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Chen HA, Tai YN, Hsieh EH, Thacker M, Lin IC, Tseng CL, Lin FH. Injectable cross-linked hyaluronic acid hydrogels with epigallocatechin gallate loading as vitreous substitutes. Int J Biol Macromol 2024; 275:133467. [PMID: 38945319 DOI: 10.1016/j.ijbiomac.2024.133467] [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: 02/02/2024] [Revised: 06/15/2024] [Accepted: 06/25/2024] [Indexed: 07/02/2024]
Abstract
Hyaluronic acid (HA) serves as a vitreous substitute owing to its ability to mimic the physical functions of native vitreous humor. However, pure HA hydrogels alone do not provide sufficient protection against potential inflammatory risks following vitrectomy. In this study, HA was crosslinked with 1,4-butanediol diglycidyl ether (BDDE) to form HA hydrogels (HB). Subsequently, the anti-inflammatory agent epigallocatechin gallate (EGCG) was added to the hydrogel (HBE) for ophthalmic applications as a vitreous substitute. The characterization results indicated the successful preparation of HB with transparency, refractive index, and osmolality similar to those of native vitreous humor, and with good injectability. The anti-inflammatory ability of HBE was also confirmed by the reduced expression of inflammatory genes in retinal pigment epithelial cells treated with HBE compared with those treated with HB. In a New Zealand white rabbit model undergoing vitreous substitution treatment, HBE 50 (EGCG 50 μM addition) exhibited positive results at 28 days post-surgery. These outcomes included restored intraocular pressure, improved electroretinogram responses, minimal increase in corneal thickness, and no inflammation during histological examination. This study demonstrated the potential of an injectable HA-BDDE cross-linked hydrogel containing EGCG as a vitreous substitute for vitrectomy applications, offering prolonged degradation time and anti-inflammatory effects postoperatively.
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Affiliation(s)
- Huai-An Chen
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Shuang-Ho Campus, New Taipei City, Taiwan
| | - Yi-Ning Tai
- Institute of Biomedical Engineering, College of Medicine & College of Engineering, National Taiwan University, Taipei City, Taiwan
| | - Erh-Hsuan Hsieh
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Shuang-Ho Campus, New Taipei City, Taiwan
| | - Minal Thacker
- Institute of Biomedical Engineering, College of Medicine & College of Engineering, National Taiwan University, Taipei City, Taiwan; Centre for Eye and Vision Research (CEVR), 17W Hong Kong Science Park, Hong Kong
| | - I-Chan Lin
- Department of Ophthalmology, Wan Fang Hospital, Taipei Medical University, Taipei City, Taiwan; Department of Ophthalmology, School of Medicine, College of Medicine, Taipei Medical University, Taipei City, Taiwan
| | - Ching-Li Tseng
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Shuang-Ho Campus, New Taipei City, Taiwan; International Ph. D. Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Shuang-Ho Campus, New Taipei City, Taiwan; Research Center of Biomedical Device, College of Biomedical Engineering, Taipei Medical University, Taipei City, Taiwan; International Ph. D. Program in Cell Therapy and Regenerative Medicine, College of Medicine, Taipei Medical University, Taipei City, Taiwan..
| | - Feng-Huei Lin
- Institute of Biomedical Engineering, College of Medicine & College of Engineering, National Taiwan University, Taipei City, Taiwan; Institute of Biomedical Engineering & Nanomedicine (IBEN), National Health Research Institutes, Miaoli County, Taiwan.
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Lage NA, de Paiva MRB, Vasconcelos-Santos DV, Machado RR, Fialho SL, Silva-Cunha A. Efficacy and Safety Evaluation of Mometasone Furoate in Treating Ocular Inflammation. Pharmaceutics 2023; 15:pharmaceutics15010193. [PMID: 36678822 PMCID: PMC9863942 DOI: 10.3390/pharmaceutics15010193] [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: 11/30/2022] [Revised: 12/24/2022] [Accepted: 12/30/2022] [Indexed: 01/06/2023] Open
Abstract
Mometasone furoate (MF) is a medium-potency synthetic glucocorticosteroid with anti-inflammatory, antipruritic, and vasoconstrictive properties. However, its role in the treatment of ocular inflammation has not yet been explored. This work investigated the anti-inflammatory activity of MF in ocular tissues. First, the in vivo safety of the intravitreal (IVT) injection of MF (80, 160, and 240 µg) was evaluated via clinical examination (including the assessment of intraocular pressure), electroretinography (ERG), and histopathology. Second, MF was tested in an experimental model of bacillus Calmette-Guérin (BCG)-induced uveitis in Wistar rats. Intraocular inflammation was then evaluated via a slit-lamp and fundus examination, ERG, histopathology, and the quantification of pro-inflammatory markers. Intravitreal MF showed no toxicity in all the investigated doses, with 160 µg leading to attenuated disease progression and improvement in clinical, morphological, and functional parameters. There was a significant reduction in the levels of inflammatory markers (myeloperoxidase, interleukins 6 and 1β, CXCL-1, and tumor necrosis factor-alpha) when compared to the levels in untreated animals. Therefore, MF should be further investigated as a promising drug for the treatment of ocular inflammation.
