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PLoS Biol. 2017 Apr 17;15(4):e2000931. doi: 10.1371/journal.pbio.2000931. eCollection 2017 Apr.

A Ca2+ channel differentially regulates Clathrin-mediated and activity-dependent bulk endocytosis.

Author information

1
Institute of Biological Chemistry, Academia Sinica, Nankang, Taipei, Taiwan.
2
Neuroscience Program in Academia Sinica, Academia Sinica, Nankang, Taipei, Taiwan.
3
Institute of Biochemical Sciences, College of Life Science, National Taiwan University, Taipei, Taiwan.

Abstract

Clathrin-mediated endocytosis (CME) and activity-dependent bulk endocytosis (ADBE) are two predominant forms of synaptic vesicle (SV) endocytosis, elicited by moderate and strong stimuli, respectively. They are tightly coupled with exocytosis for sustained neurotransmission. However, the underlying mechanisms are ill defined. We previously reported that the Flower (Fwe) Ca2+ channel present in SVs is incorporated into the periactive zone upon SV fusion, where it triggers CME, thus coupling exocytosis to CME. Here, we show that Fwe also promotes ADBE. Intriguingly, the effects of Fwe on CME and ADBE depend on the strength of the stimulus. Upon mild stimulation, Fwe controls CME independently of Ca2+ channeling. However, upon strong stimulation, Fwe triggers a Ca2+ influx that initiates ADBE. Moreover, knockout of rodent fwe in cultured rat hippocampal neurons impairs but does not completely abolish CME, similar to the loss of Drosophila fwe at the neuromuscular junction, suggesting that Fwe plays a regulatory role in regulating CME across species. In addition, the function of Fwe in ADBE is conserved at mammalian central synapses. Hence, Fwe exerts different effects in response to different stimulus strengths to control two major modes of endocytosis.

PMID:
28414717
PMCID:
PMC5393565
DOI:
10.1371/journal.pbio.2000931
[Indexed for MEDLINE]
Free PMC Article

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