Adalimumab in Active and Inactive, Non-Infectious Uveitis: Global Results from the VISUAL I and VISUAL II Trials.

PURPOSE: Report global adalimumab safety and efficacy outcomes in patients with non-infectious uveitis. METHODS: Adults with non-infectious intermediate, posterior, or panuveitis were randomized 1:1 to receive placebo or adalimumab in the VISUAL I (active uveitis) or VISUAL II (inactive uveitis) trials. Integrated global and Japan substudy results are reported. The primary endpoint was time to treatment failure (TF). RESULTS: In the integrated studies, TF risk was significantly reduced (hazard ratio [95% CI]) with adalimumab versus placebo (VISUAL I: HR = 0.56 [0.40-0.76], p < 0.001; VISUAL II: HR = 0.52 [0.37-0.74], p < 0.001). In Japan substudies, no consistent trends were observed between groups (VISUAL I: HR = 1.20 [0.41-3.54]; VISUAL II: HR = 0.45 [0.20-1.03]). Adverse event rates were similar between treatment groups in both studies (854 to 1063 events/100 participant-years). CONCLUSIONS: Adalimumab lowered time to TF versus placebo in the integrated population; no consistent trends were observed in Japan substudies. Safety results were consistent between studies.

Safety and Efficacy of Adalimumab in Patients with Noninfectious Uveitis in an Ongoing Open-Label Study: VISUAL III.

PURPOSE: To evaluate safety and efficacy of adalimumab in patients with noninfectious intermediate, posterior, or panuveitis. DESIGN: Phase 3, open-label, multicenter clinical trial extension (VISUAL III). PARTICIPANTS: Adults meeting treatment failure (TF) criteria or who completed VISUAL I or II (phase 3, randomized, double-masked, placebo-controlled) without TF. METHODS: Patients received adalimumab 40 mg every other week. Interim follow-up data were described from VISUAL III weeks 0 through 78. MAIN OUTCOME MEASURES: Disease quiescence, steroid-free quiescence, active inflammatory chorioretinal/retinal vascular lesions, anterior chamber cell grade, vitreous haze grade, best-corrected visual acuity (BCVA), and corticosteroid dose. Binary data were reported using nonresponder imputation (NRI), continuous data using last observation carried forward and as-observed analysis, and corticosteroid dose using observed-case analysis. Adverse events (AEs) were reported from first adalimumab dose in VISUAL III through interim cutoff. RESULTS: Of 424 patients enrolled, 371 were included in intent-to-treat analysis. At study entry, 242 of 371 (65%) patients had active uveitis; 60% (145/242, NRI) achieved quiescence at week 78, and 66% (95/143, as-observed) of those were corticosteroid free. At study entry, 129 of 371 (35%) patients had inactive uveitis; 74% (96/129, NRI) achieved quiescence at week 78, and 93% (89/96, as-observed) of those were corticosteroid free. Inflammatory lesions, anterior chamber grade, and vitreous haze grade showed initial improvement followed by decline in patients with active uveitis and remained stable in patients with inactive uveitis. BCVA improved in patients with active uveitis from weeks 0 to 78 (0.27 to 0.14 logMAR; left and right eyes; as-observed) and remained stable in patients with inactive uveitis. Mean corticosteroid dose decreased from 13.6 mg/day (week 0) to 2.6 mg/day (week 78) in patients with active uveitis and remained stable in those with inactive uveitis (1.5-1.2 mg/day). AEs (424 events/100 patient-years) and serious AEs (16.5 events/100 patient-years) were comparable with previous VISUAL trials. CONCLUSIONS: Patients with active uveitis at study entry who received adalimumab therapy were likely to achieve quiescence, improve visual acuity, and reduce their daily uveitis-related systemic corticosteroid use. Most patients with inactive uveitis at study entry sustained quiescence without a systemic corticosteroid dose increase. No new safety signals were identified.

Prevalence and Incidence of Optic Neuritis in Patients with Different Types of Uveitis.

