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HERO ID
782841
Reference Type
Journal Article
Title
Tissue and sex differences in the activation of aromatic hydrocarbon hydroxylases in rats
Author(s)
Benford, DJ; Bridges, JW
Year
1983
Is Peer Reviewed?
Yes
Journal
Biochemical Pharmacology
ISSN:
0006-2952
EISSN:
1873-2968
Volume
32
Issue
2
Page Numbers
309-313
Language
English
PMID
6870959
DOI
10.1016/0006-2952(83)90560-9
Abstract
Betamethasone and alpha-naphthoflavone produced similar activation of biphenyl 2-hydroxylase and benzo[a]pyrene 3-hydroxylase in control male rat liver microsomes. In small intestinal epithelial microsomes, betamethasone had no effect whereas alpha-naphthoflavone caused a pronounced activation of benzo[a]pyrene hydroxylation and a lesser activation of biphenyl 2-hydroxylation. In lung microsomes, betamethasone had no effect on either enzyme activity whereas alpha-naphthoflavone had no effect on biphenyl 2-hydroxylase but inhibited benzo[a]pyrene hydroxylase. In kidney cortex microsomes from male rats both compounds caused inhibition or had no effect whereas in kidney cortex microsomes female rats betamethasone activated whereas alpha-naphthoflavone had no effect. Activation also occurred in isolated viable hepatocytes from male rats. The response of biphenyl 2-hydroxylase was very similar to that found in male rat liver microsomes but benzo[a]pyrene hydroxylase was more sensitive to activation and less sensitive to inhibition than in microsomes. The findings are interpreted as demonstrating the presence of more than one 'latent' aromatic hydrocarbon hydroxylase in rodents.
Tags
IRIS
•
Biphenyl
Considered
Cited References
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