Protein synthesis and axonal transport in goldfish retinal ganglion cells during regeneration accelerated by a conditioning lesion - PubMed (original) (raw)
Protein synthesis and axonal transport in goldfish retinal ganglion cells during regeneration accelerated by a conditioning lesion
I G McQuarrie et al. Brain Res. 1982.
Abstract
Axonal outgrowth in goldfish retinal ganglion cells following a testing lesion of the optic axons is accelerated by a prior conditioning lesion. Changes in protein synthesis and axonal transport were examined during the accelerated regeneration. The conditioning lesion was an optic tract cut made 2 weeks prior to the testing lesion, which consisted of a tract cut at the chiasma, so that nerves subjected to either a conditioning lesion ('conditioned nerves') or a sham operation ('sham-conditioned nerves') could be examined in the same animal. In the retinal ganglion cells of conditioned nerves, the incorporation of [3H]proline into protein began to increase between 1 and 8 days after the testing lesion. The amount of fast-transported labeled protein was elevated to about 8 X normal by 1 day after the testing lesion but had decreased to about 3-5X normal at 8 and 22 days. The 8 and 22 day values were not significantly different from those in sham-conditioned nerves or nerves that had received a testing lesion alone. For slow protein transport, the instantaneous amount transported was 15-16 X normal in the conditioned nerves at 1 and 8 days after the testing lesion, and the velocity of slow transport, which was already elevated above normal by 1 day after the testing lesion, was elevated still further by 8 days--to a value in excess of 1.5 mm/day (compared to 0.2-0.4 mm/day in normal animals). We believe that the enhanced outgrowth resulting from the conditioning lesion is due to a transient increase in the amount of fast transport (possibly responsible for a decreased delay in the initiation of sprouting), and a sustained increase in the amount and velocity of slow transport (which may account for an increased rate of elongation).
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