Effect of medium hypertonicity on reovirus translation rates. An application of kinetic modeling in vivo

• Published in: Biochemistry (Easton) Vol. 24; no. 26; pp. 7525 - 7532
• Main Authors: Ray, Alpana, Walden, William E, Brendler, Therese, Zenger, Vincent E, Thach, Robert E
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 17.12.1985
• Subjects: Animals; Biological and medical sciences; Cells, Cultured; Culture Media; Cycloheximide - pharmacology; Fundamental and applied biological sciences. Psychology; Kinetics; Mice; Microbiology; Models, Biological; Osmolar Concentration; Protein Biosynthesis - drug effects; Reoviridae - genetics; Reoviridae - metabolism; Replicative cycle, interference, host-virus relations, pathogenicity, miscellaneous strains; RNA, Messenger - genetics; RNA, Messenger - metabolism; Viral Proteins - biosynthesis; Virology; Virus; Culture medium; Cell culture; Translation; Hypertonic solution; Reoviridae; Reovirus
• ISSN: 0006-2960; 1520-4995
• DOI: 10.1021/bi00347a004

Translation rates were determined for host and virus mRNAs in reovirus-infected SC-1 cells in hypertonic medium. The effect of low doses of cycloheximide on these translation rates was also measured. The results show that hypertonicity selectively stimulates viral translation relative to host translation. Moreover, in hypertonic medium, host translation is slightly stimulated by low doses of cycloheximide, whereas viral translation is markedly inhibited. This effect of cycloheximide is precisely the opposite to what was previously observed in isotonic media [Walden, W. E., Godefroy-Colburn, T., & Thach, R. E. (1981) J. Biol. Chem. 256, 11739-11746]. It is shown that both these effects of hypertonicity are predicted by the message competition/discrimination model previously described and thus provide support for the applicability of certain aspects of the model to translation rates in vivo.