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Affiliation(s)
- Nayara Almeida Lage
- Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Mayara Rodrigues Brandão de Paiva
- Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil
- Research and Development, Ezequiel Dias Foundation, Belo Horizonte 30510-010, Brazil
| | | | - Renes Resende Machado
- Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Sílvia Ligório Fialho
- Research and Development, Ezequiel Dias Foundation, Belo Horizonte 30510-010, Brazil
| | - Armando Silva-Cunha
- Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil
- Correspondence: ; Tel.: +55-31-34096949
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Kato K, Sugawara A, Nagashima R, Sugimoto M, Ikesugi K, Matsubara H, Takeuchi M, Kondo M. Case of lens-induced uveitis associated with supernormal flicker ERG amplitudes after cataract surgery. Doc Ophthalmol 2020; 142:233-238. [PMID: 32808145 DOI: 10.1007/s10633-020-09786-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Accepted: 08/05/2020] [Indexed: 11/26/2022]
Abstract
PURPOSE To report our findings in a case of lens fragment-induced uveitis associated with supernormal flicker electroretinograms (ERGs) twenty months after the cataract surgery. METHODS This is an observational case report. Full-field flicker ERGs were recorded with the RETeval system. Optical coherence tomography (OCT) and slit-lamp biomicroscopy were used to assess the uveitis during the follow-up period. RESULTS A 70-year-old man, who had undergone cataract surgery 20 months earlier, visited our hospital with a complaint of decreased vision in his right eye. Slit-lamp biomicroscopy revealed corneal edema and a lens fragment was detected in the inferior part of the anterior chamber. OCT showed cystoid macular edema, and flicker ERGs showed a marked increase in the amplitude and a delay in the implicit time in the right eye. These abnormalities of the flicker ERGs improved gradually after the removal of lens fragment and application of topical anti-inflammatory medications. CONCLUSION Our case of lens-induced uveitis had supernormal flicker ERG amplitudes. Clinicians should be aware that eyes with uveitis can have larger-than-normal ERG amplitudes.
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Affiliation(s)
- Kumiko Kato
- Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie, 514-8507, Japan.
| | - Asako Sugawara
- Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie, 514-8507, Japan
| | - Ryunosuke Nagashima
- Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie, 514-8507, Japan
| | - Masahiko Sugimoto
- Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie, 514-8507, Japan
| | - Kengo Ikesugi
- Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie, 514-8507, Japan
| | - Hisashi Matsubara
- Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie, 514-8507, Japan
| | - Maki Takeuchi
- Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie, 514-8507, Japan
| | - Mineo Kondo
- Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie, 514-8507, Japan
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Brouwer AH, de Wit GC, ten Dam NH, Wijnhoven R, van Genderen MM, de Boer JH. Prolonged Cone b-Wave on Electroretinography Is Associated with Severity of Inflammation in Noninfectious Uveitis. Am J Ophthalmol 2019; 207:121-129. [PMID: 31173740 DOI: 10.1016/j.ajo.2019.05.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 05/13/2019] [Accepted: 05/14/2019] [Indexed: 12/19/2022]
Abstract
PURPOSE This study sought to investigate retinal function in patients with noninfectious uveitis by using full-field electroretinography (ERG) and correlate the ERG to disease duration and severity of inflammation. DESIGN Prospective cohort study. METHODS Patients (n = 200) with noninfectious uveitis and a disease duration of <1 year (group A [n = 80]) and those with a disease duration of >5 years (group B [n = 120]) were included. ERGs of the total 355 uveitis eyes were measured according to an extended International Society for Clinical Electrophysiology of Vision protocol. ERG abnormalities were related to demographics and uveitis characteristics, including anatomical classification, duration of uveitis, severity of inflammation, best corrected visual acuity (BCVA), cystoid macular edema (CME), and the highest fluorescein angiography (FA) score during the course of the disease. RESULTS ERGs showed abnormalities in 235 eyes (66.2%). The most frequent and pronounced ERG abnormality was a prolonged implicit time of the cone b-wave (151 eyes [42.5%]), which was associated with vitritis (P = .005); cells in the anterior chamber (P = .007); the highest fluorescein angiography score (P = .011); age (P < 0.001); and pupil diameter (P < 0.001). BCVA was relatively good (0.05 logMAR [interquartile range {IQR}, 0.011, 0.22]) and not associated with this ERG abnormality. There were no differences between the ERG abnormalities in group A and those in group B and no significant associations between ERG abnormalities and anatomical classification or specific diagnoses. CONCLUSIONS ERG results are frequently affected in cases of noninfectious uveitis of all anatomic subtypes, including anterior uveitis without apparent inflammation of the posterior segment. ERG abnormalities appear to be associated with the severity of inflammation from both the present and the past and therefore may be seen even when signs of retinal inflammation have disappeared.
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