Abstract:
:Sildenafil citrate increases ocular blood flow and accelerates the rate of anterior chamber refilling after paracentesis. The latter effect could have resulted from a reduction in outflow facility or from an increase in aqueous humor (AH) production. In this study, we used scanning ocular fluorophotometry to examine the effects of sildenafil on AH turnover, and thus, AH production in eyes of live normal rabbits. For this, the rate of aqueous humor flow (AHF) was quantified with a commercially available fluorophotometer that measured the rate of fluorescein clearance from the anterior segment, which predominantly occurs via the trabecular meshwork. After ≈2 h of control scans to determine the baseline rate of AHF, the rabbits were fed 33 mg of sildenafil and allowed ≈45 min for the drug to enter the systemic circulation. Thereafter, fluorescence scans were retaken for an additional 90-120 min. Sildenafil ingestion increased AHF by about 36%, from 2.31 μL/min to 3.14 μL/min (P < 0.001, as two-tailed paired data, n = 20 eyes). This observation indicates that sildenafil citrate, which is a phosphodiesterase type-5 inhibitor currently marketed as a vasodilator (e.g., Viagra, Revatio), stimulates AHF in rabbits. Our results seem consistent with reports indicating that the drug dilates intraocular arteries and augments intraocular vascular flow. These physiological responses to the agent apparently led to increased fluid entry into the anterior chamber. As such, the drug might have utility in patients with ocular hypotony resulting from insufficient AH formation.
journal_name
Exp Eye Resjournal_title
Experimental eye researchauthors
Alvarez LJ,Zamudio AC,Candia OAdoi
10.1016/j.exer.2013.03.016subject
Has Abstractpub_date
2013-06-01 00:00:00pages
67-70eissn
0014-4835issn
1096-0007pii
S0014-4835(13)00076-6journal_volume
111pub_type
杂志文章abstract::Oxyradicals probably play a major role in a number of specific pathological conditions of intraocular tissues, such as cataract formation and retinal degeneration. This paper reviews some of the mechanistic concepts relating to tissue damage by highly reactive oxidants derived from endogenous precursors, hydrogen pero...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/0014-4835(84)90075-7
更新日期:1984-12-01 00:00:00
abstract::Experimental autoimmune uveoretinitis (EAU) in mice provides a useful platform to study the pathogenesis and experimental therapeutics of human uveitis. One often used EAU model employs C57BL/6 (B6) mice sensitized with a peptide residue having 1 to 20 amino acids of human interphotoreceptor retinoid binding protein (...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2020.108406
更新日期:2020-12-19 00:00:00
abstract::Although a range of changes in anterior segment structures have been documented to occur during accommodation, the quantification of changes in the structure of the anterior sclera during the accommodation process in human subjects has yet to be examined. This study therefore aimed to investigate the presence of short...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2018.07.023
更新日期:2018-12-01 00:00:00
abstract::The purpose of the current study was to localize the lens membrane protein, MIP 26, in nuclear fiber cells from different regions of aged normal and age-related cataractous human lenses. Adult, juvenile, fetal and embryonic nuclear regions in aged normal and age-related nuclear cataractous lenses were morphologically ...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1006/exer.1998.0579
更新日期:1999-01-01 00:00:00
abstract::Giant papillae, characteristic lesions of vernal keratoconjunctivitis, are formed as a result of the proliferation of conjunctival fibroblasts, the deposition of extracellular matrix, and the infiltration of inflammatory cells. The concentration of interleukin (IL)-4 is also increased in the tear fluid of individuals ...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/s0014-4835(02)00248-8
更新日期:2003-01-01 00:00:00
abstract::Steady state photoreceptor specific mRNA levels in bovine retina were studied during fetal maturation for five gene transcripts, including rhodopsin, arrestin (S-antigen), rod alpha-subunit of transducin, interphotoreceptor retinoid-binding protein (IRBP) and rod alpha-subunit of cGMP phosphodiesterase in order to und...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1006/exer.1993.1034
更新日期:1993-03-01 00:00:00
abstract:PURPOSE:To investigate the potential protective effect of novel G protein coupled estrogen receptor (GPER1) against the neurotoxicity induced by NMDA in the mouse retina. METHODS:We induce retinal ganglion cells (RGCs) toxic injury through intravitreal injection of NMDA or acute ocular hypertension (AOH) induced by an...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2019.107826
更新日期:2019-12-01 00:00:00
abstract::We previously demonstrated that there are two waves of increased collagen synthesis following corneal laceration in rabbits. In the present study, we have examined whether increases in collagen synthesis and degradation result from increased amounts of mRNAs for collagen and collagenase, respectively. Rabbits were ane...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/0014-4835(91)90086-t
更新日期:1991-03-01 00:00:00
