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• W3036970868 endingPage "19.2020" @default.
• W3036970868 startingPage "ENEURO.0323" @default.
• W3036970868 abstract "Abstract We analyzed the origin and relevance of the perisomatic excitatory inputs on the parvalbumin interneurons of the granule cell layer in mouse. Confocal analysis of the glutamatergic innervation showed that it represents ∼50% of the perisomatic synapses that parvalbumin cells receive. This excitatory input may originate from granule cell collaterals, the mossy cells, or even supramammillary nucleus. First, we assessed the input from the mossy cells on parvalbumin interneurons. Axon terminals of mossy cells were visualized by their calretinin content. Using multicolor confocal microscopy, we observed that less than 10% of perisomatic excitatory innervation of parvalbumin cells could originate from mossy cells. Correlative light and electron microscopy revealed that innervation from mossy cells, although present, was indeed infrequent, except for those parvalbumin cells whose somata were located in the inner molecular layer. Second, we investigated the potential input from supramammillary nucleus on parvalbumin cell somata using anterograde tracing or immunocytochemistry against vesicular glutamate transporter 2 (VGLUT2) and found only occasional contacts. Third, we intracellularly filled dentate granule cells in acute slice preparations using whole-cell recording and examined whether their axon collaterals target parvalbumin interneurons. We found that typical granule cells do not innervate the perisomatic region of these GABAergic cells. In sharp contrast, semilunar granule cells (SGCs), a scarce granule cell subtype often contacted the parvalbumin cell soma and proximal dendrites. Our data, therefore, show that perisomatic excitatory drive of parvalbumin interneurons in the granular layer of the dentate gyrus is abundant and originates primarily from SGCs." @default.
• W3036970868 created "2020-06-25" @default.
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• W3036970868 date "2020-06-22" @default.
• W3036970868 modified "2023-10-17" @default.
• W3036970868 title "Semilunar Granule Cells Are the Primary Source of the Perisomatic Excitatory Innervation onto Parvalbumin-Expressing Interneurons in the Dentate Gyrus" @default.
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• W3036970868 doi "https://doi.org/10.1523/eneuro.0323-19.2020" @default.
• W3036970868 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7340841" @default.
• W3036970868 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32571963" @default.
• W3036970868 hasPublicationYear "2020" @default.
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