Voltage-Gated Sodium Channels in Cerebellar Purkinje Cells of Mormyrid Fish

2006 ◽  
Vol 96 (1) ◽  
pp. 378-390 ◽  
Author(s):  
Martijn M. de Ruiter ◽  
Chris I. De Zeeuw ◽  
Christian Hansel
Keyword(s):  
Purkinje Cells ◽  
Molecular Layer ◽  
Climbing Fiber ◽  
Excitatory Postsynaptic Potential ◽  
Electrophysiological Response ◽  
Voltage Gated ◽  
Response Characteristics ◽  
Mormyrid Fish ◽  
Cerebellar Purkinje Cells ◽  
Immunohistochemical Techniques

Cerebellar Purkinje cells of mormyrid fish differ in some morphological as well as physiological parameters from their counterparts in mammals. Morphologically, Purkinje cells of mormyrids have larger dendrites that are characterized by a lower degree of branching in the molecular layer. Physiologically, there are differences in electrophysiological response patterns that are related to sodium channel activity: first, sodium spikes in mormyrid Purkinje cells have low amplitudes, typically not exceeding 30 mV. Second, the response to climbing fiber stimulation in mormyrid Purkinje cells does not consist of a complex spike (with an initial fast sodium spike) as in mammals, but instead it consists of an all-or-none excitatory postsynaptic potential, the so-called climbing fiber response. Because of these unique properties, we have begun to characterize mormyrid Purkinje cells electrophysiologically. In this study, we provide a description of voltage-gated Na+ channels and conductances in Purkinje cells of the mormyrid fish Gnathonemus petersii. Various types of Na+ channel α-subunits, i.e., Nav1.1, Nav1.2, and Nav1.6, have been described in rodent Purkinje cells. Using immunohistochemical techniques, we found that these subunits are present in Purkinje cells of mormyrids. To test whether these Na+ channel subunits can mediate fast inactivating and resurgent Na+ currents in Gnathonemus Purkinje cells, we conducted patch-clamp recordings in acutely dissociated cells and in cerebellar slices. Both types of Na+ currents could be measured in rat and fish Purkinje cells. These data show that, despite prominent differences in electrophysiological response characteristics, Purkinje cells of rats and mormyrids share the same voltage-gated Na+ conductances.

scholarly journals Sensory processing and corollary discharge effects in posterior caudal lobe Purkinje cells in a weakly electric mormyrid fish

2014 ◽  
Vol 112 (2) ◽  
pp. 328-339 ◽  
Author(s):  
Karina Alviña ◽  
Nathaniel B. Sawtell
Keyword(s):  
Purkinje Cells ◽  
Mossy Fiber ◽  
Corollary Discharge ◽  
Electrophysiological Response ◽  
Caudal Lobe ◽  
Mormyrid Fish ◽  
Sensory Structures ◽  
Proprioceptive Inputs ◽  
Weakly Electric ◽  
Complete Account

Although it has been suggested that the cerebellum functions to predict the sensory consequences of motor commands, how such predictions are implemented in cerebellar circuitry remains largely unknown. A detailed and relatively complete account of predictive mechanisms has emerged from studies of cerebellum-like sensory structures in fish, suggesting that comparisons of the cerebellum and cerebellum-like structures may be useful. Here we characterize electrophysiological response properties of Purkinje cells in a region of the cerebellum proper of weakly electric mormyrid fish, the posterior caudal lobe (LCp), which receives the same mossy fiber inputs and projects to the same target structures as the electrosensory lobe (ELL), a well-studied cerebellum-like structure. We describe patterns of simple spike and climbing fiber activation in LCp Purkinje cells in response to motor corollary discharge, electrosensory, and proprioceptive inputs and provide evidence for two functionally distinct Purkinje cell subtypes within LCp. Protocols that induce rapid associative plasticity in ELL fail to induce plasticity in LCp, suggesting differences in the adaptive functions of the two structures. Similarities and differences between LCp and ELL are discussed in light of these results.

