Abstract:
:The mechanism of oxidative damage to the lens through intraocular photochemical generation of superoxide and its derivatization to other oxidants such as singlet oxygen, hydroxyl radical and hydrogen peroxide has been studied. Rat lenses when organ cultured aerobically in TC 199 containing additional amounts of riboflavin were damaged as demonstrated by an inhibition of the uptake of Rb 86 against a concentration gradient. The pump was not affected by light if the culture was conducted in the basal TC 199. However, light was observed to induce significant peroxidative degradation of the tissue lipids even in the basal medium, the degradation being indicated by the formation of malonaldehyde. Both the inhibition of the pump as well as the peroxidative degradation of the tissue lipids, were attenuated considerably by scavengers of superoxide and hydrogen peroxide. In addition, the lipid degradation was prevented by vitamins C and E. The results suggest that the photodynamic injury to the lens cation pump as well as to membrane lipids is incumbent upon an initial generation of superoxide and its derivatization to other oxidants. Thus, the ocular lens is susceptible to oxidative insult and physiological damage through photocatalytic generation of various oxygen radicals. Large concentrations of ascorbic acid in the aqueous humor seems to be able to provide significant protection against such an insult. Thus, this may be one of the functions of high concentration of ascorbic acid in the aqueous humor. The implication of oxidative stress has also been examined in the genesis of cataracts in vivo. Treatment with vitamin E of the Emory mouse led to a decrease in the rate of cataract progression suggesting that at least in some instances an oxidative stress could participate in the formation of cataracts. Oxygen radicals may inflict damage at multifarious biochemical sites. Human lens lipids were also shown to have an absorption maxima at 239 nm indicating their susceptibility to oxidative degradation. In addition the lipid extract has fluorescence similar to that of lipofuscins. The levels of MDA were higher in the brunescent cataracts as compared to that in the nonbrunescent cataracts. The implications of oxidative stress towards the genesis of cataracts in humans is being explored further.
journal_name
Curr Eye Resjournal_title
Current eye researchauthors
Varma SD,Chand D,Sharma YR,Kuck JF Jr,Richards RDdoi
10.3109/02713688408997186subject
Has Abstractpub_date
1984-01-01 00:00:00pages
35-57issue
1eissn
0271-3683issn
1460-2202journal_volume
3pub_type
杂志文章,评审abstract::Purified Pseudomonas aeruginosa elastase cleaved a 65 kDa gelatinase [inactive proenzyme form of matrix metalloproteinase (MMP-2)] from human corneal fibroblasts into a biologically active fragment with an approximate molecular mass of 58 kDa. However, purified pseudomonal alkaline protease did not cleave MMP-2 apprec...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713689209015082
更新日期:1992-11-01 00:00:00
abstract::Lenses from normal Wistar rats and those from a Wistar strain with X-ray-induced cataract mutation were examined electron microscopically for morphological characterization and acid phosphatase (AcPase) localization. Ocular anlages of 11 through 18 days of gestation were included in the study. A late-separating or per...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713688409003064
更新日期:1984-04-01 00:00:00
abstract:PURPOSE:To quantify levels of matricellular proteins in aqueous humor samples from acute primary angle closure (APAC) and non-glaucomatous cataract eyes and investigate their correlation with intraocular pressure (IOP) fluctuation. MATERIALS AND METHODS:Aqueous humor samples were collected from 63 eyes including 29 cu...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1080/02713683.2018.1449222
更新日期:2018-06-01 00:00:00
abstract:PURPOSE:To examine the effect of elevated extracellular glucose, thus simulating diabetes, on migration, adhesion and proliferation of SV40 transformed human corneal epithelial (HCE) cells. METHODS:HCE cells were maintained in serum supplemented media containing 5 mM, 17.5 mM or 38 mM D-glucose. Cell migration was det...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1076/ceyr.17.9.924.5133
更新日期:1998-09-01 00:00:00
abstract::Interleukin 4 (IL-4) may play a role in the development of allergic disease. We questioned whether IL-4 related phenomenon occurred on the surface of the conjunctiva during allergic conjunctivitis. Ten patients with cedar pollen-allergic conjunctivitis and 10 patients with postsurgical conjunctivitis were enrolled in ...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713689608997415
更新日期:1996-02-01 00:00:00
abstract:PURPOSE:To examine the effects of external modulation of epithelial-mesenchymal interaction on conjunctival epithelial cell differentiation characteristics. METHODS:Keratin K4 and laminin beta2 chain protein localization was examined in an organotypic model which facilitates the comparison of differentiation character...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1076/ceyr.18.1.28.5394
更新日期:1999-01-01 00:00:00
abstract:PURPOSE:To examine the morphological changes in the meibomian glands of eyes of patients with dry eye disease using the non-contact infrared meibography system and to assess their relationship with meibomian dropout, signs, and tear-film function. METHODS:Subjects included 264 randomly selected patients (528 eyes) suf...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713683.2014.891748
更新日期:2014-10-01 00:00:00
abstract::Processing of visual information within the retina depends in large measure upon a complement of chemical neurotransmitters which are released at synaptic contacts between individual neurons. Numerous investigators have participated in the identification of many of these transmitters and their assignment to specific n...
