Record Display for the EPA National Library Catalog


Main Title Oncogene Alterations in In vitro Transformed Rat Tracheal Epithelial Cells.
Author Mass, M. J. ; Schorschinsky, N. S. ; Lasley, J. A. ; Beeman, D. K. ; Austin., S. J. ;
CORP Author Environmental Health Research and Testing, Inc., Research Triangle Park, NC.;Health Effects Research Lab., Research Triangle Park, NC.
Publisher c1990
Year Published 1990
Report Number EPA-68-02-4456; EPA/600/J-90/083;
Stock Number PB90-245432
Additional Subjects Trachea ; Epithelium ; Toxicology ; In vitro analysis ; Cells(Biology) ; Methylation ; Reprints ; Oncogenes ; Neoplastic cell transformation ; Ras genes ; Genetic transcription ; Gene amplification ; Restriction fragmet length polymorphism ; Northern blotting ; Base sequence ; Codon ; Benzo(a)pyrene ; Benzanthracene/dimethyl ; Transfection ; Southern blotting
Library Call Number Additional Info Location Last
NTIS  PB90-245432 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
Ten derivations of rat tracheal epithelial (RTE) cells, including normal cells, normal primary cultures, 7 tumorigenic cell lines and 1 non-tumorigenic cell line transformed in vitro by treatment with 7,12-dimethylbenz(a)anthracene (DMBA), benzo(a)pyrene and/or 12-O-tetradecanoylphorbol-13-acetate (TPA) were examined for oncogene alterations. The analyses included amplification, restriction length polymorphisms (RFLPs), and changes in the expression of RNA transcripts of Ha-ras, Ki-ras, and c-myc. Two DMBA-derived cell lines displayed RFLPs after Eco RI digestion and probing for Ki-ras. No abnormalities of Ha-ras were seen after digestion with Bam HI, Eco RI, or Hind III. No extra Pst I (Ha-ras codon 12, GGA to CGA) or Xba I (Ha-ras codon 61, CAA to CTA) sites were seen after probing for Ha-ras. In one cell line derived by DMBA-treatment, changes in the c-myc restriction pattern were seen after digestion with Bam HI and Hind III. Analysis of CCGG sequences by Hpa II/Msp I digestion indicated that Ki-ras was highly methylated, Ha-ras exhibited limited methylation, and c-myc CCGG sequences were not methylated. In addition, normal cells removed from tracheas and those in primary cultures displayed Hpa II digestion patterns that were distinguishable from those of transformed cell lines by the presence of an apparent extra methylation site. (Copyright (c) 1990 Elsevier Science Publishers B.V. (Biomedical Division).)