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2016 ; 8
(ä): 24
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English Wikipedia
Flash-and-Freeze: Coordinating Optogenetic Stimulation with Rapid Freezing to
Visualize Membrane Dynamics at Synapses with Millisecond Resolution
#MMPMID27594835
Watanabe S
Front Synaptic Neurosci
2016[]; 8
(ä): 24
PMID27594835
show ga
Electron microscopy depicts subcellular structures at synapses exquisitely but
only captures static images. To visualize membrane dynamics, we have developed a
novel technique, called flash-and-freeze, which induces neuronal activity with a
flash of light and captures the membrane dynamics by rapid freezing. For
characterizing membrane movements during synaptic transmission, a light-sensitive
cation channel, channelrhodopsin, is heterologously expressed in mouse
hippocampal neurons or in Caenorhabditis elegans motor neurons. A brief pulse of
blue light activates channelrhodopsin and induces an action potential, leading to
synaptic transmission. Following the light stimulation, neurons are frozen at
different time intervals ranging from 10 ms to 20 s. Electron micrographs are
then acquired from each time point to visualize the morphological changes. Using
this approach, we have characterized a novel form of endocytosis, ultrafast
endocytosis, which rapidly removes excess membrane added to the surface during
neurotransmission. The flash-and-freeze approach can be adapted to study other
cellular phenomena that can be induced by light-sensitive genetic or
pharmacological tools.