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Neutralization of ocular surface TNF-alpha reduces ocular surface and lacrimal gland inflammation induced by in vivo dry eye

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Session Details

Session Title: Cornea Medical

Session Date/Time: Tuesday 16/09/2014 | 14:00-16:00

Paper Time: 14:24

Venue: Capital Hall A

First Author: : H.Lee SOUTH KOREA

Co Author(s): :    Y. Ji   W. Choi           

Abstract Details

Purpose:

The purpose of this study was to investigate the effectiveness of tumor necrosis factor (TNF)-alpha blocker for treatment of dry eye (DE)-induced inflammation and determine a more effective method to suppress lacrimal gland inflammation. Efficacy of topical versus systemic administration of TNF-alpha blockers was determined using a murine dry eye (DE) model.

Setting:

Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea

Methods:

The TNF-alpha blocker HL036 was developed by modification of the TNF receptor I. Protein purity, binding affinity, and clearance of TNF-alpha was compared with etanercept. Using DE-induced C57BL/6 mice, corneal erosion and goblet cell counts were measured after subcutaneous or topical treatment with etanercept or HL036. Inflammatory cytokines in cornea and lacrimal glands were determined by quantitative RT-PCR and ELISA.

Results:

HL036 showed TNF-alpha binding affinity comparable to etanercept, as measured by surface plasmon resonance. HL036 concentration was significantly higher in cornea and anterior segment than etanercept and effectively eliminated TNF-alpha on ocular surfaces. Etanercept was preferentially concentrated in the posterior segment. Corneal erosion and goblet cell counts were improved only with topically applied etanercept and HL036. Ocular surface IFN-gamma, IL-6, and IL-21 were significantly decreased by topical HL036. DE-induced lacrimal gland IFN-gamma and IL-6 expression was effectively suppressed by topical etanercept and HL036.

Conclusions:

Topical TNF-alpha blockers effectively suppressed lacrimal gland and corneal inflammation by suppressing IFN-gamma, IL-21, and IL-6. Differences in TNF-alpha affinity, clearance, and local concentration of blockers may account for the anti-inflammatory effects in different ocular regions.

Financial Interest:

NONE

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