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Ocular inflammatory effects of intravitreally injected interleukin-2
J R Samples1, R S Boney, J T Rosenbaum
1Department of Ophthalmology, Oregon Health Sciences University, Casey Eye Institute, Portland 97201.
Current Eye Research
|July 1, 1993
Summary
Interleukin-2 (IL-2) can cause intraocular inflammation, specifically anterior uveitis, in rabbits. Cyclosporine A reduced IL-2-induced inflammation, highlighting varied responses to treatments for different uveitis causes.
Area of Science:
- Ophthalmology
- Immunology
- Inflammation Research
Background:
- Interleukin-2 (IL-2) is primarily known as a T lymphocyte growth factor.
- The role of IL-2 in intraocular inflammation remains incompletely understood.
Purpose of the Study:
- To investigate the potential contribution of IL-2 to intraocular inflammation.
- To characterize the inflammatory response induced by intravitreal IL-2 in a rabbit model.
Main Methods:
- Intravitreal injection of recombinant human IL-2 in New Zealand white rabbits.
- Serial slit lamp examinations to assess anterior uveitis.
- Analysis of aqueous humor for protein, prostaglandin E2, and mononuclear cells.
- Administration of intramuscular cyclosporine A to evaluate its therapeutic effect.
Main Results:
- Intravitreal IL-2 induced dose-dependent anterior uveitis, peaking at 5 days post-injection.
- Elevated protein, prostaglandin E2, and mononuclear cells were observed in the aqueous humor.
- The inflammatory kinetics differed from other tested cytokines (IL-1, IL-6, IL-8, TNF).
- Cyclosporine A significantly reduced IL-2-induced protein extravasation but not IL-1-induced inflammation.
Conclusions:
- IL-2 is implicated as a potential contributor to the pathogenesis of uveitis.
- The study demonstrates the heterogeneity of intraocular inflammation, with varied responses to pharmacologic interventions like cyclosporine A.