Perikaryal routing of newly synthesized proteins in regenerating neurons: quantitative electron microscopic autoradiography.

Abstract:

:Intracellular transport of newly synthesized proteins through organelles in the perikarya of regenerating goldfish retinal ganglion cells was studied using electron microscopic autoradiography. Retinas were removed 14 or 30 days after optic tract cut or sham operation, pulse-labeled in [3H]proline-containing medium for 5 min, and then chase-incubated in medium containing unlabeled proline for various times up to 55 min before fixation. Fourteen days after axotomy, during rapid growth of the regenerating axons, the time course of change of relative grain density (% grains/% area) in the rough endoplasmic reticulum in regenerating cells was almost identical to that in control cells. However, the grain distribution analysis revealed an increased delivery of newly synthesized proteins to the Golgi apparatus, perikaryal plasma membrane and nucleus in regenerating cells. Thirty days after axotomy, during synaptogenesis, Golgi apparatus labeling in the regenerating cells became significantly higher than control, but the increase was delayed compared to the increase seen 14 days after axotomy. Labeling of the plasma membrane and nucleus did not rise above control in 30-day regenerating cells chase-incubated for up to 55 min. Thus the pattern of intracellular transport of newly synthesized proteins varies with the stage stage of axonal regeneration.

journal_name

Brain Res

journal_title

Brain research

authors

Whitnall MH,Grafstein B

doi

10.1016/0006-8993(82)90832-0

subject

Has Abstract

pub_date

1982-05-06 00:00:00

pages

41-56

issue

1

eissn

0006-8993

issn

1872-6240

pii

0006-8993(82)90832-0

journal_volume

239

pub_type

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