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HCNP precursor protein transgenic mice display a depressive-like phenotype in old age. | LitMetric

AI Article Synopsis

Article Abstract

We have previously reported a novel peptide, hippocampal cholinergic neurostimulating peptide (HCNP), which induces acetylcholine synthesis by increasing the amount of cholineacetyltransferase (ChAT) in medial septal nuclei. The HCNP precursor protein, composed of 186 amino acids, is an inhibitory factor of the c-Raf/ MEK cascade and may be involved in the development of the fetal rat brain via the inhibition of Erk phosphorylation. To clarify the involvement of HCNP in hippocampal cholinergic circuitry, we previously generated HCNP precursor protein (HCNP-pp) transgenic mice using the promoter of the alpha subunit of Ca(2+) calmodulin-dependent protein kinase II (CaMKIIalpha). These mice showed increased levels of ChAT in medial septal nuclei. Here, we investigated the behavioral phenotype of these mice, such as locomotor activity, mood and working/spatial memory. We demonstrate that HCNP-pp transgenic mice show a depressive-like phenotype at 30 weeks of age, but not at 12 weeks of age. We suggest that either HCNP and/or HCNP precursor protein may evoke the depressive-like phenotype via cholinergic hyperactivity from early neonatal life and/or inhibition of phosphorylated Erk in the neonatal hippocampus.

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http://dx.doi.org/10.1016/j.brainres.2010.06.041DOI Listing

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