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Luib E, Demleitner AF, Cordts I, Westenberg E, Rau P, Pürner D, Haller B, Lingor P. Reduced tear fluid production in neurological diseases: a cohort study in 708 patients. J Neurol 2024; 271:1824-1836. [PMID: 38063868 DOI: 10.1007/s00415-023-12104-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 10/27/2023] [Accepted: 10/28/2023] [Indexed: 03/28/2024]
Abstract
BACKGROUND Tear fluid (TF) production is an important component of normal ocular function. It is regulated by parasympathetic and sympathetic innervation. Because parasympathetic nerve fibers originate in the brainstem, pathology in this brain region may affect TF production. For example, a reduction in TF production has been described in patients with Parkinson's disease (PD). METHODS TF was collected at one center from 772 individuals, 708 of which were patients with different neurological diseases, and 64 healthy controls. Wetting lengths (WL) were recorded using Schirmer test strips with a collection time of 10 min. RESULTS WL correlated negatively with age and was significantly reduced in subgroups of patients with neurodegenerative diseases (NDDs) (PD, Amyotrophic lateral sclerosis (ALS), other motor neuron diseases (MNDs)), as well as inflammatory/autoimmune/infectious central nervous system (CNS) diseases and vascular CNS diseases (VCDs), even if corrected for age or sex. While temperature had a significant negative effect on TF production, other environmental factors, such as hours of sunlight and humidity, did not. CONCLUSION WL was altered in many neurological diseases compared to healthy controls. Most importantly, we observed a reduction of WL in NDDs, independent of age or sex. This study highlights the potential of WL as an easily obtainable parameter and suggests functional alterations in the autonomic innervation in various neurological disorders.
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Affiliation(s)
- Elena Luib
- Department of Neurology, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Antonia F Demleitner
- Department of Neurology, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Isabell Cordts
- Department of Neurology, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Erica Westenberg
- Department of Neurology, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Petra Rau
- Department of Neurology, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Dominik Pürner
- Department of Neurology, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Bernhard Haller
- Institute of AI and Informatics in Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - Paul Lingor
- Department of Neurology, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany.
- DZNE, German Center for Neurodegenerative Diseases, Munich, Germany.
- Munich Cluster for Systems Neurology (SyNergy), Munich, Germany.
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Beisel A, Jones G, Glass J, Lee TJ, Töteberg-Harms M, Estes A, Ulrich L, Bollinger K, Sharma S, Sharma A. Comparative analysis of human tear fluid and aqueous humor proteomes. Ocul Surf 2024; 33:16-22. [PMID: 38561100 DOI: 10.1016/j.jtos.2024.03.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 03/15/2024] [Accepted: 03/29/2024] [Indexed: 04/04/2024]
Abstract
PURPOSE Technological advancements allowing for the analysis of low-volume samples have led to the investigation of human tear fluid and aqueous humor (AH) as potential biomarker sources. However, acquiring AH samples poses significant challenges, making human tear fluid a more accessible alternative. This study aims to compare the protein compositions of these two biofluids to evaluate their suitability for biomarker discovery. METHODS Paired tear and AH samples were collected from 20 patients undergoing cataract surgery. Tear samples were collected using Schirmer strips prior to surgery, and AH samples were collected from the anterior chamber immediately after corneal incision. Proteins were extracted and analyzed using liquid chromatography-tandem mass spectrometry (LC-MS/MS). RESULTS A total of 481 proteins were identified in greater than 50% of the tear samples, and 191 proteins were detected in greater than 50% of the AH samples. Of these proteins, 82 were found to be common between the two biofluids, with ALB, LTF, TF, LCN1, and IGKC being the most abundant. CONCLUSION Although tear fluid and the AH are functionally independent and physically separated, many of the proteins detected in AH were also detected in tears. This direct comparison of the proteomic content of tear fluid and AH may aid in further investigation of tear fluid as a source of readily accessible biomarkers for various human diseases.
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Affiliation(s)
- August Beisel
- Department of Ophthalmology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Garrett Jones
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Joshua Glass
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Tae Jin Lee
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Marc Töteberg-Harms
- Department of Ophthalmology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Amy Estes
- Department of Ophthalmology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Lane Ulrich
- Department of Ophthalmology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Kathryn Bollinger
- Department of Ophthalmology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Shruti Sharma
- Department of Ophthalmology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA; Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Ashok Sharma
- Department of Ophthalmology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA; Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA; Department of Population Health Sciences, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
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Gijs M, Jorna N, Datson N, Beekman C, Dansokho C, Weiss A, Linden DEJ, Oosterloo M. High levels of mutant huntingtin protein in tear fluid from Huntington's Disease Gene Expansion Carriers. J Mov Disord 2024:jmd.24014. [PMID: 38379425 DOI: 10.14802/jmd.24014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 02/21/2024] [Indexed: 02/22/2024] Open
Abstract
Objective Huntington's disease (HD) is an autosomal dominant, fully penetrant, neurodegenerative disease that most commonly affects adults in mid-life. HD is caused by a CAG repeat expansion in the HTT gene, resulting in the expression of mutant huntingtin (mHTT). Our aim was to detect and quantify mHTT in tear fluid, which to our knowledge has never been measured before. Methods We recruited 20 manifest, 13 premanifest HD gene expansion carriers (HDGECs) and 20 age-matched controls. All patients underwent detailed assessments, including Unified Huntington's Disease Rating Scale (UHDRS) total motor score (TMS) and total function capacity score. Tear fluid was collected using paper Schirmer's strips. The level of tear mHTT was determined using the Single Molecule Counting SMCxPRO technology. Results Average tear mHTT levels in manifest (67,223 ± 80,360 fM) and premanifest patients (55,561 ± 45,931 fM) were significantly higher than in controls (1622 ± 2179 fM). We noted significant correlations between tear mHTT levels and CAG repeat length, 'estimated years to diagnosis', disease burden score and UHDRS TMS and TFC. The ROC curve demonstrated an almost perfect score (AUC = 0.9975) when comparing controls to manifest patients. Similarly, the AUC between controls and premanifest patients was 0.9846. The optimal cut-off value to distinguish between controls and manifest patients was 4544 fM, whereas it was 6596 fM for the distinction between controls and premanifest patients. Conclusions Tear mHTT levels have the potential for early and non-invasive detection of alterations in HD and could be integrated into both clinical trials and clinical diagnostics.
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Affiliation(s)
- Marlies Gijs
- University Eye Clinic Maastricht, School for Mental Health and Neuroscience (MHeNs), Maastricht University Medical Center (MUMC+), Maastricht, The Netherlands
| | - Nynke Jorna
- Department of Neurology, School for Mental Health and Neuroscience (MHeNs), Maastricht University Medical Center (MUMC+), Maastricht, The Netherlands
| | | | | | | | | | - David E J Linden
- Department of Neurology, School for Mental Health and Neuroscience (MHeNs), Maastricht University Medical Center (MUMC+), Maastricht, The Netherlands
| | - Mayke Oosterloo
- Department of Neurology, School for Mental Health and Neuroscience (MHeNs), Maastricht University Medical Center (MUMC+), Maastricht, The Netherlands
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Vergouwen DP, Kolijn PM, de Hoog J, de Boer JH, Los LI, Gijs M, Erckens RJ, de Jong PH, Rothova A, Ten Berge JC, Schreurs MW. Potential Biomarkers for Noninfectious Scleritis Identified by Serum and Tear Fluid Proteomics. Ophthalmol Sci 2024; 4:100407. [PMID: 38054106 PMCID: PMC10694766 DOI: 10.1016/j.xops.2023.100407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 09/20/2023] [Accepted: 09/28/2023] [Indexed: 12/07/2023]
Abstract
Purpose Scleritis is an extremely painful and potentially blinding inflammation of the sclera with unknown pathogenesis and unpredictable course. To gain insight in its disease process and identify biomarker candidates, we performed extensive proteomics in serum and tear fluid. Design Prospective multicenter cohort study. Participants A total of 121 patients with noninfectious scleritis (of which 39 active cases), 30 healthy controls, and 23 disease controls (uveitis and rheumatoid arthritis) were enrolled in the Netherlands from 2020 to 2022. Methods Serum, tear fluid of both eyes, and clinical data were gathered. The level of 368 inflammatory proteins was measured using proximity extension assays. Results were validated in an independent cohort of 15 patients with scleritis, and using addressable laser bead immunoassay, or enzyme-linked immunoassays. In addition, we studied an extended panel of matrix metalloproteinases in tear fluid of necrotizing scleritis with addressable laser bead immunoassay. Main Outcome Measures Statistically significant differences in the level of inflammatory proteins between patients with scleritis and control groups. Results Proteomics revealed 18 significantly upregulated or downregulated serum proteins in active scleritis cases compared with all control groups in both the discovery cohort and the validation cohort. The most upregulated protein was nuclear migration protein nudC (NudC; P = 0.0032), a protein involved in neurogenesis. The other significant hits included proteins involved in T-cell activation, apoptosis, epithelial barrier maintenance, and angiogenesis. Our tear fluid analysis showed matrix metalloproteinase 9 (MMP9) to be upregulated in the tear fluid of patients with scleral necrosis. Conclusions The results of our proteomics analysis suggest a role for neurogenesis, T-cell activation, disruption of epithelial barrier, and angiogenesis in the pathogenesis of scleritis, and highlight MMP9 and NudC as biomarkers with potential clinical relevance. Funding Disclosures The authors have no proprietary or commercial interest in any materials discussed in this article.
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Affiliation(s)
- Daphne P.C. Vergouwen
- Department of Ophthalmology, Erasmus University Medical Center, Rotterdam, The Netherlands
- Laboratory Medical Immunology, Department of Immunology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - P. Martijn Kolijn
- Laboratory Medical Immunology, Department of Immunology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Joeri de Hoog
- Department of Ophthalmology, Amsterdam University Medical Center, Amsterdam, The Netherlands
| | - Joke H. de Boer
- Department of Ophthalmology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Leonoor I. Los
- Department of Ophthalmology, University Medical Center Groningen, Groningen, The Netherlands
| | - Marlies Gijs
- University Eye Clinic, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Roel J. Erckens
- University Eye Clinic, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Pascal H.P. de Jong
- Department of Rheumatology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Aniki Rothova
- Department of Ophthalmology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Josianne C. Ten Berge
- Department of Ophthalmology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Marco W.J. Schreurs
- Laboratory Medical Immunology, Department of Immunology, Erasmus University Medical Center, Rotterdam, The Netherlands
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Wang H, Jiang X, Zhang P, Li Y, Wang Y, Li X. Allergen-specific IgE in the tear fluid of Chinese patients with common allergic conjunctivitis in autumn and winter. Int Ophthalmol 2023; 43:4541-4549. [PMID: 37668849 DOI: 10.1007/s10792-023-02854-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 08/05/2023] [Indexed: 09/06/2023]
Abstract
PURPOSE In this study, we determined the positive rates of allergen-specific immunoglobulin E (IgE) in the tear fluid of Chinese patients with common allergic conjunctivitis (AC) in autumn and winter, compared systemic and ocular allergen tests, and explored the correlation between the numbers and categories of allergens and clinical AC features. METHODS This cross-sectional study recruited 44 patients with AC (86 eyes). Specific IgEs for allergens common in China (house dust mite, cat/dog dander, mugwort/ragweed pollen, cottonwood/willow/elm pollen, milk, egg whites, soybeans) were measured in collected tears using kits for allergen-specific IgE antibodies. AC signs and symptoms were graded according to severity. RESULTS Specific IgE in tears was positive in 87.2% of eyes. House dust mite was the most common allergen (86.0%), followed by cat (24.4%) and dog (7.0%) dander; tree and grass pollen accounted for only 4.7% and 2.3%, respectively. Food allergens were not detected. The positive rates of the systemic allergen tests were lower than in tear fluid tests in both eyes, especially for house dust mites (P = 0.000). In patients with more allergens, itching was more severe (P = 0.035), while conjunctival hyperemia was milder (P = 0.002). CONCLUSION In autumn and winter, the most common AC allergen in Chinese patients was house dust mites. Compared with systemic allergen tests, measuring specific IgE in tears may be a non-invasive method to diagnose and evaluate AC severity, which may be more suitable to reflect the local conditions of ocular surface inflammation due to its high positive rate and convenience.
