title: Adult-born dentate granule cells show a critical period of dendritic reorganization and are distinct from developmentally born cells.
abstract: Adult-born dentate granule cells (abGCs) exhibit a critical developmental phase during function integration. The time window of this phase is debated and whether abGCs become indistinguishable from developmentally born mature granule cells (mGCs) is uncertain. We analyzed complete dendritic reconstructions from abGCs and mGCs using viral labeling. AbGCs from 21-77 days post intrahippocampal injection (dpi) exhibited comparable dendritic arbors, suggesting that structural maturation precedes functional integration. In contrast, significant structural differences were found compared to mGCs: AbGCs had more curved dendrites, more short terminal segments, a different branching pattern, and more proximal terminal branches. Morphological modeling attributed these differences to developmental dendritic pruning and postnatal growth of the dentate gyrus. We further correlated GC morphologies with the responsiveness to unilateral medial perforant path stimulation using the immediate-early gene Arc as a marker of synaptic activation. Only abGCs at 28 and 35 dpi but neither old abGCs nor mGCs responded to stimulation with a remodeling of their dendritic arbor. Summarized, abGCs stay distinct from mGCs and their dendritic arbor can be shaped by afferent activity during a narrow critical time window.
authors: Institute of Clinical Neuroanatomy, Goethe University, 60528, Frankfurt am Main, Germany. beining@fias.uni-frankfurt.de.|Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, Deutschordenstr. 46, 60528, Frankfurt am Main, Germany. beining@fias.uni-frankfurt.de.|Frankfurt Institute for Advanced Studies (FIAS), 60438, Frankfurt am Main, Germany. beining@fias.uni-frankfurt.de.
authors: Marcel
authors: 0000-0002-6577-2648
authors: M
authors: Beining
authors: Institute of Clinical Neuroanatomy, Goethe University, 60528, Frankfurt am Main, Germany.
authors: Tassilo
authors: T
authors: Jungenitz
authors: Institute of Clinical Neuroanatomy, Goethe University, 60528, Frankfurt am Main, Germany.
authors: Tijana
authors: T
authors: Radic
authors: Institute of Clinical Neuroanatomy, Goethe University, 60528, Frankfurt am Main, Germany.
authors: Thomas
authors: T
authors: Deller
authors: Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, Deutschordenstr. 46, 60528, Frankfurt am Main, Germany.|Frankfurt Institute for Advanced Studies (FIAS), 60438, Frankfurt am Main, Germany.
authors: Hermann
authors: H
authors: Cuntz
authors: Institute of Clinical Neuroanatomy, Goethe University, 60528, Frankfurt am Main, Germany.
authors: Peter
authors: P
authors: Jedlicka
authors: Institute of Clinical Neuroanatomy, Goethe University, 60528, Frankfurt am Main, Germany.
authors: Stephan Wolfgang
authors: SW
authors: Schwarzacher
mesh_terms: D000818:Animals; D001973:Bromodeoxyuridine / Q000378:metabolism; D002454:Cell Differentiation; D003598:Cytoskeletal Proteins / Q000378:metabolism; D003712:Dendrites / Q000502:physiology*; D018891:Dentate Gyrus / Q000166:cytology*; D005071:Evoked Potentials / Q000235:genetics; D007839:Functional Laterality; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D021621:Imaging, Three-Dimensional; D008297:Male; D008959:Models, Neurological; D009419:Nerve Tissue Proteins / Q000378:metabolism; D055495:Neurogenesis / Q000502:physiology*; D059906:Neuroimaging; D009473:Neuronal Plasticity / Q000502:physiology; D009474:Neurons / Q000145:classification*; D051381:Rats; D017207:Rats, Sprague-Dawley; D016704:Synapsins / Q000378:metabolism; D014161:Transduction, Genetic
chemical_list: D003598:Cytoskeletal Proteins; D009419:Nerve Tissue Proteins; D016704:Synapsins; C092069:activity regulated cytoskeletal-associated protein; D049452:Green Fluorescent Proteins; D001973:Bromodeoxyuridine
keywords: Arc; Dentate gyrus; HFS; Morphological model; Neurogenesis