Adult generation of glutamatergic olfactory bulb interneurons

Nat Neurosci. 2009 Dec;12(12):1524-33. doi: 10.1038/nn.2416. Epub 2009 Nov 1.

Abstract

The adult mouse subependymal zone (SEZ) harbors neural stem cells that are thought to exclusively generate GABAergic interneurons of the olfactory bulb. We examined the adult generation of glutamatergic juxtaglomerular neurons, which had dendritic arborizations that projected into adjacent glomeruli, identifying them as short-axon cells. Fate mapping revealed that these originate from Neurog2- and Tbr2-expressing progenitors located in the dorsal region of the SEZ. Examination of the progenitors of these glutamatergic interneurons allowed us to determine the sequential expression of transcription factors in these cells that are thought to be hallmarks of glutamatergic neurogenesis in the developing cerebral cortex and adult hippocampus. Indeed, the molecular specification of these SEZ progenitors allowed for their recruitment into the cerebral cortex after a lesion was induced. Taken together, our data indicate that SEZ progenitors not only produce a population of adult-born glutamatergic juxtaglomerular neurons, but may also provide a previously unknown source of progenitors for endogenous repair.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult Stem Cells / cytology*
  • Adult Stem Cells / physiology
  • Age Factors
  • Animals
  • Axons / physiology
  • Basic Helix-Loop-Helix Transcription Factors / metabolism
  • Biomarkers / metabolism
  • Brain Diseases / pathology
  • Brain Diseases / physiopathology
  • Cell Lineage / physiology
  • Cerebral Cortex / cytology
  • Cerebral Cortex / physiology
  • Dendrites / physiology
  • Ependyma / cytology
  • Glutamic Acid / physiology*
  • Green Fluorescent Proteins / genetics
  • Hippocampus / cytology
  • Hippocampus / physiology
  • Interneurons / cytology*
  • Interneurons / physiology
  • Interneurons / ultrastructure
  • Mice
  • Mice, Transgenic
  • Nerve Tissue Proteins / metabolism
  • Olfactory Bulb / cytology*
  • Olfactory Bulb / physiology*
  • T-Box Domain Proteins / metabolism
  • gamma-Aminobutyric Acid / physiology

Substances

  • Basic Helix-Loop-Helix Transcription Factors
  • Biomarkers
  • Eomes protein, mouse
  • Nerve Tissue Proteins
  • Neurog2 protein, mouse
  • T-Box Domain Proteins
  • Green Fluorescent Proteins
  • Glutamic Acid
  • gamma-Aminobutyric Acid