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Affiliation(s)
- Hongmei Wang
- Department of Ophthalmology, Peking University Third Hospital Eye Center, 49 North Garden Rd, Haidian District, Beijing, 100191, People's Republic of China
| | - Xiaodan Jiang
- Department of Ophthalmology, Peking University Third Hospital Eye Center, 49 North Garden Rd, Haidian District, Beijing, 100191, People's Republic of China
| | - Pei Zhang
- Department of Ophthalmology, Peking University Third Hospital Eye Center, 49 North Garden Rd, Haidian District, Beijing, 100191, People's Republic of China
| | - Yingyu Li
- Department of Ophthalmology, Peking University Third Hospital Eye Center, 49 North Garden Rd, Haidian District, Beijing, 100191, People's Republic of China
| | - Yiren Wang
- Department of Ophthalmology, Peking University Third Hospital Eye Center, 49 North Garden Rd, Haidian District, Beijing, 100191, People's Republic of China
| | - Xuemin Li
- Department of Ophthalmology, Peking University Third Hospital Eye Center, 49 North Garden Rd, Haidian District, Beijing, 100191, People's Republic of China.
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van de Sande N, Ramakers IHGB, Visser PJ, Verhey FRJ, Verbraak FD, Bouwman FH, Berendschot TTJM, Nuijts RMMA, Webers CAB, Gijs M. Tear biomarkers for Alzheimer's disease screening and diagnosis (the TearAD study): design and rationale of an observational longitudinal multicenter study. BMC Neurol 2023; 23:293. [PMID: 37543602 PMCID: PMC10403876 DOI: 10.1186/s12883-023-03335-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 07/17/2023] [Indexed: 08/07/2023] Open
Abstract
BACKGROUND Alzheimer's disease (AD) is the most common cause of dementia, and due to increasing life expectancy the number of patients is expected to grow. The diagnosis of AD involves the use of biomarkers determined by an amyloid PET scan or cerebrospinal fluid analyses that are either invasive or expensive, and not available in each hospital, thus limiting their usage as a front-line screener. The TearAD study aims to use tear fluid as a potential source for AD biomarkers. In previous reports, we demonstrated that AD biomarkers amyloid-beta and tau, are measurable in tear fluid and are associated with disease severity and neurodegeration. This study aims to validate previous results in a larger cohort and evaluate the diagnostic accuracy of tear biomarkers to discriminate between individuals with and without neurodegeneration as determined by hippocampal atrophy. METHODS The TearAD study is an observational longitudinal multi-center study that will enroll 50 cognitively healthy controls, 50 patients with subjective cognitive decline, 50 patients with mild cognitive impairment and 50 patients with AD dementia from the memory clinic. Participants will be examined at baseline, after one year, and after two years follow-up. Study assessments include neuropsychological tests and ophthalmic examination. All participants will receive a MRI scan, and a subset of the study population will undergo cerebral spinal fluid collection and an amyloid PET scan. Tear fluid will be collected with Schirmer strips and levels of Aβ38, Aβ40, Aβ42, t-tau and p-tau in tear fluid will be determined using multiplex immunoassays. Blood samples will be collected from all participants. Images of the retina will be obtained with a standard, hyperspectral and ultra-wide field fundus camera. Additionally, macular pigment optical density will be measured with the macular pigment reflectometer, and cross-sectional images of the retina will be obtained through optical coherence tomography imaging. DISCUSSION The TearAD study will provide insight into the potential diagnostic use of tear biomarkers as a minimally invasive and low cost tool for the screening and diagnosis of AD. TRIAL REGISTRATION Retrospectively registered at clinicaltrials.gov (NCT05655793).
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Affiliation(s)
- Nienke van de Sande
- School of Mental Health and Neuroscience (MHeNs), University Eye Clinic Maastricht, Maastricht University, Maastricht, The Netherlands.
| | - Inez H G B Ramakers
- Department of Psychiatry and Neuropsychology, Alzheimer Center Limburg, School of Mental Health and Neuroscience (MHeNs), Maastricht University, Maastricht, The Netherlands
| | - Pieter Jelle Visser
- Department of Psychiatry and Neuropsychology, Alzheimer Center Limburg, School of Mental Health and Neuroscience (MHeNs), Maastricht University, Maastricht, The Netherlands
- Alzheimer Center Amsterdam, Department of Neurology, Amsterdam University Medical Center, Amsterdam, Netherlands
| | - Frans R J Verhey
- Department of Psychiatry and Neuropsychology, Alzheimer Center Limburg, School of Mental Health and Neuroscience (MHeNs), Maastricht University, Maastricht, The Netherlands
| | - Frank D Verbraak
- Ophthalmology Department, Amsterdam UMC, location VUmc, Amsterdam, The Netherlands
| | - Femke H Bouwman
- Alzheimer Center Amsterdam, Department of Neurology, Amsterdam University Medical Center, Amsterdam, Netherlands
| | - Tos T J M Berendschot
- School of Mental Health and Neuroscience (MHeNs), University Eye Clinic Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Rudy M M A Nuijts
- School of Mental Health and Neuroscience (MHeNs), University Eye Clinic Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Carroll A B Webers
- School of Mental Health and Neuroscience (MHeNs), University Eye Clinic Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Marlies Gijs
- School of Mental Health and Neuroscience (MHeNs), University Eye Clinic Maastricht, Maastricht University, Maastricht, The Netherlands
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Kropp M, De Clerck E, Vo TTKS, Thumann G, Costigliola V, Golubnitschaja O. Short communication: unique metabolic signature of proliferative retinopathy in the tear fluid of diabetic patients with comorbidities - preliminary data for PPPM validation. EPMA J 2023; 14:43-51. [PMID: 36845280 PMCID: PMC9944425 DOI: 10.1007/s13167-023-00318-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Accepted: 02/08/2023] [Indexed: 02/24/2023]
Abstract
Type 2 diabetes (T2DM) defined as the adult-onset type that is primarily not insulin-dependent, comprises over 95% of all diabetes mellitus (DM) cases. According to global records, 537 million adults aged 20-79 years are affected by DM that means at least 1 out of 15 persons. This number is projected to grow by 51% by the year 2045. One of the most common complications of T2DM is diabetic retinopathy (DR) with an overall prevalence over 30%. The total number of the DR-related visual impairments is on the rise, due to the growing T2DM population. Proliferative diabetic retinopathy (PDR) is the progressing DR and leading cause of preventable blindness in working-age adults. Moreover, PDR with characteristic systemic attributes including mitochondrial impairment, increased cell death and chronic inflammation, is an independent predictor of the cascading DM-complications such as ischemic stroke. Therefore, early DR is a reliable predictor appearing upstream of this "domino effect". Global screening, leading to timely identification of DM-related complications, is insufficiently implemented by currently applied reactive medicine. A personalised predictive approach and cost-effective targeted prevention shortly - predictive, preventive and personalised medicine (PPPM / 3PM) could make a good use of the accumulated knowledge, preventing blindness and other severe DM complications. In order to reach this goal, reliable stage- and disease-specific biomarker panels are needed characterised by an easy way of the sample collection, high sensitivity and specificity of analyses. In the current study, we tested the hypothesis that non-invasively collected tear fluid is a robust source for the analysis of ocular and systemic (DM-related complications) biomarker patterns suitable for differential diagnosis of stable DR versus PDR. Here, we report the first results of the comprehensive ongoing study, in which we correlate individualised patient profiles (healthy controls versus patients with stable D as well as patients with PDR with and without co-morbidities) with their metabolic profiles in the tear fluid. Comparative mass spectrometric analysis performed has identified following metabolic clusters which are differentially expressed in the groups of comparison: acylcarnitines, amino acid & related compounds, bile acids, ceramides, lysophosphatidyl-choline, nucleobases & related compounds, phosphatidyl-cholines, triglycerides, cholesterol esters, and fatty acids. Our preliminary data strongly support potential clinical utility of metabolic patterns in the tear fluid indicating a unique metabolic signature characteristic for the DR stages and PDR progression. This pilot study creates a platform for validating the tear fluid biomarker patterns to stratify T2DM-patients predisposed to the PDR. Moreover, since PDR is an independent predictor of severe T2DM-related complications such as ischemic stroke, our international project aims to create an analytical prototype for the "diagnostic tree" (yes/no) applicable to healthrisk assessment in diabetes care.
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Affiliation(s)
- Martina Kropp
- Experimental Ophthalmology, University of Geneva, 1205 Geneva, Switzerland
- Ophthalmology Department, University Hospitals of Geneva, 1205 Geneva, Switzerland
| | - Eline De Clerck
- Experimental Ophthalmology, University of Geneva, 1205 Geneva, Switzerland
- Ophthalmology Department, University Hospitals of Geneva, 1205 Geneva, Switzerland
| | - Trong-Tin Kevin Steve Vo
- Experimental Ophthalmology, University of Geneva, 1205 Geneva, Switzerland
- Ophthalmology Department, University Hospitals of Geneva, 1205 Geneva, Switzerland
| | - Gabriele Thumann
- Experimental Ophthalmology, University of Geneva, 1205 Geneva, Switzerland
- Ophthalmology Department, University Hospitals of Geneva, 1205 Geneva, Switzerland
| | | | - Olga Golubnitschaja
- Predictive, Preventive and Personalised (3P) Medicine, Department of Radiation Oncology, University Hospital Bonn, Rheinische Friedrich-Wilhelms-Universität Bonn, 53127 Bonn, Germany
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Kropp M, Golubnitschaja O, Mazurakova A, Koklesova L, Sargheini N, Vo TTKS, de Clerck E, Polivka J, Potuznik P, Polivka J, Stetkarova I, Kubatka P, Thumann G. Diabetic retinopathy as the leading cause of blindness and early predictor of cascading complications-risks and mitigation. EPMA J 2023; 14:21-42. [PMID: 36866156 PMCID: PMC9971534 DOI: 10.1007/s13167-023-00314-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 01/15/2023] [Indexed: 02/17/2023]
Abstract
Proliferative diabetic retinopathy (PDR) the sequel of diabetic retinopathy (DR), a frequent complication of diabetes mellitus (DM), is the leading cause of blindness in the working-age population. The current screening process for the DR risk is not sufficiently effective such that often the disease is undetected until irreversible damage occurs. Diabetes-associated small vessel disease and neuroretinal changes create a vicious cycle resulting in the conversion of DR into PDR with characteristic ocular attributes including excessive mitochondrial and retinal cell damage, chronic inflammation, neovascularisation, and reduced visual field. PDR is considered an independent predictor of other severe diabetic complications such as ischemic stroke. A "domino effect" is highly characteristic for the cascading DM complications in which DR is an early indicator of impaired molecular and visual signaling. Mitochondrial health control is clinically relevant in DR management, and multi-omic tear fluid analysis can be instrumental for DR prognosis and PDR prediction. Altered metabolic pathways and bioenergetics, microvascular deficits and small vessel disease, chronic inflammation, and excessive tissue remodelling are in focus of this article as evidence-based targets for a predictive approach to develop diagnosis and treatment algorithms tailored to the individual for a cost-effective early prevention by implementing the paradigm shift from reactive medicine to predictive, preventive, and personalized medicine (PPPM) in primary and secondary DR care management.
