Jian Ge

Sun Yat-Sen University, Shengcheng, Guangdong, China

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Publications (200)415.56 Total impact

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    ABSTRACT: Endoplasmic reticulum (ER) stress has been implicated in various neurodegenerative diseases, including Alzheimer's disease. We have previously observed amyloid production in the retina of the Tg2576 transgenic mouse model of Alzheimer's disease. In this study, we used tunicamycin-induced ER stress in RGC-5 cells, a cell line identical to the photoreceptor cell line 661W, to investigate the effect of ER stress on production of amyloid-beta (Abeta) peptides. We found that the mRNA level of amyloid-beta precursor protein (APP) remained stable, while the protein level of amyloid-beta precursor protein (APP) was decreased, the amyloid-beta precursor protein cleaving enzymes beta-site APP-cleaving enzyme 1 and presenilin 1 were upregulated, Abeta1-40 and Abeta1-42 production were increased, and reactive oxygen species production and apoptosis markers were elevated following induction of ER stress. The protein level of Abeta degradation enzymes, neprilysin, endothelin-converting enzyme 1, and endothelin-converting enzyme 2 remained unchanged during the prolonged ER stress, showing that the generation of Abeta did not result from reduction of proteolysis by these enzymes. Inclusion of group II caspase inhibitor, Z-DEVD-FMK, increased the ER stress mediated Abeta production, suggesting that they are generated by a caspase-independent mechanism. Our findings provided evidence of a role of ER stress in Abeta peptide overproduction and apoptotic pathway activation in RGC-5 cells.
    Cell Stress and Chaperones 03/2014; · 2.48 Impact Factor
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    ABSTRACT: The aim of this study was to investigate the safety and efficacy of intravitreal injection of (99)Tc-MDP, a decay product of (99m)Tc-MDP, on the development of laser-induced choroidal neovascularization (CNV) in rhesus monkeys. Experimental CNV was induced by argon laser with a small high-energy laser spot. Monkeys were given 50 μL of (99)Tc-MDP at a concentration of 0.005 μg/mL (n = 6) or 0.01 μg/mL (n = 6) by intravitreal injection once a week immediately after laser injury for a period of 56 days. Control animals were treated with the same volume of PBS (n = 6) in the same way. Eyes were monitored by ophthalmic examination, color fundus photography, fluorescence fundus angiography (FFA), optical coherence tomography (OCT) and histology. Incidences of grade 4 CNV lesions as well as the leakage areas of grade 4 CNVs on the late-phase of fluorescein angiograms were measured in a standardized, randomized and masked fashion fortnightly. The maximum widths and heights of grade 4 CNVs were also calculated by histology at the end of the experiment. Toxicity of (99)Tc-MDP on the retina was evaluated by electroretinogram (ERG) and histologic analysis. (99)Tc-MDP reduced the incidences of grade 4 CNVs by 33.33 % and 39.40 % in the 0.005 μg/mL and 0.01 μg/mL groups, respectively, compared with the PBS group on day 28 (P < 0.05; n = 6). The leakage areas of grade 4 CNVs were smaller in the 0.005 μg/mL (0.7136 ± 0.0283 mm(2), p <0.01; n = 6) and 0.01 μg/mL (0.4351 ± 0.0349 mm(2), p < 0.01; n = 6) groups than those in the PBS control group (0.9373 ± 0.0455 mm(2); n = 6) in a dose-dependent manner on day 28. OCT and histology also showed that the sizes of CNVs were smaller in the (99)Tc-MDP treated groups than those in the PBS group. Although intravitreal injection of (99)Tc-MDP led to mild inflammatory reaction in the anterior chamber, histology and ERG findings demonstrated that (99)Tc-MDP did not cause any change in histological structure or function of the retina (p>0.05). Intravitreal injection of (99)Tc-MDP can inhibit the development of laser-induced CNV without toxic effect on retina, suggesting that (99)Tc-MDP has therapeutic potential for CNV related diseases.
