Coordinate regulation of protein synthesis and messenger RNA content during growth arrest of suspension Chinese hamster ovary cells

Journal of Cellular Physiology
R LevisS Penman

Abstract

We have found Chinese Hamster Ovary cells, cultured in suspension, are subject to growth control by serum. When suspended in medium containing 0.5% serum the cells becomes reversibly arrested in the beginning of the G1 phase of the cell cycle and can be maintained in this viable, nonproliferating state for several days. This system was used to examine the regulation of protein synthesis with growth rate. In particular, the experiments addressed the question whether mRNA content is the principal controlling factor determining the rate of protein synthesis. The rate of leucine incorporation in resting cells in low serum is 2-to 2.5-fold lower than that of cells growing in 10% serum. The steady-state number of cytoplasmic poly A (+) RNA molecules shows a proportional decrease, consistent with it being a determining factor controlling the rate of protein synthesis. Furthermore, the rate of production of poly A (+) and poly A (-) RNA appears to be regulated coordinately. Regulation of the rate of initiation of translation would result in fewer ribosomes bound per active message and/or a lower proportion of total mRNA's being active. Our measurements indicate that the fraction of cytoplasmic poly A (+) mRNA in polyribosomes and the r...Continue Reading

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Citations

Oct 1, 1978·The Journal of Cell Biology·G T Lee, D L Engelhardt
Jul 26, 1977·Biochemistry·R C Herman, S Penman
Jun 1, 1978·Journal of Cellular Physiology·C P Stanners
Jul 1, 1979·Journal of Cellular Physiology·C P StannersJ W Pollard
Jun 1, 1982·Acta Pathologica, Microbiologica, Et Immunologica Scandinavica. Section C, Immunology·S AhoE Kulonen
Apr 5, 1979·Journal of Molecular Biology·G T Lee, D L Engelhardt

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