Activation of protein kinase A (PKA) pathway at presynaptic terminals plays a crucial role in the supply of synaptic vesicles (SVs) from the reserve pool, affecting the steady-state level of activity and the reconstitution of the readily releasable pool after intense stimulation. However, the identity of the stimuli activating this pathway is undefined. Using fluorescence resonance energy transfer and molecular genetic, we show that kainate, through the activation of presynaptic kainate receptors, induces PKA activation and enhances synapsin I phosphorylation at PKA-specific residues. This leads to a dispersion of synapsin I immunoreactivity, which is accompanied by a PKA-dependent increase in the rate of SV recycling at the growth cone and by an enhanced miniature excitatory postsynaptic currents frequency in mature networks. Selective activation of this pathway is induced by the native neurotransmitter glutamate, when applied in the high nanomolar range. These data identify glutamate, specifically acting on KARs, as one of the stimuli able to induce phosphorylation of synapsin at PKA sites, both at the axonal growth cone and at the mature synapse, thus increasing SV availability and contributing to plasticity phenomena.

Kainate induces mobilization of synaptic vesicles at the growth cone through the activation of protein kinase A / G. Gelsomino, E. Menna, F. Antonucci, S. Rodighiero, L. Riganti, C. Mulle, F. Benfenati, F. Valtorta, C. Verderio, M. Matteoli. - In: CEREBRAL CORTEX. - ISSN 1047-3211. - 23:3(2013 Mar), pp. 531-541.

Kainate induces mobilization of synaptic vesicles at the growth cone through the activation of protein kinase A

G. Gelsomino;E. Menna;F. Antonucci;S. Rodighiero;L. Riganti;M. Matteoli
2013-03

Abstract

Activation of protein kinase A (PKA) pathway at presynaptic terminals plays a crucial role in the supply of synaptic vesicles (SVs) from the reserve pool, affecting the steady-state level of activity and the reconstitution of the readily releasable pool after intense stimulation. However, the identity of the stimuli activating this pathway is undefined. Using fluorescence resonance energy transfer and molecular genetic, we show that kainate, through the activation of presynaptic kainate receptors, induces PKA activation and enhances synapsin I phosphorylation at PKA-specific residues. This leads to a dispersion of synapsin I immunoreactivity, which is accompanied by a PKA-dependent increase in the rate of SV recycling at the growth cone and by an enhanced miniature excitatory postsynaptic currents frequency in mature networks. Selective activation of this pathway is induced by the native neurotransmitter glutamate, when applied in the high nanomolar range. These data identify glutamate, specifically acting on KARs, as one of the stimuli able to induce phosphorylation of synapsin at PKA sites, both at the axonal growth cone and at the mature synapse, thus increasing SV availability and contributing to plasticity phenomena.
kainate receptors; PKA; presynaptic terminal; synapsin I; synaptic vesicles recycling; Animals; Cells, Cultured; Cyclic AMP-Dependent Protein Kinases; Enzyme Activation; Excitatory Amino Acid Agonists; Excitatory Postsynaptic Potentials; Female; Fluorescence Resonance Energy Transfer; Glutamic Acid; Growth Cones; Hippocampus; Immunohistochemistry; Kainic Acid; Neuronal Plasticity; Neurons; Patch-Clamp Techniques; RNA, Small Interfering; Rats; Rats, Sprague-Dawley; Receptors, Kainic Acid; Synapsins; Synaptic Vesicles; Cognitive Neuroscience; Cellular and Molecular Neuroscience
Settore BIO/14 - Farmacologia
7-mar-2012
CEREBRAL CORTEX
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/254854
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