Multiple, spatially distinct T cell epitopes within a pathogenic 123 residue cyanogen bromide peptide of bovine retinal s-antigen.

Abstract:

:We have examined the T cell specificity of a Lewis rat T cell line (R208) specific for a pathogenic, 123 residue cyanogen bromide produced peptide of bovine S-antigen by using two independent sets of overlapping synthetic peptides representing the entire length of the 123 residue fragment. S-antigen, a 48 kDa immunopathogenic photoreceptor cell autoantigen induces T cell mediated experimental autoimmune uveoretinitis (EAU) in experimental animals. Extensive analyses revealed a heterogenous response by the R208 line to the panel of synthetic peptides, proliferating weakly to 4 distinct sites. Unexpectedly, peptides representing sequences (residues 286-297 and 303-320 of bovine S-antigen) known to actively induce the autoimmune pathology were unable to significantly stimulate the R208 line as assessed by proliferation assays. Similarly, attempts to isolate T cells specific for these sequences from the R208 line have proven unsuccessful. However, two sequences, residues 253-269 and 273-289, sufficiently stimulated R208 cells to allow isolation of sub-lines, R208:26 and R208:28, respectively. Neither of these peptides actively induce an autoimmune response. R208:26 does not transfer EAU and R208:28 transfers moderate EAU. As a control, we are able to isolate a pathogenic T cell line (R502) specific for the actively pathogenic sequence, residues 303-320, when this peptide is used as the immunogen. However, the R502 line proliferates to peptides (e.g. 305-322) which do not contain residues 303 and 304 which are critical for the active induction of disease. These results show a multiplicity of distinct T cell epitopes within a relatively small region of S-antigen.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Fling SP,Gregerson DS,Obritsch WF,Boyce-Jacino M,Merryman CF,Donoso LA

doi

10.3109/02713689008999429

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

111-7

eissn

0271-3683

issn

1460-2202

journal_volume

9 Suppl

pub_type

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