Phosphorylation Changes of CaMKII, ERK1/2, PKB/Akt Kinases and CREB Activation during Early Long-Term Potentiation at Schaffer Collateral-CA1 Mouse Hippocampal Synapses

Mauro Racaniello, Alessio Cardinale, Cristiana Mollinari, Margherita D'Antuono, Giovanna De Chiara, Virginia Tancredi, Daniela Merlo

Research output: Contribution to journalArticle

Abstract

Protein phosphorylation is the main signaling system known to trigger synaptic changes underlying long-term potentiation (LTP). The timing of these phosphorylations plays an essential role to maintain the potentiated state of synapses. However, in mice a simultaneous analysis of phosphorylated proteins during early-LTP (E-LTP) has not been thoroughly carried out. Here we described phosphorylation changes of αCaMKII, ERK1/2, PKB/Akt and CREB at different times after E-LTP induced at Schaffer collateral/commissural fiber-CA1 synapses by 1 s 100 Hz tetanic stimulation in mouse hippocampal slices. We found that phosphorylation levels of all the molecules examined rapidly increased after tetanisation and remained above the basal level up to 30 min. Notably, we observed a sustained increment in the phosphorylation level of Akt at Ser473, whereas the phosphorylation level of Akt at Thr308 was unchanged. Unexpectedly, we also detected a marked increase of CREB target genes expression levels, c-fos, Egr-1 and exon-III containing BDNF transcripts. Our findings, besides providing a detailed timing of phosphorylation of the major kinases involved in E-LTP in mice, revealed that a modest LTP induction paradigm specifically triggers CREB-mediated gene expression.

Original languageEnglish
Pages (from-to)239-246
Number of pages8
JournalNeurochemical Research
Volume35
Issue number2
DOIs
Publication statusPublished - Feb 2010

Keywords

  • Early-long term potentiation
  • Gene expression
  • Mouse hippocampal slices
  • Protein phosphorylation

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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