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Izuagbe S, Roy J, Chatila A, Hoang LQ, Ea V, Vaish B, Co CM, Ly A, Wu H, Tang L. A 3D in vitro model for assessing the influence of intraocular lens: Posterior lens capsule interactions on lens epithelial cell responses. Exp Eye Res 2024; 244:109940. [PMID: 38782178 DOI: 10.1016/j.exer.2024.109940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 05/19/2024] [Accepted: 05/21/2024] [Indexed: 05/25/2024]
Abstract
Posterior Capsule Opacification (PCO), the most frequent complication of cataract surgery, is caused by the infiltration and proliferation of lens epithelial cells (LECs) at the interface between the intraocular lens (IOL) and posterior lens capsule (PLC). According to the "no space, no cells, no PCO" theory, high affinity (or adhesion force) between the IOL and PLC would decrease the IOL: PLC interface space, hinder LEC migration, and thus reduce PCO formation. To test this hypothesis, an in vitro hemisphere-shaped simulated PLC (sPLC) was made to mimic the human IOL: PLC physical interactions and to assess their influence on LEC responses. Three commercially available IOLs with different affinities/adhesion forces toward the sPLC, including Acrylic foldable IOL, Silicone IOL, and PMMA IOL, were used in this investigation. Using the system, the physical interactions between IOLs and sPLC were quantified by measuring the adhesion force and interface space using an adhesion force apparatus and Optical Coherence Tomography, respectively. Our data shows that high adhesion force and tight binding between IOL and sPLC contribute to a small interface space (or "no space"). By introducing LECs into the in vitro system, we found that, with small interface space, among all IOLs, acrylic foldable IOLs permitted the least extent of LEC infiltration, proliferation, and differentiation (or "no cells"). Further statistical analyses using clinical data revealed that weak LEC responses are associated with low clinical PCO incidence rates (or "no PCO"). The findings support that the in vitro system could simulate IOL: PLC interplays and predict IOLs' PCO potential in support of the "no space, no cells, no PCO" hypothesis.
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Affiliation(s)
- Samira Izuagbe
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Joyita Roy
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Amjad Chatila
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Le Quynh Hoang
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Vicki Ea
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Bhavya Vaish
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Cynthia M Co
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Aaron Ly
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Hongli Wu
- Department of Pharmaceutical Sciences, College of Pharmacy, North Texas Eye Research Institute, University of North Texas Health Science Center, Fort Worth, TX, 76107, USA
| | - Liping Tang
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA.
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2
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Millán Cotto HA, Pathrikar TV, Hakim B, Baby HM, Zhang H, Zhao P, Ansaripour R, Amini R, Carrier RL, Bajpayee AG. Cationic-motif-modified exosomes for mRNA delivery to retinal photoreceptors. J Mater Chem B 2024. [PMID: 38946491 DOI: 10.1039/d4tb00849a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/02/2024]
Abstract
Topical treatment of vitreoretinal diseases remains a challenge due to slow corneal uptake and systemic clearance. Exosomes are emerging nanocarriers for drug delivery due to biocompatibility and cellular targeting properties. To apply them for retinal targeting via the topical route, exosomes must traverse various ocular barriers including the cornea, lens, vitreous humor (VH), and the retina itself. Here we engineered high-purity milk-derived exosomes by anchoring arginine-rich cationic motifs via PEG2000 lipid insertion on their surface. Modification enabled exosomes to use weak-reversible electrostatic interactions with anionic glycosaminoglycan (GAG) and water content of the tissue to enhance their transport rate and retention. Addition of cationic motifs neutralized the anionic surface charge of exosomes (-24 to -2 mV) without impacting size or morphology. Cationic-motif-modified exosomes exhibited two-fold faster steady state diffusivity through bovine corneas compared to unmodified exosomes. Fluorescence recovery after photobleaching confirmed that cationic-motif-modified exosomes can diffuse through VH without steric hindrance. In healthy VH, cationic-motif-modified exosomes demonstrated stronger binding resulting in three-fold lower average diffusivity that enhanced by six-fold in 50% GAG-depleted VH recapitulating advanced liquefaction. Cationic-motif-modified exosomes penetrated through the full-thickness of porcine retinal explants resulting in ten-fold higher uptake in photoreceptors and three-fold greater transfection with encapsulated eGFP mRNA compared to unmodified exosomes. Cationic-motif-modified exosomes are safe to use as they did not adversely affect the mechanical swelling properties of the cornea or lens nor impact retinal cell viability. Cationic-motif-modified exosomes, therefore, offer themselves as a cell-free nanocarrier platform for gene delivery to retinal photoreceptors potentially via the topical route.
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Affiliation(s)
| | | | - Bill Hakim
- Department of Bioengineering, Northeastern University, Boston, MA, 02115, USA.
| | - Helna M Baby
- Department of Bioengineering, Northeastern University, Boston, MA, 02115, USA.
| | - Hengli Zhang
- Department of Bioengineering, Northeastern University, Boston, MA, 02115, USA.
| | - Peng Zhao
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA.
| | - Ronak Ansaripour
- Department of Bioengineering, Northeastern University, Boston, MA, 02115, USA.
| | - Rouzbeh Amini
- Department of Bioengineering, Northeastern University, Boston, MA, 02115, USA.
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA
| | - Rebecca L Carrier
- Department of Bioengineering, Northeastern University, Boston, MA, 02115, USA.
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA.
| | - Ambika G Bajpayee
- Department of Bioengineering, Northeastern University, Boston, MA, 02115, USA.
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA.
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA
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3
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Shiels A. Through the Cat-Map Gateway: A Brief History of Cataract Genetics. Genes (Basel) 2024; 15:785. [PMID: 38927721 PMCID: PMC11202810 DOI: 10.3390/genes15060785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 06/06/2024] [Accepted: 06/13/2024] [Indexed: 06/28/2024] Open
Abstract
Clouding of the transparent eye lens, or cataract(s), is a leading cause of visual impairment that requires surgical replacement with a synthetic intraocular lens to effectively restore clear vision. Most frequently, cataract is acquired with aging as a multifactorial or complex trait. Cataract may also be inherited as a classic Mendelian trait-often with an early or pediatric onset-with or without other ocular and/or systemic features. Since the early 1990s, over 85 genes and loci have been genetically associated with inherited and/or age-related forms of cataract. While many of these underlying genes-including those for lens crystallins, connexins, and transcription factors-recapitulate signature features of lens development and differentiation, an increasing cohort of unpredicted genes, including those involved in cell-signaling, membrane remodeling, and autophagy, has emerged-providing new insights regarding lens homeostasis and aging. This review provides a brief history of gene discovery for inherited and age-related forms of cataract compiled in the Cat-Map database and highlights potential gene-based therapeutic approaches to delay, reverse, or even prevent cataract formation that may help to reduce the increasing demand for cataract surgery.
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Affiliation(s)
- Alan Shiels
- Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA
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4
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Zhang L, Liu X, Li W, Liu K, Zhang J, Liu X, Wang J. Integrative transcriptomic profiling of ncRNAs and mRNAs in developing mouse lens. Front Genet 2024; 15:1405715. [PMID: 38933921 PMCID: PMC11199715 DOI: 10.3389/fgene.2024.1405715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2024] [Accepted: 05/21/2024] [Indexed: 06/28/2024] Open
Abstract
In recent years, burgeoning research has underscored the pivotal role of non-coding RNA in orchestrating the growth, development, and pathogenesis of various diseases across organisms. However, despite these advances, our understanding of the specific contributions of long non-coding RNAs (lncRNAs) and circular RNAs (circRNAs) to lens development remains notably limited. Clarifying the intricate gene regulatory networks is imperative for unraveling the molecular underpinnings of lens-related disorders. In this study, we aimed to address this gap by conducting a comprehensive analysis of the expression profiles of messenger RNAs (mRNAs), lncRNAs, and circRNAs at critical developmental time points of the mouse lens, encompassing both embryonic (E10.5, E12.5, and E16.5) and postnatal stages (P0.5, P10.5, and P60). Leveraging RNA-sequencing technology, we identified key transcripts pivotal to lens development. Our analysis revealed differentially expressed (DE) mRNAs, lncRNAs, and circRNAs across various developmental stages. Particularly noteworthy, there were 1831 co-differentially expressed (CO-DE) mRNAs, 150 CO-DE lncRNAs, and 13 CO-DE circRNAs identified during embryonic stages. Gene Ontology (GO) enrichment analysis unveiled associations primarily related to lens development, DNA conformational changes, and angiogenesis among DE mRNAs and lncRNAs. Furthermore, employing protein-protein interaction networks, mRNA-lncRNA co-expression networks, and circRNA-microRNA-mRNA networks, we predicted candidate key molecules implicated in lens development. Our findings underscore the pivotal roles of lncRNAs and circRNAs in this process, offering fresh insights into the pathogenesis of lens-related disorders and paving the way for future exploration in this field.
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Affiliation(s)
- Liyun Zhang
- Department of Ophthalmology, General Hospital of Central Theater Command, Wuhan, China
| | - Xin Liu
- Shenzhen Eye Hospital, Jinan University, Shenzhen Eye Institute, Shenzhen, Guangdong, China
| | - Wei Li
- Department of Pediatric Respiratory Medicine, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Kaiqing Liu
- The Department of Urology, The Third Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong, China
| | - Jing Zhang
- Shenzhen Eye Hospital, Jinan University, Shenzhen Eye Institute, Shenzhen, Guangdong, China
| | - Xinhua Liu
- Shenzhen Eye Hospital, Jinan University, Shenzhen Eye Institute, Shenzhen, Guangdong, China
| | - Jiantao Wang
- Shenzhen Eye Hospital, Jinan University, Shenzhen Eye Institute, Shenzhen, Guangdong, China
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5
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VanSlyke JK, Boswell BA, Musil LS. TGFβ overcomes FGF-induced transinhibition of EGFR in lens cells to enable fibrotic secondary cataract. Mol Biol Cell 2024; 35:ar75. [PMID: 38598298 DOI: 10.1091/mbc.e24-01-0040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024] Open
Abstract
To cause vision-disrupting fibrotic secondary cataract (PCO), lens epithelial cells that survive cataract surgery must migrate to the posterior of the lens capsule and differentiate into myofibroblasts. During this process, the cells become exposed to the FGF that diffuses out of the vitreous body. In normal development, such relatively high levels of FGF induce lens epithelial cells to differentiate into lens fiber cells. It has been a mystery as to how lens cells could instead undergo a mutually exclusive cell fate, namely epithelial to myofibroblast transition, in the FGF-rich environment of the posterior capsule. We and others have reported that the ability of TGFβ to induce lens cell fibrosis requires the activity of endogenous ErbBs. We show here that lens fiber-promoting levels of FGF induce desensitization of ErbB1 (EGFR) that involves its phosphorylation on threonine 669 mediated by both ERK and p38 activity. Transinhibition of ErbB1 by FGF is overcome by a time-dependent increase in ErbB1 levels induced by TGFβ, the activation of which is increased after cataract surgery. Our studies provide a rationale for why TGFβ upregulates ErbB1 in lens cells and further support the receptor as a therapeutic target for PCO.
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Affiliation(s)
- Judy K VanSlyke
- Department of Chemical Physiology and Biochemistry, Oregon Health & Science University, Portland, OR 97239
| | - Bruce A Boswell
- Department of Chemical Physiology and Biochemistry, Oregon Health & Science University, Portland, OR 97239
| | - Linda S Musil
- Department of Chemical Physiology and Biochemistry, Oregon Health & Science University, Portland, OR 97239
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6
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Davies LN, Biswas S, Bullimore M, Cruickshank F, Estevez JJ, Khanal S, Kollbaum P, Marcotte-Collard R, Montani G, Plainis S, Richdale K, Simard P, Wolffsohn JS. BCLA CLEAR presbyopia: Mechanism and optics. Cont Lens Anterior Eye 2024:102185. [PMID: 38796331 DOI: 10.1016/j.clae.2024.102185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2024]
Abstract
With over a billion adults worldwide currently affected, presbyopia remains a ubiquitous, global problem. Despite over a century of study, the precise mechanism of ocular accommodation and presbyopia progression remains a topic of debate. Accordingly, this narrative review outlines the lenticular and extralenticular components of accommodation together with the impact of age on the accommodative apparatus, neural control of accommodation, models of accommodation, the impact of presbyopia on retinal image quality, and both historic and contemporary theories of presbyopia.
