Abstract
The adult mammalian brain maintains a prominent stem cell niche in the subventricular zone supplying new neurons to the olfactory bulb. We examined the dynamics of synaptogenesis by imaging the formation and elimination of clusters of a postsynaptic marker (PSD95), genetically targeted to adult-born neurons. We imaged in vivo adult-born periglomerular neurons (PGNs) during two phases of development, immaturity and maturity. Immature PGNs showed high levels of PSD95 puncta dynamics during 12-72 h intervals. Mature PGNs were more stable compared with immature PGNs but still remained dynamic, suggesting that synaptogenesis persists long after these neurons integrated into the network. By combining intrinsic signal and two photon imaging we followed PSD95 puncta in sensory enriched glomeruli. Sensory input upregulated the development of adult-born PGNs only in enriched glomeruli. Our data provide evidence for an activity-based mechanism that enhances synaptogenesis of adult-born PGNs during their initial phases of development.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adult Stem Cells / cytology*
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Animals
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Brain / cytology*
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Cell Differentiation / genetics
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Cell Differentiation / physiology
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Cell Proliferation
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Dendrites / metabolism
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Dendrites / ultrastructure
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Disks Large Homolog 4 Protein
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Green Fluorescent Proteins / genetics
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Guanylate Kinases
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Intracellular Signaling Peptides and Proteins / genetics
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Intracellular Signaling Peptides and Proteins / metabolism
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Membrane Proteins / genetics
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Membrane Proteins / metabolism
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Mice
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Mice, Inbred BALB C
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Mice, Transgenic
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Microscopy, Confocal / methods
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Microscopy, Electron, Transmission / methods
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Nerve Tissue Proteins / metabolism
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Receptors, Odorant / genetics
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Sensory Receptor Cells / physiology*
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Sensory Receptor Cells / ultrastructure
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Synapses / physiology*
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Synapses / ultrastructure
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Vesicular Glutamate Transport Protein 2 / metabolism
Substances
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Disks Large Homolog 4 Protein
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Dlg4 protein, mouse
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Intracellular Signaling Peptides and Proteins
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Membrane Proteins
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Nerve Tissue Proteins
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Olfr151 protein, mouse
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Receptors, Odorant
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Slc17a6 protein, mouse
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Vesicular Glutamate Transport Protein 2
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Green Fluorescent Proteins
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Guanylate Kinases