Normal adult climbing fiber monoinnervation of cerebellar Purkinje cells in mice lacking MHC class I molecules

2008 ◽  
Vol 68 (8) ◽  
pp. 997-1006 ◽  
Author(s):  
Mathieu Letellier ◽  
Melina L. Willson ◽  
Vanessa Gautheron ◽  
Jean Mariani ◽  
Ann M. Lohof
Keyword(s):  
Purkinje Cells ◽  
Mhc Class I ◽  
Climbing Fiber ◽  
Class I ◽  
Normal Adult ◽  
Cerebellar Purkinje Cells ◽  
Mhc Class I Molecules

scholarly journals Mice With Monoallelic GNAO1 Loss Exhibit Reduced Inhibitory Synaptic Input To Cerebellar Purkinje Cells

2021 ◽  
Author(s):  
Huijie Feng ◽  
Yukun Yuan ◽  
Michael R Williams ◽  
Alex Roy ◽  
Jeffrey Leipprandt ◽  
...  
Keyword(s):  
Synaptic Transmission ◽  
Purkinje Cells ◽  
Gabab Receptor ◽  
Molecular Layer ◽  
Loss Of Function ◽  
Whole Cell Patch Clamp ◽  
The Difference ◽  
G Protein Alpha Subunit ◽  
Cerebellar Purkinje Cells

GNAO1 encodes Gαo, a heterotrimeric G protein alpha subunit in the Gi/o family. In this report, we used a Gnao1 mouse model G203R previously described as a gain-of-function Gnao1 mutant with movement abnormalities and enhanced seizure susceptibility. Here, we report an unexpected second mutation resulting in a loss-of-function Gαo protein and describe alterations in central synaptic transmission. Whole cell patch clamp recordings from Purkinje cells (PCs) in acute cerebellar slices from Gnao1 mutant mice showed significantly lower frequencies of spontaneous and miniature inhibitory postsynaptic currents (sIPSCs and mIPSCs) compared to WT mice. There was no significant change in sEPSCs or mEPSCs. Whereas mIPSC frequency was reduced, mIPSC amplitudes were not affected, suggesting a presynaptic mechanism of action. A modest decrease in the number of molecular layer interneurons was insufficient to explain the magnitude of IPSC suppression. Paradoxically, Gi/o inhibitors (pertussis toxin), enhanced the mutant-suppressed mIPSC frequency and eliminated the difference between WT and Gnao1 mice. While GABAB receptor regulates mIPSCs, neither agonists nor antagonists of this receptor altered function in the mutant mouse PCs. This study is the first electrophysiological investigation of the role of Gi/o protein in cerebellar synaptic transmission using an animal model with a loss-of-function Gi/o protein.

scholarly journals Predictive and reactive reward signals conveyed by climbing fiber inputs to cerebellar Purkinje cells

2019 ◽  
Vol 22 (6) ◽  
pp. 950-962 ◽  
Author(s):  
Dimitar Kostadinov ◽  
Maxime Beau ◽  
Marta Blanco-Pozo ◽  
Michael Häusser
Keyword(s):  
Purkinje Cells ◽  
Climbing Fiber ◽  
Cerebellar Purkinje Cells

Ca2+ release from Ca2+ stores, particularly from ryanodine-sensitive Ca2+ stores, is required for the induction of LTD in cultured cerebellar Purkinje cells

1995 ◽  
Vol 74 (5) ◽  
pp. 2184-2188 ◽  
Author(s):  
K. Kohda ◽  
T. Inoue ◽  
K. Mikoshiba
Keyword(s):  
Purkinje Cells ◽  
Specific Inhibitor ◽  
Cell Voltage ◽  
Ruthenium Red ◽  
Mouse Embryos ◽  
Voltage Gated ◽  
Inward Currents ◽  
Cerebellar Purkinje Cells ◽  
Ca2 Channels

1. Primary-cultured cerebellar Purkinje cells (PCs) from mouse embryos were whole cell voltage clamped, and L-glutamate (Glu) was applied iontophoretically to the dendrite. Long-term depression (LTD) of Glu-evoked currents was induced through the conjunction of repeated depolarizations and Glu applications. 2. Thapsigargin, a specific inhibitor of Ca(2+)-ATPase on the endoplasmic reticulum, and ryanodine and ruthenium red, inhibitors of the ryanodine receptor, blocked the induction of LTD. 3. Thapsigargin and ryanodine alone did not affect influx of Ca2+ through voltage-gated Ca2+ channels and inward currents evoked by Glu applications. 4. Our results suggest that Ca2+ release from internal stores, particularly from ryanodine-sensitive stores, is necessary for the induction of LTD in cultured PCs.

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