Abstract:
:Tocopherols are known to undergo metabolism to phytyl chain-shortened metabolites excreted in urine. We sought to characterize the pathway, including associated enzymes, involved in this biotransformation. We previously found that human hepatoblastoma (HepG2) cultures metabolized tocopherols to their corresponding short-chain carboxychromanols. Putative metabolites of gamma-tocopherol that contained intact chromanol moieties were structurally identified using HepG2 cultures and electron impact gas chromatography-mass spectrometry. A microsomal assay for synthesis of the initial omega-oxidation metabolites was developed and used to screen several recombinant human liver cytochrome P450 isozymes for omega-hydroxylase activity. Seven metabolites of gamma-tocopherol were identified in HepG2 cultures, including 13'-hydroxy-gamma-TOH and all six carboxychromanols predicted by sequential omega-oxidation truncation. Rat and human liver microsomes catalyzed synthesis of 13'-OH- and 13'-COOH-gamma-TOH, but not other metabolites, in the presence of NADPH. Inclusion of NAD favored synthesis of the 13'-COOH metabolite. Recombinant CYP4F2, but not other major human liver CYP isoforms (including CYP3A4 and 3A7), exhibited tocopherol-omega-hydroxylase activity. Liver microsomes and recombinant CYP4F2 both exhibited substrate preference for gamma-TOH over alpha-TOH, and recent studies show that tocotrienols are catabolized more extensively than the corresponding tocopherols. Comparative rates of omega-oxidation of tocochromanols in hepatocytes are inversely related to biopotency and directly related to cytotoxicity of these substances in macrophages. The liver contains a cytochrome P450-mediated pathway that preferentially catabolizes "non-alpha" tocochromanols to excretable metabolites. This metabolic pathway appears central to the optimization of tissue tocochromanol status.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Parker RS,Sontag TJ,Swanson JE,McCormick CCdoi
10.1196/annals.1331.002subject
Has Abstractpub_date
2004-12-01 00:00:00pages
13-21eissn
0077-8923issn
1749-6632pii
1031/1/13journal_volume
1031pub_type
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