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Qiu X, Zhang S, Zhang Y, Cai L, Li D, Lu Y. Reduction of ETV1 is Identified as a Prominent Feature of Age-Related Cataract. Curr Eye Res 2024; 49:496-504. [PMID: 38200696 DOI: 10.1080/02713683.2024.2302545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Accepted: 01/01/2024] [Indexed: 01/12/2024]
Abstract
PURPOSE To identify the inactive genes in cataract lenses and explore their function in lens epithelial cells (LECs). METHODS Lens epithelium samples obtained from both age-related cataract (ARC) patients and normal donors were subjected to two forms of histone H3 immunoprecipitation: H3K9ac and H3K27me3 chromatin immunoprecipitation (ChIP), followed by ChIP-seq. The intersection set of "active genes in normal controls" and "repressed genes in cataract lenses" was identified. To validate the role of a specific gene, ETV1, within this set, quantitative polymerase chain reaction (qPCR), western blot, and immunofluorescence were performed using clinical lens epithelium samples. Small interference RNA (siRNA) was utilized to reduce the mRNA level of ETV1 in cultured LECs. Following this, transwell assay and western blot was performed to examine the migration ability of the cells. Furthermore, RNA-seq analysis was conducted on both cell samples with ETV1 knockdown and control cells. Additionally, the expression level of ETV1 in LECs was examined using qPCR under H2O2 treatment. RESULTS Six genes were identified in the intersection set of "active genes in normal controls" and "repressed genes in ARC lenses". Among these genes, ETV1 showed the most significant fold-change decrease in the cataract samples compared to the control samples. After ETV1 knockdown by siRNA in cultured LECs, reduced cell migration was observed, along with a decrease in the expression of β-Catenin and Vimentin, two specific genes associated with cell migration. In addition, under the oxidative stress induced by H2O2 treatment, the expression level of ETV1 in LECs significantly decreased. CONCLUSIONS Based on the findings of this study, it can be concluded that ETV1 is significantly reduced in human ARC lenses. The repression of ETV1 in ARC lenses appears to contribute to the disrupted differentiation of lens epithelium, which is likely caused by the inhibition of both cell differentiation and migration processes.
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Affiliation(s)
- Xiaodi Qiu
- Eye Institute, Eye & ENT Hospital of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
- NHC Key Laboratory of Myopia, Fudan University, Shanghai, China
- Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
| | - Shaohua Zhang
- Eye Institute, Eye & ENT Hospital of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
- NHC Key Laboratory of Myopia, Fudan University, Shanghai, China
- Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
| | - Youmeng Zhang
- Department of Stomatology, Eye & ENT Hospital of Fudan University, Shanghai, China
| | - Lei Cai
- Eye Institute, Eye & ENT Hospital of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
- NHC Key Laboratory of Myopia, Fudan University, Shanghai, China
- Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
| | - Dan Li
- Eye Institute, Eye & ENT Hospital of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
- NHC Key Laboratory of Myopia, Fudan University, Shanghai, China
- Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
| | - Yi Lu
- Eye Institute, Eye & ENT Hospital of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
- NHC Key Laboratory of Myopia, Fudan University, Shanghai, China
- Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
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Fang R, Li HL, Lv NX, Yue PL, Jia YX, Liu ZC, Zhou HG, Song XD. Inhibition of miR-29a-3p Alleviates Apoptosis of Lens Epithelial Cells via Upregulation of CAND1. Curr Eye Res 2024; 49:391-400. [PMID: 38095165 DOI: 10.1080/02713683.2023.2293457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Accepted: 12/05/2023] [Indexed: 03/23/2024]
Abstract
PURPOSE Accumulated evidence has shown that microRNAs (miRNAs) are closely related to the pathogenesis and progression of senile cataracts. Here we investigate the effect of miR-29a-3p in cataractogenesis and determined the potential molecular mechanism involved. METHODS In this study, we constructed a selenite cataract model in rats and obtained the miRNAs related to cataracts by whole transcriptome sequencing. To investigate the effect and mechanism of miR-29a-3p on cataracts, we performed several in vivo and in vitro experiments, including CCK8 assay, flow cytometry, luciferase reporter assay, Edu assay, and western blot analysis. RESULT Sequencing data showed downregulation of miR-29a-3p in rats with selenite cataracts. Down-regulation of miR-29a-3p could promote lens epithelial cells (SRA01/04) proliferation and inhibit cell apoptosis, and miR-29a-3p silence could inhibit the development of cataracts. Additionally, CAND1 was a direct target gene for miR-29a-3p. CONCLUSION These data demonstrate that miR-29a-3p inhibits apoptosis of lens epithelial cells by regulating CAND1, which may be a potential target for senile cataracts.
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Affiliation(s)
- Rui Fang
- Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Hai-Long Li
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Key Laboratory of Molecular Drug Research, Nankai University, Tianjin, China
| | - Ning-Xin Lv
- Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Pei-Lin Yue
- Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Yu-Xuan Jia
- Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Zhao-Chuan Liu
- Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Tongren Eye Center, Beijing, China
- Beijing Ophthalmology&Visual Sciences Key Lab, Beijing, China
| | - Hong-Gang Zhou
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Key Laboratory of Molecular Drug Research, Nankai University, Tianjin, China
| | - Xu-Dong Song
- Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Tongren Eye Center, Beijing, China
- Beijing Ophthalmology&Visual Sciences Key Lab, Beijing, China
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Wang P, Gao L, Ma T, Ye Z, Li Z. MicroRNA-1225-5p Promotes the Development of Fibrotic Cataracts via Keap1/Nrf2 Signaling. Curr Eye Res 2024:1-14. [PMID: 38450708 DOI: 10.1080/02713683.2024.2316712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 02/03/2024] [Indexed: 03/08/2024]
Abstract
PURPOSE Fibrotic cataracts, including anterior subcapsular cataract (ASC) as well as posterior capsule opacification (PCO), are a common vision-threatening cause worldwide. Still, little is known about the underlying mechanisms. Here, we demonstrate a miRNA-based pathway regulating the pathological fibrosis process of lens epithelium. METHODS Gain- and loss-of-function approaches, as well as multiple fibrosis models of the lens, were applied to validate the crucial role of two miR-1225 family members in the TGF-β2 induced PCO model of human LECs and injury-induced ASC model in mice. RESULTS Both miR-1225-3p and miR-1225-5p prominently stimulate the migration and EMT process of lens epithelial cells (LECs) in vitro as well as lens fibrosis in vivo. Moreover, we demonstrated that the underlying mechanism for these effects of miR-1225-5p is via directly targeting Keap1 to regulate Keap1/Nrf2 signaling. In addition, evidence showed that Keap1/Nrf2 signaling is activated in the TGF-β2 induced PCO model of human LECs and injury-induced ASC model in mice, and inhibition of the Nrf2 pathway can significantly reverse the process of LECs EMT as well as lens fibrosis. CONCLUSIONS These results suggest that blockade of miR-1225-5p prevents lens fibrosis via targeting Keap1 thereby inhibiting Nrf2 activation. The 'miR-1225-Keap1-Nrf2' signaling axis presumably holds therapeutic promise in the treatment of fibrotic cataracts.
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Affiliation(s)
- Peihong Wang
- Medical School of Chinese PLA, Beijing, China
- Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
| | - Lixiong Gao
- Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
| | - Tianju Ma
- Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
| | - Zi Ye
- Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
| | - Zhaohui Li
- Medical School of Chinese PLA, Beijing, China
- Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
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Lee E, Kim HA, Seo K, Kang S. Hyperproliferation of Elschnig pearl-type posterior capsule opacification and spontaneous regression in two pseudophakic canine eyes. Vet Ophthalmol 2024; 27:170-176. [PMID: 38071419 DOI: 10.1111/vop.13173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 11/21/2023] [Accepted: 11/29/2023] [Indexed: 03/18/2024]
Abstract
OBJECTIVE To describe the hyperproliferation of Elschnig pearl-type posterior capsule opacification and concurrent uveitis in two canine eyes after phacoemulsification, followed by spontaneous resolution of the Elschnig pearls. ANIMAL STUDIED A 10-year-old castrated male Spitz (Case 1) and a 4-year-old spayed female Bichon Frise (Case 2). PROCEDURE Elschnig pearls proliferating beyond the anterior capsulotomy site were observed in the right eye 10 months after bilateral diabetic cataract surgery (Case 1) and 7 months after unilateral cataract surgery (Case 2). In both cases, hyperproliferation occurred where the anterior capsule did not overlap with the intraocular lens (IOL), and was accompanied by aqueous flare. In Case 1, the pearls extended from the anterior capsule and adhered to the iris, causing focal posterior synechia. No other possible causes of uveitis were apparent. RESULTS Initially, uveitis severity improved after the administration of topical and systemic anti-inflammatory drugs. However, uveitis recurred when the dosage of anti-inflammatory treatment was reduced. The Elschnig pearls underwent morphological changes throughout the follow-up period. In both cases, the pearls beyond the anterior capsulotomy resolved spontaneously after 5 months. Only a few pearls remained between the IOL and posterior capsule, and no recurrence of pearl proliferation was observed at the last follow-up. CONCLUSIONS To the best of our knowledge, this is the first report of spontaneous Elschnig pearl regression in dogs. Lens-induced uveitis (LIU) may have been caused by anterior chamber hyperproliferative pearls. LIU associated with hyperproliferative pearls may be managed with appropriate anti-inflammatory treatment and monitoring.
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Affiliation(s)
- Eunji Lee
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, Korea
| | | | - Kangmoon Seo
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, Korea
| | - Seonmi Kang
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, Korea
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Wang JD, Zhang JS, Li XX, Wang KJ, Li M, Mao YY, Wan XH. Knockout of TGF-β receptor II by CRISPR/Cas9 delays mesenchymal transition of Lens epithelium and posterior capsule opacification. Int J Biol Macromol 2024; 259:129290. [PMID: 38199534 DOI: 10.1016/j.ijbiomac.2024.129290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 12/16/2023] [Accepted: 01/04/2024] [Indexed: 01/12/2024]
Abstract
Posterior capsule opacification (PCO) is the most common postoperative complication of cataract surgery. Transforming growth factor-β (TGF-β) is related to epithelial-mesenchymal transition (EMT) of lens epithelial cells (LECs) that is proven to induce PCO formation in clinical and experimental studies. In this study, CRISPR sequences targeting exon of TGF-βRII were knocked out with lentiviral transfection in LECs. Rabbits' PCO model was established and recombinant adeno-associated virus (AAV) for transferring the gRNA of TGF βRII were intravitreally injected. SgRNA inhibited TGF-βRII expression and human LECs proliferation. In TGF-βRII knockout group, LECs motility and migration were suppressed, N-cadherin and vimentin expressions were significantly decreased, whereas E-cadherin was increased. The animal model showed that TGF-βRII knockout in vivo was effective in suppressing PCO. The current study suggested that the CRISPR/Cas9 endonuclease system could suppress TGF-βRII secretion, which participates in the EMT procedure of LECs in vitro and PCO in vivo. These findings might provide a new gene-editing approach and insight into a novel therapeutic strategy for PCO.
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Affiliation(s)
- Jin Da Wang
- Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Jing Shang Zhang
- Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Xiao Xia Li
- Department of Ophthalmology, Beijing Shijitan Hospital of Capital Medical University, Beijing 100038, China
| | - Kai Jie Wang
- Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Meng Li
- Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China
| | - Ying Yan Mao
- Beijing Tongren Hospital, Beijing Institute of Ophthalmology, Capital Medical University, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - Xiu Hua Wan
- Beijing Tongren Hospital, Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing 100730, China.
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Ma P, Huang J, Chen B, Huang M, Xiong L, Chen J, Huang S, Liu Y. Lanosterol Synthase Prevents EMT During Lens Epithelial Fibrosis Via Regulating SREBP1. Invest Ophthalmol Vis Sci 2023; 64:12. [PMID: 38079167 PMCID: PMC10715316 DOI: 10.1167/iovs.64.15.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 10/25/2023] [Indexed: 12/18/2023] Open
Abstract
Purpose Epithelial-mesenchymal transition (EMT) of lens epithelial cells (LECs) is a predominant pathological process underlying fibrotic cataracts. Here we investigated the role and mechanism of lanosterol synthase (LSS), a key rate-limiting enzyme in sterol biosynthesis, in EMT of LECs. Methods Human lens epithelial explants, primary rabbit LECs, and whole rat lenses were treated with TGFβ2. RNA-sequencing was conducted to explore genetic changes during fibrosis of human lens epithelial explants. Loss- and gain-of-function studies were performed in primary LECs to investigate roles and mechanisms of LSS, lanosterol and sterol regulatory element binding transcription protein 1 (SREBP1) in EMT. Rat lenses were applied to evaluate the potential effect of lanosterol on lens fibrosis. Expression of LSS, SREBP1, EMT-related regulators, and markers were analyzed by Western blot, qRT-PCR, or immunofluorescent staining. Results LSS and steroid biosynthesis were downregulated in TGFβ2-induced lens fibrosis. LSS inhibition directly triggered EMT by inducing Smad2/3 phosphorylation and nucleus translocation, an overexpression of LSS protected LECs from EMT by inhibiting Smad2/3 activation. Moreover, LSS inhibition decreased the expression of SREBP1, which regulated EMT via intervening TGFβ2/Smad2/3 transduction. Furthermore, lanosterol protected LECs from EMT caused by both TGFβ2 treatment and LSS inhibition via suppressing Smad2/3 activation and maintained lens transparency by preventing fibrotic plaques formation. Conclusions We first identified that LSS protected LECs from EMT and played an antifibrotic role to maintain lens transparency. Additionally, lanosterol and sterol biosynthesis regulation might be promising strategies for preventing and treating fibrotic cataracts.
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Affiliation(s)
- Pengjuan Ma
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Jingqi Huang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Baoxin Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Mi Huang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Lang Xiong
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Jieping Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Shan Huang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Yizhi Liu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
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Zhou Y, Chen W, Zhang Y, Lin ZL, Li J, Chen H, Chen WR. Transient vacuolar changes of the crystalline lens in patients using a dispersive ophthalmic viscosurgical device. Int J Ophthalmol 2023; 16:1794-1799. [PMID: 38028514 PMCID: PMC10626355 DOI: 10.18240/ijo.2023.11.09] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 08/31/2023] [Indexed: 12/01/2023] Open
Abstract
AIM To report the clinical prognosis and pathological findings of accidental lens vacuolar changes in eyes with intraoperative exposure to a dispersive ophthalmic viscosurgical device (OVD). METHODS Two patients who developed transient lens vacuolar changes during uneventful persistent pupillary membrane (PPM) removal surgery were presented and followed up. This event was speculated to be associated with an intraoperative dispersive OVD DisCoVisc (hyaluronic acid 1.6%-chondroitin sulfate 4.0%) exposure. Then, to provide the pathological basis for our speculation, another four cataract patients were randomly exposed to different OVDs, and their anterior lens capsules were investigated with transmission electron microscopy (TEM). RESULTS After months, the subcapsular vacuoles in both PPM cases were gradually disappeared without visual deterioration. For the cataract patients, similar lens changes were observed intraoperatively in those exposed to a dispersive DisCoVisc but not a cohesive OVD IVIZ (sodium hyaluronate gel 1.0%). In addition, marked ultrastructural changes, including chromatin condensation, extensive cytoplasmic vacuoles, and obvious intercellular space between lens epithelial cells in the anterior lens capsules of all eyes exposed to DisCoVisc, were observed by TEM. CONCLUSION The lens vacuolar changes may be associated with a dispersive OVD exposure. Therefore, it is not preferable to use dispersive OVDs in patients with transparent lenses or without the intention of lens extraction. In addition, close follow-ups instead of immediate lens extraction are recommended for the occurrence of similar lens lesions.