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Affiliation(s)
- Leon N Davies
- School of Optometry, College of Health and Life Sciences, Aston University, Birmingham, UK.
| | - Sayantan Biswas
- School of Optometry, College of Health and Life Sciences, Aston University, Birmingham, UK
| | | | - Fiona Cruickshank
- Division of Pharmacy and Optometry, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, UK
| | - Jose J Estevez
- Caring Futures Institute, College of Nursing and Health Sciences, Optometry and Vision Science, Flinders University, Adelaide, Australia; Flinders Centre for Ophthalmology, Eye and Vision Research, Department of Ophthalmology, Flinders University, Adelaide, Australia
| | - Safal Khanal
- Department of Optometry and Vision Science, The University of Alabama at Birmingham, USA
| | | | | | | | - Sotiris Plainis
- Laboratory of Optics and Vision, School of Medicine, University of Crete, Greece
| | | | - Patrick Simard
- School of Optometry, Universite de Montreal, Montreal, Quebec, Canada
| | - James S Wolffsohn
- School of Optometry, College of Health and Life Sciences, Aston University, Birmingham, UK
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7
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Stodulka P, Packard R, Mordaunt D. Intraoperative trypan blue central landmark and its use in capsulotomy and capsulorhexis centration. J Cataract Refract Surg 2024; 50:498-504. [PMID: 38651697 DOI: 10.1097/j.jcrs.0000000000001385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 12/08/2023] [Indexed: 04/25/2024]
Abstract
PURPOSE To compare 3 capsulotomy centration methods. SETTING Private clinic, Zlin, Czech Republic. DESIGN Prospective, consecutive case series. METHODS 180 eyes undergoing cataract surgery had anterior capsule staining with microfiltered 0.4% trypan blue solution before selective laser capsulotomy. The first 60 eyes (Group 1) had mydriatic dilated pupil centered capsulotomies. The next 60 eyes (Group 2) were centered on the trypan blue central landmark (TCL). The final 60 capsulotomies (Group 3) were centered on the patient fixated coaxial Purkinje reflex (CPR). Measurements between key anatomical landmarks and the TCL, CPR capsulotomies, and implanted intraocular lens (IOL) center were made. RESULTS The TCL, observed in >94% of eyes in the study, coincided with the CPR with a displacement of <0.1 ± 0.1 mm. Group 1 capsulotomies were noticeably decentered on the IOLs by 0.3 ± 0.2 mm. The Group 2 symmetrical IOL relationship was maintained with a decentration of 0.15 ± 0.1 mm. Group 3 had a similar decentration with the IOLs with 0.15 ± 0.1 mm. Verification with IOLMaster 700 data and CALLISTO Eye System showed that the CPR and the TCL were coincident with the measured visual axis. CONCLUSIONS The clearly visible TCL served as an alternate landmark to the patient fixated CPR, and being on the anterior capsule was not sensitive to tilt. Further patient compliance was not required. Both were superior to dilated pupil centration, to achieve symmetric IOL coverage. This has application for both capsulotomies and capsulorhexes.
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Affiliation(s)
- Pavel Stodulka
- From the Gemini Eye Clinic, Zlin, Czech Republic (Stodulka); Prince Charles Eye Unit, King Edward VII Hospital, Windsor, United Kingdom (Packard); Department of Engineering, Zurich University of Applied Science, Zurich, Switzerland (Mordaunt)
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8
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Ben Moussa O, Parveau L, Aouimeur I, Egaud G, Maurin C, Fraine S, Urbaniak S, Perrache C, He Z, Xxx S, Dorado Cortez O, Poinard S, Mauclair C, Gain P, Thuret G. Femtosecond Laser Cutting of Human Crystalline Lens Capsule and Decellularization for Corneal Endothelial Bioengineering. Bioengineering (Basel) 2024; 11:255. [PMID: 38534529 DOI: 10.3390/bioengineering11030255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 02/28/2024] [Accepted: 03/01/2024] [Indexed: 03/28/2024] Open
Abstract
The bioengineering of corneal endothelial grafts consists of seeding in vitro cultured corneal endothelial cells onto a thin, transparent, biocompatible, and sufficiently robust carrier which can withstand surgical manipulations. This is one of the most realistic alternatives to donor corneas, which are in chronic global shortage. The anterior capsule of the crystalline lens has already been identified as one of the best possible carriers, but its challenging manual preparation has limited its use. In this study, we describe a femtosecond laser cutting process of the anterior capsule of whole lenses in order to obtain capsule discs of 8 mm diameter, similar to conventional endothelial grafts. Circular marks made on the periphery of the disc indicate its orientation. Immersion in water for 3 days is sufficient to completely remove the lens epithelial cells and to enable the seeding of corneal endothelial cells, which remain viable after 27 days of culture. Therefore, this method provides a transparent, decellularized disc ready to form viable tissue engineered endothelial grafts.
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Affiliation(s)
- Olfa Ben Moussa
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
| | - Louise Parveau
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
| | - Inès Aouimeur
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
| | - Grégory Egaud
- GIE Manutech-USD, 18 Rue Professeur Benoît Lauras, 42000 Saint-Etienne, France
| | - Corantin Maurin
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
| | - Sofiane Fraine
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
| | - Sébastien Urbaniak
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
| | - Chantal Perrache
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
| | - Zhiguo He
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
| | - Sedao Xxx
- Laboratoire Hubert Curien, Jean Monnet University, 18 Rue Professeur Benoît Lauras, 42000 Saint-Etienne, France
| | - Oliver Dorado Cortez
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
- Ophthalmology Department, University Hospital, Avenue Albert Raimond, CEDEX 02, 42055 Saint-Etienne, France
| | - Sylvain Poinard
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
- Ophthalmology Department, University Hospital, Avenue Albert Raimond, CEDEX 02, 42055 Saint-Etienne, France
| | - Cyril Mauclair
- Laboratoire Hubert Curien, Jean Monnet University, 18 Rue Professeur Benoît Lauras, 42000 Saint-Etienne, France
| | - Philippe Gain
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
- Ophthalmology Department, University Hospital, Avenue Albert Raimond, CEDEX 02, 42055 Saint-Etienne, France
| | - Gilles Thuret
- Laboratory Biology, Engineering and Imaging for Ophthalmology, BiiO, Faculty of Medicine, Health Innovation Campus, Jean Monnet University, 10 Rue de la Marandière, 42270 Saint-Priest-en-Jarez, France
- Ophthalmology Department, University Hospital, Avenue Albert Raimond, CEDEX 02, 42055 Saint-Etienne, France
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9
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Hashimi M, Amin HA, Zagkos L, Day AC, Drenos F. Using genetics to investigate the association between lanosterol and cataract. Front Genet 2024; 15:1231521. [PMID: 38440190 PMCID: PMC10910428 DOI: 10.3389/fgene.2024.1231521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 02/06/2024] [Indexed: 03/06/2024] Open
Abstract
Background: Cataract is one of the most prevalent causes of blindness worldwide. Whilst surgery is the primary treatment for cataracts, it is not always an available option, particularly in developing countries. Non-surgical methods of treatment would increase treatment availability for more patients. Several studies have investigated how topical application of oxysterols, such as lanosterol, may break down aggregated proteins and restore lens transparency. However, the results are conflicting and inconclusive. Aim: In this study, we focus on combining genetic evidence for associations between lanosterol related genetic variation and cataract to explore whether lanosterol is a potentially suitable drug treatment option. Method: Using data from 45,449 available cataract cases from the UK Biobank, with participant ages ranging from 40-69, we conducted a genetic association study (GWAS) to assess the risk of cataract. Cataract cases were defined using diagnostic and operation codes. We focused on genetic variants in the lanosterol synthase gene region. We also compared our results with previously published genetic associations of phytosterol-to-lanosterol ratios. Finally, we performed a genetic risk score analysis to test the association between lanosterol within the cholesterol synthesis pathway and the risk of cataract. Results: No statistically significant single nucleotide polymorphisms (SNPs) associations with cataract were observed in the gene region of lanosterol synthase at a multiple testing adjusted significance threshold of p < 0.05/13. The comparison between cataract risk and genetic association of 8 phytosterol-to-lanosterol GWAS results also showed no evidence to support lanosterol's protective properties for cataract risk. No statistically significant association was found between the lanosterol within the cholesterol synthesis pathway genetic risk score and cataract outcomes (OR = 1.002 p = 0.568). Conclusion: There was no evidence observed for genetic associations between lanosterol and cataract risk. Our results do not support lanosterol's potential role in treating cataracts. Further research may be needed to address the effect of lanosterol on specific cataract subtypes.
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Affiliation(s)
- Munisa Hashimi
- Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, United Kingdom
| | - Hasnat A. Amin
- Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, United Kingdom
| | - Loukas Zagkos
- Department of Epidemiology and Biostatistics, Imperial College London, London, United Kingdom
| | - Alexander C. Day
- Moorfields Eye Hospital, London, United Kingdom
- UCL Institute of Ophthalmology, London, United Kingdom
| | - Fotios Drenos
- Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, United Kingdom
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10
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Schoenenberger MS, Halfter W, Ferrand A, Halfter K, Tzankov A, Scholl HPN, Henrich PB, Monnier CA. The biophysical and compositional properties of human basement membranes. FEBS J 2024; 291:477-488. [PMID: 37984833 DOI: 10.1111/febs.17007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 10/14/2023] [Accepted: 11/16/2023] [Indexed: 11/22/2023]
Abstract
Basement membranes are among the most widespread, non-cellular functional materials in metazoan organisms. Despite this ubiquity, the links between their compositional and biophysical properties are often difficult to establish due to their thin and delicate nature. In this article, we examine these features on a molecular level by combining results from proteomics, elastic, and nanomechanical analyses across a selection of human basement membranes. Comparing results between these different membranes connects certain compositional attributes to distinct nanomechanical signatures and further demonstrates to what extent water defines these properties. In all, these data underline BMs as stiff yet highly elastic connective tissue layers and highlight how the interplay between composition, mechanics and hydration yields such exceptionally adaptable materials.
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Affiliation(s)
| | - Willi Halfter
- Department of Ophthalmology, University of Basel, Switzerland
| | - Alexia Ferrand
- Imaging Core Facility, Biozentrum of the University of Basel, Switzerland
| | - Kathrin Halfter
- Munich Cancer Registry, Institute of Medical Informatics, Biometry and Epidemiology, Maximilian University Munich, Germany
| | - Alexandar Tzankov
- Histopathology and Autopsy, Institute of Medical Genetics and Pathology, University Hospital and University of Basel, Switzerland
| | - Hendrik P N Scholl
- Department of Ophthalmology, University of Basel, Switzerland
- Institute of Molecular and Clinical Ophthalmology Basel (IOB), Switzerland
| | - Paul Bernhard Henrich
- Department of Ophthalmology, University of Basel, Switzerland
- Università della Svizzera Italiana, Lugano, Switzerland
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11
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O'Neill LM, Wang Y, Duncan MK. Modeling Cataract Surgery in Mice. J Vis Exp 2023:10.3791/66050. [PMID: 38108456 PMCID: PMC10981495 DOI: 10.3791/66050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023] Open
Abstract
Cataract surgery (CS) is an effective treatment for cataracts, a major cause of visual disability worldwide. However, CS leads to ocular inflammation, and in the long term, it can result in posterior capsular opacification (PCO) and/or lens dislocation driven by the post-surgical overgrowth of lens epithelial cells (LECs) and their conversion to myofibroblasts and/or aberrant fiber cells. However, the molecular mechanisms by which CS results in inflammation and PCO are still obscure because most in vitro models do not recapitulate the wound healing response of LECs seen in vivo, while traditional animal models of cataract surgery, such as rabbits, do not allow the genetic manipulation of gene expression to test mechanisms. Recently, our laboratory and others have successfully used genetically modified mice to study the molecular mechanisms that drive the induction of proinflammatory signaling and LEC epithelial to mesenchymal transition, leading to new insight into PCO pathogenesis. Here, we report the established protocol for modeling cataract surgery in mice, which allows for robust transcriptional profiling of the response of LECs to lens fiber cell removal via RNAseq, the evaluation of protein expression by semi-quantitative immunofluorescence, and the use of modern mouse genetics tools to test the function of genes that are hypothesized to participate in the pathogenesis of acute sequelae like inflammation as well as the later conversion of LECs to myofibroblasts and/or aberrant lens fiber cells.