PURPOSE: This database study aims to investigate the incidence and prevalence of optic neuritis (ON) among patients with different types of uveitis. METHODS: A retrospective analysis of the Truven Health MarketScan® database from 2000 to 2014 was conducted. Patients with uveitis were followed until diagnosis of ON or until they were censored. Diagnosis of uveitis and demyelinating diseases of the central nervous system (DD) including ON were based on ICD-9 codes. Patients with a diagnosis of DD at or before the index date of diagnosis of uveitis were excluded from incidence calculation. In the prevalence analysis, any diagnoses of DD during continuous enrollment were counted. RESULTS: Among the 103,867 uveitis patients, 974 had ever been diagnosed with ON and 2121 with DD including ON during the continuous enrollment. Prevalence rates of ON in patients with intermediate, posterior and pan uveitis are approximately 2.0-2.5% while a lower prevalence (0.6%) of ON was observed in anterior uveitis. During a median follow-up period of 2.2 years, 463 new cases of ON were diagnosed. The incidence rates of ON per 100 person-years (95% CI) were 0.12 (0.11-0.13), 0.28 (0.18-0.41), 0.29 (0.23-0.35) and 0.38 (0.24-0.56), respectively, for anterior, intermediate, posterior and pan uveitis. CONCLUSION: Incidence and prevalence of ON among patients with intermediate, posterior and pan uveitis were comparable and higher than the rates in patients with anterior uveitis.

Corticosteroid-Related Adverse Events Systematically Increase with Corticosteroid Dose in Noninfectious Intermediate, Posterior, or Panuveitis: Post Hoc Analyses from the VISUAL-1 and VISUAL-2 Trials.

PURPOSE: Chronic use of corticosteroids for the treatment of uveitis has been linked with drug-associated toxicity and adverse events (AEs). This study examines the association between corticosteroid dosage and incidence rates of corticosteroid-related AEs. DESIGN: A post hoc analysis of the VISUAL-1 and VISUAL-2 placebo-controlled clinical trials. PARTICIPANTS: The clinical trials consisted of adults with active (VISUAL-1) and inactive (VISUAL-2) noninfectious intermediate, posterior, and panuveitis. Patients were randomized to receive adalimumab or placebo and underwent a protocol-defined mandatory taper to discontinue their oral corticosteroids. METHODS: Adverse event data were collected at each visit and included an assessment of the corticosteroid relationship by the investigator. A longitudinal Poisson regression model was estimated controlling for time-dependent corticosteroid dose, age, sex, prior oral corticosteroid dose, prior topical corticosteroid use, and concomitant immunosuppressive drug use. Only patients randomized to placebo were considered. MAIN OUTCOME MEASURES: The primary outcome measure was the frequency of AEs. RESULTS: The incidence rates of corticosteroid-related AEs among placebo patients during the prednisone treatment period in VISUAL-1 was statistically higher than after discontinuation (454.2 per 100 patient-years [PY] vs. 36.1 per 100 PY, incident rate ratio = 12.6, P < 0.001). Incidence rate ratios among VISUAL-2 patients were similarly high (317.5 per 100 PY vs. 41.1 per 100 PY, incident rate ratio = 7.7, P < 0.001). Based on the Poisson multivariate longitudinal Generalized Estimating Equation (GEE) model, each 10 mg increase in prednisone dose is associated with a 1.5- and 2.6-fold increase (P < 0.001 and P < 0.001) in the rate of corticosteroid-related AEs in VISUAL-1 and VISUAL-2, respectively. This implies in turn that a patient with active uveitis taking 60 mg/day of prednisone will experience, on average, an additional 10.1 (95% confidence interval (CI), 6.3-14.5; P < 0.001) corticosteroid-related AEs per year compared with a patient taking 10 mg/day, whereas a patient with inactive uveitis taking 35 mg/day of prednisone will experience, on average, an additional 23.5 (95% CI, 7.6-52.7; P = 0.05) corticosteroid-related AEs per year compared with a patient taking 10 mg/day. CONCLUSIONS: Evidence from VISUAL-1 and VISUAL-2 suggests that the incidence rates of corticosteroid-related AEs increase systematically with corticosteroid dose.

Effect of Adalimumab on Visual Functioning in Patients With Noninfectious Intermediate Uveitis, Posterior Uveitis, and Panuveitis in the VISUAL-1 and VISUAL-2 Trials.