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Affiliation(s)
- Yue Zhou
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou 510060, Guangdong Province, China
| | - Wan Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou 510060, Guangdong Province, China
| | - Yu Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou 510060, Guangdong Province, China
| | - Zhuo-Ling Lin
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou 510060, Guangdong Province, China
| | - Jing Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou 510060, Guangdong Province, China
| | - Hui Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou 510060, Guangdong Province, China
| | - Wei-Rong Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou 510060, Guangdong Province, China
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Sorkou KN, Theotokis P, Deftereou TE, Maria L, Meditskou S, Manthou ME. Detecting Apoptotic Human Lens Epithelial Cells With Transmission Electron Microscopy. Cureus 2023; 15:e45916. [PMID: 37885524 PMCID: PMC10599265 DOI: 10.7759/cureus.45916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2023] [Indexed: 10/28/2023] Open
Abstract
Introduction Cataract formation is a prevalent issue worldwide, and understanding the cellular processes involved is crucial to advancing treatment options. The scope of the study was to explore the presence of apoptotic cells in the lens epithelium of Greek patients with senile cataracts using transmission electron microscopy (TEM). Methods Twenty-one patients with senile cataracts were included in this cross-sectional study, and their anterior lens capsules were thoroughly examined. The presence of apoptosis was ultrastructurally investigated, and its association with age, gender, biomicroscopic type of cataract, the coexistence of exfoliation syndrome (XFS), diabetes mellitus, and glaucoma was statistically correlated. Results We detected apoptotic cells in nine of the 21 patients. Morphological features indicative of apoptosis in the nuclei included degradation, nuclear membrane irregularity, reduction of nuclear volume, condensation, and margination of chromatin. The cytoplasm either appeared denser or contained vacuoles. Budding with membrane blebbing and pinopode-like projections were frequently observed. Apoptotic cells appeared smaller, exhibiting loose connections with neighboring cells and the basement membrane (BM). Interestingly, apoptotic bodies were also detected. Conclusions None of the examined risk factors showed a connection to apoptosis, whereas neighboring lens epithelial cells (LECs) phagocytose apoptotic bodies, seemingly assumed the role of macrophages. Comparing apoptosis rates between populations with different sun exposure levels could help reveal the relationship between ultraviolet B radiation exposure, apoptosis, and cataract formation.
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Affiliation(s)
- Konstantina N Sorkou
- Department of Ophthalmology, Frimley Park Hospital, National Health Service (NHS), Camberley, GBR
- 2nd Department of Ophthalmology, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, GRC
| | - Paschalis Theotokis
- Laboratory of Histology and Embryology, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, GRC
- Laboratory of Experimental Neurology and Neuroimmunology, 2nd Department of Neurology, AHEPA University Hospital, Thessaloniki, GRC
| | | | - Lambropoulou Maria
- Laboratory of Histology and Embryology, Democritus University of Thrace, Alexandroupolis, GRC
| | - Soultana Meditskou
- Laboratory of Histology and Embryology, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, GRC
| | - Maria Eleni Manthou
- Laboratory of Histology and Embryology, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, GRC
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De Piano M, Cacciamani A, Balzamino BO, Scarinci F, Cosimi P, Cafiero C, Ripandelli G, Micera A. Biomarker Signature in Aqueous Humor Mirrors Lens Epithelial Cell Activation: New Biomolecular Aspects from Cataractogenic Myopia. Biomolecules 2023; 13:1328. [PMID: 37759728 PMCID: PMC10526747 DOI: 10.3390/biom13091328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 07/24/2023] [Accepted: 08/07/2023] [Indexed: 09/29/2023] Open
Abstract
Inflammatory, vasculogenic, and profibrogenic factors have been previously reported in vitreous (VH) and aqueous (AH) humors in myopic patients who underwent cataract surgery. In light of this, we selected some mediators for AH and anterior-capsule-bearing lens epithelial cell (AC/LEC) analysis, and AH expression was correlated with LEC activation (epithelial-mesenchymal transition and EMT differentiation) and axial length (AL) elongation. In this study, AH (97; 41M/56F) and AC/LEC samples (78; 35M/43F) were collected from 102 patients who underwent surgery, and biosamples were grouped according to AL elongation. Biomolecular analyses were carried out for AH and LECs, while microscopical analyses were restricted to whole flattened AC/LECs. The results showed increased levels of interleukin (IL)-6, IL-8, and angiopoietin-2 (ANG)-2 and decreased levels of vascular endothelium growth factor (VEGF)-A were detected in AH depending on AL elongation. LECs showed EMT differentiation as confirmed by the expression of smooth muscle actin (α-SMA) and transforming growth factor (TGF)-βR1/TGFβ isoforms. A differential expression of IL-6R/IL-6, IL-8R/IL-8, and VEGF-R1/VEGF was observed in the LECs, and this expression correlated with AL elongation. The higher VEGF-A and lower VEGF-D transcript expressions were detected in highly myopic LECs, while no significant changes were monitored for VEGF-R transcripts. In conclusion, these findings provide a strong link between the AH protein signature and the EMT phenotype. Furthermore, the low VEGF-A/ANG-2 and the high VEGF-A/VEGF-D ratios in myopic AH might suggest a specific inflammatory and profibrogenic pattern in high myopia. The highly myopic AH profile might be a potential candidate for rating anterior chamber inflammation and predicting retinal distress at the time of cataract surgery.
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Affiliation(s)
- Maria De Piano
- Research and Development Laboratory for Biochemical, Molecular and Cellular Applications in Ophthalmological Science, IRCCS-Fondazione Bietti, 00184 Rome, Italy; (M.D.P.); (B.O.B.)
| | - Andrea Cacciamani
- Surgical Retina Research Unit, IRCCS-Fondazione Bietti, 00184 Rome, Italy; (A.C.); (F.S.); (P.C.); (G.R.)
| | - Bijorn Omar Balzamino
- Research and Development Laboratory for Biochemical, Molecular and Cellular Applications in Ophthalmological Science, IRCCS-Fondazione Bietti, 00184 Rome, Italy; (M.D.P.); (B.O.B.)
| | - Fabio Scarinci
- Surgical Retina Research Unit, IRCCS-Fondazione Bietti, 00184 Rome, Italy; (A.C.); (F.S.); (P.C.); (G.R.)
| | - Pamela Cosimi
- Surgical Retina Research Unit, IRCCS-Fondazione Bietti, 00184 Rome, Italy; (A.C.); (F.S.); (P.C.); (G.R.)
| | - Concetta Cafiero
- Anatomic Pathology Unit, Fabrizio Spaziani Hospital, 03100 Frosinone, Italy;
| | - Guido Ripandelli
- Surgical Retina Research Unit, IRCCS-Fondazione Bietti, 00184 Rome, Italy; (A.C.); (F.S.); (P.C.); (G.R.)
| | - Alessandra Micera
- Research and Development Laboratory for Biochemical, Molecular and Cellular Applications in Ophthalmological Science, IRCCS-Fondazione Bietti, 00184 Rome, Italy; (M.D.P.); (B.O.B.)
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Yoo WS, Seong H, Song C, Choi MY, Lee B, Eom Y, Kim HJ, Yun SP, Kim SJ. Role of Chondroitin Sulfate Proteoglycan 5 in Steroid-Induced Cataract. Cells 2023; 12:1705. [PMID: 37443739 PMCID: PMC10340432 DOI: 10.3390/cells12131705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/21/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023] Open
Abstract
Steroid-induced cataracts (SIC) are defined as cataracts associated with the administration of corticosteroids. Long-term glucocorticoid treatment for inflammatory diseases reportedly increases the risk of SIC, and steroids can induce cataracts by disrupting ocular growth factor balance or homeostasis. In this study, we verified the effect of chondroitin sulfate proteoglycan 5 (CSPG5) using dexamethasone (dexa)-treated human lens epithelial (HLE-B3) cells and the lens epithelium from the anterior capsule of SIC patients obtained during cataract surgery. CSPG5 expression increased in the lens epithelium of SIC patients. The downregulation of CSPG5 suppressed the dexa-induced epithelial-mesenchymal transition (EMT)-related protein expression and motility in HLE-B3 cells. The disruption of the transcription factors EZH2 and B-Myb downregulated CSPG5, dexa-induced fibronectin expression, and cell migration in HLE-B3 cells, reaffirming that CSPG5 expression regulates EMT in lens epithelial cells. Taken together, these results indicate that the steroid-induced effects on lens epithelial cells are mediated via alterations in CSPG5 expression. Therefore, our study emphasizes the potential of CSPG5 as a therapeutic target for the prevention and treatment of SIC.
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Affiliation(s)
- Woong-Sun Yoo
- Department of Ophthalmology, Gyeongsang National University College of Medicine, and Gyeongsang National University Hospital, Jinju 52727, Republic of Korea
- Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju 52727, Republic of Korea
| | - Hyemin Seong
- Department of Ophthalmology, Gyeongsang National University College of Medicine, and Gyeongsang National University Hospital, Jinju 52727, Republic of Korea
- Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju 52727, Republic of Korea
| | - Chieun Song
- Department of Ophthalmology, Gyeongsang National University College of Medicine, and Gyeongsang National University Hospital, Jinju 52727, Republic of Korea
- Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju 52727, Republic of Korea
| | - Mee-Young Choi
- Department of Ophthalmology, Gyeongsang National University College of Medicine, and Gyeongsang National University Hospital, Jinju 52727, Republic of Korea
- Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju 52727, Republic of Korea
| | - Bina Lee
- Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju 52727, Republic of Korea
- Department of Pharmacology and Convergence Medical Science, Gyeongsang National University College of Medicine, Jinju 52727, Republic of Korea
| | - Youngsub Eom
- Department of Ophthalmology, Korea University College of Medicine, Seoul 02842, Republic of Korea
- Department of Ophthalmology, Korea University Ansan Hospital, Ansan 15355, Republic of Korea
| | - Hae-Jin Kim
- School of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Seung Pil Yun
- Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju 52727, Republic of Korea
- Department of Pharmacology and Convergence Medical Science, Gyeongsang National University College of Medicine, Jinju 52727, Republic of Korea
| | - Seong-Jae Kim
- Department of Ophthalmology, Gyeongsang National University College of Medicine, and Gyeongsang National University Hospital, Jinju 52727, Republic of Korea
- Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju 52727, Republic of Korea
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11
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Pernari J, Wells LA. Poly(2-hydroxyethyl methacrylate) surface chemistry and modulus differentially modulate neutrophils and lens epithelial cells-possible implications in cellular responses to intraocular lenses. J Biomed Mater Res A 2023; 111:863-878. [PMID: 36951220 DOI: 10.1002/jbm.a.37537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 03/09/2023] [Accepted: 03/11/2023] [Indexed: 03/24/2023]
Abstract
During cataract surgery, diseased lenses in the eye are surgically removed and replaced with polymeric artificial intraocular lenses (IOLs). Patients can experience a complication called posterior capsular opacification (PCO) that is corrected through the removal of part of the posterior capsule using a neodymium: yttrium-aluminum-garnet (Nd-YAG) laser to restore the optical path. These interventions have increased costs and can damage the retina and the IOL. PCO develops when lens epithelial cells (LECs) proliferate, migrate, and undergo epithelial-to-mesenchymal transition. Neutrophils involved in the immune response triggered during implantation impact LEC behavior and produce damaging neutrophil extracellular traps (NETs). In this research, poly(2-hydroxyethyl methacrylate) (PHEMA) -based disks were synthesized with varying amounts of comonomer (HEMA with 0, 2, and 12 mol% MMA) and functionalized with carboxyl and amine groups, yielding nine different hydrogels. Material and chemical properties of the disks were characterized, and neutrophil-like HL60 cells and B3 LECs were incubated with the disks. HL60 cell behavior was more strongly influenced by chemical functionalization than by mechanical properties with increases in adherence and NET accumulation. Conversely, the behavior and viability of B3 LECs were more strongly influenced by mechanical properties with increases in cell adhesion and α-SMA expression with increasing compressive moduli. Interestingly, B3 LECs had decreased viability and increased α-SMA expression when cultured on PHEMA2 disks pretreated with isolated NETs. Critical to the understanding of PCO and its prevention are both surface chemistry and mechanics as well as the inflammatory response.
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Affiliation(s)
- J Pernari
- Department of Chemical Engineering, Queen's University, Kingston, Ontario, Canada
| | - L A Wells
- Department of Chemical Engineering, Queen's University, Kingston, Ontario, Canada
- Centre for Health Innovation, Queen's University and Kingston Health Sciences Centre, Kingston, Ontario, Canada
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12
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Li J, Yu J, Huang W, Sang F, Li J, Ren Y, Huang H, Wang M, Li K, Zhang J, Li H, Cui X, Zhang J, Hu M, Yuan F, Guo W, Zhang F, Mu H, Hu Y. Extracellular HSP90 promotes differentiation of lens epithelial cells to fiber cells by activating LRP1-YAP-PROX1 axis. FASEB J 2023; 37:e22783. [PMID: 36705056 DOI: 10.1096/fj.202201187rr] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 12/20/2022] [Accepted: 01/09/2023] [Indexed: 01/28/2023]
Abstract
Capsular residual lens epithelial cells (CRLEC) undergo differentiation to fiber cells for lens regeneration or tansdifferentiation to myofibroblasts leading to posterior capsular opacification (PCO) after cataract surgery. The underlying regulatory mechanism remains unclear. Using human lens epithelial cell lines and the ex vivo cultured rat lens capsular bag model, we found that the lens epithelial cells secrete HSP90α extracellularly (eHSP90) through an autophagy-associated pathway. Administration of recombinant GST-HSP90α protein or its M-domain induces the elongation of rat CRLEC cells with concomitant upregulation of the crucial fiber cell transcriptional factor PROX1and its downstream targets, β- and γ-crystallins and structure proteins. This regulation is abolished by PROX1 siRNA. GST-HSP90α upregulates PROX1 by binding to LRP1 and activating LRP1-AKT mediated YAP degradation. The upregulation of GST-HSP90α on PROX1 expression and CRLEC cell elongation is inhibited by LRP1 and AKT inhibitors, but activated by YAP-1 inhibitor (VP). These data demonstrated that the capsular residue epithelial cells upregulate and secrete eHSP90α, which in turn drive the differentiation of lens epithelial cell to fiber cells. The recombinant HSP90α protein is a potential novel differentiation regulator during lens regeneration.