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Affiliation(s)
- Martina Kropp
- Division of Experimental Ophthalmology, Department of Clinical Neurosciences, University of Geneva University Hospitals, 1205 Geneva, Switzerland ,Ophthalmology Department, University Hospitals of Geneva, 1205 Geneva, Switzerland
| | - Olga Golubnitschaja
- Predictive, Preventive and Personalised (3P) Medicine, Department of Radiation Oncology, University Hospital Bonn, Rheinische Friedrich-Wilhelms-Universität Bonn, 53127 Bonn, Germany
| | - Alena Mazurakova
- Clinic of Obstetrics and Gynecology, Jessenius Faculty of Medicine, Comenius University in Bratislava, 036 01 Martin, Slovakia
| | - Lenka Koklesova
- Clinic of Obstetrics and Gynecology, Jessenius Faculty of Medicine, Comenius University in Bratislava, 036 01 Martin, Slovakia
| | - Nafiseh Sargheini
- Max Planck Institute for Plant Breeding Research, Carl-Von-Linne-Weg 10, 50829 Cologne, Germany
| | - Trong-Tin Kevin Steve Vo
- Division of Experimental Ophthalmology, Department of Clinical Neurosciences, University of Geneva University Hospitals, 1205 Geneva, Switzerland ,Ophthalmology Department, University Hospitals of Geneva, 1205 Geneva, Switzerland
| | - Eline de Clerck
- Division of Experimental Ophthalmology, Department of Clinical Neurosciences, University of Geneva University Hospitals, 1205 Geneva, Switzerland ,Ophthalmology Department, University Hospitals of Geneva, 1205 Geneva, Switzerland
| | - Jiri Polivka
- Department of Histology and Embryology, and Biomedical Centre, Faculty of Medicine in Plzen, Charles University, Prague, Czech Republic
| | - Pavel Potuznik
- Department of Neurology, University Hospital Plzen, and Faculty of Medicine in Plzen, Charles University, 100 34 Prague, Czech Republic
| | - Jiri Polivka
- Department of Neurology, University Hospital Plzen, and Faculty of Medicine in Plzen, Charles University, 100 34 Prague, Czech Republic
| | - Ivana Stetkarova
- Department of Neurology, University Hospital Kralovske Vinohrady, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Peter Kubatka
- Department of Medical Biology, Jessenius Faculty of Medicine, Comenius University in Bratislava, 036 01 Martin, Slovakia
| | - Gabriele Thumann
- Division of Experimental Ophthalmology, Department of Clinical Neurosciences, University of Geneva University Hospitals, 1205 Geneva, Switzerland ,Ophthalmology Department, University Hospitals of Geneva, 1205 Geneva, Switzerland
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de Barros MRM, Chakravarti S. Pathogenesis of keratoconus: NRF2-antioxidant, extracellular matrix and cellular dysfunctions. Exp Eye Res 2022; 219:109062. [PMID: 35385756 DOI: 10.1016/j.exer.2022.109062] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 03/19/2022] [Accepted: 03/30/2022] [Indexed: 11/04/2022]
Abstract
Keratoconus (KC) is a degenerative disease associated with cell and extracellular matrix (ECM) loss that causes gradual thinning and steepening of the cornea and loss of vision. Collagen cross linking with ultraviolet light treatment can strengthen the ECM and delay weakening of the cornea, but severe cases require corneal transplantation. KC is multifactorial and multigenic, but its pathophysiology is still an enigma. Multiple approaches are being pursued to elucidate the molecular changes that underlie the corneal phenotype to identify relevant genes for tailored candidate searches and to develop potential biomarkers and targets for therapeutic interventions. Recent proteomic and transcriptomic studies suggest dysregulations in oxidative stress, NRF2-regulated antioxidant programs, WNT-signaling, TGF-β, ECM and matrix metalloproteinases. This review aims to provide a broad update on the transcriptomic and proteomic studies of KC with a focus on findings that relate to oxidative stress, and dysregulations in cellular and extracellular matrix functions.
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Affiliation(s)
| | - Shukti Chakravarti
- Department of Ophthalmology, NYU Grossman School of Medicine, NY, 10016, USA; Department of Pathology, NYU Grossman School of Medicine, NY, 10016, USA.
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10
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Sanap SN, Mishra A, Bisen AC, Agrawal S, Biswas A, Verma SK, Kumar M, Bhatta RS. Simultaneous determination of fluconazole and ofloxacin in rabbit tear fluid by LC-MS/MS: Application to ocular pharmacokinetic studies. J Pharm Biomed Anal 2022; 208:114463. [PMID: 34798393 DOI: 10.1016/j.jpba.2021.114463] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/14/2021] [Accepted: 11/02/2021] [Indexed: 12/20/2022]
Abstract
The expansion of polymicrobial keratomycosis (PMK) requires dynamic pharmacotherapy of antimycotics along with antibacterial agents such as fluconazole (FCZ) and ofloxacin (OFX). To effective clinical cure, different microbes require different dosage regimens. A responsive, selective, and fast method for estimation of FCZ and OFX in rabbit tears using high-performance liquid chromatography together with tandem mass spectrometry (LC-MS/MS) was established and validated using ketoconazole as an internal standard (IS). An isocratic separation was achieved using a C18 column with methanol and aqueous 0.2% formic acid (80:20, v/v) as a mobile phase with a total run time and flow rate of 4 min and 400 µL/ min, respectively. The FCZ and OFX were detected utilizing positive ion electrospray ionization (ESI) in multiple reactions monitoring mode. The tear sample extraction was carried out using simple deproteination using methanol. The systematic method validation was carried out according to USFDA regulatory guidelines for selectivity, linearity (r2>0.99), intra-day and inter-day precision and accuracy, matrix effect, dilution integrity, and stability. The validated bioanalytical method was successfully pertained to determine the pharmacokinetics profile of FCZ and OFX marketed formulation in preclinical rabbit tears.
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Affiliation(s)
- Sachin Nashik Sanap
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Anjali Mishra
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Amol Chhatrapati Bisen
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sristi Agrawal
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Arpon Biswas
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Jawaharlal Nehru University, New Delhi 110067, India
| | - Sarvesh Kumar Verma
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Jawaharlal Nehru University, New Delhi 110067, India
| | - Mukesh Kumar
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute, Lucknow 226031, India; Jawaharlal Nehru University, New Delhi 110067, India
| | - Rabi Sankar Bhatta
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute, Lucknow 226031, India.
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11
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Nandi SK, Singh D, Upadhay J, Gupta N, Dhiman N, Mittal SK, Mahindroo N. Identification of tear-based protein and non-protein biomarkers: Its application in diagnosis of human diseases using biosensors. Int J Biol Macromol 2021; 193:838-846. [PMID: 34728300 DOI: 10.1016/j.ijbiomac.2021.10.198] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 09/30/2021] [Accepted: 10/26/2021] [Indexed: 12/27/2022]
Abstract
Discovery of robust, selective and specific biomarkers are important for early diagnosis and monitor progression of human diseases. Eye being a common target for several human diseases, vision impediment and complications are often associated with systemic and ocular diseases. Tears are bodily fluids that are closest to eye and are rich in protein content and other metabolites. As a biomarker repository, it advantages over other bodily fluids due to the ability to collect it non-invasively. In this review, we highlight some recent advancements in identification of tear-based protein biomarkers like lacryglobin and cystatin SA for cancer; interleukin-6 and immunoglobulin-A antibody for COVID-19; tau, amyloid-β-42 and lysozyme-C for Alzheimer's disease; peroxiredoxin-6 and α-synuclein for Parkinson's disease; kallikrein, angiotensin converting enzyme and lipocalin-1 for glaucoma; lactotransferrin and lipophilin-A for diabetic retinopathy and zinc-alpha-2 glycoprotein-1, prolactin and calcium binding protein-A4 for eye thyroid disease. We also discussed identification of tear based non-protein biomarkers like lysophospholipids and acetylcarnitine for glaucoma, 8-hydroxy-2'-deoxyquanosine and malondialdehyde for thyroid eye disease. We elucidate technological advancement in developing tear-based biosensors for diagnosis and monitoring diseases such as diabetes, diabetic retinopathy and Alzheimer's disease. Altogether, the study of tears as potential biomarkers for early diagnosis of human diseases is promising.
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Affiliation(s)
- Sandip K Nandi
- School of Health Sciences, University of Petroleum and Energy Studies, Dehradun, Uttarakhand 248007, India.
| | - Deepanmol Singh
- School of Health Sciences, University of Petroleum and Energy Studies, Dehradun, Uttarakhand 248007, India
| | - Jyoti Upadhay
- School of Health Sciences, University of Petroleum and Energy Studies, Dehradun, Uttarakhand 248007, India
| | - Neeti Gupta
- Department of Ophthalmology, All India Institute of Medical Sciences, Rishikesh 249203, India
| | - Nayan Dhiman
- School of Health Sciences, University of Petroleum and Energy Studies, Dehradun, Uttarakhand 248007, India
| | - Sanjeev Kumar Mittal
- Department of Ophthalmology, All India Institute of Medical Sciences, Rishikesh 249203, India
| | - Neeraj Mahindroo
- School of Health Sciences, University of Petroleum and Energy Studies, Dehradun, Uttarakhand 248007, India.
