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Ohi Y, Kato D, Mizuno M, Sato T, Ueki Y, Borlongan CV, Ojika K, Haji A, Matsukawa N. Enhancement of long-term potentiation via muscarinic modulation in the hippocampus of HCNP precursor transgenic mice. Neurosci Lett 2015; 597:1-6. [PMID: 25899776 DOI: 10.1016/j.neulet.2015.04.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 03/26/2015] [Accepted: 04/15/2015] [Indexed: 10/23/2022]
Abstract
Hippocampal cholinergic neurostimulating peptide (HCNP) regulates acetylcholine synthesis in the septal hippocampus through the quantitative increase of choline acetyltransferase levels in the septal nucleus both in vitro and in vivo. Additionally, HCNP-precursor protein transgenic (HCNP-pp Tg) mice display depressive behavior. To examine the physiological function of HCNP and/or HCNP-pp on hippocampal neural activity, we investigated whether overexpression of HCNP-pp strengthened the efficiency of neural activity in the hippocampus. Long-term potentiation (LTP) of excitatory synaptic transmission was induced by a tetanic stimulation of the Schaffer collateral-commissural fibers (SCs) in mouse hippocampal slices. LTP in HCNP-pp Tg mice was significantly enhanced when compared with wild-type littermate (WT) mice. This facilitation of LTP in HCNP-pp Tg mice was blocked by atropine or pirenzepine, but not by mecamylamine. In contrast, LTP in WT mice was not affected by atropine, but enhanced by carbachol. However, neither difference in the input-output relationship of field excitatory postsynaptic potentials nor in the facilitation ratio in paired-pulse stimulation of the SCs was observed between HCNP-pp Tg and WT mice, indicating that presynaptic glutamate release in HCNP-pp Tg mice is similar to that of WT mice. These results suggest that muscarinic (M1) modulation of glutamatergic postsynaptic function may be involved in strengthening LTP in HCNP-pp Tg mice.
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Affiliation(s)
- Yoshiaki Ohi
- Laboratory of Neuropharmacology, School of Pharmacy, Aichi Gakuin University, 1-100 Kusumoto, Chikusa-ku, Nagoya 464-8650, Japan
| | - Daisuke Kato
- Department of Neurology, School of Medicine, Nagoya City University, 1 Kawasumi, Mizuho-ku, Nagoya 467-8602, Japan
| | - Masayuki Mizuno
- Department of Neurology, School of Medicine, Nagoya City University, 1 Kawasumi, Mizuho-ku, Nagoya 467-8602, Japan
| | - Toyohiro Sato
- Department of Neurology, School of Medicine, Nagoya City University, 1 Kawasumi, Mizuho-ku, Nagoya 467-8602, Japan
| | - Yoshino Ueki
- Department of Neurology, School of Medicine, Nagoya City University, 1 Kawasumi, Mizuho-ku, Nagoya 467-8602, Japan
| | - Cesario V Borlongan
- Center of Excellence for Aging and Brain Repair, Department of Neurosurgery and Repair, University of South Florida, Tampa, Florida, USA
| | - Kosei Ojika
- Department of Neurology, School of Medicine, Nagoya City University, 1 Kawasumi, Mizuho-ku, Nagoya 467-8602, Japan
| | - Akira Haji
- Laboratory of Neuropharmacology, School of Pharmacy, Aichi Gakuin University, 1-100 Kusumoto, Chikusa-ku, Nagoya 464-8650, Japan
| | - Noriyuki Matsukawa
- Department of Neurology, School of Medicine, Nagoya City University, 1 Kawasumi, Mizuho-ku, Nagoya 467-8602, Japan.
