PMID: 1254598Mar 25, 1976

Induction of multiple forms of mouse liver cytochrome P-450. Evidence for genetically controlled de novo protein synthesis in response to treatment with beta-naphthoflavone or phenobarbital

The Journal of Biological Chemistry
D A Haugen, M J Coon

Abstract

The administration of polycyclic aromatic compounds such as beta-naphthoflavone or 3-methylcholanthrene is known to cause the induction of many liver microsomal monoxygenase activities and the appearance of a distinct cytochrome called P-448 in genetically responsive, but not in nonresponsive, inbred mouse strains. However, the administration of 2,3,7,8-tetrachlorodibenzo-p-dioxin induces these activities and cytochrome P-448 formation to the same extent in both responsive and nonresponsive inbred strains. In contrast, phenobarbital or pregnenolone-16 alpha-carbonitrile induces in both responsive and nonresponsive strains a different profile of enzyme activities and the appearance of cytochrome P-450 (rather than cytochrome P-448). In the present studies, electrophoresis of liver microsomal proteins from inbred C57BL/6N and DBA/2N and recombinant inbred AKXL-38 and AKXL-38A mouse strains revealed the presence of four polypeptides whose relative staining intensity could be correlated with the induction state of the microsomes as determined by enzymatic and spectral methods. Of these four bands, Band 4 (55,000 daltons) was increased whenever spectral measurements revealed an increase in the cytochrome P-448 content due to adminis...Continue Reading

Related Concepts

Pregnenolone
Dioxins
Recombination, Genetic
Cytochrome P-450 Oxygenase
Mice, Inbred DBA
Microsomes, Liver
Enzyme Induction
Luminal
Mice, Inbred C57BL
Nitriles

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