(Circulation. 1995;91:139-144.)
© 1995 American Heart Association, Inc.
Tetrahydrobiopterin and Dysfunction of Endothelial Nitric Oxide Synthase in Coronary Arteries
Presented in part at the 66th Scientific Sessions of the American Heart Association, Atlanta, Ga, November 8-11, 1993.
From the Departments of Anesthesiology and Pharmacology, Mayo Clinic, Rochester, Minn.
Correspondence to Zvonimir S. Katu
i
, MD, PhD, Department
of Anesthesiology, Mayo Clinic, 200 First St SW, Rochester, MN 55905.
Background The L-arginine/nitric oxide pathway plays a key role in the regulation of arterial tone. Biosynthesis of nitric oxide requires activation of nitric oxide synthase in the presence of tetrahydrobiopterin as a cofactor. Biochemical studies demonstrated that activation of purified nitric oxide synthase at suboptimal concentrations of tetrahydrobiopterin leads to production of hydrogen peroxide. The present experiments were designed to determine whether in coronary arteries inhibition of tetrahydrobiopterin synthesis may favor nitric oxide synthase–catalyzed production of hydrogen peroxide.
Methods and Results Primary branches of canine left anterior descending artery were incubated for 6 hours in minimum essential medium in the presence or in the absence of the tetrahydrobiopterin synthesis inhibitor 2,4-diamino-6-hydroxypyrimidine (DAHP; 10-2 mol/L). Arterial rings were suspended for isometric tension recording. Production of cGMP was measured by radioimmunoassay. Experiments were performed in the presence of indomethacin (10-5 mol/L). During contractions to the thromboxane A2/prostaglandin H2 receptor agonist U46619 (10-7 mol/L), calcium ionophore A23187 (10-9 to 10-6 mol/L) caused endothelium-dependent relaxations. A nitric oxide synthase inhibitor, NG-nitro-L-arginine methyl ester (3x10-4 mol/L), significantly inhibited these relaxations. In DAHP-treated arteries, relaxations to A23187 and its stimulating effect on cGMP production were significantly reduced in the presence of catalase (1200 U/mL). By contrast, catalase did not exert any effect in rings incubated in the absence of DAHP. Furthermore, the inhibitory effect of catalase on A23187-induced relaxations was abolished when coronary arteries were incubated in the presence of DAHP plus a liposoluble analogue of tetrahydrobiopterin, 6-methyltetrahydropterin (10-4 mol/L).
Conclusions The present study suggests that hydrogen peroxide may be a mediator of endothelium-dependent relaxations in coronary arteries depleted of tetrahydrobiopterin. This initially compensatory response, triggered by a dysfunctional nitric oxide synthase, may represent an important mechanism underlying oxidative vascular injury.
Key Words: endothelium-derived factors • arteries • endothelium
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D. J. Higman, A. M.J. Strachan, L. Buttery, R. C.J. Hicks, D. R. Springall, R. M. Greenhalgh, and J. T. Powell Smoking Impairs the Activity of Endothelial Nitric Oxide Synthase in Saphenous Vein Arterioscler Thromb Vasc Biol, April 1, 1996; 16(4): 546 - 552. [Abstract] [Full Text]
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C. E. Garcia, C. M. Kilcoyne, C. Cardillo, R. O. Cannon III, A. A. Quyyumi, and J. A. Panza Effect of Copper-Zinc Superoxide Dismutase on Endothelium-Dependent Vasodilation in Patients With Essential Hypertension Hypertension, December 1, 1995; 26(6): 863 - 868. [Abstract] [Full Text]
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R. A. Cohen and P. M. Vanhoutte Endothelium-Dependent Hyperpolarization : Beyond Nitric Oxide and Cyclic GMP Circulation, December 1, 1995; 92(11): 3337 - 3349. [Full Text]
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K. A. Pritchard Jr, L. Groszek, D. M. Smalley, W. C. Sessa, M. Wu, P. Villalon, M. S. Wolin, and M. B. Stemerman Native Low-Density Lipoprotein Increases Endothelial Cell Nitric Oxide Synthase Generation of Superoxide Anion Circ. Res., September 1, 1995; 77(3): 510 - 518. [Abstract] [Full Text]
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T. Scott-Burden Regulation of Nitric Oxide Production by Tetrahydrobiopterin Circulation, January 1, 1995; 91(1): 248 - 250. [Full Text]
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W. Wang, S. Wang, L. Yan, P. Madara, A. Del Pilar Cintron, R. A. Wesley, and R. L. Danner Superoxide Production and Reactive Oxygen Species Signaling by Endothelial Nitric-oxide Synthase J. Biol. Chem., May 26, 2000; 275(22): 16899 - 16903. [Abstract] [Full Text] [PDF]
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