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The Journal of Neuroscience, June 1, 1999, 19(11):4407-4420
Floor Plate and Netrin-1 Are Involved in the Migration and Survival of Inferior Olivary Neurons
Evelyne Bloch-Gallego1, Frédéric Ezan1, Marc Tessier-Lavigne2, and Constantino Sotelo1 1 Institut National de la Santé et de la Recherche Médicale U106, Hôpital de la Salpêtrière, 75013 Paris, France, and 2 Howard Hughes Medical Institute, Department of Anatomy, University of California at San Francisco, San Francisco, California 94143
During their circumferential migration, the nuclei of inferior olivary neurons translocate within their axons until they reach the floor plate where they stop, although their axons have already crossed the midline to project to the contralateral cerebellum. Signals released by the floor plate, including netrin-1, have been implicated in promoting axonal growth and chemoattraction during axonal pathfinding in different midline crossing systems. In the present study, we report experiments that strongly suggest that the floor plate could also be involved in the migration of inferior olivary neurons. First, we show that the pattern of expression of netrin receptors DCC (for deleted in colorectal cancer), neogenin (a DCC-related protein), and members of the Unc5 family in wild-type mice is consistent with a possible role of netrins in directing the migration of precerebellar neurons from the rhombic lips. Second, we have studied mice deficient in netrin-1 production. In these mice, the number of inferior olivary neurons is remarkably decreased. Some of them are located ectopically along the migration stream, whereas the others are located medioventrally and form an atrophic inferior olivary complex: most subnuclei are missing. However, axons of the remaining olivary cell bodies located in the vicinity of the floor plate still succeed in entering their target, the cerebellum, but they establish an ipsilateral projection instead of the normal contralateral projection. In vitro experiments involving ablations of the midline show a fusion of the two olivary masses normally located on either side of the ventral midline, suggesting that the floor plate may function as a specific stop signal for inferior olivary neurons. These results establish a requirement for netrin-1 in the migration of inferior olivary neurons and suggest that it may function as a specific guidance cue for the initial steps of the migration from the rhombic lips and then later in the development of the normal crossed projection of the inferior olivary neurons. They also establish a requirement for netrin-1, either directly or indirectly, for the survival of inferior olivary neurons.
Key words: development; neuronal migration; organotypic cultures; in situ hybridization; axonal tracing; carbocyanine; inferior olivary complex; floor plate; netrin-1; Unc-5H receptors; DCC receptor; survival
Copyright © 1999 Society for Neuroscience 0270-6474/99/19114407-14$05.00/0
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