EXPERIMENTAL STUDY
An endogenous inhibitor of nitric oxide synthase regulates endothelial adhesiveness for monocytes
Rainer H. Böger, MDa,
Stefanie M. Bode-Böger, MDa,
Philip S. Tsao, PhDa,
Patrick S. Lin, BSa,
Jason R. Chan, BSa and
John P. Cooke, MD, PhDa
a Section of Vascular Medicine, Stanford University School of Medicine, Stanford, California, USA
Manuscript received August 10, 1999;
revised manuscript received June 16, 2000,
accepted August 16, 2000.
Reprint requests and correspondence to: Dr. John P. Cooke, Division of Cardiovascular Medicine, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305-5406 john.cooke{at}stanford.edu
OBJECTIVES
We sought to determine whether asymmetric dimethylarginine (ADMA) inhibits nitric oxide (NO) elaboration in cultured human endothelial cells and whether this is associated with the activation of oxidant-sensitive signaling mediating endothelial adhesiveness for monocytes.
BACKGROUND
Endothelial NO elaboration is impaired in hypercholesterolemia and atherosclerosis, which may be due to elevated concentrations of ADMA, an endogenous inhibitor of NO synthase.
METHODS
Human umbilical vein endothelial cells (ECV 304) and human monocytoid cells (THP-1) were studied in a functional binding assay. Nitric oxide and superoxide anion (O2) were measured by chemiluminescence; ADMA by high pressure liquid chromatography; monocyte chemotactic protein-1 (MCP-1) by ELISA and NF- B by electromobility gel shift assay.
RESULTS
Incubation of endothelial cells with ADMA (0.1 µM to 100 µM) inhibited NO formation, which was reversed by coincubation with L-arginine (1 mM). The biologically inactive stereoisomer symmetric dimethylarginine did not inhibit NO release. Asymmetric dimethylarginine (10 µM) or native low-density lipoprotein cholesterol (100 mg/dL) increased endothelial O2 to the same degree. Asymmetric dimethylarginine also stimulated MCP-1 formation by endothelial cells. This effect was paralleled by activation of the redox-sensitive transcription factor NF- B. Preincubation of endothelial cells with ADMA increased the adhesiveness of endothelial cells for THP-1 cells in a concentration-dependent manner. Asymmetric dimethylarginine-induced monocyte binding was diminished by L-arginine or by a neutralizing anti-MCP-1 antibody.
CONCLUSIONS
We concluded that the endogenous NO synthase inhibitor ADMA is synthesized in human endothelial cells. Asymmetric dimethylarginine increases endothelial oxidative stress and potentiates monocyte binding. Asymmetric dimethylarginine may be an endogenous proatherogenic molecule.
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Abbreviations and Acronyms
| | ADMA | = asymmetric dimethylarginine | | BHT | = butylated hydroxytoluene | | DDAH | = dimethylarginine dimethylaminohydrolase | | ECV 304 | = a line of transformed human umbilical vein endothelial cells | | ELISA | = enzyme-linked immunosorbent assay | | HBSS | = Hanks balanced salt solution | | HPLC | = high-pressure liquid chromatography | | LDL | = low-density lipoprotein | | LNMMA | = L, N-monomethylarginine | | MCP-1 | = monocyte chemotactic protein | | nLDL | = native low-density lipoprotein | | NO | = nitric oxide | | OPA | = o-phthaldialdehyde | | oxLDL | = oxidized low-density lipoprotein | | SDMA | = symmetric dimethylarginine | | THP-1 | = a line of human monocytoid cells |
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