Initiation of simple and complex spikes in cerebellar Purkinje cells
Date
2010
Authors
Palmer, Lucy
Clark, Beverley A
Grundemann, Jan
Roth, Arnd
Stuart, Gregory J
Hausser, Michael
Journal Title
Journal ISSN
Volume Title
Publisher
Cambridge University Press
Abstract
Cerebellar Purkinje cells produce two distinct forms of action potential output: simple and complex spikes. Simple spikes occur spontaneously or are driven by parallel fibre input, while complex spikes are activated by climbing fibre input. Previous studies indicate that both simple and complex spikes originate in the axon of Purkinje cells, but the precise location where they are initiated is unclear. Here we address where in the axon of cerebellar Purkinje cells simple and complex spikes are generated. Using extracellular recording and voltage-sensitive dye imaging in rat and mouse Purkinje cells, we show that both simple and complex spikes are generated in the proximal axon, ∼15-20 μm from the soma. Once initiated, simple and complex spikes propagate both down the axon and back into the soma. The speed of backpropagation into the soma was significantly faster for complex compared to simple spikes, presumably due to charging of the somatodendritic membrane capacitance during the climbing fibre synaptic conductance. In conclusion, we show using two independent methods that the final integration site of simple and complex spikes is in the proximal axon of cerebellar Purkinje cells, at a location corresponding to the distal end of the axon initial segment.
Description
Keywords
Keywords: dye; action potential; animal cell; article; cerebellum; molecular imaging; mouse; nerve fiber; nerve fiber membrane conductance; nerve fiber membrane potential; nonhuman; priority journal; Purkinje cell; rat; recording; synaptic potential; Action Potenti
Citation
Collections
Source
Journal of Physiology
Type
Journal article
Book Title
Entity type
Access Statement
License Rights
Restricted until
2037-12-31
Downloads
File
Description