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1 General aspects (0)   1.1 Epidemiology (4)   1.2 Population genetics (8)   1.3 Pathogenesis (7)   1.4 Quality of life (4)   1.5 Glaucomas as cause of blindness (0)   1.6 Prevention and screening (1) 2 Anatomical structures in glaucoma (0)   2.1 Conjunctiva (1)   2.2 Cornea (3)   2.3 Sclera (1)   2.4 Anterior chamber angle (0)   2.5 Meshwork (8)     2.5.1 Trabecular meshwork (0)     2.5.2 Schlemms canal (0)     2.5.3 Scleral outlet channels (0)   2.6 Aqueous humor dynamics (4)     2.6.1 Production (0)     2.6.2 Outflow (0)       2.6.2.1 Trabecular meshwork (0)       2.6.2.2 Uveoscleral (0)     2.6.3 Compostion (0)   2.7 Episcleral veins and venous pressure (0)   2.8 Iris (3)   2.9 Ciliary body (3)   2.10 Lens (0)   2.11 Vitreous body (0)   2.12 Choroid, peripapillary choroid, peripapillary atrophy (2)   2.13 Retina and retinal nerve fibre layer (14)   2.14 Optic disc (13)   2.15 Optic nerve (1)   2.16 Chiasma and retrochiasmal central nervous system (0)   2.17 Stem cells (0)   2.20 Other (0) 3 Laboratory methods (0)   3.1 Microscopy (2)   3.2 Electron microscopy (0)   3.3 Immunohistochemistry (7)   3.4 Molecular genetics (2)     3.4.1 Linkage studies (0)     3.4.2 Gene studies (0)   3.5 Molecular biology incl. 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with intraocular tumors (2)     9.4.9 Glaucomas associated with elevated episcleral venous pressure (0)       9.4.10 Glaucomas associated with hemorrhage (0)     9.4.11 Glaucomas following intraocular surgery (0)       9.4.11.1 Ciliary block (malignant) glaucoma (0)       9.4.11.2 Glaucomas in aphakia and pseudophakia (0)       9.4.11.3 Epithelial, fibrous, and endothelial proliferation (0)       9.4.11.4 Glaucomas associated with corneal surgery (1)       9.4.11.5 Glaucomas associated with vitreoretinal surgery (0)     9.4.15 Glaucoma in relation to systemic disease (6)     9.4.20 Other (0) 10 Differential diagnosis e.g. anterior and posterior ischemic optic neuropathy (3) 11 Medical treatment (1)   11.1 General management, indication (5)   11.2 Cholinergic drugs (1)   11.3 Adrenergic drugs (0)     11.3.1 Epinephrine (0)     11.3.2 Thymoxamine, dapiprazole (0)     11.3.3 Apraclonidine, brimonidine (12)     11.3.4 Betablocker (12)     11.3.5 Other (0)   11.4 Prostaglandins (32)   11.5 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(2)

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Abstract #6504 Published in IGR 3-2

Comparison of the vasoactive effects of the docosanoid unoprostone and selected prostanoids on isolated perfused retinal arterioles

Yu DY; Su EN; Cringle SJ; Schoch C; Percicot CP; Lambrou GN
Investigative Ophthalmology and Visual Science 2001; 42: 1499-1504

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PURPOSE: To compare the vasoactive properties of the docosanoid unoprostone, its free acid, and different members of the prostanoid family on isolated perfused pig retinal arterioles in order to assess their potential to modulate retinal blood flow. METHODS: Segments of porcine retinal arterioles were dissected, cannulated, and perfused, and their diameter monitored during either intraluminal or extraluminal application of increasing doses (10^-10 to 10^-4 M) of either the docosanoid unoprostone isopropyl and its free acid or of selected prostanoids: prostaglandin (PG) F_2α and thrombozane A₂ analogue (U46619). Studies were performed on arterioles in their uncontracted state, and also during precontraction with endothelin-1 (10^-9 M). The significance of any induced change in vessel diameter was assessed in relation to the initial vessel diameter or, in the case of endothelin-1 administration, to the contracted diameter with endothelin-1 alone. RESULTS: In normal-tone arterioles without endothelin-1 contraction, PGF_2α and U46619 both produced a potent dose-dependent contraction, but neither unoprostone isopropyl nor unoprostone free acid had a significant vasoactive effect. In endothelin-1-contracted arterioles, U46619 produced further contraction, PGF_2α produced a slight vasodilatation, and unoprostone isopropyl and its free acid produced a pronounced dilatation. CONCLUSIONS: Of the agents tested, unoprostone isopropyl and its free acid were the most potent vasodilators of endothelin-1-contracted pig retinal arteries. Members of the prostanoid family demonstrated a different effect on the diameter of isolated retinal arterioles compared with the docosanoids. Therefore, the potential exists for the docosanoid unoprostone to have a beneficial effect on retinal blood flow in addition to any reduction in intraocular pressure.

Dr Dao-Yi Yu, Lions Eye Institute, 2 Verdun Street, Nedlands, Perth, Western Australia 6009

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Classification:

11.4 Prostaglandins (Part of: 11 Medical treatment)

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