Optogenetic Control of Synaptic AMPA Receptor Endocytosis Reveals Roles of LTD in Motor Learning.

Authors:
Wataru Kakegawa
Wataru Kakegawa
School of Medicine
Akira Katoh
Akira Katoh
Seikei University
Japan
Eriko Miura
Eriko Miura
School of Medicine
Japan
Junko Motohashi
Junko Motohashi
Keio University School of Medicine
新宿区 | Japan
Akiyo Takahashi
Akiyo Takahashi
Chiba University Graduate School of Medicine
Japan
Kazuhisa Kohda
Kazuhisa Kohda
School of Medicine
Japan
Yugo Fukazawa
Yugo Fukazawa
National Institute for Physiological Sciences
Japan

Neuron 2018 Sep 16;99(5):985-998.e6. Epub 2018 Aug 16.

Department of Physiology, Keio University School of Medicine, Tokyo 160-8582, Japan; Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan; Japan Science and Technology Agency, PRESTO, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan; Brain Science Inspired Life Support Research Center (BLSC), The University of Electro-Communications, Tokyo 182-8585, Japan. Electronic address:

Long-term depression (LTD) of AMPA-type glutamate receptor (AMPA receptor)-mediated synaptic transmission has been proposed as a cellular substrate for learning and memory. Although activity-induced AMPA receptor endocytosis is believed to underlie LTD, it remains largely unclear whether LTD and AMPA receptor endocytosis at specific synapses are causally linked to learning and memory in vivo. Here we developed a new optogenetic tool, termed PhotonSABER, which enabled the temporal, spatial, and cell-type-specific control of AMPA receptor endocytosis at active synapses, while the basal synaptic properties and other forms of synaptic plasticity were unaffected. We found that fiberoptic illumination to Purkinje cells expressing PhotonSABER in vivo inhibited cerebellar motor learning during adaptation of the horizontal optokinetic response and vestibulo-ocular reflex, as well as synaptic AMPA receptor decrease in the flocculus. Our results demonstrate that LTD and AMPA receptor endocytosis at specific neuronal circuits were directly responsible for motor learning in vivo. VIDEO ABSTRACT.

Abstract Video

PhotonSABER Casts Light on Learning Mechanisms


Source: Cell Press

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http://dx.doi.org/10.1016/j.neuron.2018.07.034DOI Listing

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September 2018
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