    Albrecht von Graæes Archiv für Ophthalmologie 01/2014; · 1.93 Impact Factor
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    ABSTRACT: Tetramethylpyrazine (TMP) is one of the active ingredients extracted from the Chinese herb Chuanxiong, which has been used to treat cerebrovascular and cardiovascular diseases, pulmonary diseases and cancer. However, the molecular mechanisms underlying the actions of TMP have not been fully elucidated. In a previous study we showed that TMP-mediated glioma suppression and neural protection involves the inhibition of CXCR4 expression. The SDF-1/CXCR4 axis plays a fundamental role in many physiological and pathological processes. In this study, we further investigated whether the regulation of the SDF-1/CXCR4 pathway is also involved in the TMP-mediated inhibition of neovascularization or fibrosis and improvement of microcirculation. Using a scratch-wound assay, we demonstrated that TMP significantly suppressed the migration and tubule formation of the human umbilical vein endothelial cell line ECV304 in vitro. The expression of CXCR4 in ECV304 cells is notably down-regulated after TMP treatment. In addition, TMP significantly suppresses corneal neovascularization in a rat model of corneal alkali burn injury. The expression of CXCR4 on days 1, 3 and 7 post-injury was determined through RT-PCR analysis. Consistent with our hypotheses, the expression of CXCR4 in the rat cornea is significantly increased with alkali burn and dramatically down-regulated with TMP treatment. Moreover, TMP treatment significantly attenuates bleomycin-induced rat pulmonary fibrosis, while immunofluorescence shows a notably decreased amount of CXCR4-positive cells in the TMP-treated group. Furthermore, TMP significantly down-regulates the expression of CXCR4 in platelets, lymphocytes and red blood cells. Whole-blood viscosity and platelet aggregation in rats are significantly decreased by TMP treatment. These results show that TMP exerts potent effects in inhibiting neovascularization, fibrosis and thrombosis under pathological conditions; thus, the underlying mechanism of TMP might partially contribute to the down-regulation of CXCR4.
    PLoS ONE 01/2014; 9(2):e88176. · 3.73 Impact Factor
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    ABSTRACT: To evaluate and compare the structural differences of the ciliary body in eyes with and without malignant glaucoma. Cross-sectional study. Twenty-seven consecutive patients diagnosed with malignant glaucoma in 1 eye after trabeculectomy were recruited. They were all originally diagnosed with primary angle closure (PAC) or PAC glaucoma (PACG). Twenty-seven PAC/PACG eyes of 27 patients who had undergone uneventful trabeculectomy in the same period were also recruited. They were comparable with the fellow eyes of the malignant glaucoma patients in terms of surgical type, glaucoma type, and stage. A-scan ultrasonography and ultrasound biomicroscopy measurements were performed on the eyes with malignant glaucoma, the fellow eyes of the patients with malignant glaucoma, and the matched eyes. Ciliary body parameters included maximum ciliary body thickness (CBTmax), ciliary body thickness at the point of the scleral spur (CBT0) and 1000 μm from the scleral spur (CBT1000), anterior placement of the ciliary body (APCB), and the trabecular-ciliary process angle (TCA). Biometric measurements including axial length, central anterior chamber depth (ACD), pupil diameter (PD), anterior chamber width, and lens vault (LV) were also recorded. Average CBTmax were 0.545±0.088 (mean ± standard deviation), 0.855±0.170, and 0.960±0.127 mm in eyes with malignant glaucoma, their fellow eyes, and the matched eyes, respectively. Average APCB were 0.860±0.176, 0.608±0.219, and 0.427±0.139 mm, respectively. Average TCA were 18.49±4.12, 41.79±17.27, and 48.53±10.38 degrees, respectively. The CBTmax, CBT0, CBT1000, and TCA were smaller, whereas APCB was larger in eyes with malignant glaucoma compared with their fellow eyes (P < 0.01). The fellow eyes had larger APCB and smaller CBTmax and CBT0 than the matched eyes (P < 0.05). The ACD, anterior chamber width, and PD were smaller, whereas LV was larger in eyes with malignant glaucoma compared with their fellow eyes (P < 0.05). No differences were found in the ACD, anterior chamber width, PD, or LV between the fellow eyes of malignant glaucoma and matched eyes (P > 0.1). The ciliary bodies were thinner and more anteriorly rotated in eyes with malignant glaucoma as well as in their fellow eyes, which may be the predisposing factor for malignant glaucoma.
