DNA adducts, mutant frequencies, and mutation spectra in various organs of λlacZ mice exposed to ethylating agents

To investigate tissue-specific relations between DNA adducts and mutagenesis in vivo, λlacZ transgenic mice were treated i.p. with N-ethyl-N-nitrosourea (ENU), diethylnitrosamine (DEN), and ethyl methanesulphonate (EMS). In liver, bone marrow, and brain DNA from mice sacrificed at several time points after treatment O6-ethylguanine (O6-EtG) and...

Respiratory tract tumours in hamsters exposed to acetaldehyde vapour alone or simultaneously to benzo(a)pyrene or diethylnitrosamine

Syrian golden hamsters were exposed to 0 or 2500-1650 ppm acetaldehyde vapour, 7 hr/day, 5 days/week for a period of 52 weeks. A proportion of the animals was given, simultaneously, either intratracheal instillations of benzo(a)pyrene (BP) or subcutaneous injections of diethylnitrosamine (DENA). All treatments were stopped after 52 weeks. The...

Report of a workshop on bacterial in vitro mutagenicity test systems

Bacterial systems for the screening of chemical substances for mutagenic potential are receiving widespread attention. Now that many laboratories have introduced these test systems and a large number of substances has been tested, discrepancies in the results have become apparent. To discuss this problem, a workshop was organized at Neuherberg ...