Definition of Uveitis Refractory to Treatment: A Systematic Review in the Absence of a Consensus

Egyptian Consensus Guidance for Treatment of Adults with Non-Infectious Uveitis

PURPOSE

Developing and setting up an Egyptian consensus for the management of NIU.

METHODS

A two-phase survey was implemented to obtain expert opinions from Egyptian specialists in the management of non-infectious uveitis. A core team of specialists in management of NIU formulated 21 clinical questions that were structured according to the PICO format (population, intervention, comparison, and the outcome). The literature review team conducted a systemic literature review to address the PICO questions. Based on literature search, a set of 21 sectioned recommendation statements were developed.

RESULTS

The differences in ethnicity and socioeconomic standards of the Egyptian population raised the need to develop an Egyptian consensus guidance for management of NIU. The management statements developed in this work were based on a thorough review of the literature and consensus agreement of a national expert panel. Systemic immunosuppression should be initiated during steroid tapering and should be used as first line along with steroids in case of underlying systemic disease. The panel recommended that maintenance dose of steroids should not exceed 7.5 mg daily. A major limitation facing the Egyptian health system is the socioeconomic status and limited insurance coverage. Hence, the use of conventional immunosuppression is usually exhausted before considering biologic therapy, and the role of biosimilars is emphasized to their relatively lower cost, similar efficacy, and safety in comparison to the original molecule.

CONCLUSION

This guideline provides direction for rheumatologists and ophthalmologists making decisions on management of adults with non-infectious uveitis. Putting into consideration that clinical practice varies based on local pharmaceutical availability and patient demographics.

Systemic Administration of Acazicolcept, a Dual CD28 and Inducible T cell Costimulator Inhibitor, Ameliorates Experimental Autoimmune Uveitis

Purpose

Combined inhibition of CD28 and inducible T cell costimulator (ICOS) pathways with acazicolcept (ALPN-101) represents a potential new treatment for uveitis. Here, we evaluate preclinical efficacy using experimental autoimmune uveitis (EAU) in Lewis rats.

Methods

Efficacy was tested in 57 Lewis rats treated with either systemic (subcutaneous) or local (intravitreal) administration of acazicolcept and compared to treatment with a matched Fc-only control or corticosteroid. Impact of treatment on uveitis was assessed using clinical scoring, optical coherence tomography (OCT), and histology. Ocular effector T cell populations were determined using flow cytometry, and multiplex ELISA used to measure aqueous cytokine concentrations.

Results

When compared to Fc control treatment, systemic acazicolcept led to statistically significant decreases in clinical score (P < 0.01), histologic score (P < 0.05), and number of ocular CD45+ cells (P < 0.01). Number of ocular CD4+ and CD8+ T cells expressing IL-17A+ and IFNγ+ were also decreased with statistical significance (P < 0.01). Similar results were achieved with corticosteroids. Intravitreal acazicolcept decreased inflammation scores when compared to untreated fellow eyes and to Fc control treated eyes, although not statistically significant. Systemic toxicity, measured by weight loss, occurred in the corticosteroid-treated, but not in the acazicolcept-treated animals.

Conclusions

Systemic treatment with acazicolcept statistically significantly suppressed EAU. Acazicolcept was well-tolerated without the weight loss associated with corticosteroids. Acazicolcept may be an effective alternative to corticosteroids for use in treating autoimmune uveitis. Additional studies are needed to clarify the optimal dose and route for use in humans.

Translational Relevance

We show that T cell costimulatory blockade could be an effective mechanism for treating uveitis.

The efficacy and safety of TNF inhibitor (golimumab) as salvage treatment in patients with refractory noninfectious uveitis

BACKGROUND

Tumor necrosis factor inhibitor (TNFi) is recently reported to treat noninfectious uveitis (NIU) effectively. However, as a new kind of TNFi, golimumab is just on the market in China for several years, and its administration for NIU treatment lacks sufficient evidence. Therefore, the current study aimed to investigate the efficacy and safety of golimumab in refractory NIU patients.

METHODS

Thirty NIU patients with 49 affected eyes refractory to conventional treatments (corticosteroids and immunosuppressive agents) were consecutively enrolled. They received treatment of TNFi (50 mg golimumab every 4 weeks) for at least 6 months. The anterior chamber cell grade, vitreous haziness grade, central macular thickness, and visual acuity were evaluated at baseline, month (M) 1, M3, and M6.

RESULTS

After treatment, the anterior chamber cell grade declined from baseline (0.6 ± 0.7) to M6 (0.3 ± 0.5) (P < 0.001); the vitreous haziness grade decreased from baseline (1.2 ± 1.2) to M6 (0.4 ± 0.5) (P < 0.001); meanwhile, the central macular thickness also reduced from baseline (351.4 ± 90.8 μm) to M6 (271.8 ± 54.4 μm) (P < 0.001). In terms of visual acuity (LogMAR), it showed a declined trend from baseline (0.5 ± 0.3) to M6 (0.4 ± 0.2), but without statistical significance (P = 0.096). Subgroup analyses revealed that TNFi history related to decreased golimumab efficacy. In addition, 13.3% of patients had adverse events, including elevated liver enzymes (6.7%), fatigue (3.3%), and rash (3.3%).

