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https://www.readbyqxmd.com/read/28637904/ifn-%C3%AE-expressing-th17-cells-are-required-for-development-of-severe-ocular-surface-autoimmunity
#1
Yihe Chen, Sunil K Chauhan, Chunyi Shao, Masahiro Omoto, Takenori Inomata, Reza Dana
Th17 cells are critical effectors mediating the ocular surface autoimmunity in dry eye disease (DED). Increased IFN-γ has also been implicated in DED; however, it remains unclear to what extent Th1 cells contribute to DED pathogenesis. In this study, we investigated the cellular source of IFN-γ and assessed its contribution to corneal epitheliopathy in DED mice. We discovered a significant IL-17A(+)IFN-γ(+) (Th17/1) population and determined that these cells are derived from Th17 precursors. Adoptive transfer of Th17/1, but not Th1, cells confers the disease to naive recipients as effectively as do Th17 cells alone...
June 21, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28576753/the-function-of-regulatory-t-cells-at-the-ocular-surface-review
#2
REVIEW
William Foulsham, Anna Marmalidou, Afsaneh Amouzegar, Giulia Coco, Yihe Chen, Reza Dana
Regulatory T cells (Tregs) are critical modulators of immune homeostasis. Tregs maintain peripheral tolerance to self-antigens, thereby preventing autoimmune disease. Furthermore, Tregs suppress excessive immune responses deleterious to the host. Recent research has deepened our understanding of how Tregs function at the ocular surface. This manuscript describes the classification, the immunosuppressive mechanisms, and the phenotypic plasticity of Tregs. We review the contribution of Tregs to ocular surface autoimmune disease, as well as the function of Tregs in allergy and infection at the ocular surface...
May 30, 2017: Ocular Surface
https://www.readbyqxmd.com/read/28528121/determinants-of-ocular-pain-severity-in-patients-with-dry-eye-disease
#3
Vannarut Satitpitakul, Ahmad Kheirkhah, Alja Crnej, Pedram Hamrah, Reza Dana
PURPOSE: To quantify the severity of ocular pain in patients with dry eye disease (DED) and evaluate factors associated with pain severity. DESIGN: Cross-sectional study. METHODS: Eighty-four patients with DED were asked to score their severity level of ocular pain using a 10-point scale, with 10 indicating the most severe pain. All patients also had a comprehensive ophthalmic assessment including a detailed history, Ocular Surface Disease Index (OSDI) questionnaire, and ocular surface examination...
May 17, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28481835/patients-perceived-treatment-effectiveness-in-dry-eye-disease
#4
Ahmad Kheirkhah, Alja Crnej, Ai Ren, Andrew Mullins, Vannarut Satitpitakul, Pedram Hamrah, Debra Schaumberg, Reza Dana
PURPOSE: Patients' perceptions of the effectiveness of a treatment, or perceived treatment effectiveness (PTE), play an important role in medicine. This study aimed to evaluate patients' PTE in dry eye disease (DED) and investigate factors contributing to these patients' perceptions. METHODS: This cross-sectional study included 66 patients with DED. At enrollment, all patients had comprehensive ophthalmic assessment. In addition, to evaluate the patient's PTE, they were asked to use a 10-point scale ranging from "strongly disagree (score 1)" to "strongly agree (score 10)" to score their views on whether their DED treatments had been effective...
May 3, 2017: Cornea
https://www.readbyqxmd.com/read/28445703/sensitivity-and-specificity-of-laser-scanning-in-vivo-confocal-microscopy-for-filamentous-fungal-keratitis-role-of-observer-experience
#5
Ahmad Kheirkhah, Zeba A Syed, Vannarut Satitpitakul, Sunali Goyal, Rodrigo Müller, Elmer Y Tu, Reza Dana
PURPOSE: To determine sensitivity and specificity of laser-scanning in vivo confocal microscopy (LS-IVCM) for detection of filamentous fungi in patients with microbial keratitis and to evaluate the effect of observer's imaging experience on these parameters. DESIGN: Retrospective, reliability study METHODS: This study included 21 patients with filamentous fungal keratitis and 24 patients with bacterial keratitis (as controls). The etiology of infection was confirmed based on the response to specific therapy regardless of culture results...
