Dataset Information

Dynamics of hippocampal protein expression during long-term spatial memory formation

ABSTRACT: Dynamics of hippocampal protein expression during long-term spatial memory formation

INSTRUMENT(S): Synapt MS

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Brain

SUBMITTER: Yishai Levin

LAB HEAD: Izhak Michaelevsky

PROVIDER: PXD002176 | Pride | 2015-12-01

REPOSITORIES: pride

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Dataset's files

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			Action	DRS
	120626_100ngEcoli_MSe_sense_R1.raw.zip	Raw
	Vial_G2_IM_Hip_0_2_F1_1_G2_IM_Hip_0_2_F1.mzid.gz	Mzid
	Vial_G2_IM_Hip_0_2_F1_1_G2_IM_Hip_0_2_F1.mzid_Vial_G2_IM_Hip_0_2_F1_1_G2_IM_Hip_0_2_F1.MGF	Mzid
	Vial_G2_IM_Hip_0_2_F1_1_G2_IM_Hip_0_2_F1.mzid_Vial_G2_IM_Hip_0_2_F1_1_G2_IM_Hip_0_2_F1.pride.mgf.gz	Mzid
	Vial_G2_IM_Hip_0_2_F1_1_G2_IM_Hip_0_2_F1.pride.mztab.gz	Mztab

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Publications

Dynamics of Hippocampal Protein Expression During Long-term Spatial Memory Formation.

Borovok Natalia N Nesher Elimelech E Levin Yishai Y Reichenstein Michal M Pinhasov Albert A Michaelevski Izhak I

Molecular & cellular proteomics : MCP 20151123 2

Spatial memory depends on the hippocampus, which is particularly vulnerable to aging. This vulnerability has implications for the impairment of navigation capacities in older people, who may show a marked drop in performance of spatial tasks with advancing age. Contemporary understanding of long-term memory formation relies on molecular mechanisms underlying long-term synaptic plasticity. With memory acquisition, activity-dependent changes occurring in synapses initiate multiple signal transduct ...[more]

PMID: 26598641

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Project description:Spatial memory depends on the hippocampus, which is particularly vulnerable to aging. This vulnerability has implications for the impairment of navigation capacities in older people, who may show a marked drop in performance of spatial tasks with advancing age. Contemporary understanding of long-term memory formation relies on molecular mechanisms underlying long-term synaptic plasticity. With memory acquisition, activity-dependent changes occurring in synapses initiate multiple signal transduction pathways enhancing protein turnover. This enhancement facilitates de novo synthesis of plasticity related proteins, crucial factors for establishing persistent long-term synaptic plasticity and forming memory engrams. Extensive studies have been performed to elucidate molecular mechanisms of memory traces formation; however, the identity of plasticity related proteins is still evasive. In this study, we investigated protein turnover in mouse hippocampus during long-term spatial memory formation using the reference memory version of radial arm maze (RAM) paradigm. We identified 1592 proteins, which exhibited a complex picture of expression changes during spatial memory formation. Variable linear decomposition reduced significantly data dimensionality and enriched three principal factors responsible for variance of memory-related protein levels at (1) the initial phase of memory acquisition (165 proteins), (2) during the steep learning improvement (148 proteins), and (3) the final phase of the learning curve (123 proteins). Gene ontology and signaling pathways analysis revealed a clear correlation between memory improvement and learning phase-curbed expression profiles of proteins belonging to specific functional categories. We found differential enrichment of (1) neurotrophic factors signaling pathways, proteins regulating synaptic transmission, and actin microfilament during the first day of the learning curve; (2) transcription and translation machinery, protein trafficking, enhancement of metabolic activity, and Wnt signaling pathway during the steep phase of memory formation; and (3) cytoskeleton organization proteins. Taken together, this study clearly demonstrates dynamic assembly and disassembly of protein-protein interaction networks depending on the stage of memory formation engrams.

Project description:Histone deacetylase inhibitors (HDACis) have been shown to potentiate hippocampal-dependent memory and synaptic plasticity and to ameliorate cognitive deficits and degeneration in animal models for different neuropsychiatric conditions. However, the impact of these drugs on hippocampal histone acetylation and gene expression profiles at the genomic level, and the molecular mechanisms that underlie their specificity and beneficial effects in neural tissue, remains obscure. Here, we mapped four relevant histone marks (H3K4me3, AcH3K9,14, AcH4K12 and pan-AcH2B) in hippocampal chromatin and investigated at the whole-genome level the impact of HDAC inhibition on acetylation profiles and basal and activity-driven gene expression. HDAC inhibition caused a dramatic histone hyperacetylation that was largely restricted to active loci pre-marked with H3K4me3 and AcH3K9,14. In addition, the comparison of Chromatin immunoprecipitation sequencing and gene expression profiles indicated that Trichostatin A-induced histone hyperacetylation, like histone hypoacetylation induced by histone acetyltransferase deficiency, had a modest impact on hippocampal gene expression and did not affect the transient transcriptional response to novelty exposure. However, HDAC inhibition caused the rapid induction of a homeostatic gene program related to chromatin deacetylation. These results illuminate both the relationship between hippocampal gene expression and histone acetylation and the mechanism of action of these important neuropsychiatric drugs. Examination of 4 different histone modifications in the hippocampus of vehicle (DMSO/Saline) or HDACi TSA (2.4 mg/kg)-treated mice. Samples were obtained 30 min after intraperitoneal administration of either TSA or Vehicle. NOTE: The ChIPseq experiments described here and those presented in the series GSE44854 were performed in paralell. Therefore, some control samples are part of both datasets (GSM1062434, GSM1062437, GSM1062441 and GSM1062442).