Elevated nitric oxide level in aqueous humor of patients with acute angle-closure glaucoma. 2001

S H Chiou, and C J Chang, and W M Hsu, and C L Kao, and J H Liu, and W L Chen, and D C Tsai, and C C Wu, and C K Chou
Department of Ophthalmology, Veteran General Hospital-Taipei and National Yang-Ming University, Taipei, ROC.

Nitric oxide, a noxious and free-radical gas, plays a key role in vasodilatation, inflammation, immunity, and neurotoxicity. Studies have shown that a recently detected NO synthase inducible isoform, found in astrocytes in the optic nerve heads of glaucoma patients, could stimulate excessive production of NO. The purpose of our study was to elucidate the role of NO production in the pathogenesis of glaucoma. We measured the concentrations of NO in aqueous humor from 11 patients with acute angle-closure glaucoma (AACG) and 14 patients with cataract. All samples were collected from patients who were free of any other systemic disease. Utilizing a chemiluminescence assay, we found that in AACG patients the NO levels in aqueous humor samples (83.2 +/- 6.7 microM) were significantly higher than in cataract patients (27.1 +/- 3.6 microM; p < 0.001). We therefore concluded that excessive NO in AACG patients reflects the degree of ocular impairment demonstrated by concomitant retinal cell and optic nerve cell damage.

UI MeSH Term Description Entries
D008297 Male Males
D009569 Nitric Oxide A free radical gas produced endogenously by a variety of mammalian cells, synthesized from ARGININE by NITRIC OXIDE SYNTHASE. Nitric oxide is one of the ENDOTHELIUM-DEPENDENT RELAXING FACTORS released by the vascular endothelium and mediates VASODILATION. It also inhibits platelet aggregation, induces disaggregation of aggregated platelets, and inhibits platelet adhesion to the vascular endothelium. Nitric oxide activates cytosolic GUANYLATE CYCLASE and thus elevates intracellular levels of CYCLIC GMP. Endogenous Nitrate Vasodilator,Mononitrogen Monoxide,Nitric Oxide, Endothelium-Derived,Nitrogen Monoxide,Endothelium-Derived Nitric Oxide,Monoxide, Mononitrogen,Monoxide, Nitrogen,Nitrate Vasodilator, Endogenous,Nitric Oxide, Endothelium Derived,Oxide, Nitric,Vasodilator, Endogenous Nitrate
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000208 Acute Disease Disease having a short and relatively severe course. Acute Diseases,Disease, Acute,Diseases, Acute
D000368 Aged A person 65 years of age or older. For a person older than 79 years, AGED, 80 AND OVER is available. Elderly
D001082 Aqueous Humor The clear, watery fluid which fills the anterior and posterior chambers of the eye. It has a refractive index lower than the crystalline lens, which it surrounds, and is involved in the metabolism of the cornea and the crystalline lens. (Cline et al., Dictionary of Visual Science, 4th ed, p319) Aqueous Flare,Intraocular Fluid,Aqueous Flares,Aqueous Humors,Flare, Aqueous,Fluid, Intraocular,Fluids, Intraocular,Humor, Aqueous,Humors, Aqueous,Intraocular Fluids
D014822 Vitreous Body The transparent, semigelatinous substance that fills the cavity behind the CRYSTALLINE LENS of the EYE and in front of the RETINA. It is contained in a thin hyaloid membrane and forms about four fifths of the optic globe. Vitreous Humor,Bodies, Vitreous,Body, Vitreous,Humor, Vitreous,Humors, Vitreous,Vitreous Bodies,Vitreous Humors
D015812 Glaucoma, Angle-Closure A form of glaucoma in which the intraocular pressure increases because the angle of the anterior chamber is blocked and the aqueous humor cannot drain from the anterior chamber. Glaucoma, Closed-Angle,Glaucoma, Angle Closure,Glaucoma, Narrow-Angle,Glaucoma, Uncompensated,Glaucoma, Uncompensative,Angle Closure Glaucoma,Angle Closure Glaucomas,Angle-Closure Glaucoma,Angle-Closure Glaucomas,Closed-Angle Glaucoma,Closed-Angle Glaucomas,Glaucoma, Closed Angle,Glaucoma, Narrow Angle,Glaucomas, Angle Closure,Glaucomas, Angle-Closure,Glaucomas, Closed-Angle,Glaucomas, Narrow-Angle,Glaucomas, Uncompensated,Glaucomas, Uncompensative,Narrow-Angle Glaucoma,Narrow-Angle Glaucomas,Uncompensated Glaucoma,Uncompensated Glaucomas,Uncompensative Glaucoma,Uncompensative Glaucomas
D052247 Nitric Oxide Synthase Type II A CALCIUM-independent subtype of nitric oxide synthase that may play a role in immune function. It is an inducible enzyme whose expression is transcriptionally regulated by a variety of CYTOKINES. INOS Enzyme,Inducible NOS Protein,Inducible Nitric Oxide Synthase,NOS-II,Nitric Oxide Synthase II,Nitric Oxide Synthase, Type II,NOS II

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