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12
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Zhan X, Li J, Guo Y, Golubnitschaja O. Mass spectrometry analysis of human tear fluid biomarkers specific for ocular and systemic diseases in the context of 3P medicine. EPMA J 2021; 12:449-475. [PMID: 34876936 PMCID: PMC8639411 DOI: 10.1007/s13167-021-00265-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 11/03/2021] [Indexed: 12/23/2022]
Abstract
Over the last two decades, a large number of non-communicable/chronic disorders reached an epidemic level on a global scale such as diabetes mellitus type 2, cardio-vascular disease, several types of malignancies, neurological and eye pathologies-all exerted system's enormous socio-economic burden to primary, secondary, and tertiary healthcare. The paradigm change from reactive to predictive, preventive, and personalized medicine (3PM/PPPM) has been declared as an essential transformation of the overall healthcare approach to benefit the patient and society at large. To this end, specific biomarker panels are instrumental for a cost-effective predictive approach of individualized prevention and treatments tailored to the person. The source of biomarkers is crucial for specificity and reliability of diagnostic tests and treatment targets. Furthermore, any diagnostic approach preferentially should be noninvasive to increase availability of the biomaterial, and to decrease risks of potential complications as well as concomitant costs. These requirements are clearly fulfilled by tear fluid, which represents a precious source of biomarker panels. The well-justified principle of a "sick eye in a sick body" makes comprehensive tear fluid biomarker profiling highly relevant not only for diagnostics of eye pathologies but also for prediction, prognosis, and treatment monitoring of systemic diseases. One prominent example is the Sicca syndrome linked to a cascade of severe complications that include dry eye, neurologic, and oncologic diseases. In this review, protein profiles in tear fluid are highlighted and corresponding biomarkers are exemplified for several relevant pathologies, including dry eye disease, diabetic retinopathy, cancers, and neurological disorders. Corresponding analytical approaches such as sample pre-processing, differential proteomics, electrophoretic techniques, high-performance liquid chromatography (HPLC), enzyme-linked immuno-sorbent assay (ELISA), microarrays, and mass spectrometry (MS) methodology are detailed. Consequently, we proposed the overall strategies based on the tear fluid biomarkers application for 3P medicine practice. In the context of 3P medicine, tear fluid analytical pathways are considered to predict disease development, to target preventive measures, and to create treatment algorithms tailored to individual patient profiles.
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Affiliation(s)
- Xianquan Zhan
- Shandong Key Laboratory of Radiation Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University, 440 Jiyan Road, Jinan, 250117 Shandong China
- Medical Science and Technology Innovation Center, Shandong First Medical University, 6699 Qingdao Road, Jinan, 250117 Shandong China
- Gastroenterology Research Institute and Clinical Center, Shandong First Medical University, 38 Wuying Shan Road, Jinan, Shandong 250031 People’s Republic of China
| | - Jiajia Li
- Medical Science and Technology Innovation Center, Shandong First Medical University, 6699 Qingdao Road, Jinan, 250117 Shandong China
- Key Laboratory of Cancer Proteomics of Chinese Ministry of Health, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, 410008 Hunan China
| | - Yuna Guo
- Medical Science and Technology Innovation Center, Shandong First Medical University, 6699 Qingdao Road, Jinan, 250117 Shandong China
| | - Olga Golubnitschaja
- Predictive, Preventive and Personalised (3P) Medicine, Department of Radiation Oncology, University Hospital Bonn, Rheinische Friedrich-Wilhelms-University of Bonn, Sigmund-Freud-Str 25, 53105 Bonn, Germany
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13
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Tabor LM, Grosser MR, Metruccio MMME, Kumar NG, Wu YT, Nieto V, Evans DJ, Fleiszig SMJ. Human tear fluid modulates the Pseudomonas aeruginosa transcriptome to alter antibiotic susceptibility. Ocul Surf 2021; 22:94-102. [PMID: 34332149 PMCID: PMC10139757 DOI: 10.1016/j.jtos.2021.07.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 06/08/2021] [Accepted: 07/26/2021] [Indexed: 11/24/2022]
Abstract
PURPOSE Previously, we showed that tear fluid protects corneal epithelial cells against Pseudomonas aeruginosa without suppressing bacterial viability. Here, we studied how tear fluid affects bacterial gene expression. METHODS RNA-sequencing was used to study the P. aeruginosa transcriptome after tear fluid exposure (5 h, 37 oC). Outcomes were further investigated by biochemical and physiological perturbations to tear fluid and tear-like fluid (TLF) and assessment of bacterial viability following tear/TLF pretreatment and antibiotic exposure. RESULTS Tear fluid deregulated ~180 P. aeruginosa genes ≥8 fold versus PBS including downregulating lasI, rhlI, qscR (quorum sensing/virulence), oprH, phoP, phoQ (antimicrobial resistance) and arnBCADTEF (polymyxin B resistance). Upregulated genes included algF (biofilm formation) and hemO (iron acquisition). qPCR confirmed tear down-regulation of oprH, phoP and phoQ. Tear fluid pre-treatment increased P. aeruginosa resistance to meropenem ~5-fold (4 μg/ml), but enhanced polymyxin B susceptibility ~180-fold (1 μg/ml), the latter activity reduced by dilution in PBS. Media containing a subset of tear components (TLF) also sensitized bacteria to polymyxin B, but only ~22.5-fold, correlating with TLF/tear fluid Ca2+ and Mg2+ concentrations. Accordingly, phoQ mutants were not sensitized by TLF or tear fluid. Superior activity of tear fluid versus TLF against wild-type P. aeruginosa was heat resistant but proteinase K sensitive. CONCLUSION P. aeruginosa responds to human tear fluid by upregulating genes associated with bacterial survival and adaptation. Meanwhile, tear fluid down-regulates multiple virulence-associated genes. Tears also utilize divalent cations and heat resistant/proteinase K sensitive component(s) to enhance P. aeruginosa sensitivity to polymyxin B.
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Affiliation(s)
- Lauren M Tabor
- School of Optometry, University of California, Berkeley, CA, USA
| | | | | | - Naren G Kumar
- School of Optometry, University of California, Berkeley, CA, USA
| | - Yvonne T Wu
- School of Optometry, University of California, Berkeley, CA, USA
| | - Vincent Nieto
- School of Optometry, University of California, Berkeley, CA, USA
| | - David J Evans
- School of Optometry, University of California, Berkeley, CA, USA; College of Pharmacy, Touro University California, Vallejo, CA, USA
| | - Suzanne M J Fleiszig
- School of Optometry, University of California, Berkeley, CA, USA; Graduate Groups in Vision Science, Microbiology, and Infectious Diseases & Immunity, University of California, Berkeley, CA, USA.
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14
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Eidet JR, Akopian M, Olstad OK, Jørstad ØK, Moe MC, Petrovski G, Pepaj M. The acute phase response protein SERPINA3 is increased in tear fluid from the unaffected eyes of patients with unilateral acute anterior uveitis. J Ophthalmic Inflamm Infect 2021; 11:19. [PMID: 34212267 PMCID: PMC8249488 DOI: 10.1186/s12348-021-00249-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 05/28/2021] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND To identify candidate tear fluid biomarkers in patients with unilateral acute anterior uveitis (AAU) that can aid in the differentiation between these patients and patients with bacterial keratitis or healthy controls. METHODS Thirteen patients (40.1 ± 16.2 years of age) with unilateral AAU, seven patients with unilateral bacterial keratitis (40.2 ± 15.3 years of age), and 14 healthy subjects (41.1 ± 11.6 years of age) were included. The tear proteome of affected eyes was compared with that of the unaffected eye or healthy controls. Proteins were identified by liquid chromatography tandem mass spectrometry and enzyme-linked immunosorbent assay. RESULTS Relative protein ratios were detected and calculated for 272 unique proteins. Compared with healthy controls and the unaffected eye, the top upregulated proteins in AAU eyes were submaxillary gland androgen regulated protein 3B (SMR3B) and SMR3A. Similarly, the top upregulated proteins in bacterial keratitis were S100 calcium-binding protein A9 and orosomucoid 2. The acute phase response protein Serpin Family A Member 3 (SERPINA3) was increased in the healthy eye of AAU patients (P = 0.019) compared with healthy controls. Laser flare measurements in affected eyes of AAU patients showed positive logarithmic correlation with SERPINA3 in tear samples of the unaffected eye (P = 0.022). The use of SERPINA3 as a tear biomarker yielded a sensitivity of 85% and a specificity of 71% in detecting patients with AAU in the study population. CONCLUSIONS The acute phase response protein SERPINA3 was increased in tear samples of unaffected eyes of patients with unilateral AAU compared with healthy controls. This study highlights SERPINA3 as a potential biomarker for AAU. Future research should explore the dynamic properties of SERPINA3 in the tear fluid of active and quiescent uveitis eyes.
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Affiliation(s)
- Jon Roger Eidet
- Department of Ophthalmology, Center for Eye Research, Oslo University Hospital and University of Oslo, Oslo, Norway.
| | - Maja Akopian
- Department of Ophthalmology, Center for Eye Research, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Ole K Olstad
- Department of Medical Biochemistry, Blood Cell Research Group, Section for Research, Oslo University Hospital, Oslo, Norway
| | - Øystein Kalsnes Jørstad
- Department of Ophthalmology, Center for Eye Research, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Morten C Moe
- Department of Ophthalmology, Center for Eye Research, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Goran Petrovski
- Department of Ophthalmology, Center for Eye Research, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Milaim Pepaj
- Department of Medical Biochemistry, Hormone Laboratory, Oslo University Hospital, Oslo, Norway
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15
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Wu J, Sigler A, Pfaff A, Cen N, Ercal N, Shi H. Development of a HPLC-MS/MS method for assessment of thiol redox status in human tear fluids. Anal Biochem 2021; 629:114295. [PMID: 34186074 DOI: 10.1016/j.ab.2021.114295] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 06/02/2021] [Accepted: 06/23/2021] [Indexed: 01/17/2023]
Abstract
Oxidative stress is reported to be part of the pathology of many ocular diseases. For the diagnosis of ocular diseases, tear fluid has unique advantages. Although numerous analytical methods exist for the measurement of different types of biomolecules in tear fluid, few have been reported for comprehensive understanding of oxidative stress-related thiol redox signaling. In this study, a high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was developed to determine a panel of twelve metabolites that systematically covered several thiol metabolic pathways. With optimization of MS/MS parameters and HPLC mobile phases, this method was sensitive (LOQ as low as 0.01 ng/ml), accurate (80-125% spike recovery) and precise (<10% RSD). This LC-MS/MS method combined with a simple tear fluid collection with Schirmer test strip followed by ultrafiltration allowed the high-throughput analysis for efficient determination of metabolites associated with thiol redox signaling in human tear fluids. The method was then applied to a small cohort of tear fluids obtained from healthy individuals. The method presented here provides a new technique to facilitate future work aiming to determine the complex thiol redox signaling in tear fluids for accurate assessment and diagnosis of ocular diseases.
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Affiliation(s)
- Jiandong Wu
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO, 65409, United States
| | - Austin Sigler
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO, 65409, United States
| | - Annalise Pfaff
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO, 65409, United States
| | - Nan Cen
- Department of Computer Science, Missouri University of Science and Technology, Rolla, MO, 65409, United States
| | - Nuran Ercal
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO, 65409, United States.
| | - Honglan Shi
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO, 65409, United States.
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16
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Krajčíková K, Semančíková E, Zakutanská K, Kondrakhova D, Mašlanková J, Stupák M, Talian I, Tomašovičová N, Kimáková T, Komanický V, Dubayová K, Breznoščáková D, Pálová E, Semančík J, Tomečková V. Tear fluid biomarkers in major depressive disorder: Potential of spectral methods in biomarker discovery. J Psychiatr Res 2021; 138:75-82. [PMID: 33836432 DOI: 10.1016/j.jpsychires.2021.03.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 03/09/2021] [Accepted: 03/19/2021] [Indexed: 12/22/2022]
Abstract
Spectroscopic methods represent a group of analytical methods that demonstrate high potential in providing clinically relevant diagnostic information, such as biochemical, functional or structural changes of macromolecular complexes that might occur due to pathological processes or therapeutic intervention. Although application of these methods in the field of psychiatric research is still relatively recent, the preliminary results show that they have the capacity to detect subtle neurobiological abnormalities in major depressive disorder (MDD). Methods of mass spectrometry (MALDI-TOF MS), zymography, synchronous fluorescence spectroscopy (SFS), circular dichroism (CD) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM) were used to analyze the human tear fluid of subjects with MDD. Using MALDI-TOF MS, two diagnostically significant peaks (3747 and 16 411 m/z) were identified with an AUC value of 0.89 and 0.92 in tear fluid of subjects with MDD vs controls, respectively. We also identified various forms of matrix metalloproteinase 9 in subjects with MDD using zymography and synchronous fluorescence spectra (SFS) showed a significant increase in fluorescence intensity at 280 nm. CD spectra were redshifted in tear fluid of subjects with MDD vs healthy controls. FTIR spectroscopy showed changes in the positions of peaks for amide A, I, II in tear fluid of subjects with MDD vs controls. Moreover, atomic force microscopy (AFM) showed different pattern in the crystal structures of tear fluid components in subjects with MDD. SFS, CD, FTIR spectroscopy, AFM and MALDI-TOF MS confirmed, that the human tear fluid proteome could be helpful in discriminating between the group of subjects with MDD and healthy controls. These preliminary findings suggest that spectral methods could represent a useful tool in clinical psychiatry, especially in establishing differential diagnosis, monitoring illness progression and the effect of psychiatric treatment.
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Affiliation(s)
- Kristína Krajčíková
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Erika Semančíková
- 2(nd) Department of Psychiatry, L. Pasteur University Hospital, Rastislavova 43, Košice, 040 11, Slovakia; EPAMED s.r.o., Private Psychiatric Practice, Hlavná 68, Košice, 040 01, Slovakia.
| | - Katarína Zakutanská
- Institute of Experimental Physics, Department of Magnetism, Slovak Academy of Sciences, Watsonova 47, Košice, 040 01, Slovakia
| | - Daria Kondrakhova
- Institute of Physics, Department of Condensed Matter Physics, Faculty of Science, Pavol Jozef Šafárik University in Košice, Park Angelinum 9, Košice, 041 54, Slovakia
| | - Jana Mašlanková
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Marek Stupák
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Ivan Talian
- Department of Medical and Clinical Biophysics, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Natália Tomašovičová
- Institute of Experimental Physics, Department of Magnetism, Slovak Academy of Sciences, Watsonova 47, Košice, 040 01, Slovakia
| | - Tatiana Kimáková
- Department of Public Health and Hygiene, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Šrobárová 2, 041 80, Košice, Slovakia
| | - Vladimír Komanický
- Institute of Physics, Department of Condensed Matter Physics, Faculty of Science, Pavol Jozef Šafárik University in Košice, Park Angelinum 9, Košice, 041 54, Slovakia
| | - Katarína Dubayová
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Dagmar Breznoščáková
- 1(st) Department of Psychiatry, L. Pasteur University Hospital, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Eva Pálová
- EPAMED s.r.o., Private Psychiatric Practice, Hlavná 68, Košice, 040 01, Slovakia; 1(st) Department of Psychiatry, L. Pasteur University Hospital, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Juraj Semančík
- 4(th) Clinic of Internal Medicine, L. Pasteur University Hospital, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Vladimíra Tomečková
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
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17
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Corbini G, Dreassi E, Chiasserini L, Girolamo MM, Mellace P. Determination of copper by AAS in tear fluid of patients with keratoconus. Anal Biochem 2021; 623:114174. [PMID: 33766579 DOI: 10.1016/j.ab.2021.114174] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 03/16/2021] [Accepted: 03/18/2021] [Indexed: 11/23/2022]
Abstract
Keratoconus (KC) is the most common degenerative corneal disease and no single biomarker for KC has been discovered. Its causes have not yet been clarified and this work aims to be a contribution to the deepening of the knowledge of this disease and a preliminary data to the evaluation of the possibility of the use of copper (Cu) concentration in the tear fluid as a specific marker. A tear fluid sampling and Cu determination by spectrometric atomic absorption method was optimized to determine Cu levels in the tear fluid of patients with KC compared to that of healthy patients. Results demonstrate that in the KC subjects (n = 6) the concentration of Cu ions was 325.5 ± 110.7 ng/ml, while in the control group was 141.3 ± 71.1 ng/ml. A significant increase in Cu ion levels in the tear fluid was observed in the KC group compared to the control group (p value < 0.001).
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18
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Eidet JR, Jørstad ØK, Fostad IG, Olstad OK, Sørland RØ, Moe MC, Petrovski G, Pepaj M. Unilateral acute anterior uveitis is associated with ipsilateral changes in the tear fluid proteome that involves the LXR/RXR pathway. J Ophthalmic Inflamm Infect 2020; 10:13. [PMID: 32458144 PMCID: PMC7250997 DOI: 10.1186/s12348-020-00204-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 05/03/2020] [Indexed: 12/27/2022] Open
Abstract
PURPOSE To determine whether unilateral acute anterior uveitis (AAU) induces ipsilateral changes in the tear fluid proteome. METHODS Five patients (25-77 years old) with unilateral AAU were included. Tear fluid samples were obtained using Schirmer's test strips. The healthy eye served as control. Proteins were identified by liquid chromatography tandem mass spectrometry. RESULTS Two hundred forty-two tear fluid sample proteins were identified, of which 75 were present in at least three patients. Nine proteins were at least 1.5-fold increased, whereas eight were at least 1.5-fold decreased in tears from the diseased eye compared with the healthy eye. APOBEC3A was significantly increased (1.43-fold; P = 0.04), whereas TGM2 was significantly decreased (- 1.21-fold; P = 0.03) in tears from the diseased eye relative to the healthy eye. Ingenuity Pathway Analysis identified LXR/RXR (P < 1.02E-4) as a top canonical pathway. CONCLUSION Unilateral AAU induced detectable changes in the ipsilateral tear fluid proteome and involvement of the inflammation-associated LXR/RXR pathway.
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Affiliation(s)
- Jon Roger Eidet
- Center for Eye Research, Department of Ophthalmology, Oslo University Hospital, University of Oslo, Oslo, Norway.
| | - Øystein Kalsnes Jørstad
- Center for Eye Research, Department of Ophthalmology, Oslo University Hospital, University of Oslo, Oslo, Norway
| | - Ida G Fostad
- Faculty of Dentistry, Department of Oral Biology, University of Oslo, Oslo, Norway
| | - Ole K Olstad
- Blood Cell Research Group, Section for Research, Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Ragnhild Ø Sørland
- Center for Eye Research, Department of Ophthalmology, Oslo University Hospital, University of Oslo, Oslo, Norway
| | - Morten C Moe
- Center for Eye Research, Department of Ophthalmology, Oslo University Hospital, University of Oslo, Oslo, Norway
| | - Goran Petrovski
- Center for Eye Research, Department of Ophthalmology, Oslo University Hospital, University of Oslo, Oslo, Norway
| | - Milaim Pepaj
- Hormone Laboratory, Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
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Chistyakov DV, Azbukina NV, Astakhova AA, Goriainov SV, Chistyakov VV, Tiulina VV, Baksheeva VE, Kotelin VI, Fedoseeva EV, Zamyatnin AA, Philippov PP, Kiseleva OA, Bessmertny AM, Senin II, Iomdina EN, Sergeeva MG, Zernii EY. Comparative lipidomic analysis of inflammatory mediators in the aqueous humor and tear fluid of humans and rabbits. Metabolomics 2020; 16:27. [PMID: 32052201 DOI: 10.1007/s11306-020-1650-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 02/04/2020] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Ocular inflammation is a key pathogenic factor in most blindness-causing visual disorders. It can manifest in the aqueous humor (AH) and tear fluid (TF) as alterations in polyunsaturated fatty acids (PUFAs) and their metabolites, oxylipins, lipid mediators, which are biosynthesized via enzymatic pathways involving lipoxygenase, cyclooxygenase or cytochrome P450 monooxygenase and specifically regulate inflammation and resolution pathways. OBJECTIVES This study aimed to establish the baseline patterns of PUFAs and oxylipins in AH and TF by their comprehensive lipidomic identification and profiling in humans in the absence of ocular inflammation and comparatively analyze these compounds in the eye liquids of rabbits, the species often employed in investigative ophthalmology. METHODS Ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was used for qualitative and quantitative characterization of lipid compounds in the analyzed samples. RESULTS A total of 28 lipid compounds were identified, including phospholipid derivatives and PUFAs, as well as 22 oxylipins. Whereas the PUFAs included arachidonic, docosahexaenoic and eicosapentaenoic acids, the oxylipins were derived mainly from arachidonic, linoleic and α-linolenic acids. Remarkably, although the concentration of oxylipins in AH was lower compared to TF, these liquids showed pronounced similarity in their lipid profiles, which additionally exhibited noticeable interspecies concordance. CONCLUSION The revealed correlations confirm the feasibility of rabbit models for investigating pathogenesis and trialing therapies of human eye disorders. The identified metabolite patterns suggest enzymatic mechanisms of oxylipin generation in AH and TF and might be used as a reference in ocular inflammation studies.
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Affiliation(s)
- Dmitry V Chistyakov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992.
| | - Nadezhda V Azbukina
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, Russia, 119234
| | - Alina A Astakhova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992
| | | | | | - Veronika V Tiulina
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992
| | - Viktoriia E Baksheeva
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992
| | - Vladislav I Kotelin
- Helmholtz National Medical Research Center of Eye Diseases, Moscow, Russia, 105062
| | - Elena V Fedoseeva
- Helmholtz National Medical Research Center of Eye Diseases, Moscow, Russia, 105062
| | - Andrey A Zamyatnin
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992
- Institute of Molecular Medicine, Sechenov First Moscow State Medical University, Moscow, Russia, 119991
| | - Pavel P Philippov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992
| | - Olga A Kiseleva
- Helmholtz National Medical Research Center of Eye Diseases, Moscow, Russia, 105062
| | | | - Ivan I Senin
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992
| | - Elena N Iomdina
- Helmholtz National Medical Research Center of Eye Diseases, Moscow, Russia, 105062
| | - Marina G Sergeeva
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992
| | - Evgeni Yu Zernii
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1-40 Leninskye Gory, Moscow, Russia, 119992.
- Institute of Molecular Medicine, Sechenov First Moscow State Medical University, Moscow, Russia, 119991.
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Shetty R, Naidu JR, Nair AP, Vaidya TA, D'Souza S, Matalia H, Deshpande V, Sethu S, Ghosh A, Chakrabarty K. Distinct ocular surface soluble factor profile in human corneal dystrophies. Ocul Surf 2019; 18:237-248. [PMID: 31756391 DOI: 10.1016/j.jtos.2019.11.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Revised: 09/30/2019] [Accepted: 11/18/2019] [Indexed: 10/25/2022]
Abstract
PURPOSE Corneal dystrophies (CD) are classified as rare eye diseases that results in visual impairment and requires corneal transplant in advanced stages. Ocular surface inflammatory status in different types of CD remains underexplored. Hence, we studied the levels of tear soluble factors in the tears of patients with various types of corneal dystrophies. METHODS 17 healthy subjects and 30 CD subjects (including epithelial, stromal and endothelial CD) were included in the study. Schirmer's strips were used to collect the tear fluid in all subjects. 27 soluble factors including cytokines, chemokines, soluble cell adhesion molecules and growth factors were measured in the eluted tears by multiplex ELISA or single analyte sandwich ELISA. RESULTS Percentages of subjects with detectable levels of tear soluble factors were significantly higher in CD compared to controls. Significant higher level of IL-2 was observed in both epithelial and stromal CD. IL-4, TGFβ1 and IgE were significantly higher in stromal CD. VCAM, IL-13 and Fractalkine were significantly elevated in epithelial and macular CD. IL-1α, IL-8, IL-12, ANG, Eotaxin, MCP1, RANTES, ICAM1, L-selectin and P-selectin were significantly higher in epithelial CD. TGFBIp was significantly elevated in lattice CD and endothelial CD. CONCLUSION Distinct set of the tear soluble factors were dysregulated in various types of CD. Increase in tear inflammatory factors was observed in majority of the CD subjects depending on their sub-types. This suggests a plausible role of aberrant inflammation in CD pathobiology. Hence, modulating inflammation could be a potential strategy in improving the prognosis of CD.
