Expression pattern of collagen IX and potential role in the segmentation of the peripheral nervous system

Developmental Biology
C RingW Halfter

Abstract

Segmentation of the peripheral nervous system of vertebrates requires guidance cues located in the adjacent somitic mesoderm. Recent experiments suggest that inhibitory molecules in the posterior somite may influence segmentation by restricting the outgrowth of axons and the migration of neural crest cells to the anterior somite. A potential candidate for an inhibitory molecule is collagen IX, a chondroitin sulfate proteoglycan made by sclerotome cells of the somite and by the notochord. Immunohistochemical localization of collagen IX demonstrated that its expression in the posterior sclerotome of the somite correlates with axon outgrowth and neural crest cell migration through the anterior sclerotome. In vitro, sensory neurites on fibronectin, and motor neurites on basal lamina extract, avoid regions which contain substrate-bound collagen IX. This effect can be abolished by chondroitinase treatment, suggesting that the glycosaminoglycan component of the molecule is responsible for this activity. Further, collagen IX elicits a similar avoidance behavior by neural crest cells in vitro. These data suggest that collagen IX contributes to the segmentation of the peripheral nervous system in vivo.

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