Vti1a/b regulate synaptic vesicle and dense core vesicle secretion via protein sorting at the Golgi

Nature Communications
Javier Emperador-MeleroMatthijs Verhage

Abstract

The SNAREs Vti1a/1b are implicated in regulated secretion, but their role relative to canonical exocytic SNAREs remains elusive. Here, we show that synaptic vesicle and dense-core vesicle (DCV) secretion is indeed severely impaired in Vti1a/b-deficient neurons. The synaptic levels of proteins that mediate secretion were reduced, down to 50% for the exocytic SNARE SNAP25. The delivery of SNAP25 and DCV-cargo into axons was decreased and these molecules accumulated in the Golgi. These defects were rescued by either Vti1a or Vti1b expression. Distended Golgi cisternae and clear vacuoles were observed in Vti1a/b-deficient neurons. The normal non-homogeneous distribution of DCV-cargo inside the Golgi was lost. Cargo trafficking out of, but not into the Golgi, was impaired. Finally, retrograde Cholera Toxin trafficking, but not Sortilin/Sorcs1 distribution, was compromised. We conclude that Vti1a/b support regulated secretion by sorting secretory cargo and synaptic secretion machinery components at the Golgi.

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Citations

Sep 23, 2020·Journal of Cellular Physiology·Bor L Tang
Jul 1, 2020·The Journal of Clinical Investigation·Lakshya BajajMarco Sardiello
Dec 2, 2020·Journal of Neurochemistry·Annemiek A van BerkelMatthijs Verhage
Jun 11, 2020·Cell Reports·Hajnalka NyitraiPascal S Kaeser
Feb 23, 2021·Asian Journal of Pharmaceutical Sciences·Huan WangChangyou Zhan
Apr 28, 2021·Proceedings of the National Academy of Sciences of the United States of America·Rhodé van WestenMatthijs Verhage
Apr 19, 2021·Advances in Biological Regulation·Cheng-I Jonathan MaJulie A Brill
May 23, 2021·Science Advances·Alessandro MoroMatthijs Verhage
Jul 13, 2021·Bio-protocol·Cheng-I J Ma, Julie A Brill
Oct 3, 2021·Journal of Neurochemistry·Wan-Ru LiClaire Xi Zhang

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Datasets Mentioned

BETA
GM130
GM130-
GTX75953

Methods Mentioned

BETA
cesarean section
transfection
immunoprecipitations

Software Mentioned

Axiovision
Matlab
pCLAMP
ImageJ
NisElements

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