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Affiliation(s)
- Jing Li
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China.,Kaifeng Key Lab for Cataract and Myopia, Institute of Eye Disease, Kaifeng Central Hospital, Kaifeng, China
| | - Jingjing Yu
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Weikang Huang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Fan Sang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Junmin Li
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Yanzhu Ren
- Kaifeng Key Lab for Cataract and Myopia, Institute of Eye Disease, Kaifeng Central Hospital, Kaifeng, China
| | - Huili Huang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Mingli Wang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Kejia Li
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Jun Zhang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Hui Li
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Xiukun Cui
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Jing Zhang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Mengyue Hu
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Fengling Yuan
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Weikai Guo
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China
| | - Fengyan Zhang
- Department of ophthalmology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Hongmei Mu
- Kaifeng Key Lab for Cataract and Myopia, Institute of Eye Disease, Kaifeng Central Hospital, Kaifeng, China
| | - Yanzhong Hu
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital of Henan University, Henan University, Kaifeng, China.,Kaifeng Key Lab for Cataract and Myopia, Institute of Eye Disease, Kaifeng Central Hospital, Kaifeng, China.,Department of ophthalmology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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13
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Ma S, Zhu X, Li D, Yang F, Meng J, Jiang Y, Ma J, Lu Y. The Differential Expression of Circular RNAs and the Role of circAFF1 in Lens Epithelial Cells of High-Myopic Cataract. J Clin Med 2023; 12. [PMID: 36769461 DOI: 10.3390/jcm12030813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/02/2023] [Accepted: 01/18/2023] [Indexed: 01/20/2023] Open
Abstract
High-myopic cataract (HMC) is a complex cataract with earlier onset and more rapid progress than age-related cataract (ARC). Circular RNAs (circRNAs) have been implicated in many diseases. However, their involvement in HMC remain largely unexplored. To investigate the role of dysregulated circRNAs in HMC, lens epithelium samples from 24 HMC and 24 ARC patients were used for whole transcriptome sequencing. Compared with ARC, HMC had 3687 uniquely expressed circRNAs and 1163 significantly differentially expressed circRNAs (DEcRs) (|log2FC| > 1, p < 0.05). A putative circRNA-miRNA-mRNA network was constructed based on correlation analysis. We validated the differential expression of 3 DEcRs by quantitative polymerase chain reaction (qPCR) using different sets of samples. We further investigated the role of circAFF1 in cultured lens epithelial cells (LECs) and found that the overexpression of circAFF1 promoted cell proliferation, migration and inhibited apoptosis. We also showed that circAFF1 upregulated Tropomyosin 1 (TPM1) expression by sponging miR-760, which was consistent with the network prediction. Collectively, our study suggested the involvement of circRNAs in the pathogenesis of HMC and provide a resource for further study on this topic.
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14
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Li H, Gao L, Du J, Ma T, Ye Z, Li Z. Differentially expressed gene profiles and associated ceRNA network in ATG7-Deficient lens epithelial cells under oxidative stress. Front Genet 2022; 13:1088943. [PMID: 36568386 PMCID: PMC9768497 DOI: 10.3389/fgene.2022.1088943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 11/25/2022] [Indexed: 12/12/2022] Open
Abstract
Oxidation is an essential factor during cataract development. Autophagy, usually a cytoprotective process, is always found elevated in lens epithelial cells under oxidation, yet its roles and associated molecular mechanisms under such circumstances are rarely elucidated. Herein, we extracted and re-analyzed the RNA sequencing data of the GSE161701 dataset from the Gene Expression Omnibus database to identify the differentially expressed mRNAs and lncRNAs by using the R package "DESeq2". Further analyses of gene ontology and KEGG enrichment were implemented via the packages "clusterProfiler" and "enrichplot". We found that after the knockout of ATG7, differentially expressed genes were more associated with hemopoiesis, vasculature development, axonogenesis, and hypoxia regulation. When stimulated with H2O2, LECs displayed a gene expression profile correlating with apoptotic and proliferative pathways, such as the MAPK signaling pathway and FoxO signaling pathway. The differentially expressed gene profiles of the two types of LECs (wild type and ATG7 deficient) under oxidation were distinct to a large extent. Furthermore, 1,341 up-regulated and 1912 down-regulated differential mRNAs and 263 up-regulated and 336 down-regulated differential lncRNAs between these two types of LECs subjected to H2O2 were detected, among which 292 mRNAs and 24 lncRNAs possibly interacted with ten cataract-related miRNAs. A competing endogenous lncRNA-miRNA-mRNA network based on such interactions was finally constructed.
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Affiliation(s)
- Hongyu Li
- Medical School of Chinese PLA, Beijing, China,Senior Department of Ophthalmology, The Third Medical Center of PLA General Hospital, Beijing, China
| | - Lixiong Gao
- Senior Department of Ophthalmology, The Third Medical Center of PLA General Hospital, Beijing, China
| | - Jinlin Du
- Senior Department of Ophthalmology, The Third Medical Center of PLA General Hospital, Beijing, China
| | - Tianju Ma
- Senior Department of Ophthalmology, The Third Medical Center of PLA General Hospital, Beijing, China
| | - Zi Ye
- Senior Department of Ophthalmology, The Third Medical Center of PLA General Hospital, Beijing, China,*Correspondence: Zi Ye, ; Zhaohui Li,
| | - Zhaohui Li
- Medical School of Chinese PLA, Beijing, China,Senior Department of Ophthalmology, The Third Medical Center of PLA General Hospital, Beijing, China,*Correspondence: Zi Ye, ; Zhaohui Li,
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15
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Lin X, Yang T, Liu X, Fan F, Zhou X, Li H, Luo Y. TGF-β/Smad Signalling Activation by HTRA1 Regulates the Function of Human Lens Epithelial Cells and Its Mechanism in Posterior Subcapsular Congenital Cataract. Int J Mol Sci 2022; 23:ijms232214431. [PMID: 36430917 PMCID: PMC9692351 DOI: 10.3390/ijms232214431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 11/16/2022] [Accepted: 11/17/2022] [Indexed: 11/22/2022] Open
Abstract
Congenital cataract is the leading cause of blindness among children worldwide. Patients with posterior subcapsular congenital cataract (PSC) in the central visual axis can result in worsening vision and stimulus deprivation amblyopia. However, the pathogenesis of PSC remains unclear. This study aims to explore the functional regulation and mechanism of HTRA1 in human lens epithelial cells (HLECs). HTRA1 was significantly downregulated in the lens capsules of children with PSC compared to normal controls. HTRA1 is a suppression factor of transforming growth factor-β (TGF-β) signalling pathway, which plays a key role in cataract formation. The results showed that the TGF-β/Smad signalling pathway was activated in the lens tissue of PSC. The effect of HTRA1 on cell proliferation, migration and apoptosis was measured in HLECs. In primary HLECs, the downregulation of HTRA1 can promote the proliferation and migration of HLECs by activating the TGF-β/Smad signalling pathway and can significantly upregulate the TGF-β/Smad downstream target genes FN1 and α-SMA. HTRA1 was also knocked out in the eyes of C57BL/6J mice via adeno-associated virus-mediated RNA interference. The results showed that HTRA1 knockout can significantly upregulate p-Smad2/3 and activate the TGF-β/Smad signalling pathway, resulting in abnormal proliferation and irregular arrangement of lens epithelial cells and leading to the occurrence of subcapsular cataract. To conclude, HTRA1 was significantly downregulated in children with PSC, and the downregulation of HTRA1 enhanced the proliferation and migration of HLECs by activating the TGF-β/Smad signalling pathway, which led to the occurrence of PSC.
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Affiliation(s)
- Xiaolei Lin
- Department of Ophthalmology, Shanghai Eye Disease Prevention and Treatment Center, Shanghai Eye Hospital, Shanghai 200040, China;
- Department of Ophthalmology, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China; (T.Y.); (X.L.); (F.F.); (X.Z.); (H.L.)
| | - Tianke Yang
- Department of Ophthalmology, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China; (T.Y.); (X.L.); (F.F.); (X.Z.); (H.L.)
| | - Xin Liu
- Department of Ophthalmology, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China; (T.Y.); (X.L.); (F.F.); (X.Z.); (H.L.)
| | - Fan Fan
- Department of Ophthalmology, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China; (T.Y.); (X.L.); (F.F.); (X.Z.); (H.L.)
| | - Xiyue Zhou
- Department of Ophthalmology, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China; (T.Y.); (X.L.); (F.F.); (X.Z.); (H.L.)
| | - Hongzhe Li
- Department of Ophthalmology, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China; (T.Y.); (X.L.); (F.F.); (X.Z.); (H.L.)
| | - Yi Luo
- Department of Ophthalmology, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China; (T.Y.); (X.L.); (F.F.); (X.Z.); (H.L.)
- Correspondence: ; Tel.: +86-(0)21-64377134
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16
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Ma B, Ni N, Shao W, Xu J, Ji J, Luo M. Bit1 is involved in regulation between integrin and TGFβ signaling in lens epithelial cells. Cell Cycle 2022; 21:2283-2297. [PMID: 35737738 PMCID: PMC9586669 DOI: 10.1080/15384101.2022.2092818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 04/03/2022] [Accepted: 06/16/2022] [Indexed: 11/03/2022] Open
Abstract
Bit1, as an integrin-specific effector, is specifically expressed in lens epithelial cells (LECs) and may be essential to maintain the normal function of LECs. The present study investigated the function of Bit1 and its regulatory mechanism in LECs. Knockdown of Bit1 was mediated by a lentivirus with a specific short-hairpin RNA against Bit1 in SRA01/04 cells. Cell proliferation ability was measured by CCK-8 assay. Cell migration was examined by transwell and wound-healing assays. The effect of Bit1 knockdown on genome-wide expression patterns was studied via a GeneChip® PrimeView™ Human Gene Expression Array. Based on the ingenuity pathway analysis (IPA), Bit1's regulation of target pathways and genes was verified by real-time qPCR and Western blotting. Bit1 knockdown inhibited proliferation, migration, and regulated cell cycle and apoptosis of LECs. Microarray gene expression analysis and IPA assays revealed that integrin and TGFβ signaling pathways were remarkably impacted by Bit1 expression. FAK, PAK2, ITGA5, and ITGB1 were identified as core node molecules under the control of Bit1. Bit1 participates in integrin and TGFβ signaling via regulating downstream FAK and PAK2 and subsequently affecting EMT-related gene expression including ITGA5, ITGB1, and αSMA. In conclusion, Bit1 plays as an important role in the regulation between integrin and TGFβ signaling, which affects cell survival, migration, and EMT of LECs.
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Affiliation(s)
- Bo Ma
- Department of Ophthalmology, Shanghai Ninth People’s Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ni Ni
- Department of Ophthalmology, Shanghai Ninth People’s Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wanyu Shao
- Department of Ophthalmology, Shanghai Ninth People’s Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jingying Xu
- Department of Regenerative Medicine, Tongji University School of Medicine, Shanghai, China
| | - Jiali Ji
- Department of Ophthalmology, Shanghai Ninth People’s Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Min Luo
- Department of Ophthalmology, Shanghai Ninth People’s Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai, China
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17
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Xie Q, Xue L, Cao X, Huang L, Song Y. Apoptosis of Lens Epithelial Cells and Expression of NLRP3-related Proteins in Patients with Diabetes and Cataract. Ocul Immunol Inflamm 2022:1-8. [PMID: 35708312 DOI: 10.1080/09273948.2022.2079537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
AIM To compare the expression of apoptosis-related factors and Nlrp3-related proteins in the lens epithelial cells (LECs) of patients with diabetes and cataract and patients with age-related cataract (ARC) alone. METHODS All patients were divided into four groups according to the presence or absence of diabetes mellitus (DM) and the degree of diabetic retinopathy (DR). LECs were obtained during cataract surgery. The expression levels of cleaved caspase-3, caspase-7, ASC, caspase-1and Nlrp3 in LECs were determined. And analyzed by age, course of DM, and HbA1c levels. RESULTS The incidence of LEC apoptosis and positive rates of cleaved caspase-3 and caspase-7 expression were significantly higher in the groups with DM (P<0.05).The positive expression rates of ASC, caspase-1, and Nlrp3 increased with longer duration of DM, increased HbA1c level, or advanced DR (P<0.05). CONCLUSION In cataract patients with DM, the expression of apoptosis-related factors in LECs increased. Nlrp3-related protein expression levels, diabetes duration, HbA1c levels, and extent of DR may be potential risk factors for diabetic cataract formation.
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Affiliation(s)
- Qing Xie
- Department of Ophthalmology, The Second Affiliated Hospital of Nantong University, Nantong, China
| | - Lidan Xue
- Department of Ophthalmology, The Second Affiliated Hospital of Nantong University, Nantong, China
| | - Xin Cao
- Department of Ophthalmology, The Second Affiliated Hospital of Nantong University, Nantong, China
| | - Lili Huang
- Department of Ophthalmology, The Second Affiliated Hospital of Nantong University, Nantong, China
| | - Yu Song
- Department of Ophthalmology, The Second Affiliated Hospital of Nantong University, Nantong, China
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18
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Iwahashi CK, Kopel J, Marsh H, Reid TW. Effects of Dexamethasone on DNA Synthesis in Lens Epithelial Cells are Dependent on Cell Type and Growth Factor. Curr Eye Res 2022; 47:1009-1015. [PMID: 35260019 DOI: 10.1080/02713683.2022.2052106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
PURPOSE To determine the factors that influence the ability of dexamethasone (dex) to inhibit or stimulate the growth of lens epithelial cells. METHOD Different growth factors with or without dex (10-6 M) were added to quiescent cultures of two clones of Nakano mouse lens epithelial cells (NK11) in serum-free medium. DNA synthesis was then measured after 8 to 12 hours by the incorporation of tritiated thymidine. RESULTS Dex was found to both stimulate and inhibit mitogen-induced 3H-thymidine incorporation into the DNA of cultured mouse lens epithelial cells. Enhancement or repression by dex was found to depend on the growth factor used to stimulate the quiescent cell. EGF and insulin were consistently inhibited with dex. Basic fibroblast growth factor (bFGF) and retinoblastoma-derived growth factor (RbDGF) were both enhanced and inhibited by dex, depending on the growth factor concentration and the cell clone used for the experiment. Additionally, RbDGF protects against the dex inhibition of insulin stimulation, but not the inhibition of EGF stimulation. Progesterone, an inhibitor of the activation of the glucocorticoid receptor, blocks the dex inhibitory effect on the EGF and insulin stimulation of DNA synthesis.The ability of progesterone to affect the dex inhibition is consistent with the dex receptor modulating DNA synthesis. The dex effect on DNA synthesis, either stimulatory or inhibitory, was still seen if dex was added as late as 10 hours after the growth factor. CONCLUSIONS The study demonstrated that dex reduces the overall growth and activity of lens epithelial cells in vitro. This result provides insight into the risk of developing posterior subcapsular cataracts (PSC) in patients on oral glucocorticoid therapy. Understanding the basic mechanisms by which steroids mediate lens cell growth may provide the ability to more accurately predict who will develop PSC. The present studies show the difference in the effect of dex from lens cell to lens cell, but, more importantly, suggest a pattern of dependent variables that might prove useful in such predictions.