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Affiliation(s)
- Leah M O'Neill
- Department of Biological Sciences, University of Delaware
| | - Yan Wang
- Department of Biological Sciences, University of Delaware
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12
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Lin C, Yang Y, Gao H, Zheng Y, Ma K, Guang C. Evaluation of continuous curvilinear capsulorhexis based on a neural-network. Int J Comput Assist Radiol Surg 2023; 18:2203-2212. [PMID: 37300662 DOI: 10.1007/s11548-023-02973-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 05/23/2023] [Indexed: 06/12/2023]
Abstract
PURPOSE Continuous curvilinear capsulorhexis (CCC), as a prerequisite for successful cataract surgery, is one of the most important and difficult steps in phacoemulsification. In clinical practice, the size and circularity of the capsular tear and eccentricity with the lens are often employed as indicators to evaluate the effect of CCC. METHODS We present a neural network-based model to improve the efficiency and accuracy of evaluation for capsulorhexis results. The capsulorhexis results evaluation model consists of the detection network based on U-Net and the nonlinear fitter built from fully connected layers. The detection network is responsible for detecting the positions of the round capsular tear and lens margin, and the nonlinear fitter is utilized to fit the outputs of the detection network and to compute the capsulorhexis results evaluation indicators. We evaluate the proposed model on an artificial eye phantom and compare its performance with the medical evaluation method. RESULTS The experimental results show that the average detection error of the proposed evaluation model is within 0.04 mm. Compared with the medical method (the average detection error is 0.28 mm), the detection accuracy of the proposed evaluation model is more accurate and stable. CONCLUSION We propose a neural network-based capsulorhexis results evaluation model to improve the accuracy of evaluation for capsulorhexis results. The results of the evaluation experiments show that the proposed results evaluation model evaluates of the effect of capsulorhexis better than the medical evaluation method.
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Affiliation(s)
- Chuang Lin
- School of Mechanical Engineering and Automation, Beihang University, Beijing, 100083, China
| | - Yang Yang
- School of Mechanical Engineering and Automation, Beihang University, Beijing, 100083, China
| | - Handa Gao
- School of Mechanical Engineering and Automation, Beihang University, Beijing, 100083, China
| | - Yu Zheng
- College of Automation and College of Artificial Intelligence, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China
| | - Ke Ma
- Eye Center of Beijing Tongren Hospital, Capital Medical University, Beijing, 100005, China
| | - Chenhan Guang
- School of Mechanical Engineering and Automation, Beihang University, Beijing, 100083, China.
- College of Mechanical and Storage and Transportation Engineering, China University of Petroleum-Beijing, Beijing, China.
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Zhu M, Hu W, Lin L, Yang Q, Zhang L, Xu J, Xu Y, Liu J, Zhang M, Tong X, Zhu K, Feng K, Feng Y, Su J, Huang X, Li J. Single-cell RNA sequencing reveals new subtypes of lens superficial tissue in humans. Cell Prolif 2023; 56:e13477. [PMID: 37057399 PMCID: PMC10623935 DOI: 10.1111/cpr.13477] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 03/27/2023] [Accepted: 04/01/2023] [Indexed: 04/15/2023] Open
Abstract
Although the cell atlas of the human ocular anterior segment of the human eye was revealed by single-nucleus RNA sequencing, whether subtypes of lens stem/progenitor cells exist among epithelial cells and the molecular characteristics of cell differentiation of the human lens remain unclear. Single-cell RNA sequencing is a powerful tool to analyse the heterogeneity of tissues at the single cell level, leading to a better understanding of the processes of cell differentiation. By profiling 18,596 cells in human lens superficial tissue through single-cell sequencing, we identified two subtypes of lens epithelial cells that specifically expressed C8orf4 and ADAMTSL4 with distinct spatial localization, a new type of fibre cells located directly adjacent to the epithelium, and a subpopulation of ADAMTSL4+ cells that might be lens epithelial stem/progenitor cells. We also found two trajectories of lens epithelial cell differentiation and changes of some important genes during differentiation.
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Affiliation(s)
- Meng‐Chao Zhu
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Wei Hu
- Department of Integrative Medicine and Neurobiology, School of Basic Medical Sciences, Institutes of Brain Science, Brain Science Collaborative Innovation Center, State Key Laboratory of Medical Neurobiology, Institute of Acupuncture and Moxibustion, Fudan Institutes of Integrative MedicineFudan UniversityShanghaiChina
| | - Lei Lin
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Qing‐Wen Yang
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Lu Zhang
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Jia‐Lin Xu
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Yi‐Tong Xu
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Jia‐Sheng Liu
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Meng‐Di Zhang
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Xiao‐Yu Tong
- Zhejiang Provincial Clinical Research Center for Pediatric DiseaseThe Second Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiangChina
| | - Kai‐Yi Zhu
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Ke Feng
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Yi Feng
- Department of Integrative Medicine and Neurobiology, School of Basic Medical Sciences, Institutes of Brain Science, Brain Science Collaborative Innovation Center, State Key Laboratory of Medical Neurobiology, Institute of Acupuncture and Moxibustion, Fudan Institutes of Integrative MedicineFudan UniversityShanghaiChina
| | - Jian‐Zhong Su
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
| | - Xiu‐Feng Huang
- Zhejiang Provincial Clinical Research Center for Pediatric DiseaseThe Second Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiangChina
| | - Jin Li
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye HospitalWenzhou Medical UniversityWenzhouChina
- National Clinical Research Center for Ocular Diseases, Eye HospitalWenzhou Medical UniversityWenzhouChina
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14
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Thakur A, Bansal M, Challa D, Malhotra C, Jain AK. Dead bag syndrome-in the capsular bag subluxated intraocular lens centration and refixation: A new technique. Indian J Ophthalmol 2023; 71:3412-3414. [PMID: 37787245 PMCID: PMC10683701 DOI: 10.4103/ijo.ijo_1061_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 06/15/2023] [Accepted: 06/28/2023] [Indexed: 10/04/2023] Open
Abstract
We describe a technique of scleral IOL fixation and optic centration of in the capsular bag subluxated IOL in a patient of "dead bag syndrome." A 29-year-old male diagnosed case of thalassemia presented with painless progressive diminution of vision in the left eye following uncomplicated sequential phacoemulsification in both eyes 15 years back. The right eye revealed completely centered IOL with significant amount of anterior capsular opacification (ACO), while the left eye revealed inferior subluxation of the IOL within capsular bag. The capsular bag was dilated, diaphanous with clear anterior and posterior capsule without any evidence of capsular fibrosis or opacification. Thus, a diagnosis of "dead bag syndrome" was made. The haptics were sutured to sclera (Hoffman's pockets) using two loops of 9-0 polypropylene, passed anterior and posterior to IOL haptics within the capsular bag. Postoperatively, the patient had a vision of 20/40 with a centered intraocular lens.
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Affiliation(s)
- Anchal Thakur
- Department of Ophthalmology, Advanced Eye Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Muskaan Bansal
- Department of Ophthalmology, Advanced Eye Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Divya Challa
- Department of Ophthalmology, Advanced Eye Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Chintan Malhotra
- Department of Ophthalmology, Advanced Eye Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Arun K Jain
- Department of Ophthalmology, Advanced Eye Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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15
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Zhu Y, Li D, Reyes-Ortega F, Chinnery HR, Schneider-Futschik EK. Ocular development after highly effective modulator treatment early in life. Front Pharmacol 2023; 14:1265138. [PMID: 37795027 PMCID: PMC10547496 DOI: 10.3389/fphar.2023.1265138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Accepted: 09/06/2023] [Indexed: 10/06/2023] Open
Abstract
Highly effective cystic fibrosis (CF) transmembrane conductance regulator (CFTR) modulator therapies (HEMT), including elexacaftor-tezacaftor-ivacaftor, correct the underlying molecular defect causing CF. HEMT decreases general symptom burden by improving clinical metrics and quality of life for most people with CF (PwCF) with eligible CFTR variants. This has resulted in more pregnancies in women living with CF. All HEMT are known to be able pass through the placenta and into breast milk in mothers who continue on this therapy while pregnant and breast feeding. Toxicity studies of HEMT in young rats demonstrated infant cataracts, and case reports have reported the presence of congenital cataracts in early life exposure to HEMT. This article reviews the evidence for how HEMT influences the dynamic and interdependent processes of healthy and abnormal lens development in the context of HEMT exposure during pregnancy and breastfeeding, and raises questions that remain unanswered.
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Affiliation(s)
- Yimin Zhu
- Department of Biochemistry and Pharmacology, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - Danni Li
- Department of Biochemistry and Pharmacology, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - Felisa Reyes-Ortega
- Department of Biochemistry and Pharmacology, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, VIC, Australia
- Department of Ophthalmology, Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Reina Sofia University Hospital and University of Cordoba, Cordoba, Spain
| | - Holly R. Chinnery
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - Elena K. Schneider-Futschik
- Department of Biochemistry and Pharmacology, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, VIC, Australia
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16
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Zhou N, Liu YD, Zhang Y, Gu TW, Peng LH. Pharmacological Functions, Synthesis, and Delivery Progress for Collagen as Biodrug and Biomaterial. Pharmaceutics 2023; 15:pharmaceutics15051443. [PMID: 37242685 DOI: 10.3390/pharmaceutics15051443] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 04/21/2023] [Accepted: 05/05/2023] [Indexed: 05/28/2023] Open
Abstract
Collagen has been widely applied as a functional biomaterial in regulating tissue regeneration and drug delivery by participating in cell proliferation, differentiation, migration, intercellular signal transmission, tissue formation, and blood coagulation. However, traditional extraction of collagen from animals potentially induces immunogenicity and requires complicated material treatment and purification steps. Although semi-synthesis strategies such as utilizing recombinant E. coli or yeast expression systems have been explored as alternative methods, the influence of unwanted by-products, foreign substances, and immature synthetic processes have limited its industrial production and clinical applications. Meanwhile, macromolecule collagen products encounter a bottleneck in delivery and absorption by conventional oral and injection vehicles, which promotes the studies of transdermal and topical delivery strategies and implant methods. This review illustrates the physiological and therapeutic effects, synthesis strategies, and delivery technologies of collagen to provide a reference and outlook for the research and development of collagen as a biodrug and biomaterial.
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Affiliation(s)
- Nan Zhou
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yu-Da Liu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yue Zhang
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Ting-Wei Gu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Li-Hua Peng
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau 999078, China
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17
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Li H, Gao L, Du J, Ma T, Li W, Ye Z, Li Z. Impacts of autophagy on the formation of organelle-free zone during the lens development. Mol Biol Rep 2023; 50:4551-4564. [PMID: 36877352 DOI: 10.1007/s11033-023-08323-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 02/02/2023] [Indexed: 03/07/2023]
Abstract
The thorough degeneration of organelles in the core of the lens is certainly a hallmark event during the lens development. Organelles degradation in the terminal differentiation process of lens fiber cells to form an organelle-free zone is critical for lens maturation and transparency. Several mechanisms have been proposed to expand our understanding of lens organelles degradation, including apoptotic pathways, the participation of ribozyme, proteolytic enzyme and phospholipase A and acyltransferase, and the newly discovered roles for autophagy. Autophagy is a lysosome-dependent degradation reaction during which the "useless" cellular components are degraded and recycled. These cellular components, such as incorrectly folded proteins, damaged organelles and other macromolecules, are first engulfed by the autophagosome before being further delivered to lysosomes for degradation. Although autophagy has been recognized involving in organelle degradation of the lens, the detailed functions remain to be discovered. Recent advances have revealed that autophagy not only plays a vital role in the intracellular quality control of the lens but is also involved in the degradation of nonnuclear organelles in the process of lens fiber cell differentiation. Herein, we first review the potential mechanisms of organelle-free zone formation, then discuss the roles of autophagy in intracellular quality control and cataract formation, and finally substantially summarize the potential involvement of autophagy in the development of organelle-free zone formation.