April 23, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28445193/a-pilot-randomized-trial-on-safety-and-efficacy-of-a-novel-topical-combined-inhibitor-of-janus-kinase-1-3-and-spleen-tyrosine-kinase-for-gvhd-associated-ocular-surface-disease
#6
Ahmad Kheirkhah, Antonio Di Zazzo, Vannarut Satitpitakul, Merle Fernandez, Daniel Magilavy, Reza Dana
PURPOSE: Janus kinase (JAK) and spleen tyrosine kinase (SYK) play critical functions in T-cell activation and in inflammation. Because of their antiinflammatory effects, JAK and SYK inhibitors have recently been evaluated in several immunopathogenic disorders. This pilot study was designed to assess the safety and efficacy of a topical combined JAK/SYK inhibitor, R348, ophthalmic solution for treatment of ocular surface disease in graft-versus-host disease (GVHD). METHODS: This phase 2, double-masked, randomized, pilot trial included 30 patients with ocular surface disease due to GVHD who were randomized to receive topical 0...
July 2017: Cornea
https://www.readbyqxmd.com/read/28428556/treatment-of-donor-corneal-tissue-with-immunomodulatory-cytokines-a-novel-strategy-to-promote-graft-survival-in-high-risk-corneal-transplantation
#7
Maryam Tahvildari, Parisa Emami-Naeini, Masahiro Omoto, Alireza Mashaghi, Sunil K Chauhan, Reza Dana
Antigen-presenting cells (APCs) play an important role in transplant rejection and tolerance. In high-risk corneal transplantation, where the graft bed is inflamed and vascularized, immature APCs in the donor corneal stroma quickly mature and migrate to lymphoid tissues to sensitize host T cells. In this study, using a mouse model of corneal transplantation, we investigated whether enrichment of tolerogenic APCs (tolAPCs) in donor corneas can enhance graft survival in corneal allograft recipients with inflamed graft beds...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28412300/mechanisms-of-retinal-damage-after-ocular-alkali-burns
#8
Eleftherios I Paschalis, Chengxin Zhou, Fengyang Lei, Nathan Scott, Vassiliki Kapoulea, Marie-Claude Robert, Demetrios Vavvas, Reza Dana, James Chodosh, Claes H Dohlman
Alkali burns to the eye constitute a leading cause of worldwide blindness. In recent case series, corneal transplantation revealed unexpected damage to the retina and optic nerve in chemically burned eyes. We investigated the physical, biochemical, and immunological components of retinal injury after alkali burn and explored a novel neuroprotective regimen suitable for prompt administration in emergency departments. Thus, in vivo pH, oxygen, and oxidation reduction measurements were performed in the anterior and posterior segment of mouse and rabbit eyes using implantable microsensors...
June 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28375340/high-performance-analysis-of-layered-nanolithography-masks-by-a-surface-impedance-generating-operator
#9
Alireza Gholipour, Reza Faraji-Dana, Guy A E Vandenbosch
A fast computational algorithm is presented for the analysis of multilayered nanolithography masks. The technique used is an exact field-theoretical approach which can model the diffraction effects in subwavelength propagation regimes. The field scattered by the mask pattern is obtained in two steps. First, a surface impedance generating operator (SIGO) that relates the tangential electric field on the boundary of each etched area to its equivalent surface electric current is computed. Second, the exterior problem is formulated based on the equivalence theorem in electromagnetics and is combined with the SIGO model...
April 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28325361/warthin-like-papillary-renal-cell-carcinoma-clinicopathologic-morphologic-immunohistochemical-and-molecular-genetic-analysis-of-11-cases
#10
Faruk Skenderi, Monika Ulamec, Tomas Vanecek, Petr Martinek, Reza Alaghehbandan, Maria Pane Foix, Iva Babankova, Delia Perez Montiel, Isabel Alvarado-Cabrero, Marian Svajdler, Pavol Dubinský, Dana Cempirkova, Michal Pavlovsky, Semir Vranic, Ondrej Daum, Ondrej Ondic, Kristyna Pivovarcikova, Kvetoslava Michalova, Milan Hora, Pavla Rotterova, Adela Stehlikova, Martin Dusek, Michal Michal, Ondrej Hes
Oncocytic papillary renal cell carcinoma (PRCC) is a distinct subtype of PRCC, listed as a possible new variant of PRCC in the 2016 WHO classification. It is composed of papillae aligned by large single-layered eosinophilic cells showing linearly arranged oncocytoma-like nuclei. We analyzed clinicopathologic, morphologic, immunohistochemical and molecular-genetic characteristics of 11 oncocytic PRCCs with prominent tumor lymphocytic infiltrate, morphologically resembling Warthin's tumor. The patients were predominantly males (8/11, 73%), with an average age of 59years (range 14-76), and a mean tumor size of 7cm (range 1-22cm)...
