ZFIN ID: ZDB-PUB-190611-11
Robo2 regulates synaptic oxytocin content by affecting actin dynamics
Anbalagan, S., Blechman, J., Gliksberg, M., Gordon, L., Rotkopf, R., Dadosh, T., Shimoni, E., Levkowitz, G.
The regulation of neuropeptide level at the site of release is essential for proper neurophysiological functions. We focused on a prominent neuropeptide, oxytocin (OXT) in the zebrafish as an in vivo
model to visualize and quantify OXT content at the resolution of a single synapse. We found that OXT-loaded synapses were enriched with polymerized actin. Perturbation of actin filaments by either cytochalasin-D or conditional Cofilin expression resulted in decreased synaptic OXT levels. Genetic loss of robo2
displayed decreased synaptic OXT content and robo2
mutants displayed reduced mobility of the actin probe Lifeact-EGFP in OXT synapses.Using a novel transgenic reporter allowing real-time monitoring of OXT-loaded vesicles, we showed that robo2
mutants display slower rate of vesicles accumulation. OXT-specific expression of dominant-negative Cdc42, which is a key regulator of actin dynamics and a downstream effector of Robo2, led to a dose-dependent increase in OXT content in WT, and a dampened effect in robo2
mutants. Our results link Slit3-Robo2-Cdc42, which controls local actin dynamics, with the maintenance of synaptic neuropeptide levels.
No data available