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Cell Rep. 2017 Jun 27;19(13):2694-2706. doi: 10.1016/j.celrep.2017.06.003.

A Presynaptic Glutamate Receptor Subunit Confers Robustness to Neurotransmission and Homeostatic Potentiation.

Author information

1
Department of Neurobiology, University of Southern California, Los Angeles, CA 90089, USA; USC Neuroscience Graduate Program, University of Southern California, Los Angeles, CA 90089, USA.
2
Department of Neurobiology, University of Southern California, Los Angeles, CA 90089, USA.
3
Section on Neuronal Connectivity, Laboratory of Gene Regulation and Development, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD 20892, USA.
4
Department of Neurobiology, University of Southern California, Los Angeles, CA 90089, USA. Electronic address: dickman@usc.edu.

Abstract

Homeostatic signaling systems are thought to interface with other forms of plasticity to ensure flexible yet stable levels of neurotransmission. The role of neurotransmitter receptors in this process, beyond mediating neurotransmission itself, is not known. Through a forward genetic screen, we have identified the Drosophila kainate-type ionotropic glutamate receptor subunit DKaiR1D to be required for the retrograde, homeostatic potentiation of synaptic strength. DKaiR1D is necessary in presynaptic motor neurons, localized near active zones, and confers robustness to the calcium sensitivity of baseline synaptic transmission. Acute pharmacological blockade of DKaiR1D disrupts homeostatic plasticity, indicating that this receptor is required for the expression of this process, distinct from developmental roles. Finally, we demonstrate that calcium permeability through DKaiR1D is necessary for baseline synaptic transmission, but not for homeostatic signaling. We propose that DKaiR1D is a glutamate autoreceptor that promotes robustness to synaptic strength and plasticity with active zone specificity.

KEYWORDS:

Drosophila; autoreceptor; glutamate receptor; kainate receptor; neuromuscular junction; synaptic homeostasis

PMID:
28658618
PMCID:
PMC5538789
DOI:
10.1016/j.celrep.2017.06.003
[Indexed for MEDLINE]
Free PMC Article

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