journal_title:Current eye research
pub_type: 杂志文章,评审
doi:10.3109/02713689609003465
更新日期:1996-07-01 00:00:00
abstract::Calpains are calcium-activated proteinases which have been implicated in tissue differentiation and degeneration. The aims of the present study were: (1) to determine the relationship between postnatal age and calpain activity in the rat retina; (2) to test if calpain activity was aberrant in the RCS retina at differe...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713689508998502
更新日期:1995-08-01 00:00:00
abstract::Achieving the long-term goal of successful engraftment of retinal tissues into eyes blinded by endogenous retinal failure will depend, at least in part, on controlling the immune response to antigens expressed on retinal grafts. Since histoincompatible tissues will have to be used for such transplants, methods to cont...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713689209000743
更新日期:1992-07-01 00:00:00
abstract::Retinal degeneration is a leading cause of untreatable blindness in the industrialised world. It is typically irreversible and there are few curative treatments available. The use of stem cells to generate new retinal neurons for transplantation purposes has received significant interest in recent years and is beginni...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1080/02713683.2019.1669665
更新日期:2020-03-01 00:00:00
abstract:PURPOSE:To measure the cell size and cell density in five layers of the central cornea in the widely used inbred C57BL/6 mouse strain using in vivo three-dimensional (3D) two-photon (2PH) imaging. METHODS:Corneas were scanned using a 2PH laser scanning fluorescence microscope after staining with plasma membrane stain ...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713683.2015.1031253
更新日期:2016-04-01 00:00:00
abstract::This study was conducted to determine the therapeutic efficacy of 3.0 mg/ml ciprofloxacin administered concurrently with one of two salts of prednisolone for the treatment of experimental pseudomonal keratitis. Rabbit corneas were injected intrastromally with Pseudomonas aeruginosa ATCC strain 27853. Sixteen hr after ...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713689309024629
更新日期:1993-05-01 00:00:00
abstract:PURPOSE:Choroidal neovascularization (CNV) is a major cause of vision loss in patients with age-related macular degeneration (AMD). Stromal cell-derived factor-1 (SDF-1)/CXC chemokine receptor 4 (CXCR4) plays a critical role in homing of bone marrow-derived cells (BMCs) to choroidal neovascularization (CNV). In this st...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713683.2011.593107
更新日期:2011-09-01 00:00:00
abstract::Spontaneous ocular shedding and adrenergic induction of ocular shedding were examined in rabbits infected with ten strains of herpes simplex virus type 1 (HSV-1): McKrae, KOS, F, Rodanus, 17 Syn+, RE, E-43, SC-16, MacIntyre, and CGA-3. All ocular inoculations were with 50 microliter of HSV-1 with titers between 1-10 X...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713688709020074
更新日期:1987-01-01 00:00:00
abstract:PURPOSE:This study was carried out in order to determine the most potent and novel uveitopathogenic sites of recoverin using synthetic peptides. METHODS:Several synthetic peptides containing the recoverin sequence plus adjuvants were injected into Lewis rats, and the uveitopathogenic sequence was defined, clinically, ...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1076/ceyr.22.4.304.5503
更新日期:2001-04-01 00:00:00
abstract:PURPOSE:To evaluate the effect of anterior migration of triamcinolone acetonide on intraocular pressure (IOP) elevation after posterior subtenon injection of triamcinolone acetonide (PSTA) for macular edema. METHODS:One hundred and ten eyes from 89 patients who received PSTA for macular edema were prospectively enroll...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1080/02713683.2020.1826979
更新日期:2020-09-27 00:00:00
abstract:PURPOSE:Deficiency in Cystathionine β-synthase (CBS) leads to an abnormal accumulation of homocysteine and results in classical homocystinuria, a multi-systemic disorder that affects connective tissue, muscles, the central nervous system, and the eyes. However, the genetic players and mechanisms underlying vision alter...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1080/02713683.2020.1818262
更新日期:2020-09-07 00:00:00
abstract::After the debridement of the entire corneal epithelium of the rabbit eye, epithelial cells of conjunctival origin cover the denuded corneal surface. Under such experimental conditions, the rate of wound healing is considerably delayed and total regeneration is completed within 15 to 20 days, allowing evaluation of var...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713688709025230
