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. 1977 Aug;74(8):3133–3137. doi: 10.1073/pnas.74.8.3133

Coordination of ribosome content and polysome formation during estradiol stimulation of vitellogenin synthesis in immature male chick livers.

R E Bast, S A Garfield, L Gehrke, J Ilan
PMCID: PMC431465  PMID: 269377

Abstract

To elucidate the mechanisms by which protein synthesis is affected by estradiol, we characterized cockerel liver polysomal profiles during hormone induction and withdrawal. We describe a method for isolating intact polysomes which results in preparations that are stable even after storage in solution at 10 degrees for 16 hr. In addition, our procedure eliminates the necessity for starving animals prior to experiments. Recovery of radioactive polysomes indicated that yield is about 90% and that our polysomal preparations appear to represent polysome distribution in vivo. Using this approach we show that estradiol injection stimulates ribosome content 6-fold and that formation of polysomes is coincident with the induction of vitellogenin synthesis. We also demonstrate that the size and number of polysomes increase and decrease in a coordinated fashion with the rate of vitellogenin synthesis. The kinetics of ribosome synthesis and the fact that at least 80% of the newly synthesized ribosomes are directly recruited into polysomes indicate that ribosomes might be limiting the rate of protein synthesis during the stimulatory phase of the hormone cycle.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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