Publications by authors named "Yu-ping Zou"

7 Publications

  • Page 1 of 1

Protective effects of lipoic acid-niacin dimers against blue light-induced oxidative damage to retinal pigment epithelium cells.

Int J Ophthalmol 2019 18;12(8):1262-1271. Epub 2019 Aug 18.

Department of Ophthalmology, General Hospital of Southern Theatre Command of PLA, Guangzhou 510010, Guangdong Province, China.

Aim: To evaluate the protective effects of lipoic acid-niacin (N2L) dimers against blue light (BL)-induced oxidative damage to human retinal pigment epithelium (hRPE) cells

Methods: hRPE cells were divided into a control group (CG), a BL group, an N2L plus BL irradiation group, an α-lipoic acid (ALA) plus BL group, an ALA-only group, and an N2L-only group. hRPE cellular viability was detected by performing 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium (MTT) bromide assays, and apoptosis was evaluated by annexin-V-PE/7-AAD staining followed by flow cytometry. Ultrastructural changes in subcellular organelles were observed by transmission electron microscopy. Reactive oxygen species formation was assayed by flow cytometry. The expression levels of the apoptosis-related proteins BCL-2 associated X protein (BAX), B-cell leukmia/lymphoma 2 (BCL-2), and caspase-3 were quantified by Western blot analysis.

Results: BL exposure with a light density of 4±0.5 mW/cm exceeding 6h caused hRPE toxicity, whereas treatment with a high dose of N2L (100 mol/L) or ALA (150 mol/L) maintained cell viability at control levels. BL exposure caused vacuole-like degeneration, mitochondrial swelling, and reduced microvillus formation; however, a high dose of N2L or ALA maintained the ultrastructure of hRPE cells and their organelles. High doses of N2L and ALA also protected hRPE cells from BL-induced apoptosis, which was confirmed by Western blot analysis: BCL-2 expression significantly increased, while BAX and caspase-3 expression slightly decreased compared to the CG.

Conclusion: High-dose N2L treatment (>100 mol/L) can reduce oxidative damage in degenerating hRPE cells exposed to BL with an efficacy similar to ALA.
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http://dx.doi.org/10.18240/ijo.2019.08.05DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6694045PMC
August 2019

Protection of tight junction between RPE cells with tissue factor targeting peptide.

Int J Ophthalmol 2018 18;11(10):1594-1599. Epub 2018 Oct 18.

General Surgery, Aviation General Hospital, Beijing 100012, China.

Aim: To investigate the effect of tissue factor targeting peptide (TF-TP) on retinal pigment epithelium (RPE) cells tight junctions.

Methods: Cell counting kit-8 (CCK-8) was used to measure the proliferation of ARPE-19 cells. Expression of tight junction, ZO-1 in ARPE-19 cells was measured by Western blot and immunofluorescent staining. Western blot was also used to detect the expression of tissue factor (TF). CEC Transmigration Assay was used to measure the migration of ARPE-19 cells. The transport of fluorescent markers [fluorescein isothiocyanate dextrans of 4, 10, 20 (FD4, FD10, FD20)] and the transepithelial electrical resistance (TEER) were used to measure in ARPE-19 cell.

Results: CCK-8 assay showed that 5 µmol/L TF-TP can inhibit ARPE-19 cells abnormally proliferation stimulated by lipopolysaccharide (LPS; <0.05). LPS increased the transport of fluorescent markers (FD4, FD10, FD20) and decreased TEER levels in ARPE-19 cells, respectively, which were prevented by 5 µmol/L TF-TP pretreatment (<0.05). Furthermore, LPS significantly up-regulated the expression of TF and downregulated the expression of ZO-1 (<0.05) in ARPE-19 cell which was inhibited by the TF-TP (<0.05). In addition, TF-TP inhibited the abnormal migration induced by LPS in ARPE-19 cell (<0.05).

Conclusion: Our findings suggest that TF-TP suppressed proliferation and migration of ARPE-19 cells induced by LPS, and maintained the RPE tight junctions through inhibition of TF expression and increased expression of ZO-1.
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http://dx.doi.org/10.18240/ijo.2018.10.04DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6192970PMC
October 2018

Endoscopy-assisted vitrectomy in the anterior vitreous.

Int J Ophthalmol 2018 18;11(3):506-511. Epub 2018 Mar 18.

Department of Ophthalmology, Guangzhou General Hospital of Guangzhou Military Command of PLA, Guangzhou 510000, Guangdong Province, China.

Endoscopy-assisted ocular surgery is a relatively old technique that is increasingly being recognized for its application in cases of vitreoretinal disease. This technique is especially useful when both the vitreous and retina are difficult to access because of media opacity, a small pupil, or a microcornea. In this context, the anterior vitreous is often difficult to dissect because of its complex pathological changes. This article reviews the common anatomical features and pathologies that are observed in the anterior vitreous, as well as the applications and indications of endoscopy-assisted vitrectomy in the anterior vitreous.
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http://dx.doi.org/10.18240/ijo.2018.03.23DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5861243PMC
March 2018

[Association between hepatocyte growth factor in tears and corneal haze in rabbits early after epipolis laser in situ keratomileusis].

Nan Fang Yi Ke Da Xue Xue Bao 2017 Nov;37(11):1551-1554

Department of Ophthalmology, Guangzhou General Hospital of Guangzhou Command, Guangzhou 510010, China. E-mail:

Objective: To study the dynamic changes of levels of hepatocyte growth factor (HGF) in tears and their association with corneal haze in rabbits early after epipolis laser in situ keratomileusis (Epi-LASIK).