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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
- Medical School of Chinese PLA, Beijing, China.,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
| | - Wen Li
- Medical School of Chinese PLA, Beijing, China.,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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A tapt1 knock-out zebrafish line with aberrant lens development and impaired vision models human early-onset cataract. Hum Genet 2023; 142:457-476. [PMID: 36697720 DOI: 10.1007/s00439-022-02518-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 12/19/2022] [Indexed: 01/27/2023]
Abstract
Bi-allelic mutations in the gene coding for human trans-membrane anterior-posterior transformation protein 1 (TAPT1) result in a broad phenotypic spectrum, ranging from syndromic disease with severe skeletal and congenital abnormalities to isolated early-onset cataract. We present here the first patient with a frameshift mutation in the TAPT1 gene, resulting in both bilateral early-onset cataract and skeletal abnormalities, in addition to several dysmorphic features, in this way further expanding the phenotypic spectrum associated with TAPT1 mutations. A tapt1a/tapt1b double knock-out (KO) zebrafish model generated by CRISPR/Cas9 gene editing revealed an early larval phenotype with eye malformations, loss of vision, increased photokinetics and hyperpigmentation, without visible skeletal involvement. Ultrastructural analysis of the eyes showed a smaller condensed lens, loss of integrity of the lens capsule with formation of a secondary lens and hyperplasia of the cells in the ganglion and inner plexiform layers of the retina. Transcriptomic analysis pointed to an impaired lens development with aberrant expression of many of the crystallin and other lens-specific genes. Furthermore, the phototransduction and visual perception pathways were found to be significantly disturbed. Differences in light perception are likely the cause of the increased dark photokinetics and generalized hyperpigmentation observed in this zebrafish model. In conclusion, this study validates TAPT1 as a new gene for early-onset cataract and sheds light on its ultrastructural and molecular characteristics.
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Wishart TFL, Lovicu FJ. Heparan sulfate proteoglycans (HSPGs) of the ocular lens. Prog Retin Eye Res 2023; 93:101118. [PMID: 36068128 DOI: 10.1016/j.preteyeres.2022.101118] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 08/22/2022] [Accepted: 08/24/2022] [Indexed: 11/17/2022]
Abstract
Heparan sulfate proteoglycans (HSPGs) reside in most cells; on their surface, in the pericellular milieu and/or extracellular matrix. In the eye, HSPGs can orchestrate the activity of key signalling molecules found in the ocular environment that promote its development and homeostasis. To date, our understanding of the specific roles played by individual HSPG family members, and the heterogeneity of their associated sulfated HS chains, is in its infancy. The crystalline lens is a relatively simple and well characterised ocular tissue that provides an ideal stage to showcase and model the expression and unique roles of individual HSPGs. Individual HSPG core proteins are differentially localised to eye tissues in a temporal and spatial developmental- and cell-type specific manner, and their loss or functional disruption results in unique phenotypic outcomes for the lens, and other ocular tissues. More recent work has found that different HS sulfation enzymes are also presented in a cell- and tissue-specific manner, and that disruption of these different sulfation patterns affects specific HS-protein interactions. Not surprisingly, these sulfated HS chains have also been reported to be required for lens and eye development, with dysregulation of HS chain structure and function leading to pathogenesis and eye-related phenotypes. In the lens, HSPGs undergo significant and specific changes in expression and function that can drive pathology, or in some cases, promote tissue repair. As master signalling regulators, HSPGs may one day serve as valuable biomarkers, and even as putative targets for the development of novel therapeutics, not only for the eye but for many other systemic pathologies.
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Affiliation(s)
- Tayler F L Wishart
- Molecular and Cellular Biomedicine, School of Medical Sciences, The University of Sydney, NSW, Australia.
| | - Frank J Lovicu
- Molecular and Cellular Biomedicine, School of Medical Sciences, The University of Sydney, NSW, Australia; Save Sight Institute, The University of Sydney, NSW, Australia.
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Amiruddin Hashmi M, Kausar T, Alam Khan M, Younus H. Assessing the inhibition of glycation of ζ-crystallin by thymoquinone: A mechanistic approach using experimental and computational methods. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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Abstract
Purpose: Presbyopia-the progressive loss of near focus with age-is primarily a result of changes in lens biomechanics. In particular, the shape of the ocular lens in the absence of zonular tension changes significantly throughout adulthood. Contributors to this change in shape are changes in lens biomechanical properties, continuous volumetric growth lens, and possibly remodeling of the lens capsule. Knowledge in this area is growing rapidly, so the purpose of this mini-review was to summarize and synthesize these gains.Methods: We review the recent literature in this field.Results: The mechanisms governing age-related changes in biomechanical properties remains unknown. We have recently shown that lens growth may be driven by zonular tension. The same mechanobiological mechanism driving lens growth may also lead to remodeling of the capsule, though this remains to be demonstrated.Conclusions: This mini-review focuses on identifying mechanisms which cause these age-related changes, suggesting future work which may elucidate these mechanisms, and briefly discusses ongoing efforts to develop a non-surgical approach for therapeutic management of presbyopia. We also propose a simple model linking lens growth and biomechanical properties.
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Affiliation(s)
- Wade Rich
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Matthew A Reilly
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA.,Department of Ophthalmology & Visual Sciences, The Ohio State University, Columbus, OH, USA
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Darian-Smith E, Safran SG, Coroneo MT. Zonular and capsular bag disorders: a hypothetical perspective based on recent pathophysiological insights. J Cataract Refract Surg 2023; 49:207-212. [PMID: 36700888 DOI: 10.1097/j.jcrs.0000000000001098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 11/13/2022] [Indexed: 01/27/2023]
Abstract
The purpose of this article was to look at the pathophysiology behind and devise a classification system for the causes of zonular apparatus-capsular bag (ZACB) insufficiency. Also discussed is dystrophic bag syndrome, including clinical cases and addressing where it lies on the ZACB spectrum. There has been interest in the emergence of in-the-bag intraocular lens (IOL) subluxation, the prevalence of which is increasing. There has also been a recent report of dead bag syndrome, which the authors believe is part of the same disease spectrum. The authors put these phenomena into perspective and provide a classification system based on the possible causes of what they have termed ZACB insufficiency. The basic aspects of capsular bag-IOL ocular pathophysiology are summarized with a focus on functional aspects and the consequences for IOL fastening. Within this framework, dystrophic bag syndrome is a form of primary capsular ZACB insufficiency. The contribution of factors such as intraocular drugs may suggest a reconsideration of agents used and their mode of application.
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Affiliation(s)
- Erica Darian-Smith
- From the Department of Ophthalmology, Prince of Wales Hospital at University of New South Wales, Sydney, Australia (Darian-Smith, Safran, Coroneo); Sydney University Medical School, Sydney, Australia (Darian-Smith); Capital Health System, New Jersey Surgery Centre, Pennington, New Jersey
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23
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Ranaei Pirmardan E, Zhang Y, Barakat A, Naseri M, Russmann C, Hafezi-Moghadam A. Pre-hyperglycemia immune cell trafficking underlies subclinical diabetic cataractogenesis. J Biomed Sci 2023; 30:6. [PMID: 36694206 PMCID: PMC9872438 DOI: 10.1186/s12929-023-00895-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 01/02/2023] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND This work elucidates the first cellular and molecular causes of cataractogenesis. Current paradigm presupposes elevated blood glucose as a prerequisite in diabetic cataractogenesis. Novel evidence in our model of diabetic cataract challenges this notion and introduces immune cell migration to the lens and epithelial-mesenchymal transformation (EMT) of lens epithelial cells (LECs) as underlying causes. METHODS Paucity of suitable animal models has hampered mechanistic studies of diabetic cataract, as most studies were traditionally carried out in acutely induced hyperglycemic animals. We introduced diabetic cataract in the Nile grass rat (NGR) that spontaneously develops type 2 diabetes (T2D) and showed its closeness to the human condition. Specialized stereo microscopy with dual bright-field illumination revealed novel hyperreflective dot-like microlesions in the inner cortical regions of the lens. To study immune cell migration to the lens, we developed a unique in situ microscopy technique of the inner eye globe in combination with immunohistochemistry. RESULTS Contrary to the existing paradigm, in about half of the animals, the newly introduced hyper reflective dot-like microlesions preceded hyperglycemia. Even though the animals were normoglycemic, we found significant changes in their oral glucose tolerance test (OGTT), indicative of the prediabetic stage. The microlesions were accompanied with significant immune cell migration from the ciliary bodies to the lens, as revealed in our novel in situ microscopy technique. Immune cells adhered to the lens surface, some traversed the lens capsule, and colocalized with apoptotic nuclei of the lens epithelial cells (LECs). Extracellular degradations, amorphous material accumulations, and changes in E-cadherin expressions showed epithelial-mesenchymal transformation (EMT) in LECs. Subsequently, lens fiber disintegration and cataract progression extended into cortical, posterior, and anterior subcapsular cataracts. CONCLUSIONS Our results establish a novel role for immune cells in LEC transformation and death. The fact that cataract formation precedes hyperglycemia challenges the prevailing paradigm that glucose initiates or is necessary for initiation of the pathogenesis. Novel evidence shows that molecular and cellular complications of diabetes start during the prediabetic state. These results have foreseeable ramifications for early diagnosis, prevention and development of new treatment strategies in patients with diabetes.
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Affiliation(s)
- Ehsan Ranaei Pirmardan
- grid.38142.3c000000041936754XMolecular Biomarkers Nano-Imaging Laboratory (MBNI), Brigham and Women’s Hospital, and Department of Radiology, Harvard Medical School, 75 Francis St., Thorn Research Building, Boston, MA 02115 USA
| | - Yuanlin Zhang
- grid.38142.3c000000041936754XMolecular Biomarkers Nano-Imaging Laboratory (MBNI), Brigham and Women’s Hospital, and Department of Radiology, Harvard Medical School, 75 Francis St., Thorn Research Building, Boston, MA 02115 USA
| | - Aliaa Barakat
- grid.38142.3c000000041936754XMolecular Biomarkers Nano-Imaging Laboratory (MBNI), Brigham and Women’s Hospital, and Department of Radiology, Harvard Medical School, 75 Francis St., Thorn Research Building, Boston, MA 02115 USA
| | - Marzieh Naseri
- grid.38142.3c000000041936754XMolecular Biomarkers Nano-Imaging Laboratory (MBNI), Brigham and Women’s Hospital, and Department of Radiology, Harvard Medical School, 75 Francis St., Thorn Research Building, Boston, MA 02115 USA ,grid.67033.310000 0000 8934 4045Department of Developmental, Molecular and Chemical Biology, Tufts University School of Medicine, Boston, MA USA
| | - Christoph Russmann
- grid.38142.3c000000041936754XMolecular Biomarkers Nano-Imaging Laboratory (MBNI), Brigham and Women’s Hospital, and Department of Radiology, Harvard Medical School, 75 Francis St., Thorn Research Building, Boston, MA 02115 USA ,Health Campus Göttingen/University of Applied Sciences and Arts (HAWK), Anna-Strasse 25, 37075 Göttingen, Germany
| | - Ali Hafezi-Moghadam
- grid.38142.3c000000041936754XMolecular Biomarkers Nano-Imaging Laboratory (MBNI), Brigham and Women’s Hospital, and Department of Radiology, Harvard Medical School, 75 Francis St., Thorn Research Building, Boston, MA 02115 USA
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Liu Z, Huang S, Zheng Y, Zhou T, Hu L, Xiong L, Li DWC, Liu Y. The lens epithelium as a major determinant in the development, maintenance, and regeneration of the crystalline lens. Prog Retin Eye Res 2023; 92:101112. [PMID: 36055924 DOI: 10.1016/j.preteyeres.2022.101112] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 07/28/2022] [Accepted: 08/02/2022] [Indexed: 02/01/2023]
Abstract
The crystalline lens is a transparent and refractive biconvex structure formed by lens epithelial cells (LECs) and lens fibers. Lens opacity, also known as cataracts, is the leading cause of blindness in the world. LECs are the principal cells of lens throughout human life, exhibiting different physiological properties and functions. During the embryonic stage, LECs proliferate and differentiate into lens fibers, which form the crystalline lens. Genetics and environment are vital factors that influence normal lens development. During maturation, LECs help maintain lens homeostasis through material transport, synthesis and metabolism as well as mitosis and proliferation. If disturbed, this will result in loss of lens transparency. After cataract surgery, the repair potential of LECs is activated and the structure and transparency of the regenerative tissue depends on postoperative microenvironment. This review summarizes recent research advances on the role of LECs in lens development, homeostasis, and regeneration, with a particular focus on the role of cholesterol synthesis (eg., lanosterol synthase) in lens development and homeostasis maintenance, and how the regenerative potential of LECs can be harnessed to develop surgical strategies and improve the outcomes of cataract surgery (Fig. 1). These new insights suggest that LECs are a major determinant of the physiological and pathological state of the lens. Further studies on their molecular biology will offer possibility to explore new approaches for cataract prevention and treatment.
