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Expression of ephrin A family genes in mice with oxygen-induced retinal neovascularization

Chinese Journal of Ocular Fundus Diseases.2010;26(3):223-226. doi:10.3760/cma.j.issn.1005-1015.2010.03.07

Objective To investigate the role of ephrin A genes in the development of oxygen-induced retinal neovascularization (OIR) in mice. Methods The OIR model was established by oxygen induction in new born C57BL/6J mice. Reversed transcript - polymerase chain reaction (RT-PCR) was used to measure the expression levels of ephrin A1-A5 in retinas of mice in experimental and normal control group. Results All of the ephrin A family genes expressed in normal retinas. Ephrin A1 mRNA was significantly higher in OIR group (t= 3.19, P = 0. 019); ephrin A2 mRN A was higher in the 15-day-old OIR retinas (t= 3. 71,P=0. 033) ; ephrin A3-A5 mRNA decreased or disappeared in 12- and 13-day-old RNV mice, and increased in 15-day-old OIR mice. Conclusion Ephrin A genes are involved in the development of retina and OIR.

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Influence factor of the prognosis of traumatic subretinal hemorrhage after vitreo-retinal surgery

Xinxiao GAO ; Yanrong JIANG

Chinese Journal of Ocular Fundus Diseases.2010;26(3):247-250. doi:10.3760/cma.j.issn.1005-1015.2010.03.13

Objective To evaluate the influence factor of the prognosis of traumatic subretinal hemorrhage after vitreo-retinal surgery. Methods The clinical data of 50 patients with traumatic subretinal hemorrhage who had undergone vitreo-retinal surgery were retrospectively analyzed. All patients had ocular traurnatie history and subretinal hemorrhage diagnosed by fundus and B-scan examination; the preoperative visual acuity was less than 0. 1. According to different conditions, the traumatic eyes were treated with vitreo-retinal surgery, combined with lensectomy, retinotomy or silicone oil tamponade, respectively. The period of follow-up after surgery was 2-53 months, and the average period was 7.27 months. The corrected visual acuity and retinal reattachment at the last follow-up were observed. The visual acuity ≥0. 1 was the standard of good prognosis; retina[ reattachment was observed by indirect ophthalmoscope and color fundus photography. The prognostic factors mainly included type of injury, open or closed injury, the disease course, preoperative visual acuity, retinal detachment, hemorrhagic choroidal detachment, vitreous hemorrhage, the sites of submacular hemorrhage, methods of surgery. The relationships between those prognostic factors and visual acuity outcome or retinal reattachment were analyzed by χ2 test and logistic regression analysis. Results About 46.0% patients had good prognosis of the visualacuity. In the eyes with preoperative visual acuity of no light perception to hand moving and finger counting to 0. 1, the rate of good visual aeuitywas 34. 2% and 83.3%, respectively; the difference between the two groups was significant(χ2=8. 860, P = 0.003). In the eyes with or without preoperative retinal detachment, the rate of good visual acuity was 37.5% and 80. 0%, respectively; the difference between the two groups was significant (χ2=4. 232,P=0. 040). In the eyes with subretinal hemorrhage involving the macular fovea or not, the rate of good visual acuity was 34.4% and 66.7%, respectively; the difference between the two groups wassignificant (χ2 =4. 836,P=0. 028). All the other prognostic factors had no obvious effect on the retinal reattachment after the surgery. Conclusion Preoperative visual acuity, retinal detachment and submacular retinal hemorrhage were the important influence factors associated with prognostic visual acuity of eyes with traumatic subretinal hemorrhage after vitreo-retinal surgery.