Methods: Twenty-four New Zealand rabbits received Epi-LASIK with an ablation depth of 100 µm in one eye and of 150 µm in the other eye. Before and at 3, 7, 14, and 30 days after the surgery, the level of HGF in tears collected from the rabbits was measured using enzyme-linked immunosorbent assay (ELISA), and corneal haze was graded after surgery.

Results: In all the rabbits, corneal epithelium healing occurred in 3 to 5 days after Epi-LASIK. Corneal haze appeared 3 days postoperatively in the rabbits accompanied by increased levels of HGF in tears. At 3, 7, 14, and 30 days after the surgery, the rabbits with an ablation depth of 150 µm showed more obvious corneal haze (P<0.05) and significantly higher levels of HGF in tears than those with an ablation depth of 100 µm (P<0.05).

Conclusion: In rabbits receiving Epi-LASIK, HGF levels in tears and the grade of corneal haze show a positive correlation early after the surgery and are both related with the depth of ablation.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6779644PMC
November 2017

Endoscope-assisted goniosynechialysis combined with phacoemulsification and intraocular lens implantation to manage primary angle-closure glaucoma.

Int J Ophthalmol 2013 18;6(2):174-7. Epub 2013 Apr 18.

Department of Ophthalmology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou 510010, Guangdong Province, China.

Aim: To describe and evaluate a new ophthalmic endoscope surgical technique combined with phacoemulsification and intraocular lens (IOL) implantation to treat goniosynechialysis and manage primary angle-closure glaucoma (PACG).

Methods: Endoscope-assisted goniosynechialysis combined with phacoemulsification and IOL implantation was performed in 32 eyes of 29 patients with PACG. Regular follow-up was performed 1 week and 1 month, 3, and 6 months after surgery to assess complications, intraocular pressure (IOP), anterior chamber depth, visual acuity, and anterior chamber angle.

Results: Preoperative mean IOP was 24.88±7.22mmHg with pharmacological treatment, and was 13.70±4.02, 13.06±3.74, 14.29±4.70, and 14.33±5.01mmHg 1 week, 1 month, 3 months, and 6 months after surgery, respectively. The postoperative decrease in IOP was significant (P<0.05). The rate for all eyes with IOP of 21mmHg or less was 93.8% (30 eyes) at the final visit without ocular hypotensive agents. The average preoperative anterior chamber depth was 1.60±0.64mm, and this value significantly increased to 2.72±0.62, 2.76±0.70, 2.73±0.68, and 2.74±0.71mm at 1 week, 1 month, 3 months, and 6 months, respectively. Visual acuity was improved in 28 eyes (87.5%) at 6 months postoperatively. The anterior chamber angle had increased in 25 eyes (78.1%) at the final visit; it was adhesive 90°-180° in 6 eyes, 180°-270° in only 1 eye. Two eyes exhibited minimal hyphema in the early postoperative period, but it could gradually be absorbed. Fibrinous reaction was observed in five eyes and spontaneously disappeared within 7 days. No shallow anterior chamber, iridodialysis, choroidal detachment, or malignant glaucoma was found in any eyes.

Conclusion: Endoscope-assisted goniosynechialysis combined with phacoemulsification and IOL implantation to manage PACG has several advantages, including optimized visualization, greater accuracy, and improved safety. Our results suggest that it has certain curative effects and clinical application value.
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http://dx.doi.org/10.3980/j.issn.2222-3959.2013.02.13DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3633756PMC
May 2013

[The adjustable, folding and multi-function mount].

Zhongguo Yi Liao Qi Xie Za Zhi 2002 Nov;26(6):449, 468

The People's Hospital of Luzhou City, Sichuan Province.

An adjustable folding mount is presented in this paper. It is a multi-functional device for one or more patient's infusions, continuous traction and functional training, and life nursing etc.
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November 2002

[The preliminary study of photolysis for cataract surgery].

Zhonghua Yan Ke Za Zhi 2003 Oct;39(10):601-4

Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China.

Objective: To evaluate the safety and efficiency of Dodick-ARC photolysis machine (a kind of Nd:YAG laser system) in the using of cataract surgery.

Methods: 52 eyes of cataract (fifty-two patients) were undergone photolysis with Dodick-ARC laser system and foldable intraocular lenses (IOLs) implantation. The hardness of nuclei was graded as N(1.0) to N(4.0) of LOCS III classification system. Before and after operations, the intraocular conditions, visual acuity, corneal thickness and operative complications were recorded. The time of follow-ups was more than 6 months.

Results: The operations were accomplished in 28 eyes and were changed into Phacoemulsification in 24 eyes. Posterior capsule rupture occurred in 2 cases (3.8%). Severe corneal edema was found in 3 cases (5.8%) that disappeared in 1 to 2 weeks. Preoperative visual acuity was < 0.05 in 19 cases, 0.05 - 0.3 in 28 cases and 0.4 - 0.5 in 5 cases. Postoperative visual acuity was < or = 0.3 in 1 case, 0.4 - 0.5 in 12 cases, 0.6 - 0.9 in 25 cases and > or = 1.0 in 14 cases. The mean values of pachymetry was 0.59 mm preoperatively and 0.60 mm in 3 months postoperatively (P = 0.097).

Conclusion: Photolysis using Dodick-ARC Nd:YAG laser system is a safe and effective method for cataract surgery. The further improvement of equipment and surgery techniques is needed.
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October 2003
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