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Xenobiotica
the fate of foreign compounds in biological systems
Volume 18, 1988 - Issue 2
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Original Article

Identification and quantitation in human liver of cytochromes P-450 analogous to rabbit cytochromes P-450 forms 4 and 6

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Pages 207-216 | Received 20 Mar 1987, Published online: 30 Sep 2009
 

Abstract

1. Polyclonal antibodies raised against rabbit liver cytochrome P-450 isozymes form 4 and 6 have been used to probe human liver microsomes for analogous proteins using the Western blot technique.

2. Anti-Form 4 IgG recognized a protein in human liver microsomes from six subjects of identical molecular weight to purified rabbit liver cytochrome P-450 Form 4.

3. The equivalent content of cytochrome P-450 Form 4 in the same microsomes ranged from 1˙1 to 9˙1 pmol per mg protein.

4. Anti-Form 6 IgG recognized a protein in human liver microsomes from the same six subjects of slightly higher molecular weight than purified rabbit cytochrome P-450 Form 6.

5. The equivalent content of cytochrome P-450 Form 6 in the above microsomes ranged from 1˙6 to 3˙8 pmol per mg protein.

6. No significant correlations were observed between equivalent cytochrome P-450 Forms 4 and 6 content and 2-acetylaminofluorene N-hydroxylase, aminopyrine N-demethylase, benzyprene and aniline hydroxylase activities in liver microsomes from the six subjects tested.

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