Ca_v1.3 calcium channels are full-range linear amplifiers of firing frequencies in lateral DA SN neurons.

ABSTRACT: The low-threshold L-type calcium channel Ca_v1.3 accelerates the pacemaker rate in the heart, but its functional role for the extended dynamic range of neuronal firing is still unresolved. Here, we show that Ca_v1.3 calcium channels act as unexpectedly simple, full-range linear amplifiers of firing rates for lateral dopamine substantia nigra (DA SN) neurons in mice. This means that they boost in vitro or in vivo firing frequencies between 2 and 50 hertz by about 30%. Furthermore, we demonstrate that clinically relevant, low nanomolar concentrations of the L-type channel inhibitor isradipine selectively reduce the in vivo firing activity of these nigrostriatal DA SN neurons at therapeutic plasma concentrations. Thus, our study identifies the pacemaker function of neurona

SUBMITTER: Shin J 

PROVIDER: S-EPMC9177074 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature