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Peters K, McDonald T, Muhammad F, Walsh M, Drenen K, Montieth A, Stephen Foster C, Lee DJ. A2Ar-dependent PD-1+ and TIGIT+ Treg cells have distinct homing requirements to suppress autoimmune uveitis in mice. Mucosal Immunol 2023; 16:422-431. [PMID: 37164238 PMCID: PMC10512849 DOI: 10.1016/j.mucimm.2023.04.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/18/2023] [Accepted: 04/22/2023] [Indexed: 05/12/2023]
Abstract
The proper function of regulatory T cells (Tregs) to suppress inflammation requires homing to the correct tissue site. Resolution of autoimmune uveitis generates distinct programmed death receptor 1 (PD-1+) and T-cell immunoreceptor with immunoglobulin and immunoreceptor tyrosine-based inhibitory motif domains (TIGIT+) Tregs in an adenosine 2A receptor (A2Ar)-dependent manner found in the spleen. Where and how these Tregs migrate from the spleen to prevent uveitis is not known. In this work, we show that A2Ar-dependent Tregs migrated to the eye and secondary lymphoid tissue and expressed chemokine receptor (CCR)6 and CCR7. Suppression of autoimmune uveitis required CCR6 and CCR7 expression for TIGIT+ Tregs but not PD-1+ Tregs. Moreover, stimulation of A2Ar on T cells from patients showed a decreased capacity to induce TIGIT+ Tregs that expressed CCR6 or CCR7, and PD-1+ Treg that expressed CCR6. This work provides a mechanistic understanding of the homing requirements of each of these Treg populations. Importantly, this work is clinically relevant because patients with chronic autoimmune uveitis are unable to induce the Treg populations identified in mice that home to the target tissue.
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Affiliation(s)
- Kayleigh Peters
- Department of Ophthalmology/Dean McGee Eye Institute, University of Oklahoma Health Sciences Center, Oklahoma City, USA
| | - Trisha McDonald
- Department of Ophthalmology/Dean McGee Eye Institute, University of Oklahoma Health Sciences Center, Oklahoma City, USA
| | - Fauziyya Muhammad
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, USA
| | - Marisa Walsh
- Massachusetts Eye Research and Surgery Institute, Waltham, USA; Ocular Immunology and Uveitis Foundation, Waltham, USA
| | - Kayla Drenen
- Massachusetts Eye Research and Surgery Institute, Waltham, USA; Ocular Immunology and Uveitis Foundation, Waltham, USA
| | - Alyssa Montieth
- Massachusetts Eye Research and Surgery Institute, Waltham, USA; Ocular Immunology and Uveitis Foundation, Waltham, USA
| | - C Stephen Foster
- Massachusetts Eye Research and Surgery Institute, Waltham, USA; Ocular Immunology and Uveitis Foundation, Waltham, USA; Harvard Medical School, Boston, USA
| | - Darren J Lee
- Department of Ophthalmology/Dean McGee Eye Institute, University of Oklahoma Health Sciences Center, Oklahoma City, USA; Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, USA; Department of Ophthalmology and Visual Sciences, University of Massachusetts Chan Medical School, Worcester, USA.
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Rojas-Carabali W, Mejía-Salgado G, Cifuentes-González C, Villabona-Martínez V, Barraquer-López ND, Valdés-Arias D, de-la-Torre A. Clinical relationship between dry eye disease and uveitis: a scoping review. J Ophthalmic Inflamm Infect 2023; 13:2. [PMID: 36715869 PMCID: PMC9886213 DOI: 10.1186/s12348-022-00323-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 12/26/2022] [Indexed: 01/31/2023] Open
Abstract
This scoping review examined the relationship between Dry Eye Disease (DED) and Uveitis. We searched Pubmed, Embase, and LILACS databases for articles in which at least one patient had DED and uveitis concomitantly. The search produced 2381 records, and 24 studies were included in the qualitative synthesis. We concluded that DED and uveitis of any etiology could appear concomitantly in patients of any age. However, both diseases seem to coexist more frequently in middle-aged women and cases of anterior uveitis. Therefore, it is crucial that ophthalmologists actively look for the coexistence of ocular surface abnormalities, especially in patients with these characteristics. Future studies should establish and quantify the risk factors and pathophysiological mechanisms of this coexistence to achieve an early diagnosis of both etiologies and comprehensive management of these patients.
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Affiliation(s)
- William Rojas-Carabali
- grid.412191.e0000 0001 2205 5940Neuroscience Research Group (NEUROS), Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
| | - Germán Mejía-Salgado
- grid.412191.e0000 0001 2205 5940Neuroscience Research Group (NEUROS), Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia ,grid.412191.e0000 0001 2205 5940Ophthalmology Interest Group, Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
| | - Carlos Cifuentes-González
- grid.412191.e0000 0001 2205 5940Neuroscience Research Group (NEUROS), Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia ,grid.412191.e0000 0001 2205 5940Ophthalmology Interest Group, Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
| | - Valeria Villabona-Martínez
- grid.412191.e0000 0001 2205 5940Neuroscience Research Group (NEUROS), Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
| | - Nicolás Doménico Barraquer-López
- grid.412191.e0000 0001 2205 5940Neuroscience Research Group (NEUROS), Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia ,grid.412191.e0000 0001 2205 5940Ophthalmology Interest Group, Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
| | - David Valdés-Arias
- grid.412191.e0000 0001 2205 5940Neuroscience Research Group (NEUROS), Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
| | - Alejandra de-la-Torre
- grid.412191.e0000 0001 2205 5940Neuroscience Research Group (NEUROS), Neurovitae Center for Neuroscience, Institute of Translational Medicine (IMT), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
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Gao Y, Xue M, Dai B, Tang Y, Liu J, Zhao C, Meng H, Yan F, Zhu X, Lu Y, Ge Y. Identification of immune associated potential molecular targets in proliferative diabetic retinopathy. BMC Ophthalmol 2023; 23:27. [PMID: 36658547 PMCID: PMC9854219 DOI: 10.1186/s12886-023-02774-y] [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: 03/15/2022] [Accepted: 01/06/2023] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND Diabetic retinopathy (DR) is one of the most common microvascular complications of diabetes and causes of blindness in developed countries. Our study was designed to identify immune-related genes involved in the progression of proliferative diabetic retinopathy (PDR). METHODS The "GSE102485" dataset of neovascular membrane samples (NVMs) from type 1 and 2 diabetes mellitus patients was downloaded from the Gene Expression Omnibus database. Functional enrichment analyses, protein-protein interaction network (PPI) construction, and module analysis of immune pathways in NVMs and controls were conducted via Gene Set Enrichment Analysis and Metascape. RESULTS The significantly upregulated hallmark gene sets in DR2 and DR1 groups were involved in five immune pathways. Only CCR4, CXCR6, C3AR1, LPAR1, C5AR1, and P2RY14 were not previously reported in the context of PDR molecular pathophysiology. Except for P2RY14, all of the above were upregulated in retinal samples from experimental diabetes mouse models and human retina microvascular endothelial cells (HRMECs) treated with high glucose (HG) by quantitative Real Time Polymerase Chain Reaction (qRT-PCR). CONCLUSION The genes identified herein provide insight into immune-related differential gene expression during DR progression.
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Affiliation(s)
- Ying Gao
- grid.41156.370000 0001 2314 964XDepartment of Ophthalmology, Affilia Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province China
| | - Min Xue
- Department of Ophthalmology, Anhui NO.2 Provincial People’s Hospital, Hefei, Anhui China
| | - Bing Dai
- grid.417028.80000 0004 1799 2608Department of Vascular Surgery, Tianjin Hospital, Tianjin, China
| | - Yun Tang
- grid.41156.370000 0001 2314 964XDepartment of Ophthalmology, Affilia Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province China
| | - Jingyu Liu
- grid.41156.370000 0001 2314 964XDepartment of Ophthalmology, Affilia Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province China
| | - Changlin Zhao
- grid.41156.370000 0001 2314 964XDepartment of Ophthalmology, Affilia Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province China
| | - Hu Meng
- grid.41156.370000 0001 2314 964XDepartment of Ophthalmology, Affilia Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province China
| | - Feng Yan
- grid.41156.370000 0001 2314 964XDepartment of Ophthalmology, Affilia Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province China
| | - Xiaomin Zhu
- grid.41156.370000 0001 2314 964XDepartment of Ophthalmology, Affilia Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province China
| | - Yan Lu
- grid.41156.370000 0001 2314 964XDepartment of Ophthalmology, Affilia Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province China
| | - Yirui Ge
- grid.41156.370000 0001 2314 964XDepartment of Ophthalmology, Affilia Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province China
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Comparison of Two Experimental Mouse Dry Eye Models through Inflammatory Gene Set Enrichment Analysis Based on a Multiplexed Transcriptomic Approach. Int J Mol Sci 2021; 22:ijms221910770. [PMID: 34639111 PMCID: PMC8509332 DOI: 10.3390/ijms221910770] [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: 08/30/2021] [Revised: 09/26/2021] [Accepted: 09/30/2021] [Indexed: 01/31/2023] Open
Abstract
The goal of this study was to explore the specific signaling pathways related to inflammation in two experimental mouse dry eye (EDE) models. Female C57BL/6 mice housed for 10 days in a controlled desiccative environment were either treated with scopolamine (EDE-1; n = 18) or subjected to extraorbital lacrimal gland excision bilaterally (EDE-2; n = 10). Non-induced mice (n = 20) served as healthy controls. A corneal fluorescein staining (CFS) scoring was used at baseline through to day (D) 10 to evaluate epitheliopathy. At D10, corneas and conjunctivas were collected for multiplexed transcriptomic analysis with the NanoString® mouse inflammatory CodeSet. Both EDE-1 and EDE-2 mice presented a change in corneal integrity, with a significant increase in CFS scores at D10. More gene transcripts were identified in EDE-2 compared with EDE-1 (116 vs. 96, respectively), and only a few were common to both models, 13 for the cornea and 6 for the conjunctiva. The gene functional annotation analysis revealed that the same inflammatory pathways were involved in both models. Comparative profiling of gene expression in the two EDE models leads to the identification of various targets and signaling pathways, which can be extrapolated to and confirmed in human disease.
