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Lack of response to multiple genotoxic agents at the hprt locus in peripheral blood T‐lymphocytes of cynomolgus monkeys
Author(s) -
Zimmer D.M.,
Harbach P.R.,
Mattano S.S.,
Yu R.L.,
Mattes W.B.,
Aaron C.S.
Publication year - 1999
Publication title -
environmental and molecular mutagenesis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1
H-Index - 87
eISSN - 1098-2280
pISSN - 0893-6692
DOI - 10.1002/(sici)1098-2280(1999)33:2<123::aid-em4>3.0.co;2-7
Subject(s) - mutagen , hypoxanthine guanine phosphoribosyltransferase , cyclophosphamide , locus (genetics) , microbiology and biotechnology , genotoxicity , ethyl methanesulfonate , peripheral blood , biology , pharmacology , immunology , mutant , genetics , toxicity , medicine , chemotherapy , dna , gene
We tested the ability of a series of known genotoxic agents to cause mutations at the hprt locus in peripheral blood T‐lymphocytes of cynomolgus monkeys as measured by the ability to form clones in the presence of 6‐thioguanine. Ethylmethane sulfonate (EMS, 300 mg/kg IP), chloroethylmethane sulfonate (Cl‐EMS, 35 or 50 mg/kg IP), and the Pharmacia & Upjohn antitumor agents adozelesin (1.6, 4, 6, or 8 μg/kg IV) and CC‐1065 (6 μg/kg IV) were all negative in the hprt mutation test. Results with cyclophosphamide (CP, 75 mg/kg IV) were equivocal. Adozelesin, CC‐1065, and Cl‐EMS treatments increased the percentage of T‐lymphocytes with chromosome aberrations, as well as inducing types of aberrations not seen in control cells. EMS and CP were not tested for chromosome aberrations. We have previously shown that treatment of monkeys with 77 mg/kg ENU substantially increased the hprt mutant frequency, with a lag time of approximately 77 days between treatment and peak MF values. The results of the present study suggest a low sensitivity of the hprt mutation assay to certain classes of genotoxic agents in cynomolgus monkeys. Environ. Mol. Mutagen. 33:123–131, 1999 © 1999 Wiley‐Liss, Inc.