Abstract
The function of the central nervous system largely depends on growth and differentiation (neurite outgrowth) of neural cells and it is well established that growth factors, especially nerve growth factor NGF stimulate neurite outgrowth. However, additional factors are implicated in this process notably the redox state of the cells. For the first time we could demonstrate that the application of recombinant thioredoxin stimulates neurite outgrowth of PC12 cells to the same extend as NGF. Thioredoxin, a small redox protein is a major player in the cellular protein reduction system. An increased expression and secretion of thioredoxin is achieved by the application of the novel sialic acid precursor N-propionylmannosamine (ManNProp). From earlier studies it is known that this N-acylmannosamine analog stimulates significantly the neurite outgrowth in cell cultures. This finding would give new insights into the mechanism of the nerve-stimulatory action of ManNProp and demonstrates the novel role of thioredoxin during the regulation of nerve growth, encouraging further studies.
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