Open AccessHuman bronchus-mediated mutagenesis of mammalian cells by carcinogenic polynuclear aromatic hydrocarbons.
Author(s) -
IhChang Hsu,
Gary D. Stoner,
Herman Autrup,
Benjamin F. Trump,
James K. Selkirk,
Curtis C. Harris
Publication year - 1978
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.75.4.2003
Subject(s) - carcinogen , mutation frequency , mutagenesis , pyrene , explant culture , microbiology and biotechnology , dna , hamster , chinese hamster , chemistry , mutation , benzo(a)pyrene , micronucleus test , biochemistry , cell culture , in vitro , biology , toxicity , gene , genetics , organic chemistry
Cultured human bronchial explants activated benzo[alpha]pyrene (BzaP) into electrophilic metabolites that bind to DNA in bronchial epithelial cells. Promutagenic and mutagenic metabolites of BzaP were also released into the culture medium. An increase in mutation frequency for ouabain resistance was found in Chinese hamster V-79 cells when they were cocultivated with bronchial explants in the presence of BzaP. The proximate carcinogenic form of BzaP, the 7,8-diol [(+/-)-r7,t8-dihyroxy-7,8-dihydrobenzo[a]pyrene], was 5-fold more potent as a promutagen than the parent compound. Neither BzaP nor the 7,8-diol increased the mutation frequency in V-79 cells when they were cultured without bronchial explants. The mutation frequency was directly related to the binding levels of BzaP to bronchial DNA and the concentratin of either BzaP or the 7,8-diol in the medium.