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Affiliation(s)
| | - Jonathan Kopel
- Texas Tech University Health Sciences Center Department of Ophthalmology and Visual Sciences, Lubbock, Texas
| | - Harrison Marsh
- Texas Tech University Health Sciences Center Department of Ophthalmology and Visual Sciences, Lubbock, Texas
| | - Ted W Reid
- Texas Tech University Health Sciences Center Department of Ophthalmology and Visual Sciences, Lubbock, Texas
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Liu J, Dong Y, Ji Q, Wen Y, Ke G, Shi L, Guan W, Xu W. Circ-MKLN1/miR-377-3p/CTGF Axis Regulates the TGF-β2-induced Posterior Capsular Opacification in SRA01/04 Cells. Curr Eye Res 2021; 47:372-381. [PMID: 34961410 DOI: 10.1080/02713683.2021.1988983] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVE Posterior capsular opacification (PCO) is a common postoperative ocular complication after cataract surgery. Little research focused on the regulation of circular RNAs (circRNAs) in PCO. This study was designed to investigate the function of circRNA-muskelin (circ-MKLN1) in PCO. METHODS SRA01/04 cells were treated with transforming growth factor (TGF)-β2. Cell viability was analyzed by Cell Counting Kit-8 (CCK-8) assay. Transwell assay was used for cell migration and invasion detection. Cell migration was also measured by wound healing assay. Epithelial-mesenchymal transition (EMT)-related proteins and connective tissue growth factor (CTGF) were quantified using western blot. RESULTS Cell viability, migration, invasion and EMT process in SRA01/04 cells were facilitated by TGF-β2. Circ-MKLN1 expression was enhanced in 17 PCO lens samples relative to 19 normal lens samples and TGF-β2-treated SRA01/04 cells contrasted to control cells. Downregulation of circ-MKLN1 inhibited the effects of TGF-β2 on SRA01/04 cells. Circ-MKLN1 targeted miR-377-3p and the regulation of si-circ-MKLN1 for the TGF-β2-induced influences was related to the upregulation of miR-377-3p. CTGF was the target gene for miR-377-3p. CTGF knockdown also abolished the TGF-β2-mediated cell growth, migration and invasion of SRA01/04 cells. The function of miR-377-3p was achieved by reducing the CTGF level. TGF-β2-induced CTGF expression promotion was alleviated by si-circ-MKLN1 through upregulating the expression of miR-377-3p. CONCLUSION These results showed that circ-MKLN1 contributed to the progression of PCO in vitro by increasing the CTGF expression via sponging miR-377-3p. Circ-MKLN1 might be important for improving the molecular target therapy in PCO.
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Affiliation(s)
- Jiajia Liu
- The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei City, Anhui, 230001, China.,Department of Ophthalmology, The First Affiliated Hospital of USTC, Hefei, Anhui, China.,Anhui Provincial Key Laboratory of Tumor Immunotherapy and Nutrition Therapy, Hefei, China.,Gerontology Institute of Anhui Province, Hefei, Anhui, China
| | - Yiran Dong
- Department of Ophthalmology, The First Affiliated Hospital of USTC, Hefei, Anhui, China
| | - Qingshan Ji
- The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei City, Anhui, 230001, China.,Department of Ophthalmology, The First Affiliated Hospital of USTC, Hefei, Anhui, China.,Anhui Provincial Key Laboratory of Tumor Immunotherapy and Nutrition Therapy, Hefei, China
| | - Yuechun Wen
- Department of Ophthalmology, The First Affiliated Hospital of USTC, Hefei, Anhui, China
| | - Genjie Ke
- Department of Ophthalmology, The First Affiliated Hospital of USTC, Hefei, Anhui, China
| | - Lei Shi
- Department of Ophthalmology, The First Affiliated Hospital of USTC, Hefei, Anhui, China
| | - Wei Guan
- Department of Ophthalmology, The First Affiliated Hospital of USTC, Hefei, Anhui, China
| | - Weiping Xu
- The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei City, Anhui, 230001, China.,Anhui Provincial Key Laboratory of Tumor Immunotherapy and Nutrition Therapy, Hefei, China.,Gerontology Institute of Anhui Province, Hefei, Anhui, China
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20
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Andjelic S, Drašlar K, Hvala A, Hawlina M. Structural Characteristics of the Lens in Presenile Cataract. Front Med (Lausanne) 2021; 8:802275. [PMID: 35004779 PMCID: PMC8727346 DOI: 10.3389/fmed.2021.802275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 11/23/2021] [Indexed: 11/13/2022] Open
Abstract
The purpose of this work is to examine the structure of the anterior lens epithelial cells (aLECs) of presenile idiopathic cortical cataract to investigate the possible structural reasons for its development. The anterior lens capsules (aLCs: basement membrane and associated lens epithelial cells) were obtained from routine uneventful cataract surgery of 5 presenile cataract patients (16 and 41 years old women and 29, 39, and 45 years old men). None of the patients had family history of cataract, medication, or trauma and they were otherwise healthy. In addition, the patients did not have any other abnormal features in the ocular status except cataract. The aLCs were prepared for scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The most prominent abnormal features observed by SEM for all 5 studied presenile cataract patients were the changes of the aLECs structure with the dents, the selective concavity of some LECs, at their apical side centrally toward the nucleus. In addition, TEM showed the thinning of the lens epithelium with the segmentally concave cells and the compressed and elongated nuclei. Abnormal and distinguishable structural features were observed in the anterior lens epithelium aLECs in all 5 patients with presenile cataract. Disturbed structure of aLECs, regularly present in presenile cataract type is shown that might be associated with water accumulation in the presenile idiopathic cortical cataract lens.
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Affiliation(s)
- Sofija Andjelic
- Eye Hospital, University Medical Centre, Ljubljana, Slovenia
| | - Kazimir Drašlar
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Anastazija Hvala
- Department of Pathology, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Marko Hawlina
- Eye Hospital, University Medical Centre, Ljubljana, Slovenia
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21
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Lin X, Li H, Yang T, Liu X, Fan F, Zhou X, Luo Y. Transcriptomics Analysis of Lens from Patients with Posterior Subcapsular Congenital Cataract. Genes (Basel) 2021; 12:1904. [PMID: 34946854 PMCID: PMC8702110 DOI: 10.3390/genes12121904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/19/2021] [Accepted: 11/26/2021] [Indexed: 01/30/2023] Open
Abstract
To gain insight into the aetiology of posterior subcapsular congenital cataract from the perspective of transcriptional changes, we conducted an mRNA sequencing analysis of the lenses in posterior subcapsular congenital cataract patients and in normal children. There were 1533 differentially expressed genes from 19,072 genes in the lens epithelial cells of the posterior subcapsular congenital cataract patients compared to in the normal controls at a cut-off criteria of |log2 fold change| of >1 and a p-value of <0.05, including 847 downregulated genes and 686 upregulated genes. To further narrow down the DEGs, we utilised the stricter criteria of |log2 fold change| of >1 and an FDR value of <0.05, and we identified 551 DEGs, including 97 upregulated genes and 454 downregulated genes. This study also identified 1263 differentially expressed genes of the 18,755 genes in lens cortex and nuclear fibres, including 646 downregulated genes and 617 upregulated genes. The downregulated genes in epithelial cells were significantly enriched in the structural constituent of lenses, lens development and lens fibre cell differentiation. After filtering the DEGs using the databases iSyTE and Cat-Map, several high-priority candidate genes related to posterior subcapsular congenital cataract such as GRIFIN, HTRA1 and DAPL1 were identified. The findings of our study may provide a deeper understanding of the mechanisms of posterior subcapsular congenital cataract and help in the prevention and treatment of this disease.
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Affiliation(s)
| | | | | | | | | | | | - Yi Luo
- Department of Ophthalmology, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China; (X.L.); (H.L.); (T.Y.); (X.L.); (F.F.); (X.Z.)
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22
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Wang C, Zhao R, Zhang S. lncRNA XIST knockdown suppresses cell proliferation and promotes apoptosis in diabetic cataracts through the miR‑34a/SMAD2 axis. Mol Med Rep 2021; 25:7. [PMID: 34751414 PMCID: PMC8600409 DOI: 10.3892/mmr.2021.12523] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 07/22/2021] [Indexed: 11/06/2022] Open
Abstract
According to emerging evidence, long non-coding RNAs (lncRNAs) play critical roles in diabetes. The aim of the present study was to investigate the role and mechanism of X-inactive specific transcript (XIST) in cell proliferation, migration and apoptosis in diabetic cataracts (DC). SRA01/04 lens epithelial cells were treated with high glucose (HG). The levels of XIST, microRNA (miR)-34a and SMAD family member 2 (SMAD2) were examined via reverse transcription-quantitative PCR. MTT, Transwell, wound healing and TUNEL assays were performed to examine cell proliferation, invasion, migration and apoptosis, respectively. The interaction between miR-34a and XIST or SMAD2 was verified by luciferase reporter assay. It was found that the expression of XIST was increased and that of miR-34a was decreased in DC tissues and HG-treated SRA01/04 cells. XIST knockdown or miR-34a overexpression attenuated cell proliferation and migration, and induced apoptosis in HG-treated SRA01/04 cells. XIST targeted miR-34a and regulated DC progression through miR-34a. SMAD2 was identified as a target gene of miR-34a and was positively modulated by XIST. XIST knockdown inhibited cell proliferation and migration, and accelerated apoptosis in HG-stimulated SRA01/04 cells, and these effects were abrogated by SMAD2 overexpression. In conclusion, XIST promoted cell proliferation, migration and invasion, and inhibited apoptosis, through the miR-34a/SMAD2 axis in DC.
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Affiliation(s)
- Chao Wang
- Department of Ophthalmology, Shandong Zaozhuang Municipal Hospital, Zaozhuang, Shandong 277100, P.R. China
| | - Ruiling Zhao
- Department of Ophthalmology, Shandong Tengzhou Central People's Hospital, Zaozhuang, Shandong, 277599, P.R. China
| | - Suhong Zhang
- Department of Ophthalmology, Shandong Zaozhuang Municipal Hospital, Zaozhuang, Shandong 277100, P.R. China
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23
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Abstract
BACKGROUND Oxidative stress has been reported to be an early factor in the development of cataracts. Echinatin (Ech) is an active ingredient of licorice that exhibits antioxidant effects. OBJECTIVES To investigate the effects of Ech on oxidative stress-induced lens epithelial cell (LEC) damage. MATERIAL AND METHODS Human lens epithelial B3 cells (HLECs) were exposed to hydrogen peroxide (H2O2) and were pretreated with or without Ech. For rescue experiments, ML385, an inhibitor of the Nrf2 pathway, was added into the medium. RESULTS Echinatin reversed the H2O2-induced reduction of cell viability in B3 cells. Additionally, H2O2 induced oxidative stress, evidenced by an increase of reactive oxygen species (ROS) and malondialdehyde (MDA) levels, and a decrease in superoxide dismutase (SOD) and catalase (CAT) levels, which could be abolished by Ech. Echinatin treatment also reduced HLEC apoptosis induced by H2O2. In addition, Ech pretreatment promoted Bcl-2 expression, and suppressed Bax and caspase-3 expression levels, in H2O2-treated B3 cells. Moreover, H2O2 significantly reduced Nrf2 nuclear localization, as well as HO-1 and NQO1 expression, which could be reversed by Ech. Inhibition of Nrf2 by ML385 aggravated H2O2-induced oxidative damage and apoptosis in HLECs, and the protective effects of Ech on H2O2-induced oxidative damage and apoptosis could be restored by ML385. CONCLUSIONS Echinatin mitigates H2O2-induced oxidative damage and apoptosis in HLECs via the Nrf2/HO-1 pathway, suggesting that Ech may be a potential drug for the treatment of cataracts.
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Affiliation(s)
| | - Han Liu
- Department of Ophtalmology, Jiangjin Central Hospital of Chongqing, China
| | - Ping Wu
- Chongqing Aier Eye Hospital, China
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24
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Shen Q, Zhou T. Knockdown of lncRNA TUG1 protects lens epithelial cells from oxidative stress-induced injury by regulating miR-196a-5p expression in age-related cataracts. Exp Ther Med 2021; 22:1286. [PMID: 34630641 PMCID: PMC8461521 DOI: 10.3892/etm.2021.10721] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 06/18/2021] [Indexed: 12/11/2022] Open
Abstract
Oxidative stress plays an important role in the pathogenesis of cataracts. Under oxidative stress, apoptosis of lens epithelial cells (LECs) is activated, which may cause lens opacity and accelerate the development of cataracts. Long non-coding RNA (lncRNA) and microRNA (miRNA/miR) are involved in cataracts. Previous studies have demonstrated that lncRNA taurine upregulated 1 (TUG1) promotes cell apoptosis induced by ultraviolet radiation by downregulating the expression of miR-421. However, the mechanism underlying TUG1 in age-related cataract remains to be elucidated. The present study aimed to investigate the effect of TUG1 in age-related cataracts and to determine the related underlying molecular mechanism. In the present study, the association between TUG1 and microRNA (miR)-196a-5p was predicted using StarBase and verified using a dual luciferase reporter assay in 293 cells. The LEC line SRA01/04 was exposed to 200 µM hydrogen peroxide (H2O2) for 24 h to establish an in vitro oxidative stress model. The mRNA expression levels of TUG1 and miR-196a-5p were analyzed using reverse transcription-quantitative PCR, whilst cell viability and apoptosis were determined using MTT and flow cytometry assays, respectively. The protein expression levels of cleaved caspase-3 and caspase-3 in SRA01/04 cells were determined using western blotting. The results of the present study revealed that TUG1 directly targeted miR-196a-5p expression. In addition, the expression levels of miR-196a-5p were downregulated in SRA01/04 cells following oxidative stress, whilst TUG1 expression was upregulated. Cell transfection with TUG1-small interfering RNA (siRNA) upregulated miR-196a-5p expression levels in SRA01/04 cells, which was reversed following co-transfection with the miR-196a-5p inhibitor. Transfection with TUG1-siRNA also reduced the levels of H2O2-induced oxidative damage in SRA01/04 cells, which was demonstrated by increased cell viability, reduced levels of apoptosis and downregulated cleaved caspase-3 levels. Conversely, transfection with the miR-196a-5p inhibitor reversed these effects aforementioned. Overexpression of miR-196a-5p reduced H2O2-induced oxidative damage in SRA01/04 cells. In conclusion, findings from the present study suggested that knocking down TUG1 expression may protect LECs from oxidative stress-induced apoptosis by upregulating the expression of miR-196a-5p.
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Affiliation(s)
- Qimin Shen
- Department of Ophthalmology, People's Hospital of Yuyao, Ningbo, Zhejiang 315400, P.R. China
| | - Tian Zhou
- Department of Ophthalmology, People's Hospital of Yuyao, Ningbo, Zhejiang 315400, P.R. China
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25
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Meng K, Fang C. Knockdown of Tripartite motif-containing 22 (TRIM22)relieved the apoptosis of lens epithelial cells by suppressing the expression of TNF receptor-associated factor 6 (TRAF6). Bioengineered 2021; 12:7213-7222. [PMID: 34558381 PMCID: PMC8806417 DOI: 10.1080/21655979.2021.1980645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cataract is a disease that causes severe visual impairment in patients. Recent studies have found that lens epithelial cell apoptosis caused by oxidative damage is the critical cause of cataract. Moreover, TRIM22 could alleviate the ubiquitination of TRAF6. The expression of TRAF6 could activate the p38/MAPK pathway and aggravate the oxidative stress induced damage of lens epithelial cells. However, whether the TRIM22 could alleviate the oxidative stress induced damage of lens epithelial cells by regulating the expression of TRAF6 and p38/MAPK pathway is unclear. In this study, we stimulated the lens epithelial cells with the H2O2 and established the TRIM22 knockdown cells. Next, proliferation of these cells was determined by CCK-8 and EdU assays. Apoptosis of these cells was detected with the TUNEL assays. Levels of ROS was explored with the DCFH-DA staining. Finally, the expression levels of TRAF6, p-p38 and p-ERK were determined with the western blotting. According to the results, we found that knockdown of TRIM22 suppressed the proliferation and relieved the H2O2 induced DNA double-strand break and apoptosis of these cells. Inhibition of TRIM22 inhibited the production of ROS in these cells. Moreover, restriction of TRIM22 induced the decreased levels of TRAF6, p-p38 and p-ERK in lens epithelial cells. We concluded that inhibition of TRIM22 relieved the apoptosis of lens epithelial cells by suppressing the expression of TRAF6, p-p38 and p-ERK.
