Nerve dependent sulphated glycosaminoglycan synthesis in limb regeneration of the newt Pleurodeles waltl
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Abstract
Denervation of the amputated limb of newts stops the regeneration process by decreasing blastema cell proliferation. We investigated the effect of the denervation on each of the two compartments (epidermal cap, mesenchyme) in mid-bud blastemas on the level of sulphated glycosaminoglycans (GAGS). Denervation resulted in an increase of about threefold in the incorporation of [35S] sulphate into mesenchyme GAGs but had no effect on the epidermal cap. The increase of GAG synthesis in the mesenchymal part of the blastema involved both heparan sulphates and chondroitin-dermatan sulphates. Gel filtration showed no change in GAGs size after denervation. These results confirm that the mesenchymal part of the mid-bud blastema is the main target of nerves and, as heparan sulphates are known to store acidic fibroblast growth factor (aFGF), a polypeptide found in the blastema (Boilly et al.. 1991), this suggest that the nerves' effect on glycosaminoglycans turnover could be implicated in the control of bioavailability of this growth factor in the blastema.
Key words
Limb regeneration Denervation Sulphated glycosaminoglycans Heparan sulphates Growth controlPreview
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References
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