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Abstract
We demonstrate, using in situ hybridization, that mRNA for the anti-adhesive molecules tenascin R and J1 in the adult rat spinal motoneurons are down-regulated rapidly as a reaction after a ventral funiculus lesion. Tenascin-R was significantly down-regulated at day 1 and normalized after 3 weeks. Tenascin-J1 declined to its lowest value at day 3 and returned to the initial level after 3 weeks. In adjacent sections, the distribution of macrophages was studied with immuno histochemistry. The density of macrophages reached a maximum 3 days after the injury. Thus, the density of macrophages appeared to be inversely related to the level of tenascin mRNA. These data are compatible with the notion that neuronal tenascins may modulate the adhesion of perincurial inflammatory cells.
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