PMID: 3756167Oct 16, 1986Paper

Intranuclear dynamics of DNA polymerase alpha differs between the transplanted R3230AC mammary adenocarcinomas and the host mammary gland depending on lactation cycle

Biochimica Et Biophysica Acta
C M Klinge, D K Liu

Abstract

DNA polymerase alpha activity was markedly higher in all nuclear subfractions, including nuclear matrix, from transplanted R3230AC mammary adenocarcinomas than in the analogous fractions from mammary gland of same tumor-bearing pregnant or lactating rats. Changes in host lactational status had no significant effect on subnuclear distribution of tumor DNA polymerase alpha activity, with the majority (60-75%) localized in soluble nucleoplasm and a significant amount (13-20%) retained in the nuclear matrix. In the host mammary gland, nuclear matrix-bound DNA polymerase alpha was highest, accounting for 48% of total nuclear activity, during late pregnancy when mammary cells undergo rapid raplication. During lactation, when cells in mammary gland cease to divide, only 8% of enzyme activity was in the nuclear matrix, while the majority (60-80%) of DNA polymerase alpha activity was localized in nucleoplasm. In both R3230AC tumor and mammary gland regardless of host's lactational status, the majority (60-80%) of DNA polymerase beta activity was localized in the high salt-soluble chromatin. These present data thus suggest that, regardless of host lactational status, R3230AC tumor has many cycling cells, each with a large pool of DNA pol...Continue Reading

References

Dec 1, 1969·Proceedings of the Society for Experimental Biology and Medicine·A A Simpson, G H Schmidt
Jun 21, 1983·Biochemistry·H C Smith, R Berezney
Dec 21, 1982·Biochemistry·H C Smith, R Berezney
Feb 1, 1980·Cell·D M PardollD S Coffey
Feb 25, 2009·Proceedings of the National Academy of Sciences of the United States of America·Yaomin ChenFrancesca-Fang Liao

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Citations

Jan 1, 1987·The International Journal of Biochemistry·C M Klinge, D K Liu

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