Trophic factor-induced activity 'signature' regulates the functional expression of postsynaptic excitatory acetylcholine receptors required for synaptogenesis.

Abstract:

:Highly coordinated and coincidental patterns of activity-dependent mechanisms ("fire together wire together") are thought to serve as inductive signals during synaptogenesis, enabling neuronal pairing between specific sub-sets of excitatory partners. However, neither the nature of activity triggers, nor the "activity signature" of long-term neuronal firing in developing/regenerating neurons have yet been fully defined. Using a highly tractable model system comprising of identified cholinergic neurons from Lymnaea, we have discovered that intrinsic trophic factors present in the Lymnaea brain-conditioned medium (CM) act as a natural trigger for activity patterns in post- but not the presynaptic neuron. Using microelectrode array recordings, we demonstrate that trophic factors trigger stereotypical activity patterns that include changes in frequency, activity and variance. These parameters were reliable indicators of whether a neuron expressed functional excitatory or inhibitory nAChRs and synapse formation. Surprisingly, we found that the post- but not the presynaptic cell exhibits these changes in activity patterns, and that the functional expression of excitatory nAChRs required neuronal somata, de novo protein synthesis and voltage gated calcium channels. In summary, our data provides novel insights into trophic factor mediated actions on neuronal activity and its specific regulation of nAChR expression.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Luk CC,Lee AJ,Wijdenes P,Zaidi W,Leung A,Wong NY,Andrews J,Syed NI

doi

10.1038/srep09523

subject

Has Abstract

pub_date

2015-04-01 00:00:00

pages

9523

issn

2045-2322

pii

srep09523

journal_volume

5

pub_type

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