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Tat-Collapsin Response Mediator Protein 2 (CRMP2) Increases the Survival of Neurons After NMDA Excitotoxity by Reducing the Cleavage of CRMP2. Neurochem Res 2013; 38:2095-104. [DOI: 10.1007/s11064-013-1118-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Revised: 07/22/2013] [Accepted: 07/25/2013] [Indexed: 10/26/2022]
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Mizuno M, Kato D, Kanamori T, Toyoda T, Suzuki T, Ojika K, Matsukawa N. Phosphorylation of collapsin response mediator protein-2 regulates its localization and association with hippocampal cholinergic neurostimulating peptide precursor in the hippocampus. Neurosci Lett 2012; 535:122-7. [PMID: 23276635 DOI: 10.1016/j.neulet.2012.12.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 12/07/2012] [Accepted: 12/12/2012] [Indexed: 11/15/2022]
Abstract
Hippocampal cholinergic neurostimulating peptide (HCNP) induces the synthesis of acetylcholine in the medial septal nucleus in vitro and in vivo. The precursor, HCNP-pp, is a multifunctional protein participating in important signaling pathways, such as MAPK/ERK kinase (MEK) and G-protein-coupled receptor kinase 2 (GRK2). We recently demonstrated that HCNP-pp colocalizes with collapsin response mediator protein-2 (CRMP-2) at presynaptic terminals in the hippocampus, suggesting that HCNP-pp may play an important role in presynaptic function in association with CRMP-2. To clarify the involvement of phosphorylation in regulating the interaction between HCNP-pp and CRMP-2, we investigated the colocalization of HCNP-pp with unphosphorylated- and/or phosphorylated-CRMP-2 (pCRMP-2) at presynaptic terminals. We further determined if the phosphorylation of CRMP-2 affects the binding between those proteins. Here, we demonstrate that HCNP-pp predominantly colocalizes and associates with unphosphorylated and/or pSer-522-CRMP-2 at presynaptic terminals in the hippocampus. Interestingly, HCNP-pp does not associate with pThr-509/514-CRMP-2, which is primarily localized at postsynaptic terminals. These findings suggest that HCNP-pp, in association with unphosphorylated and/or pSer522-CRMP-2, plays an important role in presynaptic function in the mature hippocampus.
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Affiliation(s)
- Masayuki Mizuno
- Department of Neurology, Nagoya City University, 1 Kawasumi, Mizuho-ku, Nagoya 467-8601, Japan
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Kato D, Mitake S, Mizuno M, Kanamori T, Suzuki T, Ojika K, Matsukawa N. Co-localization of hippocampal cholinergic neurostimulating peptide precursor with collapsin response mediator protein-2 at presynaptic terminals in hippocampus. Neurosci Lett 2012; 517:92-7. [PMID: 22542739 DOI: 10.1016/j.neulet.2012.04.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 03/21/2012] [Accepted: 04/11/2012] [Indexed: 11/18/2022]
Abstract
Hippocampal cholinergic neurostimulating peptide (HCNP) induces the synthesis of acetylcholine in medial septal nucleus in vitro and in vivo. HCNP precursor protein (HCNP-pp) is a multifunctional protein that participates in a number of signaling pathways, including MAPK/extracellular signal and G-protein-coupled receptor kinase 2. We recently demonstrated that the amount of collapsin response mediator protein-2 (CRMP-2) is increased in hippocampus of HCNP-pp transgenic mice. To clarify the interaction between HCNP/HCNP-pp and CRMP-2 and its role in synaptic function, we investigated whether HCNP-pp is localized to the synapse and if it affects protein expression. Here, we demonstrate that HCNP-pp co-localizes with CRMP-2 at presynaptic terminals. Furthermore, HCNP-pp overexpression increases synaptophysin levels. These findings suggest that HCNP-pp, in association with CRMP-2, plays an important role in presynaptic function in the hippocampus.
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Affiliation(s)
- Daisuke Kato
- Department of Neurology, Nagoya City University, 1 Kawasumi, Nagoya 467-8601, Japan
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Di Domenico F, Sultana R, Barone E, Perluigi M, Cini C, Mancuso C, Cai J, Pierce WM, Butterfield DA. Quantitative proteomics analysis of phosphorylated proteins in the hippocampus of Alzheimer's disease subjects. J Proteomics 2011; 74:1091-103. [PMID: 21515431 DOI: 10.1016/j.jprot.2011.03.033] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 03/07/2011] [Accepted: 03/31/2011] [Indexed: 01/20/2023]
Abstract
Phosphorylation on tyrosine, threonine and serine residues represents one of the most important post-translational modifications and is a key regulator of cellular signaling of multiple biological processes that require a strict control by protein kinases and protein phosphatases. Abnormal protein phosphorylation has been associated with several human diseases including Alzheimer's disease (AD). One of the characteristic hallmarks of AD is the presence of neurofibrillary tangles, composed of microtubule-associated, abnormally hyperphosphorylated tau protein. However, several others proteins showed altered phosphorylation levels in AD suggesting that deregulated phosphorylation may contribute to AD pathogenesis. Phosphoproteomics has recently gained attention as a valuable approach to analyze protein phosphorylation, both in a quantitative and a qualitative way. We used the fluorescent phosphospecific Pro-Q Diamond dye to identify proteins that showed alterations in their overall phosphorylation in the hippocampus of AD vs. control (CTR) subjects. Significant changes were found for 17 proteins involved in crucial neuronal process such as energy metabolism or signal transduction. These phosphoproteome data may provide new clues to better understand molecular pathways that are deregulated in the pathogenesis and progression of AD.
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Affiliation(s)
- Fabio Di Domenico
- Department of Chemistry, Center of Membrane Sciences, Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40506-0055, USA
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