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• W2083051472 abstract "Microtubule-associated protein 1B is a major constituent of the neuronal cytoskeleton during the early stages of development. This protein and its phosphorylated isoform, microtubule-associated protein 1B-P, defined by the monoclonal antibody 1B-P [Boyne L. J. et al. (1995) J. Neurosci. Res. 40, 439-450], are present in growing axons and concentrated in the distal end near the growth cone. In most regions of the central nervous system, microtubule-associated protein 1B and microtubule-associated protein 1B-P are developmentally down-regulated. They remain, however, at relatively high levels in the adult peripheral nervous system, where microtubule-associated protein 1B-P is localized exclusively in axons. The aim of this study was to examine the levels of microtubule-associated protein 1B and its phosphorylated isoform during regenerative growth of peripheral axons. Following transection and re-apposition of the sciatic nerve at midthigh, the levels of total microtubule-associated protein 1B, microtubule-associated protein 1B-P and microtubule-associated protein 1B messenger RNA were analysed in dorsal root ganglion neurons and sciatic nerve axons using western blots and RNase protection assays. After the lesion, there was a small decrease in the levels of microtubule-associated protein 1B and its messenger RNA in dorsal root ganglion neurons. The proximal axonal stump showed a similar decrease in the levels of microtubule-associated protein 1B 30days after lesion and returned to normal 60-90days post-lesion. In the distal stump of the sciatic nerve, the levels of microtubule-associated protein 1B increased dramatically and rapidly between three and 14days, but the protein was localized mainly in activated Schwann cells and myelin-like structures, and not in axons [Ma D. et al. (1999) Brain Res. 823, 141-153]. With the regeneration of axons into the distal stump, an intense expression of microtubule-associated protein 1B was observed in these axons. Microtubule-associated protein 1B-P, however, disappeared from the degenerated distal axonal stump as early as three days post-operation, and was absent in the regenerating axons and in Schwann cells between three and 14days. The levels of microtubule-associated protein 1B-P recovered slowly and did not reach the normal levels even after 90days post-operation. In contrast to the response following transection, the levels of microtubule-associated protein 1B and microtubule-associated protein 1B-P were much less affected after nerve crush. We propose that the relatively high levels of microtubule-associated protein 1B and its messenger RNA in adult dorsal root ganglions support peripheral neuron regeneration. The presence of microtubule-associated protein 1B in the regenerating axons suggests that microtubule-associated protein 1B is involved in axonal growth during peripheral nerve regeneration. However, the phosphorylated microtubule-associated protein 1B-P isoform, associated with growing axons during development, is not present in the regenerating axons after transection, presumably because of changes in the activities of kinases and phosphatases associated with the injury. These observations underscore the difference between axonal development and regeneration and the importance of injury-related effects that occur locally." @default.
• W2083051472 created "2016-06-24" @default.
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• W2083051472 date "2000-07-01" @default.
• W2083051472 modified "2023-10-16" @default.
• W2083051472 title "Regulation of the expression and phosphorylation of microtubule-associated protein 1B during regeneration of adult dorsal root ganglion neurons" @default.
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• W2083051472 doi "https://doi.org/10.1016/s0306-4522(00)00141-x" @default.
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