Early specification of GAD67 subventricular derived olfactory interneurons |
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Authors: | Céline Plachez Adam C Puche |
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Institution: | (1) Department of Anatomy and Neurobiology, School of Medicine, University of Maryland, 20 Penn Street, Baltimore, MD 21201, USA; |
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Abstract: | Olfactory bulb interneurons are continuously generated in the subventricular zone (SVZ) and migrate along the rostral migratory
stream (RMS) into the olfactory bulb (OB) where the majority becomes local GABAergic interneurons. We previously showed that
SVZ-derived progenitor cells expressed glutamic acid decarboxylase 65 kDa (GAD65) very early in the migratory pathway. However,
only approximately half of OB GABAergic interneurons use GAD65, an equal number express the 67 kDa GAD enzyme. To investigate
the differentiation of these GABAergic interneurons we examined their migration in a transgenic mouse expressing green fluorescent
protein (GFP) under the control of the GAD67 promoter. In adult, GFP was expressed by a subpopulation of migratory cells in
the SVZ and along the RMS. Using Doublecortin (DCX) as a marker of migrating neuroblasts and bromodeoxyuridine (BrdU) incorporation,
we show that these GAD67-GFP neurons co-express DCX and incorporate BrdU indicating they are newly born migratory neuroblasts.
This is similar to GAD65 transgene expression, and in contrast to dopaminergic interneuron transgene expression which occurs
only after cells reach the olfactory bulb. Although the GAD65/67 transgenes are expressed early in migration, there is minimal
protein production in the cells prior to reaching the OB. These results suggest that migrating SVZ-derived neuroblasts acquire
GABAergic identity prior to reaching their final location in the olfactory bulb. |
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