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Chromium(VI) treatment of normal human lung cells results in guanine-specific DNA polymerase arrest, DNA-DNA cross-links and S-phase blockade of cell cycle.

Publication ,  Journal Article
Xu, J; Bubley, GJ; Detrick, B; Blankenship, LJ; Patierno, SR
Published in: Carcinogenesis
July 1996

Previous studies have shown that in vitro treatment of a synthetic double-stranded DNA template with chromium(III), or chromium(VI) in the presence of ascorbate, resulted in guanine-specific DNA polymerase arrests that correlated strongly with DNA-DNA cross-linking. In vivo chromium(VI) undergoes a more complicated intracellular cascade of reductive metabolism than is achievable in an in vitro model. Moreover, in living cells, DNA is highly packaged in the form of chromatin which may alter the accessibility of DNA to chromium. A repetitive primer-extension assay was employed to determine whether chromium forms polymerase-arresting lesions in vivo. Normal human lung fibroblasts treated with chromium(VI) exhibited adduct levels of 0.13-0.92 mmol Cr/mol DNA-nucleotides in the total genome (0.26-1.84 Cr adducts/Kbp DNA) and DNA interstrand cross-links. Genomic DNA was isolated and alphoid sequences (1-5% of the genome) were used as a substrate for repetitive primer extension using Taq polymerase. The results showed a dose-dependent, guanine-specific, replication termination, even at low doses resulting in greater than 90% survival. The same treatment resulted in dose-dependent suppression of thymidine incorporation into DNA immediately after treatment. Thymidine incorporation increased during the first 6 h after the 2-h exposure, probably related to the repair of the single strand breaks, but then returned to high suppression levels at 24 h. The chromate treatments inhibited cell growth by specific blocking of the progression of cells through S-phase of the cell cycle. The results confirmed our studies in cell-free systems and taken together they strongly indicate that guanine-guanine DNA interstrand cross-links induced by chromate in living cells is the lesion responsible for blocking DNA replication processivity.

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Published In

Carcinogenesis

DOI

ISSN

0143-3334

Publication Date

July 1996

Volume

17

Issue

7

Start / End Page

1511 / 1517

Location

England

Related Subject Headings

  • S Phase
  • Polymerase Chain Reaction
  • Oncology & Carcinogenesis
  • Nucleic Acid Synthesis Inhibitors
  • Molecular Sequence Data
  • Male
  • Lung
  • Kinetics
  • Humans
  • Fibroblasts
 

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Xu, J., Bubley, G. J., Detrick, B., Blankenship, L. J., & Patierno, S. R. (1996). Chromium(VI) treatment of normal human lung cells results in guanine-specific DNA polymerase arrest, DNA-DNA cross-links and S-phase blockade of cell cycle. Carcinogenesis, 17(7), 1511–1517. https://doi.org/10.1093/carcin/17.7.1511
Xu, J., G. J. Bubley, B. Detrick, L. J. Blankenship, and S. R. Patierno. “Chromium(VI) treatment of normal human lung cells results in guanine-specific DNA polymerase arrest, DNA-DNA cross-links and S-phase blockade of cell cycle.Carcinogenesis 17, no. 7 (July 1996): 1511–17. https://doi.org/10.1093/carcin/17.7.1511.
Xu, J., et al. “Chromium(VI) treatment of normal human lung cells results in guanine-specific DNA polymerase arrest, DNA-DNA cross-links and S-phase blockade of cell cycle.Carcinogenesis, vol. 17, no. 7, July 1996, pp. 1511–17. Pubmed, doi:10.1093/carcin/17.7.1511.
Journal cover image

Published In

Carcinogenesis

DOI

ISSN

0143-3334

Publication Date

July 1996

Volume

17

Issue

7

Start / End Page

1511 / 1517

Location

England

Related Subject Headings

  • S Phase
  • Polymerase Chain Reaction
  • Oncology & Carcinogenesis
  • Nucleic Acid Synthesis Inhibitors
  • Molecular Sequence Data
  • Male
  • Lung
  • Kinetics
  • Humans
  • Fibroblasts