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Roy NS, Wei Y, Yu Y, Ying GS, Kuklinski E, Barry B, Maguire MG, Dana R, Brightwell-Arnold M, Asbell PA. Conjunctival HLA-DR Expression and Its Association With Symptoms and Signs in the DREAM Study. Transl Vis Sci Technol 2019; 8:31. [PMID: 31489258 PMCID: PMC6707226 DOI: 10.1167/tvst.8.4.31] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 05/20/2019] [Indexed: 12/29/2022] Open
Abstract
Purpose Evaluation of dry eye disease (DED) relies on subjective symptoms and signs. We examined HLA-DR expression (HLA-DR%) in conjunctival cells, a minimally invasive biomarker with objective metrics, as an alternative method. Methods Dry Eye Assessment and Management (DREAM) study participants completed the Ocular Surface Disease Index questionnaire. Clinicians evaluated tear volume, tear breakup time, and corneal and conjunctival staining. Conjunctival impression cytology samples (n = 1049) were assessed for HLA-DR% in total cells (TCs), epithelial cells (ECs), and white blood cells (WBCs). Associations (categorized into <5%, 5%–15%, >15%–25%, and >25%) with symptoms and signs were evaluated. Results The HLA-DR% varied markedly across samples. Over 40% had <5 HLA-DR% positive cells in TCs and ECs and under 23% in WBCs. Higher HLA-DR% was associated with higher conjunctival staining for ECs (mean score 2.77 for <5% and 3.28 for >25%, linear trend P = 0.009) and TCs (mean score 2.82 for <5% and 3.29 for >25%, linear trend P = 0.04) and in TCs was associated with higher corneal staining (mean score 3.59 for <5% and 4.46 for >25%, linear trend P = 0.03). HLA-DR% in WBCs did not correlated with signs (all P ≥ 0.58), and in TCs, ECs or WBCs were not associated with symptoms (P> 0.06). Conclusions The distribution of HLA-DR% in conjunctival cells reflects the heterogeneity of disease in DREAM participants. High percentages of samples with <5% positive cells indicate that HLA-DR% may not be a sensitive marker for DED in all patients. Translational Relevance High HLA-DR% in ECs in association with high conjunctival staining may identify a subgroup of DED patients prone to epithelial disease and possibly need a different approach from current standards of treatment.
