Ying Fan

First People's Hospital Chenzhou, Chenchow, Hunan, China

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Publications (10)24.57 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Diabetic retinopathy (DR) is a common complication of diabetes. DR obstructs blood supply to the retina and has serious and long-lasting detrimental effects on quality of life. Panretinal photocoagulation, a laser surgical intervention, is advocated for early treatment of DR to prevent visual loss; however, results from studies reporting its efficacy vary markedly. In this review, we systematically conducted a database search of randomized controlled trials that investigated the safety and efficacy of different types of laser interventions, alone or in combination with adjunct intravitreal steroid utilization, in patients with DR. Data from 14 studies demonstrated that panretinal photocoagulation can be a safe and effective option for reducing visual loss and blindness in patients with DR.
    Expert Review of Medical Devices 08/2014; · 2.43 Impact Factor
  • Dawei Luo, Ying Fan, Xun Xu
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    ABSTRACT: The accumulation of advanced glycated end products (AGEs) in retinal blood vessels is one of the major etiological factors contributing to diabetic retinopathy. Aminoguanidine (AG) is one of the most extensively used inhibitors of AGEs formation. The aim of this study was to investigate whether AG could protect the development of diabetic retinopathy through inhibition of AGEs. Rat diabetes was induced by intraperitoneal injection with streptozotocin (STZ). AG was given to rats in drinking water. Retina was extracted 3 and 6 months following STZ and AG administration. Immunochemistry and transmission electron microscope were used to detect the expression of AGEs and retina morphology. Extensive staining of AGEs was detected in retinal blood vessels of 3- and 6-month diabetic rats, while no significant staining was found in the control non-diabetic retina or AG treated groups. Pericyte loss, endothelial cell proliferation, increased ratio of endothelial cells/pericytes, acellular capillaries and capillary occlusion were observed in the retina of 6-month diabetic rats. The increased electron density of retinal capillary basement membrane, mitochondrial swelling in pericytes and endothelial cells were also found in 6-month diabetic rats. The 3-month diabetic rats and the AG-treated rats did not have similar morphological changes compared to control group. The AGEs staining in AG-treated rats was still weakly positive. AGEs plays pivotal roles in diabetic retinopathy. AGE deposition occurs prior to retinal microvasculature changes. AG could prevent the onset and development of diabetic retinopathy through inhibition of AGEs.
    Bioorganic & medicinal chemistry letters 05/2012; 22(13):4386-90. · 2.65 Impact Factor
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    ABSTRACT: To identify the correlation between serum-based differentially expressed proteins and pathological myopia. It was a case-control study. The serum of 30 pathological myopia patients and 30 age- and gender-matched normal controls were collected from Shanghai First People's Hospital affiliated to Shanghai Jiaotong University. These patients were divided into 4 groups including macular-off retinal detachment (8 cases), retinal geographic atrophy (5 cases), macular hole (11 cases) and choroidal neovascular (6 cases). The serum specimens of normal controls were used as immunogen to immune rabbits in order to prepare polyclonal antibodies. Purified by Protein A cartridge, these mixed antibodies were then combined with CNBr-activated Sepharose so as to synthesize affinity medium which was finally used to treat the serum specimens. According to the theory of antigen and antibody, common background proteins would be deleted. The remaining non-binding proteins were analyzed by capillary high-performance liquid chromatography and LTQ-MASS. Nonparametric statistical analysis was used to detect the correlation each differentially expressed protein. The result of HPLC and LTQ-MASS in 30 specimens of patients revealed 4 peaks of differentially expressed proteins including JTR (positive in 18 specimens, 60%), HP( positive in 11 specimens, 36.7%), HPX (positive in 10 specimens, 33.3%), APO (positive in 8 specimens, 26.7%). There were positive correlations between these 4 proteins (the correlation between TTR and HP, HPX, APO is r = 0.480, 0.577, 0.492; the correlation between HP and TTR, HPX, APO is r = 0.480, 0.783, 0.636; the correlation between HPX and TTR, HP, APO is r = 0.577, 0.783, 0.853; the correlation between APO and TTR, HP, HPX is r = 0.492, 0.636, 0.853; P < 0.05). In group of macular hole, TTR was positive expressed in 7 specimens while other differential proteins were low expression. In group of choroidal neovascular, TTR and HP were positive expressed in 6 specimens while HPX was significantly high in 5 specimens. In other two groups, the expression of 4 differential proteins was rather low. Screening molecular biomarkers by serum-based proteomics can efficiently exclude common proteins and find differential proteins correlated with pathological myopia. These differential proteins may become molecular biomarks of pathological myopia in the future.
