PMID: 9538881Apr 16, 1998Paper

Immunologic phenotype of hosts orally immunized with corneal alloantigens

Investigative Ophthalmology & Visual Science
D MaJ Y Niederkorn

Abstract

To evaluate the immunologic phenotype of hosts tolerized by oral administration of corneal alloantigens. CB6F1 mice were tolerized by oral administration of allogeneic C3H/Hej corneal epithelial and endothelial cells before receiving heterotopic C3H/Hej corneal allografts. C3H-specific cytotoxic T-lymphocyte (CTL), delayed-type hypersensitivity (DTH), and mixed-lymphocyte responses were evaluated in orally tolerized and control mice. Cytokine profiles of Peyer's patch cells from orally tolerized mice were determined by enzyme-linked immunosorbent assay and mink lung cell culture bioassay. Oral administration of corneal cells produced a profound inhibition of allospecific CTL, DTH, and mixed-lymphocyte responses. Conjugation with the B subunit of cholera toxin markedly increased the tolerizing activity of corneal endothelial cells, so that a single dose of cholera toxin-conjugated corneal cells inhibited alloimmune responses to the same degree as 10 doses of corneal cells unconjugated with cholera toxin. Peyer's patch cells from orally tolerized mice produced reduced quantities of interferon-gamma and interleukin-2 but produced increased amounts of transforming growth factor-beta and interleukin-10 compared with concentrations i...Continue Reading

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