Abstract
Growth of cultured rat hepatoma cells in the presence of 5-bromodeoxyuridine results in a rapid inhibition of the synthesis of adrenal steroid-inducible tyrosine aminotransferase (EC 2.6.1.5) and slower decreases in the concentrations of lactate dehydrogenase (EC 1.1.1.27), alcohol dehydrogenase (EC.1.1.1.1), and glucose-6-phosphate dehydrogenase (EC 1.1.1.49). During the same period, neither overall cell growth nor the concentrations of malate dehydrogenase (EC 1.1.1.37), acid phosphatase (EC 3.1.3.2), or alanine aminotransferase (EC 2.6.1.2) were significantly decreased by the base analog. Addition of thymidine to the growth medium rapidly counteracts the inhibition of tyrosine aminotransferase synthesis but restores the normal concentrations of lactate-, alcohol-, and glucose-6-phosphate dehydrogenases much more slowly. Growth of the cells for only one generation in the presence of bromodeoxyuridine, followed by the addition of thymidine, produces transient decreases in the concentrations of the three “late-responding“ dehydrogenases, beginning 2-3 generations after exposure to the analog.
It is concluded that the selective inhibitory effects of the analog could result from a mechanism in which bromodeoxyuridine is uniformly incorporated into cellular DNA, but inhibits the transcription of only certain genes into messenger RNA. A mathematical model is derived to account for the observed differences in the kinetics of the inhibition of synthesis of the gene products that are sensitive to the analog.
Keywords: tyrosine aminotransferase, alanine aminotransferase, dehydrogenases, acid phosphatase, inhibition of synthesis
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- Abbott J., Holtzer H. The loss of phenotypic traits by differentiated cells, V. The effect of 5-bromodeoxyuridine on cloned chondrocytes. Proc Natl Acad Sci U S A. 1968 Apr;59(4):1144–1151. doi: 10.1073/pnas.59.4.1144. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Auricchio F., Martin D., Jr, Tompkins G. Control of degradation and synthesis of induced tyrosine aminotransferase studied in hepatoma cells in culture. Nature. 1969 Nov 22;224(5221):806–808. doi: 10.1038/224806b0. [DOI] [PubMed] [Google Scholar]
- Coleman A. W., Coleman J. R., Kankel D., Werner I. The reversible control of animal cell differentiation by the thymidine analog, 5-bromodeoxyuridine. Exp Cell Res. 1970 Feb;59(2):319–328. doi: 10.1016/0014-4827(70)90606-3. [DOI] [PubMed] [Google Scholar]
- STOCKDALE F., OKAZAKI K., NAMEROFF M., HOLTZER H. 5-BROMODEOXYURIDINE: EFFECT ON MYOGENESIS IN VITRO. Science. 1964 Oct 23;146(3643):533–535. doi: 10.1126/science.146.3643.533. [DOI] [PubMed] [Google Scholar]
- Silagi S., Bruce S. A. Suppression of malignancy and differentiation in melanotic melanoma cells. Proc Natl Acad Sci U S A. 1970 May;66(1):72–78. doi: 10.1073/pnas.66.1.72. [DOI] [PMC free article] [PubMed] [Google Scholar]
- THORNE C. J., GROSSMAN L. I., KAPLAN N. O. Starch-gel electrophoresis of malate dehydrogenase. Biochim Biophys Acta. 1963 Jun 11;73:193–203. doi: 10.1016/0006-3002(63)90303-2. [DOI] [PubMed] [Google Scholar]
- Thompson E. B., Tomkins G. M., Curran J. F. Induction of tyrosine alpha-ketoglutarate transaminase by steroid hormones in a newly established tissue culture cell line. Proc Natl Acad Sci U S A. 1966 Jul;56(1):296–303. doi: 10.1073/pnas.56.1.296. [DOI] [PMC free article] [PubMed] [Google Scholar]