Chemical stimulation of synaptosomes modulates alpha -Ca2+/calmodulin-dependent protein kinase II mRNA association to polysomes.
J Neurosci
; 20(10): RC76, 2000 May 15.
Article
em En
| MEDLINE
| ID: mdl-10783400
ABSTRACT
The presence of specific mRNAs in dendrites and at synapses is well established, but a direct and reliable demonstration that they are associated with polysomes is still missing. To address this point we analyzed the polysomal association of the mRNAs for the alpha-subunit of Ca(2+)/calmodulin-dependent protein kinase II (alpha-CaMKII), for type 1 inositol 1,4,5-trisphosphate receptor (InsP3R1) and for the activity-regulated cytoskeleton-associated protein (Arc) in a synaptosomal preparation devoid of contaminating material from neuronal and glial perikarya. We show that a fraction of alpha-CaMKII, InsP3R1, and Arc mRNAs present in synaptosomes is indeed associated with polysomes. Moreover, we show that polysomal association of alpha-CaMKII mRNA, but not InsP3R1 and Arc mRNAs, increases with depolarization of the synaptosomal membrane. Finally, we show that the synthesis of alpha-CaMKII protein increases with stimulation. Dendritic mRNA recruitment onto polysomes in response to synaptic stimulation might represent one of the mechanisms underlying the processes of learning and memory.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Polirribossomos
/
Sinaptossomos
/
RNA Mensageiro
/
Proteínas Quinases Dependentes de Cálcio-Calmodulina
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2000
Tipo de documento:
Article