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Elife. 2018 Apr 5;7. pii: e34338. doi: 10.7554/eLife.34338.

Synapse-specific and compartmentalized expression of presynaptic homeostatic potentiation.

Author information

1
Department of Neurobiology, University of Southern California, Los Angeles, United States.
2
Neuroscience Graduate Program, University of Southern California, California, United States.
3
Graduate Program in Molecular and Computational Biology, University of Southern California, California, United States.

Abstract

Postsynaptic compartments can be specifically modulated during various forms of synaptic plasticity, but it is unclear whether this precision is shared at presynaptic terminals. Presynaptic homeostatic plasticity (PHP) stabilizes neurotransmission at the Drosophila neuromuscular junction, where a retrograde enhancement of presynaptic neurotransmitter release compensates for diminished postsynaptic receptor functionality. To test the specificity of PHP induction and expression, we have developed a genetic manipulation to reduce postsynaptic receptor expression at one of the two muscles innervated by a single motor neuron. We find that PHP can be induced and expressed at a subset of synapses, over both acute and chronic time scales, without influencing transmission at adjacent release sites. Further, homeostatic modulations to CaMKII, vesicle pools, and functional release sites are compartmentalized and do not spread to neighboring pre- or post-synaptic structures. Thus, both PHP induction and expression mechanisms are locally transmitted and restricted to specific synaptic compartments.

KEYWORDS:

D. melanogaster; homeostatic; neuromuscular junction; neuroscience; plasticity; synapse; synaptic terminals

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