Nitrate tolerance impairs nitric oxide-mediated vasodilation in vivo

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Nitrate tolerance impairs nitric oxide-mediated vasodilation in vivo.

OBJECTIVES Nitroglycerin (NTG) is metabolized to nitric oxide (NO) in vascular smooth muscle cells. It is currently not clear whether prolonged exposure to NTG and tolerance development directly affects endogenous NO-mediated vasodilation in vivo. This study investigates NO-mediated vasodilation in conscious chronically catheterized rats before and after development of nitrate tolerance. The ef...

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Nitric oxide-mediated vasodilation in human pregnancy.

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Free fatty acid elevation impairs insulin-mediated vasodilation and nitric oxide production.

The effect and time course of free fatty acid (FFA) elevation on insulin-mediated vasodilation (IMV) and the relationship of FFA elevation to changes in insulin-mediated glucose uptake was studied. Two groups of lean insulin-sensitive subjects underwent euglycemic-hyperinsulinemic (40 mU x m(-2) x min(-1)) clamp studies with and without superimposed FFA elevation on 2 occasions approximately 4 ...

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Flow-mediated vasodilation partially reflects nitric oxide-mediated endothelial function.

To the Editor: In this Point:Counterpoint series, Green and Tschakovsky and Pyke address the issue of whether flowmediated dilation (FMD) reflects nitric oxide (NO)-mediated endothelial function (1). However, this question is difficult to answer. It has been conclusively shown that FMD of the brachial artery after 5 min of wrist cuff occlusion can be entirely abolished by the NO synthase (NOS) ...

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Transgenic sickle mice expressing human beta(S)- and beta(S-Antilles)-globins show intravascular sickling, red blood cell adhesion, and attenuated arteriolar constriction in response to oxygen. We hypothesize that these abnormalities and the likely endothelial damage, also reported in sickle cell anemia, alter nitric oxide (NO)-mediated microvascular responses and hemodynamics in this mouse mod...

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ژورنال

عنوان ژورنال: Cardiovascular Research

سال: 1996

ISSN: 0008-6363

DOI: 10.1016/s0008-6363(96)00027-2