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Enhancing the research on the mechanism of the occurrence and development of retinal neovascularization to prevent and treat retinal neovascularization diseases

Shibo TANG ; Ting WAN ; Xiaoyan DING

Chinese Journal of Ocular Fundus Diseases.2010;26(3):199-202. doi:10.3760/cma.j.issn.1005-1015.2010.03.01

Retinal neovascularization is a complicated pathophysiological process as a result of imbalance between angiogenic and anti-angiogenic factors. Correct understanding of the signaling pathways,exploring the critical factors involved in retinal angiogenesis, looking for new strategies by reconstructing the new vessels are helpful for knowing the mechanism of the occurrence and development of reitnal neovascularization, which would be good for preventing and treating retinal neovascularization diseases.

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Integrin α5 expression induced by epidermal growth factor affect proliferation and migration of human retinal pigment epithelium cells

Zhen CHEN ; Yiqiao XING ; Changzheng CHEN

Chinese Journal of Ocular Fundus Diseases.2010;26(3):267-270. doi:10.3760/cma.j.issn.1005-1015.2010.03.18

Objective To observe the effect of epidermal growth factor (EGF) on integrin α5 expression and its influence on human retinal pigment epithelium (RPE) cells. Methods Human RPE cells were treated in vitro with 0.1, 1.0, 10.0, 20.0 and 100.0 ng/ml of EGF, the mRNA and protein of integrin α5 was measured by reverse transcription polymerase chain reaction(RT-PCR)and flow cytometry. Human RPE cells were cultured under 4 conditions including DMEM/F12, DMEM/F12 + 10 ng/ml EGF, DMEM/F12 + 10 ng/ml EGF+ rabbit anti-human integrin α5 antibody (1: 100), DMEM/F12 + 10 ng/ml EGF+ rabbit anti-human vimentin antibody (1: 100), and their proliferation and migration were measured by methyl-thiazole tetrazolium(MTT)and Boyden chamber. Results The integrin α5 mRNA level of human RPE cells was not changed after 12 hours of EGF stimulation (F=0.618, P = 0. 687), however it was induced in a dose-dependent manner after 24 and 48 hours of EGF stimulation (F=465. 303, 212. 340; P= 0. 000, 0. 000). The protein level of integrinα5 was higher in 10 ng/ml EGF stimulation compared with the control group and 0. 1 ng/ml group (P<0. 01). MTT and Boyden chamber showed that the integrin α5 expression increased the proliferation and migration of human RPE cells. Conclusion EGF can induce integrin α5 expression, thus increase the proliferation and migration of human RPE cells.

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Expression of αA-and αB-crystallin protein in retina after blue-light exposure

Xiaoshuang JIANG ; Junjun ZHANG ; Yi LIU ; Min ZOU

Chinese Journal of Ocular Fundus Diseases.2010;26(1):66-69. doi:10.3760/cma.j.issn.1005-1015.2010.01.17

Objective To observe the expression of αA-and αB-crystallin in retina after blue-light exposure.Methods Forty female Wistar rats were divided randomly into 4 groups:control group,and blue-light exposure for 6,12,and 24 hours groups,with 10 rats in each group.The rats in the control group were not intervened.The other three groups of rats were exposed to blue fluorescent lights for 6,12,and 24 hours respcetively.Then the rats were kept in darkness for 12 hours.The globes were enucleated after anaesthesia.The immunohistochemistry and Western blot were performed to detect the expression of αA-and αB-crystallin in retina.Results The absorbance value(A value)of retina αA-crystallin was 1.40573±0.70748 in the control group,and were 4.317 51±0.412 97,7.397 08±1.947 90,9.634 32±2.377 61,respectively in the other 3 groups;the difference among the groups was significant(F=24.569,P<0.001).The A value of retina αB-crystallin is 0.129 36±0.033 93 in the control group,and were 0.507 17±0.117 55,7.345 43±2.292 97,4.042 26±3.890 23,respectively in the other 3 groups;the difference among the groups was significant(F=40.102,P<0.001).The results of Western blot showed that the expression of αA-and αB-crystallin in groups with blue-light exposure was obviously higher than that in the control group.Conclusions Blue light may up-regulate the expression of αA-and αB-crystallin in rats' retina.

