Nitric Oxide Modulation of Gene Expression
The free radical nitric oxide (·NO) is the major form of the endothelial-derived relaxing factor that is enzymatically synthesized from arginine oxidation by an NADPH-dependent nitric oxide synthase. ·NO causes smooth muscle relaxation by activating soluble guanylate cyclase, and inhibits platelet aggregation and adhesion to endothelium by increasing cGMP41. Because of the vasorelaxant properties of ·NO and its rapid inactivation in the blood by its reaction with hemoglobin, ·NO inhalation has been advocated as a means of selectively reducing pulmonary hypertension and improving ventilation/perfusion mismatching in a variety of clinical situations9,40.
KeywordsNitric Oxide Acute Lung Injury Guanylate Cyclase Pulmonary Vascular Permeability Peroxynitrous Acid
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