Abstract:
:The distribution of the synaptic vesicle-associated phosphoprotein synapsin I after electrical stimulation of the frog neuromuscular junction was investigated by immunogold labeling and compared with the distribution of the integral synaptic vesicle protein synaptophysin. In resting terminals both proteins were localized exclusively on synaptic vesicles. In stimulated terminals they appeared also in the axolemma and its infoldings, which however exhibited a lower synapsin I/synaptophysin ratio with respect to synaptic vesicles at rest. The value of this ratio was intermediate in synaptic vesicles of stimulated terminals, and an increased synapsin I labeling of the cytomatrix was observed. These results indicate that synapsin I undergoes partial dissociation from and reassociation with synaptic vesicles, following physiological stimulation, and are consistent with the proposed modulatory role of the protein in neurotransmitter release.
journal_name
Neuronjournal_title
Neuronauthors
Torri Tarelli F,Bossi M,Fesce R,Greengard P,Valtorta Fdoi
10.1016/0896-6273(92)90072-lsubject
Has Abstractpub_date
1992-12-01 00:00:00pages
1143-53issue
6eissn
0896-6273issn
1097-4199pii
0896-6273(92)90072-Ljournal_volume
9pub_type
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