Abstract | PURPOSE: METHODS: IOP was increased and maintained at 80 to 90 mm Hg for 30, 60, or 90 minutes by infusing saline into the anterior chamber of a porcine eye. The fellow eye with normal IOP (10-20 mm Hg) served as control. In some pigs, superoxide dismutase mimetic TEMPOL (1 mM) or vehicle (saline) was injected intravitreally before IOP elevation. After enucleation, retinal arterioles were isolated and pressurized without flow for functional analysis by recording diameter changes using videomicroscopic techniques. Dihydroethidium (DHE) was used to detect superoxide production in isolated retinal arterioles. RESULTS: CONCLUSIONS: Endothelium-dependent NO-mediated dilation of retinal arterioles is impaired by 90 minutes of ischemia induced by elevated IOP. The inhibitory effect appears to be mediated by the alteration of NO signaling via vascular superoxide.
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Authors | Travis W Hein, Yi Ren, Luke B Potts, Zhaoxu Yuan, Enoch Kuo, Robert H Rosa Jr, Lih Kuo |
Journal | Investigative ophthalmology & visual science
(Invest Ophthalmol Vis Sci)
Vol. 53
Issue 1
Pg. 30-6
(Jan 03 2012)
ISSN: 1552-5783 [Electronic] United States |
PMID | 22110081
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Chemical References |
- Cyclic N-Oxides
- Spin Labels
- Superoxides
- Nitroprusside
- Nitric Oxide
- Nitric Oxide Synthase Type III
- Bradykinin
- tempol
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Topics |
- Acute Disease
- Animals
- Arterioles
(metabolism)
- Bradykinin
(pharmacology)
- Cyclic N-Oxides
(administration & dosage)
- Endothelium, Vascular
(metabolism)
- Female
- Intraocular Pressure
- Male
- Nitric Oxide
(metabolism)
- Nitric Oxide Synthase Type III
(metabolism)
- Nitroprusside
(pharmacology)
- Ocular Hypertension
(metabolism)
- Reperfusion Injury
(metabolism)
- Retinal Artery
(metabolism)
- Spin Labels
- Superoxides
(metabolism)
- Swine
- Vasodilation
(physiology)
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