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in Herpetic Stromal Keratitis
1From the Department of Ophthalmology, University of Essen, Essen, Germany; 2Ophtha-Lab, St. Franziskus Hospital, Münster, Germany; and the 3Department of Ophthalmology, Renmin Hospital of Wuhan University, Wuhan, China.
PURPOSE. Tumor necrosis factor (TNF)-
is a pleiotropic factor that is critical for the development of inflammation. The authors investigated whether topical application of TNF-
-antagonizing molecules, antisense oligonucleotides (ASON), might be an effective way of modifying the course of immune-mediated herpetic stromal keratitis (HSK).
METHODS. ASON targeting TNF-
mRNA were examined for their efficiency in interfering with the production of this cytokine in vitro. In vivo uptake was determined by FITC-labeled ASON. HSV-1 corneally infected mice were injected three times with ASON. Mice from the control groups received unrelated control oligonucleotides (CON) or buffer. The clinical course of HSK, the delayed-type hypersensitivity (DTH) reaction, the uptake of [3H]thymidine from cells derived from the spleen, virus-neutralizing antibody titers in the serum, and viral replication in the infected eyes were determined. The eyes were examined histologically. The corneal TNF-
content was measured by ELISA.
RESULTS. The TNF-
ASON reduced the lymphocytic cytokine expression in vitro. In vivo, the FITC-labeled molecules were detected in the cornea even after 10 days. In the TNF-
ASON mice the incidence of HSK decreased, and the severity of the disease was diminished. The corneal content of TNF-
was reduced, and the number of inflammatory cells was decreased. The other investigated parameters were not significantly altered by TNF-
ASON treatment.
CONCLUSIONS. The data suggest that TNF-
ASON diminishes the release of TNF-
from cultured lymphocytes and from lymphocytes in the HSV-1infected cornea. This topical treatment mitigates the course of HSK, whereas the systemic antiviral effector functions were not impaired.
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