RT Journal Article
SR Electronic
T1 Ephrin B1 Is Expressed on Neuroepithelial Cells in Correlation with Neocortical Neurogenesis
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 2726
OP 2737
DO 10.1523/JNEUROSCI.21-08-02726.2001
VO 21
IS 8
A1 Ingo Stuckmann
A1 Anja Weigmann
A1 Andrej Shevchenko
A1 Matthias Mann
A1 Wieland B. Huttner
YR 2001
UL http://www.jneurosci.org/content/21/8/2726.abstract
AB To identify molecules involved in neurogenesis, we have raised monoclonal antibodies against embryonic day 12.5 mouse telencephalon. One antibody, monoclonal antibody 25H11, stains predominantly the ventricular zone of the anterior and lateral telencephalon. Purification of the 25H11 antigen, a 47 kDa integral membrane protein, from ≈2500 mouse telencephali reveals its identity with ephrin B1. Ephrin B1 appears at the onset of neocortical neurogenesis, being first expressed in neuron-generating neuroepithelial cells and rapidly thereafter in virtually all neuroepithelial cells. Expression of ephrin B1 persists through the period of neocortical neurogenesis and is downregulated thereafter. Ephrin B1 is present on the ventricular as well as basolateral plasma membrane of neuroepithelial cells and exhibits an ventricular-high to pial-low gradient across the ventricular zone. Expression of ephrin B1 is also detected on radial glial cells, extending all the way to their pial endfeet, and on neurons in the mantle/intermediate zone but not in the cortical plate. Our results suggest that ephrin B1, presumably via ephrin–Eph receptor signaling, has a role in neurogenesis. Given the ventricular-to-pial gradient of ephrin B1 on the neuroepithelial cell surface and its known role in cell migration in other systems mediated by its repulsive properties, we propose that ephrin B1 may be involved in the migration of newborn neurons out from the ventricular zone toward the neocortex.