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. 1989 Aug;9(8):3284–3291. doi: 10.1128/mcb.9.8.3284

Depletion of topoisomerase II in isolated nuclei during a glucose-regulated stress response.

J W Shen 1, J R Subjeck 1, R B Lock 1, W E Ross 1
PMCID: PMC362372  PMID: 2552289

Abstract

Conditions, such as anoxia or glucose starvation, which induce the glucose-regulated set of stress proteins also lead to resistance to adriamycin (J. Shen, C. Hughes, C. Chao, J. Cai, C. Bartels, T. Gessner, and J. Subjeck, Proc. Natl. Acad. Sci. USA 84:3278-3282, 1987) and etoposide. We report here that chronic anoxia, glucose starvation, 2-deoxyglucose, the calcium ionophore A23187, glucosamine, ethylene glycol-bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid (EGTA), and tunicamycin (all specific inducers of the glucose regulated system) lead to a rapid and selective depletion of topoisomerase II from isolated nuclei of Chinese hamster ovary cells. This effect precedes a decline in tritiated thymidine incorporation and a redistribution of cells from S into G1/G0. The depletion of the enzyme is not accompanied by a decline in mRNA levels. We have also examined the mutant Chinese hamster K12 cell line which is temperature sensitive for expression of glucose-regulated proteins. When nuclei were isolated from K12 cells incubated at the nonpermissive temperature, a loss of topoisomerase II was again observed in congruence with the expression of stress proteins and cellular resistance to etoposide. These changes were not obtained in parental Wg1A cells incubated at the same temperature. These studies indicate that topoisomerase II is highly sensitive to glucose-regulated stresses and that its depletion from the nucleus, with the associated changes in cell cycle parameters, may represent general characteristics of the glucose-regulated state. Since anoxia and glucose starvation can occur during tumor development, this pathway for expression of drug resistance may have clinical ramifications.

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