RT Journal Article
SR Electronic
T1 Layer Acquisition by Cortical GABAergic Interneurons Is Independent of Reelin Signaling
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 6924
OP 6934
DO 10.1523/JNEUROSCI.0245-06.2006
VO 26
IS 26
A1 Pla, Ramón
A1 Borrell, Víctor
A1 Flames, Nuria
A1 Marín, Oscar
YR 2006
UL http://www.jneurosci.org/content/26/26/6924.abstract
AB Functioning of the cerebral cortex requires the coordinated assembly of circuits involving glutamatergic projection neurons and GABAergic interneurons. Despite their segregated origin in different regions of the telencephalon, projection neurons and interneurons born synchronically end up adopting the same cortical layer, suggesting that layer acquisition is highly coordinated for both neuronal types. The radial migration and laminar arrangement of projection neurons depends on Reelin, a secreted glycoprotein expressed near the pial surface during embryogenesis. In contrast, the mechanisms controlling layer acquisition by cortical interneurons remain essentially unknown. Here, we have used an ultrasound-guided transplantation approach to analyze the mechanisms underlying the acquisition of laminar locations by cortical interneurons. We found that layer acquisition by cortical GABAergic interneurons does not directly depend on Reelin signaling. Moreover, interneurons invade their target layers well after synchronically generated projection neurons reach their final destination. These results suggest a model in which cues provided by projection neurons guide cortical interneurons to their appropriate layer, and reveal that, at least for some neuronal types, long-range radial migration does not directly require Reelin.