Transfer RNA methylase activity and capacity during aflatoxin B1-induced hepatocellular carcinogenesis.

Abstract:

:Transfer RNA methylase (tRNA methylase) activity and capacity were monitored in whole-rat-liver preparations during the induction of hepatocellular carcinomas by an 8-week aflatoxin B1 dosing regimen that produced minimal toxic effects. Significant phases of elevated tRNA methylase capacity occurred at 6 to 9 weeks (20%) and 24 to 29 weeks (40%). No significant change in tRNA methylase activity was noted over the course of the 55-week experiment. Higher aflatoxin B1 doses, producing acute toxic liver damage, resulted in elevated tRNA methylase activity (50%) and capacity (30%) at least as early as 1 week after dosing. Experiments with individual nodular lesions excised from livers of rats continuously fed a diet containing 2 ppm aflatoxin B1 demonstrated similarly elevated tRNA methylase activities and capacities in hyperplastic (preneoplastic)nodules, with and without histological evidence of carcinoma.

journal_name

Cancer Res

journal_title

Cancer research

authors

Busby WF Jr,Paglialunga S,Newberne PM,Wogan GN

subject

Has Abstract

pub_date

1976-06-01 00:00:00

pages

2013-8

issue

6

eissn

0008-5472

issn

1538-7445

journal_volume

36

pub_type

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