Helmholtz Gemeinschaft

Search
Browse
Statistics
Feeds

Cytochrome P450 2C9-induced endothelial cell proliferation involves induction of mitogen-activated protein (MAP) kinase phosphatase-1, inhibition of the c-Jun N-terminal kinase, and up-regulation of cyclin D1

Item Type:Article
Title:Cytochrome P450 2C9-induced endothelial cell proliferation involves induction of mitogen-activated protein (MAP) kinase phosphatase-1, inhibition of the c-Jun N-terminal kinase, and up-regulation of cyclin D1
Creators Name:Potente, M. and Michaelis, U.R. and Fisslthaler, B. and Busse, R. and Fleming, I.
Abstract:Cytochrome P450 (CYP)-derived epoxyeicosatrienoic acids (EETs) are important modulators of endothelial cell homeostasis. We investigated the signaling pathway linking the activation of CYP 2C9 to enhanced endothelial cell proliferation. Overexpression of CYP 2C9 in cultured human endothelial cells markedly increased proliferation. This effect was paralleled by an up-regulation of the G(1) phase regulatory protein, cyclin D1. The specific CYP 2C9 inhibitor, sulfaphenazole, prevented both the enhanced cell proliferation and up-regulation of cyclin D1. CYP 2C9 overexpression also decreased the activity of the c-Jun N-terminal kinase (JNK). Coexpression of wild type JNK with CYP 2C9 attenuated the CYP 2C9-induced increase in cyclin D1 expression and abolished the CYP 2C9-induced proliferation response. In contrast, cotransfecting dominant negative JNK with CYP 2C9 restored the CYP 2C9-mediated up-regulation of cyclin D1 and proliferation. The inactivation of JNK is linked to its dephosphorylation by dual specificity mitogen-activated protein (MAP) kinase phosphatases (MKPs). Overexpression of CYP 2C9 significantly increased the expression of MKP-1, as did incubation with 11,12-EET. These data demonstrate that the mitogenic effect of CYP 2C9 is due to the generation of EETs, which promote the MKP-1-mediated dephosphorylation and inactivation of JNK, effects ultimately culminating in the expression of cyclin D1 and endothelial cell proliferation.
Keywords:8,11,14-Eicosatrienoic Acid, Aryl Hydrocarbon Hydroxylases, Cell Cycle Proteins, Cell Division, Cultured Cells, Cyclin D1, Cytochrome P-450 Enzyme System, Dual Specificity Phosphatase 1, Enzyme Induction, Gene Expression Regulation, Hydrogen Peroxide, Immediate-Early Proteins, JNK Mitogen-Activated Protein Kinases, Kinetics, Mitogen-Activated Protein Kinases, p38 Mitogen-Activated Protein Kinases, Phosphoprotein Phosphatases, Protein Phosphatase 1, Protein Tyrosine Phosphatases, Serum-Free Culture Media, Steroid 16-alpha-Hydroxylase, Steroid Hydroxylases, Sulfaphenazole, Time Factors, Transfection, Umbilical Veins, Vascular Endothelium
Source:Journal of Biological Chemistry
ISSN:0021-9258
Publisher:American Society for Biochemistry and Molecular Biology
Volume:277
Number:18
Page Range:15671-15676
Date:3 May 2002
Official Publication:https://doi.org/10.1074/jbc.M110806200
PubMed:View item in PubMed

Repository Staff Only: item control page

Open Access
MDC Library