Quantitative Aspects of Risk Assessment in Chemical Carcinogenesis | Symposium held in Rome/Italy, April 3-6, 1979

D. M. Conning (u. a.)

ISBN 10: 3540095845 / ISBN 13: 9783540095842

Published by Springer Vieweg, 1980

About this Item

Quantitative Aspects of Risk Assessment in Chemical Carcinogenesis | Symposium held in Rome/Italy, April 3-6, 1979 | D. M. Conning (u. a.) | Taschenbuch | viii | Englisch | 1980 | Springer Vieweg | EAN 9783540095842 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu.

Seller Inventory # 106366939

Bibliographic Details

• Title: Quantitative Aspects of Risk Assessment in Chemical Carcinogenesis | Symposium held in Rome/Italy, April 3-6, 1979
• Publisher: Springer Vieweg
• Publication Date: 1980
• Language: English
• ISBN 10: 3540095845
• ISBN 13: 9783540095842
• Binding: Taschenbuch
• Condition: Neu
• Dimensions: 244W x 170H x 19D millimeters 244 millimeters width by 170 millimeters height by 19 millimeters depth
• Weight: 601 grams
• Seller catalogs:
  • Bücher

About this title

Synopsis

N-nitroso-compounds form an important class of carcinogenic chemicals which may be of environmental importance (Druckrey et al., 1967; Magee et al., 1976; IARC, 1978). The mechanism by which these carcinogens initiate neoplastic growth is not well understood but there is substantial evidence favoring the hypothesis that the simple dialkylnitrosamines and alkylnitrosamides act by means of their conversion to al- kylating agents. Alkylating species are generated from the nitrosamines by metabolic activation and from the nitrosamides by chemical decomposition at physiological pH. It is widely believed that DNA is the critical alkylation target. Alkylation takes place at at least 12 sites within the DNA molecule (Lawley, 1976; Singer, 1976; Pegg, 1977a). Al- though alkylation at the 7-position of guanine is the most extensive reaction with the DNA bases and provides a reliable measurement of the degree of interaction with the carcinogen (Swann and Magee, 1968, 1971), recent experiments have suggested that alkylation of oxygen atoms may be the critical reaction (Goth and Rajewsky, 1974; Margison and Kleihues, 1975; Nicoll et aI., 1975; Pegg, 1977a). These laboratories have observed a correlation between the production and persistence of 06-alkyl- guanine and the occurrence oftumors in a variety of organs of rodents exposed to N-ni- troso-carcinogens. It has, therefore, been suggested that the ability of tissues to catalyze the removal of 06-alkylguanine from DNA may provide a protective mechanism against carcinogenesis.