Characteristics and a model for fast axoplasmic transport in nerve
β Scribed by Ochs, Sidney
- Publisher
- John Wiley and Sons
- Year
- 1971
- Tongue
- English
- Weight
- 899 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0022-3034
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β¦ Synopsis
Fast axoplasmic transport at a characteristic rate close to 400 mm/day is seen in a variety of different mammalian species. Particulates, proteins, polypeptide, and free amino acids are all carried down the fibers at the same rate. An hypothesis to account for such a heterogeneous transport is based on the sliding filament theory of muscle. In the neuron, a "transport filament" is synthesized in the cell body and to it the various transported species are bound. The transporting filament moves down the nerve by means of cross-bridges. In analogy to muscle where ATP is required to supply the energy required for the cross-bridges, fast axoplasmic transport in the nerve fiber also has been found to depend on oxidative metabolism supplying ATP.
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The rate of the fast transport system in cat sensory nerve fibers shown by the distal displacement of a peak of isotopic activity in sciatic nerves after L7 ganglion injection with 3H-leucine, is 401 + 35 mm/'day. A similar rate of fast transport was also found for motor fibers in a smaller number o
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