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Affiliation(s)
- Zhenzhen Liu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, China
| | - Shan Huang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, China
| | - Yingfeng Zheng
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, China
| | - Tian Zhou
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, China
| | - Leyi Hu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, China
| | - Lang Xiong
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, China
| | - David Wan-Cheng Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, China
| | - Yizhi Liu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, 510060, China; Research Unit of Ocular Development and Regeneration, Chinese Academy of Medical Sciences, Beijing, 100085, China.
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Wei Z, Hao C, Chen JK, Gan L, Fan X. A tamoxifen-inducible Cre knock-in mouse for lens-specific gene manipulation. Exp Eye Res 2023; 226:109306. [PMID: 36372215 PMCID: PMC9839650 DOI: 10.1016/j.exer.2022.109306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 11/02/2022] [Accepted: 11/04/2022] [Indexed: 11/13/2022]
Abstract
Mouse models are valuable tools in studying lens biology and biochemistry, and the Cre-loxP system is the most used technology for gene targeting in the lens. However, numerous genes are indispensable in lens development. The conventional knockout method either prevents lens formation or causes simultaneous cataract formation, hindering the studies of their roles in lens structure, growth, metabolism, and cataractogenesis during lens aging. An inducible Cre-loxP mouse line is an excellent way to achieve such a purpose. We established a lens-specific Cre ERT2 knock-in mouse (LCEK), an inducible mouse model for lens-specific gene targeting in a spatiotemporal manner. LCEK mice were created by in-frame infusion of a P2A-CreERT2 at the C-terminus of the last coding exon of the gene alpha A crystallin (Cryaa). LCEK mice express tamoxifen-inducible Cre recombinase uniquely in the lens. Through ROSAmT/mG and two endogenous genes (Gclc and Rbpj) targeting, we found no Cre recombinase leakage in the lens epithelium, but 50-80% leakage was observed in the lens cortex and nucleus. Administration of tamoxifen almost completely abolished target gene expression in both lens epithelium and cortex but only mildly enhanced gene deletion in the lens nucleus. Notably, no overt leakage of Cre activity was detected in developing LCEK lens when bred with mice carrying loxP floxed genes that are essential for lens development. This newly generated LCEK line will be a powerful tool to target genes in the lens for gene functions study in lens aging, posterior capsule opacification (PCO), and other areas requiring precision gene targeting.
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Affiliation(s)
- Zongbo Wei
- Department of Cellular Biology and Anatomy, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Caili Hao
- Department of Cellular Biology and Anatomy, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Jian-Kang Chen
- Department of Cellular Biology and Anatomy, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Lin Gan
- Department of Neuroscience & Regenerative Medicine, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Xingjun Fan
- Department of Cellular Biology and Anatomy, Medical College of Georgia at Augusta University, Augusta, GA, USA.
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26
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The progress in techniques for culturing human limbal epithelial stem cells. Hum Cell 2023; 36:1-14. [PMID: 36181663 DOI: 10.1007/s13577-022-00794-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Accepted: 09/11/2022] [Indexed: 01/07/2023]
Abstract
In vitro culture of human limbal epithelial stem cells (hLESCs) is crucial to cell therapy in the treatment of limbal stem cell deficiency, a potentially vision-threatening disease that is characterized by persistent corneal epithelial defects and corneal epithelium conjunctivalization. Traditionally, hLESCs are cultivated based on either limbal tissue explants or single-cell suspensions in culture media containing xenogenous components, such as fetal bovine serum and murine 3T3 feeder cells. Plastic culture dishes and human amniotic membranes are classical growth substrates used in conventional hLESC culture systems. The past few decades have witnessed considerable progress and innovations in hLESC culture techniques to ensure a higher level of biosafety and lower immunogenicity for further cell treatment, including complete removal of xenogenous components from culture media, the application of human-derived feeder cells, and the development of novel scaffolds. Three-dimensional artificial niches and three-dimensional culture techniques have also been established to simulate the real microenvironment of limbal crypts for better cell outgrowth and proliferation. All these progresses ensure that in vitro cultured hLESCs are more adaptable to translational stem cell therapy for limbal stem cell deficiency.
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Cvekl A, Camerino MJ. Generation of Lens Progenitor Cells and Lentoid Bodies from Pluripotent Stem Cells: Novel Tools for Human Lens Development and Ocular Disease Etiology. Cells 2022; 11:cells11213516. [PMID: 36359912 PMCID: PMC9658148 DOI: 10.3390/cells11213516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 10/31/2022] [Accepted: 11/02/2022] [Indexed: 11/09/2022] Open
Abstract
In vitro differentiation of human pluripotent stem cells (hPSCs) into specialized tissues and organs represents a powerful approach to gain insight into those cellular and molecular mechanisms regulating human development. Although normal embryonic eye development is a complex process, generation of ocular organoids and specific ocular tissues from pluripotent stem cells has provided invaluable insights into the formation of lineage-committed progenitor cell populations, signal transduction pathways, and self-organization principles. This review provides a comprehensive summary of recent advances in generation of adenohypophyseal, olfactory, and lens placodes, lens progenitor cells and three-dimensional (3D) primitive lenses, "lentoid bodies", and "micro-lenses". These cells are produced alone or "community-grown" with other ocular tissues. Lentoid bodies/micro-lenses generated from human patients carrying mutations in crystallin genes demonstrate proof-of-principle that these cells are suitable for mechanistic studies of cataractogenesis. Taken together, current and emerging advanced in vitro differentiation methods pave the road to understand molecular mechanisms of cataract formation caused by the entire spectrum of mutations in DNA-binding regulatory genes, such as PAX6, SOX2, FOXE3, MAF, PITX3, and HSF4, individual crystallins, and other genes such as BFSP1, BFSP2, EPHA2, GJA3, GJA8, LIM2, MIP, and TDRD7 represented in human cataract patients.
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Affiliation(s)
- Aleš Cvekl
- Departments Ophthalmology and Visual Sciences, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Correspondence: ; Tel.: +1-718-430-3217; Fax: +1-718-430-8778
| | - Michael John Camerino
- Departments Ophthalmology and Visual Sciences, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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Meganathan I, Pachaiyappan M, Aarthy M, Radhakrishnan J, Mukherjee S, Shanmugam G, You J, Ayyadurai N. Recombinant and genetic code expanded collagen-like protein as a tailorable biomaterial. MATERIALS HORIZONS 2022; 9:2698-2721. [PMID: 36189465 DOI: 10.1039/d2mh00652a] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Collagen occurs in nature with a dedicated triple helix structure and is the most preferred biomaterial in commercialized medical products. However, concerns on purity, disease transmission, and the reproducibility of animal derived collagen restrict its applications and warrants alternate recombinant sources. The expression of recombinant collagen in different prokaryotic and eukaryotic hosts has been reported with varying degrees of success, however, it is vital to elucidate the structural and biological characteristics of natural collagen. The recombinant production of biologically functional collagen is restricted by its high molecular weight and post-translational modification (PTM), especially the hydroxylation of proline to hydroxyproline. Hydroxyproline plays a key role in the structural stability and higher order self-assembly to form fibrillar matrices. Advancements in synthetic biology and recombinant technology are being explored for improving the yield and biomimicry of recombinant collagen. It emerges as reliable, sustainable source of collagen, promises tailorable properties and thereby custom-made protein biomaterials. Remarkably, the evolutionary existence of collagen-like proteins (CLPs) has been identified in single-cell organisms. Interestingly, CLPs exhibit remarkable ability to form stable triple helical structures similar to animal collagen and have gained increasing attention. Strategies to expand the genetic code of CLPs through the incorporation of unnatural amino acids promise the synthesis of highly tunable next-generation triple helical proteins required for the fabrication of smart biomaterials. The review outlines the importance of collagen, sources and diversification, and animal and recombinant collagen-based biomaterials and highlights the limitations of the existing collagen sources. The emphasis on genetic code expanded tailorable CLPs as the most sought alternate for the production of functional collagen and its advantages as translatable biomaterials has been highlighted.
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Affiliation(s)
- Ilamaran Meganathan
- Division of Biochemistry and Biotechnology, Council of Scientific and Industrial Research (CSIR) - CLRI, Chennai, India.
| | - Mohandass Pachaiyappan
- Division of Biochemistry and Biotechnology, Council of Scientific and Industrial Research (CSIR) - CLRI, Chennai, India.
| | - Mayilvahanan Aarthy
- Division of Biochemistry and Biotechnology, Council of Scientific and Industrial Research (CSIR) - CLRI, Chennai, India.
| | - Janani Radhakrishnan
- Division of Biochemistry and Biotechnology, Council of Scientific and Industrial Research (CSIR) - CLRI, Chennai, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Smriti Mukherjee
- Division of Organic and Bio-organic Chemistry, Council of Scientific and Industrial Research (CSIR) - CLRI, Chennai, India
| | - Ganesh Shanmugam
- Division of Organic and Bio-organic Chemistry, Council of Scientific and Industrial Research (CSIR) - CLRI, Chennai, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Jingjing You
- Save Sight Institute, Sydney Medical School, University of Sydney, Australia
| | - Niraikulam Ayyadurai
- Division of Biochemistry and Biotechnology, Council of Scientific and Industrial Research (CSIR) - CLRI, Chennai, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
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Murillo SA, Romero RM, Medina SP. Bilaminar Graft of the Anterior Capsule and Internal Limiting Membrane: A Novel Surgical Technique for the Treatment of Macular Hole and Focal Macular Detachment Associated with High Myopia and Posterior Staphyloma. Case Rep Ophthalmol 2022; 13:783-788. [PMID: 36845456 PMCID: PMC9944213 DOI: 10.1159/000526151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Accepted: 07/19/2022] [Indexed: 11/19/2022] Open
Abstract
This case report describes a novel surgical technique for the treatment of macular hole and focal macular detachment associated with high myopia and posterior staphyloma. A 65-year-old female presented with a stage 3C myopic traction maculopathy and VA of 20/600. OCT examination confirmed a macular hole of 958 μm diameter, posterior staphyloma, and macular detachment. We performed combined phacoemulsification surgery with 23G pars plana vitrectomy; the anterior capsule was preserved and divided into two equal circular laminar flaps. We proceeded with central and peripheral vitrectomy, brilliant blue staining, and partial ILM peeling; capsular sheets were introduced sequentially in the vitreous chamber, the first one was implanted below the hole and attached to pigment epithelium, the second lamina was inserted into the hole, and the remaining portion of ILM was implanted crosswise below the edges of the hole. Macular-hole closure and progressive reapplication of the macular detachment were obtained, with a final VA of 20/80. Treatment of macular holes and focal macular detachment in high myopic eyes is complex, even for experienced surgeons. We propose a new technique with additional mechanisms based on anterior lens capsule and internal limiting membrane tissue properties that showed functional and anatomical improvement and could be considered an alternative treatment.
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Affiliation(s)
| | - Rosa Maria Romero
- bCentro de Investigación de Enfermedades Infecciosas (CIENI), Instituto Nacional de Enfermedades Respiratorias (INER), Mexico City, Mexico,*Rosa Maria Romero,
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30
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Zheng Y, Lin C, Guang C, Han S, Ma K, Yang Y. Operation behaviours of surgical forceps in continuous curvilinear capsulorhexis. Int J Med Robot 2022; 18:e2424. [DOI: 10.1002/rcs.2424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 05/07/2022] [Accepted: 05/12/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Yu Zheng
- School of Mechanical Engineering and Automation Beihang University Beijing People's Republic of China
| | - Chuang Lin
- School of Mechanical Engineering and Automation Beihang University Beijing People's Republic of China
| | - Chenhan Guang
- School of Mechanical Engineering and Automation Beihang University Beijing People's Republic of China
| | - Shaofeng Han
- School of Energy Power and Mechanical Engineering North China Electric Power University Beijing People's Republic of China
| | - Ke Ma
- Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical University Beijing People's Republic of China
| | - Yang Yang
- School of Mechanical Engineering and Automation Beihang University Beijing People's Republic of China
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31
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Zhang L, Qin Z, Lyu D, Lu B, Chen Z, Fu Q, Yao K. Postponement of the opacification of lentoid bodies derived from human induced pluripotent stem cells after lanosterol treatment—the first use of the lens aging model in vitro in cataract drug screening. Front Pharmacol 2022; 13:959978. [PMID: 36059984 PMCID: PMC9437520 DOI: 10.3389/fphar.2022.959978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 07/18/2022] [Indexed: 11/17/2022] Open
Abstract
Purpose: Our previous study observed that human induced pluripotent stem cell (HiPSC)-derived lentoid bodies (LBs) became cloudy with extended culture time, partially mimicking the progress of human age-related cataracts (ARCs) in a dish. In the present study, lanosterol, a potential anticataract drug, was used to further verify the value of this model in drug screening for cataract treatment. Methods: Mature LBs on day 25, which were differentiated from HiPSCs using the “fried egg” method, were continually cultured and treated with either dimethyl sulfoxide (control) or lanosterol. The LBs’ shape and opacity alterations were examined using light microscopy and mean gray value evaluation. The soluble and insoluble proteins were examined through SDS-PAGE gel electrophoresis combined with Coomassie blue staining. The protein aggregations were examined with immunofluorescence. Results: The mature LBs became cloudy with an extended culture time, and the opacification of the LBs was partially prevented by lanosterol treatment. There was less increase in insoluble proteins in the lanosterol-treated LBs than in the control group. There were also fewer cells containing aggregated protein (αA‐crystallin and αB‐crystallin) puncta in the lanosterol-treated LBs than in the control LBs. Conclusion: It was found that the opacification of LBs could be delayed by lanosterol treatment, which could be achieved by reducing protein aggregation, suggesting a promising HiPSC-derived drug-screening model for Age-related cataract.
