title: Endothelial cell cytochrome P450 1A1 and 1B1: up-regulation by shear stress.
abstract: Third-passage human umbilical vein endothelial cells (HUVECs) or fifth-passage human aortic endothelial cells (HAECs) were subjected to 25 dynes/cm(2) for 24 h in a parallel-plate flow system. Matched control cells were maintained in static conditions. Total RNA was isolated and pooled from six to eight slides per experiment. Changes in gene expression were analyzed by Northern blots and reverse transcriptase-polymerase chain reaction. Fold changes were normalized to glyceraldehyde phosphate dehydrogenase (GAPDH) values. In HUVECs, arterial levels of shear stress increased mRNA expression of Cytochrome P450 1A1 (CYP1A1) 10.8 +/- 2.1-fold, and CYP1B1 23.1 +/- 3.7-fold; whereas connective tissue growth factor (CTGF) expression was unchanged and endothelin-1 (ET-1) mRNA expression was decreased 0.7 +/- 0.05-fold. The authors determined whether these changes were induced by beta-naphthoflavone, a polyaromatic hydrocarbon, and whether they occurred in HAECs. beta-Naphthoflavone up-regulated CYP1A1 18.3 +/- 4.2-fold, and CYP1B1 4.1 +/- 0.3-fold in HUVECs. Shear stress up-regulated CYP1A1 6.3 +/- 0.4-fold and CYP1B1 51.1 +/- 2.1-fold in HAECs. In addition, the authors examined CYP1A1 and CYP1B1 proteins translated from these genes. Experiments identical to those described above were performed and the cells harvested for protein identification by Western blot of CYP1A1 and CYP1B1. Protein levels of CYP1A1 in HUVECs were up-regulated under shear stress, whereas protein levels of CYP1B1 were not.
authors.affiliation: Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30309, USA. suzanne.eskin@bme.gatech.edu
authors.forename: Suzanne G
authors.initials: SG
authors.lastname: Eskin
authors.forename: Nancy A
authors.initials: NA
authors.lastname: Turner
authors.forename: Larry V
authors.initials: LV
authors.lastname: McIntire
mesh_terms: D001189:Aryl Hydrocarbon Hydroxylases; D002478:Cells, Cultured; D055513:Connective Tissue Growth Factor; D017077:Culture Media, Conditioned / Q000494:pharmacology; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics* / Q000378:metabolism; D065633:Cytochrome P-450 CYP1B1; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics* / Q000378:metabolism; D042783:Endothelial Cells / Q000187:drug effects / Q000378:metabolism*; D019332:Endothelin-1 / Q000235:genetics; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D017874:Immediate-Early Proteins / Q000235:genetics; D007231:Infant, Newborn; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics; D012333:RNA, Messenger / Q000187:drug effects / Q000378:metabolism; D012039:Regional Blood Flow / Q000502:physiology*; D013314:Stress, Mechanical; D015854:Up-Regulation / Q000187:drug effects / Q000502:physiology*; D019324:beta-Naphthoflavone / Q000494:pharmacology
chemical_list: C526317:CCN2 protein, human; D017077:Culture Media, Conditioned; D019332:Endothelin-1; D004791:Enzyme Inhibitors; D017874:Immediate-Early Proteins; D036341:Intercellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D055513:Connective Tissue Growth Factor; D019324:beta-Naphthoflavone; D003577:Cytochrome P-450 Enzyme System; D001189:Aryl Hydrocarbon Hydroxylases; C585496:CYP1B1 protein, human; D019363:Cytochrome P-450 CYP1A1; D065633:Cytochrome P-450 CYP1B1