Presynaptic activation of silent synapses and growth of new synapses contribute to intermediate and long-term facilitation in Aplysia.

Abstract:

:The time course and functional significance of the structural changes associated with long-term facilitation of Aplysia sensory to motor neuron synaptic connections in culture were examined by time-lapse confocal imaging of individual sensory neuron varicosities labeled with three different fluorescent markers: the whole-cell marker Alexa-594 and two presynaptic marker proteins-synaptophysin-eGFP to monitor changes in synaptic vesicle distribution and synapto-PHluorin to monitor active transmitter release sites. Repeated pulses of serotonin induce two temporally, morphologically, and molecularly distinct presynaptic changes: (1) a rapid activation of silent presynaptic terminals by filling of preexisting empty varicosities with synaptic vesicles, which parallels intermediate-term facilitation, is completed within 3-6 hr and requires translation but not transcription and (2) a slower generation of new functional varicosities which occurs between 12-18 hr and requires transcription and translation. Enrichment of empty varicosities with synaptophysin accounts for 32% of the newly activated synapses at 24 hr, whereas newly formed varicosities account for 68%.

journal_name

Neuron

journal_title

Neuron

authors

Kim JH,Udo H,Li HL,Youn TY,Chen M,Kandel ER,Bailey CH

doi

10.1016/s0896-6273(03)00595-6

subject

Has Abstract

pub_date

2003-09-25 00:00:00

pages

151-65

issue

1

eissn

0896-6273

issn

1097-4199

pii

S0896627303005956

journal_volume

40

pub_type

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