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Affiliation(s)
- Lifang Zhang
- Eye Center of the 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, China
- Department of Ophthalmology, The Affiliated People’s Hospital of Ningbo University, Ningbo, China
| | - Zhenwei Qin
- Eye Center of the 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, China
| | - Danni Lyu
- Eye Center of the 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, China
| | - Bing Lu
- Eye Center of the 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, China
| | - Zhijian Chen
- Department of Environmental and Occupational Health, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, China
| | - Qiuli Fu
- Eye Center of the 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, China
- *Correspondence: Ke Yao, ; Qiuli Fu,
| | - Ke Yao
- Eye Center of the 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, China
- *Correspondence: Ke Yao, ; Qiuli Fu,
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32
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Thomas CN, Alfahad N, Capewell N, Cowley J, Hickman E, Fernandez A, Harrison N, Qureshi OS, Bennett N, Barnes NM, Dick AD, Chu CJ, Liu X, Denniston AK, Vendrell M, Hill LJ. Triazole-derivatized near-infrared cyanine dyes enable local functional fluorescent imaging of ocular inflammation. Biosens Bioelectron 2022; 216:114623. [PMID: 36029662 DOI: 10.1016/j.bios.2022.114623] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 07/28/2022] [Accepted: 08/03/2022] [Indexed: 11/26/2022]
Abstract
Near-infrared (NIR) chemical fluorophores are promising tools for in-vivo imaging in real time but often succumb to rapid photodegradation. Indocyanine green (ICG) is the only NIR dye with regulatory approval for ocular imaging in humans; however, ICG, when employed for applications such as labelling immune cells, has limited sensitivity and does not allow precise detection of specific inflammatory events, for example leukocyte recruitment during uveitic flare-ups. We investigated the potential use of photostable novel triazole NIR cyanine (TNC) dyes for detecting and characterising activated T-cell activity within the eye. Three TNC dyes were evaluated for ocular cytotoxicity in-vitro using a MTT assay and optimised concentrations for intraocular detection within ex-vivo porcine eyes after topical application or intracameral injections of the dyes. TNC labelled T-cell tracking experiments and mechanistic studies were also performed in-vitro. TNC-1 and TNC-2 dyes exhibited greater fluorescence intensity than ICG at 10 μM, whereas TNC-3 was only detectable at 100 μM within the porcine eye. TNC dyes did not demonstrate any ocular cell toxicity at working concentrations of 10 μM. CD4+T-cells labelled with TNC-1 or TNC-2 were detected within the porcine eye, with TNC-1 being brighter than TNC-2. Detection of TNC-1 and TNC-2 into CD4+T-cells was prevented by prior incubation with dynole 34-2 (50 μM), suggesting active uptake of these dyes via dynamin-dependent processes. The present study provides evidence that TNC dyes are suitable to detect activated CD4+T-cells within the eye with potential as a diagnostic marker for ocular inflammatory diseases.
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Affiliation(s)
- Chloe N Thomas
- School of Biomedical Sciences, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK.
| | - Nada Alfahad
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - Nicholas Capewell
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Jamie Cowley
- Celentyx Ltd, Birmingham Research Park, Vincent Drive, Edgbaston, Birmingham, UK
| | - Eleanor Hickman
- School of Biomedical Sciences, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Antonio Fernandez
- Department of Organic Chemistry, Faculty of Chemistry, University of Murcia, Murcia, Spain; Centre for Inflammation Research, Queen's Medical Research Institute, The University of Edinburgh, Edinburgh, UK
| | - Neale Harrison
- Celentyx Ltd, Birmingham Research Park, Vincent Drive, Edgbaston, Birmingham, UK
| | - Omar S Qureshi
- Celentyx Ltd, Birmingham Research Park, Vincent Drive, Edgbaston, Birmingham, UK
| | - Naomi Bennett
- School of Biomedical Sciences, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK; Healthcare Technologies Institute, School of Chemical Engineering, University of Birmingham, Birmingham, UK
| | - Nicholas M Barnes
- Neuropharmacology Research Group, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Andrew D Dick
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital and University College London Institute of Ophthalmology, London, UK; Academic Unit of Ophthalmology, Bristol Medical School and School of Cellular and Molecular Medicine, University of Bristol, Bristol, UK
| | - Colin J Chu
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital and University College London Institute of Ophthalmology, London, UK; Academic Unit of Ophthalmology, Bristol Medical School and School of Cellular and Molecular Medicine, University of Bristol, Bristol, UK
| | - Xiaoxuan Liu
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK; University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK; Birmingham Health Partners Centre for Regulatory Science and Innovation, University of Birmingham, Birmingham, UK; Health Data Research UK, London, UK
| | - Alastair K Denniston
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK; University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK; National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital and University College London Institute of Ophthalmology, London, UK; Birmingham Health Partners Centre for Regulatory Science and Innovation, University of Birmingham, Birmingham, UK; Health Data Research UK, London, UK; Centre for Patient Reported Outcomes Research, Institute of Applied Health Research, University of Birmingham, Birmingham, UK
| | - Marc Vendrell
- Centre for Inflammation Research, Queen's Medical Research Institute, The University of Edinburgh, Edinburgh, UK
| | - Lisa J Hill
- School of Biomedical Sciences, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK.
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33
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Hirata A, Mine K, Hayashi K. Age-related appearance of lamellar structures in lens capsule of cataractous eyes and its pathological significance. J Cataract Refract Surg 2022; 48:844-849. [PMID: 35537866 DOI: 10.1097/j.jcrs.0000000000000967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Accepted: 05/05/2022] [Indexed: 11/26/2022]
Abstract
PURPOSE To determine morphological changes in the lens capsule with aging. SETTING Hayashi Eye Hospital, Fukuoka, Japan. DESIGN Cross-sectional study. METHODS 25 eyes from the older patient group (aged 80 years or older) and 25 eyes from the younger patient group (aged 65 years or younger) who were diagnosed with cataract and indicated for surgery were included in the study. After continuous curvilinear capsulorhexis, the anterior lens capsule was collected, immediately fixed, and processed for electron microscopy analysis. Backscattered electron images of the cross-section of the anterior lens capsule were observed under a scanning electron microscope. The ultrastructure of the anterior lens capsule was observed and compared between the groups. Factors associated with the occurrence of the lamellar structure were also identified, with the presence or absence of a lamellar structure as an objective variable and preoperative clinical characteristics as the explanatory variables. RESULTS 50 eyes of 50 patients were included. In the younger patient group, 20 eyes (80%) had a homogeneous lens capsule, whereas 5 eyes had lamellar structures. By contrast, in the older patient group, 5 eyes had homogeneous structures, while the remaining 20 eyes (80%) had lamellar structures. 1 eye showed capsular delamination. The only significant factor for the occurrence of lamellar structures was age group ( P < .01, nominal logistic regression analysis). CONCLUSIONS Lamellar structures appear in the anterior capsule during aging. The appearance of lamellar structures indicates fragility of the lens capsule, which may, in turn, lead to capsular delamination or lens dislocation in some cases.
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Affiliation(s)
- Akira Hirata
- From the Hayashi Eye Hospital, Fukuoka, Japan (Hirata, Mine, Hayashi); Department of Anatomy, Kurume University School of Medicine, Kurume, Japan (Hirata)
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34
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Glazier AN. Proposed Role for Internal Lens Pressure as an Initiator of Age-Related Lens Protein Aggregation Diseases. Clin Ophthalmol 2022; 16:2329-2340. [PMID: 35924184 PMCID: PMC9342656 DOI: 10.2147/opth.s369676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 07/13/2022] [Indexed: 11/23/2022] Open
Abstract
The process that initiates lens stiffness evident in age-related lens protein aggregation diseases is thought to be mainly the result of oxidation. While oxidation is a major contributor, the exposure of lens proteins to physical stress over time increases susceptibility of lens proteins to oxidative damage, and this is believed to play a significant role in initiating these diseases. Accordingly, an overview of key physical stressors and molecular factors known to be implicated in the development of age-related lens protein aggregation diseases is presented, paying particular attention to the consequence of persistent increase in internal lens pressure.
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Affiliation(s)
- Alan N Glazier
- Optometry, KeplrVision, Rockville, MD, USA
- Correspondence: Alan N Glazier, Email
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35
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Ruiss M, Findl O, Kronschläger M. The human lens: An antioxidant-dependent tissue revealed by the role of caffeine. Ageing Res Rev 2022; 79:101664. [PMID: 35690384 DOI: 10.1016/j.arr.2022.101664] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 05/24/2022] [Accepted: 06/04/2022] [Indexed: 11/01/2022]
Abstract
Cataract is the leading cause of blindness worldwide and surgery is the only option to treat the disease. Although the surgery is considered to be relatively safe, complications may occur in a subset of patients and access to ophthalmic care may be limited. Due to a growing and ageing population, an increase in cataract prevalence is expected and its management will become a socioeconomic challenge. Hence, there is a need for an alternative to cataract surgery. It is well known that oxidative stress is one of the main pathological processes leading to the generation of the disease. Antioxidant supplementation may, therefore, be a strategy to delay or to prevent the progression of cataract. Caffeine is a widely consumed high-potency antioxidant and may be of interest for the prevention of the disease. This review aims to give an overview of the anatomy and function of the lens, its antioxidant and reactive oxygen species (ROS) composition, and the role of oxidative stress in cataractogenesis. Also, the pharmacokinetics and -dynamics of caffeine will be described and the literature will be reviewed to give an overview of its anti-cataract potential and its possible role in the prevention of the disease.
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Affiliation(s)
- Manuel Ruiss
- Vienna Institute for Research in Ocular Surgery (VIROS), a Karl Landsteiner Institute, Department of Ophthalmology, Hanusch Hospital, Vienna 1140 Austria.
| | - Oliver Findl
- Vienna Institute for Research in Ocular Surgery (VIROS), a Karl Landsteiner Institute, Department of Ophthalmology, Hanusch Hospital, Vienna 1140 Austria.
| | - Martin Kronschläger
- Vienna Institute for Research in Ocular Surgery (VIROS), a Karl Landsteiner Institute, Department of Ophthalmology, Hanusch Hospital, Vienna 1140 Austria.
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Taiyab A, West-Mays J. Lens Fibrosis: Understanding the Dynamics of Cell Adhesion Signaling in Lens Epithelial-Mesenchymal Transition. Front Cell Dev Biol 2022; 10:886053. [PMID: 35656546 PMCID: PMC9152183 DOI: 10.3389/fcell.2022.886053] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 04/11/2022] [Indexed: 12/13/2022] Open
Abstract
Injury to the ocular lens perturbs cell-cell and cell-capsule/basement membrane interactions leading to a myriad of interconnected signaling events. These events include cell-adhesion and growth factor-mediated signaling pathways that can ultimately result in the induction and progression of epithelial-mesenchymal transition (EMT) of lens epithelial cells and fibrosis. Since the lens is avascular, consisting of a single layer of epithelial cells on its anterior surface and encased in a matrix rich capsule, it is one of the most simple and desired systems to investigate injury-induced signaling pathways that contribute to EMT and fibrosis. In this review, we will discuss the role of key cell-adhesion and mechanotransduction related signaling pathways that regulate EMT and fibrosis in the lens.