Importance: Adalimumab was recently approved for the treatment of noninfectious intermediate uveitis, posterior uveitis, and panuveitis. Objective: To assess the effect of adalimumab on the visual functioning and quality of life in patients with corticosteroid-dependent noninfectious intermediate uveitis, posterior uveitis, and panuveitis. Design: A post hoc analysis of clinical trials of adults with active (VISUAL-1) and inactive (VISUAL-2) noninfectious intermediate uveitis, posterior uveitis, and panuveitis was conducted in the United States, Canada, Europe, Israel, Australia, Latin America, and Japan. A total of 217 patients (110 adalimumab, 107 placebo) in VISUAL-1 and 226 patients (115 adalimumab, 111 placebo) in VISUAL-2 were studied using intent-to-treat analyses. The clinical trials were conducted between August 10, 2010, and May 14, 2015. Interventions: In VISUAL-1 and VISUAL-2, patients were randomized to receive adalimumab, 80-mg, subcutaneous loading dose followed by 40 mg every other week or placebo for 80 weeks. All patients underwent prednisone tapering, with patients in VISUAL-1 receiving an initial prednisone burst. Main Outcomes and Measures: The 25-item National Eye Institute Vision Function Questionnaire (NEI VFQ-25) composite score questionnaire assessed the impact of visual impairment from the patient's perspective; scores on the questionnaire range from 0 to 100, with higher scores indicating better vision-related quality of life. The change in NEI VFQ-25 from best state achieved prior to week 6 (VISUAL-1) and from baseline state (VISUAL-2) to the final or early termination visit was determined in each group and statistically compared using analysis of variance. The temporal effects of adalimumab and placebo on NEI VFQ-25 were investigated using a longitudinal model. Results: Of the 217 patients in VISUAL-1, 124 (57.1%) were women; the mean (SD) age was 42.7 (14.9) years. Of the 226 patients in VISUAL-2, 138 (61.1%) were women; the mean (SD) age was 42.5 (13.4). In VISUAL-1, the change from final score to best score in NEI VFQ-25 was -1.30 for adalimumab and -5.50 for placebo-a difference of 4.20 (95% CI, 1.04 to 7.36; P = .01) associated with adalimumab compared with placebo. In VISUAL-2, the change from baseline NEI VFQ-25 was 3.36 for adalimumab and 1.24 for placebo-a difference of 2.12 (95% CI, -0.81 to 5.04; P = .16). In both trials, the longitudinal models showed a significant difference in NEI VFQ-25 between adalimumab and placebo of 3.07 (95% CI, 2.09 to 4.06; P < .001) and 4.66 (95% CI, 0.05 to 9.26; P = .048) in the VISUAL-1 (74.15 vs 71.08) and VISUAL-2 (82.39 vs 77.73) trials, respectively. Conclusions and Relevance: This post hoc analysis suggests that adalimumab is associated with statistically significant and clinically meaningful improvements in patient-reported visual functioning for patients with noninfectious intermediate uveitis, posterior uveitis, and panuveitis. Trial Registration: clinicaltrials.gov Identifiers: NCT01138657 (VISUAL-1) and NCT01124838 (VISUAL-2).

Adalimumab in Patients with Active Noninfectious Uveitis.

BACKGROUND: Patients with noninfectious uveitis are at risk for long-term complications of uncontrolled inflammation, as well as for the adverse effects of long-term glucocorticoid therapy. We conducted a trial to assess the efficacy and safety of adalimumab as a glucocorticoid-sparing agent for the treatment of noninfectious uveitis. METHODS: This multinational phase 3 trial involved adults who had active noninfectious intermediate uveitis, posterior uveitis, or panuveitis despite having received prednisone treatment for 2 or more weeks. Investigators and patients were unaware of the study-group assignments. Patients were randomly assigned in a 1:1 ratio to receive adalimumab (a loading dose of 80 mg followed by a dose of 40 mg every 2 weeks) or matched placebo. All patients received a mandatory prednisone burst followed by tapering of prednisone over the course of 15 weeks. The primary efficacy end point was the time to treatment failure occurring at or after week 6. Treatment failure was a multicomponent outcome that was based on assessment of new inflammatory lesions, best corrected visual acuity, anterior chamber cell grade, and vitreous haze grade. Nine ranked secondary efficacy end points were assessed, and adverse events were reported. RESULTS: The median time to treatment failure was 24 weeks in the adalimumab group and 13 weeks in the placebo group. Among the 217 patients in the intention-to-treat population, those receiving adalimumab were less likely than those in the placebo group to have treatment failure (hazard ratio, 0.50; 95% confidence interval, 0.36 to 0.70; P<0.001). Outcomes with regard to three secondary end points (change in anterior chamber cell grade, change in vitreous haze grade, and change in best corrected visual acuity) were significantly better in the adalimumab group than in the placebo group. Adverse events and serious adverse events were reported more frequently among patients who received adalimumab (1052.4 vs. 971.7 adverse events and 28.8 vs. 13.6 serious adverse events per 100 person-years). CONCLUSIONS: In our trial, adalimumab was found to be associated with a lower risk of uveitic flare or visual impairment and with more adverse events and serious adverse events than was placebo. (Funded by AbbVie; VISUAL I ClinicalTrials.gov number, NCT01138657 .).