April 2017: Annals of Diagnostic Pathology
https://www.readbyqxmd.com/read/28299010/systemic-immunomodulatory-strategies-in-high-risk-corneal-transplantation
#11
REVIEW
Tulio B Abud, Antonio Di Zazzo, Ahmad Kheirkhah, Reza Dana
The cornea is the most commonly transplanted tissue in the body. Although corneal grafts generally have high success rates, transplantation onto inflamed and vascularized host beds, or so-called high-risk corneal transplantation, has a high rate of graft rejection. The management of this high-risk corneal transplantation is challenging and involves numerous measures. One of the key measures to prevent graft rejection in these cases is the use of systemic immunosuppressive agents. In this article, we will review the systemic immunosuppressive agents most commonly used for high-risk corneal transplantation, which include corticosteroids, cysclosporine A, tacrolimus, mycophenolate mofetil, and rapamycin...
January 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28241321/t-cell-derived-granulocyte-macrophage-colony-stimulating-factor-contributes-to-dry-eye-disease-pathogenesis-by-promoting-cd11b-myeloid-cell-maturation-and-migration
#12
Thomas H Dohlman, Julia Ding, Reza Dana, Sunil K Chauhan
Purpose: Growing evidence suggests that granulocyte-macrophage colony-stimulating factor (GM-CSF) contributes to T helper 17 (Th17) cell-associated immunoinflammatory diseases. The purpose of this study was to evaluate the effect of T cell-derived GM-CSF on CD11b+ myeloid cell function in dry eye disease (DED). Methods: In a murine model of DED, quantitative real-time PCR and ELISA were used to measure GM-CSF expression at the ocular surface, and flow cytometry was used to enumerate GM-CSF producing Th17 cells...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28073648/elevated-neutrophil-elastase-in-tears-of-ocular-graft-versus-host-disease-patients
#13
Samer N Arafat, Marie-Claude Robert, Tulio Abud, Sandra Spurr-Michaud, Francisco Amparo, Claes H Dohlman, Reza Dana, Ilene K Gipson
PURPOSE: To investigate the levels of neutrophil elastase (NE), matrix metalloproteinases (MMPs), and myeloperoxidase (MPO) in tear washes of patients with ocular graft-vs-host disease (oGVHD). DESIGN: Case-control study. METHODS: Based on established criteria, oGVHD patients (n = 14; 28 eyes) and age-/sex-matched healthy controls (n = 14; 28 eyes) were enrolled. Tear washes were collected and analyzed for NE using a single-analyte enzyme-linked immunosorbent assay (ELISA)...
April 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28060067/patients-with-dry-eye-disease-and-low-subbasal-nerve-density-are-at-high-risk-for-accelerated-corneal-endothelial-cell-loss
#14
Ahmad Kheirkhah, Vannarut Satitpitakul, Pedram Hamrah, Reza Dana
PURPOSE: To evaluate changes in corneal endothelial cell density over time in patients with dry eye disease (DED) and to correlate endothelial cell loss with corneal subbasal nerve density. METHODS: This retrospective study included 40 eyes of 20 patients with DED. Laser in vivo confocal microscopy had been performed in the central cornea of both eyes at an initial visit and repeated after a mean follow-up of 33.2 ± 10.2 months. The densities of corneal endothelial cells and subbasal nerves were measured in both visits and compared with 13 eyes of 13 normal age-matched controls...
February 2017: Cornea
https://www.readbyqxmd.com/read/28060028/kinetics-of-angiogenic-responses-in-corneal-transplantation
#15
Takenori Inomata, Alireza Mashaghi, Antonio Di Zazzo, Sang-Mok Lee, Homer Chiang, Reza Dana
PURPOSE: To delineate and compare the kinetics of corneal angiogenesis after high-risk (HR) versus low-risk (LR) corneal transplantation. METHODS: In mice, intrastromal sutures were placed in the recipient graft bed 2 weeks before allogeneic transplantation to induce angiogenesis and amplify the risk of graft rejection. Control (LR) graft recipients did not undergo suture placement, and thus the host bed remained avascular at the time of transplantation. Graft hemangiogenesis and opacity scores were evaluated for 8 weeks by slit-lamp biomicroscopy...