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Affiliation(s)
- Neeta S Roy
- Department of Ophthalmology, Hamilton Eye Institute, University of Tennessee Health Science Center, 930 Madison Avenue, Memphis, TN, USA
| | - Yi Wei
- Department of Ophthalmology, Hamilton Eye Institute, University of Tennessee Health Science Center, 930 Madison Avenue, Memphis, TN, USA
| | - Yinxi Yu
- Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, 3535 Market Street, Suite 700, Philadelphia, PA, USA
| | - Gui-Shuang Ying
- Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, 3535 Market Street, Suite 700, Philadelphia, PA, USA
| | - Eric Kuklinski
- Department of Ophthalmology, Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Brendan Barry
- Department of Ophthalmology, Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Maureen G Maguire
- Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, 3535 Market Street, Suite 700, Philadelphia, PA, USA
| | - Reza Dana
- Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA
| | - Mary Brightwell-Arnold
- Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, 3535 Market Street, Suite 700, Philadelphia, PA, USA
| | - Penny A Asbell
- Department of Ophthalmology, Hamilton Eye Institute, University of Tennessee Health Science Center, 930 Madison Avenue, Memphis, TN, USA
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Roy NS, Wei Y, Kuklinski E, Asbell PA. The Growing Need for Validated Biomarkers and Endpoints for Dry Eye Clinical Research. Invest Ophthalmol Vis Sci 2017; 58:BIO1-BIO19. [PMID: 28475698 PMCID: PMC5455411 DOI: 10.1167/iovs.17-21709] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 04/04/2017] [Indexed: 11/30/2022] Open
Abstract
Purpose Biomarkers with minimally invasive and reproducible objective metrics provide the key to future paradigm shifts in understanding of the underlying causes of dry eye disease (DED) and approaches to treatment of DED. We review biomarkers and their validity in providing objective metrics for DED clinical research and patient care. Methods The English-language literature in PubMed primarily over the last decade was surveyed for studies related to identification of biomarkers of DED: (1) inflammation, (2) point-of-care, (3) ocular imaging, and (4) genetics. Relevant studies in each group were individually evaluated for (1) methodological and analytical details, (2) data and concordance with other similar studies, and (3) potential to serve as validated biomarkers with objective metrics. Results Significant work has been done to identify biomarkers for DED clinical trials and for patient care. Interstudy variation among studies dealing with the same biomarker type was high. This could be attributed to biologic variations and/or differences in processing, and data analysis. Correlation with other signs and symptoms of DED was not always clear or present. Conclusions Many of the biomarkers reviewed show the potential to serve as validated and objective metrics for clinical research and patient care in DED. Interstudy variation for a given biomarker emphasizes the need for detailed reporting of study methodology, including information on subject characteristics, quality control, processing, and analysis methods to optimize development of nonsubjective metrics. Biomarker development offers a rich opportunity to significantly move forward clinical research and patient care in DED. Overview DED is an unmet medical need - a chronic pain syndrome associated with variable vision that affects quality of life, is common with advancing age, interferes with the comfortable use of contact lenses, and can diminish results of eye surgeries, such as cataract extraction, LASIK, and glaucoma procedures. It is a worldwide medical challenge with a prevalence rate ranging from 8% to 50%. Many clinicians and researchers across the globe are searching for better answers to understand the mechanisms related to the development and chronicity of DED. Though there have been many clinical trials for DED, few new treatments have emerged over the last decade. Biomarkers may provide the needed breakthrough to propel our understanding of DED to the next level and the potential to realize our goal of truly personalized medicine based on scientific evidence. Clinical trials and research on DED have suffered from the lack of validated biomarkers and less than objective and reproducible endpoints. Current work on biomarkers has provided the groundwork to move forward. This review highlights primarily ocular biomarkers that have been investigated for use in DED, discusses the methodologic outcomes in providing objective metrics for clinical research, and suggests recommendations for further work.
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Affiliation(s)
- Neeta S. Roy
- Department of Ophthalmology, Icahn School of Medicine at Mount Sinai, New York, New York, United States
| | - Yi Wei
- Department of Ophthalmology, Icahn School of Medicine at Mount Sinai, New York, New York, United States
| | - Eric Kuklinski
- Department of Ophthalmology, Icahn School of Medicine at Mount Sinai, New York, New York, United States
| | - Penny A. Asbell
- Department of Ophthalmology, Icahn School of Medicine at Mount Sinai, New York, New York, United States
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Feng P, Wang H, Feldman RS, Pribitkin EA, Breslin PAS. The T cells in peripheral taste tissue of healthy human adults: predominant memory T cells and Th-1 cells. Chem Senses 2010; 35:501-9. [PMID: 20457570 DOI: 10.1093/chemse/bjq040] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A healthy taste system is important to the maintenance of nutrition and overall quality of life, and taste disorders are associated with many inflammatory states. We previously determined the immune cells in normal human gustatory tissue; they are predominantly dendritic cells and CD4 T cells with a few macrophages and B lymphocytes present. There are, however, few reports of the subtypes of resident lymphocytes in or near taste tissues. The present study further characterized the distribution and population of the major subtypes of T cells in situ within biopsies of healthy human fungiform papillae (FP). Immunohistochemical analyses indicated that T-helper (Th)1 cells (CCR5+) were more predominant in FP than Th2 T cells (CCR4+). CD45RO+ memory T cells were the principal T cells in gustatory tissue, whereas CD45RA+ naive T cells were uncommon. Regarding subcompartments of the tissue, most intraepithelial lymphocytes of FPs were gamma/delta T cells, whereas the major subtype of lymphocytes in the lamina propria were alpha/beta T cells. Regulatory T cells that express CTLA-4 (CD152) and interleukin-2 receptors (IL-2R, CD25) were found at low levels in FP. The T cells stand ready to respond to inflammatory and infectious insults and may play a role in the taste alterations observed during acute and chronic inflammatory states.