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Affiliation(s)
- Kai Meng
- Department of Ophthalmology, Fuyang Futian Eye Hospital, Fuyang, Anhui Province, China
| | - Chengbo Fang
- Department of Ophthalmology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui Province, China
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26
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Nam MH, Pantcheva MB, Rankenberg J, Nagaraj RH. Transforming growth factor-β2-mediated mesenchymal transition in lens epithelial cells is repressed in the absence of RAGE. Biochem J 2021; 478:2285-96. [PMID: 34143864 DOI: 10.1042/BCJ20210069] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 05/19/2021] [Accepted: 05/27/2021] [Indexed: 12/27/2022]
Abstract
Transforming growth factor-β2 (TGFβ2)-mediated epithelial to mesenchymal transition (EMT) in lens epithelial cells (LECs) has been implicated in fibrosis associated with secondary cataracts. In this study, we investigated whether the receptor for advanced glycation end products (RAGE) plays a role in TGFβ2-mediated EMT in LECs. Unlike in the LECs from wild-type mice, TGFβ2 failed to elicit an EMT response in LECs from RAGE knockout mice. The lack of RAGE also diminished TGFβ2-mediated Smad signaling. In addition, treatment with TGFβ2 increased IL-6 levels in LECs from wild-type mice but not in those from RAGE knockout mice. Treatment of human LECs with the RAGE inhibitor FPS-ZM1 reduced TGFβ2-mediated Smad signaling and the EMT response. Unlike that in wild-type lenses, the removal of fiber cell tissue in RAGE knockout lenses did not result in elevated levels of α-smooth muscle actin (α-SMA), fibronectin (FN), and integrin β1 in capsule-adherent LECs. Taken together, these results suggest that TGFβ2 signaling is intricately linked to RAGE. Targeting RAGE could be explored as a therapeutic strategy against secondary cataracts.
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27
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Zhu M, Cui S, Hao Z, Wang W, Yang Q, Chen C, Wang J, Zhou Q. [Curcumin induces human lens epithelial cell apoptosis and cell cycle arrest by inhibiting Wnt/β-catenin signaling pathway]. Nan Fang Yi Ke Da Xue Xue Bao 2021; 41:722-728. [PMID: 34134960 DOI: 10.12122/j.issn.1673-4254.2021.05.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVE To investigate the effect of curcumin on cell cycle and apoptosis of human lens epithelial cells and the possible molecular mechanism. OBJECTIVE Cultured human lens epithelial cell line HLEC-SRA01/04 was treated with 20, 40 and 60 μmol/L curcumin for 24 or 48 h. The cell proliferation inhibition rate was determined using MTT assay, and the changes in cell cycle, mitochondrial membrane potential and apoptosis rate were analyzed with flow cytometry. Western blotting was used to detect the expression levels of caspase-9, caspase-3, Bcl-2, Bax, cyclin B1, CDK1, β-catenin, c-myc, and cyclin D1 in the cells. OBJECTIVE Curcumin concentration- and time-dependently inhibited the proliferation of in HLEC-SRA01/04 cells as compared with the control cells (P < .05). Flow cytometric analysis showed that curcumin significantly increased apoptosis rate and cell percentage in G2/M phase and lowered mitochondrial membrane potential of HLEC-SRA01/04 cells in a concentrationdependent manner (P < 0.05). The results of Western blotting showed that curcumin also concentration-dependently increased the cellular expressions of caspase-3, caspase-9 and Bax and lowered the expressions of Bcl-2, cyclin B1, CDK1 and β-catenin along with the downstream proteins cyclin D1 and c-myc in the Wnt/β-catenin signaling pathway (P < 0.05). OBJECTIVE Curcumin inhibits the proliferation of HLEC-SRA01/04 cells possibly by inhibiting the Wnt/β-catenin signaling pathway and causing cell cycle arrest to induce cell apoptosis.
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Affiliation(s)
- M Zhu
- Department of Ophthalmology, First Affiliated Hospital of Bengbu Medical College, Bengbu 233004, China.,Anhui Provincial Key Laboratory of Translational Cancer Research, Bengbu 233030, China
| | - S Cui
- Department of Ophthalmology, First Affiliated Hospital of Bengbu Medical College, Bengbu 233004, China.,Anhui Provincial Key Laboratory of Translational Cancer Research, Bengbu 233030, China
| | - Z Hao
- Department of Ophthalmology, First Affiliated Hospital of Bengbu Medical College, Bengbu 233004, China
| | - W Wang
- Anhui Provincial Key Laboratory of Translational Cancer Research, Bengbu 233030, China
| | - Q Yang
- Anhui Provincial Key Laboratory of Translational Cancer Research, Bengbu 233030, China
| | - C Chen
- Anhui Provincial Key Laboratory of Translational Cancer Research, Bengbu 233030, China
| | - J Wang
- Department of Ophthalmology, First Affiliated Hospital of Bengbu Medical College, Bengbu 233004, China
| | - Q Zhou
- Department of Ophthalmology, First Affiliated Hospital of Bengbu Medical College, Bengbu 233004, China
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Cooksley G, Lacey J, Dymond MK, Sandeman S. Factors Affecting Posterior Capsule Opacification in the Development of Intraocular Lens Materials. Pharmaceutics 2021; 13:860. [PMID: 34200928 DOI: 10.3390/pharmaceutics13060860] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 06/03/2021] [Accepted: 06/07/2021] [Indexed: 01/01/2023] Open
Abstract
Posterior capsule opacification (PCO) is the most common complication arising from the corrective surgery used to treat cataract patients. PCO arises when lens epithelial cells (LEC) residing in the capsular bag post-surgery undergo hyper-proliferation and transdifferentiation into myofibroblasts, migrating from the posterior capsule over the visual axis of the newly implanted intraocular lens (IOL). The developmental pathways underlying PCO are yet to be fully understood and the current literature is contradictory regarding the impact of the recognised risk factors of PCO. The aim of this review is firstly to collate the known biochemical pathways that lead to PCO development, providing an up-to-date chronological overview from surgery to established PCO formation. Secondly, the risk factors of PCO are evaluated, focussing on the impact of IOLs’ properties. Finally, the latest experimental model designs used in PCO research are discussed to demonstrate the ongoing development of clinical PCO models, the efficacy of newly developed IOL technology, and potential therapeutic interventions. This review will contribute to current PCO literature by presenting an updated overview of the known developmental pathways of PCO, an evaluation of the impact of the risk factors underlying its development, and the latest experimental models used to investigate PCO. Furthermore, the review should provide developmental routes for research into the investigation of potential therapeutic interventions and improvements in IOL design in the aid of preventing PCO for new and existing patients.
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29
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Kronschläger M, Ruiß M, Dechat T, Findl O. Single high-dose peroral caffeine intake inhibits ultraviolet radiation-induced apoptosis in human lens epithelial cells in vitro. Acta Ophthalmol 2021; 99:e587-e593. [PMID: 33124749 DOI: 10.1111/aos.14641] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 09/03/2020] [Accepted: 09/06/2020] [Indexed: 11/28/2022]
Abstract
PURPOSE The aim of the present study was to determine whether caffeine concentrations in human lens epithelial cells (LECs) achieved from acute peroral caffeine intake inhibit ultraviolet radiation-induced apoptosis in vitro. METHODS Patients were planned for cataract surgery of both eyes with a caffeine abstinence of 2 weeks in total, starting 1 week before surgery of the first eye. The second eye was scheduled 1 week after the first eye. At the day of the second eye surgery, patients were given coffee containing 180 mg caffeine shortly before surgery. Lens capsules including LEC, harvested after capsulorhexis, were transferred to a cell culture dish and immediately exposed to close to threshold ultraviolet radiation (UVR). At 24 hr after UVR exposure, apoptotic LECs were analysed by TdT-mediated dUTP-biotin nick end labeling (TUNEL) staining. RESULTS TUNEL-positive cells were detected in UVR-exposed lens capsules both after caffeine intake and in controls. The mean difference in TUNEL-positive cells between caffeine intake and contralateral controls (no caffeine) resulted in a 95% CI 15.3 ± 10.4% (degrees of freedom: 16). CONCLUSION Peroral caffeine consumption significantly decreased UVR-induced apoptosis in LEC supporting epidemiological findings that caffeine delays the onset of cataract.
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Affiliation(s)
- Martin Kronschläger
- Vienna Institute for Research in Ocular Surgery Hanusch Hospital Vienna Austria
| | - Manuel Ruiß
- Vienna Institute for Research in Ocular Surgery Hanusch Hospital Vienna Austria
| | - Thomas Dechat
- Ludwig Boltzmann Institute of Osteology at Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling 1st Medical Department Hanusch Hospital Vienna Austria
| | - Oliver Findl
- Vienna Institute for Research in Ocular Surgery Hanusch Hospital Vienna Austria
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30
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Lumi X, Dučić T, Kreuzer M, Hawlina M, Andjelic S. UV Effect on Human Anterior Lens Capsule Macro-Molecular Composition Studied by Synchrotron-Based FTIR Micro-Spectroscopy. Int J Mol Sci 2021; 22:5249. [PMID: 34065666 DOI: 10.3390/ijms22105249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/11/2021] [Accepted: 05/13/2021] [Indexed: 02/07/2023] Open
Abstract
Ultraviolet (UV) irradiation is an important risk factor in cataractogenesis. Lens epithelial cells (LECs), which are a highly metabolically active part of the lens, play an important role in UV-induced cataractogenesis. The purpose of this study was to characterize cell compounds such as nucleic acids, proteins, and lipids in human UV C-irradiated anterior lens capsules (LCs) with LECs, as well as to compare them with the control, non-irradiated LCs of patients without cataract, by using synchrotron radiation-based Fourier transform infrared (SR-FTIR) micro-spectroscopy. In order to understand the effect of the UV C on the LC bio-macromolecules in a context of cataractogenesis, we used the SR-FTIR micro-spectroscopy setup installed on the beamline MIRAS at the Spanish synchrotron light source ALBA, where measurements were set to achieve a single-cell resolution with high spectral stability and high photon flux. UV C irradiation of LCs resulted in a significant effect on protein conformation with protein formation of intramolecular parallel β-sheet structure, lower phosphate and carboxyl bands in fatty acids and amino acids, and oxidative stress markers with significant increase of lipid peroxidation and diminishment of the asymmetric CH3 band.
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31
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Gosak M, Gojić D, Spasovska E, Hawlina M, Andjelic S. Cataract Progression Associated with Modifications in Calcium Signaling in Human Lens Epithelia as Studied by Mechanical Stimulation. Life (Basel) 2021; 11:life11050369. [PMID: 33919270 PMCID: PMC8143283 DOI: 10.3390/life11050369] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 04/14/2021] [Accepted: 04/19/2021] [Indexed: 12/18/2022] Open
Abstract
Ca2+ homeostasis and signaling disturbances are associated with lens pathophysiology and are involved in cataract formation. Here, we explored the spatiotemporal changes in Ca2+ signaling in lens epithelial cells (LECs) upon local mechanical stimulation, to better understand the LECs’ intercellular communication and its association with cataractogenesis. We were interested in if the progression of the cataract affects the Ca2+ signaling and if modifications of the Ca2+ homeostasis in LECs are associated with different cataract types. Experiments were done on the human postoperative anterior lens capsule (LC) preparations consisting of the monolayer of LECs on the basement membrane. Our findings revealed that the Ca2+ signal spreads radially from the stimulation point and that the amplitude of Ca2+ transients decreases with increasing distance. It is noteworthy that a comparison of signaling characteristics with respect to the degree of cataract progression revealed that, in LCs from more developed cataracts, the Ca2+ wave propagates faster and the amplitudes of Ca2+ signals are lower, while their durations are longer. No differences were identified when comparing LCs with regard to the cataract type. Moreover, experiments with Apyrase have revealed that the Ca2+ signals are not affected by ATP-dependent paracrine communication. Our results indicated that cataract progression is associated with modifications in Ca2+ signaling in LECs, suggesting the functional importance of altered Ca2+ signaling of LECs in cataractogenesis.
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Affiliation(s)
- Marko Gosak
- Faculty of Medicine, University of Maribor, 2000 Maribor, Slovenia;
- Faculty of Natural Sciences and Mathematics, University of Maribor, 2000 Maribor, Slovenia
| | - Dajana Gojić
- Eye Hospital, University Medical Centre, 1000 Ljubljana, Slovenia; (D.G.); (E.S.); (M.H.)
| | - Elena Spasovska
- Eye Hospital, University Medical Centre, 1000 Ljubljana, Slovenia; (D.G.); (E.S.); (M.H.)
| | - Marko Hawlina
- Eye Hospital, University Medical Centre, 1000 Ljubljana, Slovenia; (D.G.); (E.S.); (M.H.)
| | - Sofija Andjelic
- Eye Hospital, University Medical Centre, 1000 Ljubljana, Slovenia; (D.G.); (E.S.); (M.H.)
- Correspondence:
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Liu Y, Li S, Liu Y, Lv X, Zhou Q. MicroRNA-124 facilitates lens epithelial cell apoptosis by inhibiting SPRY2 and MMP-2. Mol Med Rep 2021; 23:381. [PMID: 33760112 PMCID: PMC7986009 DOI: 10.3892/mmr.2021.12020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 12/18/2020] [Indexed: 11/26/2022] Open
Abstract
Age-related cataract (ARC) is the primary cause of blindness worldwide. Abnormal expression of microRNAs (miRNAs/miRs) has been reported to be associated with multiple diseases, including ARC. However, the potential role of miR-124 in ARC remains unclear. The present study used the human lens epithelial cell line, SRA01/04, to investigate the potential role of miR-124 in ARC. Reverse transcription-quantitative PCR analysis was performed to detect the expression levels of miR-124, protein sprouty homolog 2 (SPRY2) and matrix metalloproteinase-2 (MMP-2) in ARC tissues, while western blotting was performed to detect the protein levels of SPRY2 and MMP-2. Cell viability and apoptosis of SRA01/04 cells were assessed via Cell Counting Kit-8 and TUNEL assays, respectively. The interaction between miR-124 and SPRY2 or MMP-2 was confirmed via the dual-luciferase reporter and RNA immunoprecipitation assays. The results of the present study demonstrated that miR-124 expression was significantly upregulated in ARC tissues, and knockdown of miR-124 increased SRA01/04 cell viability and suppressed apoptosis. In addition, SPRY2 and MMP-2 expression was decreased in ARC tissues, and were demonstrated to directly bind to miR-124. Overexpression of SPRY2 or MMP-2 increased SRA01/04 cell viability and repressed apoptosis, the effects of which were reversed following overexpression of miR-124. Taken together, these results suggested that miR-124 facilitates lens epithelial cell apoptosis by modulating SPRY2 or MMP-2 expression, providing a novel treatment approach for ARC.
