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The Journal of Immunology, 2000, 164: 1185-1192.
Copyright © 2000 by The American Association of Immunologists

Analysis of Immunomodulatory Activities of Aqueous Humor from Eyes of Mice with Experimental Autoimmune Uveitis1

Kouichi Ohta*, Barbara Wiggert{dagger}, Satoru Yamagami*, Andrew W. Taylor* and J. Wayne Streilein2,*

* Schepens Eye Research Institute and Department of Ophthalmology, Harvard Medical School, Boston, MA 02114; and {dagger} Laboratory of Retinal and Molecular Biology, National Institutes of Health, Bethesda, MD 20892

Aqueous humor (AqH) contains immunosuppressive factors, especially TGF-ß2, that contribute to the immune privileged status of the anterior chamber. However, this may not be true when the blood-ocular barrier is compromised by ocular inflammation. To determine the immunosuppressive status of AqH from murine eyes afflicted with experimental autoimmune uveitis, B10.A mice were immunized with interphotoreceptor retinoid-binding protein. AqH was collected from eyes of affected mice periodically after immunization and then evaluated for content of TGF-ß, proinflammatory cytokines, and the capacity to suppress anti-CD3-driven T cell proliferation. mRNA expression of selected cytokines in iris and ciliary body from inflamed eyes was analyzed by ribonuclease protection assay. We found that TGF-ß levels were significantly increased in AqH from EAU eyes on days 11, 17, and 28. AqH collected on day 11 (onset of disease) failed to suppress T cell proliferation and contained large amounts of locally produced IL-6 that antagonized TGF-ß. In contrast, AqH collected at 17 days (when ocular inflammation was progressively severe) re-expressed the ability to suppress T cell proliferation, in this case due to high levels of blood-derived TGF-ß1 and eye-derived TGF-ß2 in the absence of IL-6. Thus, during the onset of experimental autoimmune uveitis, the ocular microenvironment loses its immunosuppressive properties due to local production of IL-6. But as inflammation mounts, AqH IL-6 content falls, and the fluid reacquires sufficient TGF-ß eventually to suppress immunogenic inflammation. The paradoxical roles of IL-6 in antagonizing TGF-ß, while promoting TGF-ß accumulation during ocular inflammation, is discussed.




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