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Bovine floor plate explants secrete SCO-spondin.

Cell Tissue Res.2002 May;308(2):177-91. doi:10.1007/s00441-002-0511-5. Epub 2002 Apr 12
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摘要


SCO-spondin is a large-molecular mass glycoprotein, secreted by the subcommissural organ (SCO), which has been implicated in neuronal development during ontogeny of the central nervous system. The expression of SCO-spondin is not restricted to the SCO but it also occurs in the floor plate, a key structure participating in neuronal differentiation and patterning of the neural tube. It has been postulated that SCO-spondin detected in the floor plate is released into the lumen of the neural tube, but this new route of secretion of floor plate cells needs to be further substantiated. For this purpose, we standardized long-term organ culture of bovine floor plate and performed morphological, immunological, biochemical, and gene expression analyses. The study of floor plate explants and their conditioned media allowed us to demonstrate that: (1) organ-cultured floor plate cells are actively secretory for up to 25 days; (2) SCO-spondin gene is actively transcribed and translated by the cultured floor plate cells; (3) SCO-spondin is released into the culture medium via the apical cell pole; and (4) upon release, SCO-spondin does not aggregate in the conditioned medium but remains soluble. Furthermore, in the cultured floor plate cells, SCO-spondin may be secreted through a route bypassing the Golgi apparatus.

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