Prevalence of Noninfectious Uveitis in the United States: A Claims-Based Analysis.

IMPORTANCE: Noninfectious uveitis (NIU) is a collection of intraocular inflammatory disorders that may be associated with significant visual impairment. To our knowledge, few studies have investigated NIU prevalence overall or stratified by inflammation location, severity, presence of systemic conditions, age, or sex. OBJECTIVE: To estimate NIU prevalence using a large, retrospective, administrative claims database. DESIGN, SETTING, AND PARTICIPANTS: This analysis used the OptumHealth Reporting and Insights database to estimate 2012 NIU prevalence. Analysis was conducted in September 2016. The large administrative insurance claims database includes 14 million privately insured individuals in 69 self-insured companies spanning diverse industries. Included in the study were patients with NIU with 2 or more uveitis diagnoses on separate days in 2012 and continuous enrollment in a health plan for all of 2012 and categorized by inflammation site. MAIN OUTCOMES AND MEASURES: We estimated overall NIU prevalence by inflammation site, severity, sex, and age. Patients with anterior NIU were categorized by the presence of systemic conditions. RESULTS: Of the approximately 4 million eligible adult patients, approximately 2.1 million were women, and of the 932 260 children, 475 481 were boys. The adult prevalence of NIU was 121 cases per 100 000 persons (95% CI, 117.5-124.3). The pediatric NIU prevalence was 29 cases per 100 000 (95% CI, 26.1-33.2). Anterior NIU accounted for 81% (3904 cases) of adult NIU cases (98 per 100 000; 95% CI, 94.7-100.9) and 75% (207 cases) of pediatric NIU cases (22 per 100 000; 95% CI, 19.3-25.4). The prevalences of noninfectious intermediate, posterior, and panuveitis were, for adults, 1 (95% CI, 0.8-1.5), 10 (95% CI, 9.4-11.5), and 12 (95% CI, 10.6-12.7) per 100 000, respectively, and for pediatric patients, 0 (95% CI, 0.1-1.1), 3 (95% CI, 1.8-4.1), and 4 (95% CI, 2.9-5.6) per 100 000, respectively. The prevalence of NIU increased with age and was higher among adult females than males. Application of these estimates to the US population suggests that NIU affected approximately 298 801 American adults (95% CI, 290 512-307 324) and 21 879 children (95% CI, 19 360-24 626) in 2015. CONCLUSIONS AND RELEVANCE: The estimated prevalence of NIU was 121 cases per 100 000 for adults (95% CI, 117.5-124.3) and 29 per 100 000 for children (95% CI, 26.1-33.2). Prevalence was estimated using administrative claims from a commercially insured population, which may have a different prevalence than other segments of the US population. A better understanding of the prevalence of NIU will help to determine the number of patients affected.

Adalimumab for prevention of uveitic flare in patients with inactive non-infectious uveitis controlled by corticosteroids (VISUAL II): a multicentre, double-masked, randomised, placebo-controlled phase 3 trial.

