GHRP-6
Growth Hormone Releasing Peptide-6, Growth hormone-releasing hexapeptide, His-D-Trp-Ala-Trp-D-Phe-Lys-NH2
Intrahippocampal injection of Cortistatin-14 impairs recognition memory consolidation in mice through activation of sst<sub>2</sub>, ghrelin and GABA<sub>A/B</sub> receptors.
Jiang. Jinhong J; Peng. Yali Y; He. Zhen Z; Wei. Lijuan L; Jin. Weidong W; Wang. Xiaoli X; Chang. Min M
Key Findings
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Practical Outcomes
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Summary
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Abstract
Cortistatin-14 (CST-14), a neuropeptide related to somatostatin, is primarily localized within the cortex and hippocampus. In the hippocampus, CST-14 inhibits CA1 neuronal pyramidal cell firing and co-exists with GABA. However, its role in cognitive is still not clarified. The first aim of our study was to elucidate the role of CST-14 signaling in consolidation and reconsolidation of recognition memory in mice, using novel object recognition task. The results showed that central CST-14 induced in impairment of long-term and short-term recognition memory, indicating memory consolidation impairment effect. Similarly, we found that CST-14 did not impaired long-term and short-term reconsolidation recognition memory. To further investigate the underlying mechanisms of CST-14 in memory process, we used cyclosomatostatin (c-SOM, a selective sst<sub>1-5</sub> receptor antagonist), cyanamid154806 (a selective sst<sub>2</sub> receptor antagonist), ODN-8 (a high affinity and selectivity compound for sst<sub>3</sub> receptor), [d-Lys<sub>3</sub>]GHRP-6 (a selective ghrelin receptor antagonist), picrotoxin (PTX, a GABA<sub>A</sub> receptor antagonist), and sacolfen (a GABA<sub>B</sub> receptor antagonist) to research its effects in recognition. Our results firstly indicated that the memory-impairing effects of CST-14 were significantly reversed by c-SOM, cyanamid154806, [d-Lys<sub>3</sub>]GHRP-6, PTX and sacolfen, but not ODN-8, suggesting that the blockage of recognition memory consolidation induced by CST-14 involves sst<sub>2</sub>, ghrelin and GABA system. The present study provides a potential strategy to regulate memory processes, providing new evidence that reconsolidation is not a simple reiteration of consolidation.
Study Information
pubmed
2017
2017-05-03T00:00:00.000Z
10.1016/j.brainres.2017.04.017
11
57