    Ophthalmology 12/2013; · 5.56 Impact Factor
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    ABSTRACT: To compare anterior chamber paracentesis (ACP) with standard medical management of acute primary angle closure (APAC). Prospective study. Patients with APAC and intraocular pressure (IOP) ≥50 mm Hg were enrolled. Patients were randomized to receive ACP and medical treatment (group 1) or medical management alone (group 2). There were 26 patients (mean age 69.3 ± 10.4 years, 31 eyes) in group 1 and 28 patients (mean age 67.0 ± 9.7 years, 30 eyes) in group 2. The IOP in group 1 was significantly lower at 15 minutes, 30 minutes, and 1 hour after treatment (p < 0.05). At 1, 2, and 24 hours after treatment, visual acuity was significantly better in group 1 than in group 2. At each time point after treatment, the grade of corneal edema was not different between the groups. Pain score at 1 and 2 hours after treatment was significantly lower in group 1 than in group 2; however, no difference was noted at 24 hours after treatment. The mean follow-up period in group 1 was 16.1 ± 1.3 months and in group 2 was 15.6 ± 1.4 months (p = 0.803). At last follow-up, IOP, pupil size, number of eyes with nonreactive pupils, and centre endothelial cell counts were not different; however, visual acuity was significantly better in group 1 (0.43 ± 0.06 logMAR vs 0.74 ± 0.10 logMAR, p = 0.007). Immediate ACP is a safe and effective for rapidly lowering IOP, and is associated with better visual acuity than medical treatment alone.
    Canadian Journal of Ophthalmology 12/2013; 48(6):553-8. · 1.15 Impact Factor
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    ABSTRACT: To gain insight into the potential mechanism of mitochondria dysfunction in pathogenesis, progression and therapeutic management of glaucoma. The data used in this review were mainly published in English from 2000 to present obtained from PubMed. The search terms were "mitochondria", "glaucoma" and "trabecular meshwork" or "retinal ganglion cells". Articles studying the mitochondria-related pathologic mechanism and treatment of glaucoma were selected and reviewed. Mitochondrial dysfunction or injury was demonstrated in different eye tissue of glaucoma. A variety of potential injuries (light, toxic materials, oxidative injury, mechanical stress, aging, etc.) and the inherent DNA defects are deemed to cause mitochondrial structural and functional destruction in trabecular meshwork cells, retinal ganglion cells, etc. of glaucoma. In addition, various new experimental and therapeutic interventions were used to preserve mitochondrial function, which may be useful for protecting against optic nerve degeneration or reducing the death of retinal ganglion cells in glaucoma. Mitochondria play an important role in the pathogenesis of glaucoma, various strategies targeting mitochondrial protection might provide a promising way to delay the onset of glaucoma or protect RGCs against glaucomatous damage.
    Chinese medical journal 11/2013; 126(22):4358-65. · 0.90 Impact Factor
  • Xiu-Lan Zhang, Jian Ge
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    ABSTRACT: Ex-Press miniature implant surgery (Ex-Press implantation) is a new alternative anti-glaucoma surgery. It is clinically important to clarify its indications. Ex-Press implantation has been indicated appropriate in primary open-angle glaucoma and should not be used in narrow angle-closure glaucoma and in high risk of failed scarring cases. More evidence-based studies are still needed to convince the pros and cons in other conditions including aphakia or pseudo-phakia glaucoma, secondary open-angle glaucoma and refractory glaucoma.
    [Zhonghua yan ke za zhi] Chinese journal of ophthalmology 11/2013; 49(11):963-4.