BACKGROUND: Non-infectious uveitis is a potentially sight-threatening ocular disorder caused by chronic inflammation and its complications. Therapeutic success is limited by systemic adverse effects associated with long-term corticosteroid and immunomodulator use if topical medication is not sufficient to control the inflammation. We aimed to assess the efficacy and safety of adalimumab in patients with inactive, non-infectious uveitis controlled by systemic corticosteroids. METHODS: We did this multicentre, double-masked, randomised, placebo-controlled phase 3 trial at 62 study sites in 21 countries in the USA, Canada, Europe, Israel, Australia, and Latin America. Patients (aged ≥18 years) with inactive, non-infectious intermediate, posterior, or panuveitic uveitis controlled by 10-35 mg/day of prednisone were randomly assigned (1:1), via an interactive voice and web response system with a block size of four, to receive either subcutaneous adalimumab (loading dose 80 mg; biweekly dose 40 mg) or placebo, with a mandatory prednisone taper from week 2. Randomisation was stratified by baseline immunosuppressant treatment. Sponsor personnel with direct oversight of the conduct and management of the study, investigators, study site personnel, and patients were masked to treatment allocation. The primary efficacy endpoint was time to treatment failure, a multicomponent endpoint encompassing new active inflammatory chorioretinal or inflammatory retinal vascular lesions, anterior chamber cell grade, vitreous haze grade, and visual acuity. Analysis was done in the intention-to-treat population. This trial is registered with ClinicalTrials.gov number NCT01124838. FINDINGS: Between Aug 10, 2010, and May 14, 2015, we randomly assigned 229 patients to receive placebo (n=114) or adalimumab (n=115); 226 patients comprised the intention-to-treat population. Median follow-up time was 155 days (IQR 77-357) in the placebo group and 245 days (119-564) in the adalimumab group. Treatment failure occurred in 61 (55%) of 111 patients in the placebo group compared with 45 (39%) of 115 patients in the adalimumab group. Time to treatment failure was significantly improved in the adalimumab group compared with the placebo group (median not estimated [>18 months] vs 8·3 months; hazard ratio 0·57, 95% CI 0·39-0·84; p=0·004). The 40th percentile for time to treatment failure was 4·8 months in the placebo group and 10·2 months in the adalimumab group. No patients in either group had opportunistic infections (excluding oral candidiasis and tuberculosis). No malignancies were reported in the placebo group whereas one (1%) patient in the adalimumab group reported non-serious squamous cell carcinoma. The most common adverse events were arthralgia (12 [11%] patients in the placebo group and 27 [23%] patients in the adalimumab group), nasopharyngitis (16 [17%] and eight [16%] patients, respectively), and headache (17 [15%] patients in each group). INTERPRETATION: Adalimumab significantly lowered the risk of uveitic flare or loss of visual acuity upon corticosteroid withdrawal in patients with inactive, non-infectious intermediate, posterior, or panuveitic uveitis controlled by systemic corticosteroids. No new safety signals were observed and the rate of adverse events was similar between groups. These findings suggest that adalimumab is well tolerated and could be an effective treatment option in this patient population. An open-label extension study (NCT01148225) is ongoing to provide long-term safety data for adalimumab in patients with non-infectious uveitis. FUNDING: AbbVie.

Polychromatic angiography for the assessment of VEGF-induced BRB dysfunction in the rabbit retina.

PURPOSE: To determine the utility of polychromatic angiography (PCA) in the assessment of VEGF-induced blood retinal barrier (BRB) dysfunction in rabbits. METHODS: Twenty-six eyes of 24 Dutch Belted rabbits were injected intravitreally with 1.25 µg (group A, n = 5), 10 µg (group C, n = 7), or 4 µg (group B, n = 6; group D, n = 4; and group E, n = 4) of VEGF on day 0. Groups D and E were also injected intravitreally with 1.25 µg and 12.5 µg bevacizumab, respectively, on day 2. On days 0, 2, 4, 7, 11, and 14, PCA was performed using a contrast agent mixture composed of fluorescein sodium, indocyanine green, PCM102, and PCM107 and imaged with a modified fundus camera. PCA scores were based on detected leaking fluorophores. RESULTS: On day 7, there was a statistically significant difference between PCA scores of group A (0.6 ± 0.89) and both groups B (2.67 ± 1.37, P = 0.0154) and C (3.33 ± 0.52, P = 0.00085). There was also a statistically significant difference between groups B and E (PCA score 0.75 ± 0.96, P = 0.032) on day 7. On day 11, there was statistically significant difference between group C (1.80 ± 1.1) and both groups A (0, P = 0.021) and B (0.33 ± 0.52, P = 0.037). CONCLUSIONS: A differential response to both increasing VEGF dose and administration of bevacizumab could be discerned using the PCA. PCA allowed stratification of VEGF-induced BRB dysfunction and inhibitory effects of bevacizumab therapy in the rabbit retina.

