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Science beyond Barriers

abberior instruments

Neurobiology

2019
Cell reports

Myosin VI drives clathrin-mediated AMPA receptor endocytosis to facilitate cerebellar long-term depression

Authors:

Wagner, W., Lippmann, K., Heisler, F. F., Gromova, K. V., Lombino, F. L., Roesler, M. K., ... & Kneussel, M.

Keywords:

actin cytoskeleton, AMPA receptor, cerebellum, clathrin-mediated endocytosis, dendritic spines, long-term depression, motor protein, myosin, Myo6, Purkinje cell, synaptic plasticity

Abstract:

Myosin VI is an actin-based cytoskeletal motor implicated in various steps of membrane trafficking. Here, we investigated whether this myosin is crucial for synaptic function and plasticity in neurons. We find that myosin VI localizes at cerebellar parallel fiber to Purkinje cell synapses and that the myosin is indispensable for long-term depression of AMPA-receptor-mediated synaptic signal transmission at this synapse. Moreover, direct visualization of GluA2-containing AMPA receptors in Purkinje cells reveals that the myosin drives removal of AMPA receptors from the surface of dendritic spines in an activity-dependent manner. Co-immunoprecipitation and super-resolution microscopy indicate that specifically the interaction of myosin VI with the clathrin adaptor component α-adaptin is important during long-term depression. Together, these data suggest that myosin VI directly promotes clathrin-mediated endocytosis of AMPA receptors in Purkinje cells to mediate cerebellar long-term depression. Our results provide insights into myosin VI function and the molecular mechanisms underlying synaptic plasticity.

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