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Affiliation(s)
- Pu Feng
- Monell Chemical Senses Center, 3500 Market Street, Philadelphia, PA 19104, USA.
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Lyon F, Gale RP, Lightman S. Recent developments in the treatment of uveitis: an update. Expert Opin Investig Drugs 2010; 18:609-16. [PMID: 19388878 DOI: 10.1517/14728220902852570] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The management of complex uveitis is often based around the use of oral corticosteroids. To spare the side effects of corticosteroids, second-line oral immunosuppressant drugs are used. Newer systemic immunosuppressive drugs, including biologics, and locally delivered treatments are being evaluated. This article reviews current conventional treatments, discusses their limitations and evaluates newer treatment strategies. Current theories about the pathogenesis of uveitis and potential targets for treatment are discussed in this context. We are still in search of a low-risk, where possible, locally delivered and targeted treatment for uveitis.
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Affiliation(s)
- Fiona Lyon
- Academic Unit of Ophthalmology, York Hospital, Wigginton Road, York YO318HE, UK
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Abstract
Impression cytology (IC) allows cells to be harvested from the ocular surface noninvasively. Superficial layers of the epithelium are removed by application of cellulose acetate filters or Biopore membranes, and the cells can be subsequently analyzed by various methods, depending on the objective of the investigation or pathology involved. IC techniques are easily learned, can be performed in an outpatient setting, and cause virtually no discomfort to the patient. IC facilitates the diagnosis of ocular surface disorders, including, among others, keratoconjunctivitis sicca, ocular surface squamous neoplasia, and ocular surface infections. During the past decade, IC has been used increasingly to assist in diagnosis of ocular surface disease, improve our understanding of the pathophysiology of ocular surface disease, and provide biomarkers to be used as outcome measures in clinical trials. Dry eye disease is one area in which IC has contributed to significant advances.
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Bucolo C, Musumeci M, Maltese A, Drago F, Musumeci S. Effect of chitinase inhibitors on endotoxin-induced uveitis (EIU) in rabbits. Pharmacol Res 2008; 57:247-52. [PMID: 18353673 DOI: 10.1016/j.phrs.2008.02.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Revised: 02/06/2008] [Accepted: 02/06/2008] [Indexed: 01/12/2023]
Abstract
The acidic mammalian chitinase (AMCase) is significantly increased in tears of human allergic conjunctivitis. The aim of the study was to investigate the effects of chitinase inhibitors, allosamidin and caffeine versus dexamethasone, in rabbit endotoxin-induced uveitis (EIU). EIU was induced in rabbits by a single intravitreal injection of 100ng/10microl lipopolysaccharide (LPS). Drugs at four different concentrations (0.1, 0.01, 0.001 and 0.0001mM) were topically applied to the rabbit eye five times in 24h. Tears were collected at 0, 6 and 24h after LPS to measure the AMCase activity. The effect of treatment was also evaluated at the same time by slit lamp examination. Tear AMCase activity increased 6 and 24h after LPS injection. The AMCase activity was significantly inhibited in all treated groups with all doses of allosamidin and caffeine except with the lowest concentration. A higher AMCase inhibition at 24h was found with allosamidin and caffeine compared to dexamethasone. Moreover, topical administration of allosamidin, caffeine and dexamethasone produced a remarkable reduction of inflammatory signs, in the order: dexamethasone>caffeine>allosamidin. AMCase inhibitors showed in this rabbit model of uveitis a notable control of inflammatory response with a significant reduction of AMCase activity in tears with caffeine and allosamidin. These results support the key role of AMCase in the pathogenesis of human ocular inflammatory diseases and the therapeutic effect of AMCase inhibitors on experimental uveitis.
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Affiliation(s)
- Claudio Bucolo
- Department of Experimental and Clinical Pharmacology, School of Medicine, University of Catania, Catania, Italy
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Ahn JK. Th1 and Th2 responses on the ocular surface in uveitis identified by CCR4 and CCR5 conjunctival expression. Am J Ophthalmol 2008; 145:387; author reply 387-8. [PMID: 18222196 DOI: 10.1016/j.ajo.2007.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2007] [Accepted: 10/15/2007] [Indexed: 11/17/2022]
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