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Affiliation(s)
- Yan Liu
- Department of Ophthalmology, The First People's Hospital of Changzhou, Changzhou, Jiangsu 223000, P.R. China
| | - Shuting Li
- Department of Ophthalmology, The First People's Hospital of Changzhou, Changzhou, Jiangsu 223000, P.R. China
| | - Yao Liu
- Department of Ophthalmology, The First People's Hospital of Changzhou, Changzhou, Jiangsu 223000, P.R. China
| | - Xujing Lv
- Department of Ophthalmology, The First People's Hospital of Changzhou, Changzhou, Jiangsu 223000, P.R. China
| | - Qing Zhou
- Department of Third Institute of Clinical Medicine, Soochow University, Suzhou, Jiangsu 215006, P.R. China
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Wang Y, Zhang G, Li P, Kang L, Qin B, Cao Y, Luo J, Chen X, Qin M, Guan H. Profiling and Integrated Analysis of the ERCC6-regulated circRNA-miRNA-mRNA Network in Lens Epithelial Cells. Curr Eye Res 2021; 46:1341-1352. [PMID: 33632032 DOI: 10.1080/02713683.2021.1896742] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Purpose: To explore the regulatory role of ERCC6 in the circRNA-miRNA-mRNA network using a cellular ERCC6 overexpression model (OE-ERCC6) in lens epithelial cells.Methods: The expression profiles of circRNAs, miRNAs and mRNAs were determined by RNA-seq, and a regulatory circRNA-miRNA-mRNA network was constructed via bioinformatics. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses were used for the functional annotation of circRNA host genes, differentially expressed (DE) genes, and miRNA targets.Results: The DE molecules between the OE-ERCC6 and control groups included 269 circRNAs, 241 miRNAs and 3500 mRNAs. We validated 5 selected DE reads of circRNAs (hsa_circ_0001009, hsa_circ_0002024, hsa_circ_0004592, hsa_circ_0001900 and hsa_circ_0001017). Subsequent bioinformatics analysis revealed that the DE circRNAs are mainly involved in oxidative stress- and cell death-related signaling pathways. Finally, a circRNA-miRNA-mRNA network focusing on DNA damage and cell death, which involved 5 circRNAs, 13 miRNAs and 107 mRNAs, was constructed.Conclusion: We constructed a circRNA-miRNA-mRNA network that is regulated by ERCC6. DE circRNAs have the potential to become therapeutic targets related to the lens lesions observed in ARC. The establishment of related in vivo and in vitro models could be a future direction to confirm these hypotheses.
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Affiliation(s)
- Ying Wang
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Guowei Zhang
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Pengfei Li
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Lihua Kang
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Bai Qin
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Yu Cao
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Jiawei Luo
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Xiaojuan Chen
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Miaomiao Qin
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Huaijin Guan
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
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Yao P, Jiang J, Ma X, Chen Z, Hong Y, Wu Y. miR-23a-3p regulates the proliferation and apoptosis of human lens epithelial cells by targeting Bcl-2 in an in vitro model of cataracts. Exp Ther Med 2021; 21:436. [PMID: 33777189 PMCID: PMC7967796 DOI: 10.3892/etm.2021.9853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 11/06/2020] [Indexed: 11/06/2022] Open
Abstract
Cataracts account for ~50% of the cases of blindness in individuals worldwide. The apoptosis of lens epithelial cells (LECs) occurs during the formation of cataracts, which is a non-congenital condition. Numerous microRNAs (miRs) have been reported to regulate apoptosis in LECs. For instance, miR-23a expression levels were shown to be upregulated in cataractous lenses; however, the function of miR-23a in cataracts remains undetermined. To establish an in vitro model of cataracts, human LECs, HLE-B3 cells, were induced with 200 µmol/l H2O2 for 24 h. HLE-B3 cells were transfected with the miR-negative control (NC) mimic, miR-23a-3p mimic, miR-NC inhibitor, miR-23a-3p inhibitor, small interfering RNA (siRNA) targeting BCL2 (siRNA-BCL2) and siRNA-NC. The expression levels of miR-23a-3p were detected using reverse transcription-quantitative PCR. The interaction between miR-23a-3p and the 3'-untranslated region (UTR) of the target mRNA BCL2 was predicted by TargetScan 7.1, and further validated using a dual luciferase reporter assay. The BCL2 protein expression levels were analyzed using western blotting, cell proliferation was determined using a CCK-8 assay and the levels of cell apoptosis were analyzed using flow cytometric analysis. The results of the present study revealed that the expression levels of miR-23a-3p were significantly upregulated, while the expression levels of BCL2 were significantly downregulated in H2O2-induced HLE-B3 cells compared to untreated control cells. BCL2 was shown to be a target of miR-23a-3p. The miR-23a-3p inhibitor subsequently attenuated H2O2-induced apoptosis and increased the proliferation of HLE-B3 cells, which was partially reversed by siRNA-BCL2. In conclusion, the findings of the current study suggested that the inhibition of miR-23a-3p may attenuate H2O2-induced cataract formation by targeting BCL2, thus providing a novel therapeutic target for the treatment of patients with cataracts in the clinic.
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Affiliation(s)
- Pengxiang Yao
- Department of Ophthalmology, Zhongshan Hospital Xiamen Branch, Fudan University, Xiamen, Fujian 361000, P.R. China
| | - Jian Jiang
- Department of Ophthalmology, Xiangya Hospital, Central South University, Changsha, Hunan 410000, P.R. China
| | - Xiaoping Ma
- Department of Ophthalmology, Zhongshan Hospital Xiamen Branch, Fudan University, Xiamen, Fujian 361000, P.R. China
| | - Zhenzhong Chen
- Department of Ophthalmology, Zhongshan Hospital Xiamen Branch, Fudan University, Xiamen, Fujian 361000, P.R. China
| | - Yufang Hong
- Department of Ophthalmology, Zhongshan Hospital Xiamen Branch, Fudan University, Xiamen, Fujian 361000, P.R. China
| | - Yang Wu
- Department of Ophthalmology, Zhongshan Hospital Xiamen Branch, Fudan University, Xiamen, Fujian 361000, P.R. China
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Li JW, Li YJ, Hu XS, Gong Y, Xu BB, Xu HW, Yin ZQ. Biosafety of a 3D-printed intraocular lens made of a poly(acrylamide-co-sodium acrylate) hydrogel in vitro and in vivo. Int J Ophthalmol 2020; 13:1521-1530. [PMID: 33078100 DOI: 10.18240/ijo.2020.10.03] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 07/10/2020] [Indexed: 12/26/2022] Open
Abstract
AIM To assess the biosafety of a poly(acrylamide-co-sodium acrylate) hydrogel (PAH) as a 3D-printed intraocular lens (IOL) material. METHODS The biosafety of PAH was first evaluated in vitro using human lens epithelial cells (LECs) and the ARPE19 cell line, and a cell counting kit-8 (CCK-8) assay was performed to investigate alterations in cell proliferation. A thin film of PAH and a conventional IOL were intraocularly implanted into the eyes of New Zealand white rabbits respectively, and a sham surgery served as control group. The anterior segment photographs, intraocular pressure (IOP), blood parameters and electroretinograms (ERG) were recorded. Inflammatory cytokines in the aqueous humor, such as TNFα and IL-8, were examined by ELISA. Cell apoptosis of the retina was investigated by TUNEL assay, and macroPAHge activation was detected by immunostaining. RESULTS PAH did not slow cell proliferation when cocultured with human LECs or ARPE19 cells. The implantation of a thin film of a 3D-printed IOL composed of PAH did not affect the IOP, blood parameters, ERG or optical structure in any of the three experimental groups (n=3 for each). Both TNFα and IL-8 in the aqueous humor of PAH group were transiently elevated 1wk post-operation and recovered to normal levels at 1 and 3mo post-operation. Iba1+ macroPAHges in the anterior chamber angle in PAH group were increased markedly compared to those of the control group; however, there was no significant difference compared to those in the IOL group. CONCLUSION PAH is a safe material for 3D printing of personal IOLs that hold great potential for future clinical applications.
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Affiliation(s)
- Jia-Wen Li
- Southwest Hospital/Southwest Eye Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China.,Key Lab of Visual Damage and Regeneration & Restoration of Chongqing, Chongqing 400038, China
| | - Yi-Jian Li
- Southwest Hospital/Southwest Eye Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China.,Key Lab of Visual Damage and Regeneration & Restoration of Chongqing, Chongqing 400038, China
| | - Xi-Su Hu
- Southwest Hospital/Southwest Eye Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China.,Key Lab of Visual Damage and Regeneration & Restoration of Chongqing, Chongqing 400038, China
| | - Yu Gong
- Southwest Hospital/Southwest Eye Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China.,Key Lab of Visual Damage and Regeneration & Restoration of Chongqing, Chongqing 400038, China
| | - Ben-Bin Xu
- Smart Materials and Surfaces Lab, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
| | - Hai-Wei Xu
- Southwest Hospital/Southwest Eye Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China.,Key Lab of Visual Damage and Regeneration & Restoration of Chongqing, Chongqing 400038, China
| | - Zheng-Qin Yin
- Southwest Hospital/Southwest Eye Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China.,Key Lab of Visual Damage and Regeneration & Restoration of Chongqing, Chongqing 400038, China
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Nam MH, Smith AJO, Pantcheva MB, Park KU, Brzezinski JA, Galligan JJ, Fritz K, Wormstone IM, Nagaraj RH. Aspirin inhibits TGFβ2-induced epithelial to mesenchymal transition of lens epithelial cells: selective acetylation of K56 and K122 in histone H3. Biochem J 2020; 477:75-97. [PMID: 31815277 DOI: 10.1042/BCJ20190540] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 12/04/2019] [Accepted: 12/09/2019] [Indexed: 12/12/2022]
Abstract
Posterior capsule opacification (PCO) is a complication after cataract surgery that can disrupt vision. The epithelial to mesenchymal transition (EMT) of lens epithelial cells (LECs) in response to transforming growth factor β2 (TGFβ2) has been considered an obligatory mechanism for PCO. In this study, we tested the efficacy of aspirin in inhibiting the TGFβ2-mediated EMT of human LECs, LECs in human lens capsular bags, and lensectomized mice. In human LECs, the levels of the EMT markers α-smooth muscle actin (α-SMA) and fibronectin were drastically reduced by treatment with 2 mM aspirin. Aspirin also halted the EMT response of TGFβ2 when introduced after EMT initiation. In human capsular bags, treatment with 2 mM aspirin significantly suppressed posterior capsule wrinkling and the expression α-SMA in capsule-adherent LECs. The inhibition of TGFβ2-mediated EMT in human LECs was not dependent on Smad phosphorylation or MAPK and AKT-mediated signaling. We found that aspirin significantly increased the acetylation of K56 and K122 in histone H3 of human LECs. Chromatin immunoprecipitation assays using acetyl-H3K56 or acetyl-H3K122 antibody revealed that aspirin blocked the TGFβ2-induced acetylation of H3K56 and H3K122 at the promoter regions of ACTA2 and COL1A1. After lensectomy in mice, we observed an increase in the proliferation and α-SMA expression of the capsule-adherent LECs, which was ameliorated by aspirin administration through drinking water. Taken together, our results showed that aspirin inhibits TGFβ2-mediated EMT of LECs, possibly from epigenetic down-regulation of EMT-related genes.
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Gajjar DU, Vasavada AR, Patel P, Praveen MR, Shah SR. Evaluation of collagen derived antiangiogenic factors and matrix metalloproteinases in anterior lens epithelial cells of pediatric eyes with persistent fetal vasculature. Indian J Ophthalmol 2020; 67:1618-1622. [PMID: 31546493 PMCID: PMC6786169 DOI: 10.4103/ijo.ijo_185_19] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Purpose: To measure levels of collagen-derived antiangiogenic factors (arresten, canstatin, tumstatin, endostatin) and matrix metalloproteinases (MMP-2 and MMP-9) in anterior lens epithelial cells (LECs) and anterior capsules of children with cataract and persistent fetal vasculature (PFV) as cases and cataract without PFV as controls. Methods: Anterior capsules harboring LECs were collected from pediatric cataract patients with (n = 13) and without PFV (n = 13) during surgery. Samples were immediately subjected to RNA extraction and cDNA preparation. Quantitative real time PCR was performed to determine the mRNA levels of antiangiogenic factors and matrix metalloproteinases. GAPDH (Glyceraldehyde 3-Phosphate Dehydrogenase) and β Actin were used as the housekeeping control. The mRNA levels were expressed as a ratio, using the delta-delta method for comparing the relative expression results between controls and cases. The non-parametric Mann-Whitney U test was applied for statistical evaluation. P values < 0.05 were statistically significant. Results: The relative mRNA levels of arresten, canstatin, tumstatin, endostatin, MMP-2 and MMP-9 in cases were 6.20E-03 ± 0.003, 1.49E-01 ± 0.02, 1.70E-01 ± 0.007, 3.20E-03 ± 0.003, 1.11E-03 ± 0.0009 and 3.72E-04 ± 0.0001. The mRNA levels of arresten was 1.6 times lower (P = 0.01) while mRNA levels of MMP-2, tumstatin and canstatin were 4, 2.5, and 2.3 times higher in cases than in controls. No change was observed in mRNA levels of MMP-9 and endostatin (P = 0.82). Conclusion: A significant difference in the levels of arresten, canstatin, tumstatin, and MMP-2 was found in LECs with PFV.
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Wang J, Zhang J, Xiong Y, Li J, Li X, Zhao J, Zhu G, He H, Mayinuer Y, Wan X. TGF-β regulation of microRNA miR-497-5p and ocular lens epithelial cell mesenchymal transition. Sci China Life Sci 2020; 63:1928-1937. [PMID: 32399769 DOI: 10.1007/s11427-019-1603-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 11/05/2019] [Indexed: 12/15/2022]
Abstract
The purpose of this study was to investigate the role of a human lens microRNA (miR-497-5p) in regulating epithelialmesenchymal transition (EMT) under the control of transforming growth factor beta (TGF-β). A microRNA array was used to evaluate the microRNA profiles of untreated and TGF-β-treated human lens epithelial cells in culture. This showed that TGF-β treatment led to the upregulation of 96 microRNAs and downregulation of 39 microRNAs. Thirteen microRNAs were predicted to be involved in the pathogenesis of posterior capsule opacification (PCO). Meanwhile, overexpression of miR-497-5p suppressed cell proliferation and EMT 48 h post-transfection, and inhibition of miR-497-5p accelerated cell proliferation and EMT. Treatment with TGF-β inhibited the expression of miR-497-5p, but not cell proliferation. miR-497-5p was also found to regulate the level of CCNE1 and FGF7, which are reported to be actively involved in EMT. CCNE1 and FGF7 were bona fide targets of miR-497-5p. The results suggest that miR-497-5p participates in the direct regulation of lens epithelial cell EMT and is regulated by TGF-β. miR-497-5p may be a novel target for PCO therapy.
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Affiliation(s)
- Jinda Wang
- Beijing Tongren Eye Center, Beijing Tongren Hospital of Capital Medical University; Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing Institute of Ophthalmology, Beijing, 100005, China
| | - Jingshang Zhang
- Beijing Tongren Eye Center, Beijing Tongren Hospital of Capital Medical University; Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing Institute of Ophthalmology, Beijing, 100005, China
| | - Ying Xiong
- Beijing Tongren Hospital of Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing Tongren Eye Center, Beijing, 100005, China
| | - Jing Li
- Beijing Tongren Hospital of Capital Medical University, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing Tongren Eye Center, Beijing, 100005, China
| | - Xiaoxia Li
- Beijing Tongren Eye Center, Beijing Tongren Hospital of Capital Medical University; Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing Institute of Ophthalmology, Beijing, 100005, China
| | - Jing Zhao
- Beijing Tongren Eye Center, Beijing Tongren Hospital of Capital Medical University; Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing Institute of Ophthalmology, Beijing, 100005, China
| | - Guyu Zhu
- Beijing Tongren Eye Center, Beijing Tongren Hospital of Capital Medical University; Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing Institute of Ophthalmology, Beijing, 100005, China
| | - Hailong He
- Beijing Tongren Eye Center, Beijing Tongren Hospital of Capital Medical University; Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing Institute of Ophthalmology, Beijing, 100005, China
| | - Yusufu Mayinuer
- Beijing Tongren Eye Center, Beijing Tongren Hospital of Capital Medical University; Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing Institute of Ophthalmology, Beijing, 100005, China
| | - Xiuhua Wan
- Beijing Tongren Eye Center, Beijing Tongren Hospital of Capital Medical University; Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing Institute of Ophthalmology, Beijing, 100005, China.