abstract::(O-acyl) ω-hydroxy fatty acids (OAHFAs) are a recently found group of polar lipids in meibum. Since these lipids can potentially serve as a surfactant in the tear film lipid layer, the surface properties of a molecule of this lipid class was investigated and compared with a structurally related wax ester and a fatty a...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2013.06.016
更新日期:2013-10-01 00:00:00
abstract::We investigated the inhibitory action of a synthetic peptidyl hydroxamate inhibitor of matrix metalloproteinase (MMP), Galardin (GM6001), on collagen degradation by rabbit corneal stromal fibroblasts (keratocytes) cultured three-dimensionally in the type I collagen gel with medium containing interleukin 1alpha (IL-1al...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1006/exer.1998.0637
更新日期:1999-05-01 00:00:00
abstract::We sought to characterize the ocular pharmacology, tolerability and intraocular pressure (IOP)-lowering efficacy of FR-190997, a non-peptidic bradykinin (BK) B2-receptor agonist. FR-190997 possessed a relatively high receptor binding affinity (Ki = 27 nM) and a high in vitro potency (EC50 = 18.3 ± 4.4 nM) for inositol...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2014.10.008
更新日期:2014-11-01 00:00:00
abstract::Over the past 40 years, several groups have shown that epithelial debridement results in the death of keratocytes subjacent to the wound area. More recently this cell death has been shown to involve apoptosis. The purpose of this project was to examine the proliferative response of the normally quiescent keratocytes t...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1006/exer.2000.0926
更新日期:2001-01-01 00:00:00
abstract::The aim of this study was to examine the murine subbasal nerve fibre plexus (SNP) regeneration altered by surgical dissection. Investigations in the mouse model addressed the regeneration capabilities of the SNP, and the influence of local ciliary neurotrophic factor (CNTF) application on the regeneration process. In ...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2013.12.015
更新日期:2014-03-01 00:00:00
abstract::Age-related Macular Degeneration (AMD) is the leading cause of visual impairment and blindness in the elderly in developed countries. Neovascular/exudative (wet) AMD is the aggressive form of AMD and can involve choroidal neovascularization and vascular leakage. Anti-vascular endothelial growth factor (anti-VEGF) medi...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2016.02.010
更新日期:2016-04-01 00:00:00
abstract::The polarity of retinal pigmented epithelia (RPE) from chicken embryos was studied in primary cell culture. Since cultured RPE approximates the morphological polarity of RPE in vivo, we investigated whether this polarity extends to the distribution of plasma membrane proteins that are peculiar to RPE. In contrast to o...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/0014-4835(90)90156-o
更新日期:1990-10-01 00:00:00
abstract::The suggested common regulator of the eye lens crystallin genes is c-Maf. Maf responsive elements have been detected in a number of crystallin promoters including that of the rat betaB2-crystallin gene. The betaB2-crystallin gene is active in the post-natal lens and its mRNA reaches its maximal level in the rat lens 6...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1006/exer.2001.1077
更新日期:2001-11-01 00:00:00
abstract::The part of the light spectrum which is responsible for an increase of lenticular green autofluorescence upon white light exposure was determined for the rabbit. The increase of autofluorescence as a function of the light energy was measured, to assess a possible threshold energy for lens alterations. Thirteen rabbits...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1006/exer.1993.1045
更新日期:1993-03-01 00:00:00
abstract::The response of the lens to changes in the distribution and concentration of electrolytes can be measured by characterizing the changes in resistivity that occur secondary to variations in intracellular composition. Regional intracellular cytoplasmic resistivities of lens fiber cells can be approximated by homogenates...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/s0014-4835(87)80164-1
更新日期:1987-04-01 00:00:00
abstract::The interaction of keratocytes with extracellular matrix components plays an important role in the maintenance of corneal transparency and shape as well as in the healing of corneal wounds. In particular, the interaction of these cells with collagen and cell-mediated collagen contraction contribute to wound closure. E...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2020.107933
更新日期:2020-02-01 00:00:00
abstract::Cynomolgus (Macaca fascicularis) monkeys from three families, which showed symptoms of early onset macular degeneration was studied. Two proteins, albumin and glyceraldehyde 3-phosphate dehydrogenase, were found to have markedly altered concentrations in whole retina of the monkeys with early onset macular degeneratio...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1006/exer.1996.0026
更新日期:1996-03-01 00:00:00
abstract::In order to develop effective optical treatment strategies for myopia, it is important to understand how visual experience influences refractive development. Beginning with the discovery of the phenomenon of form deprivation myopia, research involving many animal species has demonstrated that refractive development is...
