CYP4F3B is induced by PGA1 in human liver cells: a regulation of the 20-HETE synthesis.
The regulation of the human liver-specific cytochrome P450 4F3B (CYP4F3B) isoform, a splice variant of the CYP4F3 gene with strong substrate specificity for long chain fatty acids, is yet an unsolved question. This report provides the first evidence that CYP4F3B is uniquely induced by prostaglandin A1 (PGA1) in human hepatocyte-like HepaRG cells and leads to the synthesis of 20-hydroxy-eicosatetraenoic acids (HETEs). Real time PCR, immunoblot analysis with a specific antipeptide antibody, and determination of fatty acid omega-hydroxylase activity demonstrate that PGA1 treatment strongly increases expression of CYP4F3B. This induction drives the production of 20-HETE (19-fold increase). SiRNA-mediated-silencing of CYP4F3 suppresses both 20-HETE synthesis and PGA1 induced 20-HETE production. Taken together, these results provide evidence that CYP4F3B is the key enzyme to produce 20-HETE by omega-hydroxylation of arachidonic acid in liver cells. Since 20-HETE is a potent activator of PPARalpha and an important inflammatory mediator, CYP4F3B may exert important functions in lipid homeostasis and in inflammatory diseases.
Equipe d'Accueil-948, Faculté de Médecine, Université de Bretagne Occidentale, 29238 Brest, France.
Joseph
J
Antoun
Sophie
S
Goulitquer
Yolande
Y
Amet
Yvonne
Y
Dreano
Jean-Pierre
JP
Salaun
Laurent
L
Corcos
Emmanuelle
E
Plée-Gautier
D000818:Animals; D002417:Cattle; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis* / Q000235:genetics; D000072470:Cytochrome P450 Family 4; D004305:Dose-Response Relationship, Drug; D004790:Enzyme Induction / Q000187:drug effects; D017353:Gene Deletion; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D020868:Gene Silencing; D020719:Glucuronides / Q000378:metabolism; D022781:Hepatocytes / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism*; D006801:Humans; D006893:Hydroxyeicosatetraenoic Acids / Q000096:biosynthesis*; D011454:Prostaglandins A / Q000494:pharmacology*; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D013997:Time Factors; D015854:Up-Regulation / Q000187:drug effects
D020719:Glucuronides; D006893:Hydroxyeicosatetraenoic Acids; D011454:Prostaglandins A; D034741:RNA, Small Interfering; C055987:20-hydroxy-5,8,11,14-eicosatetraenoic acid; D003577:Cytochrome P-450 Enzyme System; D000072470:Cytochrome P450 Family 4; C465349:CYP4F3 protein, human; C100573:prostaglandin A1