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Noradrenaline depresses spontaneous complex spikes activity of cerebellar Purkinje cells via α2-adrenergic receptor in vivo in mice

•NE inhibited the spontaneous CS activity in living mice.•NE-induced inhibition of CS activity was abolished by α2-AR antagonist.•Pharmacology activation of α2-AR induced NE-like inhibition of CS activity. Locus coeruleus (LC) noradrenergic neurons afferents release noradrenaline (NA) in the cerebel...

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Published in:Neuroscience letters 2019-06, Vol.703, p.38-44
Main Authors: Sun, Na, Li, Bing-Xue, Hong, Ying-Ji, Bing, Yan-Hua, Qiu, De-Lai, Chu, Chun-Ping
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description •NE inhibited the spontaneous CS activity in living mice.•NE-induced inhibition of CS activity was abolished by α2-AR antagonist.•Pharmacology activation of α2-AR induced NE-like inhibition of CS activity. Locus coeruleus (LC) noradrenergic neurons afferents release noradrenaline (NA) in the cerebellar cortex for modulating cerebellar neuronal circuitry function. Our previous study found that NA inhibited the spontaneous simple spikes activity of cerebellar Purkinje cells (PC) through activation of molecular layer interneurons (MLIs) in vivo in mice. We here examined the effects of NA on spontaneous complex spikes (CSs) activity of cerebellar PC in urethane-anesthetized mice by electrophysiology recording technique and pharmacological methods. Our results showed that cerebellar surface perfusion of NA significantly reduced the number of spikelets and the area under curve (AUC) of the spontaneous CSs. Application of nonselective adrenergic receptor (AR) antagonist, phentolamine, abolished the NA-induced inhibition of CSs. However applying a nonselective β-AR blocker, propranolol, failed to prevent the NA-induced inhibition of CSs activity. The NA-induced inhibition of CSs activity was not blocked by α1-AR antagonist, prazosin, but it was abolished by α2-AR antagonist, yohimibine. Moreover, application of α2-AR agonist, UK14304 induced a depression of CSs activity and mimicked the NA-induced inhibition of CS activity. These results indicate that NA regulates spontaneous CSs activity of cerebellar PCs via activation of α2-AR in vivo in mice. Our present results suggest that noradrenergic neurons of LC may modulate the outputs of cerebellar PCs via inhibition of CSs activity.
doi_str_mv 10.1016/j.neulet.2019.03.008
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The NA-induced inhibition of CSs activity was not blocked by α1-AR antagonist, prazosin, but it was abolished by α2-AR antagonist, yohimibine. Moreover, application of α2-AR agonist, UK14304 induced a depression of CSs activity and mimicked the NA-induced inhibition of CS activity. These results indicate that NA regulates spontaneous CSs activity of cerebellar PCs via activation of α2-AR in vivo in mice. 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subjects Adrenergic receptor
Cerebellar Purkinje cell
In vivo electrophysiological recording
Noradrenaline (NA)
Spontaneous complex spikes
title Noradrenaline depresses spontaneous complex spikes activity of cerebellar Purkinje cells via α2-adrenergic receptor in vivo in mice
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