Summary
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1.
The hypothesis that peripheral, skeletal muscle tissue contains a trophic factor supporting central neurons has recently been investigatedin vitro by supplementing the culture medium of spinal cord neurons with muscle extracts and fractions of extract. We extended these studies asking whether or not a trophic factor is present in peripheral nerves, the connecting link between muscle and central neurons via which factors may be translocated from muscle to neurons by the retrograde transport system.
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2.
Lumbar, 8-day-old chick spinal cords were dissociated into single cells and then cultured in the presence of peripheral nerve extract. Cytosine arabinoside was added to inhibit proliferation of nonneuronal cells.
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In the presence of nerve extract, spinal cord neurons survived for more than a month, extended numerous neurites, and showed activity of choline acetyltransferase. In the absence of extract, neurons attached and survived for a few days but then died subsequently in less than 10 days.
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Neurite outgrowth did not occur in the absence of extract. Withdrawal of extract from the medium of established neuronal cultures caused progressive loss of both cells and neurites. Other tissues also contained neuron supporting activity but less than that found in nerve extract.
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These studies indicate that peripheral nerves contain relatively high levels of spinal cord neuron-directed trophic activity, suggesting translocation of neurotrophic factor from muscle to central target neurons. The neurotrophic factor has long-term (weeks) effects, whereas short-term (days) survival is factor independent.
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Popiela, H., Porter, T., Beach, R.L. et al. Peripheral nerve extract promotes long-term survival and neurite outgrowth in cultured spinal cord neurons. Cell Mol Neurobiol 4, 67–77 (1984). https://doi.org/10.1007/BF00710943
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DOI: https://doi.org/10.1007/BF00710943