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    ABSTRACT: Locating the medial cut end of the severed canaliculus is the most difficult aspect of canalicular repair, especially in patients with more medial laceration, severe oedema, persistent errhysis and a narrow canaliculus. Irrigation is a widely used technique to identify the cut end; however, we found that air injected through the intact canaliculus with a straight needle failed to reflux when the common canaliculus or lacrimal sac was not blocked. We describe a simple, safe and efficient air-injection technique to identify the medial cut edge of a lacerated canaliculus. In this method, we initially submersed the medial canthus under normal saline, then injected filtered air through the intact canaliculus using a side port stainless steel probe with a closed round tip. The tip was designed to block the common canaliculus to form a relatively closed system. The efficiency of this novel air-injection technique was equivalent to the traditional technique but does not require the cooperation of the patient to blow air. Using this technique, the medial cut end was successfully identified by locating the air-bubble exit within minutes in 19 cases of mono-canalicular laceration without any complication.
    The British journal of ophthalmology 09/2013; · 2.92 Impact Factor
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    ABSTRACT: Nanophthalmos is a rare congenital disorder associated with a high incidence of angle-closure glaucoma. We followed the clinical manifestations of three siblings to evaluate their responses to various treatments. Three sisters with nanophthalmos were followed from 2000 to 2013. Glaucoma and cataract treatments were performed whenever indicated. The oldest sister had chronic elevation of intraocular pressure (IOP) and underwent laser peripheral iridotomy (LPI) on both eyes, followed by uneventful phacoemulsification with intraocular lens (IOL) implantation on the left eye and phacotrabeculectomy with IOL implantation on the right eye. The middle sister had acute elevation of IOP and initially underwent phacoemulsification combined with implantation of two IOLs on her left eye and LPI on her right eye. Severe uveal effusion occurred when phacoemulsification was performed on her right eye 6 years later, but ultimately was completely resolved. In both sisters, stable IOP and visual results were achieved after lensectomy. The youngest sister, who had suspected angle-closure, achieved a stable IOP and visual results with prophylactic LPI alone. In nanophthalmic eyes, the severity of the disease may foreshadow the severity of surgical complications and responses to therapy.
    Eye science. 09/2013; 28(3):113-8.
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    ABSTRACT: Type and incidence of adverse events and rate of discontinuations for 2 years of daily wear with silicone hydrogel contact lenses in Chinese children with myopia. Two hundred forty children aged 7 to 14 years were enrolled in a prospective randomized clinical trial from November 2008 to April 2009. Children with myopia of up to -3.50 diopters (D) spherical equivalent with astigmatism less than or equal to -0.75 D were randomized to one commercial and three experimental lens designs of Lotrafilcon B silicone hydrogel lenses (four groups) used bilaterally on a daily wear, monthly replacement schedule. The main outcome measures were incidence per 100 patient-years (incidence, in percentage) of adverse events and rate of discontinuations. There were no events of microbial keratitis. Fifty-five adverse events (incidence, 14.2%) were seen. There were also 12 recurrent events. The type and incidence percentage were contact lens papillary conjunctivitis (16 events, 4.1%), superior epithelial arcuate lesions (SEALs, six events, 1.5%), corneal erosions (eight events, 2.1%), infiltrative keratitis (five events, 1.3%), asymptomatic infiltrative keratitis (seven events, 1.8%), and asymptomatic infiltrates (13 events, 3.42%). There were differences in the incidence of SEALs between groups (p = 0.023), with the incidence of SEALs being greater with one of the experimental designs. No event resulted in any vision loss. Seventy participants (29.2%) discontinued, with one-third (26 participants, 10.8%) occurring in the first month of lens wear. Discomfort and non-lens-related reasons such as safety concern and disinterest were frequently cited reasons for discontinuations. Adverse events with daily wear of silicone hydrogels in children were mainly mechanical in nature, and significant infiltrative events were few. The large number of dropouts in the early days of lens wear and their reasons for discontinuation suggest that adaptation and patient motivation are critical for survival in lens wear.
