Cerebral Cortex 1996; 6:540-549
© Oxford University Press 1996
research-article |
Complementary Distribution of Collagen Type IV and the Epidermal Growth Factor Receptor in the Rat Embryonic Telencephalon
1Department of Neuroscience and Cell Biology, Robert Wood Johnson Medical School-UMDNJ Piscataway, New Jersey 08854, 2Department of Anatomy and Neurobiology, Medical College of Pennsylvania Philadelphia, Pennsylvania 19129
Address correspondence to Dr. Kathie Eagleson, Department of Neuroscience and Cell Biology, Robert Wood Johnson Medical School-UMDNJ, 675 Hoes Lane, Piscataway, NJ 08854
We previously identified an interaction between collagen type IV and the EGF receptor that regulates the differentiation of a limbic cortical phenotype in vitro (ferri and Levitt, 1995). In the present study, we map the expression of the EGF receptor and collagen type IV in the embryonic telencephalon of the rat. At embryonic day (E) 11, the earliest age examined, both proteins are coexpressed throughout the ventricular zone in the cerebral wall; this zone remains immunoreactive throughout corticogenesis (E14–E19). The cells comprising the subventricular zone are the most intensely immunoreactive for the EGF receptor, although little collagen type IV is detected in this region. In contrast, postmitotic neurons that leave the proliferative zones are negative for the receptor. Moreover, during the peak of neuronal migration, the intermediate zone lacks collagen type IV immunoreactivity. Neurons that settle in the cortical plate once again exhibit EGF receptor immunoreactivity; this same zone is devoid of collagen type IV. By E19, coexpression of both proteins is evident only in the rostral extension of the subventricular zone, the pathway of migrating cells leading to the olfactory bulb. The temporal and spatial overlap of the EGE receptor and collagen type IV in the cortical progenitor pool in vivo indicates that these molecules may participate in the initial decisions of neuronal differentiation. Their modified distribution during cortical maturation suggests a changing role for both proteins.
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