Abstract:
:In the eyeblink conditioning paradigm, cerebellar Purkinje cells learn to respond to the conditional stimulus with an adaptively timed pause in its spontaneous firing. Evidence suggests that the pause is elicited by glutamate released from parallel fibers and acting on metabotropic receptors (mGluR7) which initiates a delayed-onset suppression of firing. We suggested that G protein activation of hyperpolarizing Kir3 channels (or 'GIRK', G protein-coupled inwardly-rectifying K+ channels) could be part of such a mechanism. Application of the Kir3 antagonist Tertiapin-LQ locally in the superficial layers of the cerebellar cortex in decerebrate ferrets suppressed normal performance of Purkinje cell pause responses to the conditional stimulus. Importantly, there was no detectable effect on spontaneous firing. These findings suggest that intact functioning of Kir3 channels in the cerebellar cortex is required for normal conditioned Purkinje cell responses.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Johansson F,Hesslow Gdoi
10.1038/s41598-020-72581-8subject
Has Abstractpub_date
2020-09-24 00:00:00pages
15654issue
1issn
2045-2322pii
10.1038/s41598-020-72581-8journal_volume
10pub_type
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