Phosphorylation changes of CaMKII, ERK1/2, PKB/Akt kinases and CREB activation during early long-term potentiation at Schaffer collateral-CA1 mouse hippocampal synapses.
Neurochem Res
; 35(2): 239-46, 2010 Feb.
Article
en En
| MEDLINE
| ID: mdl-19731018
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 alphaCaMKII, 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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Sinapsis
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Proteína de Unión a Elemento de Respuesta al AMP Cíclico
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Potenciación a Largo Plazo
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Proteína Quinasa 1 Activada por Mitógenos
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Proteína Quinasa 3 Activada por Mitógenos
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Proteínas Proto-Oncogénicas c-akt
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Proteína Quinasa Tipo 2 Dependiente de Calcio Calmodulina
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Hipocampo
Límite:
Animals
Idioma:
En
Revista:
Neurochem Res
Año:
2010
Tipo del documento:
Article
País de afiliación:
Italia
Pais de publicación:
Estados Unidos