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Journal of Neuroscience, Vol 11, 519-533, Copyright © 1991 by Society for Neuroscience
The early commitment of fetal neurons to the limbic cortex
MF Barbe and P Levitt
Department of Anatomy and Neurobiology, Medical College of Pennsylvania, Philadelphia 19129.
The limbic-system-associated membrane protein (LAMP) is expressed early in
cerebral cortical development by migrating and postmigratory neurons in
limbic regions such as the prefrontal and perirhinal cortices (Horton and
Levitt, 1988), but not by nonlimbic neurons such as in the primary sensory
and motor cortices. In the present study, we used LAMP expression to
evaluate the timing and potential cell-lineage and environmental
determinants of the commitment of cerebral cortical neurons to limbic and
nonlimbic phenotypes. The cerebral wall, containing either presumptive
perirhinal or sensorimotor cortex, was removed prior to [embryonic day (E)
12, 14] or just after (E17) the onset of LAMP expression, labeled with fast
blue, and placed into cavities in either perirhinal or sensorimotor regions
of postnatal day (P) 1 hosts. Host animals were allowed to survive until at
least P10, and surviving transplanted cells were counted and evaluated for
LAMP expression. Sensorimotor cortical neurons transplanted at E14 or E17,
in either homotopic or heterotopic locations, did not express LAMP. In
contrast, a high percentage of perirhinal cortical neurons transplanted at
either E14 or E17, whether situated in sensorimotor or perirhinal regions
of the host, expressed the limbic marker protein. Surprisingly, neurons
from E12 donors exhibited patterns of LAMP expression that reflected their
new location in the host rather than their embryonic origin. The data
suggest that there is an early pliant period in which precursor and early
differentiating cells remain uncommitted to a particular cortical regional
phenotype. After this period, one aspect of the molecular phenotype
(determined by LAMP expression) of neurons destined for sensorimotor and
allo- and mesocortical regions has become immutable by environmental
factors in the host.
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