ArticleFrontiers in cellular neuroscience2026
Increased dendritic inhibition of dentate gyrus granule cells in a mouse model of Down syndrome.
Article in Frontiers in cellular neuroscience, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Down syndrome is the most common genetic neurodevelopmental disorder associated with mild-to-moderate intellectual disability. A disturbed excitation-inhibition balance is thought to be a major cause for the intellectual deficits in DS. In this study, we used patch-clamp electrophysiology, optogenetic stimulation and immunohistochemistry to investigate synaptic inhibition from specific interneuron subpopulations onto granule cells of the dentate gyrus in Ts65Dn mice. Optogenetically evoked inhibitory postsynaptic currents (IPSCs) from somatostatin (SOM) interneurons onto dendrites of granule cells in the outer molecular layer (ML) did not differ between euploid (Eu) and Ts65Dn mice, indicating normal distal dendritic inhibition in Ts65Dn mice. In addition, optogenetically evoked IPSCs from parvalbumin (PV) interneurons were significantly reduced, indicating reduced functional somatic inhibition in Ts65Dn mice. In contrast, activation of cholecystokinin (CCK) positive interneurons by targeted electrical microstimulation of the inner molecular layer (iML) resulted in IPSCs of increased amplitude (Eu: 372.5 ± 51.97 pA,
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