title: The effect of the insecticide heptachlor on ras proto-oncogene expression in human myeloblastic leukemia (ML-1) cells.
abstract: Expression of the ras proto-oncogene mRNA in human myeloblastic leukemia (ML-1) cells was analyzed as a function of cDNA amplification by polymerase chain reaction (PCR). By using a pair of oligonucleotides that flank exon-2 from opposite strands (5' and 3') of H-ras cDNA for PCR amplification, ML-1 cells were found to express a 112 bp segment of the ras transcript. A rapid decline in the expression of this transcript was seen in cells treated with heptachlor, a chlorinated hydrocarbon insecticide. Expression of the same ras segment was not affected by treatment of ML-1 with the tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA). Furthermore, addition of serum to quiescent, heptachlor-treated cultures of ML-1 cells inhibited the effect of heptachlor and restored the expression of the ras protooncogene mRNA.
authors.affiliation: Department of Medical Pharmacology and Toxicology, School of Medicine, University of California, Davis 95616.
authors.forename: L F
authors.initials: LF
authors.lastname: Chuang
authors.forename: R Y
authors.initials: RY
authors.lastname: Chuang
mesh_terms: D000199:Actins / Q000235:genetics; D001483:Base Sequence; D001769:Blood; D003470:Culture Media; D015870:Gene Expression / Q000187:drug effects*; D011905:Genes, ras; D006533:Heptachlor / Q000494:pharmacology*; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000235:genetics*; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D000090063:Proto-Oncogene Mas; D012333:RNA, Messenger / Q000235:genetics; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D000199:Actins; D003470:Culture Media; C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D012333:RNA, Messenger; D006533:Heptachlor; D013755:Tetradecanoylphorbol Acetate