PUBLICATION

In Vivo Measurement of Glycine Receptor Turnover and Synaptic Size Reveals Differences between Functional Classes of Motoneurons in Zebrafish

Authors
Chow, D.M., Zuchowski, K.A., Fetcho, J.R.
ID
ZDB-PUB-170419-9
Date
2017
Source
Current biology : CB   27(8): 1173-1183 (Journal)
Registered Authors
Fetcho, Joseph R.
Keywords
Dendra2, FRAP, glycine, motoneuron, motor, photoconversion, receptor, spinal cord, synapse, zebrafish
MeSH Terms
  • Animals
  • Motor Neurons/physiology*
  • Receptors, Glycine/metabolism*
  • Synapses/physiology*
  • Synaptic Transmission/physiology*
  • Zebrafish/growth & development
  • Zebrafish/physiology*
  • Zebrafish Proteins/metabolism*
PubMed
28416115 Full text @ Curr. Biol.
Abstract
The interplay between binding and unbinding of synaptic receptor proteins at synapses plays an important role in determining receptor concentration and synaptic strength, with known links between changes in binding kinetics and synaptic plasticity. The regulation of such kinetics may subserve the specific functional requirements of neurons in intact circuits. However, the majority of studies of synaptic turnover kinetics have been performed in cultured neurons outside the context of normal circuits, and synaptic receptor turnover has not been measured at individual synaptic sites in vivo. We quantified the distribution of glycinergic receptor dynamics using fluorescence recovery after photoconversion of synapses in intact zebrafish and correlated recovery kinetics to synaptic volume in two functionally distinct classes of cells: primary and secondary motoneurons. The rate of fluorescence recovery after photoconversion decreased with synaptic volume in both types of motoneurons, with larger synapses having slower recovery. Primary motoneurons had both larger synapses and associated slower recovery times than secondary motoneurons. Our results suggest that synaptic kinetics are regulated in concert with synaptic sizes and reflect the functional role played by neurons within their circuit.
Genes / Markers
Figures
Expression
Phenotype
Mutation and Transgenics
Human Disease / Model Data
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping
Errata and Notes