    Optometry and vision science: official publication of the American Academy of Optometry 08/2013; · 1.53 Impact Factor
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    ABSTRACT: To compare the eye with chronic primary angle-closure glaucoma (CPACG) with its fellow eye without glaucoma damage and to determine the biometric differences that may predispose to development of CPACG. Consecutive patients diagnosed with CPACG in 1 eye and primary angle-closure (PAC)/primary angle-closure suspected (PACS) in the fellow eye were recruited. The biometric parameters of both the eyes were measured by A-scan ultrasonic biometry and ultrasound biomicroscopy. Comparisons of visual function, baseline intraocular pressure (IOP), and the biometric measurements were made. Forty-one patients were recruited. Eyes with CPACG had worse visual function, higher baseline IOP, and larger cup-to-disc ratio than their fellow eyes with PAC/PACS (P<0.001). Eyes with CPACG had shallower anterior chamber depths, smaller anterior chamber angles, thinner irises, and longer iris-ciliary process distances than their fellow eyes with PAC/PACS (P<0.05). There were no significant differences in terms of lens thicknesses, axial lengths, lens vault, and trabecular-ciliary process distances. Lens thickness, lens location, and axial length do not appear to play a significant role in the progression from PAC/PACS to CPACG. A thin and anterior iris bowing may be related to the progression from PAC/PACS to CPACG.
    Journal of glaucoma 06/2013; · 1.74 Impact Factor
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    ABSTRACT: We isolated human epidermis-derived mesenchymal stem cell-like pluripotent cells (hEMSCPCs) and demonstrate efficient harvesting, maintenance in vitro for at least 30 passages, reprogramming into multiple phenotypes in vivo, and integration into adult host tissues after injection into the mouse blastocyst to create chimeras. Cell phenotype was examined by karyotyping, immunostaining, immunofluorescence, and flow cytometry. A nested PCR protocol using primers specific for human SRY genes was designed to detect hEMSCPC-derived cells in female chimeric mice. FISH was used to validate the results of nested PCR. Results indicated that hEMSCPCs were derived from epidermis but were distinct from epidermal cells; they resembled mesenchymal stem cells (MSCs) morphologically and expressed the main markers of MSCs. About half of all female offspring of mice implanted with embryos injected with hEMSCPCs at the blastocyst stage harbored the human Y chromosome and tissue-specific human protein, thereby demonstrating the transdifferentiation of hEMSCPCs.
    Scientific Reports 06/2013; 3:1933. · 2.93 Impact Factor
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    ABSTRACT: Retinoblastoma is a childhood ocular tumor caused by the inactivation of both alleles of the retinoblastoma gene (Rb1). Without Rb1 gene function, chromosomal aberrations are observed in retinoblastoma cells. The instability of the genome is closely associated with the repair of DNA double-strand breaks (DSBs). However, the precise molecular mechanism of action of Rb1 in DNA DSB repair remains unclear. Thus, in this study, we aimed to investigate whether the Rb1 gene affects DNA stability by assaying DNA DSB repair and also whether it regulates the proliferation of retinoblastoma cells. Rb1 immunofluorescence and RT-PCR were performed, demonstrating that the Rb1 gene is silenced in SO-Rb50 retinoblastoma cells, and the karyotype analysis of SO-Rb50 cells indicated that the loss of Rb1 function led to genomic instability; both numerical and structural chromosomal aberrations were observed in our study. In addition, the DNA DSB repair efficiency of the SO-Rb50 cells was measured by γ-H2AX immunofluorescence, a commonly used in situ marker of DNA DSBs, following exposure to ionizing radiation (IR) (2.5 and 5.0 Gy). We found that the DNA repair efficiency was significantly increased following IR-induced damage (P<0.01). However, there was no significant difference in DNA repair efficiency between the cells expressing exogenous Rb1 and the control (P>0.05). The assay for the screening of the effect of Rb1 on the sub-pathway of DNA DSB repair, non-homologous end joining (NHEJ) and homologous recombination (HR), indicated that Rb1 did not affect NHEJ activity, although it significantly promoted the HR pathway (HR levels increased by 2.46-fold) compared with the control (P<0.01). Furthermore, we found that the cell viability of the SO-Rb50 cells transfected with exogenous Rb1 was significantly inhibited (P<0.01) and cell cycle assay indicated that exogenous Rb1 induced S phase arrest (P<0.001) which also inhibited the proliferation of retinoblastoma cells (SO-Rb50) in vitro. Therefore, this study provides new insight into the mechanisms of action of the Rb1 gene in regulating the proliferation of retinoblastoma cells.