    [Zhonghua yan ke za zhi] Chinese journal of ophthalmology 03/2012; 48(3):246-52.
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    ABSTRACT: Recent studies have revealed that melatonin exerts strong anti-apoptotic effects. Retina secretes melatonin, and melatonin receptors are distributed in almost all the layers of retina, including the layer of retinal pigment epithelial (RPE) cells. However, it is not known whether melatonin inhibits apoptosis through its anti-oxidant effects and how it works in RPE cells. Here, we show that melatonin decreases H2O2-induced apoptosis in RPE cells partially through protection of mitochondria. Melatonin decreased reactive oxygen species in mitochondria and mitochondrial DNA damage, alleviated structural damage and inhibited cytochrome C release.
    Frontiers in Bioscience 01/2012; 17:1461-8. · 3.29 Impact Factor
  • Jun Shao, Yu Xin, Rongxiu Li, Ying Fan
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    ABSTRACT: To detect serum and vitreous transthyretin (TTR) in high myopia patients and to evaluate potential associations between TTR and clinical parameters and ocular pathologies, including different ocular pathologies. Serum samples from 16 high myopia patients and 4 controls were analyzed by LTQ-MASS. Serum samples from 116 high myopia patients and 86 healthy controls were tested by Western blots and ELISA. Eight healthy and 40 pathologic vitreous samples were analyzed by ELISA. And corresponding serum samples were also analyzed by ELISA. Significant increased TTR serum levels were detected in high myopia patients compared to healthy controls. The high levels of serum TTR were associated with ocular pathologies, long axial length, and low visual acuity. TTR in high myopia patients with macular hole and macular detachment was upregulated in both vitreous and the corresponding serum samples. TTR levels in serum samples of high myopia patients with long axial lengths were higher than in the vitreous. Serum TTR may be a biomarker for high myopia patients with ocular pathologies.
    Clinical biochemistry 03/2011; 44(8-9):681-5. · 2.02 Impact Factor
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    ABSTRACT: to analyze the efficacy of low-energy selective laser trabeculoplasty (SLT) in patients. in 74 patients (74 eyes) with ocular hypertension, suspected glaucoma, or primary open-angle glaucoma, SLT was the first-choice treatment. Thirty-nine patients in the low-energy group received treatment using half of conventional laser energy over 360° of the trabecular meshwork (at 100 points). Thirty-five patients in the control group received conventional laser energy. Patients were observed for 1 year. Complications and intraocular pressure (IOP) were observed. postoperative transient IOP spike (≥ 3 mm Hg) occurred in three eyes on the day of treatment and partial peripheral anterior synechiae occurred in one eye 1 month after treatment only in the control group. Effective rates of treatment (≥ 20% IOP reduction) at week 2 and month 1, 3, 6, and 12 after treatment were 69.23%, 64.10%, 61.54%, 53.85%, and 48.72% in the low-energy group and 71.43%, 71.43%, 60%, 51.43%, and 48.57% in the control group, respectively. There was no statistically significant difference between the two groups at various time points (P = .836, .501, .892, .835, .990). compared with SLT using conventional laser energy, low-energy SLT lowers IOP with fewer complications, making it a safe and effective option.
    Ophthalmic Surgery Lasers and Imaging 01/2011; 42(1):59-63. · 1.46 Impact Factor
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    ABSTRACT: This study was designed to investigate whether synthetic small interference RNA (siRNA) targeting VEGF-A could inhibit mouse corneal neovascularization or not. First, the effect of synthetic siRNA targeting VEGF-A on the expression of VEGF in human retinal pigment epithelial line ARPE-19 cells was examined. Corneal neovascularization was induced on the right cornea of C57BL/6 mice by alkali burn. Mice were randomly divided into 4 groups (21 animals in each group): VEGF-A siRNA group, stable negative siRNA group, saline control group, and blank control group. After alkali burn, except for the blank control group, the other 3 groups were subconjunctivally injected with VEGF-A siRNA, stable negative siRNA, and normal saline, respectively. On days 3 and 7 after alkali burn, the concentration of VEGF in the cornea was determined by ELISA kit. On day 10, the neovascularized corneal area was mensurated, the amount of corneal new vessels was quantified by CD31 immunohistochemical assay of corneal sections, and permeability of new vessels was shown by fluorescence angiography. After comparing the histological appearance of the cornea between the VGF-A siRNA group and the 3 control groups on days 10 and 30, it was found that in the VEGF-A siRNA group, not only was VEGF expression in the cornea induced by alkali burn but also neovascularized corneal area and amount of new vessels were reduced, followed by the permeability of new vessels, and corneal histological structure were improved. It was also found that the exposure to VEGF-A siRNA significantly reduced the VEGF-A mRNA expression in AREP-19 cells. These findings suggested synthetic siRNA targeting VEGF-A delivered by subconjunctival injection could inhibit corneal angiogenesis induced by alkali burn. VEGF-A siRNA could potentially serve as an important therapeutic alternative in the management against unwanted angiogenesis including corneal neovascularization.