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Ultrasonic microbubble combined with bevacizumab injection for choroidal neovascularization induced by phtocoagulation in rabbits

Xiao GONG ; Xiyuan ZHOU ; Zhigang WANG

Chinese Journal of Ocular Fundus Diseases.2010;26(1):19-22. doi:10.3760/cma.j.issn.1005-1015.2010.01.06

Objective To observe the therapeutic effect of ultrasonic microbubble combined with bevacizumab (Avastin) on choroidal neovascularization induced by photocoagulation in rabbits.Methods CNV was induced by photocoagulation with argon laser in 30 rabbits (60 eyes).All of the rabbits underwent fundus fluorecein angiography (FFA) 21 days after photocoagulation;6-8 hours later,3 rabbits were randomly chosen to be executed to having the immunohistochemical examination.Twenty-one days after photocoagulation,27 rabbits were divided randomly into 3 groups:bevacizumb,ultrasonic microbubble+bevacizumb,and control group;each group has 9 rabbits (18 eyes).The rabbits in control group had no interference treatment;while the rats in bevacizumb and ultrasonic microbubble+bevacizumb group underwent injection with bevacizumb or ultrasonic microbubble+bevacizumb respectively.FFA was performed on all of the rabbits 7,14,and 28 days after photocoagulation to observe the inhibition of CNV;immunofluorecence and Western blot were used to detect the expression of VEGF in retina and choroid.Twenty-eight days is the time point to determine the therapeutic efficacy.The expression of VEGF and the results of FFA were the sdandards of the judgement of therapeutic efficacy.Results Proliferaion of CNV to the retinal inner layer and the obvious leakage of fluoresein in the photocoagulation area indicated that the model of CNV was set up successfully.Twenty-eight days after injection,obvious fluorescent leakage was found in the control group,and the average fluorescent leakage in bevacizumab group differed much from the control group(t=16.2952,P<0.05);while the difference between ultrasonic microbubble+bevacizumb group and bevacizumab group was also significant (t=4.7955,P<0.05).At the same time point,the expression of VEGF in bevacizumab group detected by immunofluorecent assay and Western blot differed much from the control group (t=7.0327,9.2596;P<0.05),and the difference of VEGF between ultrasonic microbubble+bevacizumb group and bevacizumab group was significant (t=2.9724,17.1937;P<0.05).this experiment show that ultrasound combined bevacizumab intravitreal injection of the therapeutic effect of CNV superior to other groups(P<0.01).Conclusion Ultrasound microbubble combined with bevacizumab injection may improve the therapeutic effect on CNV by inhibiting the expression of VEGF.

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Standardization of laser treatment for diabetic retinopathy and other ocular fundus diseases

Xiaoling LIU ; Xinquan SUN

Chinese Journal of Ocular Fundus Diseases.2010;26(2):101-104. doi:10.3760/cma.j.issn.1005-1015.2010.02.01

Pan-retinal photocoagulation (PRP) and macular photocoagulation (MPC) are the gold standard treatments for proliferative diabetic retinopathy (DR) and diabetic macular edema. With the development of equipment and technology advancement, photocoagulation has been gradually applied in many Eye Centers all over China. However, there are still several problems such as no standardized guideline and undesirable therapeutic effects. In this article we will summarize the indications and techniques of photocoagulation, and when and how to apply drug treatments for retinal diseases; aim at improving the criterion and clinical effects of photocoagulation.