April 2017: Cornea
https://www.readbyqxmd.com/read/28012874/management-of-high-risk-corneal-transplantation
#16
REVIEW
Antonio Di Zazzo, Ahmad Kheirkhah, Tulio B Abud, Sunali Goyal, Reza Dana
The cornea is the most commonly transplanted tissue in medicine. The main cause of corneal graft failure is allograft rejection. The incidence of graft rejection depends on the presence of high-risk characteristics, most notably corneal neovascularization. Although corneal grafting has a high success rates in the absence of these risk factors, high-risk keratoplasty is associated with low success rates because of a high incidence of immune-mediated graft rejection. To improve the survival of high-risk corneal transplantation, various preoperative, intraoperative, and postoperative measures can be considered...
December 21, 2016: Survey of Ophthalmology
https://www.readbyqxmd.com/read/28008995/impaired-function-of-peripherally-induced-regulatory-t-cells-in-hosts-at-high-risk-of-graft-rejection
#17
Takenori Inomata, Jing Hua, Antonio Di Zazzo, Reza Dana
Regulatory T cells (Tregs) are crucial for allograft survival. Tregs can be divided into thymus-derived natural Tregs (tTregs) and peripherally-derived induced Tregs (pTregs). Here, we determine whether the suppressive function of Treg subsets is hampered in hosts who are at high risk for rejecting their graft. To induce graft beds that promote high risk of transplant rejection, intrastromal corneal sutures were placed two weeks prior to the transplant procedure in mice. We demonstrate that in high-risk recipients the frequencies and function of pTregs (but not tTregs) are suppressed...
December 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27899224/interleukin-7-and-15-maintain-pathogenic-memory-th17-cells-in-autoimmunity
#18
Yihe Chen, Sunil K Chauhan, Xuhua Tan, Reza Dana
Th17 cells are principal mediators of many autoimmune conditions. Recently, memory Th17 cells have been revealed as crucial in mediating the chronicity of various refractory autoimmune disorders; however, the underlying mechanisms maintaining memory Th17 cells have remained elusive. Here, using a preclinical model of ocular autoimmune disease we show that both IL-7 and IL-15 are critical for maintaining pathogenic memory Th17 cells. Neutralization of these cytokines leads to substantial reduction of memory Th17 cells; both IL-7 and IL-15 provide survival signals via activating STAT5, and IL-15 provides additional proliferation signals via activating both STAT5 and Akt...
February 2017: Journal of Autoimmunity
https://www.readbyqxmd.com/read/27811567/patients-with-dry-eye-disease-and-low-subbasal-nerve-density-are-at-high-risk-for-accelerated-corneal-endothelial-cell-loss
#19
Ahmad Kheirkhah, Vannarut Satitpitakul, Pedram Hamrah, Reza Dana
PURPOSE: To evaluate changes in corneal endothelial cell density over time in patients with dry eye disease (DED) and to correlate endothelial cell loss with corneal subbasal nerve density. METHODS: This retrospective study included 40 eyes of 20 patients with DED. Laser in vivo confocal microscopy had been performed in the central cornea of both eyes at an initial visit and repeated after a mean follow-up of 33.2 ± 10.2 months. The densities of corneal endothelial cells and subbasal nerves were measured in both visits and compared with 13 eyes of 13 normal age-matched controls...
November 2, 2016: Cornea
https://www.readbyqxmd.com/read/27770942/an-electrical-bio-chip-to-transfer-and-detect-electromagnetic-stimulation-on-the-cells-based-on-vertically-aligned-carbon-nanotubes
#20
Saeed Rafizadeh-Tafti, Mohammad Hossein Haqiqatkhah, Mehrdad Saviz, Mohsen Janmaleki, Reza Faraji Dana, Somayeh Zanganeh, Mohammad Abdolahad
A highly sensitive impedimetric bio-chip based on vertically aligned multiwall carbon nanotubes (VAMWCNTs), was applied in direct interaction with lung cancer cells. Our tool provided both inducing and monitoring the bioelectrical changes in the cells initiated by electromagnetic (EM) wave stimulation. EM wave of 940MHz frequency with different intensities was used. Here, wave ablation might accumulate electrical charge on the tips of nanotubes penetrated into cell's membrane. The charge might induce ionic exchanges into the cell and cause alterations in electrical states of the membrane...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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