    International Journal of Molecular Medicine 05/2013; · 1.96 Impact Factor
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    ABSTRACT: Mitochondrial dysfunction contributing to the pathogenesis of glaucomatous neurodegeneration has stimulated considerable interest recently. In this study, we explored the role of peroxisome proliferator activated receptor-γ co-activator 1α (PGC-1α) in resveratrol-triggered mitochondrial biogenesis for preventing apoptosis in a retinal ganglion cell line RGC-5. Our results showed that serum deprivation induced cell apoptosis in a time-dependent manner. Applying resveratrol maintained the normal mitochondrial membrane potential, decreased the levels of both total and cleaved caspase-3, and inhibited the release of cytochrome c, which subsequently enhanced cell survival. Moreover, resveratrol stimulated mitochondrial biogenesis by increasing the absolute quantity of mitochondria as well as their DNA copies. Treatment with resveratrol promoted the protein expression of SIRT1, but not PGC-1α; instead, resveratrol facilitated PGC-1α translocation from the cytoplasm to the nucleus and up-regulated NRF1 and TFAM, which were blocked by nicotinamide. Collectively, we demonstrate that the SIRT1-dependent PGC-1α subcellular translocation following resveratrol application potentially attenuates serum deprivation-elicited RGC-5 cell death, thereby raising the possibility of mitigating glaucomatous retinopathy by enhancement of mitochondrial biogenesis.
    Apoptosis 03/2013; · 4.07 Impact Factor
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    ABSTRACT: The survival in patients with malignant gliomas still remains limited and novel treatment strategies are urgently needed. Tetramethylpyrazine (TMP) extracted from the Chinese herb Chuanxiong, has been suggested to have a therapeutic potential towards Glioma primarily through its neural protection activity. However, the exact mechanisms correlating TMP's antitumor function and neural protection have not been yet elucidated. Thus, this study aimed to investigate TMP's molecular target in tumor inhibition and neural protection. The primary cultured cerebral neurocytes were treated with 100μM TMP for 14 days in vitro. We found TMP can effectively promote neurons survival, compared to controls. TMP effectively inhibits H2O2-induced rise of [Ca(2+)]i and glutamate releasing in cerebral neurocytes, compared to controls. In addition, we verify previous results that TMP significantly decreases the migration and proliferation of C6 glioma cells. Using glioma-neuronal co-culturing system, we further confirm TMP bioactivity in inhibition of glioma cells and protection of cerebral neurocytes. More importantly, our study demonstrates that the expression of chemokine receptor, CXCR4, which plays a key role in tumor development and various neurodegenerative diseases, is significantly decreased in both cerebral cerebral neurocytes and C6 glioma cells with TMP treatment, cultured alone or co-cultured. Compared with CXCR4 antagonist, AMD3100, TMP is more effective on glioma inhibition and neural protection. Glutamate concentration in medium of co-culturing system was lower after treatment with 100μM TMP. Therefore, our findings suggest that TMP-mediated suppression of C6 gliomas and neural protection involves inhibition of CXCR4 expression. Thus, this study provides new insights into TMP's therapeutic potential in the treatment of malignant gliomas.
    Cancer letters 03/2013; · 4.86 Impact Factor
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    ABSTRACT: BrdU (5-Bromo-2'-deoxyuridine) is usually used to label the mitotic cells as well as to trace reagent in cell transplation. However, BrdU could also exert some side effect on cellular biological characteristics upon inappropriate use. To explore the appropriate concentration of BrdU for labelling retinal progenitor cells (RPCs), we co-cultured Embryonic day (E) 17. 5 RPCs with different concentrations of BrdU, which were 0.2, 1, 5 and 10 micromol/L, respectively. After 48 hours, the RPCs were proliferation- or differentiation-cultured. Immunofluorescence was used to detect the BrdU-positive ratio and differentiation potential. Cell count was used to evaluate proliferation ability, and lactate dehydrogenase (LDH) release assay was used to monitor cytotoxicity. The results showed that 0.2 micromol/ L BrdU could not label RPCs clearly, while BrdU of 1, 5 or 10 micromol/L could label the RPCs with similar ratios. 1 micromol/L BrdU displayed no obvious cytotoxicity and showed no obvious effect on the proliferation and differentiation ability. However, 5 micromol/L or 10 micromol/L BrdU could evidently inhibit RPCs proliferation, partly due to the cytotoxicity effect. Furthermore, 10 micromol/L BrdU could inhibit the differentiation of RPCs towards MAP2-positive nerve cells, but showed no influence on the differentiation of RPCs towards GFAP- and glutamine synthetase positive glial cells. This study suggested that 1 micromol/L BrdU could be an appropriate concentration for RPCs labelling and could efficiently label RPCs without obvious side effect.
    Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi 02/2013; 30(1):125-30.
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    ABSTRACT: In order to investigate the feasibility of the modified chitosan-gelatin crosslinked membrane (MC-Gel) and chitosan-gelatin crosslinked membrane (CS-Gel) to be a potential biomaterial for corneal regeneration, we evaluated their physicochemical properties and intraocular biocompatibility in this study. White light transmission and permeability of these membranes were detected. Results showed that white light transmission of both membranes was above 90% at 500 nm, which was similar to that of human cornea. The glucose, tryptophan and NaCl permeability of MC-Gel membrane and CS-Gel membrane was better than or similar to those of human cornea. The methylthiazol tetrazolium (MTT) assay was used to assess cell viability and proliferation. Also, interlamellar corneal transplantation was carried out to evaluate ophthalmic biocompatibility of MC-Gel membrane and CS-Gel membrane. Results indicated that MC-Gel membranes could support the proliferation of HCEC and displayed good intraocular biocompatibility when implanted into rabbits. No severe inflammatory reaction occurred after transplantation and the implanted MC-Gel membrane degraded completely 16 weeks post-operation. Due to its good physicochemical properties and biocompatibility, MC-Gel membrane could be a promising candidate material for corneal regeneration.
    Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi 02/2013; 30(1):170-5.
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    ABSTRACT: OBJECTIVE: To study the clinical characteristics and pathogenesis of malignant glaucoma in a 5-year retrospective analysis in Zhongshan Ophthalmic Center (ZOC). METHODS: Medical records of 5-year malignant glaucoma patients in Zhongshan Ophthalmic Center were reviewed retrospectively. Patients' age, gender, original disease, duration before attack, axial length and the change of depth of anterior chamber, intraocular pressure and visual acuity before and after therapy and at final follow-up were checked and analyzed. RESULTS: One hundred and eighteen cases of malignant glaucoma were hospitalized in ZOC from April 2005 to March 2010, accounts for 2.17% of PACG patients. Average age of malignant glaucoma patients was lower than that of PACG patients. The mean axial length of malignant glaucoma patients was shorter than that of Chinese population. Malignant glaucoma attacked between 1 day and 4.5 years after surgery. Ninty-three percent patients required medication and surgeries. Lens extraction and anterior vitrectomy were more effective than anterior chamber reforming combined with vitreous aspiration. The mean age of failed patient with vitreous cavity suction combined with anterior chamber angioplasty surgery was (43.7 ± 4.8) years, and was significantly younger than succeed patients, (53.7 ± 12.6) years (P < 0.05). CONCLUSIONS: Malignant glaucoma are iatrogenic and nine tenths secondary to surgeries of PACG patients. Topical application of atropine is the first choice of medication. Lens extraction combined with anterior vitrectomy has more privileges, however, is not commended especially for younger patients.
    [Zhonghua yan ke za zhi] Chinese journal of ophthalmology 02/2013; 49(2):126-129.