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Affiliation(s)
- Rohit Shetty
- Department of Cornea and Refractive Surgery, Narayana Nethralaya, Bengaluru, India
| | - Jagadeesh R Naidu
- GROW Research Laboratory, Narayana Nethralaya Foundation, Bengaluru, India
| | | | - Tanuja Arun Vaidya
- GROW Research Laboratory, Narayana Nethralaya Foundation, Bengaluru, India
| | - Sharon D'Souza
- Department of Cornea and Refractive Surgery, Narayana Nethralaya, Bengaluru, India
| | - Himanshu Matalia
- Department of Cornea and Refractive Surgery, Narayana Nethralaya, Bengaluru, India
| | - Vrushali Deshpande
- GROW Research Laboratory, Narayana Nethralaya Foundation, Bengaluru, India
| | - Swaminathan Sethu
- GROW Research Laboratory, Narayana Nethralaya Foundation, Bengaluru, India
| | - Arkasubhra Ghosh
- GROW Research Laboratory, Narayana Nethralaya Foundation, Bengaluru, India; Singapore Eye Research Institute, Singapore.
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Hargreaves P, Daoudlarian D, Theron M, Kolb FA, Manchester Young M, Reis B, Tiaden A, Bannert B, Kyburz D, Manigold T. Differential effects of specific cathepsin S inhibition in biocompartments from patients with primary Sjögren syndrome. Arthritis Res Ther 2019; 21:175. [PMID: 31319889 PMCID: PMC6637481 DOI: 10.1186/s13075-019-1955-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 06/28/2019] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVE Primary Sjögren syndrome (pSS) is characterized by T and B cell infiltration of exocrine glands. The cysteine protease cathepsin S (CatS) is crucially involved in MHCII processing and T cell stimulation, and elevated levels have been found in patients with RA, psoriasis and pSS. However, little is known about the functional characteristics and mechanisms of SS-A- and SS-B-specific T cells in pSS patients. We herein investigated the inhibition of CatS activity in different biocompartments of pSS patients including antigen-specific T cell responses. METHODS Ex vivo CatS activity was assessed in tears, plasma and saliva of 15 pSS patients and 13 healthy controls (HC) and in the presence or absence of the specific CatS inhibitor RO5459072. In addition, antigen (SS-A (60kD), SS-B, influenza H3N2, tetanus toxoid and SEB)-specific T cell responses were examined using ex vivo IFN-γ/IL-17 Dual ELISPOT and Bromdesoxyuridin (BrdU) proliferation assays in the presence or absence of RO5459072. Supernatants were analysed for IL-1β, IL-6, IL-10, TNF-α, IL-21, IL-22 and IL-23, using conventional ELISA. RESULTS CatS activity was significantly elevated in tear fluid, but not other biocompartments, was inversely associated with exocrinic function in pSS patients and could significantly be suppressed by RO5459072. Moreover, CatS inhibition by RO5459072 led to strong and dose-dependent suppression of SS-A/SS-B-specific T cell effector functions and cytokine secretion by CD14+ monocytes. However, RO5459072 was incapable of suppressing SS-A/SS-B-induced secretion of cytokines in CD14+ monocytes when T cells were absent, confirming a CatS/MHCII-mediated mechanism of suppression. CONCLUSION CatS activity in tear fluid seems to be a relevant biomarker for pSS disease activity. Conversely, CatS inhibition diminishes T cell and associated monokine responses towards relevant autoantigens in pSS. Thus, CatS inhibition may represent a promising novel treatment strategy in pSS.
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Affiliation(s)
- Patrick Hargreaves
- Department of Rheumatology, University Hospital Basel, Basel, Switzerland
| | | | - Michel Theron
- Roche Pharma Research and Early Development, Roche Innovation Center Basel, F. Hoffmann-La Roche, Basel, Switzerland
| | - Fabrice A. Kolb
- Roche Pharma Research and Early Development, Roche Innovation Center Basel, F. Hoffmann-La Roche, Basel, Switzerland
| | - Marianne Manchester Young
- Roche Pharma Research and Early Development, Roche Innovation Center Basel, F. Hoffmann-La Roche, Basel, Switzerland
| | - Bernhard Reis
- Roche Pharma Research and Early Development, Roche Innovation Center Basel, F. Hoffmann-La Roche, Basel, Switzerland
| | - Andre Tiaden
- Department of Rheumatology, University Hospital Basel, Basel, Switzerland
| | - Bettina Bannert
- Department of Rheumatology, University Hospital Basel, Basel, Switzerland
| | - Diego Kyburz
- Department of Rheumatology, University Hospital Basel, Basel, Switzerland
| | - Tobias Manigold
- Department of Rheumatology, University Hospital Basel, Basel, Switzerland
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Calvo R, López-Malo D, Penadés M, Romero FJ, Peris-Martínez C. Which are the best parameters to obtain proteins and malondialdehyde from a tear sample? Exp Eye Res 2019; 188:107656. [PMID: 31028749 DOI: 10.1016/j.exer.2019.04.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 04/04/2019] [Accepted: 04/23/2019] [Indexed: 11/20/2022]
Abstract
Predictive, preventive and personalized medicine (PPPM) is a current concept in healthcare based on the analysis of biomarkers through non-invasive methods. Biomarkers for inflammation and oxidative stress are especially used for screening. Quantification of tear total protein content is important to identify potential, specific biomarkers, such as malondialdehyde concerning oxidative stress. The Schirmer strip test is an accessible and simple method for tear analysis. However, it is limited by the low concentration of biomarkers in the human tear. In this preliminary study, different procedures were compared for the extraction of tear proteins and malondialdehyde. Schirmer strips were used to obtain tears from healthy subjects. Ionic strength and surfactant agents were assessed, as well as different centrifugation parameters. Finally, several volumes of n-butanol on the process of malondialdehyde extraction were evaluated. The results showed that ionic strength strongly influences the extraction process, although most studies have suggested that surfactant agents are the most relevant factor; the most efficient results were obtained using a 2 M solution of NaCl in phosphate buffered saline. Regarding centrifugation, leaving the Schirmer strip tip left hanging outside the tube cap and using 1000 rpm was the best option, which is a lower centrifugation speed than the usually reported on literature. Moreover, 250 μL was the optimal n-butanol volume for malondialdehyde extraction. The importance of this study relies on the increasing relevance of the biomarkers in the field of PPPM and the need of a standardized method to extract biomarkers from the tears, to optimise its use.
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Affiliation(s)
- Ramón Calvo
- Facultad de Medicina, Universidad Católica de Valencia 'San Vicente Mártir', C/ Quevedo, 2, 46001, Valencia, Spain; Hospital General Universitario de Valencia, Av. Tres Cruces 2, 46014, Valencia, Spain.
| | - Daniel López-Malo
- Universidad Europea de Valencia, Av. Aragón, 30, 46021, Valencia, Spain
| | - Mariola Penadés
- FISABIO Oftalmología Médica (FOM), Av. Pío Baroja 12, 46015, Valencia, Spain; Thematic Cooperative Health Network for Research in Ophthalmology (Oftared), Carlos III Health Institute, Madrid, Spain
| | - F J Romero
- Universidad Europea de Valencia, Av. Aragón, 30, 46021, Valencia, Spain
| | - Cristina Peris-Martínez
- Facultad de Medicina, Universidad Católica de Valencia 'San Vicente Mártir', C/ Quevedo, 2, 46001, Valencia, Spain; FISABIO Oftalmología Médica (FOM), Av. Pío Baroja 12, 46015, Valencia, Spain; Thematic Cooperative Health Network for Research in Ophthalmology (Oftared), Carlos III Health Institute, Madrid, Spain
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23
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Nättinen J, Jylhä A, Aapola U, Mäkinen P, Beuerman R, Pietilä J, Vaajanen A, Uusitalo H. Age-associated changes in human tear proteome. Clin Proteomics 2019; 16:11. [PMID: 30976209 PMCID: PMC6441198 DOI: 10.1186/s12014-019-9233-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 03/25/2019] [Indexed: 12/22/2022] Open
Abstract
Background Prevalence of many eye and ocular surface diseases increases with age. While the clinical characteristics and pathophysiologic mechanisms of these conditions are often either known or extensively studied, the effects of normal aging on tear film and ocular surface have not been as widely researched. Methods In order to examine the effects of aging on tear fluid proteomics, tear fluid samples were collected preoperatively from 115 subjects undergoing strabismus or refractive surgery using glass microcapillary tubes. In addition to their refractive error or strabismus, the subjects did not have any other current, known eye diseases. The non-pooled samples were analysed using NanoLC-TripleTOF implementing a sequential window acquisition of all theoretical fragment ion spectra mass spectrometry, resulting in quantified data of 849 proteins. Results According to correlation results, 17 tear proteins correlated significantly with increased age and many of these proteins were connected to inflammation, immune response and cell death. According to enrichment analysis, growth and survival of cells decreased while immune response and inflammation increased with aging. We also discovered several well-known, activated and inhibited upstream regulators, e.g. NF-κB, which has been previously connected to aging in numerous previous studies. Conclusions Overall, the results show the common age-dependent alterations in tear fluid protein profile, which demonstrate similar age-associated alterations of biological functions previously shown in other tissue and sample types. Electronic supplementary material The online version of this article (10.1186/s12014-019-9233-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Janika Nättinen
- 1SILK, Department of Ophthalmology, Faculty of Medicine and Health Technology, Tampere University, PL 100, 33014 Tampere, Finland
| | - Antti Jylhä
- 1SILK, Department of Ophthalmology, Faculty of Medicine and Health Technology, Tampere University, PL 100, 33014 Tampere, Finland
| | - Ulla Aapola
- 1SILK, Department of Ophthalmology, Faculty of Medicine and Health Technology, Tampere University, PL 100, 33014 Tampere, Finland
| | | | - Roger Beuerman
- 1SILK, Department of Ophthalmology, Faculty of Medicine and Health Technology, Tampere University, PL 100, 33014 Tampere, Finland.,3Singapore Eye Research Institute, Singapore, Singapore.,4Duke-NUS Medical School Ophthalmology and Visual Sciences Academic Clinical Program, Singapore, Singapore
| | | | - Anu Vaajanen
- 5Tays Eye Centre, Tampere University Hospital, Tampere, Finland
| | - Hannu Uusitalo
- 1SILK, Department of Ophthalmology, Faculty of Medicine and Health Technology, Tampere University, PL 100, 33014 Tampere, Finland.,5Tays Eye Centre, Tampere University Hospital, Tampere, Finland
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Abstract
INTRODUCTION Tear fluid osmolarity has been increasingly accepted as an accessible parameter in the diagnosis of ocular surface and dry eye disease. After having been proposed as the gold standard, recent results have put this into question. However, the most recent guidelines for dry eye disease identify specific values of osmolarity as thresholds to help to differentiate between various stages of severity of ocular surface disease. The limits of this approach were investigated to propose a new concept, that of osmokinetics. MATERIALS AND METHODS Available data on tear fluid osmolarity in normal and diseased eyes were compared. The possibility of normo-osmolar dry eye was investigated and repeated measurements of osmolarity performed. RESULTS The currently applied static model of a threshold value of osmolarity for diagnosing dry eye disease is apparently insufficient. Not only does it not take into account normo-osmolar dry eye, but it also applies too much significance to a single parameter. Instead, it was found that there is a daily variation in osmolarity (DVO), which appears to be higher in eyes with tear film deficiencies than in healthy eyes. DISCUSSION Tear film osmolarity does vary considerably throughout the day. Its value should be considered in a kinetic model taking into account the dynamics of osmolarity changes moreso than the current static model. The terms of osmotic stress and diurnal variation of osmolarity were found to offer a more physiological understanding of osmolarity. CONCLUSION A more dynamic model for osmolarity is presented in which not the value itself but the daily variation of osmolarity is identified. It is suggested that the amplitude of change in osmolarity over the course of a day or even shorter time periods could play a decisive role as a stress factor for the surface cells. The varying osmolar stress could be one of the key mechanisms leading to the cell death, inflammation, apoptosis, and goblet cell disappearance as observed in dry eye disease. Perhaps it is the mean osmolarity level at which these changes occur together with the magnitude of DVO which could identify the level of severity of dry eye disease.
