ePoster

Logic of the spatial and functional organization of the cortico-striatal projections onto somatostatin and parvalbumin interneurons in the dorsal striatum of mice

Juliette Contadini, Ingrid Bureau, Elodie Fino
FENS Forum 2024(2024)
Messe Wien Exhibition & Congress Center, Vienna, Austria

Conference

FENS Forum 2024

Messe Wien Exhibition & Congress Center, Vienna, Austria

Resources

Authors & Affiliations

Juliette Contadini, Ingrid Bureau, Elodie Fino

Abstract

The basal ganglia (BG) are involved in various functions such as movement regulation and decision-making. As the main input structure, the dorsal striatum constitutes the primary integration hub for sensory and motor, cortical and subcortical information. Exploring BG function requires analyzing how striatal neurons select and integrate sensory information. Studies of corticostriatal connectivity have long been centered on striatal projections neurons (SPNs), representing approximately 95% of the striatal cells and our group has recently showed the discrete nature of their sensory innervations. However, given the tight control of local GABAergic interneurons we, and others, described onto SPNs, it is determinant to uncover the logic of their functional connectivity. Among interneurons, 20% are somatostatin-expressing GABAergic interneurons (SOM+), and 25% express parvalbumin (PV+). Recent research has shown that PV+ cells receive larger inputs from cortex compared to SPNs but whether this results from a higher connectivity or from a greater synaptic strength is still unclear. Moreover, little is known on the patterns of cortical innervations of PV+ and SOM+, in particular the level of convergence of cortical inputs onto single interneurons. To address these questions, we perform anatomical and functional mapping of the cortical projections targeting these two populations of interneurons. We compare sources of inputs by generating brain wide atlases with the modified rabies virus tracing method and evaluate the local patterns and the weight of cortical inputs using laser scanning photostimulation and single cell recordings. Our study thus highlights the specificity of connectivity rules of striatal interneurons.

Unique ID: fens-24/logic-spatial-functional-organization-8e6aa161