Secretagogin expression delineates functionally-specialized populations of striatal parvalbumin-containing interneurons.

Abstract:

:Corticostriatal afferents can engage parvalbumin-expressing (PV+) interneurons to rapidly curtail the activity of striatal projection neurons (SPNs), thus shaping striatal output. Schemes of basal ganglia circuit dynamics generally consider striatal PV+ interneurons to be homogenous, despite considerable heterogeneity in both form and function. We demonstrate that the selective co-expression of another calcium-binding protein, secretagogin (Scgn), separates PV+ interneurons in rat and primate striatum into two topographically-, physiologically- and structurally-distinct cell populations. In rats, these two interneuron populations differed in their firing rates, patterns and relationships with cortical oscillations in vivo. Moreover, the axons of identified PV+/Scgn+ interneurons preferentially targeted the somata of SPNs of the so-called 'direct pathway', whereas PV+/Scgn- interneurons preferentially targeted 'indirect pathway' SPNs. These two populations of interneurons could therefore provide a substrate through which either of the striatal output pathways can be rapidly and selectively inhibited to subsequently mediate the expression of behavioral routines.

journal_name

Elife

journal_title

eLife

authors

Garas FN,Shah RS,Kormann E,Doig NM,Vinciati F,Nakamura KC,Dorst MC,Smith Y,Magill PJ,Sharott A

doi

10.7554/eLife.16088

subject

Has Abstract

pub_date

2016-09-26 00:00:00

issn

2050-084X

journal_volume

5

pub_type

杂志文章

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