更新日期:1987-10-01 00:00:00
abstract:AIM OF THE STUDY:The similarity of many benign intrabulbar lesions to a malignant tumor requires detailed differential diagnostics. However, none of the known methods can be used as the only one to determine the type of lesions. The aim of this study was to determine color Doppler imaging (CDI) markers characteristic o...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1080/02713683.2017.1341534
更新日期:2017-11-01 00:00:00
abstract:PURPOSE:To investigate the characteristics of anterior chamber inflammatory reaction induced by intravitreal injection of endothelin-1 (ET-1). METHODS:The time course of changes in aqueous protein concentration (APC) after intravitreal injection of 10(-4), 10(-5), 10(-6) and 10(-7) M ET-1 into rabbit eyes was measured...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1076/ceyr.17.2.205.5612
更新日期:1998-02-01 00:00:00
abstract:PURPOSE:Alternative splicing of the last exon (exon 8) of vascular endothelial growth factor (VEGF) pre-mRNA is a key element in the balance of pro- and anti-angiogenic VEGF isoforms in exudative age-related macular degeneration (exAMD) and proliferative diabetic retinopathy (PDR). Three splicing factors, SRp40, ASF/SF...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713683.2010.548892
更新日期:2011-04-01 00:00:00
abstract::Recently, all the structural features of non-proliferative diabetic retinopathy have been demonstrated in mice fed 30% galactose for 21-26 months. To determine whether changes in retinal matrix protein mRNA levels occur early in the course of murine diabetes we used a competitive RT-PCR method to quantitate retinal mR...
journal_title:Current eye research
pub_type: 杂志文章
doi:
更新日期:2000-07-01 00:00:00
abstract::Reduced glutathione (0.3 mM) stimulates the activity of sodium-potassium activated ATPase (Na+K+ATPase) by 54% in plasma membranes prepared from bovine corneal endothelial cells. Oxidized glutathione, however, has no effect on Na+K+ATPase activity in the same tissue, although it does inhibit magnesium activated ATPase...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713688109019985
更新日期:1981-01-01 00:00:00
abstract::In the Royal College of Surgeons rat, the migration of phagocytic cells into the subretinal space accompanies photoreceptor cell death during the early stages of retinal dystrophy. These are followed closely by cellular alterations in the retinal pigment epithelium, Müller cells, and outer retinal vessels. We have ide...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713689308999475
更新日期:1993-03-01 00:00:00
abstract:PURPOSE:To examine the association between macular pigment optical density (MPOD) and rod-mediated dark adaptation (RMDA) in persons ≥60 years old with normal maculas as determined by an accepted color fundus photography grading system. METHODS:This cross-sectional analysis used baseline data from eyes in the Alabama ...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1080/02713683.2018.1460380
更新日期:2018-07-01 00:00:00
abstract::Free radicals and oxidative damage play roles in aging and age-related ocular diseases such as cataracts, so defensive mechanisms become important factors for protection. Because N-acetylation is involved in a wide variety of detoxification processes, this study was conducted to examine the relationship between the ac...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1080/02713680591003799
更新日期:2005-10-01 00:00:00
abstract::The efficiency of protein immobilization to provide a hydrogel surface with a high affinity for corneal epithelial cells was investigated. The cell adhesive proteins collagen and fibronectin, and the cell adhesive oligopeptide RGDS (arginine-glycine-aspartic acid-serine) were successfully covalently immobilized on pol...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.3109/02713689109020325
更新日期:1991-10-01 00:00:00
abstract:PURPOSE:To review the microbiological spectrum and antibiotic sensitivities of the pathogens that cause culture-proven endophthalmitis and to understand the status and trends of antibiotic susceptibility at a public hospital over a 10-year period. METHODS:The data of 577 culture-proven endophthalmitis isolates collect...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1080/02713683.2016.1188118
更新日期:2017-03-01 00:00:00
abstract:PURPOSE:To investigate the biomechanical effect induced by radial keratotomy on outflow facility in paired, enucleated whole porcine eyes. METHODS:Freshly enucleated porcine eyes were perfused at a constant pressure of 10 mm Hg. Radial keratotomy (RK), with a 3.5 mm central clear zone and eight radial incisions, was p...
journal_title:Current eye research
pub_type: 杂志文章
doi:10.1076/ceyr.16.12.1193.5027
更新日期:1997-12-01 00:00:00