus, CTA-trained rats received high frequency stimulation in the Bla-IC projection in order to induce LTP 48 h after the aversion test. The NMDAR antagonist CPP and the specific inhibitors for PKC (chelerythrine) and PKA (KT-5720) were intracortically administered during the acquisition session. Our results show that the blockade of NMDAR and the inhibition of PKC activity prevent the CTA memory-formation as well as the IC-LTP impairment. Nevertheless, PKA inhibition prevents the memory formation of taste aversion but produces no interference with the CTA-dependent impairment of the IC-LTP. These findings reveal the differential roles of protein kinases on CTA-dependent modification of IC-LTP enhancing our understanding of the effects of memory-related changes on synaptic function.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Rodríguez-Durán LF,Escobar MLdoi
10.1016/j.bbr.2014.02.049subject
Has Abstractpub_date
2014-06-01 00:00:00pages
58-62eissn
0166-4328issn
1872-7549pii
S0166-4328(14)00146-6journal_volume
266pub_type
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