Abstract:
PURPOSE:The endothelium produces nitric oxide and endothelin (ET). This study was designed to investigate the endothelium-dependent regulation of the porcine ophthalmic microcirculation. METHODS:Isolated porcine eyes were perfused with a modified Langendorff setup (Hugo Sachs Elektronik KG, Freiburg, Germany) at a perfusion pressure of 80 cm H2O with Krebs-Ringer bicarbonate solution (37 degrees C; 95% O2, 5% CO2). RESULTS:The inhibitor of nitric oxide formation, L-nitroarginine methylester (L-NAME; 10(-6) to 10(-4) M), evoked decreases in flow (maximal decrease, 39% +/- 6%; P < 0.005 versus control). The endothelium-dependent vasodilator bradykinin evoked increases in ophthalmic flow (maximal increase, 26% +/- 2%; P < 0.05 versus control) prevented by L-NAME. The effect of endothelin-1 (ET-1; 10(-12) to 10(-11) M) on flow was biphasic, with early vasodilation (1 to 2 minutes) and late vasoconstriction. At 10(-12) M, the increase in flow was most pronounced (24% +/- 5%; P < 0.05 versus control), whereas 10(-10) M caused only significant decreases in flow (59% +/- 5%; P < 0.001 versus control). Endothelin-3 (ET-3) evoked similar vasodilator effects as ET-1 but less vasoconstriction. The vasodilator effects of ET-3 were prevented by pretreatment of the eye with indomethacin (10(-5) M, to block the production of prostaglandins; P < 0.05 versus control). The endothelinA receptor antagonist FR-139317 significantly reduced vasoconstriction to ET-1 (10(-10) M; P < 0.001 versus control). The thromboxane analogue (U-46619) reduced flow in a concentration-dependent manner (P < 0.001 versus control). CONCLUSIONS:Endothelium-derived nitric oxide released under basal conditions or stimulated by bradykinin significantly regulated flow to the porcine ophthalmic microcirculation. This vasodilator system may play an important protective role against vasospasm. In contrast, ET-1 has vasodilator effects through the release of prostaglandins and potent vasoconstrictor properties mediated through ETA receptors.
journal_name
Invest Ophthalmol Vis Scijournal_title
Investigative ophthalmology & visual scienceauthors
Meyer P,Flammer J,Lüscher TFsubject
Has Abstractpub_date
1993-12-01 00:00:00pages
3614-21issue
13eissn
0146-0404issn
1552-5783journal_volume
34pub_type
杂志文章abstract:PURPOSE:To assess structural, functional, and visual behavioral relationships in mutant rhodopsin transgenic (Tg) rats and to determine whether early optokinetic tracking (OKT) visual experience, known to permanently elevate visual thresholds in normal rats, can enhance vision in rats with photoreceptor degeneration. ...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.12-9569
更新日期:2012-09-14 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1997-02-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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更新日期:2018-06-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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更新日期:2007-03-01 00:00:00
abstract:Purpose:To determine if variation in anterior lamina cribrosa surface depth (ALCSD) differs between glaucoma patients of African (AD) and European descent (ED). Methods:A total of 178 eyes from 123 glaucoma patients in the African Descent and Glaucoma Evaluation Study (ADAGES) and Diagnostic Innovations in Glaucoma St...
journal_title:Investigative ophthalmology & visual science
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更新日期:2019-10-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.61.12.9
更新日期:2020-10-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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更新日期:2003-06-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
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更新日期:2011-08-03 00:00:00
abstract:PURPOSE:The epidermal growth factor receptor (EGFR) appears in astrocytes after neural injury. The authors' laboratory has reported the presence of EGFR in glaucomatous optic nerves. The activation of EGFR is often associated with induction of cyclooxygenase (COX)-2. In this study, the induction of COX-2 pathway in rat...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.04-1473
更新日期:2005-06-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
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更新日期:2011-06-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1979-06-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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doi:10.1167/iovs.11-8241
更新日期:2012-03-26 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.12-10026
更新日期:2012-09-14 00:00:00
abstract::A disruption of the blood-aqueous barrier in rabbit eyes was elicited by use of topical prostaglandin E2(PGE2), infrared irradiation of the iris, or by subcutaneous alpha-melanocyte-stimulating hormone (alpha-MSH). The aqueous flare provoked was measured quantitatively with a photoelectric instrument. The effect of th...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1981-06-01 00:00:00
abstract:PURPOSE:In the rabbit iris sphincter muscle, sodium nitroprusside (SNP), a nitric oxide (NO) donor, inhibits cholinergic contraction but does not affect tachykinergic contraction in vitro. The objectives of the current study were to clarify the mechanism for the different responsiveness to NO in cholinergic and tachyki...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1997-08-01 00:00:00
abstract:PURPOSE:To examine the expression of VEGF in extranodal marginal zone B-cell lymphoma (EMZL) and reactive lymphoid hyperplasia (RLH) of human ocular adnexa, and analyze the correlation with the intratumoral microvessel density (MVD). METHODS:Twenty-two EMZL and 16 RLH tissues were examined in this study. Paraformaldeh...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1978-08-01 00:00:00
abstract::The circulating renin-angiotensin system (RAS) is an important determinant in maintaining adequate systemic blood pressure, and it also may modify organ-specific blood flow. All recognized RAS components have been identified in the eye. In this study, angiotensinogen (ANG) was localized using an affinity-purified anti...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1992-04-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章,评审
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更新日期:2014-05-27 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
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更新日期:2003-08-01 00:00:00
abstract:PURPOSE:To investigate the slow phase in latent/manifest latent nystagmus (LMLN) by producing long eye-drift intervals devoid of fast phases (extended slow phases [ESPs]) and to relate ESP metrics to clinical findings. METHODS:Ten patients with LMLN had eye movements recorded while attending to paired visual and audit...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.03-0324
更新日期:2004-04-01 00:00:00
abstract:PURPOSE:In uveal melanoma, both tumor size and an inflammatory phenotype have been shown to correlate with a poor clinical prognosis. The purpose of this study was to identify whether inflammatory cytokines were present in the vitreous of eyes with uveal melanoma and to determine whether the vitreal concentration of cy...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.12-10123
更新日期:2012-10-01 00:00:00
abstract:PURPOSE:Dry eye disease (DED) produces ocular pain and irritation, yet a detailed characterization of ocular sensitivity in a preclinical model of DED is lacking. The aim of the present study was to assess nociceptive behaviors in an aqueous tear deficiency model of DED in the rat. METHODS:Spontaneous blinking, cornea...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.15-16717
更新日期:2015-05-01 00:00:00
abstract:Purpose:ISG15, a di-ubiquitin-like protein, is critical for controlling certain viral and bacterial infections. We sought to determine if ISG15 plays a role in corneal innate immunity against Candida albicans (C. albicans) using a C57BL/6 (B6) mouse model of human fungal keratitis. Methods:Scarified corneas of adult B...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.17-21476
更新日期:2017-06-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.05-0767
更新日期:2005-12-01 00:00:00
abstract:PURPOSE:To evaluate the pharmacokinetics of ciliary neurotrophic factor (CNTF) delivered over a period of up to 2 years by an intraocular encapsulated cell technology (ECT) implant in patients with retinitis pigmentosa (RP) and geographic atrophy (GA). METHODS:Patients from phase 1 RP (CNTF1); phase 2 GA (CNTF2); and ...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1167/iovs.12-9970
更新日期:2012-11-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.10-5769
更新日期:2010-12-01 00:00:00