Electroretinography and microperimetry as noninvasive diagnostic tools for cilioretinal artery occlusion.

PURPOSE: To report a case of cilioretinal artery occlusion with normal fluorescein angiography findings that was evaluated by electroretinography (ERG) and microperimetry. METHODS: A 64-year-old-man presented with an oval paracentral scotoma in the temporal field of the left eye that became more evident after cataract surgery. Fundus photography, fluorescein angiography, ERG, multifocal ERG, and microperimetry were performed. RESULTS: Multifocal ERG showed decreased signal amplitudes in areas corresponding to areas with a visual defect as detected by microperimetry. Pattern ERG also showed a defect in the P50 component. Findings of fundus photography, fluorescein angiography, and full-field ERG were within normal limits. CONCLUSION: This case demonstrates the possibility of using ERG and microperimetry as noninvasive tools in the diagnosis of cilioretinal artery occlusion.

Functional and structural measurements for the assessment of internal limiting membrane peeling in idiopathic macular pucker.

OBJECTIVE: To investigate the role of structural and functional measurements in the assessment of internal limiting membrane (ILM) peeling for the treatment of eyes with macular pucker. METHODS: Ten patients with macular pucker who underwent pars plana vitrectomy with ILM peeling were studied prospectively. Visual acuity measurement, standard automated achromatic perimetry, multifocal electroretinography (mfERG), and optical coherence tomography (OCT) were performed before and 3 months after surgery. Four surgical samples obtained from similar patients were analyzed with electron microscopy. RESULTS: Three months after surgery, mean visual acuity +/- SD was significantly improved from 0.4 +/- 0.11 logMAR to 0.19 +/- 0.13 logMAR (P < or = 0.002), and mean central retinal thickness +/- SD was significantly decreased 428 +/- 73 microm to 326 +/- 34 microm (P < or = 0.002). The mfERG response amplitudes were slightly decreased in eight patients, and five of these patients also had asymptomatic decreases in visual field sensitivity. The electron micrographs revealed segments of Müller cell footplates on the retinal side of the ILM in all four specimens. CONCLUSION: In this study, the use of mfERG, OCT, and standard automated achromatic perimetry showed changes in macular function and structure postoperatively. These measures of visual function and structure allow for better evaluation of the surgical outcome and understanding of the changes that may occur after ILM peeling.

Measurement of the actual dose of triamcinolone acetonide delivered by common techniques of intravitreal injection.

PURPOSE: To measure the actual dose of triamcinolone acetonide (TA) delivered during intravitreal injection performed by several common techniques. DESIGN: Experimental study. METHODS: A 0.1-ml, 40-mg vial of TA (Kenalog-40; Bristol-Myers-Squibb, Peapack, New Jersey, USA) was prepared according to one of four protocols and the mass determined after drying overnight on waxed paper. In group 1, a 0.1-ml aliquot of TA was dispensed with a 30-gauge needle after shaking the vial 10 or 30 times. Group 2 used a 27-gauge needle. In group 3, the supernatant was removed from the crystals. Group 4 passed the suspension through a 0.2-microm micropore filter and rinsed the crystals with saline. RESULTS: There was no statistically significant difference between 30- or 27-gauge needles (P = 0.83, t test) or between shaking the vial 10 or 30 times before withdrawing the drug (P = 0.99). A statistically significant difference (t test, P = 0.001) was found between TA delivered from the initial 60% of each syringe (mean +/- SD, 2.7 +/- 1.0 mg) to that drawn from the last 40% of each syringe (7.8 +/- 3.6 mg). Group 3 had a mean weight of 32.1 +/- 7.0 mg and group 4, 10.6 +/- 2.1 mg. CONCLUSIONS: Efforts to achieve a 4.0-mg dose of TA, regardless of method used, are variable and inconsistent. Injecting through a small-gauge needle appears to concentrate the remaining suspension. Techniques to concentrate TA or remove aqueous preservatives by filtering effectively increase the concentration, but these results are variable.

