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The Journal of Neuroscience, June 15, 2001, 21(12):4272-4280

A Role of Netrin-1 in the Formation of the Subcortical Structure Striatum: Repulsive Action on the Migration of Late-Born Striatal Neurons

Tadashi Hamasaki, Satoshi Goto, Shigeyuki Nishikawa, and Yukitaka Ushio

Laboratory of Neurobiology, Department of Neurosurgery, Kumamoto University Medical School, Kumamoto 860-8556, Japan

The mammalian striatum arises in the basal telencephalon and contains morphologically homogenous neurons that can be divided into two distinct compartments, patches and the matrix. During development, patch neurons are generated first to form a striatal primordium. After a large influx of later-born matrix neurons into this region, the unique mosaic arrangement of these two neuronal phenotypes is established. The massive migration of matrix neurons continues during the embryonic period, and they eventually comprise 80-85% of the mature striatum. To elucidate the cellular mechanism or mechanisms underlying this critical event in striatal histogenesis, we examined the migration characteristics of striatal subventricular zone (SVZ) cells at embryonic day 18 when neurogenesis peaks for matrix neurons. Using gel cultures, we show that netrin-1, one of the diffusible guidance cues expressed in the striatal ventricular zone (VZ), exerts a repulsive action on migrating SVZ cells. This effect is blocked in the presence of antibodies against Deleted in colorectal cancer (DCC), a putative receptor for netrin-1. The expression patterns of netrin-1 and DCC strongly suggest the involvement of this effect in the outward migration of SVZ cells into the striatal postmitotic region. Our cell tracing study using living brain slices demonstrates that striatal SVZ cells migrate toward and disperse throughout the striatum, in which they differentiate into phenotypes of striatal projection neurons. We suggest that netrin-1 expressed in the striatal VZ serves to guide the large influx of striatal matrix neurons into the striatal primordium and is thereby involved in the initial formation of fundamental striatal structures.

Key words: DCC; gel culture; matrix neuron; netrin-1; neuronal migration; outward migration; repulsion; striatum; SVZ

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Copyright © 2001 Society for Neuroscience  0270-6474/01/21124272-09$05.00/0

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