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    ABSTRACT: OBJECTIVE: To evaluate the efficacy and complication of glaucoma drainage implant surgery with scleral graft, scleral flap and artificial biological dural graft as the tube coverage. METHODS: Thirty-five cases (35 eyes) with refractory glaucoma who underwent FP-7 Ahmed glaucoma drainage implantation from January 2009 to June 2011 were retrospectively studied. Kaplan-Meier survival curve was applied to analyze the probability of success rate of three different tube coverage, the log-rank test used to compare the difference between tubes, and Cox proportional hazards regression analysis performed to predict the risk factors for failure. RESULTS: Conjunctival shrink back leading to exposure of tube coverage occurred in 6 eyes in artificial biological dural graft group. Intraocular pressure (IOP) elevation by encapsulated cystic blebs around the plate was seen in scleral flap group (2 eyes) and scleral graft group (1 eyes), respectively. The drainage tube exposure occurred in 1 eye in scleral graft group. Kaplan-Meier survival curve analysis showed that the success rate was 8/10, 3/9 and 14/16 in scleral graft group, artificial biological dural graft group and scleral flap group, respectively, at 12 month and 15 month. There was a significant difference among three groups (P = 0.009). The proportional hazards regression showed that artificial biological dural graft was statistically significant risk factors for failure (HR = 10.844, P = 0.015). Compared with pre-operation, the post-operative mean IOP was significantly decreased in all three groups. Postoperative IOP was not significantly different among three groups in different follow-up time point (F = 0.028 - 1.218, P > 0.05). CONCLUSIONS: Both of scleral flap group and scleral graft group are comparable in the efficacy and complication of glaucoma drainage implant surgery and have a high success rate. However, artificial biological dural graft has poor compatibility with conjunctiva resulting in severe complications, which is not recommended to be used in glaucoma drainage implant surgery.
    [Zhonghua yan ke za zhi] Chinese journal of ophthalmology 02/2013; 49(2):102-108.
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    ABSTRACT: Objet Comparaison entre la paracentèse de la chambre antérieure (PCA) et la gestion médicale standard pour un glaucome aigu à angle fermé (GAAF). (???) Nature étude prospective. Participants Des patients ayant un GAAF et une PIO de ≥ 50 mmHg ont été inscrits. Méthode Les patients ont été choisis au hasard pour recevoir la PCA et le traitement médical (groupe 1) ou le traitement médical seul (groupe 2). Résultats Il y eut 26 patients (moyenne d'âge 69,3 ± 10,4 ans, 31 yeux) dans le groupe 1 et 28 patients (moyenne d'âge 67,0 ± 9,7 ans, 30 yeux) dans le groupe 2. La PIO du groupe 1 était sensiblement inférieure 15 min, 30 min et 1 h après le traitement (P < 0,05). Puis, 1, 2 et 24 h après le traitement, l'acuité visuelle était sensiblement meilleure dans le groupe 1 que dans le groupe 2. À chaque moment prévu après le traitement, le degré d'œdème cornéen ne différait pas entre les groupes. Le degré de douleur 1 h et 2 h après le traitement était significativement plus faible dans le groupe 1 que dans le groupe 2; il n'y eut cependant pas de différence 24 h après le traitement. La période moyenne du suivi dans le groupe 1 a été de 16,1 ± 1,3 mois et celle du groupe 2, de 15,6 ± 1,4 mois (P = 0,803). Au dernier suivi, la taille de la pupille, le nombre d'yeux ayant des pupilles non réactives et les comptes des cellules endothéliales centrales n'étaient pas différentes; toutefois, l'acuité visuelle était remarquablement meilleure chez le groupe 1 (0,43 ± 0,06 log MAR vs. 0,74 ± 0,10 log MAR, P = 0,007). Conclusions La PCA est une thérapie immédiate sûre et efficace pour réduire rapidement la PIO et est associée à une meilleure acuité visuelle que le traitement médical seul.
    Canadian Journal of Ophthalmology / Journal Canadien d'Ophtalmologie. 01/2013;

Publication Stats

1k Citations
415.56 Total Impact Points

Institutions

  • 2002–2014
    • Sun Yat-Sen University
      • • State Key Laboratory of Oncology
      • • Department of Chemical Engineering
      Shengcheng, Guangdong, China
  • 2013
    • Guangdong Medical College
      Tung-kuan, Guangdong, China
  • 2011
    • Brien Holden Vision Institute
      Sydney, New South Wales, Australia
  • 2010
    • Renmin University of China
      Peping, Beijing, China
  • 2009–2010
    • University of California, Irvine
      • Department of Neurology
      Irvine, CA, United States
  • 2007–2010
    • Sun Yat-Sen University Cancer Center
      Shengcheng, Guangdong, China
    • University College London
      • Institute of Ophthalmology
      London, ENG, United Kingdom