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Affiliation(s)
- G-B van Setten
- St Eriks Eye Hospital, Karolinska Institutet, Polhemsgatan 50, 11282 Stockholm, Sweden.
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25
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Boerger M, Funke S, Leha A, Roser AE, Wuestemann AK, Maass F, Bähr M, Grus F, Lingor P. Proteomic analysis of tear fluid reveals disease-specific patterns in patients with Parkinson's disease - A pilot study. Parkinsonism Relat Disord 2019; 63:3-9. [PMID: 30876839 DOI: 10.1016/j.parkreldis.2019.03.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 02/14/2019] [Accepted: 03/01/2019] [Indexed: 12/13/2022]
Abstract
BACKGROUND The diagnosis of Parkinson's disease (PD) is still challenging and biomarkers could contribute to an improved diagnostic accuracy. Tear fluid (TF) is an easily accessible body fluid reflecting pathophysiological changes in systemic and ocular diseases and is already used as a biomarker source for several ophthalmological disorders. Here, we analyzed the TF of patients with PD and controls (CTR) to describe disease-related changes in TF and identify putative biomarkers for the diagnosis of PD. METHODS Unstimulated TF samples of a pilot cohort with 36 PD patients and 18 CTR were collected via Schirmer tear test strips and then analyzed via a Bottom-up liquid chromatography electrospray ionization tandem mass spectrometry (BULCMS) workflow, followed by functional analysis encompassing protein-protein interaction as well as cellular component and pathway analysis. RESULTS BULCMS analysis lead to the identification of 571 tear proteins (false discovery rate, FDR < 1%), whereby 31 proteins were exclusively detected in the PD group and 7 only in the CTR group. Whereas 21 proteins were significantly increased in the PD versus CTR groups, 19 proteins were significantly decreased. Core networks of proteins involved in immune response, lipid metabolism and oxidative stress were distinctly altered in PD patients. CONCLUSIONS To our best knowledge, this is the first description of TF proteome in PD patients. Tear protein level alterations suggest the contribution of different disease-related mechanisms in ocular pathology in PD and propose candidate proteins to be validated as potential biomarkers in larger cohorts.
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Affiliation(s)
- Matthias Boerger
- Department of Neurology, University Medical Center Göttingen, Göttingen, Germany.
| | - Sebastian Funke
- Department of Ophthalmology, University Medical Center Mainz, Experimental and Translational Ophthalmology, Mainz, Germany.
| | - Andreas Leha
- Department of Medical Statistics, University Göttingen, Facility for Medical Biometry and Statistical Bioinformatics, Göttingen, Germany.
| | - Anna-Elisa Roser
- Department of Neurology, University Medical Center Göttingen, Göttingen, Germany; Deutsche Forschungsgemeinschaft - German Research Center for Nanoscale Microscopy and Molecular Physiology of the Brain, Göttingen, Germany.
| | - Ann-Katrin Wuestemann
- Department of Ophthalmology, University Medical Center Mainz, Experimental and Translational Ophthalmology, Mainz, Germany.
| | - Fabian Maass
- Department of Neurology, University Medical Center Göttingen, Göttingen, Germany.
| | - Mathias Bähr
- Department of Neurology, University Medical Center Göttingen, Göttingen, Germany; Deutsche Forschungsgemeinschaft - German Research Center for Nanoscale Microscopy and Molecular Physiology of the Brain, Göttingen, Germany.
| | - Franz Grus
- Department of Ophthalmology, University Medical Center Mainz, Experimental and Translational Ophthalmology, Mainz, Germany.
| | - Paul Lingor
- Department of Neurology, University Medical Center Göttingen, Göttingen, Germany; Deutsche Forschungsgemeinschaft - German Research Center for Nanoscale Microscopy and Molecular Physiology of the Brain, Göttingen, Germany; Klinikum Rechts der Isar der Technischen Universität München, Munich, Germany.
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Sebbag L, McDowell EM, Hepner PM, Mochel JP. Effect of tear collection on lacrimal total protein content in dogs and cats: a comparison between Schirmer strips and ophthalmic sponges. BMC Vet Res 2018; 14:61. [PMID: 29490661 PMCID: PMC5831202 DOI: 10.1186/s12917-018-1390-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 02/23/2018] [Indexed: 12/27/2022] Open
Abstract
Background Quantification of lacrimal total protein content (TPC) is an important tool for clinical scientists to understand disease pathogenesis, identify potential biomarkers and assess response to therapy, among other applications. However, TPC is not only affected by disease state but also by the method used for tear collection. Thus, the purpose of this study is to determine the impact on TPC of two methods of tear collection in dogs and cats: Schirmer strips and polyvinyl acetal (PVA) sponges. Methods (i) In vivo - Ten healthy dogs and 10 healthy cats were examined. Each animal underwent two sessions, separated by 10 min, in which a Schirmer strip was placed in one randomly selected eye until the 20-mm mark was reached, while a strip of PVA sponge was placed in the other eye for 1 min. (ii) In vitro - Schirmer strips and PVA sponges were spiked with various volumes of four bovine serum albumin solutions (0.5, 4, 10, and 20 mg/mL). In both experiments, the wetted absorbent materials were centrifuged for 1 min, and the TPC was quantified on the extracted fluid using Direct Detect™ infrared spectroscopy. Results Lacrimal TPC in dogs and cats ranged from 5.2 to 14.6 mg/mL and from 6.2 to 20.6 mg/mL, respectively. In cats, TPC was significantly lower with Schirmer strips vs. PVA sponges (P < 0.001). In dogs, the volume absorbed by PVA sponges was negatively correlated with TPC (r = − 0.48, P = 0.033). The inter-session coefficient of variation was significantly lower with Schirmer strips vs. PVA sponges in both species (P ≤ 0.010). In vitro, both absorbent materials resulted in a ‘concentrating effect’ of the TPC obtained post-centrifugation, which was most pronounced when the volume absorbed was low, especially for Schirmer strips. Conclusion Schirmer strips provide a repeatable method to quantify lacrimal TPC in dogs and cats, although care should be taken to absorb sufficient volumes of tears to minimize the concentrating effect from the absorbent material.
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Affiliation(s)
- Lionel Sebbag
- Department of Veterinary Clinical Sciences, Iowa State University, College of Veterinary Medicine, Ames, IA, 50011, USA.
| | - Emily M McDowell
- Lloyd Veterinary Medical Center, Iowa State University, College of Veterinary Medicine, Ames, IA, 50011, USA
| | - Patrick M Hepner
- Lloyd Veterinary Medical Center, Iowa State University, College of Veterinary Medicine, Ames, IA, 50011, USA
| | - Jonathan P Mochel
- Department of Biomedical sciences, Iowa State University, College of Veterinary Medicine, Ames, IA, 50011, USA
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Mrugacz M, Ostrowska L, Bryl A, Szulc A, Zelazowska-Rutkowska B, Mrugacz G. Pro-inflammatory cytokines associated with clinical severity of dry eye disease of patients with depression. Adv Med Sci 2017; 62:338-344. [PMID: 28511072 DOI: 10.1016/j.advms.2017.03.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 01/16/2017] [Accepted: 03/09/2017] [Indexed: 10/19/2022]
Abstract
PURPOSE The aim of this study was to assess the correlation of inflammatory cytokines levels in tears with severity of dry eye disease in a cohort of patients with depression. MATERIAL AND METHODS Tear fluid samples were collected from 32 patients with depression treated with antidepressants, and 34 healthy subjects. Cytokines were assessed by ELISA. All the subjects completed the Beck Depression Inventory and performed the ophthalmic examination, including dry eye tests. RESULTS The tear fluid levels of IL-6, IL-17 and TNF-α in depressive patients were higher than in controls. The clinical severity of dry eye disease correlated significantly with the IL-17 and TNF-α levels. CONCLUSIONS Our results suggest a crucial role of inflammatory cytokines, especially IL-17 and TNF-α, in the development of severe dry eye disease in patients with depression. Clarification of the role pro-inflammatory cytokines in the pathogenesis of ocular findings in depressive patients may be useful in establishing immunotherapeutic strategies for this disease.
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Abstract
Lipidomics is the identification and quantitation of changes in the lipidome of a cell, tissue, organ or biofluid in health and disease using high resolution mass spectrometry. Lipidome of a particular organism has relevance to the disease manifestation as it reflects the metabolic changes which can be a consequence of the disease. Hence these changes in the molecules can be considered as potential markers for screening and early detection of the disease. Biological fluids as blood/serum/plasma, urine, saliva, tear and cerebrospinal fluid, due to their accessibility, offer ease of collection with minimal or no discomfort to the patient and provide a ready footprint of the metabolic changes occurring during disease. This review provides a brief introduction to lipidomics and its role in understanding the metabolic changes in health and disease followed by discussion on the chemical diversity of the lipid species and their biological role, mammalian lipids and their metabolism and role of lipids in pathogens and the immune response before dwelling further into importance of studying lipidome in various biological fluids. The challenges in performing a lipidomic analysis at the experimental and data analysis stages are discussed.
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Affiliation(s)
- Arkasubhra Ghosh
- GROW Research Laboratory, Narayana Nethralaya Foundation, Narayana Health City, # 258/A, Bommasandra, Hosur Road, Bangalore, 560 099, India
| | - Krishnatej Nishtala
- GROW Research Laboratory, Narayana Nethralaya Foundation, Narayana Health City, # 258/A, Bommasandra, Hosur Road, Bangalore, 560 099, India.