CONCLUSION

Golimumab is effective and safe for refractory NIU treatment, while a large-scale trial is still needed for verification.

Vogt-Koyanagi-Harada disease: the step-by-step approach to a better understanding of clinicopathology, immunopathology, diagnosis, and management: a brief review

BACKGROUND

Appraisals of Vogt-Koyanagi-Harada disease (VKH) have become progressively more complete, since its first description in 1906. The availability of new investigational methods has improved our knowledge of the immunopathology, clinicopathology, diagnosis, and management of VKH disease. This review aimed to describe some of the steps that led to better characterization of VKH as a clinical entity.

METHODS

We searched on PubMed for articles that described the history of VKH disease and analyzed the progress in disease appraisal with new investigational and imaging methods. In particular, we searched for articles that investigated the clinicopathology, diagnosis, and management of VKH.

FINDINGS

The following developments were considered essential for improving the appraisal and understanding of VKH: (1) the history of the disease, (2) immunopathological mechanisms, (3) clinicopathology, (4) the importance of distinguishing initial-onset from chronic disease, (5) relevant imaging modalities, among which indocyanine green angiography is crucial, (6) diagnostic criteria that facilitate early diagnosis, and (7) the need for early, prolonged, aggressive treatment that combines steroidal and non-steroidal immunosuppression.

CONCLUSION

Based on these findings, the definition of VKH has improved. VKH disease starts in the choroidal stroma and later involves other structures when it is not diagnosed and treated early. Indocyanine green angiography and enhanced depth imaging optical coherence tomography facilitate early diagnosis and precise monitoring of choroidal inflammation. ICGA is clearly the gold standard for appraisals and follow-ups in VKH disease, however EDI-OCT should be especially considered in those areas where ICGA is not fully available. These modalities have contributed substantially to a "cure" for VKH, when treatment is introduced within the therapeutic window of opportunity.

Mechanisms, Pathophysiology and Current Immunomodulatory/Immunosuppressive Therapy of Non-Infectious and/or Immune-Mediated Choroiditis

Non-infectious choroiditis comprises immune-mediated diseases resulting from diverse pathophysiological mechanisms. These conditions are sub-divided into two main groups, (1) diseases of the choriocapillaris and (2) diseases of the choroidal stroma. The purpose of this study is to expose the pathophysiology of the most common diseases of both these groups and recommend the optimal immunomodulatory/immunosuppressive therapy of each analyzed condition based on literature data and data from our own centers. Material and Methods: Narrative review. In the group of choriocapillaritis entities or primary inflammatory choriocapillaropathies (PICCPs) including multiple evanescent white dot syndrome (MEWDS), acute posterior multifocal placoid pigment epitheliopathy (APMPPE), idiopathic multifocal choroiditis (MFC) and serpiginous choroiditis (SC), as well as secondary choriocapillaritides including acute syphilitic posterior multifocal placoid chorioretinitis (ASPMPC) and tuberculosis-related SC (TB-SC), were analyzed. In the group of stromal choroidites, HLA-A29 birdshot retinochoroiditis (BRC) and Vogt-Koyanagi-Harada (VKH) disease were included. For each entity a literature search, in the PubMed database, on treatment was performed and analyzed and the therapeutic attitudes of our own centers were presented. Management of immune-mediated choroiditis implies vigorous immunosuppressive therapy given in a prompt and prolonged fashion in most of these entities.

miRNA Landscape in Pathogenesis and Treatment of Vogt-Koyanagi-Harada Disease

miRNAs, one of the members of the noncoding RNA family, are regulators of gene expression in inflammatory and autoimmune diseases. Changes in miRNA pool expression have been associated with differentiation of CD4⁺ T cells toward an inflammatory phenotype and with loss of self-tolerance in autoimmune diseases. Vogt–Koyanagi–Harada (VKH) disease is a chronic multisystemic pathology, affecting the uvea, inner ear, central nervous system, and skin. Several lines of evidence support an autoimmune etiology for VKH, with loss of tolerance against retinal pigmented epithelium-related self-antigens. This deleterious reaction is characterized by exacerbated inflammation, due to an aberrant T_H1 and T_H17 polarization and secretion of their proinflammatory hallmark cytokines interleukin 6 (IL-6), IL-17, interferon γ, and tumor necrosis factor α, and an impaired CD4⁺ CD25^high FoxP3⁺ regulatory T cell function. To restrain inflammation, VKH is pharmacologically treated with corticosteroids and immunosuppressive drugs as first and second line of therapy, respectively. Changes in the expression of miRNAs related to immunoregulatory pathways have been associated with VKH development, whereas some genetic variants of miRNAs have been found to be risk modifiers of VKH. Furthermore, the drugs commonly used in VKH treatment have great influence on miRNA expression, including those miRNAs associated to VKH disease. This relationship between response to therapy and miRNA regulation suggests that these small noncoding molecules might be therapeutic targets for the development of more effective and specific pharmacological therapy for VKH. In this review, we discuss the latest evidence regarding regulation and alteration of miRNA associated with VKH disease and its treatment.