journal_title:Experimental eye research
pub_type: 杂志文章,评审
doi:10.1016/j.exer.2012.11.019
更新日期:2013-09-01 00:00:00
abstract::Metabolomics studies in the retina and retinal pigment epithelium (RPE) in animal models or postmortem donors are essential to understanding the retinal metabolism and to revealing the underlying mechanisms of retinal degenerative diseases. We have studied how different methods of euthanasia (CO2 or cervical dislocati...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2018.05.032
更新日期:2018-09-01 00:00:00
abstract::Deficient cGMP-phosphodiesterase (cGMP-PDE) activity results in elevated levels of cGMP in the rd retina before any pathological signs are observed. Since the enzyme is present in rd retina, although it is barely activated by light, we determined whether its synthesis starts at the same time as that of cGMP-PDE in nor...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/s0014-4835(88)80026-5
更新日期:1988-03-01 00:00:00
abstract::The extracellular matrix (ECM) plays a significant role in cellular and retinal health. The study of retinal tyrosine-sulfated proteins is an important first step toward understanding the role of ECM in retinal health and diseases. These secreted proteins are members of the retinal ECM. Tyrosine sulfation was shown to...
journal_title:Experimental eye research
pub_type: 杂志文章,评审
doi:10.1016/j.exer.2014.07.007
更新日期:2015-04-01 00:00:00
abstract::The purpose of this study was to assess the effect of taurine and apical potassium concentration modelling in vivo light evoked changes on the transepithelial potential (TEP) and the transepithelial resistance (TER) of isolated bovine retinal pigment epithelium (RPE). Isolated specimens of bovine non-tapetal RPE-Bruch...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2005.06.020
更新日期:2006-02-01 00:00:00
abstract::The combined effects of adenosine and acetylcholine on the intracellular free-Ca2+ concentration in nonpigmented epithelial cells of the rabbit ciliary body were investigated using fura-2 fluorescence-ratio imaging. Acetylcholine (10 microM) by itself produced a modest increase in [Ca2+]i. Acetylcholine in combination...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1006/exer.1996.0194
更新日期:1997-02-01 00:00:00
abstract::The effects of metabolic inhibitors on the apical and basal membrane potentials were studied in the isolated retinal pigment epithelium of the lizard Gekko gekko. Adding dinitrophenol or cyanide or cooling the tissue to 15 degrees C first depolarized the apical membrane and then hyperpolarized the basal membrane. The ...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/0014-4835(90)90015-m
更新日期:1990-01-01 00:00:00
abstract::Bubble-based acoustic radiation force aims to measure highly localized tissue viscoelastic properties. In the current investigation, acoustic radiation force was applied to laser-induced bubbles to measure age-related changes in the spatial distribution of elastic properties within in vitro porcine lenses. A potential...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2006.10.007
更新日期:2007-02-01 00:00:00
abstract::Previously, we demonstrated that the inwardly rectifying K(+) (Kir) channel subunit Kir7.1 is highly expressed in bovine and human retinal pigment epithelium (RPE). The purpose of this study was to determine whether any of the 14 other members of the Kir gene family are expressed in native human RPE. Conventional reve...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2008.05.010
更新日期:2008-09-01 00:00:00
abstract::The trabecular meshwork is considered a smooth muscle like tissue contributing to aqueous outflow regulation and thus to regulation of intraocular pressure. An elevation in intraocular pressure is one of the greatest risk factors for most forms of glaucoma. We assume that contraction of trabecular meshwork reduces aqu...
journal_title:Experimental eye research
pub_type: 杂志文章
doi:10.1016/j.exer.2004.12.013
更新日期:2005-06-01 00:00:00