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Expression of opticin in the eyes of diabetic mice

Ying CHEN ; Jin MA ; Tiepei ZHU

Chinese Journal of Ocular Fundus Diseases.2010;26(2):143-146. doi:10.3760/cma.j.issn.1005-1015.2010.02.12

Objective To observe the opticin expression in the eyes of non-obese diabetes (NOD) mice and non-diabetic NOD mice . Methods Twenty NOD mice were divided into diabetic group (experimental group) and non-diabetic group (control group). All the mice were killed by cervical dislocation method. The eyes were harvested, and the vitreous, retina and sclera were separately collected. Western blot and real-time reverse transcription-polymerase chain reaction(RT-PCR)were respectively used to determine opticin protein and OPTC-mRNA levels. Results The opticin protein level in the vitreous and retina was lower in the experimental group(t = 4.42,4.58; P = 0. 002,0. 002), but is same in the sclera between the 2 groups (t = 0. 27, P = 0. 794). OPTC-mRNA level was vitreous> retina> selera. OPTC-mRNA levels of vitreous and retina in diabetic group were significantly Iower(t = 3.30,2. 48; P= 0. 01, 0.04); there was no statistical significant on OPTC mRNA of sclera between two groups(t = 0. 27, P = 0. 80). Conclusion Expression of opticin was suppressed in retina and vitreous of diabetic mice.

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Pay attention to the potential risks of anti-vascular endothelial growth factor therapy for neovascular disease

Maonian ZHANG

Chinese Journal of Ocular Fundus Diseases.2010;26(1):2-5. doi:10.3760/cma.j.issn.1005-1015.2010.01.01

Anti-vascular dndothelial growth factor (VEGF) drugs have open up a new treatment channel for ocular neovascular diseases.A lots of clinical data has proved that anti VEGF drugs are effective and safe.But we should also notice that long-term and excessive usage of anti-VEGF drugs brings some new problems and complications,and even affect the normal ocular physiological process of the angiogenesis and retinal blood flow.So,it is necessary to pay attention to the problems and potential risks of excessive usage of anti VEGF therapies for ocular neovascular disease.

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Clinical characteristics and therapeutic effect of retinal detachment in aphakic and pseudophakic eyes in 805 patients

Haidong ZOU ; Xi ZHANG ; Xun XU

Chinese Journal of Ocular Fundus Diseases.2010;26(1):47-51. doi:10.3760/cma.j.issn.1015-1005.2010.01.12

Objective To observe the clinical characteristics and therapeutic effect of aphakic retinal detachment (ARD) eyes and pseudophakic retinal detachment (PPRD) eyes.Methods The clinical data of 805 patients,including 321 ARD and 484 PPRD eyes were retrospectively analyzed.The patients'visiual acuity,refraction,intraocular pressure were examined,and the patients also underwent slit-lamp microscopy and direct and (or) indirect ophthalmoscopy.The preoperative best-corrected visual acuity (BCVA) was between light perception (LP) and 0.6.Mainly according to the PVR grade and retinal holes position to take the scleral buckling or vitrectomy combined with scleral buckling.The 805 eyes were divided into 1995-1999 group (243 eyes) and 2000-2007 group (562 eyes) according to operative time.The follow-up ranged from 3 to 25 months,with an average of 12.3 months.The success standard of surgery was set as anatomic retinal reattachment and the last follow-up time was considered as the judgment time.The surgical complications were recorded at each follow-up time points.The composition of PPRD,the visual acuity,ocular lesions,surgical methods and results before operation and visual acuity after operation in two groups were analyzed and compared by Mantel-Haenszel chi-square test.Results The average interval from lens extraction to RD occurrence was 15.4 months in PPRD eyes and 39.1 months in ARD eyes.The final total anatomic success rate was 95.9%,and was 93.5% in the scleral buckle eyes and 97.2% in vitrectomy eyes.The BCVA was better than 0.3 after operation only in 11.9% of the 805 patiens,and the visual acuity increased more than 2 lines in 67.3%.Compared with the ARD eyes,early onset,high proportion of total posterior vitreous detachment,severe PVR,wide RD range,low detection rate of retinal hole and low antomic success rate were found in PPRD eyes.Compared with the 1995-1999 group,the proportion of vitreous surgery,anatomic success rate and better visual acuity were found in 2000-2007 group.Conclusions The ocular lesions of ARD and PPRD is more complicated,the therapeutic effect are improving in recent years.

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