    Current eye research 05/2010; 35(5):375-84. · 1.51 Impact Factor
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    ABSTRACT: This study aimed to verify whether the decreased vascular endothelial growth factor (VEGF)-to-pigment epithelium-derived factor (PEDF) ratio can serve as an indicator for the protective effect of angiotensin-converting enzyme inhibitors (ACEIs) on diabetic retinopathy (DR) and to investigate the role of mitochondrial reactive oxygen species (ROS) in the downregulated VEGF-to-PEDF ratio. Diabetic rats and control animals were randomly assigned to receive perindopril or vehicle for 24 weeks, and bovine retinal capillary endothelial cells (BRECs) were incubated with normal or high glucose with or without perindopril. VEGF, PEDF, PPARgamma, and uncoupling protein-2 (UCP-2) in the rat retinas or BREC extracts were examined by Western blotting and real-time RT-PCR. The levels of VEGF and PEDF in cell culture media were examined by ELISA. Mitochondrial membrane potential (Deltapsim) and ROS production were assayed using JC-1 or CM-H2DCFDA. The VEGF-to-PEDF ratio was increased in the retina of diabetic rats; perindopril lowered the increased VEGF-to-PEDF ratio in diabetic rats and ameliorated the retinal damage. In BRECs, perindopril lowered the hyperglycemia-induced elevation of VEGF-to-PEDF ratio by reducing mitochondrial ROS. We found the decreased ROS production was a result of perindopril-induced upregulation of PPARgamma and UCP-2 expression and the subsequent decrease of Deltapsim. It is concluded that the protective effect of ACEI on DR is associated with a decreased VEGF-to-PEDF ratio, which involves the mitochondria-ROS pathway through PPARgamma-mediated changes of UCP-2. This study paves a way for future application of ACEI in treatment of DR.
    Diabetes 03/2009; 58(4):954-64. · 7.90 Impact Factor
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    ABSTRACT: Poly(ADP-ribose)polymerase (PARP) inhibitors decrease angiogenesis through reducing vascular endothelium growth factor (VEGF) induced proliferation, migration, and tube formation of human umbilical vein endothelial cells (HUVECs). In contrast to VEGF, pigment epithelium-derived factor (PEDF) has been demonstrated to act as a strong endogenous inhibitor of angiogenesis. Here, we show that PARP inhibition with a specific inhibitor PJ-34 or specific PARP antisense oligonucleotide upregulates hyperglycemia-induced PEDF expression in HUVECs in a dose-dependent manner. This results in the retard of activation of p38 MAP kinase and the concomitant decrease in cell apoptosis. These results give the first direct demonstration that PEDF might represent a target for PARP inhibition treatment and the effects of PEDF on endothelial cells growth are context dependent.
    Biochemical and Biophysical Research Communications 06/2008; 369(2):718-24. · 2.41 Impact Factor
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    ABSTRACT: Pigment epithelium-derived factor (PEDF) is expressed in several normal organs and identified as an inhibitor of neovascularization. In the present study, we investigated the effect of PEDF in an in vitro model of ocular choroidal neovascularization. Microdissection was used to isolate the human choroidal endothelial cells (CECs), followed by the use of superparamagnetic beads (Dynabeads) coated with the CD31 antibody, which selectively binds to the endothelial cell surface. The mitogenic and motogenic effects of vascular endothelial growth factor (VEGF) on cultured choroidal capillary endothelial cells were examined in the presence or absence of PEDF (1, 10, 100, and 1000 ng/ml) using cell counts and migration assays. Cells bound to the beads were isolated using a magnetic particle concentrator and they were successfully cultured and characterized to be endothelial cells that possessed greater than 95% immunoreactivity to von Willebrand factor. PEDF suppressed the proliferation and migration of VEGF-induced choroidal capillary endothelial cells. However, the concentration of PEDF which we used has little effect on normal CECs. PEDF played an important role on the growth and migration of VEGF-stimulated choroidal endothelial cell. These findings suggest that PEDF may be an effective approach to the treatment of choroidal neovascular disorders.
    Chinese medical journal 10/2007; 120(17):1534-8. · 0.90 Impact Factor

Publication Stats

66 Citations
24.57 Total Impact Points

Institutions

  • 2012
    • First People's Hospital Chenzhou
      Chenchow, Hunan, China
  • 2008–2011
    • Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine
      Shanghai, Shanghai Shi, China
  • 2010
    • Shanghai University
      • Department of Ophthalmology
      Shanghai, Shanghai Shi, China