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(Investigative Ophthalmology and Visual Science. 2001;42:1787-1794.)
© 2001 by The Association for Research in Vision and Ophthalmology, Inc.

TNF-{alpha} and TNF-{alpha} Receptor-1 in the Retina of Normal and Glaucomatous Eyes

Gülgün Tezel1, Lin Ya Li1, Raj V. Patil1,2 and Martin B. Wax1

1 From the Departments of Ophthalmology and Visual Sciences and 2 Molecular Biology and Pharmacology, Washington University School of Medicine, St. Louis, Missouri.

PURPOSE. To determine the expression and localization of tumor necrosis factor (TNF)-{alpha} and TNF-{alpha} receptor-1 in the retina of normal and glaucomatous eyes.

METHODS. Using immunohistochemistry and in situ hybridization, retinal expression and localization of TNF-{alpha} and TNF-{alpha} receptor-1 were studied in retina sections from 20 eyes of donors with glaucoma, and 20 eyes of age-matched normal donors.

RESULTS. According to immunohistochemistry, the intensity of the immunostaining and the number of labeled cells for TNF-{alpha} or its receptor were greater in retina sections of glaucomatous eyes than in control eyes of age-matched normal donors. In situ hybridization showed that mRNA signals for TNF-{alpha} or TNF-{alpha} receptor-1 were similarly more intense in glaucomatous eyes than in age-matched control eyes. Both protein and mRNA of TNF-{alpha} or TNF-{alpha} receptor-1 were predominantly localized to the inner retinal layers. Double-immunofluorescence labeling demonstrated that retinal immunostaining for TNF-{alpha} was predominantly positive in the glial cells, whereas immunostaining for TNF-{alpha} receptor-1 was mainly positive in the retinal ganglion cells.

CONCLUSIONS. Upregulation of TNF-{alpha} and its receptor-1 in glaucomatous retina suggest that TNF-{alpha}–mediated cell death is involved in the neurodegeneration process of glaucoma.




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