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Chen Y, Fan D, Zhang X, Han S, Wei X, Wang Y, Song L. MicroRNA-184 is a key molecule responsible for the transforming growth factor-β 2 -induced epithelial-mesenchymal transition in human lens epithelial-B3 cells. Clin Exp Ophthalmol 2020; 48:821-829. [PMID: 32356563 DOI: 10.1111/ceo.13774] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 04/09/2020] [Accepted: 04/16/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND TGF-β2-induced epithelial-mesenchymal transition (EMT) is an important mechanism for posterior capsule opacity (PCO) in lens epithelial cells (LECs). This study aimed to investigate if MicroRNA-184 (miR-184) plays a role in the TGF-β2-induced EMT in LECs. METHODS Human LECs (HLE-B3 cells) were used in this study. Quantitative real-time polymerase chain reaction (PCR) (qRT-PCR) was performed to analyse miR-184 expressions in HLE-B3 treated with TGF-β2 at different concentrations (0-15 ng/mL) and different time (10 ng/mL, 0-48 hours). After transfection of miR-184 mimics or miR-184 inhibitor, cells were treated with 10 ng/mL TGF-β2 for 24 hours, and the expression levels of miR-184, E-cadherin, vimentin, zinc finger E-box binding homeobox 2 (ZEB2), α-Smooth muscle actin (α-SMA), Collagen 1 and bin3 were determined by qRT-PCR and Western blot, respectively. RESULTS TGF-β2 treatment significantly downregulated E-cadherin and upregulated vimentin generally in a dose-dependent and time-dependent manner. TGF-β2 treatment significantly elevated the level of miR-184 in both dose- and time-dependent manners. In addition, transfection of miR-184 inhibitor RNA significantly attenuated TGF-β2-induced downregulation of E-cadherin as well as upregulation of vimentin, ZEB2, α-SMA and Collagen 1, whereas transfection of miR-184 mimic further enhanced the effects of TGF-β2 on the expressions of these markers. Furthermore, TGF-β2 treatment significantly downregulated bin3, and transfection of miR-184 mimic and miR-184 inhibitor significantly enhanced and attenuated the inhibition effect of TGF-β2 on bin3, respectively. CONCLUSIONS miR-184 plays a key role in the TGF-β2-induced EMT in LECs, and bin3 may be a downstream protein.
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Affiliation(s)
- Yang Chen
- Department of Ophthalmology, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, China
| | - Dongsheng Fan
- Department of Ophthalmology, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, China
| | - Xinli Zhang
- Department of Ophthalmology, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, China
| | - Shaoping Han
- Department of Ophthalmology, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, China
| | - Xiaoyue Wei
- Department of Ophthalmology, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, China
| | - Yongshu Wang
- Department of Ophthalmology, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, China
| | - Lili Song
- Department of Ophthalmology, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, China
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Hu X, Ding Y, Wang Z, Hu J, Liu X, Tang Y, Zhong M, Luan J. Expression of Neovascular Associated Factors PEDF and αB-crystallin in Human Lens Epithelial Cells. Curr Eye Res 2020; 45:1385-1389. [PMID: 32208037 DOI: 10.1080/02713683.2020.1746813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Objective: To investigate the expression of pigment epithelium-derived factor (PEDF) and αB-crystallin in human lens epithelial cells (LEC) and explore their relationships with diabetes. Methods: Lens anterior capsules attached with LEC were collected from cataract surgeries in patients with or without diabetes, and grouped as following: non-diabetes mellitus (NDM) group, no diabetic retinopathy (NDR) group, non-proliferative diabetic retinopathy (NPDR) group and proliferative diabetic retinopathy (PDR) group. The expression of PEDF and αB-crystallin in all groups was determined by Western blot and immunofluorescence assay. Results: PEDF and αB-crystallin protein were both detected in LEC. PEDF was mainly distributed in the cytoplasm, whereas αB-crystallin was present in both cytoplasm and nucleus. The levels of PEDF protein and αB-crystallin protein in LEC were significantly increased with the appearance and aggravation of diabetic retinopathy (DR) (p < .01). Conclusion: The expression of PEDF and αB-crystallin protein is both positively correlated with the progression of DR, which may contribute to the regulation of iris neovascularization.
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Affiliation(s)
- Xinying Hu
- Department of Ophthalmology, Southeast University Zhongda Hospital , Nanjing, China.,School of Medicine, Southeast University , Nanjing, China
| | - Yuzhi Ding
- Department of Ophthalmology, Southeast University Zhongda Hospital , Nanjing, China
| | - Zhirong Wang
- School of Medicine, Southeast University , Nanjing, China
| | - Juan Hu
- School of Medicine, Southeast University , Nanjing, China
| | - Xuelian Liu
- Institute of Life Sciences, Southeast University , Nanjing, China
| | - Yuyan Tang
- Institute of Life Sciences, Southeast University , Nanjing, China
| | - Ming Zhong
- School of Medicine, Southeast University , Nanjing, China
| | - Jie Luan
- Department of Ophthalmology, Southeast University Zhongda Hospital , Nanjing, China
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41
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Han X, Dong XX, Shi MY, Feng L, Wang XL, Zhang JS, Yan QC. SUMOylation and deacetylation affect NF-κB p65 activity induced by high glucose in human lens epithelial cells. Int J Ophthalmol 2019; 12:1371-1379. [PMID: 31544029 DOI: 10.18240/ijo.2019.09.01] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Accepted: 05/07/2019] [Indexed: 12/11/2022] Open
Abstract
AIM To explore the effects of IκBα SUMOylation and NF-κB p65 deacetylation on NF-κB p65 activity induced by high glucose in cultured human lens epithelial cells (HLECs). METHODS HLECs (SRA01/04) were cultured with 5.5, 25, and 50 mmol/L glucose media for 24h, and with 50 mmol/L glucose media for 0, 12, and 24h respectively. SUMO1 and SIRT1 expressions were detected by reverse transcription-polymerase chain reaction (RT-PCR) and Western blot (WB). IκBα and NF-κB p65 expressions were detected by WB. With NAC, DTT, MG132 or Resveratrol (RSV) treatment, SUMO1 and SIRT1 expressions were detected by WB. Protein expression localizations were examined by immunofluorescence and co-immunofluorescence. The effects of SUMO1 or SIRT1 overexpression, as well as MG132 and RSV, on the nuclear expression and activity of IκBα and NF-κB p65 were analyzed by immunoblot and dual luciferase reporter gene assay. RESULTS SUMO1 and SIRT1 expressions were influenced by high glucose in mRNA and protein levels, which could be blocked by NAC or DTT. SUMO1 was down-regulated by using MG132, and SIRT1 was up-regulated under RSV treatment. IκBα nuclear expression was attenuated and NF-κB p65 was opposite under high glucose, while IκBα and NF-κB p65 location was transferred to the nucleus. SUMO1 or SIRT1 overexpression and MG132 or RSV treatment affected the nuclear expression and activity of IκBα and NF-κB p65 under high glucose condition. CONCLUSION IκBα SUMOylation and NF-κB p65 deacetylation affect NF-κB p65 activity in cultured HLECs under high glucose, and presumably play a significant role in controlling diabetic cataract.
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Affiliation(s)
- Xiao Han
- Department of Ophthalmology, the Fourth Affiliated Hospital of China Medical University; Key Laboratory of Lens Research of Liaoning Province; Eye Hospital of China Medical University, Shenyang 110005, Liaoning Province, China
| | - Xiao-Xuan Dong
- Department of Ophthalmology, the Fourth People's Hospital of Shenyang, Shenyang 110031, Liaoning Province, China
| | - Ming-Yu Shi
- Department of Ophthalmology, the Fourth Affiliated Hospital of China Medical University; Key Laboratory of Lens Research of Liaoning Province; Eye Hospital of China Medical University, Shenyang 110005, Liaoning Province, China
| | - Li Feng
- Department of Ophthalmology, the Fourth Affiliated Hospital of China Medical University; Key Laboratory of Lens Research of Liaoning Province; Eye Hospital of China Medical University, Shenyang 110005, Liaoning Province, China
| | - Xin-Ling Wang
- Department of Ophthalmology, the Fourth Affiliated Hospital of China Medical University; Key Laboratory of Lens Research of Liaoning Province; Eye Hospital of China Medical University, Shenyang 110005, Liaoning Province, China
| | - Jin-Song Zhang
- Department of Ophthalmology, the Fourth Affiliated Hospital of China Medical University; Key Laboratory of Lens Research of Liaoning Province; Eye Hospital of China Medical University, Shenyang 110005, Liaoning Province, China
| | - Qi-Chang Yan
- Department of Ophthalmology, the Fourth Affiliated Hospital of China Medical University; Key Laboratory of Lens Research of Liaoning Province; Eye Hospital of China Medical University, Shenyang 110005, Liaoning Province, China
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42
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van Kooten TG, Koopmans SA, Terwee T, Langner S, Stachs O, Guthoff RF. Long-term prevention of capsular opacification after lens-refilling surgery in a rabbit model. Acta Ophthalmol 2019; 97:e860-e870. [PMID: 30900825 PMCID: PMC6766982 DOI: 10.1111/aos.14096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 03/03/2019] [Indexed: 12/21/2022]
Abstract
Purpose To reduce capsular opacification by a peri‐surgical treatment of the lens capsule with drugs in an in vivo rabbit model. Lens‐refilling surgery is a potential therapeutic intervention to treat patients with a cataract lens. The lens material is replaced with an injectable (bio)polymer that retains the natural mechanical and optical lens properties, therewith allowing accommodation. The occurrence of capsular opacification mediated by lens epithelial cells negatively affects accommodation and vision and should be avoided in this lens restoration approach. Methods An in vivo rabbit animal model was used with lens replacement with a silicone‐based gel‐like polymer and concurrent treatment of the lens epithelium with drugs. A case‐study approach was applied as both drug combinations and implantation times were varied. The following drugs were investigated for their potential to prevent capsular opacification long‐term: actinomycin D, methotrexate, paclitaxel and Tween‐20. All were administered in a hyaluronic acid vehicle. The rabbits were clinically followed for periods up to 4 years postimplantation. Eyes, corneas and lenses were analysed post‐mortem using MRI and confocal microscopy. Results Treatment combinations containing actinomycin D generally led to the least appearance of capsular fibrosis. The use of Tween‐20 or paclitaxel without actinomycin D resulted in much earlier and pronounced fibrotic responses. The aspect of capsular opacification was highly variable in individual animals. Application of the drugs in a hyaluronic acid vehicle appeared to be a safe method that spared the corneal endothelium. Conclusion The feasibility of long‐term prevention of fibrosis over a period of more than 4 years has been demonstrated in lens refilling in the rabbit model.
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Affiliation(s)
- Theo G. van Kooten
- Department of Biomedical Engineering University of Groningen University Medical Center Groningen Groningen The Netherlands
| | - Steven A. Koopmans
- Department of Ophthalmology University of Groningen University Medical Center Groningen Groningen The Netherlands
| | | | - Sönke Langner
- Institute for Diagnostic and Interventional Radiology Pediatric and Neuroradiology University Medicine Rostock Rostock Germany
| | - Oliver Stachs
- Department of Ophthalmology University of Rostock Rostock Germany
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Li D, Liu GQ, Lu PR. High glucose: activating autophagy and affecting the biological behavior of human lens epithelial cells. Int J Ophthalmol 2019; 12:1061-1066. [PMID: 31341793 DOI: 10.18240/ijo.2019.07.02] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 10/22/2018] [Indexed: 02/06/2023] Open
Abstract
AIM To clarify the effect of autophagy on human lens epithelial cells (HLECs) under high glucose conditions. METHODS HLECs were cultured with different concentrations of glucose and 3-methyladenine (3-MA); the expression of autophagy-related protein LC3B was detected by Western blotting and immunofluorescence histochemistry. The migration of HLECs was quantified by scratch wound assay and the expression of transforming growth factor-β (TGF-β) was measured by real-time polymerase chain reaction. RESULTS Compared with 5 mmol/L normal glucose treatment, 40 mmol/L glucose treatment can significantly increase the generation of autophagosome in HLECs, which could be inhibited by 0.375 mmol/L 3-MA treatment. The migration of HLECs and the expression of TGF-β in HLECs induced by high glucose were significantly suppressed by 0.375 mmol/L 3-MA treatment. CONCLUSION Autophagy promotes HLECs cell migration and increases the expression of TGF-β after exposed to high glucose, which may relate to the development of diabetic cataract.
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Affiliation(s)
- Dan Li
- Department of Ophthalmology, the First Affiliated Hospital of Soochow University, Suzhou 215006, Jiangsu Province, China
| | - Gao-Qin Liu
- Department of Ophthalmology, the First Affiliated Hospital of Soochow University, Suzhou 215006, Jiangsu Province, China
| | - Pei-Rong Lu
- Department of Ophthalmology, the First Affiliated Hospital of Soochow University, Suzhou 215006, Jiangsu Province, China
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Sorkou KΝ, Manthou ME, Meditskou S, Ziakas N, Tsaousis KT, Tsinopoulos IT. Severe Abnormalities of Lens Epithelial Cells in Exfoliation Syndrome: A Transmission Electron Microscopy Study of Patients with Age-Related Cataract. ACTA ACUST UNITED AC 2019; 55:medicina55060235. [PMID: 31159315 PMCID: PMC6631419 DOI: 10.3390/medicina55060235] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 05/18/2019] [Accepted: 05/30/2019] [Indexed: 12/25/2022]
Abstract
Background and objectives: The aim of this study was to examine via electron microscopy the lens epithelial cells in age-related cataracts and compare the findings between patients with and without exfoliation syndrome, in the Greek population. Materials and Methods: Twenty-one patients with age-related cataracts, older than 60 years, were included in the study. Eleven of them also suffered from exfoliation syndrome. Anterior lens capsules, obtained during phacoemulsification, were examined with a transmission electron microscope. Results: In all cases, ultrastructural features of diffuse intracellular and extracellular oedema were noticed to a varying degree and transparent vacuoles were detected. Often, there was more than one layer of cells, giving the impression that healthier cells tried to cover neighboring cells presenting extensive damage. Commonly, cells lost their regular shape and appeared with expanded nuclei carrying dense granules. Apoptotic cells were also detected. The epithelial cells frequently were completely destroyed or absent, exhibiting loose connections amongst them or with the basement membrane. In exfoliation syndrome (XFS) patients the alterations were more severe. Additionally, the lens epithelial cells (LECs) apical cell membrane appeared with varying distances from the basement membrane, due to different cell "heights", creating an irregular margin of the epithelium (p<0.05). Conclusion: Transmission electron microscope (TEM) examination revealed ultrastructural abnormalities in all patients' lens epithelia, more extended and more frequently observed in XFS group. In all cases, the lesions were comparable to those described in severe pathologies, all of which were excluded from the study. Environmental factors such as increased ultraviolet B (UVB) radiation exposure in Mediterranean countries, genetic factors, epigenetic factors, or all of them, could contribute to these alterations. Further epidemiological and molecular biology research is needed, so as to justify these results.
