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Expression of O6-methylguanine-DNA methyltransferase in malignant human glioma cell lines.

Publication ,  Journal Article
Ostrowski, LE; von Wronski, MA; Bigner, SH; Rasheed, A; Schold, SC; Brent, TP; Mitra, S; Bigner, DD
Published in: Carcinogenesis
September 1991

When animals are treated with carcinogenic agents that alkylate O6-guanine residues, the incidence of tumors in specific tissues often relates inversely to the level of the DNA repair enzyme O6-methylguanine-DNA methyltransferase (MGMT) present in the tissue. Similarly, the hypersensitivity to anticancer chloroethylnitrosoureas of some human tumor cell lines is believed to result from their deficiency in MGMT. We have undertaken a comprehensive investigation of MGMT expression in a panel of nine characterized human glioma cell lines. Methyltransferase activity determined by incubating protein extracts of these glioma lines with [3H]methylated DNA ranged from undetectable in six lines (the Mer- phenotype) to greater than 0.8 pmol/mg in two lines (U-373 MG and D-392 MG). MGMT protein was undetectable in Western blots of the Mer- cell extracts probed with specific anti-MGMT monoclonal antibodies. Consistent with these results, steady-state levels of MGMT mRNA, determined by Northern blot analysis, were detectable only in the three Mer+ glioma lines (U-373 MG, D-392 MG, D-263 MG). Southern analysis of EcoRI-digested DNA probed with MGMT cDNA revealed no amplification, rearrangement or deletions of the MGMT gene in any of the glioma cell lines. This is the first report that examines MGMT expression at the biochemical, molecular and genetic levels in a particular tumor type. These studies suggest that transcriptional regulation is the basis of the Mer- phenotype in these malignant human glioma cell lines, since no gross structural or quantitative abnormalities of the MGMT gene were seen in the phenotypically Mer- lines.

Duke Scholars

Published In

Carcinogenesis

DOI

ISSN

0143-3334

Publication Date

September 1991

Volume

12

Issue

9

Start / End Page

1739 / 1744

Location

England

Related Subject Headings

  • Tumor Cells, Cultured
  • RNA, Messenger
  • Oncology & Carcinogenesis
  • O(6)-Methylguanine-DNA Methyltransferase
  • Mutagens
  • Methyltransferases
  • Immunohistochemistry
  • Humans
  • Glioma
  • Gene Expression Regulation, Neoplastic
 

Citation

APA
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MLA
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Ostrowski, L. E., von Wronski, M. A., Bigner, S. H., Rasheed, A., Schold, S. C., Brent, T. P., … Bigner, D. D. (1991). Expression of O6-methylguanine-DNA methyltransferase in malignant human glioma cell lines. Carcinogenesis, 12(9), 1739–1744. https://doi.org/10.1093/carcin/12.9.1739
Ostrowski, L. E., M. A. von Wronski, S. H. Bigner, A. Rasheed, S. C. Schold, T. P. Brent, S. Mitra, and D. D. Bigner. “Expression of O6-methylguanine-DNA methyltransferase in malignant human glioma cell lines.Carcinogenesis 12, no. 9 (September 1991): 1739–44. https://doi.org/10.1093/carcin/12.9.1739.
Ostrowski LE, von Wronski MA, Bigner SH, Rasheed A, Schold SC, Brent TP, et al. Expression of O6-methylguanine-DNA methyltransferase in malignant human glioma cell lines. Carcinogenesis. 1991 Sep;12(9):1739–44.
Ostrowski, L. E., et al. “Expression of O6-methylguanine-DNA methyltransferase in malignant human glioma cell lines.Carcinogenesis, vol. 12, no. 9, Sept. 1991, pp. 1739–44. Pubmed, doi:10.1093/carcin/12.9.1739.
Ostrowski LE, von Wronski MA, Bigner SH, Rasheed A, Schold SC, Brent TP, Mitra S, Bigner DD. Expression of O6-methylguanine-DNA methyltransferase in malignant human glioma cell lines. Carcinogenesis. 1991 Sep;12(9):1739–1744.
Journal cover image

Published In

Carcinogenesis

DOI

ISSN

0143-3334

Publication Date

September 1991

Volume

12

Issue

9

Start / End Page

1739 / 1744

Location

England

Related Subject Headings

  • Tumor Cells, Cultured
  • RNA, Messenger
  • Oncology & Carcinogenesis
  • O(6)-Methylguanine-DNA Methyltransferase
  • Mutagens
  • Methyltransferases
  • Immunohistochemistry
  • Humans
  • Glioma
  • Gene Expression Regulation, Neoplastic