Adult-born dentate granule cells show a critical period of dendritic reorganization and are distinct from developmentally born cells
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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.
KeywordsArc Dentate gyrus HFS Morphological model Neurogenesis
This work was supported by the LOEWE-Program “Neuronal Coordination Research Focus Frankfurt” (NeFF), by the German Science Foundation (CRC 1180), by the Federal Ministry of Education and Research (BMBF, to PJ, No. 01GQ1203A), by a Young Investigators Grant (from the faculty of medicine Goethe-University to PJ), and by a BMBF grant (No. 01GQ1406, Bernstein Award 2013) to HC. MB was further supported by the International Max Planck Research School (IMPRS) for Neural Circuits in Frankfurt. We thank Torsten Felske for help with GC reconstruction. We are indebted to Ute Fertig for technical assistance in preparing and staining of hippocampal slices.
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Conflict of interest
The authors declare that they have no conflict of interest.
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