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37
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Chakravarti S, Enzo E, de Barros MRM, Maffezzoni MBR, Pellegrini G. Genetic Disorders of the Extracellular Matrix: From Cell and Gene Therapy to Future Applications in Regenerative Medicine. Annu Rev Genomics Hum Genet 2022; 23:193-222. [PMID: 35537467 DOI: 10.1146/annurev-genom-083117-021702] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Metazoans have evolved to produce various types of extracellular matrix (ECM) that provide structural support, cell adhesion, cell-cell communication, and regulated exposure to external cues. Epithelial cells produce and adhere to a specialized sheet-like ECM, the basement membrane, that is critical for cellular homeostasis and tissue integrity. Mesenchymal cells, such as chondrocytes in cartilaginous tissues and keratocytes in the corneal stroma, produce a pericellular matrix that presents optimal levels of growth factors, cytokines, chemokines, and nutrients to the cell and regulates mechanosensory signals through specific cytoskeletal and cell surface receptor interactions. Here, we discuss laminins, collagen types IV and VII, and perlecan, which are major components of these two types of ECM. We examine genetic defects in these components that cause basement membrane pathologies such as epidermolysis bullosa, Alport syndrome, rare pericellular matrix-related chondrodysplasias, and corneal keratoconus and discuss recent advances in cell and gene therapies being developed for some of these disorders. Expected final online publication date for the Annual Review of Genomics and Human Genetics, Volume 23 is October 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Shukti Chakravarti
- Department of Ophthalmology and Department of Pathology, Grossman School of Medicine, New York University, New York, NY, USA; ,
| | - Elena Enzo
- Center for Regenerative Medicine "Stefano Ferrari," University of Modena and Reggio Emilia, Modena, Italy; , ,
| | - Maithê Rocha Monteiro de Barros
- Department of Ophthalmology and Department of Pathology, Grossman School of Medicine, New York University, New York, NY, USA; ,
| | | | - Graziella Pellegrini
- Center for Regenerative Medicine "Stefano Ferrari," University of Modena and Reggio Emilia, Modena, Italy; , ,
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An Ex Vivo Study on Release, Uptake, and miRNA Profile of Exosomes in Rat Lens. J Ophthalmol 2022; 2022:6706172. [PMID: 35496773 PMCID: PMC9050248 DOI: 10.1155/2022/6706172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 03/14/2022] [Accepted: 04/06/2022] [Indexed: 11/17/2022] Open
Abstract
Purpose To identify the ability of releasing and uptaking exosomes in rat lens and characterize the exosomal microRNA profile of lens-derived exosomes. Methods The rat lenses were cultured ex vivo and the medium was collected. The exosomes were isolated from medium and measured in size and concentration by nanoflow cytometry (nFCM) and transmission electron microscopy (TEM) and verified with CD63 and TSG101 by Western blot. The miRNAs in exosomes released from lens epithelial cells (LECs) were sequenced. The plasma exosomes labeled by PKH26 were used to verify the exosomes uptake LECs, and their colocalized fluorescence was imaged by confocal microscopy. Results LECs released numerous exosomes into the medium through the capsule, which contained abundant miRNAs. The most abundant miRNAs included miR-184, let-7c-5p, let-7a-5p, let-7b-5p, let-7f-5p, miR-125a-5p, miR-204-5p, miR-125b-5p, miR-1b, and miR-23a-3p. The LECs but not the lens fibre cells showed exosome uptake. The LECs uptake more PKH26-labeled exosomes at day 7 than day 3 and day 14. Conclusions Our results suggested that LECs can release and uptake exosomes through the capsule. Exosomes may be an important way for the lens to communicate among LECs, aqueous humour, vitreous body, and other ocular tissues.
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The dead bag syndrome. J Cataract Refract Surg 2022; 48:517-518. [PMID: 35703837 DOI: 10.1097/j.jcrs.0000000000000930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Dawson VJ, Patnaik JL, Wildes M, Bonnell LN, Miller DC, Taravella MJ, Lynch AM, Christopher KL. Risk of posterior capsule rupture in patients with type 2 diabetes mellitus and diabetic retinopathy during phacoemulsification cataract surgery. Acta Ophthalmol 2022; 100:813-818. [PMID: 35253993 DOI: 10.1111/aos.15121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 01/19/2022] [Accepted: 02/18/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Valerie J. Dawson
- Department of Ophthalmology University of Colorado School of Medicine Aurora Colorado USA
| | - Jennifer L. Patnaik
- Department of Ophthalmology University of Colorado School of Medicine Aurora Colorado USA
| | - Michael Wildes
- Department of Ophthalmology University of Colorado School of Medicine Aurora Colorado USA
| | - Levi N. Bonnell
- Department of Ophthalmology University of Colorado School of Medicine Aurora Colorado USA
| | - D. Claire Miller
- Department of Ophthalmology University of Colorado School of Medicine Aurora Colorado USA
| | - Michael J. Taravella
- Department of Ophthalmology University of Colorado School of Medicine Aurora Colorado USA
| | - Anne M. Lynch
- Department of Ophthalmology University of Colorado School of Medicine Aurora Colorado USA
| | - Karen L. Christopher
- Department of Ophthalmology University of Colorado School of Medicine Aurora Colorado USA
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Bailey MHJ, Wilson M. Simulation of defects, flexibility and rupture in biopolymer networks. RSC Adv 2022; 12:2171-2180. [PMID: 35425240 PMCID: PMC8979039 DOI: 10.1039/d1ra07262e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 12/14/2021] [Indexed: 11/30/2022] Open
Abstract
Networks of biopolymers occur often in nature, and are vulnerable to damage over time. In this work, a coarse grained model of collagen IV molecules is applied in a 2D hexagonal network and the mechanisms by which these networks can rupture are explored. The networks are stretched linearly in order to study their structural limits and mechanism of rupture over timescale of up to 100 μs. Metrics are developed to track the damage networks suffer over time, and qualitatively analyse ruptures that occur. Further simulations repeatedly stretch the networks sinusoidally to mimic the in vivo strains. Defects of increasing levels of complexity are introduced into an ordered network, and their effect on the rupturing behaviour of the biopolymer networks studied. The effect of introducing holes of varying size in the network, as well as strips of finite width to mimic surgical damage are studied. These demonstrate the importance of the flexibility of the networks to preventing damage. We use a coarse grained polymer model and a simple graph representation to introduce defects into a biopolymer network, then cause them to rupture.![]()
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Affiliation(s)
- Matthew H J Bailey
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford South Parks Road Oxford OX1 3QZ UK
| | - Mark Wilson
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford South Parks Road Oxford OX1 3QZ UK
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Vigneux G, Pirkkanen J, Laframboise T, Prescott H, Tharmalingam S, Thome C. Radiation-Induced Alterations in Proliferation, Migration, and Adhesion in Lens Epithelial Cells and Implications for Cataract Development. Bioengineering (Basel) 2022; 9:29. [PMID: 35049738 PMCID: PMC8772889 DOI: 10.3390/bioengineering9010029] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/07/2022] [Accepted: 01/10/2022] [Indexed: 12/21/2022] Open
Abstract
The lens of the eye is one of the most radiosensitive tissues. Although the exact mechanism of radiation-induced cataract development remains unknown, altered proliferation, migration, and adhesion have been proposed as factors. Lens epithelial cells were exposed to X-rays (0.1-2 Gy) and radiation effects were examined after 12 h and 7 day. Proliferation was quantified using an MTT assay, migration was measured using a Boyden chamber and wound-healing assay, and adhesion was assessed on three extracellular matrices. Transcriptional changes were also examined using RT-qPCR for a panel of genes related to these processes. In general, a nonlinear radiation response was observed, with the greatest effects occurring at a dose of 0.25 Gy. At this dose, a reduction in proliferation occurred 12 h post irradiation (82.06 ± 2.66%), followed by an increase at 7 day (116.16 ± 3.64%). Cell migration was increased at 0.25 Gy, with rates 121.66 ± 6.49% and 232.78 ± 22.22% greater than controls at 12 h and 7 day respectively. Cell adhesion was consistently reduced above doses of 0.25 Gy. Transcriptional alterations were identified at these same doses in multiple genes related to proliferation, migration, and adhesion. Overall, this research began to elucidate the functional changes that occur in lens cells following radiation exposure, thereby providing a better mechanistic understanding of radiation-induced cataract development.
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Affiliation(s)
- Graysen Vigneux
- Biomolecular Sciences Program, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada; (G.V.); (S.T.)
| | - Jake Pirkkanen
- Department of Biology, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada; (J.P.); (T.L.); (H.P.)
- Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada
| | - Taylor Laframboise
- Department of Biology, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada; (J.P.); (T.L.); (H.P.)
- Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada
| | - Hallie Prescott
- Department of Biology, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada; (J.P.); (T.L.); (H.P.)
| | - Sujeenthar Tharmalingam
- Biomolecular Sciences Program, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada; (G.V.); (S.T.)
- Department of Biology, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada; (J.P.); (T.L.); (H.P.)
- Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada
- Nuclear Innovation Institute, 620 Tomlinson Drive, Port Elgin, ON N0H 2C0, Canada
| | - Christopher Thome
- Biomolecular Sciences Program, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada; (G.V.); (S.T.)
- Department of Biology, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada; (J.P.); (T.L.); (H.P.)
- Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada
- Nuclear Innovation Institute, 620 Tomlinson Drive, Port Elgin, ON N0H 2C0, Canada
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Avetisov SE, Shitikova AV, Avetisov KS. [Anatomical, morphological and biomechanical aspects of accommodation]. Vestn Oftalmol 2022; 138:117-125. [PMID: 36004600 DOI: 10.17116/oftalma2022138041117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The article reviews the findings on the anatomy, morphological and biomechanical features of the accommodation apparatus. Modern methods of imaging and biometry confirm the validity of the Helmholtz lenticular theory of accommodation, according to which its mechanism involves three main components: the ciliary body, the zonular fibres and the lens capsule, the lens itself. Based on this, there is certain interest in studying the degree of participation of each of these components in the development of age-related changes in accommodation (presbyopia).
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Affiliation(s)
- S E Avetisov
- Research Institute of Eye Disease, Moscow, Russia
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
| | | | - K S Avetisov
- Research Institute of Eye Disease, Moscow, Russia
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44
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Hidalgo-Alvarez V, Dhowre HS, Kingston OA, Sheridan CM, Levis HJ. Biofabrication of Artificial Stem Cell Niches in the Anterior Ocular Segment. Bioengineering (Basel) 2021; 8:135. [PMID: 34677208 PMCID: PMC8533470 DOI: 10.3390/bioengineering8100135] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/27/2021] [Accepted: 09/27/2021] [Indexed: 11/16/2022] Open
Abstract
The anterior segment of the eye is a complex set of structures that collectively act to maintain the integrity of the globe and direct light towards the posteriorly located retina. The eye is exposed to numerous physical and environmental insults such as infection, UV radiation, physical or chemical injuries. Loss of transparency to the cornea or lens (cataract) and dysfunctional regulation of intra ocular pressure (glaucoma) are leading causes of worldwide blindness. Whilst traditional therapeutic approaches can improve vision, their effect often fails to control the multiple pathological events that lead to long-term vision loss. Regenerative medicine approaches in the eye have already had success with ocular stem cell therapy and ex vivo production of cornea and conjunctival tissue for transplant recovering patients' vision. However, advancements are required to increase the efficacy of these as well as develop other ocular cell therapies. One of the most important challenges that determines the success of regenerative approaches is the preservation of the stem cell properties during expansion culture in vitro. To achieve this, the environment must provide the physical, chemical and biological factors that ensure the maintenance of their undifferentiated state, as well as their proliferative capacity. This is likely to be accomplished by replicating the natural stem cell niche in vitro. Due to the complex nature of the cell microenvironment, the creation of such artificial niches requires the use of bioengineering techniques which can replicate the physico-chemical properties and the dynamic cell-extracellular matrix interactions that maintain the stem cell phenotype. This review discusses the progress made in the replication of stem cell niches from the anterior ocular segment by using bioengineering approaches and their therapeutic implications.
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Affiliation(s)
- Veronica Hidalgo-Alvarez
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK
| | - Hala S. Dhowre
- Department of Eye and Vision Science, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool L7 8TX, UK; (H.S.D.); (O.A.K.)
| | - Olivia A. Kingston
- Department of Eye and Vision Science, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool L7 8TX, UK; (H.S.D.); (O.A.K.)
| | - Carl M. Sheridan
- Department of Eye and Vision Science, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool L7 8TX, UK; (H.S.D.); (O.A.K.)
| | - Hannah J. Levis
- Department of Eye and Vision Science, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool L7 8TX, UK; (H.S.D.); (O.A.K.)
