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Brain synaptosomes harbor more than one cytoplasmic system of protein synthesis
Author(s) -
Cefaliello Carolina,
Eyman Maria,
Melck Dominique,
De Stefano Rosanna,
Ferrara Eugenia,
Crispino Marianna,
Giuditta Antonio
Publication year - 2014
Publication title -
journal of neuroscience research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.72
H-Index - 160
eISSN - 1097-4547
pISSN - 0360-4012
DOI - 10.1002/jnr.23435
Subject(s) - translation (biology) , cytoplasm , extracellular , synaptosome , protein biosynthesis , mitochondrion , calcium , synaptic plasticity , biophysics , chemistry , neuroscience , biology , biochemistry , microbiology and biotechnology , central nervous system , messenger rna , receptor , organic chemistry , gene
Synaptosomal protein synthesis from rat brain is selectively increased by learning and is massively enhanced during the recovery period from brain ischemia. To lay the groundwork for identification of the involved synaptic elements, we examined the effects induced by varying the concentrations of extracellular cations and endogenous calcium. Most of the recorded rate response curves exhibited biphasic profiles that suggested the presence of more than one translation system. Because comparable profiles were obtained by fully inhibiting mitochondrial translation, the data indicated the involvement of cytoplasmic translation systems present in different synaptosomal classes. Their properties may be individually investigated by exploiting the partially inhibited conditions we have described. The identification of the synaptic elements from which they originated and their newly synthesized proteins will significantly expand our understanding of the synaptic contribution to brain plastic events. © 2014 Wiley Periodicals, Inc.