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Molecular Pharmacology, Vol 13, 576-578, Copyright © 1977 by the American Society for Pharmacology and Experimental Therapeutics
1 Department of Medicine, University of Melbourne, Austin Hospital, Heidelberg, Victoria 3084, Australia
Previous work has indicated that during chemical carcinogenesis in rat liver there is an increase in the catecholamine responsiveness of adenylate cyclase. To investigate what role the increased beta adrenergic responsiveness of the enzyme might play in neoplastic transformation, the effect of the beta adrenergic blocker propranolol on tumor incidence in rat liver has been investigated during treatment with the carcinogen 3'-methyl-4-dimethylaminoazobenzene. Propranolol, administered in the drinking water during carcinogen treatment, approximately doubled tumor incidence. It is concluded that increased beta adrenergic responsiveness is unlikely to be a process causal to cancer and, moreover, that propranolol somehow facilitates neoplastic transformation in this systern. Whether such an effect of propranolol is due to specific beta blockade or to nonspecific actions remains to be elucidated.
Note:
ACKNOWLEDGMENTS
We wish to express our gratitude to Karl Liebel
for his help with these experiments, and to ICI for a
gift of propranolol.
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