Open AccessEnhanced drug-metabolizing capacity within liver adjacent to human and rat liver tumors.
Author(s) -
Lester G. Sultatos,
Elliot S. Vesell
Publication year - 1980
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.77.1.600
Subject(s) - cytochrome , microsome , monooxygenase , reductase , cytochrome p450 , medicine , cytochrome c , liver tumor , endocrinology , biology , biochemistry , enzyme , apoptosis , metabolism , hepatocellular carcinoma
Cytochrome P-450 content (nmol/g of liver) differed within regions of rat liver according to proximity to intrahepatically implanted Morris hepatoma 7795 or 5123D. Liver adjacent to tumor had higher microsomal cytochrome P-450 content, decreased DNA content (mg/g of liver), and unaltered cytochrome c reductase activity compared to histologically indistinguishable liver far-removed from the tumor. Liver either adjacent to or far-removed from tumor contained markedly more cytochrome P-450 and higher cytochrome c reductase activity but less DNA than transplanted Morris hepatomas 7795 and 5123D that were grown intrahepatically. Compared to intramuscular implants of these same tumors, intrahepatically implanted Morris hepatomas 7795 and 5123D had increased cytochrome P-450 content. Tumor-containing liver from two human subjects revealed regional changes in cytochrome P-450-mediated monooxygenases similar to those observed in rats. These results suggest that histomorphically nontumorous mammalian liver directly adjacent to intrahepatic tumors exhibits previously unsuspected biochemical alterations.
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