Abstract:
:Several naphthoquinones, except 2-hydroxy-1,4-naphthoquinone, were found to inhibit microsomal cytochrome P-450-linked monooxygenase activities in rabbit liver and human placenta. In particular, 5-hydroxy-1,4-naphthoquinone inhibited placental estrogen biosynthesis more effectively than it did hepatic drug oxidation reactions. There was little contribution by superoxide radicals to these enzyme inhibitions by naphthoquinones. Spectrophotometric studies revealed that naphthoquinones bind to the cytochrome P-450 component of the monooxygenase complex in both microsomal systems, suggesting that the inhibition is caused by direct interaction of these compounds with the heme.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Muto N,Inouye K,Inada A,Nakanishi T,Tan Ldoi
10.1016/0006-291x(87)90555-9subject
Has Abstractpub_date
1987-07-31 00:00:00pages
487-94issue
2eissn
0006-291Xissn
1090-2104pii
0006-291X(87)90555-9journal_volume
146pub_type
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