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Affiliation(s)
- Konstantina Ν. Sorkou
- Laboratory of Histology and Embryology, Medical School, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece;
- 2nd Department of Ophthalmology, Medical School, Papageorgiou Hospital, Agiou Pavlou 76, 56429, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (N.Z.); (K.T.T.); (I.T.T.)
- Correspondence: (K.N.S.); or (M.E.M.); Tel.: +30-6948467765 (K.N.S.); +30-6972296839 (M.E.M.)
| | - Maria Eleni Manthou
- Laboratory of Histology and Embryology, Medical School, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece;
- Correspondence: (K.N.S.); or (M.E.M.); Tel.: +30-6948467765 (K.N.S.); +30-6972296839 (M.E.M.)
| | - Soultana Meditskou
- Laboratory of Histology and Embryology, Medical School, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece;
| | - Nikolaos Ziakas
- 2nd Department of Ophthalmology, Medical School, Papageorgiou Hospital, Agiou Pavlou 76, 56429, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (N.Z.); (K.T.T.); (I.T.T.)
| | - Konstantinos T. Tsaousis
- 2nd Department of Ophthalmology, Medical School, Papageorgiou Hospital, Agiou Pavlou 76, 56429, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (N.Z.); (K.T.T.); (I.T.T.)
| | - Ioannis T. Tsinopoulos
- 2nd Department of Ophthalmology, Medical School, Papageorgiou Hospital, Agiou Pavlou 76, 56429, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (N.Z.); (K.T.T.); (I.T.T.)
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45
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Jiang Y, Gong Y, Lin N, Qiu W. Expression of miR-181a and TGF-β2 in lens epithelial cells of patients with cataractous retinal detachment and its clinical significance. Exp Ther Med 2019; 17:4435-4440. [PMID: 31086578 PMCID: PMC6489007 DOI: 10.3892/etm.2019.7488] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 03/21/2019] [Indexed: 12/30/2022] Open
Abstract
Expression and clinical significance of miR-181a and TGF-β2 in lens epithelial cells of patients with cataract-induced retinal detachment were investigated. Forty patients with rhegmatogenous retinal detachment combined with age-related cataract (cast-off group) and another 40 patients with simple age-related cataract (non-exfoliated group) in Tongren Hospital were enrolled between January 2017 and June 2018. Lens epithelial cells were collected, and expression levels of miR-181a and TGF-β2 mRNA in lens epithelial cells were measured by RT-qPCR. Expression of protein was detected by western blot analysis. miR-181a overexpression vector (miR-181a-mimic group) was constructed and transfected into lens epithelial cells isolated from patients with rhegmatogenous retinal detachment combined with age-related cataract. Empty vector (miR-control group) transfection was performed. Untransfected lens epithelial cells were the control group. Independent sample t-test was performed for comparison between groups. Correlation between miR-181a and TGF-β2 protein expression levels was analyzed by Pearson's correlation analysis. Relative expression level of miR-181a in the non-exfoliated group was significantly higher than that in the cast-off group (P<0.05). Relative expression levels of TGF-β2 mRNA and TGF-β2 protein in the cast-off group were significantly higher than those in the non-exfoliated group (P<0.05). Relative expression level of E-cadherin in the miR-control group was significantly lower than that in the miR-181a-mimic group (P<0.05). Relative expression level of vimentin in the miR-control group was significantly higher than that in the miR-181a-mimic group (P<0.05). Relative expression level of TGF-β2 protein in the miR-control group was significantly higher than that in the miR-181a-mimic group (P<0.05). The expression level of miR-181a was negatively correlated with the expression level of TGF-β2 protein (r= −0.875, P<0.001). miR-181a expression is decreased, while TGF-β2 expression is increased in lens epithelial cells of patients with rhegmatogenous retinal detachment combined with age-related cataract. Over-expression of miR-181a may inhibit epithelial cell epithelial-inhibition by inhibiting TGF-β2 expression. Our findings may provide guidance for future postoperative prevention and treatment of rhegmatogenous retinal detachment in cataract patients.
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Affiliation(s)
- Yanyun Jiang
- Department of Ophthalmology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200336, P.R. China
| | - Yingying Gong
- Department of Ophthalmology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200336, P.R. China
| | - Nan Lin
- Department of Ophthalmology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200336, P.R. China
| | - Wei Qiu
- Department of Ophthalmology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200336, P.R. China
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46
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He Q, Gao Y, Wang T, Zhou L, Zhou W, Yuan Z. Deficiency of Yes-Associated Protein Induces Cataract in Mice. Aging Dis 2019; 10:293-306. [PMID: 31011480 PMCID: PMC6457047 DOI: 10.14336/ad.2018.0910] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 09/10/2018] [Indexed: 12/25/2022] Open
Abstract
Cataract is a major cause of blindness worldwide, its complicated and unclear etiopathogenesis limit effective therapy. Here, we found that Yap, a downstream effector of the Hippo pathway, is specifically expressed in lens epithelial cells and Yap conditional knockout (cKO) in the lens leads to cataract. Histologically, Yap deficient lens show fewer epithelial cells, retention of nuclei and accumulation of morgagnian globules in the transitional zone and the posterior area. Mechanistically, GFAP-mediated Yap cKO leads to the reduced proliferation of epithelial cells, delayed fiber cell denucleation and increased cellular senescence in lens. Further RNA profiling analysis reveals Yap cKO results in a significant alteration in gene transcription that is involved in eye development, lens structure, inflammation, cellular proliferation and polarity. Collectively, our data reveal a novel function of Yap in the lens and links Yap deficiency with the development of cataract, making Yap a promising target for cataract therapy.
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Affiliation(s)
- Qing He
- 1State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.,2The Brain Science Center, Beijing Institute of Basic Medical Sciences, Beijing 100850, China.,3College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuhao Gao
- 1State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.,2The Brain Science Center, Beijing Institute of Basic Medical Sciences, Beijing 100850, China.,3College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tongxing Wang
- 4Beijing Institute of Pharmacology and Toxicology, Beijing 100850, China.,5State Key Laboratory of Toxicology and Medical Countermeasures, Beijing 100850, China
| | - Lujun Zhou
- 2The Brain Science Center, Beijing Institute of Basic Medical Sciences, Beijing 100850, China.,3College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenxia Zhou
- 4Beijing Institute of Pharmacology and Toxicology, Beijing 100850, China.,5State Key Laboratory of Toxicology and Medical Countermeasures, Beijing 100850, China
| | - Zengqiang Yuan
- 2The Brain Science Center, Beijing Institute of Basic Medical Sciences, Beijing 100850, China
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Han ZH, Wang F, Wang FL, Liu Q, Zhou J. Regulation of transforming growth factor β-mediated epithelial-mesenchymal transition of lens epithelial cells by c-Src kinase under high glucose conditions. Exp Ther Med 2018; 16:1520-1528. [PMID: 30116401 DOI: 10.3892/etm.2018.6348] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 02/22/2018] [Indexed: 02/06/2023] Open
Abstract
Recent studies have reported that high glucose (HG) conditions may contribute to the acceleration of renal cell apoptosis and renal fibrosis by inducing epithelial-mesenchymal transition (EMT) of tubular epithelial cells, in which c-Src kinase and transforming growth factor (TGF)-β are key modulators. In the present study, the roles of c-Src kinase and TGF-β in EMT of lens epithelial cells (LECs) under HG conditions were investigated. Results indicated human lens epithelial B3 (HLE-B3) cells under HG conditions exhibited significantly increased protein expression levels of phosphorylated c-Src (p-Src418) (P<0.05) and secreted a significantly increased amount of TGF-β compared with HLE-B3 cells under normal glucose conditions (P<0.05). Notably the c-Src inhibitor PP1 and the activin receptor-like kinase 5 (ALK5) inhibitor SB431542 suppressed EMT of HLE-B3 cells. Results indicated that PP1 significantly inhibited the activities of c-Src and ALK5 and the secretion of TGF-β, whereas SB431542 only significantly downregulated the protein expression levels and secretion of TGF-β (P<0.05). Following c-Src knockdown, the protein expression levels of p-Src418, ALK5 and TGF-β were significantly decreased, the secretion of TGF-β was significantly suppressed (both P<0.05) and EMT was decreased in HLE-B3 cells. These results suggest that c-Src and TGF-β may promote EMT of LECs under HG conditions, with c-Src as the upstream regulatory molecule. Thus, the signal axis of c-Src/TGF-β in EMT of LECs may be a potential novel therapeutic target for the prevention of diabetic subcapsular cataract.
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Affiliation(s)
- Zhi-Hua Han
- Department of Ophthalmology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Fang Wang
- Department of Ophthalmology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Fu-Lei Wang
- Department of Ophthalmology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Qi Liu
- Department of Ophthalmology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Jian Zhou
- Department of Ophthalmology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
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48
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Nahomi RB, Nagaraj RH. The role of HIF-1α in the TGF-β2-mediated epithelial-to-mesenchymal transition of human lens epithelial cells. J Cell Biochem 2018; 119:6814-6827. [PMID: 29693273 DOI: 10.1002/jcb.26877] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 03/21/2018] [Indexed: 01/23/2023]
Abstract
Human lens epithelial cells (HLE) undergo mesenchymal transition and become fibrotic during posterior capsule opacification (PCO), which is a frequent complication after cataract surgery. TGF-β2 has been implicated in this fibrosis. Previous studies have focused on the role of hypoxia-inducible factor-1α (HIF-1α) in fibrotic diseases, but the role of HIF-1α in the TGF-β2-mediated fibrosis in HLE is not known. TGF-β2 treatment (10 ng/mL, 48 h) increased the HIF-1α levels along with the EMT markers in cultured human lens epithelial cells (FHL124 cells). The increase in HIF-1α corresponded to an increase in VEGF-A in the culture medium. However, exogenous addition of VEGF-A (up to 10 ng/mL) did not alter the EMT marker levels in HLE. Addition of a prolyl hydroxylase inhibitor, dimethyloxalylglycine (DMOG, up to 10 µM), enhanced the levels of HIF-1α, and secreted VEGF-A but did not alter the EMT marker levels. However, treatment of cells with a HIF-1α translational inhibitor, KC7F2, significantly reduced the TGF-β2-mediated EMT response. This was accompanied by a reduction in the ERK phosphorylation and nuclear translocation of Snail and Slug. Together, these data suggest that HIF-1α is important for the TGF-β2-mediated EMT of human lens epithelial cells.
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Affiliation(s)
- Rooban B Nahomi
- Department of Ophthalmology, University of Colorado, Aurora, Colorado
| | - Ram H Nagaraj
- Department of Ophthalmology, University of Colorado, Aurora, Colorado.,Department of Pharmaceutical Science, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado, Aurora, Colorado
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49
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Nam MH, Nagaraj RH. Matrix-bound AGEs enhance TGFβ2-mediated mesenchymal transition of lens epithelial cells via the noncanonical pathway: implications for secondary cataract formation. Biochem J 2018; 475:1427-40. [PMID: 29588342 DOI: 10.1042/BCJ20170856] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 03/19/2018] [Accepted: 03/27/2018] [Indexed: 12/28/2022]
Abstract
Advanced glycation end products (AGEs) are post-translational modifications formed from the reaction of reactive carbonyl compounds with amino groups in proteins. Our laboratory has previously shown that AGEs in extracellular matrix (ECM) proteins promote TGFβ2 (transforming growth factor-beta 2)-mediated epithelial-to-mesenchymal transition (EMT) of lens epithelial cells (LECs), which could play a role in fibrosis associated with posterior capsule opacification. We have also shown that αB-crystallin plays an important role in TGFβ2-mediated EMT of LECs. Here, we investigated the signaling mechanisms by which ECM-AGEs enhance TGFβ2-mediated EMT in LECs. We found that in LECs cultured on AGE-modified basement protein extract (AGE-BME), TGFβ2 treatment up-regulated the mesenchymal markers α-SMA (α-smooth muscle actin) and αB-crystallin and down-regulated the epithelial marker E-cadherin more than LECs cultured on unmodified BME and treated with TGFβ2. Using a Multiplex Assay, we found that AGE-BME significantly up-regulated the noncanonical pathway by promoting phosphorylation of ERK (extracellular signal-regulated kinases), AKT, and p38 MAPK (mitogen-activated protein kinases) during TGFβ2-mediated EMT. This EMT response was strongly suppressed by inhibition of AKT and p38 MAPK phosphorylation. The AKT inhibitor LY294002 also suppressed TGFβ2-induced up-regulation of nuclear Snail and reduced phosphorylation of GSK3β. Inhibition of Snail expression suppressed TGFβ2-mediated α-SMA expression. αB-Crystallin was up-regulated in an AKT-dependent manner during AGE-BME/TGFβ2-mediated EMT in LECs. The absence of αB-crystallin in LECs suppressed TGFβ2-induced GSK3β phosphorylation, resulting in lower Snail levels. Taken together, these results show that ECM-AGEs enhance the TGFβ2-mediated EMT response through activation of the AKT/Snail pathway, in which αB-crystallin plays an important role as a linker between the TGFβ2 and AGE-mediated signaling pathways.
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50
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Feng H, Yang Z, Bai X, Yang M, Fang Y, Zhang X, Guo Q, Ning H. Therapeutic potential of a dual mTORC1/2 inhibitor for the prevention of posterior capsule opacification: An in vitro study. Int J Mol Med 2018; 41:2099-2107. [PMID: 29344639 PMCID: PMC5810205 DOI: 10.3892/ijmm.2018.3398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 01/10/2018] [Indexed: 12/14/2022] Open
Abstract
Mammalian target of rapamycin (mTOR) serves a central role in regulating cell growth and survival, and has been demonstrated to be involved in the pathological progression of posterior capsule opacification (PCO). In the present study, the potency of PP242, a novel dual inhibitor of mTOR complex 1/2 (mTORC1/2), in the suppression of the growth of human lens epithelial cells (HLECs) was investigated. Using a Cell Counting Kit‑8 and a wound healing assay, it was demonstrated that PP242 inhibited the proliferation and migration of HLECs. In addition, western blot analysis indicated that PP242 completely inhibited mTORC1 and mTORC2 downstream signaling activities, whereas rapamycin only partially inhibited mTORC1 activity within LECs. Furthermore, PP242 treatment led to an upregulation of the expression levels of p53 and B cell lymphoma‑2 (Bcl‑2)‑associated X and downregulation of Bcl‑2. In addition, flow cytometric analysis demonstrated that PP242 induced the cell cycle arrest at the G0/G1 phase, which may have caused apoptosis and induced autophagy within the LECs. The results of the present study suggested that administration of PP242 may potentially offer a novel therapeutic approach for the prevention of PCO.
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Affiliation(s)
- Hao Feng
- Department of Ophthalmology, The First Hospital of China Medical University
| | - Zhibo Yang
- Department of Ophthalmology, The Fourth People’s Hospital of Shenyang
| | - Xue Bai
- Department of Ophthalmology, The First Hospital of China Medical University
| | - Meirong Yang
- Department of Ophthalmology, The First Hospital of China Medical University
| | - Yuan Fang
- Department of Ophthalmology, The First Hospital of China Medical University
| | - Xiaonan Zhang
- Department of Ophthalmology, The First Hospital of China Medical University
| | - Qiqiang Guo
- Key Laboratory of Medical Cell Biology, College of Translational Medicine, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Hong Ning
- Department of Ophthalmology, The First Hospital of China Medical University
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