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Objective: To investigate vitreous levels of reactive oxygen species (ROS) in patients with proliferative diabetic retinopathy (PDR) and analyze ROS levels among different groups of PDR patients.
Design: Retrospective case-control study.
Participants: Thirty-nine eyes of 39 patients with PDR and 16 eyes of 16 non-PDR patients (control group) that underwent primary vitrectomy for complications of PDR and other conditions (control group), with a follow-up time > or = 12 months.
Methods: Proliferative diabetic retinopathy patients were classified into 3 groups according to the extent of fibrovascular proliferation: (1) no or focal adhesions at < or =3 sites (n = 17); (2) > or =1 broad adhesions or vitreous-retinal adhesions around disc, macula, and arcade (n = 12); and (3) vitreous-retinal attachment extending to the periphery or no posterior vitreous detachment with or without retinal detachment (RD) (n = 10). The control group (n = 16) contained non-PDR patients. Vitreous samples were obtained during measurement of vitrectomy and vitreous levels of ROS by luminol-enhanced chemiluminescence assay.
Main Outcome Measures: Reactive oxygen species levels were recorded as mean (+/- standard deviation) chemiluminescence counts per 10 seconds. Correlations of vitreous levels of ROS among the 3 PDR groups and anatomic prognosis were evaluated. Multiple linear regression analysis of selective potential risk factors was performed to investigate the main determinants of ROS levels.
Results: Vitreous ROS levels were significantly higher in patients with PDR (125.76+/-351.72 chemiluminescence counts per 10 seconds) than in control patients (0.37+/-0.72 chemiluminescence counts per 10 seconds; P<0.0001). Reactive oxygen species levels were 1.86+/-1.63 (group 1), 24.47+/-22.68 (group 2), and 457.94+/-597.01 (group 3); the difference among groups was significant (P = 0.001). Regression analysis indicated that only patient grouping (according to the severity of fibrovascular proliferation) had a strong dependent association with ROS levels (P = 0.001). Final anatomic results revealed that recurrent untreatable RD occurred in 3 patients of group 3, who also had the highest ROS levels.
Conclusions: Reactive oxygen species levels were significantly elevated in the vitreous fluid of PDR patients, and patients with a more advanced clinical PDR appearance had higher ROS levels. These findings suggest an association between ROS and the pathogenesis of PDR. Reactive oxygen species might be correlated with PDR severity.
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http://dx.doi.org/10.1016/j.ophtha.2007.05.041 | DOI Listing |
Mol Ther Methods Clin Dev
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Clinical Sciences, North Carolina State University, Raleigh, NC 27607, USA.
Non-infectious uveitis (NIU) is a painful recurrent disease affecting 2%-5% of horses. Current treatments require frequent administration with associated adverse events. In a previous study, intravitreal (IVT) adeno-associated virus (AAV) harboring equine interleukin-10 (eqIL-10) cDNA inhibited experimental uveitis in rats.
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Opthea Limited, Melbourne, Victoria, Australia.
Purpose: Sozinibercept inhibits vascular endothelial growth factors (VEGFs) C and D. This study evaluated outcomes following switching from anti-VEGF-A monotherapy to intravitreal injections of three dose levels of sozinibercept in combination with aflibercept in patients with diabetic macular edema (DME).
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Methods Mol Biol
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Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, TX, USA.
Rift Valley fever virus (RVFV) is an important livestock and human pathogen. It is also a potential bioweapon owing to its ability to spread by aerosols. It is an enveloped virus containing surface protrusions composed of two viral glycoproteins, G and G; the viral core contains ribonucleoprotein complexes.
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Sharon Eccles Steele Center for Translational Medicine, John A. Moran Eye Center, Department of Ophthalmology & Visual Sciences, University of Utah, Salt Lake City, Utah, United States.
Invest Ophthalmol Vis Sci
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NHO Tokyo Medical Center, Tokyo, Japan.
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