Upregulation of RAGE and its ligands in proliferative retinal disease.

We sought to study the presence of the receptor for advanced glycation endproducts (RAGE) and its ligands, advanced glycation endproducts (AGEs), S100/calgranulins and amphoterin (high mobility group box 1 protein; HMGB1), in the vitreous cavity and epiretinal membranes (ERMs) of eyes of patients with proliferative diabetic retinopathy (PDR) and proliferative vitreoretinopathy (PVR). Undiluted vitreous specimens were collected from 30 eyes of 30 patients undergoing pars plana vitrectomy for repair of retinal detachment (RD) secondary to PDR (n = 15) or PVR (n = 15). The vitreous samples obtained from 10 eyes undergoing macular hole repair were used as controls. Epiretinal membranes were obtained from eight eyes with PDR and from 10 eyes with PVR. The levels of AGEs in the vitreous were measured using ELISA. The vitreous levels of soluble RAGE (sRAGE), S100/calgranulins and amphoterin were measured using Western blot analyses. The localization of RAGE and its ligands in ERMs was determined with immunohistochemistry. The vitreous levels of sRAGE were significantly increased in both PDR and PVR (p < or = 0.05) compared to control vitreous. In both PDR and PVR, the vitreous levels of AGEs (p < or = 0.01), S100/calgranulins (p < or = 0.05), and amphoterin (p < or = 0.01) were also elevated compared to control eyes. Expression of RAGE was detected in six of eight ERMs from eyes with PDR and eight of 10 ERMs from eyes with PVR. Many cells expressing RAGE also expressed vimentin, suggesting a glial cell origin. Ligands for RAGE were also detected in ERMs, with AGEs detected in five eyes with PDR and eight eyes with PVR. Similarly, S100 and amphoterin ERM expression was observed in six eyes with PDR; these ligands were also expressed in ERMs from eyes with PVR (8 and 7 cases, respectively). We conclude that RAGE and its ligands are increased in the vitreous cavity of eyes with PDR and PVR and are present in ERMs of eyes with these proliferative retinal disorders. These findings suggest a role for the proinflammatory RAGE axis in the pathogenesis of proliferative retinal diseases.

The RAGE axis in early diabetic retinopathy.

PURPOSE: The receptor for advanced glycation end products (AGEs) has been implicated in the pathogenesis of diabetic complications. This study was conducted to characterize the role of the RAGE axis in a murine model of nonproliferative diabetic retinopathy (NPDR). METHODS: The retinas of hyperglycemic, hyperlipidemic (HGHL, apolipoprotein E(-/-) db/db) mice were examined for the development of early retinal vascular lesions of NPDR and compared to littermates at 6 months of age. Neural function was assessed with electroretinography. Immunohistochemistry, real-time RT-PCR, autofluorescence, and ELISA studies were used to localize and quantify the AGE/RAGE axis. Soluble RAGE, a competitor of cellular RAGE for its ligands, was administered to assess the impact of RAGE blockade. RESULTS: Early inner retinal neuronal dysfunction, manifested by prolonged latencies of the oscillatory potentials and b-wave, was detected in hyperglycemic mice. HGHL mice exhibited accelerated development of acellular capillaries and pericyte ghosts compared with littermate control animals. AGEs were localized primarily to the vitreous cavity and internal limiting membrane (ILM) of the retina, where they were intimately associated with the footplates of RAGE-expressing Müller cells. AGE accumulation measured by ELISA was increased within the retinal extracellular matrix of hyperglycemic mice. AGE fluorescence and upregulation of RAGE transcripts was highest in the retinas of HGHL mice, and attenuation of the RAGE axis with soluble RAGE ameliorated neuronal dysfunction and reduced the development of capillary lesions in these mice. CONCLUSIONS: In early diabetic retinopathy, the RAGE axis, comprising the cellular receptor and its AGE ligands, is amplified within the retina and is accentuated along the vitreoretinal interface. Antagonism of the RAGE axis in NPDR reduces neurovascular perturbations, providing an important therapeutic target for intervention.