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Abstract
Planaria are soft-bodied, bilateral flatworms of the phylum Platyhelminthes. They are covered in cilia and use ciliary-gliding to traverse the substratum while hunting. Their body surface is covered in a layer of viscous slime primarily derived from specialised secretory granules known as rhabdites. The slime must somehow stay associated with the surface of the animal in aqueous environments whilst also lubricating the interface of the animal and the surfaces over which the animal moves. The slime prevents damage to the animal's soft body and also contributes to adhesion to the substratum. In order to gain insight into how it might achieve these diverse functions, we performed electron microscopic examination of the slime's structure. Analysis of two freshwater flatworms from the UK Schmidtea polychroa (Schmidt, 1861) and Polycelis tenuis (Ijima, 1884) revealed a high level of organisation of the slime layer and a variety of ejected slime structures. We show that these structures are rich in sulphated glycosaminoglycans (sGAGs). Most of these (269 of 285 examined) appear to be topologically closed spheroids that we name ball-GAGs. Another class appears to burst to release flower- and star-like clusters which adhere to motile cilia. We also observe fibrous nets that are associated with entrapped bacteria. Examination of the structure of rhabdites ejected onto a porous surface suggests a mechanism by which their structure allows them to both bind to the porous surface and provide a smooth layer over which the animal could glide. Such sGAG-based structures might provide models for the design of artificial biomimetic replacements for tears, saliva, bio-compatible lubricants or drug-delivery vehicles.
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Affiliation(s)
- Matthew J Hayes
- EM Unit, UCL Institute of Ophthalmology, 11-43 Bath Street, London EC1V 9EL, UK
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Hagan S, Martin E, Enríquez-de-Salamanca A. Tear fluid biomarkers in ocular and systemic disease: potential use for predictive, preventive and personalised medicine. EPMA J 2016; 7:15. [PMID: 27413414 PMCID: PMC4942926 DOI: 10.1186/s13167-016-0065-3] [Citation(s) in RCA: 196] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Accepted: 06/03/2016] [Indexed: 11/10/2022]
Abstract
In the field of predictive, preventive and personalised medicine, researchers are keen to identify novel and reliable ways to predict and diagnose disease, as well as to monitor patient response to therapeutic agents. In the last decade alone, the sensitivity of profiling technologies has undergone huge improvements in detection sensitivity, thus allowing quantification of minute samples, for example body fluids that were previously difficult to assay. As a consequence, there has been a huge increase in tear fluid investigation, predominantly in the field of ocular surface disease. As tears are a more accessible and less complex body fluid (than serum or plasma) and sampling is much less invasive, research is starting to focus on how disease processes affect the proteomic, lipidomic and metabolomic composition of the tear film. By determining compositional changes to tear profiles, crucial pathways in disease progression may be identified, allowing for more predictive and personalised therapy of the individual. This article will provide an overview of the various putative tear fluid biomarkers that have been identified to date, ranging from ocular surface disease and retinopathies to cancer and multiple sclerosis. Putative tear fluid biomarkers of ocular disorders, as well as the more recent field of systemic disease biomarkers, will be shown.
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Affiliation(s)
- Suzanne Hagan
- Department of Life Sciences, Vision Sciences, Glasgow Caledonian University (GCU ), G4 0BA Glasgow, Scotland, UK
| | - Eilidh Martin
- Department of Life Sciences, Vision Sciences, Glasgow Caledonian University (GCU ), G4 0BA Glasgow, Scotland, UK
| | - Amalia Enríquez-de-Salamanca
- Institute of Applied Ophthalmobiology (IOBA), University of Valladolid, Valladolid, Spain ; Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Valladolid, Spain
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Aass C, Norheim I, Eriksen EF, Thorsby PM, Pepaj M. Single unit filter-aided method for fast proteomic analysis of tear fluid. Anal Biochem 2015; 480:1-5. [PMID: 25862084 DOI: 10.1016/j.ab.2015.04.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 03/31/2015] [Accepted: 04/01/2015] [Indexed: 12/26/2022]
Abstract
Human tear fluid is a complex mixture containing high concentrations of proteins and is increasingly becoming an important source for studying protein biomarkers of eye-related diseases such as Graves' ophthalmopathy. Today, the Schirmer tear test is the most widely used technique for tear collection. However, sample handling and protein extraction from these strips have been highly challenging. Cutting and removal of the Schirmer strips after extraction, which may lead to sample loss prior to downstream analysis, are some of the challenges to consider. To address some of these limitations, we have developed a single-unit filter-aided method for both sample handling and protein extraction. In addition, we systematically investigated the most suitable conditions for protein extraction from these strips. Among the different extraction conditions applied, extraction with 100 mM ammonium bicarbonate containing 50 mM NaCl resulted in the highest number of identified proteins using one-dimensional liquid chromatography tandem mass spectrometry (LC-MS/MS). Moreover, 1526 proteins were identified when the optimized extraction method was combined with two-dimensional LC-MS/MS analysis, demonstrating the applicability of this novel approach to the study of the tear proteome. This dataset of identified proteins represents a comprehensive catalogue of the tear proteome and may serve as a list for future biomarker research.
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Affiliation(s)
- Cecilie Aass
- Hormone Laboratory, Department of Medical Biochemistry, Oslo University Hospital, 0424 Oslo, Norway.
| | - Ingrid Norheim
- Department of Endocrinology, Oslo University Hospital, 0424 Oslo, Norway
| | - Erik Fink Eriksen
- Department of Endocrinology, Oslo University Hospital, 0424 Oslo, Norway
| | - Per M Thorsby
- Hormone Laboratory, Department of Medical Biochemistry, Oslo University Hospital, 0424 Oslo, Norway
| | - Milaim Pepaj
- Hormone Laboratory, Department of Medical Biochemistry, Oslo University Hospital, 0424 Oslo, Norway
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Perumal N, Funke S, Pfeiffer N, Grus FH. Characterization of lacrimal proline-rich protein 4 (PRR4) in human tear proteome. Proteomics 2014; 14:1698-709. [PMID: 24782455 DOI: 10.1002/pmic.201300039] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Revised: 02/11/2014] [Accepted: 04/25/2014] [Indexed: 01/06/2023]
Abstract
This study was initiated considering the lack of comprehensive characteristics profile of PRR4 in tears of healthy subjects. Therefore, detailed characterizations of PRR4 from basal tears employing in-gel and in-solution digestions for MS systems are presented herein. First, pooled tear samples (n = 10) were utilized to identify PRR4-rich region/spots in 1DE/2DE gels employing LC-MALDI-MS and 1DE-LC-ESI-LTQ-Orbitrap-MS systems. PRR4-rich region and ten spots with vast polymorphisms (Mr : 17-30 kDa, pI: 3.0-6.6) were identified in 1DE and 2DE gels, respectively. In addition, combinations of four types of PTMs, which are methylation, acetylation, oxidation, and pyroglutamate formation, were identified in these ten PRR4 spots. Furthermore, a targeted data-acquisition approach was utilized to identify PRR4 isoforms in individual tear samples (n = 61) by in-solution digestion combined with a LC-ESI-LTQ-Orbitrap-MS system. Importantly, a new PRR4 isoform designated as PRR4-N3 in addition to PRR4 (gi154448886) and pHL E1F1 (gi1050983) was identified. Moreover, different combinations of these three PRR4 isoforms identified in the individual tear samples could be categorized into six distinguished groups. Conclusively, these findings provide fundamental insight into the complex characteristics profile of PRR4 isoforms and their PTMs in tears of healthy individuals.
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Affiliation(s)
- Natarajan Perumal
- Department of Ophthalmology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
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Ihnatko R, Edén U, Lagali N, Dellby A, Fagerholm P. Analysis of protein composition and protein expression in the tear fluid of patients with congenital aniridia. J Proteomics 2013; 94:78-88. [PMID: 24061003 DOI: 10.1016/j.jprot.2013.09.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 08/14/2013] [Accepted: 09/05/2013] [Indexed: 01/13/2023]
Abstract
UNLABELLED Aniridia is a rare congenital genetic disorder caused by haploinsuffiency of the PAX6 gene, the master gene for development of the eye. The expression of tear proteins in aniridia is unknown. To screen for proteins involved in the aniridia pathophysiology, the tear fluid of patients with diagnosed congenital aniridia was examined using two-dimensional electrophoresis (2-DE) and liquid chromatography-tandem mass spectrometry (LC-MS/MS). Two-dimensional map of tear proteins in aniridia has been established and 7 proteins were differentially expressed with P<0.01 between aniridia patients and control subjects. Five of them were more abundant in healthy subjects, particularly α-enolase, peroxiredoxin 6, cystatin S, gelsolin, apolipoprotein A-1 and two other proteins, zinc-α2-glycoprotein and lactoferrin were more expressed in the tears of aniridia patients. Moreover, immunoblot analysis revealed elevated levels of vascular endothelial growth factor (VEGF) in aniridia tears which is in concordance with clinical finding of pathological blood and lymph vessels in the central and peripheral cornea of aniridia patients. The proteins with different expression in patients' tears may be new candidate molecules involved in the pathophysiology of aniridia and thus may be helpful for development of novel treatment strategies for the symptomatic therapy of this vision threatening condition. BIOLOGICAL SIGNIFICANCE This study is first to demonstrate protein composition and protein expression in aniridic tears and identifies proteins with different abundance in tear fluid from patients with congenital aniridia vs. healthy tears.
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Affiliation(s)
- Robert Ihnatko
- Integrative Regenerative Medicine Centre and Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, 581 85 Linköping, Sweden.
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Miyakoshi A, Takemoto M, Shiraki K, Hayashi A. Varicella-zoster virus keratitis with asymptomatic conjunctival viral shedding in the contralateral eye. Case Rep Ophthalmol 2012; 3:343-8. [PMID: 23162462 PMCID: PMC3499208 DOI: 10.1159/000343463] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Purpose To report a case of varicella-zoster virus (VZV) keratitis with detection of VZV DNA in the tear fluid of not only the symptomatic eye but also the contralateral asymptomatic eye by polymerase chain reaction (PCR). Methods This is a case report. A 63-year-old otherwise healthy woman presented with circular corneal ulcer and stromal opacity with infiltration accompanied by mild conjunctival and ciliary injections in the left eye. Bacterial cultures of the corneal scrapings and virus PCR analyses of tear fluid from both eyes were performed. Results No pathogen was found by bacterial cultures. PCR was negative for Acanthamoeba, herpes simplex virus and cytomegalovirus, but positive for VZV. VZV DNA was also detected in the unaffected eye. Based on the diagnosis of VZV keratitis, oral valacyclovir and acyclovir eye ointment were administered to the corneal infected eye. The infected eye was healed and VZV DNA turned negative in the tear fluid of the treated eye after 6 months of treatment; however, VZV DNA was still positive in the tear fluid of the contralateral eye. Conclusions To our knowledge, this is the first case report of the detection of VZV DNA in the tear fluid of both affected and unaffected eyes in a patient with VZV keratitis. Asymptomatic conjunctival shedding of VZV may continue in the healthy unaffected eye in VZV keratitis patients.
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Affiliation(s)
- Akio Miyakoshi
- Department of Ophthalmology, University of Toyama, Toyama, Japan
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