Abstract
From 30 min to 1h of step-up conditions there was a redistribution of polysomes between free, cytoskeletal-bound and membrane-bound fractions such that more polysomes were recovered bound to the cytoskeleton and less in the free fraction. After 1h incubation with insulin there was a higher proportion of polysomes in the cytoskeletal fraction with a decrease occurring in the membrane-bound fraction. At 2h little change was observed in the presence of insulin while a large increase occurred in the cytoskeletal-bound fraction and a decrease in membrane-bound polysomes was seen in cells incubated in the absence of insulin. The results indicate that the proportions of polysomes in the three different fractions can be modulated by physiological stimuli, such as media replenishment and insulin.
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