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45
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Patel SD, Aryal S, Mennetti LP, Parreno J. Whole mount staining of lenses for visualization of lens epithelial cell proteins. MethodsX 2021; 8:101376. [PMID: 34430272 PMCID: PMC8374519 DOI: 10.1016/j.mex.2021.101376] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 04/26/2021] [Indexed: 11/17/2022] Open
Abstract
Whole mount imaging of the lens allows for high spatial resolution visualization of lens epithelial structures by using small molecule fluorescent probes. However, the visualization of specific proteins in lens epithelial cells within whole lenses remains a challenge as the capsule that surrounds the lens does not allow penetration of antibodies. Here we describe a whole mount imaging method that allows us to overcome this challenge by digesting the lens capsules of paraformaldehyde fixed lenses using collagenase. This method enables the penetration of antibodies for effective visualization of proteins in the epithelium of whole lenses.A limitation to lens whole mount imaging is the ability to visualize specific proteins as the collagen capsule surrounding the lens impedes the penetration of antibodies This protocol helps overcome this limitation by a light collagenase digestion of the capsule of fixed lenses prior to immunostaining This method allows for the imaging of specific proteins in the epithelium of the whole lens tissue
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Affiliation(s)
- Shaili D Patel
- Department of Biological Sciences, University of Delaware USA
| | - Sandeep Aryal
- Department of Biological Sciences, University of Delaware USA
| | | | - Justin Parreno
- Department of Biological Sciences, University of Delaware USA
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46
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Song Y, Overmass M, Fan J, Hodge C, Sutton G, Lovicu FJ, You J. Application of Collagen I and IV in Bioengineering Transparent Ocular Tissues. Front Surg 2021; 8:639500. [PMID: 34513910 PMCID: PMC8427501 DOI: 10.3389/fsurg.2021.639500] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 07/26/2021] [Indexed: 12/13/2022] Open
Abstract
Collagens represent a major group of structural proteins expressed in different tissues and display distinct and variable properties. Whilst collagens are non-transparent in the skin, they confer transparency in the cornea and crystalline lens of the eye. There are 28 types of collagen that all share a common triple helix structure yet differ in the composition of their α-chains leading to their different properties. The different organization of collagen fibers also contributes to the variable tissue morphology. The important ability of collagen to form different tissues has led to the exploration and application of collagen as a biomaterial. Collagen type I (Col-I) and collagen type IV (Col-IV) are the two primary collagens found in corneal and lens tissues. Both collagens provide structure and transparency, essential for a clear vision. This review explores the application of these two collagen types as novel biomaterials in bioengineering unique tissue that could be used to treat a variety of ocular diseases leading to blindness.
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Affiliation(s)
- Yihui Song
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Morgan Overmass
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Jiawen Fan
- Key Laboratory of Myopia of State Health Ministry, Department of Ophthalmology and Vision Sciences, Eye and Ear, Nose, and Throat (ENT) Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Chris Hodge
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
- New South Wales (NSW) Tissue Bank, Sydney, NSW, Australia
- Vision Eye Institute, Chatswood, NSW, Australia
| | - Gerard Sutton
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
- New South Wales (NSW) Tissue Bank, Sydney, NSW, Australia
- Vision Eye Institute, Chatswood, NSW, Australia
| | - Frank J. Lovicu
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
- Discipline of Anatomy and Histology, School of Medical Sciences, The University of Sydney, Sydney, NSW, Australia
| | - Jingjing You
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
- School of Optometry and Vision Science, University of New South Wales, Sydney, NSW, Australia
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47
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Jaitli A, Roy J, Chatila A, Liao J, Tang L. Effect of time and temperature-dependent changes of IOL material properties on IOL: Lens capsule interactions. Exp Eye Res 2021; 211:108726. [PMID: 34403680 DOI: 10.1016/j.exer.2021.108726] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 08/05/2021] [Accepted: 08/09/2021] [Indexed: 11/15/2022]
Abstract
Posterior Capsule Opacification (PCO) is the most common complication associated with Intraocular Lens (IOL) implantation. Based on the assumption that the interactions between an IOL and the lens capsule (LC) may influence the extent of PCO formation, a new in vitro model was developed to quantify the adhesion force of an IOL to simulated LC using a custom-designed micro-force tester. Using this system, we examined the influence of temperature (room temperature vs. body temperature) and incubation time (0 vs. 24 h) on the adhesion force between IOLs and LCs. The results show that, in line with clinical observations of PCO incidence, the adhesion force increased at body temperature and with increase in incubation time in the following order, Acrylic foldable IOLs > Silicone IOLs > PMMA IOLs. By examining the changes of surface properties as a function of temperature and incubation time, we found that acrylic foldable IOLs showed the largest increase in their hydrophilicity and reported the lowest surface roughness in comparison to other IOL groups. Coincidentally, using a newly established macromolecular dye imaging system to simulate cell migration between IOLs and LC, we observed that the amount of macromolecular dye infiltration between IOLs and LCs was in the following order: PMMA IOLs > Silicone IOLs > Acrylic foldable IOLs. These results support a new potential mechanism that body temperature, incubation time, surface hydrophilicity and smoothness of IOLs greatly contribute to their tight binding to LCs and such tight binding may lead to reduced IOL: LC space, cell infiltration, and thus PCO formation.
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Affiliation(s)
- Arjun Jaitli
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Joyita Roy
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Amjad Chatila
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Jun Liao
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Liping Tang
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA; Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, 807, Taiwan.
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48
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Rankenberg J, Rakete S, Wagner BD, Patnaik JL, Henning C, Lynch A, Glomb MA, Nagaraj RH. Advanced glycation end products in human diabetic lens capsules. Exp Eye Res 2021; 210:108704. [PMID: 34302851 DOI: 10.1016/j.exer.2021.108704] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 07/15/2021] [Accepted: 07/16/2021] [Indexed: 10/20/2022]
Abstract
Advanced glycation end products (AGEs) accumulate with age in human lens capsules. AGEs in lens capsules potentiate the transforming growth factor beta-2-mediated mesenchymal transition of lens epithelial cells, which suggests that they play a role in posterior capsule opacification after cataract surgery. We measured AGEs by liquid chromatography-mass spectrometry in capsulorhexis specimens obtained during cataract surgery from nondiabetic and diabetic patients with and without established retinopathy. Our data showed that the levels of most AGEs (12 out of 13 measured) were unaltered in diabetic patients and diabetic patients with retinopathy compared to nondiabetic patients. There was one exception: glucosepane, which was significantly higher in diabetic patients, both with (6.85 pmol/μmol OH-proline) and without retinopathy (8.32 pmol/μmol OH-proline), than in nondiabetic patients (4.01 pmol/μmol OH-proline). Our study provides an explanation for the similar incidence of posterior capsule opacification between nondiabetic and diabetic cataract patients observed in several studies.
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Affiliation(s)
- Johanna Rankenberg
- Sue-Anschutz Eye Center, Department of Ophthalmology, School of Medicine, Aurora, CO, USA
| | - Stefan Rakete
- Sue-Anschutz Eye Center, Department of Ophthalmology, School of Medicine, Aurora, CO, USA; Present Address: Institute and Clinic for Occupational, Social and Environmental Medicine, University Hospital LMU, Munich, Germany
| | - Brandie D Wagner
- Sue-Anschutz Eye Center, Department of Ophthalmology, School of Medicine, Aurora, CO, USA; Colorado School of Public Health, Aurora, CO, USA
| | - Jennifer L Patnaik
- Sue-Anschutz Eye Center, Department of Ophthalmology, School of Medicine, Aurora, CO, USA
| | - Christian Henning
- Institute of Chemistry-Food Chemistry, Martin-Luther-University Halle-Wittenberg, 06120 Halle/ Saale, Germany
| | - Anne Lynch
- Sue-Anschutz Eye Center, Department of Ophthalmology, School of Medicine, Aurora, CO, USA
| | - Marcus A Glomb
- Institute of Chemistry-Food Chemistry, Martin-Luther-University Halle-Wittenberg, 06120 Halle/ Saale, Germany
| | - Ram H Nagaraj
- Sue-Anschutz Eye Center, Department of Ophthalmology, School of Medicine, Aurora, CO, USA; School of Pharmacy, University of Colorado, Aurora, CO, USA.
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Clinical and histopathological findings in the Dead Bag Syndrome. J Cataract Refract Surg 2021; 48:177-184. [PMID: 34261985 DOI: 10.1097/j.jcrs.0000000000000742] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 07/05/2021] [Indexed: 11/26/2022]
Abstract
PURPOSE A "dead bag syndrome" has been recently described, in which the capsular bag appears to be clear many years after surgery, becoming diaphanous and floppy, and unable to support the intraocular lens (IOL) within it. The aim of this study was to describe findings of this syndrome. SETTING John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA. DESIGN Case series with clinicopathological correlation. METHODS Out of 10 cases suspected to be from dead bag syndrome, 8 IOLs/7 capsular bags were removed due to subluxation/dislocation. The seven capsular bags available for analysis were fixed in formalin and submitted to histopathological examination (hematoxylin/eosin and Masson's trichrome stains). The associated explanted IOLs in 5 cases were also examined microscopically. RESULTS Histopathologic examination of the seven capsular bags showed capsular thinning and/or splitting. Lens epithelial cells (LECs) were completely absent on two specimens while the other five specimens had rare LECs on the inner surface of the capsule. Explanted IOLs were three-piece silicone lenses or single-piece hydrophobic acrylic lenses. One IOL optic showed a small amount of granular pigment deposition, but the optics of the other four lenses were unremarkable. CONCLUSIONS In this syndrome, there appears to be an absence of secondary proliferation of LECs, as well as fibrotic changes. The capsule shows some signs of degradation, such as thinning and/or splitting. Weakness of zonular attachments appears to be an associated finding, with subsequent in-the-bag IOL dislocation. Further studies are necessary to ascertain the etiology of this condition.
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Zhou Y, Bennett TM, Shiels A. Mutation of the TRPM3 cation channel underlies progressive cataract development and lens calcification associated with pro-fibrotic and immune cell responses. FASEB J 2021; 35:e21288. [PMID: 33484482 DOI: 10.1096/fj.202002037r] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/23/2020] [Accepted: 12/03/2020] [Indexed: 12/11/2022]
Abstract
Transient-receptor-potential cation channel, subfamily M, member 3 (TRPM3) serves as a polymodal calcium sensor in diverse mammalian cell-types. Mutation of the human TRPM3 gene (TRPM3) has been linked with inherited forms of early-onset cataract with or without other eye abnormalities. Here, we have characterized the ocular phenotypes of germline "knock-in" mice that harbor a human cataract-associated isoleucine-to-methionine mutation (p.I65M) in TRPM3 (Trpm3-mutant) compared with germline "knock-out" mice that functionally lack TRPM3 (Trpm3-null). Despite strong expression of Trpm3 in lens epithelial cells, neither heterozygous (Trpm3+/- ) nor homozygous (Trpm3-/- ) Trpm3-null mice developed cataract; however, the latter exhibited a mild impairment of lens growth. In contrast, homozygous Trpm3-M/M mutants developed severe, progressive, anterior pyramid-like cataract with microphthalmia, whereas heterozygous Trpm3-I/M and hemizygous Trpm3-M/- mutants developed anterior pyramidal cataract with delayed onset and progression-consistent with a semi-dominant lens phenotype. Histochemical staining revealed abnormal accumulation of calcium phosphate-like deposits and collagen fibrils in Trpm3-mutant lenses and immunoblotting detected increased αII-spectrin cleavage products consistent with calpain hyper-activation. Immunofluorescent confocal microscopy of Trpm3-M/M mutant lenses revealed fiber cell membrane degeneration that was accompanied by accumulation of alpha-smooth muscle actin positive (α-SMA+ve) myofibroblast-like cells and macrosialin positive (CD68+ve) macrophage-like cells. Collectively, our mouse model data support an ocular disease association for TRPM3 in humans and suggest that (1) Trpm3 deficiency impaired lens growth but not lens transparency and (2) Trpm3 dysfunction resulted in progressive lens degeneration and calcification coupled with pro-fibrotic (α-SMA+ve) and immune (CD68+ve) cell responses.
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Affiliation(s)
- Yuefang Zhou
- Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, MO, USA
| | - Thomas M Bennett
- Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, MO, USA
| | - Alan Shiels
- Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, MO, USA
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